Research IndicatorsGraph generated 06 August 2015 using data from PubMed using criteria.
Mouse over the terms for more detail; many indicate links which you can click for dedicated pages about the topic. Tag cloud generated 06 August, 2015 using data from PubMed, MeSH and CancerIndex
Specific Cancers (3)
Data table showing topics related to specific cancers and associated disorders. Scope includes mutations and abnormal protein expression.
Note: list is not exhaustive. Number of papers are based on searches of PubMed (click on topic title for arbitrary criteria used).
OMIM, Johns Hopkin University
Referenced article focusing on the relationship between phenotype and genotype.
International Cancer Genome Consortium.
Summary of gene and mutations by cancer type from ICGC
Cancer Genome Anatomy Project, NCI
COSMIC, Sanger Institute
Somatic mutation information and related details
Search the Epigenomics database and view relevant gene tracks of samples.
Latest Publications: LHCGR (cancer-related)
Lee AW, Tyrer JP, Doherty JA, et al.Evaluating the ovarian cancer gonadotropin hypothesis: a candidate gene study.
Gynecol Oncol. 2015; 136(3):542-8 [PubMed
] Related Publications
OBJECTIVE: Ovarian cancer is a hormone-related disease with a strong genetic basis. However, none of its high-penetrance susceptibility genes and GWAS-identified variants to date are known to be involved in hormonal pathways. Given the hypothesized etiologic role of gonadotropins, an assessment of how variability in genes involved in the gonadotropin signaling pathway impacts disease risk is warranted.
METHODS: Genetic data from 41 ovarian cancer study sites were pooled and unconditional logistic regression was used to evaluate whether any of the 2185 SNPs from 11 gonadotropin signaling pathway genes was associated with ovarian cancer risk. A burden test using the admixture likelihood (AML) method was also used to evaluate gene-level associations.
RESULTS: We did not find any genome-wide significant associations between individual SNPs and ovarian cancer risk. However, there was some suggestion of gene-level associations for four gonadotropin signaling pathway genes: INHBB (p=0.045, mucinous), LHCGR (p=0.046, high-grade serous), GNRH (p=0.041, high-grade serous), and FSHB (p=0.036, overall invasive). There was also suggestive evidence for INHA (p=0.060, overall invasive).
CONCLUSIONS: Ovarian cancer studies have limited sample numbers, thus fewer genome-wide susceptibility alleles, with only modest associations, have been identified relative to breast and prostate cancers. We have evaluated the majority of ovarian cancer studies with biological samples, to our knowledge, leaving no opportunity for replication. Using both our understanding of biology and powerful gene-level tests, we have identified four putative ovarian cancer loci near INHBB, LHCGR, GNRH, and FSHB that warrant a second look if larger sample sizes and denser genotype chips become available.
Xiong S, Wang Q, Liu SV, et al.Effects of luteinizing hormone receptor signaling in prostate cancer cells.
Prostate. 2015; 75(2):141-50 [PubMed
] Related Publications
BACKGROUND: The importance of androgen signaling in prostate cancer (PC) is well described and prostate cancer cells retain the ability to directly synthesize androgens. Luteinizing hormone (LH) can induce expression of steroidogenic enzymes and trigger androgen production, but the regulation of this process is not well-described. Here, we explored the impact of silencing LH receptor (LHR) silencing on androgen synthesis and on several relevant signaling pathways in PC.
METHODS: LHR mRNA and protein expression was evaluated in LNCaP PC cells treated with LHR-siRNA. MTS assay was used to measure the effect of LHR-siRNA on proliferation in LNCaP and 22RV1 PC cells. Treated LNCaP and LAPC-3 cells were also assayed for differences in androgen synthesis and expression of steroidogenic enzymes, PSA, AR, and critical signaling molecules including PKA, ERK1/2, PI3K, AKT2, and HER2.
RESULTS: We confirmed that functional LHR is expressed in both androgen-sensitive and castrate-resistant PC specimens. Treatment with LHR-siRNA effectively silenced LHR gene and protein expression and prevented LH-mediated proliferation and androgen synthesis in prostate cancer cells. LHR silencing also downregulated expression of AR, PSA, PKA, ERK1/2, PI3K, AKT2, and HER2.
CONCLUSION: Collectively, these data demonstrate that silencing LHR expression suppresses androgen synthesis and signaling and the LH-LHR pathway may represent a viable therapeutic strategy in PC.
Aschim EL, Oldenburg J, Kristiansen W, et al.Genetic variations associated with the effect of testicular cancer treatment on gonadal hormones.
Hum Reprod. 2014; 29(12):2844-51 [PubMed
] Related Publications
STUDY QUESTION: Do genetic variations in the testosterone pathway genes modify the effect of treatment on the levels of testosterone and LH in long-term testicular cancer (TC) survivors (TCSs)?
SUMMARY ANSWER: Variations in LH receptor (LHR) and in 5α-reductase II (SRD5A2) genes may modify the effect of TC treatment on testosterone levels, whereas genetic variations in the androgen receptor (AR) may modify the effect on LH levels.
WHAT IS KNOWN ALREADY: TCSs experience variable degrees of long-term reduction in gonadal function after treatment. This variability can in part be explained by treatment intensity, but may also be due to individual variations in genes involved in the function and metabolism of reproductive hormones.
STUDY DESIGN, SIZE, DURATION: Cross-sectional study on testosterone and LH levels in 637 Norwegian TCSs in relation to genetic variants and TC treatment.
PARTICIPANTS/MATERIALS, SETTING, METHODS: The single nucleotide polymorphisms LHR Asn291Ser (rs12470652) and Ser312Asn (rs2293275), as well as SRD5A2 Ala49Thr (rs9282858) and Val89Leu (rs523349) were analyzed by allele-specific PCR. The insertion polymorphism LHR InsLQ (rs4539842) was analyzed by sequencing. The numbers of AR CAG and GGN repeats were determined by capillary electrophoresis. Blood samples were collected 5-21 years after diagnosis (median 11 years) and serum total testosterone and LH were analyzed by commercial immunoassays. The TCSs were divided into four groups according to their treatment; surgery only, radiotherapy and chemotherapy with ≤850 or >850 mg of cisplatin. Polymorphisms presenting P < 0.1 for the interaction term with treatment in an initial two-way analysis of covariance (ANCOVA) were investigated further in two consecutive one-way ANCOVA analyses to elucidate the interaction between treatment and genotype.
