title: Study of the in vivo priming effect of interferon in mice.
abstract: Intramuscular injection of mice with 2000 IU/g partially purified murine interferon (IFN) alpha/beta 3 h before the induction of IFN by intraperitoneally administered 3 micrograms/g poly rI:rC enhanced early IFN production. The differences between the serum IFN levels of IFN-pretreated and control animals were about 10-fold during the first 2 to 3 h of in vivo IFN production. In later stages these differences tended to decrease, and from 8 h post-induction they disappeared. IFN exerted its in vivo priming activity equally after intravenous, intraperitoneal or intramuscular injection. A similar enhancement of IFN production was observed when it was induced by poly rI:rC administered either intraperitoneally or intramuscularly. The duration of IFN pretreatment influenced the establishment of the in vivo primed state. Following administration of 2000 IU/g murine IFN alpha/beta intramuscularly, maximal priming developed after 3 h, and no primed IFN response was detected when the inoculation of IFN preceded inducer administration by 12 h or more. The manifestation of in vivo priming was optimal when 1500 to 3000 IU/g pretreating doses of IFN were applied. Reduction of the amount of injected IFN below this level markedly decreased priming, indicating a time- and dose-dependent induction of priming in vivo.
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D007273:Injections, Intramuscular; D007274:Injections, Intraperitoneal; D007275:Injections, Intravenous; D007370:Interferon Type I / Q000008:administration & dosage / Q000096:biosynthesis / Q000378:metabolism / Q000494:pharmacology*; D007700:Kinetics; D007739:L Cells; D008297:Male; D051379:Mice; D011070:Poly I-C / Q000008:administration & dosage / Q000494:pharmacology
chemical_list: D007370:Interferon Type I; D011070:Poly I-C