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Vinpocetine Suppresses Streptococcus pneumoniae-Induced Inflammation via Inhibition of ERK1 by CYLD.

J Immunol. 2020 Feb 15;204(4):933-942. Epub 2020 Jan 03
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摘要


Otitis media (OM) is the most common bacterial infection in children. It remains a major health problem and a substantial socioeconomic burden. Streptococcus pneumoniae (S. pneumoniae) is one of the most common bacterial pathogens causing OM. Innate inflammatory response plays a critical role in host defense against bacterial pathogens. However, if excessive, it has a detrimental impact on the middle ear, leading to middle ear inflammation, a hallmark of OM. Currently, there has been limited success in developing effective therapeutic agents to suppress inflammation without serious side effects. In this study, we show that vinpocetine, an antistroke drug, suppressed S. pneumoniae-induced inflammatory response in cultured middle ear epithelial cells as well as in the middle ear of mice. Interestingly, vinpocetine inhibited S. pneumoniae-induced inflammation via upregulating a key negative regulator cylindromatosis (CYLD). Moreover, CYLD suppressed S. pneumoniae-induced inflammation via inhibiting the activation of ERK. Importantly, the postinfection administration of vinpocetine markedly inhibited middle ear inflammation induced by S. pneumoniae in a well-established mouse OM model. These studies provide insights into the molecular mechanisms underlying the tight regulation of inflammation via inhibition of ERK by CYLD and identified vinpocetine as a potential therapeutic agent for suppressing the inflammatory response in the pathogenesis of OM via upregulating negative regulator CYLD expression.

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