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Thyroid hormone receptor regulates most genes independently of fibroblast growth factor 21 in liver.
J Endocrinol
March 2015
Houston Methodist Research InstituteGenomic Medicine Program, 6670 Bertner Ave, Houston, Texas 77030, USACollege of Arts and SciencesChemistry Department, Indiana University Bloomington, Bloomington, Indiana, USADepartments of PaediatricsOncology, and Physiology and Pharmacology, University of Western Ontario, London, Ontario, CanadaChildren's Health Research InstituteLondon, Ontario, CanadaDepartment of Molecular Physiology and BiophysicsBaylor College of Medicine, Houston, Texas, USAThe Third Affiliated Hospital of Guangzhou Medical UniversityGuangzhou, China Houston Methodist Research InstituteGenomic Medicine Program, 6670 Bertner Ave, Houston, Texas 77030, USACollege of Arts and SciencesChemistry Department, Indiana University Bloomington, Bloomington, Indiana, USADepartments of PaediatricsOncology, and Physiology and Pharmacology, University of Western Ontario, London, Ontario, CanadaChildren's Health Research InstituteLondon, Ontario, CanadaDepartment of Molecular Physiology and BiophysicsBaylor College of Medicine, Houston, Texas, USAThe Third Affiliated Hospital of Guangzhou Medical UniversityGuangzhou, China
Thyroid hormone (TH) acts through specific receptors (TRs), which are conditional transcription factors, to induce fibroblast growth factor 21 (FGF21), a peptide hormone that is usually induced by fasting and that influences lipid and carbohydrate metabolism via local hepatic and systemic endocrine effects. While TH and FGF21 display overlapping actions when administered, including reductions in serum lipids, according to the current models these hormones act independently in vivo. In this study, we examined mechanisms of regulation of FGF21 expression by TH and tested the possibility that FGF21 is required for induction of hepatic TH-responsive genes.
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