title: Isoprinosine as an immunopotentiator in an animal model of human osteosarcoma.
abstract: The effects of isoprinosine (ISO) on the immune responses (Con A-induced lymphocyte proliferation, monocyte chemotactic responsiveness, and "natural killer" cytotoxicity) of normal hamsters and hamsters with human osteosarcoma (OS) were investigated. Human osteosarcoma was induced in newborn inbred hamsters (LHX/SsLAK) after induction of tolerance in utero. In vitro, ISO increased Con A-induced proliferation of peripheral blood lymphocytes (PBL) from normal hamsters by 23.4-48.9% and from OS-bearing hamsters by 58.1-107.4% over controls (Con A alone). When ISO was administered in vivo by intraperitoneal injection. Con A-induced proliferation of PBL from both normal and OS-bearing recipients in vitro was increased by 50-55% at 1, 3 and 5 days after injection. The chemotactic responsiveness of monocytes from OS-bearing hamsters was also significantly increased (59.1-97.4%) at 1, 3 and 5 days after injection of ISO. Natural killer cytotoxicity was augmented at 1, 3 and 5 days after injection of ISO by 31.7-83.6% in normal hamsters and 54.6-184% in OS-bearing hamsters. These results indicate that ISO can produce a generalized enhancement of immune function in hamsters with OS.
mesh_terms: D000276:Adjuvants, Immunologic; D000818:Animals; D002634:Chemotaxis, Leukocyte / Q000187:drug effects; D003208:Concanavalin A / Q000494:pharmacology; D006224:Cricetinae; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D004195:Disease Models, Animal; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D007288:Inosine / Q000031:analogs & derivatives*; D007542:Inosine Pranobex / Q000627:therapeutic use*; D008213:Lymphocyte Activation / Q000187:drug effects; D012516:Osteosarcoma / Q000188:drug therapy* / Q000276:immunology; D011247:Pregnancy; D012513:Sarcoma, Experimental / Q000188:drug therapy
chemical_list: D000276:Adjuvants, Immunologic; D003208:Concanavalin A; D007288:Inosine; D007542:Inosine Pranobex