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Abdominal adipose tissue cytokine gene expression: relationship to obesity and metabolic risk factors

¹Section on Gerontology and Geriatric Medicine and ²Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, North Carolina; and ³Division of Diabetes, Metabolism and Nutrition, University of Maryland School of Medicine, Baltimore, Maryland

Submitted 3 September 2004 ; accepted in final form 17 November 2004

Adipose tissue is a major source of inflammatory and thrombotic cytokines. This study investigated the relationship of abdominal subcutaneous adipose tissue cytokine gene expression to body composition, fat distribution, and metabolic risk during obesity. We determined body composition, abdominal fat distribution, plasma lipids, and abdominal subcutaneous fat gene expression of leptin, TNF-, IL-6, PAI-1, and adiponectin in 20 obese, middle-aged women (BMI, 32.7 ± 0.8 kg/m²; age, 57 ± 1 yr). A subset of these women without diabetes (n = 15) also underwent an OGTT. In all women, visceral fat volume was negatively related to leptin (r = –0.46, P < 0.05) and tended to be negatively related to adiponectin (r = –0.38, P = 0.09) gene expression. Among the nondiabetic women, fasting insulin (r = 0.69, P < 0.01), 2-h insulin (r = 0.56, P < 0.05), and HOMA index (r = 0.59, P < 0.05) correlated positively with TNF- gene expression; fasting insulin (r = 0.54, P < 0.05) was positively related to, and 2-h insulin (r = 0.49, P = 0.06) tended to be positively related to, IL-6 gene expression; and glucose area (r = –0.56, P < 0.05) was negatively related to, and insulin area (r = –0.49, P = 0.06) tended to be negatively related to, adiponectin gene expression. Also, adiponectin gene expression was significantly lower in women with vs. without the metabolic syndrome (adiponectin--actin ratio, 2.26 ± 0.46 vs. 3.31 ± 0.33, P < 0.05). We conclude that abdominal subcutaneous adipose tissue expression of inflammatory cytokines is a potential mechanism linking obesity with its metabolic comorbidities.

adipose cytokine; visceral fat; glucose; insulin

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