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• W2164116069 abstract "S-nitrosothiols (RSNOs) regulate several aspects of platelet physiology including inhibition of activation, adhesion and aggregation. PDI (protein disulphide-isomerase) has recently been found to be localized to the cell surface, where it exhibits both disulphide-exchange and denitrosation activities. The disulphide-exchange activity of PDI has been linked to aspects of platelet aggregation. The present study suggests that the metabolism of RSNOs by platelets is a function of PDI denitrosation activity. Exposure of washed human platelets to increasing concentrations of GSNO (S-nitrosoglutathione) resulted in saturable denitrosation kinetics. The presence of known PDI inhibitors phenylarsine oxide and anti-PDI antibodies prevented GSNO denitrosation. The fact that, in the presence of GSNO plus the cell-permeable guanylate cyclase inhibitor 1H-[1,2,4]oxadiazolo-[4,3-a]quinoxaline-1-one, the initial rates of ADP-induced platelet aggregation and the maximum ΔOD were diminished by ∼40% shows that RSNOs have dual inhibitory effects on platelets, which are mediated through PDI. First, PDI denitrosates RSNOs, releasing NO that, via the guanylate cyclase/G-kinase route, attenuates platelet activation. Secondly, RSNOs are denitrosated at the same PDI-active site that catalyses the disulphide bond formation between integrins and their ligands, thereby attenuating irreversible aggregation." @default.
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• W2164116069 date "2004-08-24" @default.
• W2164116069 modified "2023-09-30" @default.
• W2164116069 title "Platelet cell-surface protein disulphide-isomerase mediated <i>S</i>-nitrosoglutathione consumption" @default.
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• W2164116069 doi "https://doi.org/10.1042/bj20040759" @default.
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