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. 1972 Aug;129(1):39–54. doi: 10.1042/bj1290039

Biochemical effects of the hypoglycaemic compound diphenyleneiodonium. Catalysis of anion–hydroxyl ion exchange across the inner membrane of rat liver mitochondria and effects on oxygen uptake

P C Holland 1,*, H S A Sherratt 1
PMCID: PMC1174040  PMID: 4265024

Abstract

1. The hypoglycaemic compound diphenyleneiodonium causes rapid and extensive swelling of rat liver mitochondria suspended in 150mm-NH4Cl, and in 150mm-KCl in the presence of 2,4-dinitrophenol and valinomycin. This indicates that diphenyleneiodonium catalyses a compulsory exchange of OH− for Cl− across the mitochondrial inner membrane. Br− and SCN− were the only other anions found whose exchange for OH− is catalysed by diphenyleneiodonium. 2. Diphenyleneiodonium inhibited state 3 respiration of mitochondria and slightly stimulated state 4 respiration with succinate or glutamate as substrate in a standard Cl−-containing medium. 3. Diphenyleneiodonium did not inhibit state 3 respiration significantly in two Cl−-free media (based on glycerol 2-phosphate or sucrose) but caused some stimulation of state 4. 4. In Cl−-containing medium diphenyleneiodonium only slightly inhibited the 2,4-dinitrophenol-stimulated adenosine triphosphatase and it had little effect in the absence of Cl−. 5. The inhibition of respiration in the presence of Cl− is dependent on the Cl−–OH− exchange. 2,4-Dichlorodiphenyleneiodonium is ten times as active as diphenyleneiodonium both in causing swelling of mitochondria suspended in 150mm-NH4Cl and in inhibiting state 3 respiration in Cl−-containing medium. Indirect evidence suggests that the Cl−–OH− exchange impairs the rate of uptake of substrate anions. 6. It is proposed that stimulation of state 4 respiration in the absence of Cl− depends, at least in part, on an electrogenic uptake of diphenyleneiodonium cations. 7. Tripropyl-lead acetate, methylmercuric iodide and nine substituted diphenyleneiodonium derivatives also catalyse Cl−–OH− exchange across the mitochondrial membrane. 8. Diphenyleneiodonium is compared with the trialkyltin compounds, which are also known to mediate Cl−–OH− exchange and which have in addition strong oligomycin-like effects on respiration. It is concluded that diphenyleneiodonium is specific for catalysing anion–OH− exchange and will be a useful reagent for investigating membrane-dependent systems.

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Selected References

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