Abstract
Taurine is taken up by isolated cat retinas incubated in an oxygenated medium in the light or in the dark. Onset and cessation of illumination are associated with a prompt transient release followed by reuptake of taurine; in contrast, glycine is gradually released only with onset of illumination. The uptake of taurine and the light evoked release of taurine followed by reuptake are inhibited by reduction in temperature, iodoacetate, ouabain, and absence of glucose. Similar light-evoked taurine fluxes are observed in the isolated retinas from normal rats and 30-day-old RCS rats but cannot be demonstrated in the photoreceptorless retinas from 180-day-old RCS rats. These findings support the idea that the effects of illumination on taurine fluxes depend on the viability of photoreceptor cells.
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