Abstract
This paper describes in vitro antibody dependent cytotoxicity against Trypanosoma cruzi epimastigotes by normal mouse splenic lymphocytes. Cytotoxicity was expressed as the percentage reduction in the number of motile parasites upon incubation with lymphocytes at 37 degrees C in a defined medium. Failure of the non-motile parasites to regain motility and their ensuing degeneration of 28 degrees C in liver infusion tryptose (LIT) medium confirmed loss of motility as a criterion of cytotoxicity. Incubation of T. cruzi cruzi at 37 degrees C for 18 h in a defined medium per se did not interfere with motility but was followed by a lag phase of the growth curve in LIT medium at 28 degrees C. The lag phase was prolonged for T. cruzi which had previously been incubated at 37 degrees C in the absence of cells.
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