MAIN RESULTS AND THE ROLE OF CHANCE: For the whole group of TCSs, there were no significant differences between the hormone levels in homozygotes for the wild type and carriers of at least one polymorphic allele for the investigated polymorphisms. Three of the polymorphisms showed signs of interaction with treatment, i.e. LHR InsLQ, SRD5A2 A49T and the AR CAG repeat. Follow-up analyses revealed three situations where only one of the genotypes of the polymorphism where associated with significantly different hormone levels after surgery compared with after additional cytotoxic treatment: For LHR InsLQ, only the wild-type allele was associated with lower testosterone levels after cisplatin > 850 mg compared with after surgery (24% lower, P < 0.001). For SRD5A2 A49T, testosterone levels were lower after radiotherapy compared with after surgery, but only for the heterozygotes for the polymorphism (39% lower, P = 0.001). In comparison, the testosterone levels were just slightly lower after radiotherapy (6% lower, P = 0.039) or cisplatin ≤ 850 mg (7% lower, P = 0.041), compared with surgery, independent of genotypes. For AR CAG, only the reference length of CAG = 21-22 had significantly higher LH levels after cisplatin ≤ 850 mg compared with after surgery (70% higher, P < 0.001). Independent of genotypes, however, LH levels after cisplatin ≤ 850 mg were only 26% higher than after surgery (P = 0.005).
LIMITATIONS, REASONS FOR CAUTION: Unadjusted P-values are presented. For analysis involving genotypes, the level of statistical significance was adjusted for the total number of polymorphisms tested, n = 7, i.e. to P < 0.007 (0.5/7). The rather weak associations indicate that additional polymorphisms are involved in the modulation.
WIDER IMPLICATIONS OF THE FINDINGS: To our knowledge, this is the first study supporting the notion that polymorphisms may explain at least some of the inter-individual differences in endocrine response to TC treatment. Our findings suggest that individuals with certain genotypes may be more vulnerable to certain treatments. Knowledge on genetic predisposition concerning treatment-related endocrine gonadotoxicity to different treatment regimens may help tailoring TC therapy when possible.
STUDY FUNDING/COMPETING INTERESTS: This study was supported by the Research Council of Norway (Grant No. 160619). There were no competing interests.
Rasoulpour RJ, Terry C, LeBaron MJ, et al.Mode-of-action and human relevance framework analysis for rat Leydig cell tumors associated with sulfoxaflor.
Crit Rev Toxicol. 2014; 44 Suppl 2:25-44 [PubMed
] Related Publications
Sulfoxaflor, a molecule that targets sap-feeding insects, was assessed for carcinogenic potential in groups of 50 Fischer rats fed with diets containing 0, 25, 100, 500 (males), or 750 (females) ppm sulfoxaflor for 2 years according to OECD 453. Sulfoxaflor did not alter the number of rats with Leydig cell tumors (LCTs: 88% of controls and 90-92% in treated groups). The size of LCT was increased at 100 and 500 ppm. The spontaneous incidence of LCT in Fischer rat is 75-100% compared with less than 0.01% in humans. These fundamental interspecies differences in spontaneous incidence of LCT are the result of quantitative and qualitative differences in Leydig cell response to hormonal stimuli. There are nine known modes of actions (MoA) for LCT induction. Analysis sulfoxaflor data suggested a hormone-based dopamine enhancement MoA causing the LCT effect through: 1) increased neuronal dopamine release via specific dopaminergic neuron-based nicotinic acetylcholine receptor (nAChR) agonism, leading to 2) decreased serum prolactin (Prl) levels, 3) downregulation of luteinizing hormone receptor (LHR) gene expression in Leydig cells, 4) transient decreases in serum testosterone, 5) increased serum LH levels, and 6) promotion of LCTs. The analysis suggested that sulfoxaflor promoted LCTs through a subtle stimulation of dopamine release. The MoA for LCT promotion in the carcinogenicity study is considered to have no relevance to humans due to qualitative and quantitative differences between rat and human Leydig cells. Therefore, the Fischer 344 rat LCT promotion associated with lifetime administration of high-dose levels of sulfoxaflor would not pose a cancer hazard to humans.
The etiology of polycystic ovary syndrome (PCOS) has been difficult to determine because its features are heterogeneous, and its origin may also be heterogeneous. Twin studies suggest that its etiology is strongly heritable and genetic approaches are rapidly uncovering new regions of the genome that appear to confer risk for PCOS. Recent genome-wide association studies in Han Chinese women with PCOS demonstrate 11 genetic loci that are associated with PCOS. The variants identified are in regions that contain genes important for gonadotropin action, genes that are associated with risk for type 2 diabetes, and other genes in which the relationship to PCOS is not yet clear. Replication studies have demonstrated that variants at several of these loci also confer risk for PCOS in women of European ethnicity. The strongest loci in Europeans contain genes for DENND1A and THADA, with additional associations in loci containing the LHCGR and FSHR, YAP1 and RAB5/SUOX. The next steps in uncovering the pathophysiology borne out by these loci and variants will include mapping to determine the causal variant and gene, phenotype studies to determine whether these regions are associated with particular features of PCOS and functional studies of the causal variant to determine the direct cause of PCOS based on the underlying genetics. The next years will be very exciting times as groups from around the world come together to further elucidate the genetic origins of PCOS.
BACKGROUND: Modeling high-dimensional data involving thousands of variables is particularly important for gene expression profiling experiments, nevertheless,it remains a challenging task. One of the challenges is to implement an effective method for selecting a small set of relevant genes, buried in high-dimensional irrelevant noises. RELIEF is a popular and widely used approach for feature selection owing to its low computational cost and high accuracy. However, RELIEF based methods suffer from instability, especially in the presence of noisy and/or high-dimensional outliers.
RESULTS: We propose an innovative feature weighting algorithm, called LHR, to select informative genes from highly noisy data. LHR is based on RELIEF for feature weighting using classical margin maximization. The key idea of LHR is to estimate the feature weights through local approximation rather than global measurement, which is typically used in existing methods. The weights obtained by our method are very robust in terms of degradation of noisy features, even those with vast dimensions. To demonstrate the performance of our method, extensive experiments involving classification tests have been carried out on both synthetic and real microarray benchmark datasets by combining the proposed technique with standard classifiers, including the support vector machine (SVM), k-nearest neighbor (KNN), hyperplane k-nearest neighbor (HKNN), linear discriminant analysis (LDA) and naive Bayes (NB).
CONCLUSION: Experiments on both synthetic and real-world datasets demonstrate the superior performance of the proposed feature selection method combined with supervised learning in three aspects: 1) high classification accuracy, 2) excellent robustness to noise and 3) good stability using to various classification algorithms.
Yuri T, Kinoshita Y, Emoto Y, et al.Human chorionic gonadotropin suppresses human breast cancer cell growth directly via p53-mediated mitochondrial apoptotic pathway and indirectly via ovarian steroid secretion.
