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Rockefeller University Press, Journal of Cell Biology, 4(190), p. 553-563, 2010

DOI: 10.1083/jcb.201002067

Rockefeller University Press, Journal of Experimental Medicine, 9(207), p. i25-i25

DOI: 10.1084/jem2079oia25

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Coordinated RhoA signaling at the leading edge and uropod is required for T cell transendothelial migration

Journal article published in 2010 by Sarah J. Heasman, Leo M. Carlin, Susan Cox, Tony Ng ORCID, Anne J. Ridley
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Transendothelial migration (TEM) is a tightly regulated process whereby leukocytes migrate from the vasculature into tissues. Rho guanosine triphosphatases (GTPases) are implicated in TEM, but the contributions of individual Rho family members are not known. In this study, we use an RNA interference screen to identify which Rho GTPases affect T cell TEM and demonstrate that RhoA is critical for this process. RhoA depletion leads to loss of migratory polarity; cells lack both leading edge and uropod structures and, instead, have stable narrow protrusions with delocalized protrusions and contractions. By imaging a RhoA activity biosensor in transmigrating T cells, we find that RhoA is locally and dynamically activated at the leading edge, where its activation precedes both extension and retraction events, and in the uropod, where it is associated with ROCK-mediated contraction. The Rho guanine nucleotide exchange factor (GEF) GEF-H1 contributes to uropod contraction but does not affect the leading edge. Our data indicate that RhoA activity is dynamically regulated at the front and back of T cells to coordinate TEM.