Title : Role of physiological HCO3-buffer on intracellular pH and histamine release in rat peritoneal mast cells.

Pub. Date : 1998 Aug

PMID : 9644216






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1 The purpose of this study was to examine how intracellular pH (pHi) regulation and histamine release are affected by HCO3- in rat peritoneal mast cells. Bicarbonates glucose-6-phosphate isomerase Rattus norvegicus
2 This fall in pHi is inhibited by the carbonic anhydrase inhibitor dichlorphenamide and is Na+-independent, indicating the involvement of Na+-independent Cl-/HCO3- exchange activity. Bicarbonates glucose-6-phosphate isomerase Rattus norvegicus
3 Histamine release stimulated by antigen and compound 48/80 was substantially reduced in the presence of HEPES/ HCO3- buffer (pHo 7.4, pHi 6.66). Bicarbonates glucose-6-phosphate isomerase Rattus norvegicus
4 Histamine release was increased, however, when pHi was clamped to 6.66 in HCO3--free media (pHo 6.9). Bicarbonates glucose-6-phosphate isomerase Rattus norvegicus
5 We conclude that: (1) Na+-independent Cl-/HCO3- exchange determines steady-state pHi in rat peritoneal mast cells; and (2) the reduction in histamine release observed in the presence of HCO3- is not due to its effect on pHi per se, but rather on other changes in ion transport. Bicarbonates glucose-6-phosphate isomerase Rattus norvegicus
6 We conclude that: (1) Na+-independent Cl-/HCO3- exchange determines steady-state pHi in rat peritoneal mast cells; and (2) the reduction in histamine release observed in the presence of HCO3- is not due to its effect on pHi per se, but rather on other changes in ion transport. Bicarbonates glucose-6-phosphate isomerase Rattus norvegicus
7 We conclude that: (1) Na+-independent Cl-/HCO3- exchange determines steady-state pHi in rat peritoneal mast cells; and (2) the reduction in histamine release observed in the presence of HCO3- is not due to its effect on pHi per se, but rather on other changes in ion transport. Bicarbonates glucose-6-phosphate isomerase Rattus norvegicus