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交感神经对肠道平滑肌及其副交感运动神经产生抑制作用的部位和受体。

The site and receptors responsible for the inhibition by sympathetic nerves of intestinal smooth muscle and its parasympathetic motor nerves.

作者信息

Gillespie J S, Khoyi M A

出版信息

J Physiol. 1977 Jun;267(3):767-89. doi: 10.1113/jphysiol.1977.sp011837.

DOI:10.1113/jphysiol.1977.sp011837
PMID:874878
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1283639/
Abstract
  1. The effects of three inhibitory stimuli, sympathetic nerve stimulation, noradrenaline (NA) and isoprenaline have been examined on three forms of motor activity in the rabbit colon, the response to pelvic (parasympathetic) nerve stimulation, acetylcholine (ACh) and spontaneous tone.2. The response to pelvic nerve stimulation is most effectively inhibited by sympathetic nerve stimulation, much less effectively by NA and hardly at all by isoprenaline. The sympathetic nerves can inhibit the pelvic response at frequencies of stimulation which do not affect spontaneous tone. The inhibitory effect of sympathetic stimulation, and of NA, on the pelvic response is reduced by phentolamine 5 x 10(-6)M and unaffected by propranolol 5 x 10(-6)M suggesting the effect is mediated via alpha receptors.3. The response to ACh is inhibited by all three stimuli equally. The inhibitory effect of sympathetic nerve stimulation and of isoprenaline is reduced by propranolol 5 x 10(-6)M. The inhibitory effect of NA is also reduced by propranolol but to a lesser extent. Phentolamine 5 x 10(-6)M has a small effect in reducing the inhibitory effect of sympathetic nerve stimulation or of NA. This effect of phentolamine is lost if the participation of motor nerves in the response to ACh is excluded by either tetrodotoxin 10(-7) g/ml. or cold storage for 10-14 days. These results suggest that inhibition of the ACh response takes place mainly at the muscle by activation of beta receptors but that ACh may have a small indirect stimulant action through motor nerves and this is susceptible to inhibition through alpha receptors.4. All three stimuli are equally effective in lowering smooth muscle tone. This inhibitory effect of sympathetic nerve stimulation and of isoprenaline is reduced by propranolol 5 x 10(-6)M and unaffected by phentolamine 5 x 10(-6)M. The inhibitory effect of NA is reduced by propranolol but again is less sensitive to block than the other two inhibitory stimuli. Phentolamine is without effect on the inhibitory action of NA and the combination of phentolamine with propranolol is no more effective than propranolol alone. These results suggest that NA liberated by sympathetic nerves and isoprenaline inhibit myogenic tone in the smooth muscle by an action on beta receptors but the action of NA added to the bath cannot be fully explained in this way.
摘要
  1. 研究了三种抑制性刺激,即交感神经刺激、去甲肾上腺素(NA)和异丙肾上腺素,对兔结肠三种运动形式的影响,即对盆神经(副交感神经)刺激的反应、对乙酰胆碱(ACh)的反应和自发张力。

  2. 对盆神经刺激的反应最有效地被交感神经刺激所抑制,被NA抑制的效果要小得多,而异丙肾上腺素几乎没有抑制作用。交感神经能在不影响自发张力的刺激频率下抑制盆神经反应。交感神经刺激和NA对盆神经反应的抑制作用可被5×10⁻⁶M的酚妥拉明降低,而不受5×10⁻⁶M普萘洛尔的影响,提示该作用是通过α受体介导的。

  3. 对ACh的反应被这三种刺激同等程度地抑制。交感神经刺激和异丙肾上腺素的抑制作用可被5×10⁻⁶M的普萘洛尔降低。NA的抑制作用也被普萘洛尔降低,但程度较小。5×10⁻⁶M的酚妥拉明对降低交感神经刺激或NA的抑制作用有较小的影响。如果用10⁻⁷g/ml的河豚毒素或冷藏10 - 14天排除运动神经参与对ACh的反应,酚妥拉明的这种作用就会消失。这些结果表明,对ACh反应的抑制主要通过β受体激活在肌肉处发生,但ACh可能通过运动神经有一个小的间接刺激作用,并且这易受通过α受体的抑制影响。

  4. 这三种刺激在降低平滑肌张力方面同样有效。交感神经刺激和异丙肾上腺素的这种抑制作用可被5×10⁻⁶M的普萘洛尔降低,而不受5×10⁻⁶M酚妥拉明的影响。NA的抑制作用被普萘洛尔降低,但再次表明它对阻断的敏感性低于其他两种抑制性刺激。酚妥拉明对NA的抑制作用没有影响,并且酚妥拉明与普萘洛尔的联合使用并不比单独使用普萘洛尔更有效。这些结果表明,交感神经释放的NA和异丙肾上腺素通过作用于β受体抑制平滑肌的肌源性张力,但加入浴液中的NA的作用不能完全用这种方式解释。

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