Abstract

The in vitro effect of aflatoxin B 1 (AFB 1) on the coupling membrane-bound and matrix NAD +-dependent dehydrogenases and electron transport complexes of guinea fowl ( Numida meleagris Pearl) liver mitochondria was investigated. Redox-dye measure ments indicated that AFB 1 (0.05 – 5 μ m) decreased the activities of the membrane-bound dehydrogenases, whereas the matrix enzymes were only inhibited at the highest toxin concentration tested. Spectrophotometric studies of the electron transfer complexes spanning the entire respiratory chain suggest that AFB 1 interferes with mitochondrial electron transport by inhibiting succinate dehydrogenase activity and the cytochrome systems.

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