Abstract
Complex I is the main O2 − producer of the mitochondrial respiratory chain. O2 − release is low with NAD-linked substrates and increases strongly during succinate oxidation, which increases the QH2/Q ratio and is rotenone sensitive. We show that the succinate dependent O2 − production (measured as H2O2 release) is inhibited by propargylamine containing compounds (clorgyline, CGP 3466B, rasagiline and TVP-1012). The inhibition does not affect membrane potential and is unaffected by ΔpH modifications. Mitochondrial respiration is similarly unaffected. The propargylamines inhibition of O2 −/H2O2 production is monitored also in the presence of the Parkinson's disease toxin dopaminochrome which stimulates O2 − release. Propargylamine-containing compounds are the first pharmacological inhibitors described for O2 − release at Complex I.
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Zoccarato, F., Cappellotto, M. & Alexandre, A. Clorgyline and other propargylamine derivatives as inhibitors of succinate-dependent H2O2 release at NADH:UBIQUINONE oxidoreductase (Complex I) in brain mitochondria. J Bioenerg Biomembr 40, 289–296 (2008). https://doi.org/10.1007/s10863-008-9160-z
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DOI: https://doi.org/10.1007/s10863-008-9160-z