miRNA-592 is downregulated and may target LHCGR in polycystic ovary syndrome patients

Area of Science:

• Endocrinology
• Molecular Biology
• Genetics

Background:

• Polycystic ovary syndrome (PCOS) is a common endocrine disorder characterized by infertility and abnormal follicular development.
• Gene expression dysregulation plays a critical role in the pathophysiology of PCOS.

Purpose of the Study:

• To investigate the role of serum microRNAs (miRNAs) in PCOS.
• To identify specific miRNAs and their target genes involved in PCOS pathogenesis.
• To explore the potential of miR-592 as a biomarker and therapeutic target for PCOS.

Main Methods:

• miRNA array and quantitative real-time PCR (qRT-PCR) were used to analyze serum miRNA expression in PCOS patients and controls.
• Computational analysis predicted the interaction between miR-592 and the luteinizing hormone/chorionic gonadotropin receptor (LHCGR) mRNA.
• Luciferase reporter assays confirmed the direct targeting of LHCGR by miR-592.
• Functional studies in KGN cells assessed the impact of miR-592 and LHCGR manipulation on cell viability and cell cycle progression.

Main Results:

• Circulating miR-592 levels were significantly down-regulated in PCOS patients compared to healthy controls.
• miR-592 expression was inversely correlated with LHCGR levels in PCOS patients.
• miR-592 directly targets the 3'UTR region of LHCGR mRNA.
• Overexpression of miR-592 inhibited KGN cell viability and G1 to S phase transition.
• Knockdown of LHCGR impaired KGN cell viability and cell cycle progression, effects reversed by LHCGR co-transfection.

Conclusions:

• miR-592 is significantly down-regulated in PCOS and directly targets LHCGR.
• The miR-592/LHCGR axis plays a crucial role in regulating cell viability and cell cycle progression in PCOS.
• These findings provide novel insights into the molecular mechanisms of PCOS and suggest miR-592 as a potential diagnostic marker and therapeutic target.