title: Selective cytotoxicity of two rodent T cell lymphomas to rat yolk sac tumours involves a retroviral envelope protein expressed by the lymphoma.
abstract: A Gross virus induced rat T cell lymphoma G1-Tc1 and a Moloney virus induced mouse T cell lymphoma YAC-1 are shown to exert a strong cytotoxic activity against rat yolk sac tumours but not to various types of rat, mouse or human normal cells or tumour cell lines including carcinomas, sarcomas, lymphomas and gliomas. Both lymphomas are CD3+, CD4-, CD8- and T-cell receptor (TCR) alpha beta +. The cytotoxicity was not MHC restricted or dependent on the density of MHC class I of the target cells, and the mouse lymphoma killed the rat yolk sac tumour target. The cytotoxic action was fast and up to 80% specific killing was observed in 4-h 51Cr release assays. A rat B cell hybridoma was established from a Wistar/Furth (WF) rat immunized with the syngeneic lymphoma G1-Tc1 producing an immunoglobulin (Ig)G2c monoclonal antibody (MoAb) 1F2. This binds to the lymphomas G1-Tc1 and YAC-1 and also to a murine non-cytolytic Rauscher lymphoma RMA, but not to any other of several rat, mouse or human cell types tested. The 1F2 completely inhibited the killing of rat yolk sac tumours by the two cytolytic lymphomas, but did not interfere with the killing mediated by natural killer (NK) cells or cytolytic lymphokine-activated killer (LAK) cells. Immunochemical analysis of solubilized cell membranes of the lymphoma G1-Tc1 demonstrates that the 1F2 antibody recognizes an epitope on a retroviral gp 70 envelope protein. This indicates that a retroviral protein is involved in the lytic activity of the two lymphomas.
authors.affiliation: Department of Tumor Immunology, Wallenberg Laboratory, Lund University.
authors.forename: M
authors.initials: M
authors.lastname: Lindvall
authors.forename: H
authors.initials: H
authors.lastname: Eriksson
authors.forename: G
authors.initials: G
authors.lastname: Hedlund
authors.forename: H O
authors.initials: HO
authors.lastname: Sjögren
mesh_terms: D000406:AKR murine leukemia virus / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000494:pharmacology; D002460:Cell Line; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D018240:Endodermal Sinus Tumor / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D006801:Humans; D016399:Lymphoma, T-Cell / Q000276:immunology* / Q000821:virology; D008565:Membrane Proteins / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D051379:Mice; D008979:Moloney murine leukemia virus / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D009363:Neoplasm Proteins / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D014411:Neoplastic Stem Cells / Q000276:immunology*; D051381:Rats; D011920:Rats, Inbred WF; D015682:Retroviridae Proteins, Oncogenic / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D014759:Viral Envelope Proteins / Q000235:genetics / Q000276:immunology / Q000502:physiology*
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D008565:Membrane Proteins; D009363:Neoplasm Proteins; D015682:Retroviridae Proteins, Oncogenic; D014759:Viral Envelope Proteins