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- W3042162368 abstract "Abstract Many adult connective tissues undergo continuous remodeling to maintain matrix homeostasis. Physiological remodeling involves the degradation of collagen fibers by the intracellular cathepsin‐dependent phagocytic pathway. We considered that a multidomain, small GTPase activating protein, IQGAP1, which is involved in the generation of cell extensions, is required for collagen phagocytosis, possibly arising from its interactions with cdc42 and the actin‐binding protein Flightless I (FliI). We examined the role of IQGAP1 in collagen phagocytosis by human gingival fibroblasts (HGFs) and by IQGAP1+/+ and IQGAP1−/− mouse embryonic fibroblasts. IQGAP1 was strongly expressed by HGFs, localized to vinculin‐stained cell adhesions and sites where cell extensions are initiated, and colocalized with FliI. Immunoprecipitation showed that IQGAP1 associated with FliI. HGFs showed 10‐fold increases of collagen binding, 6‐fold higher internalization, and 3‐fold higher β1 integrin activation between 30 and 180 min after incubation with collagen. Compared with IQGAP1+/+ fibroblasts, deletion of IQGAP1 reduced collagen binding (1.4‐fold), collagen internalization (3‐fold), β1 integrin activation (2‐fold), and collagen degradation (1.8‐fold). We conclude that IQGAP1 affects collagen remodeling through its regulation of phagocytic degradation pathways, which may involve the interaction of IQGAP1 with FliI." @default.
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- W3042162368 date "2020-07-09" @default.
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- W3042162368 title "Role of the small GTPase activating protein IQGAP1 in collagen phagocytosis" @default.
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- W3042162368 doi "https://doi.org/10.1002/jcp.29933" @default.
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