Growth hormone activated STAT5 is required for induction of beige fat in vivo. (October 2018)

• Record Type: Journal Article
• Authors: Nelson, Caroline N.; List, Edward O.; Ieremia, Makerita; Constantin, Lena; Chhabra, Yash; Kopchick, John J.; Waters, Michael J.
• Is Part Of: Growth hormone & IGF research. Volume 42/43(2018)
• Page Start: 40
• Page End: 51
• Publication Date: 2018-10
• Subjects: Growth hormone -- Adipose beiging -- b3-adrenergic -- FGF 21 -- Obesity -- Mouse; Growth regulators -- Periodicals; Growth -- Regulation -- Periodicals; Somatomedin -- Periodicals; Somatomedins -- Periodicals; Growth Hormone -- Periodicals; Growth Substances -- Periodicals; Croissance -- Régulation -- Périodiques; Croissance -- Régulateurs -- Périodiques; Somatotrophine -- Périodiques; Somatomédine -- Périodiques; Growth -- Regulation; Growth regulators; Electronic journals; Periodicals; Electronic journals; 612.4
• DOI: 10.1016/j.ghir.2018.08.004
• Languages: English
• ISSNs: 1096-6374

Abstract

Abstract: Objective: The anti-obesity actions of growth hormone (GH) led us to investigate if GH signaling is able to regulate beige/brite fat development of white adipose tissue (WAT). Methods: We studied WAT in GHR-391 mice engineered to be unable to activate STAT5 in response to GH, in mice with adipose specific deletion of GHR, in GHR−/− mice and in bGH transgenic mice. QPCR, immunoblots and immunohistochemistry were used to characterize WAT. The in vivo effects of β-3 adrenergic activation with CL-316, 243 and that of FGF21 infusion were also studied. Results: GHR-391 mice had lower surface temperature than WT, with deficiency in β-oxidation and beiging transcripts including Ucp1. Oxidative phosphorylation complex subunit proteins were decreased dramatically in GHR-391 inguinal white adipose tissue (iWAT), but increased in bGH iWAT, as were proteins for beige/brown markers. In accord with its lack of β-3 adrenergic receptors, iWAT of GHR-391 mice did not beige in response to administration of the β-3 specific agonist CL-316, 243 in contrast to WT mice. GHR-391 mice are deficient in FGF21, but unlike WT, infusion of the purified protein was without effect on extent of beiging. Finally, fat-specific deletion of the GHR replicated the loss of beiging associated transcripts. Conclusion: In addition to promoting lipolysis, our study suggests that GH is able to promote formation of beige adipose tissue through activation of STAT5 and induction of Adrb3. This sensitizes WAT to adrenergic input, and may contribute to the anti-obesity actions of GH. Highlights: Removal of the growth hormone receptor (GHR) prevents beiging of white adipose tissue (WAT) in mice. Removal of the portion of the GHR responsible for STAT-5 signaling also prevents beiging of WAT in mice. Beiging of WAT by GH is mediated largely through induction of beta3 adrenergic receptors, likely by STAT5.