Anticancer Res. 2014; 34(3):1347-54 [PubMed
] Related Publications
The tumor-suppressive effects of human chorionic gonadotropin (hCG) against human breast cancer cells were examined. In cell viability assays, hCG inhibited the growth of three human breast cancer cell lines (estrogen receptor (ER)-positive KPL-1 and MCF-7, and ER-negative MKL-F cells), and the growth inhibition activity of hCG was most pronounced against KPL-1 cells (luteinizing hormone/chorionic gonadotropin receptor (LHCGR)-positive and luminal-A subtype). In hCG-treated KPL-1 cells, immunoblotting analysis revealed the expression of tumor suppressor protein p53 peaking at 12 h following treatment, followed by cleavage of caspase-9 and caspase-3 at 24 h and 48 h, respectively. KPL-1-transplanted athymic mice were divided into 3 groups: a sham-treated group that received an inoculation of KPL-1 cells at 6 weeks of age followed by daily intraperitoneal (i.p.) injection of saline; an in vitro hCG-treated KPL-1 group that received an inoculation of KPL-1 cells pre-treated with 100 IU/ml hCG in vitro for 48 h at 6 weeks of age, followed by daily i.p. injection of saline; and an in vivo hCG-treated group that received an KPL-1 cell inoculation at 6 weeks of age, followed by daily i.p. injection of 100 IU hCG. The daily injections of saline or hCG continued until the end of the experiment when mice reached 11 weeks of age. KPL-1 tumor growth was retarded in in vitro and in vivo hCG-treated mice compared to sham-treated controls, and the final tumor volume and tumor weight tended to be suppressed in the in vitro hCG-treated group and were significantly suppressed in the in vivo hCG-treated group. In vivo 100-IU hCG injections for 5 weeks elevated serum estradiol levels (35.7 vs. 23.5 pg/ml); thus, the mechanisms of hCG action may be directly coordinated via the p53-mediated mitochondrial apoptotic pathway and indirectly through ovarian steroid secretion that elevates estrogen levels. It is thus concluded that hCG may be an attractive agent for treating human breast cancer expressing both LHCGR and ER.
Bassiouny YA, Rabie WA, Hassan AA, Darwish RKAssociation of the luteinizing hormone/choriogonadotropin receptor gene polymorphism with polycystic ovary syndrome.
Gynecol Endocrinol. 2014; 30(6):428-30 [PubMed
] Related Publications
This study aimed at evaluating possible associations of the single nucleotide polymorphism (SNP) in luteinizing hormone/choriogonadotropin receptor (LHCGR) gene G935A and polycystic ovary syndrome (PCOS) phenotype. The study included 100 PCOS female patients and 60 healthy female control subjects. The patients were recruited from the Gynecology out-patient clinic, Kasr Al-Aini Hospital, Cairo University. All candidates underwent full history taking and clinical examination with calculation of body mass index. Serum and EDTA samples were collected from each patient after a written consent. A hormonal profile was done for each patient as well as DNA analysis of the G935A polymorphism of LHCGR gene. In PCOS group, 26% were homozygous (AA), 27% were heterozygous (GA) and 47% were wild genotype (GG), while in controls 30% were heterozygous and 70% were wild genotype (OR: 2.25; CI: 1.16-4.386; p value: 0.012). The homozygous 935A individuals were at higher risk to develop PCOS than controls (OR: 1.80; CI: 1.54-2.09; p value < 0.001).We found a genetic variant, which is associated with PCOS in a sample of the Egyptian population. These results may provide an opportunity to test this SNP at the LHCGR gene in fertile or infertile women with family history to assess their risk of PCOS.
Wang P, Zhao H, Li T, et al.Hypomethylation of the LH/choriogonadotropin receptor promoter region is a potential mechanism underlying susceptibility to polycystic ovary syndrome.
Endocrinology. 2014; 155(4):1445-52 [PubMed
] Related Publications
Our previous genome-wide association study identified LH/choriogonadotropin receptor (LHCGR) as a susceptibility gene for polycystic ovary syndrome (PCOS). The objective of this study was to determine whether the genetic or epigenetic components associated with LHCGR participate in the pathogenesis of PCOS. The exons and flanking regions of LHCGR were sequenced from 192 women with PCOS, and no novel somatic mutations were identified. In addition, the methylation statuses of 6 cytosine-phosphate-guanine (CpG) sites in the promoter region of LHCGR were measured by pyrosequencing using peripheral blood cells from 85 women with PCOS and 88 control women. We identified 2 hypomethylated sites, CpG -174 (corrected P = .018) and -111 (corrected P = .006). Bisulfite sequencing then was performed to replicate these findings and detect additional CpG sites in the promoter. CpG +17 was significantly hypomethylated in women with PCOS (corrected P = .02). Methylation statuses were further evaluated using granulosa cells (GCs), and the region described was hypomethylated as a whole (P = .004) with 8 significantly hypomethylated sites (CpG -174, -148, -61, -43, -8, +10, +17, and +20). Transcription of LHCGR was elevated in women with PCOS compared with that in control women (P < .01). These findings were consistent with the decreased LHCGR methylation status associated with PCOS. The tendency of LHCGR to be hypomethylated across different tissues and its corresponding expression level suggest that hypomethylation of LHCGR is a potential mechanism underlying susceptibility to PCOS. Further studies are needed to evaluate whether a causal relationship exists between LHCGR methylation status and PCOS.
Louwers YV, Stolk L, Uitterlinden AG, Laven JSCross-ethnic meta-analysis of genetic variants for polycystic ovary syndrome.
J Clin Endocrinol Metab. 2013; 98(12):E2006-12 [PubMed
] Related Publications
CONTEXT: Genome-wide association studies (GWAS) have revealed new susceptibility loci for Chinese patients with polycystic ovary syndrome (PCOS). Because ethnic background adds to phenotypic diversities in PCOS, it seems plausible that genetic variants associated with PCOS act differently in various ethnic populations.
OBJECTIVE: We studied cross-ethnic effects of Chinese PCOS loci (ie, LHCGR, THADA, DENND1A, FSHR, c9orf3, YAP1, RAB5B/SUOX, HMGA2, TOX3, INSR, SUMO1P1) in patients of Northern European descent.
DESIGN: This study was a genetic association study conducted at an University Medical Center.
PATIENTS: Association was studied in 703 Dutch PCOS patients and 2164 Dutch controls. To assess the cross-ethnic effect, we performed a meta-analysis of the Dutch data combined with results of previously published studies in PCOS patients from China (n = 2254) and the United States (n = 2618). Adjusted for multiple testing, a P value <3.1 × 10⁻³ was considered statistically significant.
RESULTS: Meta-analysis of the Chinese, US, and Dutch data resulted in 12 significant variants mapping to the YAP1 (P value = 1.0 × 10⁻⁹), RAB5B/SUOX (P value = 3.8 × 10⁻¹¹), LHCGR (P value = 4.1 × 10⁻⁴), THADA (P value = 2.2 × 10⁻⁴ and P value = 1.3 × 10⁻³), DENND1A (P value = 2.3 × 10⁻³ and P value = 2.5 × 10⁻³), FSHR (P value = 3.8 × 10⁻⁵ and P value = 3.6 × 10⁻⁴), c9orf3 (P value = 2.0 × 10⁻⁶ and P value = 9.2 × 10⁻⁶), SUMO1P1 (P value = 2.3 × 10⁻³) loci with odds ratios ranging from 1.19 to 1.45 and 0.79 to 0.87.
