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The effect on respiratory burst of splenic cells from mice pretreated with oil-in-water emulsions of muramyl dipeptide (MDP), trehalose dimycolate (TDM), or the combination of MDP with TDM was studied by luminol-dependent chemiluminescence in response to stimulation by zymosan. Spleen cells from mice pretreated with TDM, but not those of mice treated with MDP, generated increased chemiluminescence. Spleen cells from animals pretreated with the combination of MDP and TDM exhibited markedly enhanced chemiluminescence activity. The effect of enhanced activity of preparations containing MDP combined with TDM was further examined in vivo by an aerosol infection of pretreated mice with a mouse-pathogenic influenza virus. Pretreatment with 6-O-acyl analogs and one ubiquinone derivative of MDP alone did not induce any resistance against influenza virus. Significant protection was conferred only when MDP and certain analogs were combined with TDM. The enhancement of nonspecific resistance to influenza virus infection was related to the chemical structure of the synthetic immunostimulant. A greater degree of protection was induced by the combination of TDM with the lipophilic derivatives like B 30-MDP and L-18 MDP.

infection and immunity

Stimulation of chemiluminescence and resistance against aerogenic influenza virus infection by synthetic muramyl dipeptide combined with trehalose dimycolate