Photoreceptors and Calcium by Kei Nakatani, Chunhe Chen, King-Wai Yau, Yiannis Koutalos

By Kei Nakatani, Chunhe Chen, King-Wai Yau, Yiannis Koutalos (auth.), Wolfgang Baehr Ph.D., Krzysztof Palczewski Ph.D. (eds.)

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Then neglecting this term, it can be shown that for a ratio ∆[Ca]T(tip) / ∆[Ca]T(base) = 3, as in eqs. 01µM near the base. This is more than a twelvefold change along the ROS, which would imply a correspondingly large change in the properties of the buffer. This is an extreme situation, but if one assumes values for Kbuff found experimentally,33 the results are even more questionable. It therefore appears that a change in Kbuff alone cannot account for the calcium gradient. N. LEIBOVIC also the case here as shown in Figure 7.

46. Greenberger LM, Besharse JC. Photoreceptor disc shedding in eye cups. Inhibition by deletion of extracellular divalent cations. Invest Ophthalmol Vis Sci 1983; 24:1456-64. 47. LaVail MM. Rod outer segment disk shedding in rat retina: relationship to cyclic lighting. Science 1976; 194:1071-4. THE TIME COURSE OF LIGHT ADAPTATION IN VERTEBRATE RETINAL RODS Peter D. Calvert and Clint L. Makino ABSTRACT The photoresponse of a rod wanes over time in steady illumination, as light loses its efficacy in generating the response.

Vertebrate Photoreceptors. Prog Retin Eye Res 2001; 20:49-94. 16. Polans A, Baehr W, Palczewski K. Turned on by Ca2+! The physiology and pathology of Ca2+-binding proteins in the retina. Trends Neurosci. 1996; 19:547-554. 17. Dizhoor AM et al. The human photoreceptor membrane guanylyl cyclase, RetGC, is present in outer segments and is regulated by calcium and a soluble activator. Neuron 1994; 12:1345-1352. 18. Gorczyca WA et al. Purification and physiological evaluation of a guanylate cyclase activating protein from retinal rods.

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