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Stimulation of the class-A scavenger receptor induces neutrophil extracellular traps (NETs) by ERK dependent NOX2 and ROMO1 activation.

Biochem. Biophys. Res. Commun.2019 Apr 16;511(4):847-854. Epub 2019 Mar 06
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摘要


Neutrophil extracellular traps (NETs) play a critical role in host antimicrobial response whereas they are also implicated in the pathogenesis of inflammatory and autoimmunediseases. Generation of reactiveoxygen species is key to NETs formation. A variety of stimulatory ligands have been found to enhance production and thus trigger NETs. However, the mechanisms that connect receptor stimuli with duanyu1670 production and NETs formation remain unclear. In this study, we described a new mechanism of NETs generation in neutrophils triggered by stimulation of the class A scavenger receptor (SRA), a major subtype of scavenger receptors in response to various stimuli during infection and inflammatory disorders. By using polyinosinic acid (Poly I), a ribonucleotide ligand of SRA, we demonstrated that SRA stimulation lead to selective ERK phosphorylation, which upregulated cytosol duanyu1670 levels and induced canonical NETs formation by activating NADPH oxidase 2 (NOX2). Interestingly, our results showed that mitochondrial duanyu1670 production was also enhanced by the SRA dependent ERK activation through upregulation and activation of reactive oxygen species modulator 1(ROMO1), a mitochondrial membrane protein and a key mediator of Moreover, inhibition of the SRA elicited ROMO1 activation dampened NETs release upon SRA stimulation. Overall, our study describes a new insight into the NETs release triggered by membrane SRA stimulation and mediated by ERK dependent NOX2 and ROMO1 activation.

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