The H3K9 methyltransferase Setdb1 regulates TLR4-mediated inflammatory responses in macrophages
2016
Proinflammatory cytokineproduction in macrophages involves multiple regulatory mechanisms, which are affected by environmental and intrinsic stress. In particular, accumulating evidence has suggested epigenetic control of macrophage differentiation and function mainly in vitro.
SET domain, bifurcated 1 (Setdb1, also known as Eset) is a histone 3 lysine 9 (H3K9)-specific
methyltransferaseand is essential for early development of embryos. Here we demonstrate that Setdb1 in macrophages potently suppresses Toll-like receptor 4 (
TLR4)-mediated expression of
proinflammatory cytokinesincluding
interleukin-6 through its
methyltransferaseactivity. As a molecular mechanism, Setdb1-deficiency decreases the basal H3K9 methylation levels and augments
TLR4-mediated NF-κB recruitment on the proximal promoter region of
interleukin-6, thereby accelerating
interleukin-6 promoter activity. Moreover, macrophage-specific Setdb1-knockout mice exhibit higher serum
interleukin-6 concentrations in response to lipopolysaccharide challenge and are more susceptible to endotoxin shock than wildtype mice. This study provides evidence that the H3K9
methyltransferaseSetdb1 is a novel epigenetic regulator of
proinflammatory cytokineexpression in macrophages in vitro and in vivo. Our data will shed insight into the better understanding of how the immune system reacts to a variety of conditions.
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