T-cells inhibit Friend murine leukemia virus infection of B-cells in vitro.
The ability of splenic T-cells to regulate Friend murine leukemia virus replication in lipopolysaccharide-activated target B-cells infected in vitro was investigated. Removal of the T-cell fraction from spleen cells resulted in an 8- to 10-fold enhancement in the number of productively infected cells in the remaining B-cell-enriched fraction, as compared with unseparated spleen cells, and the addition of increasing numbers of purified T-cells to isolated B-cells prior to infection resulted in a directly proportional reduction in the number of B-cells releasing infectious progeny virus. Separation of splenic T-cells into Lyt 2- and Lyt 2+ T-cells before addition to infected B-cell cultures resulted in inhibition of infection only with the Lyt 2- T-cells; Lyt 2+ T-cells did not inhibit infection, even at high 1:1 ratios. Similarly, separation of splenic T-cells into L3T4+ and L3T4- T-cells before addition resulted in inhibition by L3T4+ but not L3T4- T-cells. Also, cytotoxic treatment of splenic T-cells with monoclonal anti-L3T4 antibody and complement before addition to B-cell cultures destroyed the regulatory effects. Finally, depletion of macrophages from both T-cells and B-cells before infection and coculture had no effect on the ability of T-cells to regulate B-cell infection. Collectively these results demonstrate that L3T4+ T-cells can inhibit Friend murine leukemia virus replication in target B-cells. Culture of isolated splenic T-cells with Friend murine leukemia virus in vitro resulted in the induction of alpha/beta but not interferon-gamma synthesis and in some experiments interferon-containing supernatants from T-cell-virus cultures were able to mediate suppression of B-cell infection with Friend helper virus; the addition of antibody specific for interferon-alpha/beta to cultures inhibited the ability of T-cells to regulate B-cell infection.
Isaak
D D
DD
Department of Molecular Biology, University of Wyoming, Laramie 82071.
Fleischmann
R
R
Cerny
J
J
D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D000950:Antigens, Ly / Q000032:analysis; D001402:B-Lymphocytes / Q000382:microbiology*; D002478:Cells, Cultured; D005622:Friend murine leukemia virus / Q000254:growth & development*; D007372:Interferons / Q000502:physiology; D008070:Lipopolysaccharides / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D013601:T-Lymphocytes / Q000145:classification / Q000502:physiology*; D014779:Virus Replication
D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D008070:Lipopolysaccharides; D007372:Interferons