Echtay and others have suggested that ROS-induced mild uncoupling via UCPs/ANT effectively acts as a negative-feedback loop by decreasing mitochondrial membrane potential, thereby attenuating further ROS production [ 6, 10].
Heart ischemia/reperfusion detrimental effects can be ameliorated through pre-conditioning with mild uncoupling using chemical uncouplers while studies on mice show that uncoupler treatment can increase life span, reduce oxidative stress and improve insulin levels [ 21].
It is possible secondary deleterious effects resulting from ubiquitous mild uncoupling activity may be overcoming any beneficial tissue-specific effects of decreased ROS production, providing an explanation for the lifespan effects.
Although increased uncoupling might exacerbate tissue hypoxia, due to the increased oxygen required in order to maintain ATP synthesis, the antioxidant effect elicited by mild uncoupling might, under these circumstances, outweigh the harm.
Most of the tested extracts were not very effective in preventing the uncoupling effect of rotenone.
Activation of avUCP would generate a mild uncoupling that may decrease proton motive force, reducing local oxygen tension and attenuating superoxide production [ 3, 8, 10, 19].
Indeed, mild uncoupling in cultured mammalian neurons, caused by chemical uncouplers, does not lower the production of ROS, arguing against the postulate (Johnson-Cadwell et al., 2007; Tretter and Adam-Vizi, 2007).
ROS production is very sensitive to mild uncoupling in isolated Drosophila mitochondria (Miwa et al., 2003) and mild mitochondrial uncoupling may be neuroprotective.
Knowledge-intensive services have an uncoupling effect, but less so at the high-tech end of these services.
Conclusions: Inhibiting complex I with metformin prevents the uncoupling effect of DNP in sham animals.
