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- W2049271726 abstract "To elucidate the role of bicarbonate-dependent mechanisms and Na+/H+ exchange in maintenance of physiological intracellular pH (pHi) under various steady-state conditions, phosphorus NMR spectra were taken in isovolumically-contracting, perfused ferret hearts. Switching the perfusate from HCO3-/CO2 to HEPES buffer significantly decreased pHi from the control value of 7.14 +/- 0.01 (mean +/- S.E., n = 4) to 7.08 +/- 0.01 (P < 0.01). Exposure to 4-acetamide-4'-isothiocyanatostilbene-2,2'-disulphonic acid (SITS; 10(-4) M) a blocker of anion exchange (7.12 +/- 0.01 in control, 7.07 +/- 0.02 with SITS, n = 6, P < 0.05), led to acidification of pHi. Ethylisopropylamiloride (EIPA; 10(-6) M), a blocker of the Na+/H+ exchange, induced a decrease in pHi (7.17 +/- 0.01 in control, 7.11 +/- 0.01 with EIPA, n = 5, P < 0.05). Lowering [Cl-] in the perfusate (7.14 +/- 0.02 in control, 7.09 +/- 0.03 with low-[Cl]o perfusate, n = 5, P < 0.01) also decreased pHi, perhaps by a non-bicarbonate-dependent mechanism. These results indicate that both bicarbonate-dependent mechanisms and Na+/H+ exchange contribute significantly and additively to the maintenance of physiological pHi in isovolumically contracting, perfused hearts." @default.
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- W2049271726 date "1994-07-01" @default.
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- W2049271726 title "Control of Steady-state Intracellular pH in Intact Perfused Ferret Hearts" @default.
- W2049271726 doi "https://doi.org/10.1006/jmcc.1994.1099" @default.
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