CLINICAL NEPHROLOGY, vol.83, no.3, pp.147-153, 2015 (SCI-Expanded)
Objective: Leptin is a hormone and a proinflammatory cytokine secreted from adipocytes, which functions to suppress appetite in healthy persons. Serum leptin levels are significantly elevated in patients with end-stage renal disease (ESRD) primarily due to decreased clearance by the kidneys. The consequence of hyperleptinemia in ESRD is not fully understood. We aimed to investigate the association between serum leptin levels and nutrition/inflammation status in non-obese chronic hemodialysis (HD) patients. Methods: 65 chronic, anuric, non-obese (body mass index (BMI) < 25 kg/m(2)) HD patients were included in this cross-sectional study. Demographic, anthropometric, and biochemical data were obtained from all patients to determine nutrition and inflammation status. Patients were classified into the 3 groups according to serum leptin levels; group 1 (low leptin, n = 9), group 2 (normal leptin, n = 31), and group 3 (high leptin, n = 25). Results: Mean age and duration on dialysis of 65 patients (male/female: 34/31) were 51.6 +/- 17.8 years and 78.0 +/- 67.9 months, respectively. Serum leptin levels increased with older age, female gender, higher BMI and triceps skinfold thickness. Elevated serum leptin levels were significantly associated with good nutritional status parameters, such as higher albumin (p = 0.001), prealbumin (p = 0.033), total iron binding capacity (p = 0.045), total cholesterol (p = 0.041), and lower malnutrition inflammation score (MIS) (p = 0.002). Serum leptin levels remained a negative correlation with MIS after adjustments made for BMI. No correlation was established between leptin and inflammation parameters including ferritin, highly sensitive C-reactive protein (hs-CRP), and tumor necorsis factor alpha (TNF-alpha). Conclusion: Elevated serum leptin levels seem to be associated with good nutritional status. However, there was no correlation between leptin and inflammatory status.