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Critical role of regulator G-protein signaling 10 (RGS10) in modulating macrophage M1/M2 activation.

PLoS One. 2013 Nov 21;8(11):e81785. eCollection 2013
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摘要


Regulator of G protein signaling 10 (RGS10), a GTPase accelerating protein (GAP) for G alpha subunits, is a negative regulator of NF-κB in microglia. Here, we investigated the role of RGS10 in macrophages, a closely related myeloid-derived cell type. Features of classical versus alternative activation were assessed in Rgs10-/- peritoneal and bone marrow-derived macrophages upon LPS or IL-4 treatments, respectively. Our results showed that Rgs10-/- macrophages produced higher levels of pro-inflammatory cytokines including TNF, IL-1β and IL-12p70 in response to LPS treatment and exerted higher cytotoxicity on dopaminergic MN9D neuroblastoma cells. We also found that Rgs10-/- macrophages displayed a blunted M2 phenotype upon IL-4 priming. Specifically, Rgs10-/- macrophages displayed lower YM1 and Fizz1 mRNA levels as measured by QPCR compared to wild type macrophages upon IL-4 treatment and this response was not attributable to differences in IL-4 receptor expression. Importantly, phagocytic activities of Rgs10-/- macrophages were blunted in response to IL-4 priming and/or LPS treatments. However, there was no difference in chemotaxis between Rgs10-/- and WT macrophages. Our data indicate that Rgs10-/- macrophages displayed dysregulated M1 responses along with blunted M2 alternative activation responses, suggesting that RGS10 plays an important role in determining macrophage activation responses.

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