Enhancement of CD2-mediated T cell activation by the interaction of VLA-4 with fibronectin.
Human fibroblasts were shown to enhance the proliferation of peripheral T cells in the presence of suboptimal concentrations of anti-CD2 antibodies (anti-T112 and anti-T113) and agonistic anti-VLA-4 antibody. Evidence is provided that the interaction of VLA-4 with immobilized fibronectin can enhance the proliferation of T cells subjected to suboptimal stimulation via CD2. Our results suggest that the fibroblast-stimulated T cell proliferative response to low doses of anti-T112 and T113 antibodies is due to the interaction of VLA-4 with fibroblast fibronectin. These findings also suggest a role for the fibronectin/VLA-4 interaction in the inflammatory process.
Institute for Arthritis and Autoimmunity, Miles Research Center, West Haven, Connecticut 06516.
M L
ML
Blue
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Conrad
G
G
Davis
K A
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Kelley
D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000502:physiology*; D018801:CD2 Antigens; D005353:Fibronectins / Q000502:physiology*; D006801:Humans; D008213:Lymphocyte Activation; D011948:Receptors, Antigen, T-Cell / Q000502:physiology; D011971:Receptors, Immunologic / Q000502:physiology*; D016029:Receptors, Very Late Antigen / Q000502:physiology*; D013601:T-Lymphocytes / Q000276:immunology*
D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D005353:Fibronectins; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D016029:Receptors, Very Late Antigen