Effects of concanavalin A on the antiviral and cell growth inhibitory action of human interferons.
Sensitivities of human transformed cell line RSa and its variant cell line IFr to the cytotoxicity of Con A were compared. IFr cells were more resistant than RSa to Con A. Con A-resistant cell lines, Con Ar-1 and Con Ar-3, were isolated from RSa, and they were slightly more sensitive than RSa cells to the cell growth-inhibitory actions of interferons. Agglutinability of RSa, IFr, and Con Ar cells by Con A was compared and found to be almost equal. The combined effects of Con A and interferon upon growth and viability of these cell lines were tested. When RSa and IFr cells were treated simultaneously with Con A and Le-IF, growth of the cells was suppressed more markedly than when treatment was with Con A or Le-IF alone. To clarify the mechanism of this phenomenon, binding of 125I-labeled Con A was examined. Though ther wee some differences, both leukocyte and fibroblast interferon enhanced the binding of Con A to RSa cells and also in Con Ar cells but, in interferon-resistant IFr and HEC cells, enhancement of Con A binding was low or not observed. Therefore, the combined effect of Con A and interferon on the inhibition of cell growth is not considered to be merely due to the enhanced binding of Con A by interferon action. Successive treatment of RSa or Con Ar cells with Con A and interferon did not enhance the antiviral action of interferon at all. On the contrary, simultaneous treatment with Con A and interferon suppressed the antiviral action of interferon, depending on the concentration of Con A used. Thus, the effect of Con A on the antiviral and cell growth-inhibitory actin of interferon seems rather different.
D002449:Cell Aggregation; D002455:Cell Division / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D002471:Cell Transformation, Neoplastic; D003208:Concanavalin A / Q000494:pharmacology*; D004351:Drug Resistance; D006801:Humans; D007372:Interferons / Q000494:pharmacology*; D014721:Vesicular stomatitis Indiana virus / Q000276:immunology; D014779:Virus Replication / Q000187:drug effects*
D003208:Concanavalin A; D007372:Interferons