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J Neurophysiol 84: 133-138, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 84 No. 1 July 2000, pp. 133-138
Copyright ©2000 by the American Physiological Society

Depolarization-Induced Calcium Channel Facilitation in Rod Photoreceptors Is Independent of G Proteins and Phosphorylation

Dmitri E. Kourennyi1 and Steven Barnes2

 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106; and  2Department of Physiology and Biophysics and Department of Ophthalmology, Dalhousie University, Halifax, Nova Scotia B3H 4H7 Canada

Kourennyi, Dmitri E. and Steven Barnes. Depolarization-Induced Calcium Channel Facilitation in Rod Photoreceptors Is Independent of G Proteins and Phosphorylation. J. Neurophysiol. 84: 133-138, 2000. Depolarization-induced facilitation of L-type Ca channels in rod photoreceptors was investigated with nystatin-perforated and ruptured whole cell patch-clamp techniques in cells isolated from tiger salamander retina. Induction of facilitation was voltage dependent with a half-maximal effect seen at prepulse potentials near +31 mV. Reversal of facilitation was time dependent with fast (tau  approx 20 ms) and slow (tau  approx 1 s) components at -60 mV. Incubation of cells with pertussis toxin or intracellular administration of guanosine 5'-O-(3-thiotriphosphate) or guanosine 5'-O-(2-thiodiphosphate) had no effect on the degree to which facilitation could be evoked, implying the absence of a significant role for G proteins. Application of the phosphatase inhibitor okadaic acid or inclusion of ATP, to boost levels of phosphorylation, or inclusion of 5'adenylylimidophosphate or inhibitors of protein kinase in the pipette, to reduce levels of phosphorylation, had no effect on the development of facilitation, suggesting that phosphorylation has little or no role in this phenomenon. These results show that the L-type Ca channels in rod photoreceptors, which appear to be composed of alpha 1F-like subunits, undergo voltage-dependent facilitation in a manner that differs from some other L-type Ca channels which undergo facilitation via phosphorylation or through G-protein-mediated inhibition.




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