title: A cyanine dye tri-S-C7(5). Phosphate-dependent cationic uncoupler of oxidative phosphorylation in mitochondria.
abstract: The trinuclear cyanine dye, tri-S-C7(5), at about 10 microM stimulated State 4 respiration of rat liver mitochondria more than 6-fold and released oligomycin-inhibited respiration completely. Thus, the dye is concluded to be a very effective cationic uncoupler of oxidative phosphorylation in mitochondria. However, for exhibition of its uncoupling action, the presence of Pi (or arsenate) was necessary, and a phosphate-transport inhibitor, N-ethylmaleimide or mersalyl, inhibited its action. The stimulation of phosphate transport via the Pi carrier by the dye is suggested to be directly related to the uncoupling action.
mesh_terms: D000818:Animals; D005033:Ethylmaleimide / Q000494:pharmacology; D008297:Male; D008634:Mersalyl / Q000494:pharmacology; D008930:Mitochondria, Liver / Q000187:drug effects / Q000378:metabolism*; D010085:Oxidative Phosphorylation / Q000187:drug effects*; D010101:Oxygen Consumption / Q000187:drug effects; D010710:Phosphates / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D013844:Thiazoles / Q000494:pharmacology*; D014475:Uncoupling Agents / Q000494:pharmacology*
chemical_list: D010710:Phosphates; D013844:Thiazoles; D014475:Uncoupling Agents; C032149:platonin; D008634:Mersalyl; D005033:Ethylmaleimide