Inflammation-induced interstitial migration of effector CD4+ T cells is dependent on integrin αV

MG Overstreet, A Gaylo, BR Angermann… - Nature …, 2013 - nature.com
MG Overstreet, A Gaylo, BR Angermann, A Hughson, YM Hyun, K Lambert, M Acharya
Nature immunology, 2013nature.com
Leukocytes must traverse inflamed tissues to effectively control local infection. Although
motility in dense tissues seems to be integrin independent and based on actomyosin-
mediated protrusion and contraction, during inflammation, changes to the extracellular
matrix (ECM) may necessitate distinct motility requirements. Indeed, we found that the
interstitial motility of T cells was critically dependent on Arg-Gly-Asp (RGD)-binding integrins
in the inflamed dermis. Inflammation-induced deposition of fibronectin was functionally …
Abstract
Leukocytes must traverse inflamed tissues to effectively control local infection. Although motility in dense tissues seems to be integrin independent and based on actomyosin-mediated protrusion and contraction, during inflammation, changes to the extracellular matrix (ECM) may necessitate distinct motility requirements. Indeed, we found that the interstitial motility of T cells was critically dependent on Arg-Gly-Asp (RGD)-binding integrins in the inflamed dermis. Inflammation-induced deposition of fibronectin was functionally linked to higher expression of integrin αV on effector CD4+ T cells. By intravital multiphoton imaging, we found that the motility of CD4+ T cells was dependent on αV expression. Selective blockade or knockdown of αV arrested T helper type 1 (TH1) cells in the inflamed tissue and attenuated local effector function. Our data demonstrate context-dependent specificity of lymphocyte movement in inflamed tissues that is essential for protective immunity.
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