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5-羟色胺刺激丽蝇离体唾液腺时的膜通透性变化。

Membrane permeability changes during stimulation of isolated salivary glands of Calliphora by 5-hydroxytryptamine.

作者信息

Berridge M J, Lindley B D, Prince W T

出版信息

J Physiol. 1975 Jan;244(3):549-67. doi: 10.1113/jphysiol.1975.sp010812.

Abstract
  1. The membrane resistance of isolated salivary glands was found to decrease in response to 5-HT. The change in resistance was calcium-dependent. 2. The resistance change of the apical membrane was found to be much greater than the change in resistance of the basal membrane. 3. Potential responses under current-clamped conditions showed that one part of the biphasic response to 5-HT (attributed to an increase in chloride permeability) could be reversed and the other part (attributed to an increase in a potassium pump) could not. 4. These observations have been incorporated into a model which, on evaluation, predicts all of the observed potential changes during the action of 5-HT. It suggests that the potential responses reflect changes in the internal chloride concentration produced by the calcium-dependent increases in chloride permeability.
摘要
  1. 研究发现,分离出的唾液腺的膜电阻会因5-羟色胺(5-HT)而降低。电阻变化依赖于钙。2. 发现顶端膜的电阻变化远大于基底膜的电阻变化。3. 在钳制电流条件下的电位反应表明,对5-HT双相反应的一部分(归因于氯离子通透性增加)可以逆转,而另一部分(归因于钾泵增加)则不能。4. 这些观察结果已被纳入一个模型,经评估,该模型预测了5-HT作用期间所有观察到的电位变化。这表明电位反应反映了由氯离子通透性的钙依赖性增加所导致的细胞内氯离子浓度的变化。

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