Guinea-pigs immunized with rat sarcolemma mixed with Freund's complete adjuvant developed myositic changes such as mononuclear cell infiltration, degeneration of muscle fibers, muscle atrophy including type I and type II muscle fibers, and swelling of motor end-plate. Transient elevation of serum GOT was observed in immunized animals, however, no significant difference was demonstrated between guinea-pigs immunized with rat sarcolemma and with adjuvant alone. The level of serum CPK in these animals was poorly reflected the process of immunization and the pathological changes. Electromyographic studies in immunized guinea-pigs, using direct supra-maximal tetanic stimulation on surgically exposed sciatic nerve, could not demonstrate so-called waning phenomenon of muscle action potentials. Complement fixing anti-rat sarcolemmal antibody was demonstrated in sera of guinea-pigs immunized with rat sarcolemma, but not in sera of guinea-pigs immunized with adjuvant alone. This complement fixing antibody was proved to be specific to rat sarcolemma because of the absence of the cross reactivities with sarcoplasmic reticulum, red cell ghost and liver extract obtained from rat. It was demonstrated that dissolved rat sarcolemma with alkaline water, sodium dodecyl sulfate, sodium deoxycholate or urea, had lost their reactivity with complement fixing antibody, probably due to the modifications of its antigenic structure. Transfer experiments of myositis and delayed type skin reaction to normal guinea-pigs, using the peritoneal exdative cells the lymphnode or spleen cells separated from immunized animals, was not successful yet.
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