Abstract
Lines of mouse-human hybrid cells segregating either mouse or human chromosomes were used for the analysis of various aspects of the production and actions of mouse and human interferons. In one of the hybrid cell lines capable of producing both mouse and human interferons, the proportion of the two interferon activities produced varied greatly under different inducing conditions, suggesting that there are differences in the triggering mechanisms of the two interferons. Generally both mouse and human interferon production could be enhanced (“superinduced”) by sequential treatment with cycloheximide and actinomycin D; however, in one of the lines producing both mouse and human interferon, only the latter could be superinduced. There was no correlation between the capacity of the lines to produce mouse or human interferons and the sensitivity to their action. However, there was good correlation between the sensitivity to the antiviral action and the priming action (i.e., enhancement of subsequent interferon production) by the two interferons. Thus, line 55-91F2 produced both mouse and human interferons, but was sensitive to the antiviral and priming actions of human interferon only. Line GM52 × BalbVC15 produced only mouse interferon but was sensitive to the antiviral and priming actions of both interferons.
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