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- W2037122674 abstract "High mobility group box 1 (HMGB1) is an endogenous danger signal molecule. In the postischemic brain, HMGB1 is massively released during acute damaging process and triggers inflammatory processes. Moreover, it has been reported HMGB1 augments the proinflammatory effect of LPS by direct interaction. In previous studies, the authors showed intranasally delivered a HMGB1 binding heptamer peptide (HBHP; HMSKPVQ) has robust neuroprotective effects in the ischemic brain after middle cerebral artery occlusion and that it exerts an anti-inflammatory effect. In the present study, the authors investigated whether HBHP suppresses the augmentation of the proinflammatory effect of LPS by HMGB1. In primary microglial cultures, low doses of LPS (5 ng/ml) and recombinant HMGB1 (rHMGB1, 20 ng/ml) synergistically activated microglial cells, and HMGB1–LPS binding was detected. In addition, synergistic NO accumulation along with direct HMGB1–LPS binding was also observed when primary microglial cultures were treated with LPS (5 ng/ml) and HMGB1 accumulated in NMDA-conditioned medium (NCM). Co-treatment of microglial cells with HBHP and LPS or rHMGB1 (NCM), or treatment with rHMGB1 or NCM and LPS after pre-incubating rHMGB1 (or NCM) with HBHP markedly suppressed their synergistic activation. Furthermore, interactions between rHMGB1 and LPS or between HMGB1 in NCM and LPS were suppressed dose-dependently by HBHP, indicating that HBHP suppressed the synergism between HMGB1 and LPS and the underlying mechanism involved inhibition of HMGB1–LPS binding. Together these results show HBHP has anti-inflammatory effects, and that it inhibits synergism caused by the binding of HMGB1 and LPS." @default.
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- W2037122674 date "2015-04-01" @default.
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- W2037122674 title "HMGB1-binding heptamer suppresses the synergistic effect of HMGB1 and LPS by interacting directly with HMGB1" @default.
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- W2037122674 doi "https://doi.org/10.1016/j.neulet.2015.03.012" @default.
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