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• W2430065665 abstract "The concentration of free Na+ in the matrix of isolated pig heart mitochondria has been monitored using the fluorescent probe sodium-binding benzofuran isophthalate (SBFI) developed by Minta and Tsien (J. Biol. Chem. 264: 19449-19457, 1989). SBFI was sequestered in the matrix by hydrolysis of the permeant acetoxymethyl ester. The sequestered probe showed altered quantum efficiency and excitation spectra in the presence and absence of Na+ when compared with SBFI free acid in solution. Fluorescence was calibrated in situ by using ionophores to equilibrate matrix [Na+] with external [Na+]. SBFI fluorescence showed that matrix [Na+] increased linearly as external [Na+] was increased to 95 mM in the presence or absence of respiration. Respiring mitochondria maintained a Na+ gradient (Na+ out greater than Na+in) of approximately 8.0. The corresponding gradient in nonrespiring mitochondria was approximately 2.0. The Na+ gradient was nearly equivalent to the H+ gradient in the presence or absence of respiration. The uptake of Pi by respiring mitochondria decreased matrix pH and increased matrix [Na+]. It is concluded that isolated mitochondria maintain a Na+ gradient across the inner membrane as a result of the activity of the endogenous Na(+)-H+ antiport." @default.
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• W2430065665 date "1992-04-01" @default.
• W2430065665 modified "2023-10-15" @default.
• W2430065665 title "Transmembrane gradients of free Na+ in isolated heart mitochondria estimated using a fluorescent probe" @default.
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• W2430065665 doi "https://doi.org/10.1152/ajpcell.1992.262.4.c1047" @default.
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