Effects of peroxisome proliferator-activated receptor ligands, bezafibrate and fenofibrate, on adiponectin level

Aki Hiuge, Alexander Tenenbaum, Norikazu Maeda, Michal Benderly, Masahiro Kumada, Enrique Z. Fisman, David Tanne, Zipora Matas, Toshiyuki Hibuse, Koichi Fujita, Hitoshi Nishizawa, Yehuda Adler, Michael Motro, Shinji Kihara, Iichiro Shimomura, Solomon Behar, Tohru Funahashi

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVE - Adiponectin is adipose-specific secretory protein and acts as anti-diabetic and anti-atherosclerotic molecule. We previously found peroxisome proliferators response element in adiponectin promoter region, suggesting that peroxisome proliferator-activated receptor (PPAR) ligands elevate adiponectin. Fibrates are known to be PPARα ligands and were shown to reduce risks of diabetes and cardiovascular disease. Effect of fibrates on adiponectin has not been clarified, whereas thiazolidinediones enhance adiponectin. Thus, we explored the possibility and mechanism that fibrates enhance adiponectin in humans, mice, and cells. METHODS AND RESULTS - Significant increase of serum adiponectin was observed in bezafibrate-treated subjects compared with placebo group in patients enrolled in The Bezafibrate Infarction Prevention study. Higher baseline adiponectin levels were strongly associated with reduced risk of new diabetes. Fibrates, bezafibrate and fenofibrate, significantly elevated adiponectin levels in wild-type mice and 3T3-L1 adipocytes. Such an effect was not observed in PPARα-deficient mice and adipocytes. Fibrates activated adiponectin promoter but failed to enhance its activity when the point mutation occurred in peroxisome proliferators response element site and the endogenous PPARα was knocked down by PPARα-RNAi. CONCLUSIONS - Our results suggest that fibrates enhance adiponectin partly through adipose PPARα and measurement of adiponectin might be a useful tool for searching subjects at high risk for diabetes.

Original languageEnglish
Pages (from-to)635-641
Number of pages7
JournalArteriosclerosis, Thrombosis, and Vascular Biology
Volume27
Issue number3
DOIs
StatePublished - Mar 2007
Externally publishedYes

Keywords

  • Adipocyte
  • Adiponectin
  • Fibrate
  • Metabolic syndrome
  • Peroxisome proliferator-activated receptor

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