title: Modulation of the growth of murine thymoma cell lines having different Lyt-phenotypes by MDP and MDP(D-D): macrophage-mediated inhibition of in vitro cell growth.
abstract: The ability of N-acetylmuramyl-L-alanyl-D-isoglutamine (MDP) and its adjuvant-inactive stereoisomer, N-acetylmuramyl-D-alanyl-D-isoglutamine, (MDP(D-D] to inhibit the in vitro growth of 3 murine ascitic thymoma lines, expressing different Lyt-phenotypes, was studied. MDP inhibited the growth of all 3 cell lines. MDP(D-D) inhibited the 2 cell lines expressing Lyt-1+2- or Lyt-1+2+ phenotypes, but not the third cell line which expressed the Lyt-1-2+ phenotype. The ability of MDP or MDP(D-D) to inhibit thymoma growth was lost when the ascitic cell populations were depleted of macrophages. MDP could be replaced by a supernatant derived from an ascitic Lyt-1+2- cell population exposed to MDP. The supernatant required the presence of macrophages for activity. The inhibition by MDP of the growth of the Lyt-1-2+ cell line was prostaglandin synthetase dependent: indomethacin antagonized the inhibitory activity of MDP. The inhibition by MDP of the Lyt-1+2- cell line was partially antagonized by indomethacin, and no antagonism was observed with the Lyt-1+2+ cell line.
mesh_terms: D000119:Acetylmuramyl-Alanyl-Isoglutamine / Q000494:pharmacology*; D000818:Animals; D000950:Antigens, Ly; D002460:Cell Line; D004247:DNA / Q000096:biosynthesis; D005260:Female; D006131:Growth Inhibitors / Q000494:pharmacology*; D007213:Indomethacin / Q000494:pharmacology; D008262:Macrophage Activation / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D010641:Phenotype; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*; D013936:Thymidine / Q000378:metabolism; D013945:Thymoma / Q000276:immunology* / Q000378:metabolism / Q000628:therapy; D013953:Thymus Neoplasms / Q000276:immunology* / Q000378:metabolism / Q000628:therapy
chemical_list: D000950:Antigens, Ly; D006131:Growth Inhibitors; D000119:Acetylmuramyl-Alanyl-Isoglutamine; D004247:DNA; D013936:Thymidine; D007213:Indomethacin