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- W2201309468 abstract "<b><i>Purpose:</i></b> Adenosine triphosphate (ATP) is involved in the tone regulation of retinal arterioles, and the effect may be direct, through ATP degradation or mediated by cyclo-oxygenase products. However, the relative contribution of these mechanisms and the extent to which the mechanisms are active in the retinal vascular wall or depend on the perivascular retinal tissue are unknown. <b><i>Methods:</i></b> Porcine retinal arterioles with perivascular retinal tissue were mounted in a wire myograph for isometric tone recordings. The relaxing effects of ATP and the non-degradable analogue ATP-γS were studied in the presence of antagonists to ATP, adenosine and prostaglandin E (EP) receptors. The experiments were repeated after removal of the perivascular retinal tissue. <b><i>Results:</i></b> ATP induced a significant concentration-dependent relaxation of retinal arterioles (p < 0.05) which was reduced after removal of perivascular retinal tissue. The effect was due to non-degraded ATP and a degradation product of ATP acting via adenosine receptors. Relaxation was reduced by ibuprofen and blocking of EP<sub>1</sub> receptors. <b><i>Conclusion:</i></b> ATP-induced relaxation of retinal arterioles is mediated by ATP, ATP degradation products and by stimulation of EP<sub>1</sub> receptors, involving both the perivascular retina and the vascular wall. The findings emphasize the complexity of purinergic effects in the regulation of retinal vascular tone." @default.
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- W2201309468 date "2015-01-01" @default.
- W2201309468 modified "2023-09-26" @default.
- W2201309468 title "Purinergic Mechanisms and Prostaglandin E Receptors Involved in ATP-Induced Relaxation of Porcine Retinal Arterioles in vitro" @default.
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- W2201309468 doi "https://doi.org/10.1159/000438905" @default.
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