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猫胆总管十二指肠连接处肾上腺素能受体的体外功能

Adrenoceptor functions in the cat choledochoduodenal junction in vitro.

作者信息

Persson C G

出版信息

Br J Pharmacol. 1971 Jul;42(3):447-61. doi: 10.1111/j.1476-5381.1971.tb07130.x.

DOI:10.1111/j.1476-5381.1971.tb07130.x
PMID:4397804
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1665674/
Abstract
  1. The effects of alpha- and beta-adrenoceptor stimulating agents were investigated on three different kinds of preparation of the isolated sphincter of Oddi and on the duodenum of the cat.2. Adrenaline (1.5 x 10(-7)M-6.3 x 10(-7)M), noradrenaline (1.6 x 10(-7)M-6.3 x 10(-7)M), and tyramine (2.9 x 10(-6)M-5.8 x 10(-6)M) increased the activity and tonus of the sphincter musculature and decreased duodenal activity and tone. The effect on the sphincter resulted in increased resistance to flow through the sphincter. The excitatory effects on the sphincter were blocked by phenoxybenzamine (1.7 x 10(-8)M-1.7 x 10(-7)M).3. No effect was produced by tyramine in concentrations up to 4.6 x 10(-5)M on sphincters taken from reserpinized cats. It is suggested that the cat sphincter of Oddi contains adrenergic nerves of functional importance.4. Isoprenaline (1.9 x 10(-8)M-4.7 x 10(-7)M) and terbutaline (3.5 x 10(-7)M-8.8 x 10(-6)M) decreased spontaneous activity and tonus of the sphincter, and diminished resistance to flow through the sphincter. Both agents decreased spontaneous activity and tonus of the duodenum. On a molar basis, isoprenaline was 2-18 times more active than terbutaline on the sphincter and 35-90 times more active on the duodenum. The effects of isoprenaline and terbutaline were blocked by propranolol (3.9 x 10(-7)M).5. It is concluded that the cat sphincter of Oddi contains alpha-adrenoceptors active in contraction of the sphincter, and beta-adrenoceptors active in its relaxation. The beta-adrenoceptors of the sphincter differ from those in the duodenum; it is suggested that they belong to the beta(2)-group (according to Lands' classification).6. The automaticity of the isolated sphincter of Oddi resembled the sphincter activity recorded in vivo and is probably myogenic in nature, as it resisted treatment with phenoxybenzamine (1.7 x 10(-8)M-1.7 x 10(-7)M), atropine (1.4 x 10(-6)M-5.8 x 10(-6)M), hexamethonium (1.4 x 10(-5)M-1.1 x 10(-4)M) and tetrodotoxin (1 mug/ml). The activity of the sphincter has no propulsive function but prevents passage of fluid through the sphincter.
摘要
  1. 研究了α-和β-肾上腺素能受体激动剂对猫离体Oddi括约肌的三种不同制剂以及十二指肠的作用。

  2. 肾上腺素(1.5×10⁻⁷M - 6.3×10⁻⁷M)、去甲肾上腺素(1.6×10⁻⁷M - 6.3×10⁻⁷M)和酪胺(2.9×10⁻⁶M - 5.8×10⁻⁶M)可增加括约肌肌肉组织的活性和张力,并降低十二指肠的活性和张力。对括约肌的作用导致通过括约肌的血流阻力增加。对括约肌的兴奋作用被酚苄明(1.7×10⁻⁸M - 1.7×10⁻⁷M)阻断。

  3. 高达4.6×10⁻⁵M浓度的酪胺对利血平化猫的括约肌无作用。提示猫Oddi括约肌含有具有功能重要性的肾上腺素能神经。

  4. 异丙肾上腺素(1.9×10⁻⁸M - 4.7×10⁻⁷M)和特布他林(3.5×10⁻⁷M - 8.8×10⁻⁶M)可降低括约肌的自发活性和张力,并降低通过括约肌的血流阻力。两种药物均降低十二指肠的自发活性和张力。以摩尔为基础,异丙肾上腺素对括约肌的活性比对特布他林高2 - 18倍,对十二指肠的活性高35 - 90倍。异丙肾上腺素和特布他林的作用被普萘洛尔(3.9×10⁻⁷M)阻断。

  5. 得出结论,猫Oddi括约肌含有在括约肌收缩中起作用的α-肾上腺素能受体和在其舒张中起作用β-肾上腺素能受体。括约肌的β-肾上腺素能受体与十二指肠中的不同;提示它们属于β₂组(根据Lands分类)。

  6. 离体Oddi括约肌的自律性类似于体内记录的括约肌活动,可能本质上是肌源性的,因为它对酚苄明(1.7×10⁻⁸M - 1.7×10⁻⁷M)、阿托品(1.4×10⁻⁶M - 5.8×10⁻⁶M)、六甲铵(1.4×10⁻⁵M - 1.1×10⁻⁴M)和河豚毒素(1微克/毫升)的处理有抵抗力。括约肌的活动无推进功能,但可防止液体通过括约肌。

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SELECTIVE UPTAKE OF SOME CATECHOLAMINES BY THE ISOLATED HEART AND ITS INHIBITION BY COCAINE AND PHENOXYBENZAMINE.离体心脏对某些儿茶酚胺的选择性摄取及其受可卡因和苯氧苄胺的抑制作用
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