Protective effect of P2Y receptors antagonism on stress-induced retinal degeneration
Bao, Y.; Bond, K.; Sarraf, P.; Esterberg, R.; Serpa, M.; Twarog, M.; Xu, Y.; MacLeod, H.; Huang, Q.; Saint-Geniez, M.
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The death of retinal pigment epithelial (RPE) cells and photoreceptors (PR) is a hallmark of the progression of several degenerative ocular disorders. The precise molecular driver(s) behind RPE and PR cell death, however, remains unknown. Recent studies have suggested the involvement of ATP and purinergic signaling in the progression of age-related macular degeneration (AMD) and retinal degeneration. We have discovered that RPE cells release ATP when subjected to stress, which in turn exacerbates stress-related signaling via purinergic receptors that ultimately results in degeneration. Our findings demonstrate that blocking P2Y purinergic receptors using suramin can effectively prevent toxin-induced RPE cell death and dysfunction in vitro. Furthermore, we show efficacy of suramin in preventing photoreceptor degeneration in vivo using the RHO-P23H zebrafish model. This study reinforces the involvement of ATP and purinergic signaling in maintaining retinal health, and highlights the potential of purinergic receptor antagonism as a therapeutic strategy for retinal degeneration.
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