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  • 2000-2004
  • 1990-1994  (1)
  • Muscarinic receptor  (1)
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  • 2000-2004
  • 1990-1994  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Oscillations of receptor-operated cationic current and internal calcium in single guinea-pig ileal smooth muscle cells (1993)
    Springer
    Pflügers Archiv 424 (1993), S. 431-438 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Calcium oscillations ; Muscarinic receptor ; Calcium stores ; G protein ; Heparin ; Ryanodine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract In single cells isolated from guinea-pig ileal smooth muscle, held under voltage clamp at −40 mV or −50 mV by patch pipette in the whole-cell recording mode, carbachol (CCh) evoked an oscillatory inward cationic current. The frequency of current oscillations increased with increasing CCh concentration. CCh-evoked current oscillations were followed very closely by oscillations in intracellular free Ca2+ estimated from the Indo-1 signal, and were abolished by inclusion of EGTA in the pipette solution. Ryanodine and heparin, but not nifedipine, blocked the generation of current oscillations. CCh-evoked current oscillations were abolished upon withdrawal of extracellular calcium and restored upon its reintroduction. Inclusion of GTP[γS] in the pipette solution caused the generation of an oscillatory inward current, which was blocked by ryanodine. The present results are consistent with the hypothesis that CChevoked cationic current is gated by activation of a G protein and is steeply dependent on [Ca2+]i, fluctuations in the release of Ca2+ from stores during carbachol's action produce oscillations in [Ca2+]i which cause similar oscillations in the cationic current.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00374905
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