Peroxisome proliferator activated receptor‐γ, leptin and tumor necrosis factor‐α mRNA expression during very low calorie diet in subcutaneous adipose tissue in obese women

Background

PPARγ, leptin and TNFα are three major factors that play a key role in influencing adipocyte differentiation and both adipose tissue function and metabolism. However, the regulation of these three genes during a dynamic period of weight loss is unknown. We therefore investigated the concomitant regulation of the mRNA expression of PPARγ, leptin and TNFα in adipose tissue during a 21‐day very low calorie diet (VLCD) in 12 non‐diabetic obese women.

Methods

The mRNA levels of PPARγ, leptin and TNFα were quantified by quantitative RT‐competitive PCR in abdominal subcutaneous adipose tissue before and during VLCD (940 kcal/day).

Results

VLCD induced weight loss (∼6 kg) and improved insulin sensitivity. Simultaneously, VLCD induced the reduction in the adipose tissue mRNA abundances of PPARγ (−13%, p<0.05) and of leptin (−58%, p<0.005), whereas TNFα mRNA levels increased (+78%, p<0.005). PPARγ and leptin mRNA levels were correlated before (r=0.778, p<0.01) and after VLCD (r=0.797, p<0.01). Serum HDL‐cholesterol concentrations were positively associated with PPARγ (r=0.696, p<0.03) and leptin (r=0.806, p<0.01) mRNA levels.

Conclusions

The increase in TNFα mRNA levels suggested that a local increased expression of this cytokine in adipose tissue might play a role in the control of the fat mass during weight loss. PPARγ and leptin mRNA levels were positively associated both before and after VLCD, suggesting that common regulatory mechanism(s) might control their expression. More strikingly, we found strong positive correlations between circulating HDL‐cholesterol and both PPARγ and leptin mRNA levels, suggesting the existence of physiological links between circulating lipoprotein metabolism and adipose tissue function. Copyright © 1999 John Wiley & Sons, Ltd.