CONCLUSIONS: Overall, we observed for 12 of 17 genetic variants mapping to the Chinese PCOS loci similar effect size and identical direction in PCOS patients from Northern European ancestry, indicating a common genetic risk profile for PCOS across populations. Therefore, it is expected that large GWAS in PCOS patients from Northern European ancestry will partly identify similar loci as the GWAS in Chinese PCOS patients.
Heublein S, Mayr D, Vrekoussis T, et al.The G-protein coupled estrogen receptor (GPER/GPR30) is a gonadotropin receptor dependent positive prognosticator in ovarian carcinoma patients.
PLoS One. 2013; 8(8):e71791 [PubMed
] Free Access to Full Article Related Publications
Follicle stimulating hormone receptor (FSHR) and luteinizing hormone receptor (LHCGR) were demonstrated to impact upon survival of patients suffering from epithelial ovarian cancer (EOC). Though structure wise the G-protein coupled estrogen receptor (GPER/GPR30) is related to FSHR/LHCGR, its prognostic impact in EOC remains controversial. We recently found that FSHR negative patients represent a specific EOC subgroup that may behave differently in respect to both treatment response and prognosis. Hence, the current study aimed to analyze how GPER may interact with the FSHR/LHCGR system in EOC and whether the prognostic significance of GPER in EOC cases (n=151) may be dependent on the FSHR/LHCGR immunophenotype of the tumor. Ovarian cancer cell lines were used to study how FSH and LH regulate GPER and whether GPER activation differentially affects in vitro cell proliferation in presence/absence of activated FSHR/LHCGR. In EOC tissue, GPER correlated with FSHR/LHCGR and was related to prolonged overall survival only in FSHR/LHCGR negative patients. Although GPER was found to be specifically induced by LH/FSH, GPER agonists (4-Hydroxy-Tamoxifen, G1) reduced EOC cell proliferation only in case of LH/FSH unstimulated pathways. To the same direction, only patients characterized as LHCGR/FSHR negative seem to gain from GPER in terms of survival. Our combined tissue and in vitro results support thus the hypothesis that GPER activation could be of therapeutic benefit in LHCGR/FSHR negative EOC patients. Further studies are needed to evaluate the impact of GPER activation on a clinical scheme.
Huang X, Hao C, Shen X, et al.Differences in the transcriptional profiles of human cumulus cells isolated from MI and MII oocytes of patients with polycystic ovary syndrome.
Reproduction. 2013; 145(6):597-608 [PubMed
] Related Publications
Polycystic ovary syndrome (PCOS) is a common endocrine and metabolic disorder in women. The abnormalities of endocrine and intra-ovarian paracrine interactions may change the microenvironment for oocyte development during the folliculogenesis process and reduce the developmental competence of oocytes in PCOS patients who are suffering from anovulatory infertility and pregnancy loss. In this microenvironment, the cross talk between an oocyte and the surrounding cumulus cells (CCs) is critical for achieving oocyte competence. The aim of our study was to investigate the gene expression profiles of CCs obtained from PCOS patients undergoing IVF cycles in terms of oocyte maturation by using human Genome U133 Plus 2.0 microarrays. A total of 59 genes were differentially expressed in two CC groups. Most of these genes were identified to be involved in one or more of the following pathways: receptor interactions, calcium signaling, metabolism and biosynthesis, focal adhesion, melanogenesis, leukocyte transendothelial migration, Wnt signaling, and type 2 diabetes mellitus. According to the different expression levels in the microarrays and their putative functions, six differentially expressed genes (LHCGR, ANGPTL1, TNIK, GRIN2A, SFRP4, and SOCS3) were selected and analyzed by quantitative RT-PCR (qRT-PCR). The qRT-PCR results were consistent with the microarray data. Moreover, the molecular signatures (LHCGR, TNIK, and SOCS3) were associated with developmental potential from embryo to blastocyst stage and were proposed as biomarkers of embryo viability in PCOS patients. Our results may be clinically important as they offer a new potential strategy for competent oocyte/embryo selection in PCOS patients.
Cui L, Zhao H, Zhang B, et al.Genotype-phenotype correlations of PCOS susceptibility SNPs identified by GWAS in a large cohort of Han Chinese women.
Hum Reprod. 2013; 28(2):538-44 [PubMed
] Related Publications
STUDY QUESTION: Are there any correlations between the phenotypes of polycystic ovary syndrome (PCOS) and the genotypes of the PCOS susceptibility single nucleotide polymorphisms (SNPs) in THADA, DENND1A and LHCGR?
SUMMARY ANSWER: The PCOS susceptibility genes, THADA and DENND1A, carry risk alleles that are associated with endocrine and metabolic disturbances in patients with PCOS.
WHAT IS KNOWN ALREADY: PCOS is a heterogeneous endocrinopathy characterized by oligo-anovulation, hyperandrogenism and polycystic ovaries. In a previous genome-wide association study, the SNP variants rs13429458, rs12478601, rs2479106, rs10818854 and rs13405728 in the THADA, DENND1A and LHCGR genes were identified as being independently associated with PCOS. The aim of this study was to identify any additional correlations between the phenotypes of PCOS and genotypes of the five SNPs described in the previous study.
STUDY DESIGN, SIZE, DURATION: In the present cross-sectional study, a total of 1731 PCOS patients and 4964 controls were enrolled.
PARTICIPANTS/MATERIALS, SETTING, METHODS: Patients were diagnosed according to Rotterdam criteria. Clinical information was collected from the patients and controls. Endocrine and metabolic parameters were evaluated for phenotype-genotype correlation analyses.
MAIN RESULTS AND THE ROLE OF CHANCE: Using a recessive model, the AA group for rs13429458 in THADA was associated with increased luteinizing hormone (LH) (P < 0.01) and testosterone (T) (P = 0.02) levels in subjects with PCOS; the LH/follicle-stimulating hormone ratio was also higher in the AA group (P < 0.01). Also using a recessive model, the CC genotype of rs12478601, also in THADA, was associated with increased levels of low-density lipoprotein (P = 0.02). Using a dominant model, the GG + AG group for rs2479106 in DENND1A was associated with elevated serum insulin levels 2 h after a glucose load in the patients with PCOS (P = 0.02). All of the comparisons were adjusted for age and BMI.
LIMITATIONS, REASONS FOR CAUTION: The relatively younger age of the participants may represent a considerable bias when evaluating metabolic alterations as a function of different genotypes, as significant metabolic disturbances may emerge later in life. Furthermore, the sample sizes of several sub-genotype groups were relatively small; to some extent this limited the statistical power of the analysis.
WIDER IMPLICATIONS OF THE FINDINGS: The PCOS susceptibility genes, THADA and DENND1A, carry risk alleles that are associated with endocrine and metabolic disturbances in PCOS patients of Han Chinese descent. The findings have shown genuine heterogeneity, stratified on the basis of both clinical findings and genotypes. Replication of these results is expected in other ethnic groups.
Mutharasan P, Galdones E, Peñalver Bernabé B, et al.Evidence for chromosome 2p16.3 polycystic ovary syndrome susceptibility locus in affected women of European ancestry.
