Intracellular pH changes of cultured bovine aortic endothelial cells in response to ATP addition

Takanari Kitazono, Koichiro Takeshige, Edward J. Cragoe, Shigeki Minakami

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The changes of the intracellular pH (pHi) of cultured bovine aortic endothelial cells were fluorometrically monitored using 2′,7′-bis(carboxyethyl)carboxyfluorescein (BCECF). A biphasic pHi change was observed by addition of ATP: an initial acidification followed by an alkalinization of about 0.2 pH unit above the resting level of pHi 7.23. The alkalinization was dependent on [Na+]o and [H+]o, and was inhibited by 5-(N,N-hexamethylene)amiloride, indicating that the alkalinization is mediated by the Na+/H+ exchanger. The 50% effective concentration of ATP was about 1.4 μM. ADP similarly induced pHi changes, whereas AMP and adenosine were inactive. The pHi changes induced by ATP were dependent on the extracellular Ca2+, and the addition of calcium ionophore A23187 induced similar pHi changes. The results indicate that ATP activates the Na+/H+ exchanger in cultured bovine aortic endothelial cells and the activation is mediated by the P2-purinergic receptor and is dependent on the extracellular Ca2+.

Original languageEnglish
Pages (from-to)1304-1309
Number of pages6
JournalBiochemical and Biophysical Research Communications
Issue number3
Publication statusPublished - May 16 1988

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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