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  • Title: Effects of low [Ca2+]0 upon [K+]0 during and after maintained illumination of the isolated retina of the toad.
    Author: Oakley B.
    Journal: Vision Res; 1984; 24(8):815-9. PubMed ID: 6433553.
    Abstract:
    Using K+-selective microelectrodes, [K+]0 was measured in the receptor layer of the isolated retina of the toad, Bufo marinus, during and after maintained adapting illumination. Lowering [Ca2+]0 to one-tenth of its control value produced larger, more rapid changes in [K+]0 at light onset and offset than under control conditions. Lowering [Ca+]0 also produced rod membrane depolarization in the dark and larger light-evoked changes in rod membrane voltage. The observed effects are consistent with a mechanism by which lowering [Ca+]0 increases sodium conductance in rods in the dark, which in turn increases [Na+]i and stimulates the rods' NA+/K+ pump. This putative mechanism may be used to explain several effects of low [Ca+]0 upon rod function observed previously.
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