Rac1, the actin cytoskeleton and microtubules are key players in clathrin-independent endophilin-A3-mediated endocytosis.
J Cell Sci
; 135(14)2022 07 15.
Article
en En
| MEDLINE
| ID: mdl-35703091
ABSTRACT
Endocytic mechanisms actively regulate plasma membrane composition and sustain fundamental cellular functions. Recently, we identified a clathrin-independent endocytic (CIE) modality mediated by the BAR domain protein endophilin-A3 (endoA3, encoded by SH3GL3), which controls the cell surface homeostasis of the tumor marker CD166 (also known as ALCAM). Deciphering the molecular machinery of endoA3-dependent CIE should therefore contribute to a better understanding of its pathophysiological role, which remains so far unknown. Here, we investigate the role of actin, Rho GTPases and microtubules, which are major players in CIE processes, in this mechanism. We show that the actin cytoskeleton is dynamically associated with endoA3- and CD166-positive endocytic carriers, and that its perturbation strongly inhibits the process of CD166 uptake. We also reveal that the Rho GTPase Rac1, but not Cdc42, is a master regulator of this endocytic route. Finally, we provide evidence that microtubules and kinesin molecular motors are required to potentiate endoA3-dependent endocytosis. Of note, our study also highlights potential compensation phenomena between endoA3-dependent CIE and macropinocytosis. Altogether, our data deepen our understanding of this CIE modality and further differentiate it from other unconventional endocytic mechanisms. This article has an associated First Person interview with the first author of the paper.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Clatrina
/
Endocitosis
Límite:
Humans
Idioma:
En
Revista:
J Cell Sci
Año:
2022
Tipo del documento:
Article
País de afiliación:
Bélgica