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Differential Sensitivity of Macrophages from Herpes Simplex Virus-resistant and -susceptible Mice to Respiratory Burst Priming by Interferon-/

Institute of Medical Microbiology, University of Aarhus, DK-8000 Aarhus C, Denmark

Herpes simplex virus primes mouse macrophages for a genetically determined respiratory burst mediated in an autocrine manner by interferon (IFN)-/. We have analysed the effect of IFN-/ on the respiratory burst capacity of mouse peritoneal macrophages by luminol-dependent chemiluminescence using phorbol myristate acetate as trigger. Crude macrophage-produced IFN-/ as well as purified IFN- and - regularly augmented the respiratory burst capacity of peritoneal cells in a concentration-dependent manner. The augmented response was exclusively mediated by macrophages and was manifest after 4 h incubation with IFN-/, peaked after 8 h and gradually declined to near background levels after 24 h. The effect of macrophage-produced IFN-/ was completely abolished by preincubation of IFN with antiserum to IFN-/. The data obtained with this antiserum indicated that endogenous IFN, undetectable by a standard cytopathic effect-inhibition assay, was sometimes spontaneously produced by the peritoneal cells. Furthermore, the crude macrophage preparation seemed to contain a macrophage deactivating factor counteracting the effect of IFN-/. Genetic analysis of the sensitivity of macrophages for the respiratory burst-priming effect of IFN-/ revealed that the trait is inherited as a co-dominant autosomal feature. Macrophages from herpes simplex virus-resistant C57BL/6 mice were more sensitive than macrophages from virus-susceptible BALB/c mice and cells from mice of the reciprocal crosses showed an equal sensitivity intermediate between those of the parental strains. A physiological role of differential IFN sensitivity in the context of resistance to virus infections is suggested.

Keywords: HSV, macrophages, interferon (MuIFN-/)

Received 28 September 1988; accepted 10 April 1989.

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