title: Inhibition of in vitro Friend murine leukemia virus infection of lipopolysaccharide-activated B-cells with concanavalin A.
abstract: Stimulation with bacterial lipopolysaccharide (LPS) of splenic B-lymphocytes infected in vitro with Friend virus complex increased the number of cells with replicating murine leukemia virus (MuLV) [i.e., infectious centers (IC)] up to 100-fold. Concanavalin A (Con A) did not have such an effect. However, the addition of Con A to the LPS-stimulated cultures decreased the number of IC. The inhibitory concentration of Con A (2.5 microgram/ml) was eightfold less than that capable of neutralizing the in vitro infectivity of MuLV (20 microgram/ml). The effect of Con A was not mediated by T-cells; the inhibition of infection was comparable with use of whole spleen cell suspensions from normal BALB/c mice, with T-cell-depleted cell suspensions, or with spleen cells with congenitally athymic nude mice. However, specific removal of Con A from the surface of B-cells with alpha-methyl-D-mannopyranoside prior to the infection reversed the inhibitory effect entirely. It is suggested that the lectin interferes with MuLV on the membrane of B-cells.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002462:Cell Membrane / Q000276:immunology; D002471:Cell Transformation, Neoplastic; D003208:Concanavalin A / Q000494:pharmacology*; D005260:Female; D005622:Friend murine leukemia virus; D066298:In Vitro Techniques; D008070:Lipopolysaccharides / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000276:immunology; D014779:Virus Replication
chemical_list: D008070:Lipopolysaccharides; D003208:Concanavalin A