J Clin Endocrinol Metab. 2013; 98(1):E185-90 [PubMed
] Free Access to Full Article Related Publications
CONTEXT: A previous genome-wide association study in Chinese women with polycystic ovary syndrome (PCOS) identified a region on chromosome 2p16.3 encoding the LH/choriogonadotropin receptor (LHCGR) and FSH receptor (FSHR) genes as a reproducible PCOS susceptibility locus.
OBJECTIVE: The objective of the study was to determine the role of the LHCGR and/or FSHR gene in the etiology of PCOS in women of European ancestry.
DESIGN: This was a genetic association study in a European ancestry cohort of women with PCOS.
SETTING: The study was conducted at an academic medical center.
PARTICIPANTS: Participants in the study included 905 women with PCOS diagnosed by National Institutes of Health criteria and 956 control women.
INTERVENTION: We genotyped 94 haplotype-tagging single-nucleotide polymorphisms and two coding single-nucleotide polymorphisms mapping to the coding region of LHCGR and FSHR plus 20 kb upstream and downstream of the genes and test for association in the case control cohort and for association with nine quantitative traits in the women with PCOS.
RESULTS: We found strong evidence for an association of PCOS with rs7562215 (P = 0.0037) and rs10495960 (P = 0.0046). Although the marker with the strongest association in the Chinese PCOS genome-wide association study (rs13405728) was not informative in the European populations, we identified and genotyped three markers (rs35960650, rs2956355, and rs7562879) within 5 kb of rs13405728. Of these, rs7562879 was nominally associated with PCOS (P = 0.020). The strongest evidence for association mapping to FSHR was observed with rs1922476 (P = 0.0053). Furthermore, markers with the FSHR gene region were associated with FSH levels in women with PCOS.
CONCLUSIONS: Fine mapping of the chromosome 2p16.3 Chinese PCOS susceptibility locus in a European ancestry cohort provides evidence for association with two independent loci and PCOS. The gene products LHCGR and FSHR therefore are likely to be important in the etiology of PCOS, regardless of ethnicity.
Huang G, Coviello AClinical update on screening, diagnosis and management of metabolic disorders and cardiovascular risk factors associated with polycystic ovary syndrome.
Curr Opin Endocrinol Diabetes Obes. 2012; 19(6):512-9 [PubMed
] Related Publications
PURPOSE OF REVIEW: Polycystic ovarian syndrome (PCOS) is the most common endocrinopathy in premenopausal women. This review discusses the screening, diagnosis and management of metabolic disorders and cardiovascular risk factors associated with PCOS, highlighting significant recent developments.
RECENT FINDINGS: PCOS is a complex genetic disorder with multiple susceptibility genes as well as environmental factors influencing the expression of various PCOS phenotypes. The first genome-wide association study of PCOS identified susceptibility loci on chromosome 2 near the luteinizing hormone receptor gene LHCGR and chromosome 9 near the obesity gene DEEND1A. Women with PCOS are affected by a variety of metabolic disorders, including insulin resistance, metabolic syndrome, type-2 diabetes, dyslipidemia and obesity. Recently, it has been established that women with PCOS have a high risk of nonalcoholic fatty liver disease. These metabolic disturbances are associated with an increased risk of cardiovascular disease (CVD). Although women with PCOS have higher rates of cardiovascular risk factors and intermediate markers of CVD, studies definitively documenting increased CVD are lacking.
SUMMARY: The high prevalence of metabolic disorders and CVD risk factors in women with PCOS highlights the need for early screening, diagnosis and treatment of these disorders to promote long-term health and possibly prevent CVD.
BACKGROUND: Glycodelin is a cell surface glycoprotein offering a unique gender specific carbohydrate configuration. Sialylated carbohydrate structures, which are unusual for mammals, characterize Glycodelin isolated from amniotic fluid (Glycodelin A, GdA). Glycodelin in general exerts multiple, partly opposing functions ranging from immunosuppression to cell differentiation. As these markedly influence tumorigenesis, this study aimed to clarify whether expression of different Glycodelin isoforms is related to clinicopathological characteristics and prognosis of ovarian cancer patients. Further the use of Glycodelin as a serum marker in benign and malignant ovarian diseases was evaluated.
METHODS: Ovarian cancer specimens (n = 152) were stained for Glycodelin with carbohydrate and peptide specific antibodies. Associations between Glycodelin expression and histological grading, FIGO stage as well as patient's prognosis were examined. Glycodelin was correlated to expression of gonadotropin receptors and mucin-1, which are discussed as ovarian cancer tissue markers. In addition, Glycodelin serum concentrations were analyzed in patients suffering from benign (n = 73) or malignant (n = 38) ovarian neoplasias.
RESULTS: Glycodelin A was found to be an independent prognostic marker for poor prognosis in advanced ovarian cancer patients. GdA staining correlated with gonadotropin receptor (FSHR and LHCGR) and with hCG expression. Gd expression showed a positive correlation with a tumour-associated epitope of mucin 1 (TA-MUC1). Further, compared to ovarian cancer, serum Gd was increased in patients with benign ovarian tumors.
CONCLUSION: Glycodelin A might be related to tumor aggressiveness and poor clinical outcome in advanced epithelial ovarian cancer. Glycodelin serum levels found in patients suffering from benign ovarian tumors, might contribute to a more global attenuation during progression of these precursor lesions.
Guzman L, Adriaenssens T, Ortega-Hrepich C, et al.Human antral follicles <6 mm: a comparison between in vivo maturation and in vitro maturation in non-hCG primed cycles using cumulus cell gene expression.
Mol Hum Reprod. 2013; 19(1):7-16 [PubMed
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Within the context of an oocyte in vitro maturation (IVM) program for reproductive treatment, oocyte cumulus complexes (COCs) derived from follicles <6 mm in patients with PCOS were matured in vitro. Key transcripts related to meiotic maturation (FSHR, LHCGR, EGFR, PGR) and oocyte competence (AREG, ADAMTS, HAS2, PTGS2) were quantified in cumulus cells (CCs) before and after maturation. Control CC samples were collected from PCOS and normo-ovulatory patients who had undergone conventional gonadotrophin stimulation for IVF/ICSI. Additional control samples from a non-stimulated condition were obtained ex vivo from patients undergoing ovariectomy for fertility preservation. Expression data from CCs from follicles with a diameter of <6 mm before (IVM-CCs) and after in vitro maturation (IVM-CCs) were obtained after pooling CCs into four groups in relation to the percentage of matured (MII) oocytes obtained after 40 h of IVM (0; 40-60; 61-80; 100% MII) and values were compared with in vivo matured controls (IVO-CCs). Genes encoding key receptors mediating meiotic resumption are expressed in human antral follicles of <6 mm before and after IVM. The expression levels of FSHR, EGFR and PGR in CCs were significantly down-regulated in the IVO-CCs groups and in the 100% MII IVM group compared with the BM groups; all the receptors studied in the 100% MII IVM group reached an expression profile similar to that of IVO-CCs. However, after maturation in a conventional IVF/ICSI cycle, IVO-CCs from large follicles contained significantly increased levels of ADAMTS1, AREG, HAS2 and PTGS2 compared with IVM-CCs and IVM-CCs; the expression patterns for these genes in all IVM-CCs were unchanged compared with IVM-CCs. In conclusion, genes encoding receptors involved in oocyte meiotic resumption appeared to be expressed in CCs of small human antral follicles. Expression levels of genes-encoding factors reflecting oocyte competence were significantly altered in IVM-CCs compared with in vivo matured oocytes from large follicles. Observed differences might be explained by the different stimulation protocols, doses of gonadotrophin or by the intrinsic differences between in vivo and in vitro maturation.
