title: Association of CD2 and CD45 on human T lymphocytes.
abstract: At least two membrane receptors have been defined through which human T lymphocytes can be induced to proliferate and differentiate, namely the CD3-Ti antigen receptor complex and the CD2 molecule. Monoclonal antibodies directed at either CD2 or CD3 induce intracellular second messenger production and subsequent protein phosphorylation. On most human non-B lymphocytes, CD3-Ti and CD2 are coexpressed and seem to be functionally interrelated. But there are minor subpopulations in which these receptor systems can transduce signals despite a mutually exclusive expression, indicating that CD3-Ti and CD2 can act independently of each other. This view is supported by the finding that most monoclonal antibodies directed at the CD45 molecules are strongly co-mitogenic with CD2 but not CD3 monoclonal antibodies. As the intracytoplasmic domains of CD45 have tyrosine phosphatase activity these functional effects could be explained by a physical association between CD2 and CD45. Using chemical crosslinking techniques, we now show that CD45 is linked to CD2 on the surface of human T lymphocytes.
authors.affiliation: Abteilung Angewandte Immunologie, Deutsches Krebsforschungszentrum, Heidelberg, FRG.
authors.forename: B
authors.initials: B
authors.lastname: Schraven
authors.forename: Y
authors.initials: Y
authors.lastname: Samstag
authors.forename: P
authors.initials: P
authors.lastname: Altevogt
authors.forename: S C
authors.initials: SC
authors.lastname: Meuer
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015703:Antigens, CD / Q000276:immunology*; D000943:Antigens, Differentiation / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology*; D018801:CD2 Antigens; D017252:CD3 Complex; D003432:Cross-Linking Reagents / Q000494:pharmacology; D004797:Enzyme-Linked Immunosorbent Assay; D006649:Histocompatibility Antigens / Q000276:immunology*; D015395:Histocompatibility Antigens Class I / Q000276:immunology; D006801:Humans; D007163:Immunosorbent Techniques; D017493:Leukocyte Common Antigens; D008970:Molecular Weight; D010446:Peptide Fragments; D010749:Phosphoprotein Phosphatases / Q000378:metabolism; D010750:Phosphoproteins / Q000378:metabolism; D010766:Phosphorylation; D017027:Protein Tyrosine Phosphatases; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D011971:Receptors, Immunologic / Q000276:immunology*; D015290:Second Messenger Systems; D012697:Serine Endopeptidases; D013388:Succinimides / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D017252:CD3 Complex; D003432:Cross-Linking Reagents; D006649:Histocompatibility Antigens; D015395:Histocompatibility Antigens Class I; D010446:Peptide Fragments; D010750:Phosphoproteins; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D013388:Succinimides; D010749:Phosphoprotein Phosphatases; D017493:Leukocyte Common Antigens; D017027:Protein Tyrosine Phosphatases; D012697:Serine Endopeptidases; C028344:glutamyl endopeptidase; C011240:dithiobis(succinimidylpropionate)