Tzu-Chi Medical Journal (Jan 2017)

Serum leptin level positively correlates with metabolic syndrome among elderly Taiwanese

  • Li-Hsuan Wang,
  • Yao-Chang Liu,
  • Ji-Hung Wang,
  • Chung-Jen Lee,
  • Bang-Gee Hsu

DOI
https://doi.org/10.4103/tcmj.tcmj_60_17
Journal volume & issue
Vol. 29, no. 3
pp. 159 – 164

Abstract

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Objective: Leptin is an adipocyte-derived hormone and has shown positive correlation with obesity and metabolic syndrome (MetS) in many studies. However, there are few studies investigating this relation in elderly people. Therefore, we aimed to investigate the correlation between the fasting serum leptin level and MetS among older Taiwanese. Materials and Methods: The fasting serum leptin level was obtained from 62 Taiwanese participants over 65 years old and was measured using a commercially available enzyme immunoassay kit. MetS and its components were defined using diagnostic criteria from the International Diabetes Federation. Results: Thirty elderly participants (48.4%) had MetS. The serum leptin level was positively correlated with MetS (P < 0.001). Multivariate logistic regression analysis of the factors significantly associated with MetS showed that logarithmically transformed leptin (log-leptin, each increase 0.1 ng/mL log-leptin, odds ratio: 1.276, 95% confidence interval: 1.015–1.603,P= 0.037) was still an independent predictor of MetS in elderly persons. Univariable linear analysis showed that body weight (r = 0280,P= 0.028), body mass index (r = 0.417,P= 0.001), waist circumference (r = 0.419,P= 0.001), blood urea nitrogen (r = 0255,P= 0.046), log-insulin (r = 0436,P< 0.001), and logarithmically transformed homeostasis model assessment of insulin resistance (r = 0359,P= 0.004) positively correlated with fasting serum log-leptin levels. Multivariate forward stepwise linear regression analysis of the factors significantly associated with fasting serum log-leptin levels revealed that waist circumference (adjusted R2 = 0.083,P= 0.002), statin use (adjusted R2 = 0.058,P= 0.016), and female gender (adjusted R2 = 0.041,P= 0.034) were independent predictors of fasting serum log-leptin levels among elderly participants. Conclusion: In elderly Taiwanese, the serum leptin level was positively correlated with MetS. Waist circumference, statin use, and female gender were independent predictors of the fasting serum leptin level in elderly participants.

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