Crosstalk between cytosolic pH and intracellular calcium in human lymphocytes -: Effect of 4-aminopyridin, ammonium chloride and ionomycin

被引:19
作者
Cabado, AG
Alfonso, A
Vieytes, MR
González, M
Botana, MA
Botana, LM [1 ]
机构
[1] Univ Santiago de Compostela, Hosp Xeral,Fac Vet, Dept Fisiol, Serv Hematol,Secc Endocrinol, E-27002 Lugo, Spain
[2] Univ Santiago de Compostela, Hosp Xeral,Fac Vet, Dept Farmacol, Serv Hematol,Secc Endocrinol, E-27002 Lugo, Spain
关键词
lymphocytes; pHi; Na+/H+ exchanger; Ca2+; 4-AP; NH4Cl; thapsigargin; caffeine; ionomycin;
D O I
10.1016/S0898-6568(00)00101-7
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Stimulation of lymphocytes by specific antigens is followed by the activation of different signal transduction mechanisms, such as alterations in the cytoplasmic levels of Ca2+, H+ and variations in membrane potential. To study interrelationships among these parameters, changes in pHi and Ca2+ were measured with the fluorescent probes BCECF and Fura-2 in freshly isolated blood human lymphocytes. Moreover, membrane potential qualitative alterations were recorded with the fluorescent dye bisoxonol. In a bicarbonate-free medium, cell alkalinization with NH4Cl slightly decreased intracellular Ca2+ concentration ([Ca2+](i)) due to efflux of Ca2+ from the cell. In contrast, an elevation of pHi induced with 4-AP increased [Ca2+](i), either in the presence or absence of external Ca2+. The increase in Ca2+-free medium is likely to be due to Ca2+ release from thapsigargin and caffeine-independent intracellular stores. Both 4-AP or NH4Cl induced a plasma membrane depolarisation, although with different kinetics. The ionosphere ionomycin increased pHi, Ca2+ levels and also induced membrane depolarisation. Together, these observations demonstrate a lack of correlation between the magnitude of changes in pHi and Ca2+. (C) 2000 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:573 / 581
页数:9
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