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- W2017130510 abstract "Paraquat inhibited the acetylcholinesterase activity of human erythrocytes and electric organs of Electrophorus electricus. The inhibition of acetylcholinesterase activity was reversible, as shown from the following two experimental results: [I] The degree of inhibition was not affected by changing the preincubation time of the enzyme and paraquat before the addition of the substrate. [II] The enzyme, preincubated with paraquat and subsequently freed from inhibitor by gel filtration on Sephadex G-25, showed the same activity as the untreated enzyme. Paraquat gave effective protection against the inhibition by an irreversible anionic site inhibitor, dibenamine, but not by irreversible esteratic site inhibitors, dichlorvos and methanesulfonyl chloride. These results indicate that paraquat functions as a reversible inhibitor for the anionic site. The inhibitory powers and Hill coefficients of paraquat and diquat were compared with the other quaternary ammonium compounds. Although secondary to edrophonium, paraquat strongly inhibited acetylcholinesterases of human erythrocytes and electric eel, and showed higher inhibition selectivity for both acetylcholinesterases than for human plasma butyrylcholinesterase. The Hill coefficients concerning the interaction of paraquat with acetylcholinesterases of human erythrocytes and electric eel were given as 0.83 and 0.73, respectively. This indicates negative cooperativity between these enzymes and paraquat, which is similar to the case with d-tubocurarine. On the other hand, diquat showed weak inhibitory power and low inhibition selectivity, and its Hill coefficients were almost 1.0, indicating a competitive inhibition mode." @default.
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- W2017130510 date "1987-01-01" @default.
- W2017130510 modified "2023-10-16" @default.
- W2017130510 title "Inhibitory effects of paraquat and its related compounds on the acetylcholinesterase activities of human erythrocytes and electric eel (Electrophorus electricus)." @default.
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- W2017130510 doi "https://doi.org/10.1271/bbb1961.51.2131" @default.
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