Progesterone resistance may play a role in polycystic ovary syndrome - GreenMedInfo Summary
Progesterone resistance in PCOS endometrium: a microarray analysis in clomiphene citrate-treated and artificial menstrual cycles.
J Clin Endocrinol Metab. 2011 Jun ;96(6):1737-46. Epub 2011 Mar 16. PMID: 21411543
Departamento de Ginecologia e Obstetrícia, Programa de Pós-Graduação em Cirurgia: Ciências Cirúrgicas, Universidade Federal do Rio Grande do Sul, Porto Alegre 90035-903, Brazil.
CONTEXT: Polycystic ovary syndrome (PCOS), the most common endocrinopathy of reproductive-aged women, is characterized by ovulatory dysfunction and hyperandrogenism.
OBJECTIVE: The aim was to compare gene expression between endometrial samples of normal fertile controls and women with PCOS.
DESIGN AND SETTING: We conducted a case control study at university teaching hospitals.
PATIENTS: Normal fertile controls and women with PCOS participated in the study.
INTERVENTIONS: Endometrial samples were obtained from normal fertile controls and from women with PCOS, either induced to ovulate with clomiphene citrate or from a modeled secretory phase using daily administration of progesterone.
MAIN OUTCOME MEASURE: Total RNA was isolated from samples and processed for array hybridization with Affymetrix HG U133 Plus 2 arrays. Data were analyzed using GeneSpring GX11 and Ingenuity Pathways Analysis. Selected gene expression differences were validated using RT-PCR and/or immunohistochemistry in separately obtained PCOS and normal endometrium.
RESULTS: ANOVA analysis revealed 5160 significantly different genes among the three conditions. Of these, 466 were differentially regulated between fertile controls and PCOS. Progesterone-regulated genes, including mitogen-inducible gene 6 (MIG6), leukemia inhibitory factor (LIF), GRB2-associated binding protein 1 (GAB1), S100P, and claudin-4 were significantly lower in PCOS endometrium; whereas cell proliferation genes, such as Anillin and cyclin B1, were up-regulated.
CONCLUSIONS: Differences in gene expression provide evidence of progesterone resistance in midsecretory PCOS endometrium, independent of clomiphene citrate and corresponding to the observed phenotypes of hyperplasia, cancer, and poor reproductive outcomes in this group of women.