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  • Title: [Photo-induced release of calcium ions frog retina photoreceptor membranes in media of different ionic composition].
    Author: Bykov KA, Tomilin NV.
    Journal: Fiziol Zh SSSR Im I M Sechenova; 1981 May; 67(5):652-6. PubMed ID: 6974654.
    Abstract:
    Two methods: labelled Ca45 and Ca++-selective electrode served to assess the Ca++ release during illumination of the rod outer segments in the frog retina. The maximal release (8--10 M Ca++/M bleached rhodopsin) occurred in monovalent cations--free medium (100 MM tris--HCl, 5 mM MgCl2, 5 mM ATP, pH--7.5), when at least 50% of visual pigment was bleached. The addition of Na+ or K+ toincubation medium decreased the photoinduced release to 0.06--0.142 M Ca++/M bleached rhodopsin or completely suppressed it. The role of Ca++ as a messenger during the excitation of photoreceptor is discussed.
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