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. 1979 Aug;25(2):645–652. doi: 10.1128/iai.25.2.645-652.1979

Mitogenic Effects of Bacterial Cell Walls, Their Fragments, and Related Synthetic Compounds on Thymocytes and Splenocytes of Guinea Pigs

Haruhiko Takada 1, Masachika Tsujimoto 1, Shozo Kotani 1, Shoichi Kusumoto 2, Masaru Inage 2, Tetsuo Shiba 2, Shigeki Nagao 3, Ikuya Yano 4, Shigeo Kawata 5, Kanae Yokogawa 5
PMCID: PMC414493  PMID: 314932

Abstract

Stimulation of [3H]thymidine incorporation of thymocytes and splenocytes from guinea pigs by various bacterial cell walls and their peptidoglycans, by enzymatic digests, and by synthetic muramyl dipeptides was studied as an indication of mitogenic activity. Cell wall and peptidoglycan preparations, isolated from 19 strains belonging to 18 different species, definitely increased [3H]thymidine incorporation of thymocytes as well as splenocytes, regardless of mycolic acid contents as a non-peptidoglycan component. Both the cell walls from Nocardia corynebacteriodes (containing mycolic acids) and those from Streptomyces gardneri (lacking mycolic acids) showed far stronger mitogenic activities on splenocytes than other cell walls (stimulation index, 25 to 30). Furthermore, water-soluble enzymatic digests, notably the endopeptidase digests, which generally were greater in degree of polymerization of peptidoglycan subunits than the glycosidase digests obtained from representative cell walls, were found to have as distinct a stimulating activity on splenocytes as the original cell walls. In contrast, solubilization of the cell walls by enzymes, irrespective of endopeptidases or glycosidases, was accompanied by disappearance of the mitogenic activity on thymocytes. On the other hand, studies with synthetic 6-O-acyl-MurNAc-l-Ala-d-isoGln preparations (6-O-acyl-MDPs) revealed that 6-O-stearoyl-MDP and 6-O-(2-tetradecylhexadecanoyl)-MDP, unlike MDP, had distinct mitogenic activity on thymocytes, whereas their activity on splenocytes was rather weaker than MDP itself. The findings presented here suggest that MDP is the minimal structure for the mitogenic activities of bacterial cell walls on guinea pig splenocytes, but that MDP, though distinctively active by itself, requires a polymerized form to exert effectively its inherent stimulating activities on splenocytes. On the other hand, on thymocytes, MDP, unless it takes a particular form or has appropriate additive groups, cannot exert its mitogenic activities.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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