Abstract
Isolated cat retinas have a high-affinity mechanism for uptake of [3H]taurine associated with the photoreceptor cells and a non-saturable mechanism for uptake of [3H]taurine associated with the inner retina. Retinas from slightly taurine-deficient cats show increased affinity for [3H]taurine and increased maximum velocity of uptake while the nonsaturable mechanism for taurine uptake is not affected by taurine deficiency. The Vmax of the high-affinity uptake mechanism is enhanced when Na+ concentrations are increased or when K+ concentrations are reduced in the incubation medium. In contrast with the above findings neither Na+ nor K+ affects uptake of taurine by the nonsaturable mechanism.
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