title: Human CD4 helper T cell activation: functional involvement of two distinct collagen receptors, 1F7 and VLA integrin family.
abstract: In the present study, we showed that activation of human CD4 T cells can be induced by anti-CD3 and collagen in a serum-free system. This activation was inhibited by the addition of peptides containing the RGD or Gly-Pro-X sequences. Significantly, we demonstrated that both the 1F7 (CD26) structure and the VLA integrin family, particularly the VLA-3 complex, contribute to the functional interaction between collagen and CD4 cells since anti-1F7 and anti-VLA-3 specifically inhibited this collagen-induced CD4 cell activation. Biochemical studies showed that the 1F7 structure is not a member of the VLA integrin family. These results thus indicated that two different families of antigens serve as functional collagen receptors for CD4 T cell activation.
authors.affiliation: Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115.
authors.forename: N H
authors.initials: NH
authors.lastname: Dang
authors.forename: Y
authors.initials: Y
authors.lastname: Torimoto
authors.forename: S F
authors.initials: SF
authors.lastname: Schlossman
authors.forename: C
authors.initials: C
authors.lastname: Morimoto
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D017252:CD3 Complex; D015704:CD4 Antigens / Q000276:immunology*; D002478:Cells, Cultured; D003094:Collagen / Q000494:pharmacology; D006801:Humans; D016023:Integrins / Q000276:immunology*; D008213:Lymphocyte Activation / Q000187:drug effects; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D011956:Receptors, Cell Surface / Q000276:immunology*; D038981:Receptors, Collagen; D016029:Receptors, Very Late Antigen / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000187:drug effects / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D015704:CD4 Antigens; D016023:Integrins; D011948:Receptors, Antigen, T-Cell; D011956:Receptors, Cell Surface; D038981:Receptors, Collagen; D016029:Receptors, Very Late Antigen; D003094:Collagen