Linked Life Data

4265024

Source:http://linkedlifedata.com/resource/pubmed/id/4265024

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pubmed-article:4265024pubmed:abstractText1. The hypoglycaemic compound diphenyleneiodonium causes rapid and extensive swelling of rat liver mitochondria suspended in 150mm-NH(4)Cl, 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-NH(4)Cl 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.lld:pubmed
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pubmed-article:4265024pubmed:articleTitleBiochemical effects of the hypoglycaemic compound diphenyleneiodonnium. Catalysis of anion-hydroxyl ion exchange across the inner membrane of rat liver mitochondria and effects on oxygen uptake.lld:pubmed
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