Translator Disclaimer
1 March 2003 A Videomicroscopic Study of the Effect of l-cis-Diltiazem on the Photobehavior of Stentor coeruleus
Author Affiliations +
Abstract

The protozoan ciliate Stentor coeruleus displays a step-up photophobic response to an increase in light intensity in its environment. The motile response consists of a delayed stop of ciliary beating and transient ciliary reversal period. Such light-avoiding behavior was significantly influenced by an incubation of cells with l-cis-diltiazem, a common blocker of cyclic guanosine monophosphate (cGMP)–gated ion channel conductance. The introduction of l-cis-diltiazem to the medium induced ciliary reversal in control cells, mimicking the step-up photophobic response. In light-stimulated ciliates, the presence of this inhibitor caused a substantial decrease of the latency of ciliary stop response, prolongation of the ciliary reversal duration and also an increase of cell photoresponsiveness in a dose- and time-dependent manner. The obtained behavioral results support the suggestion that the photosensitive ciliate S. coeruleus possesses cGMP-gated channels, which may be involved in the process of light signal transduction for the motile photophobic response.

Miroslawa Walerczyk, Hanna Fabczak, and Stanislaw Fabczak "A Videomicroscopic Study of the Effect of l-cis-Diltiazem on the Photobehavior of Stentor coeruleus," Photochemistry and Photobiology 77(3), 339-342, (1 March 2003). https://doi.org/10.1562/0031-8655(2003)077<0339:AVSOTE>2.0.CO;2
Received: 30 August 2002; Accepted: 1 December 2002; Published: 1 March 2003
JOURNAL ARTICLE
4 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top