Differential Regulation of Adipocytokine mRNAs by Rosiglitazone in db/db Mice

• Published in: Biochemical and biophysical research communications 2001-08, Vol.286 (4), p.735-741
• Main Authors: Moore, Gary B.T, Chapman, Helen, Holder, Julie C, Lister, Carolyn A, Piercy, Valerie, Smith, Stephen A, Clapham, John C
• Format: Article
• Language: English
• Subjects: Adiponectin; adipose; Adrenergic beta-Agonists - pharmacology; Animals; Blood Glucose - metabolism; db/db; Diabetes Mellitus, Type 2 - genetics; Diabetes Mellitus, Type 2 - metabolism; Female; Gene Expression Regulation - drug effects; Hormones, Ectopic - biosynthesis; Hormones, Ectopic - genetics; Hypoglycemic Agents - pharmacology; Intercellular Signaling Peptides and Proteins; Mice; Mice, Obese; Nerve Growth Factor; peroxisome proliferator-activated receptor ^g; Phenethylamines - pharmacology; PPARγ; Protein Biosynthesis; Proteins - genetics; Pyrimidines - pharmacology; Receptors, Cytoplasmic and Nuclear - metabolism; RELMα; Resistin; RNA, Messenger - biosynthesis; Rosiglitazone; TaqMan; Thiazoles - pharmacology; thiazolidinedione; Thiazolidinediones; TNFα; Transcription Factors - metabolism; Tumor Necrosis Factor-alpha - biosynthesis; Tumor Necrosis Factor-alpha - genetics; β3-adrenoceptor
• ISSN: 0006-291X; 1090-2104
• DOI: 10.1006/bbrc.2001.5460

The precise mechanism by which PPARγ activation by thiazolidinediones (TZDs) improves insulin sensitivity is still unclear. Recent studies have focused on the role of adipocytokines in metabolic control and their regulation by TZDs. In this study, we compared the chronic effects of antihyperglycemic doses of the TZD rosiglitazone, the β3-adrenoceptor agonist BRL-35135, and the PPARα agonist Wy-14,643 on the mRNA expression of adipocytokines in WAT of db/db mice. Rosiglitazone treatment decreased adiponectin and resistin mRNA levels by 57 and 72%, respectively (P < 0.001), with no effect on the level of TNFα or RELMα transcripts. In comparison, Wy-14,643 reduced adiponectin transcript levels by 31% (P = 0.015) while BRL-35135 increased RELMα mRNA expression by 245% (P < 0.001) without effect on the other transcripts. Our results indicate that although a reduction in adiponectin and resistin mRNA levels in WAT by rosiglitazone treatment of diabetic mice may contribute to the antidiabetic effects, an alteration in TNFα, adiponectin, resistin, or RELMα mRNA expression is not absolutely required for the regulation of blood glucose concentration in the db/db mouse.