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普萘洛尔和地尔硫䓬对豚鼠颈上神经节神经节传递的频率依赖性抑制作用

Frequency-dependent depression of ganglionic transmission by propranolol and diltiazem in the superior cervical ganglion of the guinea-pig.

作者信息

Ito H, Nishi K

出版信息

Br J Pharmacol. 1982 Oct;77(2):359-62. doi: 10.1111/j.1476-5381.1982.tb09305.x.

Abstract

1 Effects of propranolol and diltiazem on ganglionic transmission in the superior cervical ganglion of the guinea-pig were investigated with intracellular recording techniques. 2 Propranolol and diltiazem (5 X 10(-6)-10(-5) M) induced a transmission failure in the ganglion upon preganglionic nerve stimulation at high frequency (25-30 Hz) without affecting action potentials induced by direct stimulation of the soma membrane, or potentials induced by iontophoretically applied acetylecholine. 3 The results suggest that propranolol and diltiazem may act on preganglionic nerve terminals to inhibit Ca2+ influx in a frequency-dependent manner. These agents may depress excess sympathetic activity without much affecting normal ganglionic transmission.

摘要
  1. 采用细胞内记录技术,研究了普萘洛尔和地尔硫䓬对豚鼠颈上神经节神经节传递的影响。2. 普萘洛尔和地尔硫䓬(5×10⁻⁶ - 10⁻⁵ M)在高频(25 - 30 Hz)刺激节前神经时,可导致神经节传递失败,而不影响直接刺激胞体膜所诱发的动作电位,或离子透入法施加乙酰胆碱所诱发的电位。3. 结果表明,普萘洛尔和地尔硫䓬可能作用于节前神经末梢,以频率依赖性方式抑制Ca²⁺内流。这些药物可能抑制过度的交感神经活动,而对正常的神经节传递影响不大。

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