Follicular fluid redox balance and DNA damage according to PCOS phenotype

Area of Science:

• Reproductive Endocrinology
• Oxidative Stress Research
• Infertility Studies

Background:

• Polycystic Ovary Syndrome (PCOS) is a complex endocrine disorder with diverse clinical presentations.
• Classifying PCOS by phenotype is crucial for understanding disease mechanisms and guiding treatment.
• Oxidative stress and DNA damage are implicated in the pathophysiology of PCOS and infertility.

Purpose of the Study:

• To investigate follicular fluid levels of total oxidant capacity (TOC), total antioxidant capacity (TAC), and 8-hydroxy-2'-deoxyguanosine (8-OHdG) in patients with different PCOS phenotypes undergoing In-Vitro Fertilization/Intra-Cytoplasmic Sperm Injection (IVF/ICSI).
• To correlate these oxidative stress markers and DNA degradation products with specific PCOS phenotypes.

Main Methods:

• Follicular fluid samples were collected from 30 PCOS patients (classified into four phenotypes: A, B, C, D) and 20 controls during oocyte retrieval.
• Levels of TOC, TAC (redox balance markers), and 8-OHdG (DNA degradation product) were measured.
• The Oxidative Stress Index (OSI) was calculated.

Main Results:

• All four PCOS phenotypes exhibited significantly higher follicular fluid 8-OHdG levels compared to controls.
• Serum TOC levels were elevated in all PCOS phenotypes versus controls, while TAC levels were lower.
• The Oxidative Stress Index (OSI) was significantly higher in all PCOS phenotypes, with Phenotypes B and D showing higher OSI than A and C.

Conclusions:

• PCOS phenotypes are characterized by increased oxidative stress (elevated TOC and OSI, decreased TAC) and DNA degradation (increased 8-OHdG) in follicular fluid.
• Elevated oxidative stress and subsequent DNA damage in follicular fluid are strongly associated with PCOS-related subfertility.
• These findings highlight the potential role of oxidative stress as a primary mechanism contributing to infertility in women with PCOS.