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- W2012115247 abstract "Sepsis is a leading cause of death that is characterized by uncontrolled inflammatory response. In this study, we report that scavenger receptor BI (SR-BI), a high density lipoprotein receptor, is a critical survival factor of sepsis. We induced sepsis using an established septic animal model, cecal ligation and puncture (CLP). CLP induced 100% fatality in SR-BI-null mice but only 21% fatality in wild type littermates. SR-BI-null mice exhibited aberrant inflammatory responses with delayed inflammatory cytokine generation at the early stage of sepsis and highly elevated inflammatory cytokine production 20 h after CLP treatment. To understand the mechanisms underlying SR-BI protection, we elucidated the effect of macrophage SR-BI on inflammatory cytokine generation. Macrophages from SR-BI-null mice produced significantly higher levels of inflammatory cytokines than those of wild type controls in response to LPS. Importantly, transgenic mice overexpressing SR-BI were more resistant to CLP-induced septic death. Using an HEK-Blue(TM) cell system, we demonstrated that expression of SR-BI suppressed TLR4-mediated NF-kappaB activation. To understand why SR-BI-null mice had a delayed inflammatory response, we elucidated the effect of SR-BI on LPS clearance during sepsis. Compared with wild type controls, SR-BI-null mice had lower plasma LPS levels in the early stage of sepsis and elevated plasma LPS levels 20 h following CLP treatment. In conclusion, our findings demonstrate that SR-BI is a critical protective modulator of sepsis in mice. SR-BI exerts its protective function through its role in modulating inflammatory response in macrophages and facilitating LPS recruitment and clearance." @default.
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- W2012115247 date "2009-07-01" @default.
- W2012115247 modified "2023-10-10" @default.
- W2012115247 title "Scavenger Receptor BI Protects against Septic Death through Its Role in Modulating Inflammatory Response" @default.
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- W2012115247 doi "https://doi.org/10.1074/jbc.m109.020933" @default.
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