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- W1971094792 abstract "Microglia and macrophages express the alpha(M)/beta(2) integrin complement-receptor-3 (CR3/MAC-1; CD11b/CD18) and scavenger-receptor-AI/II (SRAI/II). Both can mediate myelin phagocytosis. We document that CR3/MAC-1 mediated myelin phagocytosis in microglia is modulated by complement and anti-CR3/MAC-1 mAbs. Complement augmented phagocytosis twofold. Anti-alpha(M) mAbs M1/70 and 5C6 inhibited and anti-beta(2) mAb M18/2 augmented myelin phagocytosis in the presence and absence of active complement. Active complement modulated phagocytosis inhibition by M1/70 and 5C6 and phagocytosis augmentation by M18/2. CR3/MAC-1 mediated myelin phagocytosis may thus be, at least partially, independent of but modulated by complement. Anti-beta(2) mAb Game-46 did not affect phagocytosis. However, combining M18/2 with Game-46 resulted in phagocytosis augmentation that was larger in magnitude than that induced by M18/2 alone. Thus, phagocytosis augmentation induced by one anti-beta(2) mAb was potentiated by another anti-beta(2) mAb. Combining M1/70 or 5C6 with M18/2 inhibited M18/2-induced augmentation. Overall, mAbs-induced phagocytosis modulation ranged three- to sevenfold from inhibition to augmentation. Anti-CR3/MAC-1 mAbs may reveal a mechanism by which native extracellular molecules bind to and modulate CR3/MAC-1 mediated myelin phagocytosis in microglia and macrophages. We further document SRAI/II mediated myelin phagocytosis in microglia and CR3/MAC-1 contributing to myelin phagocytosis two- to threefold more than SRAI/II when the two receptors function together." @default.
- W1971094792 created "2016-06-24" @default.
- W1971094792 creator A5041874079 @default.
- W1971094792 creator A5043618169 @default.
- W1971094792 date "2003-02-01" @default.
- W1971094792 modified "2023-09-23" @default.
- W1971094792 title "Complement-receptor-3 and scavenger-receptor-AI/II mediated myelin phagocytosis in microglia and macrophages" @default.
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- W1971094792 doi "https://doi.org/10.1016/s0969-9961(02)00008-6" @default.
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