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• W2067097331 abstract "The Lys49-phospholipases A(2) (K49-PLAs) are abundant in many pit vipers' venom. They are highly basic myotoxins and capable of binding membranes but lack hydrolytic activity. Considerable attention has been directed to its antibacterial activity but the exact mechanisms remain unclear. We now evaluate the roles of a K49-PLA from Trimeresurus stejnegeri venom in antagonizing the effects of lipopolysaccharide (LPS) on mouse macrophages (RAW264.7 cells). The K49-PLA markedly reduced LPS-stimulated production of NO, MCP-1, RANTES, and iNOS. RT-PCR analysis also confirmed its suppression of LPS-induced transcription of these cellular proteins. Moreover, LPS-induced activation of NFkappaB was dramatically abolished, while phosphorylation and degradation of IkappaB were also inhibited. Other types of venom phospholipases tested did not show the same effects as K49-PLA. Finally, strong binding between K49-PLA and LPS with a dissociation constant at the order of 10nM was shown by microcalorimetry titration. These findings provide unprecedented evidence that a low dose of K49-PLA possesses potent anti-inflammatory and antibacterial properties, which raises the prospect of a new therapeutic approach against sepsis." @default.
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• W2067097331 date "2007-12-01" @default.
• W2067097331 modified "2023-10-09" @default.
• W2067097331 title "Binding of a venom Lys-49 phospholipase A2 to LPS and suppression of its effects on mouse macrophages" @default.
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• W2067097331 doi "https://doi.org/10.1016/j.toxicon.2007.06.025" @default.
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