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• W1993339441 abstract "1. The contribution of uptake into vascular endothelial cells, of neuronal uptake and of extraneuronal uptake in the dissipation of 5-hydroxytryptamine (5-HT) perfused through the coronary circulation of the rat heart was examined. 2. Hearts from reserpine-pretreated rats were isolated and perfused in vitro with 5-HT, in the absence or presence of inhibitors, and rates of appearance of the deaminated metabolite, 5-hydroxyindoleacetic acid (5-HIAA), in the venous effluent were measured using an h.p.l.c. assay. 3. The steady-state rates of 5-HIAA appearance in the venous effluent in hearts perfused with 1 microM 5-HT (422 +/- 8.48 pmol g-1 min-1, n = 12) were reduced by pretreatment of the rats with 6-hydroxydopamine (22% inhibition), and by inclusion in the perfusion solution of 30 microM cocaine (28% inhibition), 100 microM 3-O-methylisoprenaline (64% inhibition), 100 microM corticosterone (58% inhibition), or 30 microM cocaine and 100 microM 3-O-methylisoprenaline (87% inhibition). 4. The extraneuronal deamination of 5-HT in the heart was saturable (Km = 101 microM, Vmax = 31.2 nmol g-1 min-1). The neuronal deamination of 5-HT was saturated by about 50 fold lower concentrations of 5-HT than was extraneuronal deamination, but Km and Vmax values could not be determined. 5. In the coronary circulation of the rat heart, 5-HT was dissipated by the uptake processes for catecholamines, extraneuronal uptake (predominantly) and neuronal uptake, and subsequent metabolism by monoamine oxidase. There was no evidence that a cocaine-sensitive uptake of 5-HT into vascular endothelial cells made any significant contribution to 5-HT dissipation in the heart." @default.
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• W1993339441 date "1989-06-01" @default.
• W1993339441 modified "2023-10-18" @default.
• W1993339441 title "Dissipation mechanisms for 5-hydroxytryptamine in the coronary circulation of the isolated perfused heart of the rat" @default.
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• W1993339441 doi "https://doi.org/10.1111/j.1476-5381.1989.tb11958.x" @default.
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