Wang Z, Li T, Zhang W, et al.Variants in DENND1A and LHCGR are associated with endometrioid adenocarcinoma.
Gynecol Oncol. 2012; 127(2):403-5 [PubMed
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OBJECTIVE: The aim of this study was to explore the polycystic ovary syndrome (PCOS) related single nucleotide polymorphisms (SNPs) rs13405728 (in gene LHCGR), rs13429458 (in gene THADA) and rs2479106 (in gene DENND1A) in women with endometrial carcinoma.
METHODS: We conducted a case-control study comprising 96 Han Chinese women with endometrial carcinoma, and 192 healthy controls. SNPs rs13405728, rs13429458 and rs2479106 were genotyped by polymerase chain reaction (PCR) and direct sequencing. The effects of body mass index (BMI) and age were evaluated using an unconditional logistic regression model adjusted for potential confounders.
RESULTS: The allele frequencies of SNPs rs2479106 and rs13405728 were significantly different (P<0.05) between endometrial carcinoma group and control group, and the difference was especially significant in the subgroup of endometrioid adenocarcinoma. Genotyping analysis showed that allele G in rs2479106 and allele A in rs13405728 could confer risk to endometrioid adenocarcinoma.
CONCLUSIONS: Our results suggest that SNPs rs2479106 in gene DENND1A and rs13405728 in gene LHCGR are associated with endometrioid adenocarcinoma.
Kristiansen W, Aschim EL, Andersen JM, et al.Variations in testosterone pathway genes and susceptibility to testicular cancer in Norwegian men.
Int J Androl. 2012; 35(6):819-27 [PubMed
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Imbalance between the oestrogen and androgen levels in utero is hypothesized to influence testicular cancer (TC) risk. Thus, variation in genes involved in the action of sex hormones may contribute to variability of an individual's susceptibility to TC. Mutations in testosterone pathway genes may alter the level of testosterone in vivo and hypothetically the risk of developing TC. Luteinizing hormone receptor (LHR), 5α-reductase II (SRD5A2) and androgen receptor (AR) are key elements in androgen action. A case-control study comprising 651 TC cases and 313 controls in a Norwegian population was conducted for investigation of polymorphisms in the LHR, SRD5A and AR genes and their possible association with TC. A statistical significant difference was observed in patients being heterozygous for the LHR Asn312Ser polymorphism when comparing genotypes between all TC cases and controls (OR = 0.66, 95% CI = 0.48-0.89, p(adj) = 0.049). No statistically significant difference between the histological subtypes seminoma and non-seminoma was observed. Our results may suggest a possible association between genetic variation in the LHR gene and the risk of developing TC.
Khan NR, Khan AN, Bashir S, et al.Diagnostic utility of p63 (Ab-1) and (Ab-4) tumor markers in the squamous cell carcinomas of head and neck.
Asian Pac J Cancer Prev. 2012; 13(3):975-8 [PubMed
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P63 is a gene product required in cell cycle regulation which plays vital roles in tumor differentiation. Aims of the present study were to assess the frequency, pattern, sensitivity and specificity of two p63 protein clones P63 4A4 and P63 4A4+Y4A3 in squamous cell carcinomas (SCCs). Thirty cases of head and neck region SCC diagnosed on the basis of HandE staining were examined along with 60 cases of head and neck region biopsies other than squamous cell carcinoma, negative on HandE staining, were taken as control. Immunostaining was performed on slides according to the Thermo Scientific UltraVision LP detection System. P63 4A4+Y4A3 clone is more sensitive 96.6% in comparison to 86% in P63 4A4 with having greater NPV of 98.3%. The results signify the importance of P63 4A4+Y4A3 marker over the old markers and may be used as a confirmatory marker of squamous cell carcinoma.
BACKGROUND: High circulating luteinizing hormone (LH) level is a typical biochemical feature of polycystic ovary syndrome (PCOS) whose pathophysiology is still unclear. Certain mutations of LH and LH receptor (LHR) may lead to changes in bioactivity of these hormones. The aim of this study was determine the role of the LH and LHR polymorphisms in the pathogenesis of PCOS using a genetic approach.
METHODS: 315 PCOS women and 212 controls were screened for the gene variants of LH G1052A and LHR rs61996318 polymorphisms by polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP).
RESULTS: PCOS patients had significantly more A allele frequency of LH G1052A mutations than controls (p=0.001). Within PCOS group, carriers of LH 1052A allele had lower LH (p=0.05) and higher fasting glucose levels (p=0.04). No subjects were identified with LHR rs61996318 polymorphisms. A new LHR single nucleotide polymorphism (SNP) was found without clear association with PCOS.
CONCLUSIONS: Results suggested LH G1052A mutation might influence PCOS susceptibility and phenotypes.
Eriksen MB, Brusgaard K, Andersen M, et al.Association of polycystic ovary syndrome susceptibility single nucleotide polymorphism rs2479106 and PCOS in Caucasian patients with PCOS or hirsutism as referral diagnosis.
Eur J Obstet Gynecol Reprod Biol. 2012; 163(1):39-42 [PubMed
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CONTEXT: Polycystic ovary syndrome (PCOS) is the most common endocrine disease among premenopausal women. A recent study found association between three single nucleotide polymorphisms (SNPs) and PCOS in a cohort of Han Chinese women.
OBJECTIVE: To investigate the association between rs13405728 (LHCGR gene), rs13429458 (THADA gene) and rs2479106 (DENND1A gene), PCOS, hirsutism and metabolic and hormonal parameters in a well characterized cohort of Caucasian patients of Danish descendant with PCOS or hirsutism.
STUDY DESIGN: Patients underwent clinical examination, hormone analyses, oral glucose tolerance test and transvaginal ultrasound. Genetic variation was tested using allelic discrimination by real-time PCR.
PATIENTS: 268 patients referred to The Department of Endocrinology, Odense University Hospital, Denmark with PCOS or hirsutism between 1997 and 2011. Two hundred and forty-eight healthy females were included as controls.
RESULTS: Genotype distributions and allele frequencies of rs13405728, rs13429458, and rs2479106 were comparable in patients and controls. The rs2479106 G allele was associated with a decreased PCOS susceptibility. None of the SNPs were associated with hirsutism or increased metabolic parameters.
