title: Lucigenin-derived chemiluminescence in intact isolated mitochondria.
abstract: There are many data both in favor and against the use of lucigenin as a probe for superoxide anion (SA) in mitochondria, cells, and simple enzymatic systems. In the present work high concentrations (50-400 micro M) of lucigenin were used for continuous recording of rapid and reversible changes in the SA level in intact isolated mitochondria. The SA level in the presence of lucigenin rapidly and reversibly changed during the transition of the mitochondria from one functional state to another: under conditions of ATP synthesis from ADP and Pi, of Ca2+ accumulation, and of reverse electron transfer. Induction of a Ca2+,cyclosporin A-sensitive pore in mitochondria completely suppressed the lucigenin-derived chemiluminescence (LDC). The electron transfer in the Q-cycle of the respiratory chain complex III and high electric potential difference across the inner membrane of mitochondria were obligatory conditions for generation of a SA-dependent chemiluminescent signal. Based on our own and literature data, a scheme of LDC generation is suggested. The origin of superoxide anion detected in intact mitochondria with lucigenin is discussed.
authors.affiliation: Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia. kruglovag@mail.ru
authors.forename: A G
authors.initials: AG
authors.lastname: Kruglov
authors.forename: I S
authors.initials: IS
authors.lastname: Yurkov
authors.forename: V V
authors.initials: VV
authors.lastname: Teplova
authors.forename: Yu V
authors.initials: YV
authors.lastname: Evtodienko
mesh_terms: D000166:Acridines / Q000737:chemistry*; D000244:Adenosine Diphosphate / Q000378:metabolism / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000737:chemistry / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D002259:Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone / Q000494:pharmacology; D004579:Electron Transport; D014450:Electron Transport Complex III / Q000037:antagonists & inhibitors / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007425:Intracellular Membranes / Q000187:drug effects / Q000378:metabolism / Q000502:physiology; D008163:Luminescent Measurements; D008274:Magnesium / Q000737:chemistry / Q000378:metabolism; D008564:Membrane Potentials / Q000187:drug effects / Q000502:physiology; D008930:Mitochondria, Liver / Q000378:metabolism*; D019289:Pyruvic Acid / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D019802:Succinic Acid / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism
chemical_list: D000166:Acridines; D004791:Enzyme Inhibitors; D013481:Superoxides; C033472:10,10'-dimethyl-9,9'-biacridinium; D002259:Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone; D000244:Adenosine Diphosphate; D019289:Pyruvic Acid; D000255:Adenosine Triphosphate; D019802:Succinic Acid; D014450:Electron Transport Complex III; D008274:Magnesium; D002118:Calcium