Anti-obesity, anti-diabetic, and lipid lowering effects of the thyroid receptor β subtype selective agonist KB-141

Galina Bryzgalova, Suad Effendic, Akhtar Khan, Stefan Rehnmark, Peter Barbounis, Jamie Boulet, Gao Dong, Rajni Singh, Sue Shapses, Johan Malm, Paul Webb, John D. Baxter, Gary J. Grover

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

Selective thyroid hormone receptor subtype-β (TRβ) agonists have received attention as potential treatments for hypercholesterolemia and obesity, but have received less attention as treatments for diabetes, partly because this condition is not improved in thyroid hormone excess states. The TRβ selective agonist KB-141 induces 5-10% increases in metabolic rate and lowering of plasma cholesterol levels without tachycardia in lean rats, unlike the major active thyroid hormone, T3. In the current study, we determined whether KB-141 promotes weight loss in obese animals and whether it exhibits anti-diabetogenic effects. Body weight, adiposity (DEXA), and lipid levels were examined following p.o. administration of KB-141 to obese Zucker fa/fa rats at 0.00547-0.547 mg/kg/day for 21 days, and in ob/ob mice at 0.5 mg/kg/day KB-141 for 7 days. In rats, KB-141 reduced body weight by 6 and 8%, respectively, at 0.167 and 0.0547 mg/kg/day without tachycardia and adiposity was reduced at 0.167 mg/kg/day (5-6%). In ob/ob mice, KB-141 lowered serum cholesterol (35%), triacylglycerols (35%) and both serum and hepatic free fatty acids (18-20%) without tachycardia. Treatment of ob/ob mice with KB-141 (0.0547 or 0.328 mg/kg/day over 2 weeks) improved glucose tolerance and insulin sensitivity in a dose-dependent manner with no effect on heart rate. Thus, KB-141 elicits anti-obesity, lipid lowering and anti-diabetic effects without tachycardia suggesting that selective TRβ activation may be useful strategy to attenuate features of the metabolic syndrome.

Original languageEnglish (US)
Pages (from-to)262-267
Number of pages6
JournalJournal of Steroid Biochemistry and Molecular Biology
Volume111
Issue number3-5
DOIs
StatePublished - Sep 1 2008

Keywords

  • Cholesterol
  • KB-141
  • Obesity
  • Thyroid hormones

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology

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