Serum Pigment Epithelium-Derived Factor Levels are Associated with Estradiol and Decrease After Adjusting for Alanine...

Area of Science:

• Endocrinology
• Metabolic Research
• Biomarker Discovery

Background:

• Metabolic syndrome (MetS) is a cluster of conditions increasing cardiovascular and diabetes risk.
• Pigment epithelium-derived factor (PEDF) is a protein with diverse biological roles, including potential links to metabolic health.
• Understanding factors influencing PEDF levels is crucial for managing MetS.

Purpose of the Study:

• To evaluate pigment epithelium-derived factor (PEDF) levels in individuals with metabolic syndrome (MetS).
• To investigate potential sex differences in serum PEDF concentrations.
• To explore the relationship between serum PEDF, estradiol, and metabolic parameters.

Main Methods:

• Analysis of serum PEDF and estradiol levels in 318 participants (145 men, 173 women).
• Calculation of insulin resistance (HOMA-IR) and beta-cell function (HOMA-β).
• Multiple linear regression to identify factors associated with serum PEDF.

Main Results:

• Serum PEDF levels were significantly higher in both men and women with MetS compared to non-MetS individuals.
• PEDF levels correlated with numerous metabolic parameters including BMI, blood pressure, glucose, insulin resistance, and lipid profiles.
• Elevated alanine aminotransferase (ALT), insulin resistance (HOMA-IR), and triacylglycerol (TG) predicted higher PEDF. Estradiol showed an inverse correlation with PEDF in women, which diminished after ALT adjustment.

Conclusions:

• Circulating PEDF may serve as a biomarker for MetS in both sexes.
• This study provides novel evidence for sexual dimorphism in circulating PEDF levels, potentially influenced by estrogen.
• The association between estrogen and PEDF is modulated by factors like ALT.