Title : Effect of calcium and other divalent cations on intracellular pH regulation of frog skeletal muscle.

Pub. Date : 1986 Dec

PMID : 3114472






5 Functional Relationships(s)
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1 In fibres depolarized by 50 mM-K, constant [K] X [Cl] in the presence of 1 mM-tetracaine (which blocks Ca release), the rate of pHi recovery from 5% CO2-induced acidification was 0.15 +/- 0.02 delta pHi h-1 (n = 7), whereas in depolarized fibres that had never been exposed to the drug, the rate of recovery was 0.27 +/- 0.01 delta pHi h-1 (n = 5). Tetracaine glucose-6-phosphate isomerase Homo sapiens
2 In fibres depolarized by 50 mM-K, constant [K] X [Cl] in the presence of 1 mM-tetracaine (which blocks Ca release), the rate of pHi recovery from 5% CO2-induced acidification was 0.15 +/- 0.02 delta pHi h-1 (n = 7), whereas in depolarized fibres that had never been exposed to the drug, the rate of recovery was 0.27 +/- 0.01 delta pHi h-1 (n = 5). Tetracaine glucose-6-phosphate isomerase Homo sapiens
3 In fibres depolarized by 50 mM-K, constant [K] X [Cl] in the presence of 1 mM-tetracaine (which blocks Ca release), the rate of pHi recovery from 5% CO2-induced acidification was 0.15 +/- 0.02 delta pHi h-1 (n = 7), whereas in depolarized fibres that had never been exposed to the drug, the rate of recovery was 0.27 +/- 0.01 delta pHi h-1 (n = 5). Tetracaine glucose-6-phosphate isomerase Homo sapiens
4 Yet, when Ca release was not blocked and the depolarized fibres were exposed to tetracaine shortly before CO2 exposure, a similar slow rate of 0.14 +/- 0.03 delta pHi h-1 (n = 7) was observed. Tetracaine glucose-6-phosphate isomerase Homo sapiens
5 Tetracaine reversibly inhibits pHi recovery, but this inhibition is not due to its blocking of Ca release. Tetracaine glucose-6-phosphate isomerase Homo sapiens