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• W4298325636 abstract "ABSTRACT CD47 is a ubiquitously expressed cell surface integrin-associated protein. Recently, we have demonstrated that integrin Mac-1 (α M β 2 , CD11b/CD18, CR3), the major adhesion receptor on the surface of myeloid cells, can be coprecipitated with CD47. However, the molecular basis for the CD47-Mac-1 interaction and its functional consequences remain unclear. Here, we demonstrated that CD47 regulates macrophage functions directly interacting with Mac-1. In particular, adhesion, spreading, migration, phagocytosis, and fusion of CD47-deficient macrophages were significantly decreased. The functional link between CD47 and Mac-1 was validated by co-immunoprecipitation analysis using various Mac-1-expressing cells. In HEK293 cells expressing individual α M and β 2 integrin subunits, CD47 has been found to bind both subunits. Interestingly, the amount of CD47 recovered with the free β 2 subunit was higher than in the complex with the whole integrin. Furthermore, activating Mac-1-expressing HEK293 cells with PMA, Mn 2+ , and activating antibody increased CD47 in complex with Mac-1, suggesting greater stability of the complex with integrin in the extended conformation. Notably, on the surface of cells lacking CD47, fewer Mac-1 molecules could convert into an extended conformation in response to activation. The binding site in CD47 for Mac-1 was identified in its constituent IgV domain. The complementary binding sites for CD47 in Mac-1 were localized in integrin epidermal growth factor-like domains 3 and 4 of the β 2 and calf-1 and calf-2 domains of the α subunits. These results indicate that Mac-1 forms a lateral complex with CD47, which regulates essential macrophage functions by stabilizing the extended integrin conformation." @default.
• W4298325636 created "2022-10-02" @default.
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• W4298325636 date "2022-10-01" @default.
• W4298325636 modified "2023-10-16" @default.
• W4298325636 title "THE ASSOCIATION OF CD47 WITH INTEGRIN Mac-1 REGULATES MACROPHAGE RESPONSES BY STABILIZING THE EXTENDED INTEGRIN CONFORMATION" @default.
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• W4298325636 doi "https://doi.org/10.1101/2022.09.30.510402" @default.
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