Signal regulatory protein alpha1 is involved in the inhibitory effect of glucocorticoid receptor on the proliferation of murine macrophage RAW264.7 cell and mouse peritoneal macrophage

Journal of Molecular Endocrinology
Xiaohui WangJian Lu

Abstract

Glucocorticoid (GC) effectively suppresses immune and inflammatory responses and inhibits the growth of several types of cells, but the role of GC and its receptor on macrophage proliferation is unclear. In our previous work, we found RAW-GR(-) cells (murine macrophage RAW264.7 cells stably transfected with GR-siRNA expression vector by RNA interference) grew faster by about twofold. In this study, we further explored the role and mechanisms of GC/GR on the proliferation of macrophage. We found that the growth of RAW264.7 cells was inhibited by dexamethasone (Dex) in a concentration-dependent manner. The mRNA and protein levels of signal regulatory protein alpha1 (SIRPA) were induced by GC/GR in RAW264.7 cells and SIRPA expression was decreased remarkably in RAW-GR(-) cells. Overexpression of SIRPA negatively regulated the proliferation of RAW-GR(-) cells, and inhibition of SIRPA expression by a small from RNA interference attenuated Dex-induced proliferation inhibition in RAW264.7 cells. The proliferation inhibition of GC/GR was also found in mouse peritoneal macrophage, which was associated with the increase in SIRPA induced by GC/GR as well. In addition, elevation of the expression of CDK2, cyclinD1, and cyclinB1, but not ph...Continue Reading

Citations

Jul 11, 2018·Frontiers in Immunology·Arnon Dias JurbergIngo Riederer

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