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The Journal of Immunology, Vol 145, Issue 3 785-793, Copyright © 1990 by American Association of Immunologists
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LS Davis, N Oppenheimer-Marks, JL Bednarczyk, BW McIntyre and PE Lipsky
Harold C. Simmons Arthritis Research Center, University of Texas Southwestern Medical Center, Dallas 75235.
The capacity of purified fibronectin to costimulate human T cell DNA synthesis was examined. Low concentrations of immobilized fibronectin, but not soluble fibronectin, augmented anti-CD3-induced proliferation of highly purified human T cells. In the absence of anti-CD3 stimulation, immobilized fibronectin did not induce T cell proliferation alone or in the presence of IL-2 or phorbol dibutyrate. Although fibronectin is present in high concentrations in the serum, immobilized fibronectin was able to costimulate T cell proliferation when cells were cultured in serum-containing medium. Immobilized collagen type I did not enhance anti-CD3 stimulated T cell responses, whereas gelatin (denatured collagen) and laminin were able to enhance anti-CD3 stimulated T cell responses modestly. The effects of gelatin, however, appeared to be indirect, because it could not enhance responses in medium devoid of fibronectin. Immobilized fibronectin enhanced anti-CD3 induced proliferation of both CD45RA dim and CD45RA bright subsets within both the CD4+ and CD8+ subpopulations of T cells, although cells with the CD45RA dim phenotype were costimulated by lower concentrations of immobilized fibronectin. Enhancement of anti-CD3 induced proliferation by immobilized fibronectin was completely inhibited by a mAb to CD29, the integrin beta 1-chain (4B4) and not by a variety of other mAb. In contrast to its effects on proliferation, 4B4 only partially blocked T cell binding to anti-CD3 and fibronectin- coated macrowells. These findings suggested that the interaction between fibronectin and its receptor transduced a signal to the T cell and did not merely stabilize the interaction between anti-CD3 and the CD3 complex. Further experiments confirmed this observation. Thus fibronectin could enhance anti-CD3 responses when it was immobilized to a separate surface. The augmentation of anti-CD3 stimulated proliferation induced by immobilized fibronectin was also inhibited partially by mAb to either VLA-4 or VLA-5 and completely by a combination of the two mAb. The mAb to VLA-4 not only blocked the capacity of immobilized fibronectin to enhance anti-CD3-induced T cell proliferation but also directly costimulated T cell responses. Thus, at least two fibronectin receptors are involved in fibronectin-mediated costimulation of T cell proliferation. These studies indicate that signals are transduced through the fibronectin receptors, VLA-4 and VLA- 5, that augment T cell responses and therefore implicate the extracellular matrix protein fibronectin as an important influence regulating T cell responsiveness in vivo.
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