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A synthetic adjuvant, N-acetylmuramyl-L-alanyl-D-isoglutamine (MDP), failed to produce polyarthritis with a wide dose range in a water-in-oil emulsion of mineral oil such as liquid paraffin, Drakeol, or heavy mineral oil. MDP, however, produced moderate to severe arthritis with almost 100% incidence in a water-in-oil emulsion made up of Difco incomplete adjuvant, which consists of Bavol F as an oil vehicle and Arlacel A as an emulsifier. N-acetylmuramyl-L-alanyl-L-isoglutamine did not produce arthritis, whereas 4,6-diacetyl-MDP produced the disease. Bacterial peptidoglycans, such as disaccharide peptides which were N-acetylglucosaminyl-N-acetylmuramyl-L-alanyl-D-isoglutaminyl-meso-diaminopimelyl-D-alanine and N-acetylglucosaminyl-6,o-acetyl-N-acetylmuramyl-L-alanyl-D-isoglutaminyl-meso-diaminopimelyl-D-alanine, also produced polyarthritis with low incidence in Difco oil but not in the other mineral oils described above. MDP and bacterial disaccharide peptides were able to produce the disease even in the latter mineral oil only when the concentration of Arlacel A was increased from 15% to 20 to 30% in the oil. We concluded that one of the minimal essential structures responsible for development of this disease is MDP, although the role of the oil vehicle remained uncertain, and there is no direct correlation between granulona formation and arthritogenicity of MDP.

infection and immunity

Arthritis-inducing ability of a synthetic adjuvant, N-acetylmuramyl peptides, and bacterial disaccharide peptides related to different oil vehicles and their composition