Title : Changes in myoplasmic pH and calcium concentration during exposure to lactate in isolated rat ventricular myocytes.

Pub. Date : 1993 May

PMID : 8229818






5 Functional Relationships(s)
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1 Exposure to 20 mM lactate at the normal extracellular pH (pHo 7.4) for 10 min caused the pHi to fall rapidly by 0.24 pH units and cell shortening was reduced. Lactic Acid glucose-6-phosphate isomerase Rattus norvegicus
2 During maintained exposure to lactate the pHi remained constant and cell shortening did not recover. Lactic Acid glucose-6-phosphate isomerase Rattus norvegicus
3 Application of Na(+)-H+ exchanger inhibitors, amiloride or ethylisopropyl-amiloride (EIPA), abolished the recovery of pHi and shortening during maintained exposure to lactate at pHo 7.4 and caused an additional acidosis during maintained application of lactate at pHo 6.4. Lactic Acid glucose-6-phosphate isomerase Rattus norvegicus
4 Application of Na(+)-H+ exchanger inhibitors, amiloride or ethylisopropyl-amiloride (EIPA), abolished the recovery of pHi and shortening during maintained exposure to lactate at pHo 7.4 and caused an additional acidosis during maintained application of lactate at pHo 6.4. Lactic Acid glucose-6-phosphate isomerase Rattus norvegicus
5 In conclusion, the Na(+)-H+ exchanger is an important regulator of pHi during a lactate-induced intracellular acidosis. Lactic Acid glucose-6-phosphate isomerase Rattus norvegicus