TY - JOUR
T1 - Molecularly Distinct Clathrin-Coated Pits Differentially Impact EGFR Fate and Signaling
AU - Pascolutti, Roberta
AU - Algisi, Veronica
AU - Conte, Alexia
AU - Raimondi, Andrea
AU - Pasham, Mithun
AU - Upadhyayula, Srigokul
AU - Gaudin, Raphael
AU - Maritzen, Tanja
AU - Barbieri, Elisa
AU - Caldieri, Giusi
AU - Tordonato, Chiara
AU - Confalonieri, Stefano
AU - Freddi, Stefano
AU - Malabarba, Maria Grazia
AU - Maspero, Elena
AU - Polo, Simona
AU - Tacchetti, Carlo
AU - Haucke, Volker
AU - Kirchhausen, Tom
AU - Di Fiore, Pier Paolo
AU - Sigismund, Sara
PY - 2019/6/4
Y1 - 2019/6/4
N2 - Adaptor protein 2 (AP2) is a major constituent of clathrin-coated pits (CCPs). Whether it is essential for all forms of clathrin-mediated endocytosis (CME) in mammalian cells is an open issue. Here, we demonstrate, by live TIRF microscopy, the existence of a subclass of relatively short-lived CCPs lacking AP2 under physiological, unperturbed conditions. This subclass is retained in AP2-knockout cells and is able to support the internalization of epidermal growth factor receptor (EGFR) but not of transferrin receptor (TfR). The AP2-independent internalization mechanism relies on the endocytic adaptors eps15, eps15L1, and epsin1. The absence of AP2 impairs the recycling of the EGFR to the cell surface, thereby augmenting its degradation. Accordingly, under conditions of AP2 ablation, we detected dampening of EGFR-dependent AKT signaling and cell migration, arguing that distinct classes of CCPs could provide specialized functions in regulating EGFR recycling and signaling. EGFR signaling controls different cell physiological processes, including proliferation and migration. Pascolutti et al. describe an additional layer of regulation of EGFR signaling, relying on the sequestration of receptors into molecularly distinct clathrin-coated vesicles that regulate receptor fate toward recycling versus degradation, with impact on the final cellular output.
AB - Adaptor protein 2 (AP2) is a major constituent of clathrin-coated pits (CCPs). Whether it is essential for all forms of clathrin-mediated endocytosis (CME) in mammalian cells is an open issue. Here, we demonstrate, by live TIRF microscopy, the existence of a subclass of relatively short-lived CCPs lacking AP2 under physiological, unperturbed conditions. This subclass is retained in AP2-knockout cells and is able to support the internalization of epidermal growth factor receptor (EGFR) but not of transferrin receptor (TfR). The AP2-independent internalization mechanism relies on the endocytic adaptors eps15, eps15L1, and epsin1. The absence of AP2 impairs the recycling of the EGFR to the cell surface, thereby augmenting its degradation. Accordingly, under conditions of AP2 ablation, we detected dampening of EGFR-dependent AKT signaling and cell migration, arguing that distinct classes of CCPs could provide specialized functions in regulating EGFR recycling and signaling. EGFR signaling controls different cell physiological processes, including proliferation and migration. Pascolutti et al. describe an additional layer of regulation of EGFR signaling, relying on the sequestration of receptors into molecularly distinct clathrin-coated vesicles that regulate receptor fate toward recycling versus degradation, with impact on the final cellular output.
KW - AP2
KW - clathrin-coated pits
KW - EGFR
KW - endocytic adaptors
KW - endocytosis
KW - eps15
KW - epsin
KW - receptor degradation
KW - recycling
KW - signaling
KW - transcription
UR - http://www.scopus.com/inward/record.url?scp=85065903115&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85065903115&partnerID=8YFLogxK
U2 - 10.1016/j.celrep.2019.05.017
DO - 10.1016/j.celrep.2019.05.017
M3 - Article
C2 - 31167147
AN - SCOPUS:85065903115
VL - 27
SP - 3049-3061.e6
JO - Cell Reports
JF - Cell Reports
SN - 2211-1247
IS - 10
ER -