title: Influence of Tl(+) on mitochondrial permeability transition pore in Ca(2+)-loaded rat liver mitochondria.
abstract: The Tl(+)-induced opening of the MPTP in Ca(2+)-loaded rat liver mitochondria energized by respiration on the substrates succinate or glutamate plus malate was recorded as increased swelling and dissipation of mitochondrial membrane potential as well as decreased state 4, or state 3, or 2,4-dinitrophenol-stimulated respiration. These effects of Tl(+) increased in nitrate media containing monovalent cations in the order of Li(+) < NH (4) (+) ≤ Na(+) < K(+). They were potentiated by inorganic phosphate and diminished by the MPTP inhibitors (ADP, CsA, Mg(2+), Li(+), rotenone, EGTA, and ruthenium red) both individually and more potently in their combinations. Maximal swelling of both non-energized and energized Ca(2+)-loaded mitochondria in rotenone-free media is an indication of Ca(2+) uptake driven by respiration on mitochondrial endogenous substrates. It is suggested that Tl(+) (distinct from Cd(2+), Hg(2+), and other heavy metals and regardless of the used respiratory substrates) can stimulate opening of the MPTP only in the presence of Ca(2+). We discuss the possible participation of Ca(2+)-binding sites, located near the respiratory complex I and the adenine nucleotide translocase, in inducing opening of the MPTP.
authors.affiliation: Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg. korotkov@SK1645.spb.edu
authors.forename: Sergey M
authors.initials: SM
authors.lastname: Korotkov
authors.forename: Nils-Erik L
authors.initials: NE
authors.lastname: Saris
mesh_terms: D000818:Animals; D001665:Binding Sites; D002118:Calcium / Q000494:pharmacology*; D002414:Cations, Monovalent / Q000378:metabolism; D018698:Glutamic Acid / Q000378:metabolism; D008293:Malates / Q000378:metabolism; D008297:Male; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D008930:Mitochondria, Liver / Q000378:metabolism*; D033681:Mitochondrial Membrane Transport Proteins / Q000378:metabolism*; D000083162:Mitochondrial Permeability Transition Pore; D010101:Oxygen Consumption / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar; D019802:Succinic Acid / Q000378:metabolism; D013793:Thallium / Q000494:pharmacology*
chemical_list: D002414:Cations, Monovalent; D008293:Malates; D033681:Mitochondrial Membrane Transport Proteins; D000083162:Mitochondrial Permeability Transition Pore; D018698:Glutamic Acid; C030298:malic acid; D019802:Succinic Acid; D013793:Thallium; D002118:Calcium