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Sökning: L773:0022 3565 OR L773:1521 0103 > (1995-1999)

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  • Larsson, Christer, et al. (författare)
  • Long-term exposure to ethanol increases the number and function of muscarinic M1 receptors in human neuroblastoma cells
  • 1996
  • Ingår i: Journal of Pharmacology and Experimental Therapeutics. - 1521-0103. ; 278:1, s. 313-319
  • Tidskriftsartikel (refereegranskat)abstract
    • The effect of long-term ethanol exposure on muscarinic receptors was investigated in human neuroblastoma SH-SY5Y cells. Exposure to 100 mM ethanol for 4 days enhanced both peak and steady-state levels of carbachol-stimulated inositol 1,4,5-bisphosphate increase. An ethanol concentration of 50 mM was sufficient for an enhancement of this event. The carbachol-stimulated decrease in [3H]inositol-labeled [3H]phosphatidylnositol 4,5-bisphosphate and increase [3H]inositol trisphosphate and [3H]inositol bisphosphate were also potentiated in ethanol-treated cells, which demonstrated that the receptor-stimulated activation of phospholipase C is augmented. Experiments with pirenzepine showed that carbachol-stimulated inositol 1,4,5-trisphosphate increase is mediated via M1 receptors both in ethanol-treated and control cells. Ethanol exposure for 2 or 4 days also caused an increase in [3H]N-methylscopolamine and [3H]quinuclidinyl benzilate binding sites and elevation of [3H]pirenzepine binding, which indicated that the number of muscarinic M1 receptors is increased in ethanol-treated SH-SY5Y cells. These results demonstrate that long-term exposure to ethanol potentiates muscarinic M1 receptor-stimulated activation of phospholipase C in SH-SY5Y cells. This is likely to be explained by an increased number of muscarinic M1 receptors.
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