Add time:08/02/2019         Source:sciencedirect.com

1-Methyl-4-phenylpyridinium ion, a major brain metabolite of the neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine, is an inhibitor of Complex I of the mitochondrial respiratory chain. We have synthesized several analogs of 1-methyl-4-phenylpyridinium ion containing various alkyl groups in the 4′ position of the phenyl ring and have tested them for their abilities to inhibit the oxidation of NADH-linked substrates by intact mouse liver mitochondria. These compounds are considerably more potent inhibitors than MPP+ itself, with potency increasing as the length of the alkyl chain increases. The most potent inhibitor, 1-methyl-4-(4′heptylphenyl)pyridinium ion, was about 200 times as effective as MPP+. These analogs should prove to be useful tools for studying the nature of the process whereby MPP+ and its pyridinium analogs interact with Complex I to inhibit mitochondrial respiration.

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