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- W1978785847 abstract "1 Double-barrelled ion-selective microelectrodes were used to examine the effects of exogenous noradrenaline upon the membrane potential (Em) and intracellular chloride concentration ([Cl]i) of arterial smooth muscle from the saphenous branch of the femoral artery of the rat. 2 After treatment with 0.6 mM 6-hydroxydopamine (to functionally denervate the tissue), exogenous noradrenaline (5 nM) caused repeatable depolarization of Em from −63.7±2.4 mV (s.d., n=18) to −53.8±3.4 mV (P<0.0001) and increases in [Cl]i from 31.0±0.5 mM to 42.5±2.2 mM (P<0.0001). 3 In the presence of 10 μM bumetanide (an inhibitor of (Na-K-Cl) cotransport), 5 nM noradrenaline caused a depolarization of Em of 3.0±3.2 mV, and a rise in [Cl]i of 4.5±2.5 mM. 4 In the presence of bumetanide and 1 mM acetazolamide (used as an inhibitor of a Na-independent inward Cl pump), noradrenaline had no effect on Em or [Cl]i. 5 In the absence of extracellular chloride, the rise in apparent [Cl]i in response to 5 nM noradrenaline was abolished but there was a depolarization of 2.0±3.9 mV. 6 These results are consistent with the stimulation of (Na-K-Cl) cotransport and a Na-independent Cl pump by exogenous noradrenaline and with the consequent increase in [Cl]i and shift in ECl potentiating the depolarization caused by noradrenaline. The possibility that modulation of [Cl]i may be a general mechanism of Em regulation is discussed. British Journal of Pharmacology (1997) 122, 639–642; doi:10.1038/sj.bjp.0701431" @default.
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- W1978785847 date "1997-10-01" @default.
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- W1978785847 title "Stimulation of intracellular chloride accumulation by noradrenaline and hence potentiation of its depolarization of rat arterial smooth muscle <i>in vitro</i>" @default.
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- W1978785847 doi "https://doi.org/10.1038/sj.bjp.0701431" @default.
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