CONCLUSIONS: The rs2479106 G allele was associated with decreased PCOS susceptibility, thus confirming previously reported findings of association between rs2479106 and PCOS. Metabolic and hormonal parameters were comparable between genotypes of rs13405728 and rs2479106.
Bentov Y, Kenigsberg S, Casper RFA novel luteinizing hormone/chorionic gonadotropin receptor mutation associated with amenorrhea, low oocyte yield, and recurrent pregnancy loss.
Fertil Steril. 2012; 97(5):1165-8 [PubMed
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OBJECTIVE: To study the cause for poor oocyte yield, amenorrhea, and recurrent pregnancy loss in a patient undergoing IVF.
DESIGN: Case report.
SETTING: University-affiliated private IVF clinic.
PATIENT(S): A 33-year-old woman with amenorrhea, recurrent ovarian cyst formation, poor oocyte yield, and repeated chemical pregnancies after IVF treatments.
INTERVENTION(S): The hCG stimulation test and luteinizing hormone/chorionic gonadotropin receptor (LHCGR) gene sequencing.
MAIN OUTCOME MEASURE(S): The presence of LHCGR gene mutations.
RESULT(S): The patient had a markedly abrogated androgen response to 10,000 IU of hCG. A novel heterozygous inactivating mutation in exon 1 of the LHCGR gene was detected. This mutation was superimposed on a common LHCGR polymorphism.
CONCLUSION(S): This novel mutation may provide a potential genetic mechanism for the poor oocyte recovery in some IVF cases. It is the first example of a heterozygous inactivating mutation in the LHCGR gene.
Capalbo A, Sagnella F, Apa R, et al.The 312N variant of the luteinizing hormone/choriogonadotropin receptor gene (LHCGR) confers up to 2·7-fold increased risk of polycystic ovary syndrome in a Sardinian population.
Clin Endocrinol (Oxf). 2012; 77(1):113-9 [PubMed
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OBJECTIVE: Polycystic ovary syndrome (PCOS) is a frequent condition, affecting about 15% of women of reproductive age. Because of its familial occurrence, a multifactorial model of susceptibility, including both genetic and environmental factors, has been proposed. However, the identification of genetic factors has been elusive.
DESIGN: Case-control study aimed at evaluating possible associations between functionally relevant variants of the luteinizing hormone/choriogonadotrophin receptor gene (LHCGR) and PCOS phenotype.
PATIENTS: A total of 198 PCOS and 187 non-PCOS women, aged 14-35 years, of Sardinian origin, were referred to the outpatient clinic of the Department of Obstetrics and Gynaecology of the University of Cagliari (Sardinia). PCOS diagnosis was based on the Rotterdam criteria.
MEASUREMENTS: We determined the genotype of ins18LQ, S291N and S312N variants at the LHCGR locus. Genotype was related to the presence or absence of PCOS and to several clinical and biochemical characteristics.
RESULTS: The presence of at least one 312N allele was strongly associated with PCOS risk (OR, 2·04; 95% CI, 1·32-3·14; χ(2) , 10·47; P = 0·001). 312N homozygosity was associated with a further risk increase (OR, 2·73; 95% CI, 1·25-5·95; χ(2) , 6·65; P = 0·01). The number of ins18LQ alleles was associated with LH serum levels in controls (χ(2) , 8·04, P = 0·017).
CONCLUSIONS: For the first time, we have identified a genetic variant that is strongly associated with PCOS in an isolated population. These results, if confirmed in other cohorts, may provide the opportunity to test the S312N genotype at the LHCGR locus in fertile women to assess the risk of PCOS. The avoidance of triggering factors like weight increase may improve the reproductive outcome of potentially at-risk subjects.
Brokken LJ, Lundberg-Giwercman Y, Rajpert De-Meyts E, et al.Association of polymorphisms in genes encoding hormone receptors ESR1, ESR2 and LHCGR with the risk and clinical features of testicular germ cell cancer.
Mol Cell Endocrinol. 2012; 351(2):279-85 [PubMed
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Testicular germ cell cancer (TGCC) is the most common malignancy in young men. Genetic variants known to be associated with risk of TGCC only partially account for the observed familial risks. We aimed to identify additional polymorphisms associated with risk as well as histological and clinical features of TGCC in 367 patients and 214 controls. Polymorphisms in ESR2 (rs1256063; OR=0.53, 95% CI: 0.35-0.79) and LHCGR (rs4597581; OR=0.68, 95% CI: 0.51-0.89, and rs4953617; OR=1.88, 95% CI: 1.21-2.94) associated with risk of TGCC. Polymorphisms in ESR1 (rs9397080; OR=1.85, 95% CI: 1.18-2.91) and LHCGR (rs7371084; OR=2.37, 95% CI: 1.26-4.49) associated with risk of seminoma and metastasis, respectively. SNPs in ESR1 (rs9397080) and LHCGR (rs7371084) were predictors of higher LH levels and higher androgen sensitivity index in healthy subjects. The results suggest that polymorphisms in ESR1, ESR2 and LHCGR contribute to the risk of developing TGCC, histological subtype, and risk to metastasis.
BACKGROUND: Polycystic ovary syndrome (PCOS) is a complex endocrine disorder with a strong familial component. PCOS is characterised by hyperandrogenaemia and irregular menses. A recent genome-wide association study (GWAS) of PCOS in a Chinese cohort identified three reproducible PCOS susceptibility loci mapping to 2p16.3 (luteinising hormone/choriogonadotropin receptor; LHCGR), 2p21 (thyroid associated protein; THADA), and 9q33.3 (DENN/MADD domain containing 1A; DENNDIA). The impact of these loci in non-Chinese PCOS cohorts remains to be determined.
METHODS AND RESULTS: The study tested association with PCOS of seven single nucleotide polymorphisms mapping to the three Chinese PCOS loci in two European derived PCOS cohorts (cohort A = 939 cases and 957 controls; cohort B = 535 cases and 845 controls). Cases fulfilled the National Institute of Child Health & Human Development criteria for PCOS. Variation in DENND1A was strongly associated with PCOS in the study cohort (p(combined cohorts)=10(-8)); multiple variants in THADA were also associated with PCOS, while there was no significant evidence for association of LHCGR variation with PCOS. The present study had >80% power to detect an effect of similar size as was observed by Chen et al for DENND1A and THADA, but reduced power (at <40%) for LHCGR at p=0.0001. The study had sufficient power (57-88%) for LHCGR at p=0.01.
CONCLUSIONS: At least two of the PCOS susceptibility loci identified in the Chinese PCOS GWAS (DENND1A and THADA) are also associated with PCOS in European derived populations, and are therefore likely to be important in the aetiology of PCOS regardless of ethnicity. The analysis of the LHCGR gene was not sufficiently powered to detect modest effects.
Hogg K, Young JM, Oliver EM, et al.Enhanced thecal androgen production is prenatally programmed in an ovine model of polycystic ovary syndrome.
