Identification of circular dorsal ruffles as signal platforms for the AKT pathway in glomerular podocytes.
AKT
circular dorsal ruffle
mTORC2
macropinocytosis
podocyte
Journal
Journal of cellular physiology
ISSN: 1097-4652
Titre abrégé: J Cell Physiol
Pays: United States
ID NLM: 0050222
Informations de publication
Date de publication:
05 2023
05 2023
Historique:
revised:
21
02
2023
received:
18
12
2022
accepted:
28
02
2023
medline:
18
5
2023
pubmed:
17
3
2023
entrez:
16
3
2023
Statut:
ppublish
Résumé
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.
Substances chimiques
Proto-Oncogene Proteins c-akt
EC 2.7.11.1
Mechanistic Target of Rapamycin Complex 1
EC 2.7.11.1
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1063-1079Informations de copyright
© 2023 Wiley Periodicals LLC.
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