Abstract
Female C 3 H HeJ or CD-1 mice were infected with a sublethal dose of murine cytomegalovirus (MCMV) and then exposed to nickel chloride (NiCl 2) or cadmium chloride (CdCl 2) intramuscularly (im) or by inhalation. Effects of these treatments on disease susceptibility, virus-augmented and spontaneous natural killer (NK) cell activity, and virus induction of interferon (IFN) were determined. NiCl 2 (20 mg/kg, im) enhanced mortality due to MCMV in both mouse strains, and a reduction in virus-augmented NK cell activity was seen at doses as low as 10 mg NiCl 2/kg im. At 6.25 mg CdCl 2/kg im there was a significant depression of NK cell activity, but there was no effect on mortality due to infection. Effects on NK activity did not appear to be due to effects on IFN production since neither of the metal treatments caused depression of this response. Neither metal when given by inhalation had any effect on these parameters.
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