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The Journal of Immunology, Vol 147, Issue 2 398-404, Copyright © 1991 by American Association of Immunologists
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BM Chan, JG Wong, A Rao and ME Hemler
Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115.
Upon Ag stimulation, an arsonate-specific murine T cell clone exhibited a rapid but transient increase in cell adhesion to collagen, fibronectin, and laminin. This increase in cell adhesion was not observed when a mutant T cell clone lacking TCR expression was utilized. However, upon stimulation by phorbol esters, both parent and mutant T cell clones exhibited a similar transient increase in adhesion to the three matrix proteins. The observed cell adhesion was extensively inhibited by antibodies to the integrin beta 1 subunit, indicating the involvement of VLA proteins. Despite changes in the adhesive properties, there was essentially no difference in the expression of VLA-1, -3, -4, -5, and -6 between resting and stimulated T cells. Together these results suggest that Ag stimulation transmits signals via the TCR complex resulting in a rapid, but transient, up- regulation of matrix protein binding by VLA proteins already present at the cell surface. Because the appropriate reagents that recognize individual mouse VLA proteins were not available, we used the human T cell line Jurkat to demonstrate that T cell binding to collagen, laminin, and fibronectin is mediated largely by VLA-2, VLA-6, and a combination of VLA-5 and VLA-4, respectively.
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