Effect of ionomycin on cell pH in isolated renal proximal tubules.

Abstract:

:In isolated rabbit proximal tubules the addition of 2.0 microM but not 0.2 microM ionomycin induced a sustained increase in cell pH ([pH]i). This [pH]i response to 2.0 microM ionomycin was shown to be independent of several transporters such as Na+/H+ exchanger, Na(+)-HCO3- cotransporter, Cl-/HCO3- exchanger, or H(+)-ATPase. On the other hand, the removal of extracellular Ca2+ abolished the [pH]i increase or even induced a transient [pH]i decrease in the presence of ionomycin. These results are consistent with the induction of Ca2+/H+ exchange by ionomycin. Therefore Ca2+ ionophores should be used with caution as probes to estimate renal tubule functions.

authors

Yamada H,Seki G,Taniguchi S,Uwatoko S,Suzuki K,Kurokawa K

doi

10.1006/bbrc.1996.1156

subject

Has Abstract

pub_date

1996-08-05 00:00:00

pages

215-8

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(96)91156-0

journal_volume

225

pub_type

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