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Related Experiment Video

Updated: Jul 10, 2026

Quantitative Analysis of Cell Edge Dynamics during Cell Spreading

Quantitative Analysis of Cell Edge Dynamics during Cell Spreading

Published on: May 22, 2021

A molecular switch that controls cell spreading and retraction.

Panagiotis Flevaris¹, Aleksandra Stojanovic, Haixia Gong

¹Department of Pharmacology, University of Illinois at Chicago, Chicago, IL 60612, USA.

The Journal of Cell Biology

|October 31, 2007

Summary

Calpain cleavage of integrin beta(3) at Tyr(759) controls cell spreading versus retraction. This switch regulates cell adhesion, migration, and proliferation, impacting thrombosis, wound repair, immunity, and cancer.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Integrin signaling controls cell adhesion, migration, and proliferation, crucial for various physiological and pathological processes.
The mechanisms by which integrin outside-in signaling dictates opposing cellular behaviors like spreading and retraction remain unclear.

Purpose of the Study:

To elucidate the role of calpain cleavage of integrin beta(3) in regulating cell spreading and retraction.
To identify the molecular players involved in switching integrin signaling outcomes.

Main Methods:

Utilized mutant forms of integrin beta(3) (cleavage-resistant and constitutively cleaved) in Chinese hamster ovary cells.
Investigated the impact of these mutants on cell spreading, clot retraction, and RhoA signaling.
Assessed the binding of c-Src to integrin beta(3) and its effect on RhoA activity.

Main Results:

Calpain cleavage of integrin beta(3) at Tyr(759) promotes cell retraction and inhibits cell spreading.
A cleavage-resistant beta(3) mutant enhanced cell spreading but impaired clot retraction and RhoA signaling.
A constitutively cleaved beta(3) mutant failed to mediate cell spreading, an effect rescued by RhoA pathway inhibition.
Cleaved beta(3) did not bind c-Src, which is essential for integrin-induced cell spreading by inhibiting RhoA.

Conclusions:

Calpain cleavage of integrin beta(3) at Tyr(759) acts as a critical switch, shifting integrin signaling from promoting cell spreading to inducing cell retraction.
This cleavage releases c-Src-mediated inhibition of RhoA, thereby activating the RhoA pathway and driving cell retraction.
Findings provide novel insights into the regulation of cell adhesion dynamics and have implications for diseases involving cell migration.