B Haacke-Bell

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More than 1000 secretory organelles (trichocysts) are docked at the plasma membrane of Paramecium cells. After stimulation, the trichocyst contents are expelled as needle-like structures in an exocytotic response. Neither the function nor the natural stimulus of trichocyst exocytosis are known in this well established system. Several hypotheses have been(More)
Possible function(s) proposed in the literature for Paramecium trichocysts have been controversial for a long time. The oldest hypothesis, defence against protozoan predators, has now obtained support from experiments with Dileptus as well as by our observation of a vigorous lateral displacement of cells due to synchronous, massive local trichocyst(More)
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