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- W4327602489 abstract "Abstract Circular dorsal ruffles (CDRs) are rounded membrane ruffles induced by growth factors to function as precursors of the large‐scale endocytosis called macropinocytosis. In addition to their role in cellular uptake, recent research using cell line systems has shown that CDRs/macropinocytosis regulate the canonical AKT–mTORC1 growth factor signaling pathway. However, as CDRs have not been observed in tissues, their physiological relevance has remained unclear. Here, utilizing ultrahigh‐resolution scanning electron microscopy, we first report that CDRs are expressed in glomerular podocytes ex vivo and in vivo, and we visually captured the transformation process to macropinocytosis. Moreover, through biochemical and imaging analyses, we show that AKT phosphorylation localized to CDRs upstream of mTORC1 activation in podocyte cell lines and isolated glomeruli. These results demonstrate the physiological role of CDRs as signal platforms for the AKT–mTORC1 pathway in glomerular podocytes at the tissue level. As mTORC1 plays critical roles in podocyte metabolism, and aberrant activation of mTORC1 triggers podocytopathies, our results strongly suggest that targeting CDR formation could represent a potential therapeutic approach for these diseases." @default.
- W4327602489 created "2023-03-17" @default.
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- W4327602489 date "2023-03-16" @default.
- W4327602489 modified "2023-10-14" @default.
- W4327602489 title "Identification of circular dorsal ruffles as signal platforms for the AKT pathway in glomerular podocytes" @default.
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- W4327602489 doi "https://doi.org/10.1002/jcp.30996" @default.
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