The role of PI3Ks in the regulation of the neutrophil NADPH oxidase
The role of PI3Ks in the regulation of the neutrophil NADPH oxidase
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DOI：
10.1042/bss2007c06
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发表时间：
2007-01-01
期刊：
影响因子：
--
通讯作者：
Stephens, Len R.
中科院分区：
文献类型：
--
作者：
Hawkins, Phillip T.;Davidson, Keith;Stephens, Len R.
The NADPH oxidase complex of neutrophils and macrophages is an important weapon used by these cells to kill microbial pathogens. The regulation of this enzyme complex is necessarily complicated by the diverse receptor types that are needed to trigger its activation and also the tight control that is required to deliver this activation at the appropriate time and place. As such, several signalling pathways have been established to regulate the NADPH oxidase downstream of cell surface receptors. Central amongst these are PI3K-(phosphoinositide 3-kinase)-dependent pathways, blockade of which severely limits activation of the oxidase to several soluble and particulate stimuli. The precise roles of the phosphoinositide products of PI3K activity in regulating NADPH oxidase assembly and activation are still unclear, but there is emerging evidence that they play a key role via regulation of guanine nucleotide exchange on Rac, a key component in the oxidase complex. There is also very strong evidence that the PI3K products PtdIns(3,4)P-2 and PtdIns3P can bind directly to the PX (Phox homology) domains of the core oxidase components p47(phox) and p40(phox), respectively. However, the significance of these interactions in terms of membrane localization or allosteric consequences for the oxiclase complex remains to be established.
