title: I-Ad antigen expression of pyran copolymer-induced peritoneal cells in tumor vaccine-primed mice and its association with the host antitumor response.
abstract: Mice inoculated IP with L1210 murine leukemia vaccine and subsequently with pyran copolymer-induced macrophages (pyran-M phi) lived for a prolonged time after live L1210 inoculation IP. Pyran-M phi as tentatively identified by anti-AcM.1 monoclonal antibody expressed I-Ad antigen in tumor vaccine-primed recipient mice and contributed to maintaining I-Ad antigen positive (I-Ad+) macrophages at high cell density in the peritoneal cavity of recipient mice. The relevance of these I-Ad+ cells to the host antitumor response was examined by experiments in which I-Ad+ cell density in the peritoneal cavity and host antitumor response behaved in a parallel fashion. Human interferon-alpha A/D, an agent selectively inhibiting Ia antigen expression, and silica, a general antimacrophage agent, strongly suppressed I-Ad antigen expression of peritoneal macrophages of tumor vaccine-primed and pyran-M phi-inoculated mice and, consistently with this, the antitumor response was nullified in these mice. Tumor vaccine-primed mice inoculated with sodium caseinate or thioglycollate-induced peritoneal cells did not survive L1210 inoculation and, in these mice, I-Ad+ peritoneal macrophages were suppressed in number as compared with those of tumor vaccine-primed and pyran-M phi-inoculated mice. These results warrant further study on the contribution of I-Ad+ macrophages to pyran copolymer-induced augmentation of the antitumor response in tumor vaccine-primed mice.
mesh_terms: D000818:Animals; D003602:Cytotoxicity, Immunologic; D005802:Genes, MHC Class II; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D007167:Immunotherapy; D007939:Leukemia L1210 / Q000276:immunology* / Q000628:therapy; D008264:Macrophages / Q000187:drug effects / Q000276:immunology*; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D008815:Mice, Inbred Strains; D011108:Polymers / Q000494:pharmacology*; D011713:Pyran Copolymer / Q000494:pharmacology*; D014612:Vaccines / Q000008:administration & dosage*
chemical_list: D000949:Histocompatibility Antigens Class II; D011108:Polymers; D014612:Vaccines; D011713:Pyran Copolymer