title: The adjuvant effect of a muramyl dipeptide (MDP) analog on temperature-sensitive Salmonella mutant vaccine.
abstract: Adjuvant effect of a synthetic muramyl dipeptide analog, MDP-Lys (L18), MurNAc-L-Ala-D-glu[Lys(CO-(CH2)16-CH3)-OH]NH2 on a live Salmonella enteritidis vaccine, a temperature-sensitive mutant Ts-O strain that was obtained from the virulent S. enteritidis No.11 strain and could not grow at 37 degrees C, but could multiply at 25 degrees C as fast as the parent strain, was examined. Although the Ts-O organisms were avirulent and could hardly multiply in vivo when the organisms were injected into C57BL/6 mice and its mutant beige strain, which has a malfunction of phagocytic cells, injection of these mice with Ts-O endowed them with some protective immunity against infection by the virulent No.11 strain. When MDP-Lys(L18) was injected with Ts-O vaccine, the protection and the bactericidal capacity in the peritoneal cavities and spleens of these mice were augmented. MDP-Lys(L18) was still effective when it was injected at 48 h before or after the inoculation of Ts-O vaccine. Its effect was also observed against infection by the virulent S. cholerae-suis Hokkaido strain, a strain that does not share common O-antigenic determinants with the S. enteritidis No.11 or Ts-O strain. In addition, the mice that were inoculated simultaneously with Ts-O organisms and MDP-Lys(L18) were examined 10 days later for their footpad delayed type hypersensitivity reactions against Ts-O antigen. Mice inoculated with MDP-Lys(L18) and Ts-O showed augmented footpad swelling in comparison with the controls. These findings indicate that MDP-Lys(L18) is capable of augmenting the cellular immunity by live vaccine.
authors.affiliation: Department of Microbiology, Jichi Medical School, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Onozuka
authors.forename: H
authors.initials: H
authors.lastname: Shinomiya
authors.forename: N
authors.initials: N
authors.lastname: Cho
authors.forename: T
authors.initials: T
authors.lastname: Saito-Taki
authors.forename: M
authors.initials: M
authors.lastname: Nakano
mesh_terms: D000119:Acetylmuramyl-Alanyl-Isoglutamine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D001428:Bacterial Vaccines / Q000276:immunology*; D002609:Chediak-Higashi Syndrome / Q000276:immunology; D006968:Hypersensitivity, Delayed; D007111:Immunity, Cellular / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D009154:Mutation; D012477:Salmonella enteritidis / Q000276:immunology*; D013696:Temperature
chemical_list: D001428:Bacterial Vaccines; D000119:Acetylmuramyl-Alanyl-Isoglutamine