Endocrinology. 2012; 153(1):450-61 [PubMed
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One of the hallmarks of polycystic ovary syndrome (PCOS) is increased ovarian androgen secretion that contributes to the ovarian, hormonal, and metabolic features of this condition. Thecal cells from women with PCOS have an enhanced capacity for androgen synthesis. To investigate whether this propensity is a potential cause, rather than a consequence, of PCOS, we used an ovine prenatal androgenization model of PCOS and assessed ewes at 11 months of age. Pregnant Scottish Greyface ewes were administered 100 mg testosterone propionate (TP) or vehicle control twice weekly from d 62 to 102 of gestation, and female offspring (TP = 9, control = 5) were studied. Prenatal TP exposure did not alter ovarian morphology or cyclicity, or plasma androgen, estrogen, and gonadotropin concentrations, at this stage. However, follicle function was reprogrammed in vivo with increased proportions of estrogenic follicles (P < 0.05) in the TP-exposed cohort. Furthermore, in vitro the thecal cells of follicles (>4 mm) secreted more LH-stimulated androstenedione after prenatal androgenization (P < 0.05), associated with increased basal expression of thecal StAR (P < 0.01), CYP11A (P < 0.05), HSD3B1 (P < 0.01), CYP17 (P < 0.05), and LHR (P < 0.05). This provides the first evidence of increased thecal androgenic capacity in the absence of a PCOS phenotype, suggesting a thecal defect induced during fetal life.
BACKGROUND: MicroRNAs have been widely-studied with regard to their aberrant expression and high correlation with tumorigenesis and progression in various solid tumors. With the major goal of assessing gonadotropin (luteinizing hormone, LH) contributions to LH receptor (LHR)-positive ovarian cancer cells, we have conducted a genome-wide transcriptomic analysis on human epithelial ovarian cancer cells to identify the microRNA-associated cellular response to LH-mediated activation of LHR.
METHODS: Human ovarian cancer cells (SKOV3) were chosen as negative control (LHR-) and stably transfected to express functional LHR (LHR+), followed by incubation with LH (0-20 h). At different times of LH-mediated activation of LHR the cancer cells were analyzed by a high-density Ovarian Cancer Disease-Specific-Array (DSA, ALMAC™), which profiled ∼ 100,000 transcripts with ∼ 400 non-coding microRNAs.
FINDINGS: In total, 65 microRNAs were identified to exhibit differential expression in either LHR expressing SKOV3 cells or LH-treated cells, a few of which have been found in the genomic fragile regions that are associated with abnormal deletion or amplification in cancer, such as miR-21, miR-101-1, miR-210 and miR-301a. By incorporating the dramatic expression changes observed in mRNAs, strong microRNA/mRNA regulatory pairs were predicted through statistical analyses coupled with collective computational prediction. The role of each microRNA was then determined through a functional analysis based on the highly-confident microRNA/mRNA pairs.
CONCLUSION: The overall impact on the transcriptome-level expression indicates that LH may regulate apoptosis and cell growth of LHR+ SKOV3 cells, particularly by reducing cancer cell proliferation, with some microRNAs involved in regulatory roles.
BACKGROUND: Since a substantial percentage of ovarian cancers express gonadotropin receptors and are responsive to the relatively high concentrations of pituitary gonadotropins during the postmenopausal years, it has been suggested that receptor activation may contribute to the etiology and/or progression of the neoplasm. The goal of the present study was to develop a cell model to determine the impact of luteinizing hormone (LH) receptor (LHR) expression and LH-mediated LHR activation on gene expression and thus obtain insights into the mechanism of gonadotropin action on ovarian surface epithelial (OSE) carcinoma cells.
METHODS: The human ovarian cancer cell line, SKOV-3, was stably transfected to express functional LHR and incubated with LH for various periods of time (0-20 hours). Transcriptomic profiling was performed on these cells to identify LHR expression/activation-dependent changes in gene expression levels and pathways by microarray and qRT-PCR analyses.
RESULTS: Through comparative analysis on the LHR-transfected SKOV-3 cells exposed to LH, we observed the differential expression of 1,783 genes in response to LH treatment, among which five significant families were enriched, including those of growth factors, translation regulators, transporters, G-protein coupled receptors, and ligand-dependent nuclear receptors. The most highly induced early and intermediate responses were found to occupy a network impacting transcriptional regulation, cell growth, apoptosis, and multiple signaling transductions, giving indications of LH-induced apoptosis and cell growth inhibition through the significant changes in, for example, tumor necrosis factor, Jun and many others, supportive of the observed cell growth reduction in in vitro assays. However, other observations, e.g. the substantial up-regulation of the genes encoding the endothelin-1 subtype A receptor, stromal cell-derived factor 1, and insulin-like growth factor II, all of which are potential therapeutic targets, may reflect a positive mediation of ovarian cancer growth.
CONCLUSION: Overall, the present study elucidates the extensive transcriptomic changes of ovarian cancer cells in response to LH receptor activation, which provides a comprehensive and objective assessment for determining new cancer therapies and potential serum markers, of which over 100 are suggested.
Boot AM, Lumbroso S, Verhoef-Post M, et al.Mutation analysis of the LH receptor gene in Leydig cell adenoma and hyperplasia and functional and biochemical studies of activating mutations of the LH receptor gene.
J Clin Endocrinol Metab. 2011; 96(7):E1197-205 [PubMed
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CONTEXT: Germline and somatic activating mutations in the LH receptor (LHR) gene have been reported.
OBJECTIVE: Our objective was to perform mutation analysis of the LHR gene of patients with Leydig cell adenoma or hyperplasia. Functional studies were conducted to compare the D578H-LHR mutant with the wild-type (WT)-LHR and the D578G-LHR mutant, a classic cause of testotoxicosis. The three main signal transduction pathways in which LHR is involved were studied.
PATIENTS: We describe eight male patients with gonadotropin-independent precocious puberty due to Leydig cell adenoma or hyperplasia.
RESULTS: The D578H-LHR mutation was found in the adenoma or nodule with hyperplasia in all but two patients. D578H-LHR displayed a constitutively increased but noninducible production of cAMP, led to a very high production of inositol phosphates, and induced a slight phosphorylation of p44/42 MAPK in the absence of human chorionic gonadotropin. The D578G-LHR showed a response intermediate between WT-LHR and the D578H-LHR. Subcellular localization studies showed that the WT-LHR was almost exclusively located at the cell membrane, whereas the D578H-LHR showed signs of internalization. D578H-LHR was the only receptor to colocalize with early endosomes in the absence of human chorionic gonadotropin.
CONCLUSIONS: Although several LHR mutations have been reported in testotoxicosis, the D578H-LHR mutation, which has been found only as a somatic mutation, appears up until now to be specifically responsible for Leydig cell adenomas. This is reflected by the different activation of the signal transduction pathways, when compared with the WT-LHR or D578G-LHR, which may explain the tumorigenesis in the D578H mutant.