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- W2074646980 abstract "Heterocyclic amines, 3-amino-1,4-dimethyl-5H-pyrido[4,3-b]indole (Trp-P-1) and 3-amino-1-methyl-5H-pyrido[4,3-b]indole (Trp-P-2), are known to be produced in food by cooking and are carcinogenic. These amines were found to be accumulated in clonal rat pheochromocytoma PC12h cells and to reduce enzyme activity related to catecholamine synthesis. The mechanism of uptake of these heterocyclic amines into PC12h cells was studied. The uptake was dependent on the incubation time, the amount of the cells, and the concentrations of Trp-P-1 and Trp-P-2 in the incubation mixture. The uptake of these amines was saturable with their concentrations, and the uptake velocity followed the Michaelis-Menten equation, indicating that the uptake was mediated by a transporting protein. The uptake was inhibited by dopamine and serotonin, but not by noradrenaline. Involvement of the dopamine uptake system in uptake of the heterocyclic amines was further indicated by the fact that nomifensine and mazindol, specific inhibitors of dopamine uptake, reduced the uptake, but sulpiride, an antagonist of D2 receptor, did not. The significance of the uptake of the carcinogenic heterocyclic amines was discussed in relation to their possible neurotoxicity in the human brain." @default.
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- W2074646980 date "1989-05-01" @default.
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- W2074646980 title "Uptake of heterocyclic amines, Trp-P-1 and Trp-P-2, into clonal rat pheochromocytoma PC12h cells by dopamine uptake system" @default.
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- W2074646980 doi "https://doi.org/10.1016/0304-3940(89)90466-7" @default.
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