Insulin resistance, adipokines, and oxidative stress in nondiabetic, hypercholesterolemic patients: leptin as an 8-epi-prostaglandin F determinant

Min Jeong Shin, Jong Ho Lee, Yangsoo Jang, Eunju Park, Jaewon Oh, Ji Hyung Chung, Namsik Chung

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Limited data are available on the association of insulin resistance, adipokines, and in vivo lipid peroxidation. We investigated the relationships between insulin resistance, adipokines (leptin, adiponectin, and resistin), and oxidative stress in nondiabetic, hypercholesterolemic patients. Seventy-six nondiabetic patients with hypercholesterolemia participated in this cross-sectional study. Fasting glucose and insulin concentrations were analyzed. Serum leptin, adiponectin, and resistin concentrations and urinary excretion of 8-epi-prostaglandin F (8-epi-PGF) were determined using enzyme-linked immunosorbent assay. We divided all subjects into 3 groups, classified by the tertiles of homeostasis model assessment of insulin resistance (HOMA-IR) values, and clinical parameter comparisons were made among the 3 groups. The results showed that serum leptin (P < .001) and adiponectin levels (P < .05) were significantly different among the groups, although serum resistin was not different. Furthermore, the group with the highest HOMA-IR had a significantly higher urinary 8-epi-PGF excretion than the group with the lowest HOMA-IR (P = .017). Circulating leptin was positively correlated with urinary 8-epi-PGF (r = 0.323, P < .01) and HOMA-IR (r = 0.524, P < .001). Circulating adiponectin was negatively correlated with body mass index (r = -0.252, P < .05) and HOMA-IR (r = -0.228, P < .05). We could not find a relationship between circulating adiponectin or resistin and urinary 8-epi-PGF excretion. Stepwise multiple linear regression analysis showed that leptin was associated with the urinary 8-epi-PGF excretion after adjusting for age, sex, body mass index, blood lipids, and HOMA-IR (P = .002). In conclusion, our results show that more insulin-resistant state of nondiabetic, hypercholesterolemic patients is associated with decreased adiponectin and increased leptin and urinary 8-epi-PGF levels, although no relationship with resistin was observed. Furthermore, serum leptin independently contributed to urinary 8-epi-PGF excretion.

Original languageEnglish
Pages (from-to)918-922
Number of pages5
JournalMetabolism: Clinical and Experimental
Volume55
Issue number7
DOIs
Publication statusPublished - 2006 Jul

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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