In vivo activation of cirral movement in Stylonychia by calcium

Motor responses of cirri (= organelles consisting of bundles of cilia) in the protozoan Stylonychia are elicited by positive or negative shifts of the membrane voltage from its resting state. The same responses are evoked at voltages near the Ca super(2+) equilibrium potential (E sub(Ca)) applying e...

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Bibliographic Details
Published in:Journal of Comparative Physiology A 1991-06, Vol.168 (6), p.687-695
Main Authors: MOGAMI, Y, MACHEMER, H
Format: Article
Language:English
Subjects:
Biochemistry. Physiology. Immunology. Molecular biology
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Invertebrates
Protozoa
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Summary:Motor responses of cirri (= organelles consisting of bundles of cilia) in the protozoan Stylonychia are elicited by positive or negative shifts of the membrane voltage from its resting state. The same responses are evoked at voltages near the Ca super(2+) equilibrium potential (E sub(Ca)) applying extremely positive steps under voltage clamp. Motor responses recorded at large positive voltages approaching E sub(Ca) from the negative side corresponded to cirral activation following physiological depolarization from the resting potential (DCA). The hyperpolarization-induced activation of the cirri (HCA) was documented during step potentials positive to E sub(Ca), suggesting that the observed HCA of the cirri resulted from an efflux of Ca super(2+) from the ciliary space as compared with DCA, which is related to Ca super(2+) influx.
ISSN:0340-7594
1432-1351
DOI:10.1007/BF00224358