Adiponectin to Leptin Ratio and its Association with Insulin Resistance in Women with Polycystic Ovarian Syndrome

BACKGROUND: Adiponectin and leptin play a major role in metabolic homeostasis. Adiponectin to Leptin ratio can be used as an indicator of insulin resistance and a marker of polycystic ovarian syndrome (PCOS). The study was planned to compare serum adiponectin, leptin, and adiponectin to leptin ratio in age and BMI matched women with and without PCOS and to find out the association of adiponectin to leptin ratio with Insulin resistance in these women. METHODS: It was a cross-sectional study done in the Gynecology outpatient clinic in a tertiary care center. A total of 120 women, 60 with PCOS and 60 age and BMI matched women without PCOS, who presented in the clinic after the index cases were enrolled and tested for serum adiponectin, leptin, and insulin sensitivity. The main outcome measures were serum levels of adiponectin, leptin, adiponectin to leptin ratio, oral glucose tolerance test, serum insulin and HOMA-IR. RESULTS: PCOS women had lower serum Adiponectin, higher serum Leptin level and lower Adiponectin to Leptin ratio compared to non PCOS women, 2.15 ± 3.07 ng/ml vs 10.7 ± 27.91 ng/ml, P < 0.0001; 24.25 ± 16.5 ng/ml vs 13.89 ± 11.19 ng/ml, P = 0.0003 and 0.15 ± 0.24 vs 3.03 ± 15.04, P < 0.0001, respectively. Plasma glucose 2 hours after 75 gm glucose and serum Insulin was significantly increased in PCOS women (108.78 ± 10.22 mg/dl vs 100.18 ± 4.89 mg/dl, P = 0.001 and 5.7 ± 9.53 mU/ml vs 3.02 ± 5.34 mU/ml, P = 0.02, respectively). The mean values of fasting plasma glucose and HOMA-IR were comparable in both groups, P = 0.145, P = 0.719, respectively. There was no significant association of A/L Ratio with BMI, plasma glucose 2 hours after 75 gm glucose, serum Insulin and HOMA-IR, in these women, r = -0.074, P = 0.5754; r = -0.203, P = 0.12; r = -0.018, P = 0.8915; and r = -0.041, P = 0.757, respectively. CONCLUSION: Adiponectin to leptin ratio is significantly reduced in women with PCOS but has no association with insulin resistance.