期刊
METABOLISM-CLINICAL AND EXPERIMENTAL
卷 59, 期 4, 页码 547-553出版社
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.metabol.2009.08.018
关键词
-
资金
- Heart and Stroke Foundation of Ontario [T-6162]
- Heart and Stroke Foundation of Canada
Thyroid-stimulating hormone (TSH) stimulates adipocyte lipolysis, but signal transduction pathways activated by TSH for this response have not been directly studied. Using differentiated 3T3-L1 adipocytes as well as primary human adipocytes, we characterized the lipolytic action of TSH with dose-response and time-course studies, and compared it with isoproterenol. Thyroid-stimulating hormone stimulated phosphorylation of perilipin and hormone-sensitive lipase (HSL). Inhibition of protein kinase A with 1189 blocked TSH-stimulated lipolysis as well as phosphorylation of perilipin and HSL. Thyroid-stimulating hormone stimulated lipolysis in vivo, as indicated by an elevation in serum free fatty acid (FFA) levels after recombinant human TSH administration to thyroidectomized patients (42% increase, n = 19, P<.05). For patients with a body mass index less than 30 kg/m(2), the TSH-induced increase in scrum FFA levels was 53% (n = 11, P <.05), whereas levels in patients with a body mass index of at least 30 kg/m(2) (n = 8) did not change after TSH treatment. In summary, TSH stimulates lipolysis and phosphorylation of perilipin and HSL in a protein kinase A dependent manner in differentiated adipocytes in culture and raises serum FFA levels in vivo. (C) 2010 Elsevier Inc. All rights reserved.
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