PRL receptor-mediated effects in female mouse adipocytes: PRL induces suppressors of cytokine signaling expression and suppresses insulin-induced leptin production in adipocytes in vitro

Endocrinology
C Ling, H Billig

Abstract

PRL has been reported to regulate fat metabolism in several species. We recently reported PRL receptor (PRLR) expression in mouse adipocytes and increased levels of PRLR expression in the adipose tissue of lactating and PRL-transgenic mice compared with controls. These results suggest PRLR-mediated effects in adipose tissue. However, to date most studies have been performed in vivo, and it is unclear whether PRL has direct effects on adipocytes. The PRLR belongs to the cytokine receptor family, and a family of suppressors of cytokine signaling (SOCS) was recently identified. The present study was performed to investigate whether PRL has direct effects on adipocytes. The expression of cytokine-inducible SH2-domain-containing protein (CIS), SOCS-3, and SOCS-2 mRNA and protein was analyzed using ribonuclease protection assay and immunoblotting, respectively. Ovine PRL induced CIS mRNA expression and a combination of oPRL and insulin induced SOCS-3 mRNA expression in adipocytes cultured in vitro for 0-240 min, demonstrating PRLR-mediated direct effects in these cells. Furthermore, CIS, SOCS-3, and SOCS-2 mRNA and protein were all transiently expressed in adipose tissue obtained from female mice stimulated with oPRL (1 microg/g BW) ...Continue Reading

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