title: Isoprinosine as an immunopotentiator.
abstract: Isoprinosine is a compound developed for antiviral use. The effects of isoprinosine on mouse responses to sheep red blood cells were studied over a wide range of doses, from 0.5 microgram/kg to 5 g/kg, i.p. administered at the time of i.v. immunization or as pretreatment for 7 days before antigenic stimulus. Low doses, 50 microgram/kg to 50 mg/kg, significantly increased the numbers of IgM- or IgG-spleen antibody-forming cells. Large doses, such as the LD50 (5 g/kg) or pretreatments where unable to impair mouse immune responsiveness. Isoprinosine (< 500 mg/kg/day) orally administered at time of or one day after immunization stimulated immune responses. In vitro addition of isoprinosine to spleen lymphocytes augmented PHA- or Con A-induced proliferation over a concentration range from 10 to 150 microgram/ml, whereas isoprinosine had no effect in the absence of mitogens. These data, and the lack of immunodepressing effect, suggest that there is a need for further evaluation of isoprinosine as an immunopotentiator.
mesh_terms: D000276:Adjuvants, Immunologic; D000818:Animals; D000921:Antibody-Producing Cells / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D004247:DNA / Q000096:biosynthesis; D007288:Inosine / Q000031:analogs & derivatives*; D007542:Inosine Pranobex / Q000494:pharmacology*; D051379:Mice; D008809:Mice, Inbred C3H; D009929:Organ Size / Q000187:drug effects; D012756:Sheep / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000187:drug effects
chemical_list: D000276:Adjuvants, Immunologic; D007288:Inosine; D004247:DNA; D007542:Inosine Pranobex