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β-胍基丙酸与γ-氨基丁酸在小龙虾肌纤维上的竞争性相互作用。

Competitive interaction of beta-guanidino propionic acid and gamma-aminobutyric acid on the muscle fibre of the crayfish.

作者信息

Feltz A

出版信息

J Physiol. 1971 Jul;216(2):391-401. doi: 10.1113/jphysiol.1971.sp009531.

Abstract
  1. The interaction of beta-guanidino propionic acid and gamma-aminobutyric acid has been investigated on the crayfish muscle by measurement of the membrane conductance.2. The increase in membrane conductance produced by GABA is depressed by beta-guanidino propionic acid. This antagonist acts in a competitive way as shown by the shift of log dose-response curves and by the results of tests for competitive interaction (method of Schild (1947); Lineweaver and Burk's plot).3. Perfusion of GABA was shown to induce a receptor desensitization. As a consequence, the slope of the dose-response curve plotted in Hill's co-ordinates increases when care is taken to minimize this phenomenon. The significance of this slope for establishing the real number of GABA molecules binding with the GABA receptor is discussed.
摘要
  1. 通过测量膜电导,研究了β-胍基丙酸与γ-氨基丁酸在小龙虾肌肉上的相互作用。

  2. β-胍基丙酸可抑制γ-氨基丁酸引起的膜电导增加。这种拮抗剂以竞争性方式起作用,对数剂量-反应曲线的移动以及竞争性相互作用测试结果(Schild(1947年)方法;Lineweaver和Burk图)表明了这一点。

  3. 已证明灌注γ-氨基丁酸会诱导受体脱敏。因此,当注意尽量减少这种现象时,以希尔坐标绘制的剂量-反应曲线的斜率会增加。讨论了该斜率对于确定与γ-氨基丁酸受体结合的γ-氨基丁酸分子实际数量的意义。

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