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. 1982 Sep 15;206(3):611–618. doi: 10.1042/bj2060611

The effect of beta-adrenergic agonists on the membrane potential of fat-cell mitochondria in situ.

R J Davis, B R Martin
PMCID: PMC1158630  PMID: 7150265

Abstract

1. The accumulation of [3H]methyltriphenylphosphonium by isolated fat-cells was used to estimate the membrane potential of mitochondria in situ. 2. Adrenaline caused a large decrease in the accumulation of [3H]methyltriphenylphosphonium. Mitochondria in fat-cells incubated in the presence of adrenaline had a very low calculated membrane potential. This effect was also given by isoprenaline (a beta-adrenergic agonist) and was blocked by propranolol (a beta-adrenergic antagonist). 3. The effect of isoprenaline could be partially antagonized by the use of media with high albumin concentrations. Addition of sodium oleate to saturate the fatty acid-binding sites on the albumin reversed this antagonism. 4. It is proposed that the decrease in the calculated mitochondrial membrane potential is due to the uncoupling effect of the non-esterified fatty acids released by the stimulation of lipolysis observed in the presence of beta-adrenergic agonists.

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Selected References

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