Esben Thyssen Vestergaard

Growth hormone acts along PPARγ-FSP27 axis to stimulate lipolysis in human adipocytes

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The lipolytic effects of GH have been known for half a century and play an important physiological role for substrate metabolism during fasting. In addition, sustained GH-induced lipolysis is causally linked to insulin resistance. However, the underlying molecular mechanisms remain elusive. In the present study, we obtained experimental data in human subjects and used human adipose-derived stromal vascular cells (hADSCs) as a model system to elucidate GH-triggered molecular signaling that stimulates adipose tissue lipolysis and insulin resistance in human adipocytes. We discovered that GH downregulates the expression of fat specific protein (FSP27), a negative regulator of lipolysis, by impairing the transcriptional ability of the master transcriptional regulator, peroxisome proliferator-activated receptor gamma (PPARγ) via MEK/ERK activation. Ultimately, GH treatment promotes phosphorylation of PPARγ at Ser273 and causes its translocation from nucleus to the cytosol. Surprisingly, FSP27 overexpression inhibited PPARγ Ser273 phosphorylation and promoted its nuclear retention. GH antagonist treatment had similar effects. Our study identifies a novel signaling mechanism by which GH transcriptionally induce lipolysis via MEK/ERK pathway that acts along PPARγ-FSP27 in human adipose tissue.

Original languageEnglish
JournalA J P: Endocrinology and Metabolism (Online)
Volume316
Issue1
Pages (from-to)E34-E42
Number of pages8
ISSN1522-1555
DOIs
Publication statusPublished - 1 Jan 2019

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