Abstract
Monoclonal antibodies (McAbs) were raised against Metacyclic Variable Antigen Types (M-VATs) of the AnTAR 1 and ETAR 1 serodemes of Trypanosoma brucei. Two dominant M-VATs, one from each serodeme, were labelled by two of the McAbs using the indirect immunofluorescence technique. These McAbs were of the IgM class, and labelled exposed epitopes on living trypanosomes. They showed lytic activity in vitro towards their respective homologous VAT trypanosomes, both in the presence and absence of complement. In vivo, the McAbs promoted lysis and clearance of trypanosomes from the bloodstream of infected mice. Prevention of reinfection with trypanosomes expressing the same VAT was conferred by the McAbs.
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