[Effect of H+ extracellular and intracellular buffering capacity on the activity Ca2+/H+ exchange in the lymphocyte plasma membrane].
Formation of delta pH is registered when studying Ca2+ passive transport through lymphocytes' plasma membrane (PM). The pHi values strongly depended on pH0. Changes of pH0 lead to unidirectional changes of pHi and affect Ca2+ concentration in cytoplasm of the intact cells. The presence of Ca(2+)-channels antagonists does not affect this phenomenon. Ca2+/H+ exchange is supposed to exist in PM. It is also of great interest that cytoplasmic Ca2+ and H+ activities are some equal in physiological range. Besides, H(+)-buffering as well as Ca(2+)-buffering systems are present in the cell and have their maximal capacity about 7.2 in the intact cells. The spectrofluorimetric study of internal lymphocytes' H(+)-buffering capacity with titration technique using weak base, acid or other buffer addition has demonstrated maximal value of 9.0-1.1 mM depending on the substance to be added.
Bevza
O V
OV
O.V. Palladin Institute of Biochemistry, National Academy of Ukraine, Kyiv.
Kucherenko
S M
SM
D002021:Buffers; D000252:Calcium-Transporting ATPases; D002462:Cell Membrane / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008214:Lymphocytes / Q000378:metabolism* / Q000648:ultrastructure; D011522:Protons; D013050:Spectrometry, Fluorescence; D017186:Titrimetry
D002021:Buffers; D011522:Protons; D000252:Calcium-Transporting ATPases
Vplyv pozaklitynnoï i vnutrishn'oklitynnoï bufernoï iemnosti dlia H+ na Ca2+/H+ obmin u plazmatychniĭ membrani limfotsytiv.