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The mode of function of the cyto pharyngeal basket of the ciliate pseudomicrothorax dubius


, : The mode of function of the cyto pharyngeal basket of the ciliate pseudomicrothorax dubius. Differentiation 14(3): 147-158

The ciliate P. dubius feeds on filamentous blue-green algae, ingesting them at rates of up to 15 .mu.m/s, by a cytopharyngeal basket. The wall of the basket is composed of 22 .+-. 3 nemadesmata, each of which is a bundle of .apprx. 200 microtubules which are cross-linked in a hexagonal pattern. The lumen of the non-feeding basket is filled with cytoplasma into which project the nemadesmal lamellae. Each nemadesmal lamella is attached to a nemadesm and consists of a single row of 20-30 microtubules. Each microtubule of the nemadesmal lamella bears a row of pairs of arm-like projections which are embedded in a filamentous matrix. During feeding, the lumen of the basket is occupied by the developing food vacuole. The nemadesmal lamellae are observed between the vacuole membrane and the nemadesmata, and the arms of the nemadesmal lamellae microtubules are oriented toward the membrane of the food vacuole or of small vesicles. A mechanism for the generation of force for phagocytosis by the microtubule arms is proposed. During food uptake the membrane of the food vacuole increases rapidly at rates up to 270 .mu.m2/ s. Vacuole growth results from the fusion of membrane-bound vesicles. During phagocytosis a fast streaming of these vesicles can be observed in the cytoplasm surrounding the basket. The direction of streaming is opposite to that of ingestion of the algal filament. The vesicles enter the lumen of the basket at its anterior end, in a zone where the wall of the basket is perforated.


Accession: 006719420

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Related references

Hauser, M.; Hausmann, K., 1982: Electron microscopic localization of ATPase activity in the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. The cytopharyngeal basket of Pseudomicrothorax dubius is used to ingest filamentous blue-green algae. The basket has three main components: a sheath of microfilaments, bundles of microtubules (the nemadesmata), and ribbons of microtubules. The rib...

Hausmann, K.; Peck, R.K., 1978: Microtubules and microfilaments as major components of a phagocytic apparatus: the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. The cytopharyngeal basket of Pseudomicrothorax dubius, through which filamentous blue-green algae are ingested, consists of 22 (+/- 3) nemadesmata and nemadesmal lamellae, in the form of a tube. A cytostome, delimited by the cell membrane and surr...

Hauser, M.; Hausmann, K.; Jockusch, BM., 1980: Demonstration of tubulin, actin and -actinin by immunofluorescence in the microtubule-microfilament complex of the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. The feeding organelle (cytopharyngeal basket) of the ciliate P. dubius contains a highly complex pattern of microtubular lattices closely associated with microfilamentous web-like material. Indirect immunofluorescence microscopy on cell ghosts and...

Hauser, M.; Hausmann, K.; Jockusch, B.M., 1980: Demonstration of tubulin, actin and alpha-actinin by immunofluorescence in the microtubule-microfilament complex of the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. Experimental Cell Research 125(2): 265-274

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Peck R.K.; Duborgel F., 1985: Effects of cations on phagocytosis in the ciliate pseudomicrothorax dubius. Various cations have been examined for their effects on phagocytosis. Media with high [Ca2+] and low [K+]favor phagocytosis, which is inhibited in media with [K+], [Rb+], or [Ba2+] and low [Ca2+]. Microscopical observations of inhibited cells demo...

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Peck, RK. de Haller, G., 1979: Determination of trichocyst position by the epiplasm in the ciliate Pseudomicrothorax dubius. Proceedings of the International Congress of Protozoology, 5: 294

Eperon, S.; Viguès, B.; Peck, R.K., 1993: Immunological characterization of trichocyst proteins in the ciliate Pseudomicrothorax dubius. Ejectable trichocysts were isolated from the ciliate Pseudomicrothorax dubius. Polyclonal antibodies were raised against three groups of trichocyst proteins: G1 (30-31 kDa), G2 (26-27 kDa) and G3 (15-20 kDa). By indirect immunofluorescence, the th...