MECHANISM OF THE SLOW DEPRESSIVE POTENTIAL PRODUCTION IN THE ISOLATED FROG RETINA
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概要
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1. The mechanism of the slow depressive potential (SDP) production has been investigated with the isolated frog retina deprived of the pigment epithelium.<BR>2. Both the latency and the amplitude of the b-wave were affected by the evolution of the SDP. A decrease in amplitude and an increase in latency were observed during the development of the SDP.<BR>3. Reduction of sodium or magnesium in the bathing solution did not affect significantly both the amplitude of the SDP and the b-wave latency.<BR>4. Exposing the retina to the calcium-free solution, the amplitude of the SDP was decreased and the b-wave latency was lengthened gradually.<BR>5. Lowering the potassium concentration on the receptor side caused an increase, on the contrary, raising the potassium concentration a decrease in amplitude of the SDP. There was a logarithmic relation between the amplitude of the SDP and potassium concentration in the bathing solution. Whereas, raising the potassium concentration on the receptor side led to an increase in the b-wave latency.<BR>6. The ratio of E<SUB>1</SUB> and E<SUB>2</SUB> of the SDP remained constant even if various cation concentrations in the bathing solutions were modified.<BR>7. The SDP induced by a light stimulus was interpreted as the summed response of the negative response and the positive response.<BR>8. Observations from the present study suggested that the SDP is generated most probably by the Muller cell as a depolarization of a cell membrane except that forming the so-called inner limiting membrane.
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