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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Coupling of a P2Z-like purinoceptor to a fatty acid-activated K+ channel in toad gastric smooth muscle cells

Zou, H. and Ugur, M. and Drummond, R.M. and Singer, J.J. (2001) Coupling of a P2Z-like purinoceptor to a fatty acid-activated K+ channel in toad gastric smooth muscle cells. Journal of Physiology, 534 (1). pp. 59-70. ISSN 0022-3751

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Abstract

1. Extracellular application of ATP generates two whole-cell currents in toad gastric smooth muscle cells: an immediate inward non-selective cation current (due to the activation of a P2X or P2Z-like receptor) and a slowly developing outward K+ current. The inward non-selective cation current depends on the continuous presence of ATP while the outward K+ current can last for minutes after ATP application ceases. 2. In cell-attached patches, application of ATP to the extra-patch membrane can activate K+ channels in the patch indicating that a diffusible cellular messenger may be involved. The characteristics of these K+ channels are similar to those of a previously described fatty acid-activated K+ channel that is also a stretch-activated channel. 3. This whole-cell K+ current can be induced by ATP in the absence of extracellular Ca2+ (with EGTA present to chelate trace amounts). However, the current generated in the presence of extracellular Ca2+ is considerably larger. 4. The pharmacological profiles for the activation of the non-selective cation current and the K+ current are similar, suggesting that the same P2Z-like receptor could be mediating both responses. This type of plasma membrane receptor/channel-channel coupling by a process that does not appear to involve Ca2+ flow through the receptor/channel or a subsequent membrane potential change may be representative of a new class of signalling mechanisms.