Abstract
Cell walls isolated from four bacterial species (Streptococcus pyogenes, Lactobacillus plantarum, Streptomyces gardneri, and Nocardia corynebacteriodes), which exhibited the adjuvant effect of stimulating cellular and humoral immune responses against ovalbumin in guinea pigs, caused the slow-starting and long-lasting contraction of guinea pig ileal strips suspended in Tyrode solution. In contrast to these cell walls active in immunoadjuvancy, those isolated from five bacterial species (Micrococcus lysodeikticus, Staphylococcus epidermidis, Arthrobacter atrocyaneus, Corynebacterium insidiosum, and Ampullariella regularis), which lacked immunoadjuvancy at least in intact walls, caused no or very weak contraction of the ileal strips. Further study demonstrated that both a monomer and a polymer of disaccharide-stem peptides, which were obtained by enzymatic degradation of S. epidermis cell wall peptidoglycans, displayed similar contractile effects. It was finally revealed that guinea pig ileum strips showed a definite contractile response to N-acetylmuramyl-L-alanyl-D-isoglutamine (MDP) and 6-O-stearoyl- and 6-O-(2-tetradecylhexadecanoyl)-MDPs, but not to their analogs, whose C-terminal amino acid was L-isoglutamine or D-isoasparagine in place of D-isoglutamine and which lacked adjuvancy. 6-O-(3-Hydroxy-2-docosylhexacosanoyl)-MDP, on the other hand, caused a slow and lasting relaxation of the ileum strips, but its L-isoglutamine and D-isoasparagine analogs did not.
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Selected References
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