Retinal taurine depletion and phototarget vulnerability

Background: Taurine depletion has been proposed as a contributor to retinal vulnerability because phototargets are highly dependent on amino acid homeostasis. We examined the relationship between reduced taurine availability, retinal structure, and phototarget survival in preclinical models. Animals subjected to taurine restriction or altered transport displayed progressive retinal thinning, increased phototarget stress markers, and impaired visual function compared with controls. Histologic analyses showed greater outer segment disruption and cell loss in taurine-depleted groups, while supplementation or restoration of taurine availability mitigated damage in several experiments. The findings are consistent with taurine serving a trophic and membrane-stabilizing role in the retina rather than acting solely as a general antioxidant. Although experimental conditions varied, the direction of effect was strikingly uniform. These data support taurine as a key maintenance factor for retinal integrity and provide a biologic rationale for studying taurine status in human retinal disease and developmental vulnerability.