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豚鼠输精管的单脉冲刺激与突触前受体假说

Single pulse stimulation of guinea-pig vas deferens and the presynaptic receptor hypothesis.

作者信息

Kalsner S

出版信息

Br J Pharmacol. 1979 Jun;66(2):343-9. doi: 10.1111/j.1476-5381.1979.tb13686.x.

Abstract

1 The effect of phenoxybenzamine on the efflux of [3H]-noradrenaline and the mechanical response to single pulse excitation of superfused guinea-pig vas deferens was determined to examine the validity of the currently accepted hypothesis of a presynaptic negative feedback system on adrenergic nerve terminals. 2 The adrenoceptor antagonist enhanced both the outflow of tritium and the mechanical response to single pulse stimulation. The efflux of labelled material and the responses to 4 pulses were also enhanced, as expected. 3 Blockade of neuronal and extraneuronal uptake did not by itself increase nerve-induced outflow or the mechanical response nor dated within the framework of a hypothesis that proposes that the enhancement of response and tritium efflux by phenoxybenzamine results from blockade of a feedback system whereby noradrenaline released by previous impulses inhibits its own subsequent release.

摘要
  1. 测定了酚苄明对[3H]-去甲肾上腺素流出以及对灌流豚鼠输精管单脉冲刺激的机械反应的影响,以检验当前被广泛接受的关于肾上腺素能神经末梢突触前负反馈系统假说的有效性。2. 肾上腺素能受体拮抗剂增强了氚的流出以及对单脉冲刺激的机械反应。正如预期的那样,标记物质的流出以及对4个脉冲的反应也增强了。3. 神经元和非神经元摄取的阻断本身并不会增加神经诱导的流出或机械反应,也不符合这样一种假说框架,该假说认为酚苄明引起的反应增强和氚流出是由于反馈系统的阻断,即先前冲动释放的去甲肾上腺素抑制其随后的释放。

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