Integrin Associated Proteins Differentially Regulate Neutrophil Polarity and Directed Migration in 2D and 3D

Overview

Journal Biomed Microdevices

Specialty Biomedical Engineering

Date 2015 Sep 11

PMID 26354879

Citations 25

Authors

Yukie Yamahashi

Peter J Cavnar

Laurel E Hind

Erwin Berthier

David A Bennin

David Beebe

Anna Huttenlocher

Affiliations

Soon will be listed here.

Abstract

Directed neutrophil migration in blood vessels and tissues is critical for proper immune function; however, the mechanisms that regulate three-dimensional neutrophil chemotaxis remain unclear. It has been shown that integrins are dispensable for interstitial three-dimensional (3D) leukocyte migration; however, the role of integrin regulatory proteins during directed neutrophil migration is not known. Using a novel microfluidic gradient generator amenable to 2D and 3D analysis, we found that the integrin regulatory proteins Kindlin-3, RIAM, and talin-1 differentially regulate neutrophil polarization and directed migration to gradients of chemoattractant in 2D versus 3D. Both talin-1-deficient and RIAM-deficient neutrophil-like cells had impaired adhesion, polarization, and migration on 2D surfaces whereas in 3D the cells polarized but had impaired 3D chemotactic velocity. Kindlin-3 deficient cells were able to polarize and migrate on 2D surfaces but had impaired directionality. In a 3D environment, Kindlin-3 deficient cells displayed efficient chemotaxis. These findings demonstrate that the role of integrin regulatory proteins in cell polarity and directed migration can be different in 2D and 3D.

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