Local trichocyst exocytosis provides an efficient escape mechanism for Paramecium cells
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Cited by (55)
Maturing secretory granules: Where secretory and endocytic pathways converge
2021, Advances in Biological RegulationCitation Excerpt :Regulated secretion is used by both predatory and prey ciliates. Many predatory ciliates use regulated secretion to release compounds that immobilize prey ciliates, whereas prey ciliates react by releasing compounds that nullify the attack (Harumoto and Miyake, 1991; Knoll et al., 1991; Wessenberg and Antipa, 1970). SGs in Tetrahymena thermophila are termed mucocysts, and each individual contains hundreds of ellipse-shaped mucocysts that are roughly 0.6 μm2 in cross-sectional surface area (Turkewitz, 2004).
Calcium signalling in the ciliated protozoan model, Paramecium: Strict signal localisation by epigenetically controlled positioning of different Ca<sup>2+</sup>-channels
2015, Cell CalciumCitation Excerpt :Therefore, normally no Ca2+ flux from the cilium into the cell soma occurs. However, a remarkable Ca2+ spillover into cilia does occur during massive synchronous exocytosis stimulation, thus enforcing escape from predator attacks [83]. Hereby depolarisation as a trigger is bypassed.
Ultrastructure of trichocysts in Hematodinium spp. infecting Atlantic snow crab, Chionoecetes opilio
2014, Journal of Invertebrate PathologyCitation Excerpt :Upon entry into the suitable host, the dinospore may attach to the hepatopancreas, possibly through the extrusion of trichocysts, and quickly transition into a non-motile vegetative trophont. In Paramecium, trichocysts may be simultaneously extruded when chemically induced or when encountering a predator (Plattner et al., 1984; Zieseniss and Plattner, 1985; Knoll et al., 1991; Harumoto, 1994). Trichocysts of Hematodinium spp. may similarly be expelled synchronously and attach to the host hepatopancreas or other organs.
Calcium signaling in closely related protozoan groups (Alveolata): Non-parasitic ciliates (Paramecium, Tetrahymena) vs. parasitic Apicomplexa (Plasmodium, Toxoplasma)
2012, Cell CalciumCitation Excerpt :This recalls triggering of trichocyst exocytosis by contact with a predatory cell in Paramecium [77,78]. An essential difference is that, in Apicomplexa, material from the micronemes mediates intense contact [68,198] (Section 6.1), whereas trichocysts keep attacking predatory cells at a distance [78]. The Ca2+ requirement for host cell penetration was originally derived from increased host cell interaction during Ca2+ ionophore treatment [68].
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Helmut Plattner, Universität Konstanz, Fakultät für Biologie, Postfach 5560, 7750 Konstanz, Germany