Abstract
Gametocytes of Plasmodium yoelii were incubated with colchicine, vinblastine sulphate and cytochalasin B and then induced to undergo gametogenesis. All the drugs inhibited gamete formation in a dose and time dependent manner. Electron microscopy revealed that colchicine and vinblastine sulphate inhibited the polymerisation of cytoplasmic- axonemal- and intranuclear mitotic- microtubules. Cytochalasin B did not inhibit microtubule assembly but blocked spindle pole separation and axoneme distribution into the microgamete. All drugs prevented escape of the gametocyte from the erythrocyte. The mechanism of mitotie spindle action is discussed.
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