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Title: ATP crossing the cell plasma membrane generates an ionic current in Xenopus oocytes
Author: Bodas, Elena
Aleu, Jordi
Pujol, Gemma
Martín Satué, Mireia
Marsal Tebé, Jordi
Solsona Sancho, Carles
Keywords: Trifosfat d'adenosina
Membranes cel·lulars
Canals iònics
Adenosine triphospahatase
Cell membranes
Ion channels
Issue Date: 7-Jul-2000
Publisher: American Society for Biochemistry and Molecular Biology
Abstract: The presence of ATP within cells is well established. However, ATP also operates as an intercellular signal via specific purinoceptors. Furthermore, nonsecretory cells can release ATP under certain experimental conditions. To measure ATP release and membrane currents from a single cell simultaneously, we used Xenopus oocytes. We simultaneously recorded membrane currents and luminescence. Here, we show that ATP release can be triggered in Xenopus oocytes by hyperpolarizing pulses. ATP release (3.2 +/- 0.3 pmol/oocyte) generated a slow inward current (2.3 +/- 0.1 microA). During hyperpolarizing pulses, the permeability for ATP(4-) was more than 4000 times higher than that for Cl(-). The sensitivity to GdCl(3) (0. 2 mm) of hyperpolarization-induced ionic current, ATP release and E-ATPase activity suggests their dependence on stretch-activated ion channels. The pharmacological profile of the current inhibition coincides with the inhibition of ecto-ATPase activity. This enzyme is highly conserved among species, and in humans, it has been cloned and characterized as CD39. The translation, in Xenopus oocytes, of human CD39 mRNA encoding enhances the ATP-supported current, indicating that CD39 is directly or indirectly responsible for the electrodiffusion of ATP.
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It is part of: Journal of Biological Chemistry, 2000, vol. 275, num. 27, p. 20268-20273
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ISSN: 0021-9258
Appears in Collections:Articles publicats en revistes (Patologia i Terapèutica Experimental)
Articles publicats en revistes (Biologia Cel·lular, Fisiologia i Immunologia)
Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))

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