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Updated: May 17, 2026

A High Resolution Method to Monitor Phosphorylation-dependent Activation of IRF3
Published on: January 24, 2016
A negative regulator or just an unconcerned passerby: phosphoinositide 3-kinase signalling in IL-12 production
1Department of Biochemistry, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi 409-3898, Japan. keiji-miyazawa@umin.ac.jp
Abstract:
Pathogens are eliminated from the host by the cooperative functions of the innate and adaptive immune systems, where interleukin 12 (IL-12) plays a crucial role. As overactivity of IL-12 can lead to autoimmune-mediated tissue damage, IL-12 production is tightly regulated. Notably, the phosphoinositide 3-kinase (PI3K) pathway suppresses Toll-like receptor (TLR)-induced IL-12 production as an auto-inhibitory regulator in dendritic cells. However, Okazaki et al. (C5a controls TLR-induced IL-10 and IL-12 production independent of phosphoinositide 3-kinase. J. Biochem. 2011;149:265-274) recently indicated that PI3K activated downstream of C5a anaphylatoxin does not affect the induction of IL-12 by TLR, although C5a efficiently inhibits the induction, in macrophages. PI3K is thus a context-dependent regulator of TLR-mediated IL-12 production.
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