PD-LI Promotes Rear Retraction During Persistent Cell Migration by Altering Integrin β4 Dynamics

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2022 Mar 28

PMID 35344032

Authors

Mengdie Wang

Choua Xiong

Arthur M Mercurio

Affiliations

Soon will be listed here.

Abstract

Although the immune checkpoint function of PD-L1 has dominated its study, we report that PD-L1 has an unanticipated intrinsic function in promoting the dynamics of persistent cell migration. PD-L1 concentrates at the rear of migrating carcinoma cells where it facilitates retraction, resulting in the formation of PD-L1-containing retraction fibers and migrasomes. PD-L1 promotes retraction by interacting with and localizing the β4 integrin to the rear enabling this integrin to stimulate contractility. This mechanism involves the ability of PD-L1 to maintain cell polarity and lower membrane tension at the cell rear compared with the leading edge that promotes the localized interaction of PD-L1 and the β4 integrin. This interaction enables the β4 integrin to engage the actin cytoskeleton and promote RhoA-mediated contractility. The implications of these findings with respect to cell-autonomous functions of PD-L1 and cancer biology are significant.

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