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Cannabinoid agonist WIN 55212-2 speeds up the cone response to light offset in goldfish retina

Published online by Cambridge University Press:  24 April 2006

MIEKE L. STRUIK ,
STEPHEN YAZULLA  and
MAARTEN KAMERMANS
MIEKE L. STRUIK
Affiliation:
The Netherlands Ophthalmic Research Institute, Amsterdam, The Netherlands
STEPHEN YAZULLA
Affiliation:
Department of Neurobiology and Behavior, Stony Brook University, Stony Brook, New York
MAARTEN KAMERMANS
Affiliation:
The Netherlands Ophthalmic Research Institute, Amsterdam, The Netherlands
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Abstract

Goldfish cones contain CB1 receptors at the synaptic terminal, selectively accumulate 3H-anandamide, and contain fatty acid amide hydrolase-immunoreactivity, and voltage-gated calcium and potassium currents are modulated by CB1 ligands (Yazulla et al., 2000; Fan & Yazulla, 2003; Glaser et al., 2005). These data suggest that a retinal mechanism may account for some of the psychophysical effects of cannabis. Here, we studied the effect of a cannabinoid agonist on cone light responses. Whole-cell patch-clamp recordings were made from cones in the isolated goldfish retina. Cones were stimulated with a spot of light of variable wavelength and intensities in combination with voltage-and current-clamp protocols. Pharmacological manipulation was performed using the cannabinoid agonist WIN 55212-2 (10 μM). WIN had no effect on the absolute sensitivity of the cones or on the kinetics of the onset response. However, the light-offset response became faster, and the depolarizing overshoot was enhanced. Time constant of the offset response was reduced from 292 ± 28 ms to 180 ± 11 ms (n = 6) (P < 0.01) in the presence of WIN. Acceleration of the offset response was not affected by flash length from 200 ms to 10 s. This was found under current-clamp as well as under voltage-clamp conditions, indicating that the effect of WIN was mediated directly or indirectly by modulation of the cGMP-gated channels in the outer segment of the cones. The effects of WIN were not blocked by the CB1 antagonist SR141716A. With a train of “dark” flashes from a steady background, the photocurrent recovered toward baseline more quickly with WIN than in Control. In summary, cannabinoids speed up the dynamics of the phototransduction deactivation cascade in the cone outer segments. The functional consequence of this effect is to shorten the recovery time to the offset of bright flashes, perhaps resulting in an increase in contrast sensitivity.

Keywords

RetinaConePhotoreceptorCannabinoidGoldfish
Type
Research Article
Information
Visual Neuroscience , Volume 23 , Issue 2 , March 2006 , pp. 285 - 293
Copyright
2006 Cambridge University Press

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