Impaired metabolic effects of a thyroid hormone receptor beta-selective agonist in a mouse model of diet-induced obesity

Melany Castillo, Beatriz C.G. Freitas, Matthew L. Rosene, Rafael A. Drigo, Renata Grozovsky, Rui M.B. MacIel, Mary Elizabeth Patti, Miriam O. Ribeiro, Antonio C. Bianco

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Background: The use of selective agonists of the thyroid hormone receptor isoform β (TRβ) has been linked to metabolic improvement in animal models of diet-induced obesity, nonalcoholic liver disease, and genetic hypercholesterolemia. Methods: To identify potential target tissues of such compounds, we exposed primary murine brown adipocytes and skeletal myocytes for 24 hours to 50 nM GC-24, a highly selective TRβ agonist. GC-24 (17 ng/[g BW•day] for 36 days) was also tested in a mouse model of diet-induced obesity. Results: While the brown adipocytes responded to GC-24, with 17%-400% increases in the expression of 12 metabolically relevant genes, the myocytes remained largely unresponsive to GC-24 treatment. In control mice kept on chow diet, GC-24 treatment accelerated energy expenditure by about 15% and limited body weight gain by about 50%. However, in the obese animals the GC-24-mediated reduction in body weight gain dropped to only 20%, while energy expenditure remained unaffected. In addition, an analysis of gene expression in the skeletal muscle, brown adipose tissue, and liver of these obese animals failed to identify a conclusive GC-24 transcriptome footprint. Conclusion: Feeding a high-fat diet impairs most of the beneficial metabolic effects associated with treatment with TRβ-selective agonists.

Original languageEnglish (US)
Pages (from-to)545-553
Number of pages9
JournalThyroid
Volume20
Issue number5
DOIs
StatePublished - May 1 2010

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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