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Integrin associated proteins differentially regulate neutrophil polarity and directed migration in 2D and 3D
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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E-Jurnal
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Statement of Responsibility |
Yukie Yamahashi 1,2...[et al]
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