Assessment of Adiponectin and Sperm Function Parameters in Obese and Non-Obese: A Comprehensive Study

The role of adiponectin in sperm function is inconclusive and there is a paucity of evidence. Obesity shows an ambiguous influence on sperm motility, and male subfertility. The aim of this study was to compare the role of adiponectin and sperm functional parameters among obese and non-obese men.

In this comprehensive study, 64 male patients were included, and were classified as non-obese [body mass index (BMI)< 24.9 kg/m2, n=32] and obese (BMI >25 kg/m2, n=32) groups. Sperm analysis, was conducted using World Health Organization (WHO) 2010 standards. Real-time polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA) were used for the analysis of adiponectin gene expression and protein levels, respectively. Sperm viability was assessed using the 3-(4, 5-dimethylthiazol-2-yl)-2, 5- diphenyl tetrazolium bromide (MTT test), Acridine orange (AO) test was utilized to detect DNA denaturation, and sperm chromatin dispersion (SCD) technique was used to investigate the fragmentation of DNA.

In obese men, adiponectin gene expression (P<0.0001) and protein levels (P<0.001) were significantly lower compared to the non-obese group. Additionally, sperm motility, was significantly lower in the obese group. The rapid progressive (RP) motility was less in obese men in comparison to the non-obese group (P<0.001). Sperm count and morphology were not significantly different in the two groups. DNA denaturation and DNA fragmentation were significantly more frequent in the obese group than in non-obese men (P<0.05) and (P<0.01), respectively. The obese men showed significantly lower sperm viability compared to the non-obese group (P<0.05).

This study showed no significant correlation between the evaluated variables (sperm parameter, sperm viability, DNA fragmentation and integrity), and obesity in men. Based on these results, adiponectin may potentially play positive role in sperm function for acquiring fertility.