OBJECTIVE: To analyze the effect of homeopathic Arnica on mitochondrial oxidative stress induced by Ca(2+) plus inorganic phosphate and/or Fe(2+)-citrate-mediated lipid peroxidation through changes in oxygen consumption rates.
Mitochondria were isolated by differential centrifugation from the livers of adult male Wistar rats which had been treated with Arnica montana 6cH, 12cH, 30cH or succussed 30% ethanol (control) for 21 days.
In the presence of antimycin-A, electron transport chain inhibitor, as evidenced by antimycin-A insensitive O(2) consumption, Arnica inhibited lipid peroxidation of mitochondrial membranes. In oxidative stress conditions, in the presence of Ca(2+) and inorganic phosphate, animals receiving Arnica 30cH had a significant decrease in mitochondrial O(2) consumption compared to control animals.
When administrated orally, Arnica 30cH protects against hepatic mitochondrial membrane permeabilization induced by Ca(2+) and/or Fe(2+)-citrate-mediated lipid peroxidation and fragmentation of proteins due to the attack by reactive oxygen species.