Cytohesins are cytoplasmic ErbB receptor activators.

Abstract:

:Signaling by ErbB receptors requires the activation of their cytoplasmic kinase domains, which is initiated by ligand binding to the receptor ectodomains. Cytoplasmic factors contributing to the activation are unknown. Here we identify members of the cytohesin protein family as such factors. Cytohesin inhibition decreased ErbB receptor autophosphorylation and signaling, whereas cytohesin overexpression stimulated receptor activation. Monitoring epidermal growth factor receptor (EGFR) conformation by anisotropy microscopy together with cell-free reconstitution of cytohesin-dependent receptor autophosphorylation indicate that cytohesins facilitate conformational rearrangements in the intracellular domains of dimerized receptors. Consistent with cytohesins playing a prominent role in ErbB receptor signaling, we found that cytohesin overexpression correlated with EGF signaling pathway activation in human lung adenocarcinomas. Chemical inhibition of cytohesins resulted in reduced proliferation of EGFR-dependent lung cancer cells in vitro and in vivo. Our results establish cytohesins as cytoplasmic conformational activators of ErbB receptors that are of pathophysiological relevance.

journal_name

Cell

journal_title

Cell

authors

Bill A,Schmitz A,Albertoni B,Song JN,Heukamp LC,Walrafen D,Thorwirth F,Verveer PJ,Zimmer S,Meffert L,Schreiber A,Chatterjee S,Thomas RK,Ullrich RT,Lang T,Famulok M

doi

10.1016/j.cell.2010.09.011

subject

Has Abstract

pub_date

2010-10-15 00:00:00

pages

201-11

issue

2

eissn

0092-8674

issn

1097-4172

pii

S0092-8674(10)01059-7

journal_volume

143

pub_type

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