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X射线照射会减弱兔耳动脉的舒张反应。

X-irradiation attenuates relaxant responses in the rabbit ear artery.

作者信息

Maynard K I, Stewart-Lee A L, Milner P, Burnstock G

机构信息

Department of Anatomy and Developmental Biology, University College London.

出版信息

Br J Pharmacol. 1992 Jan;105(1):126-8. doi: 10.1111/j.1476-5381.1992.tb14222.x.

Abstract
  1. The relaxant actions of acetylcholine, substance P and calcitonin gene-related peptide, and the levels of neuropeptide Y and calcitonin gene-related peptide were assessed in the rabbit central ear artery 1, 4 and 6 weeks after a single dose of 45 Gy X-irradiation, a dose similar to that used clinically in intraoperative radiotherapy. 2. Relaxant responses induced by acetylcholine and substance P (both endothelium-dependent) and calcitonin gene-related peptide (endothelium-independent) were reduced, and endogenous neuropeptide Y and calcitonin gene-related peptide levels were unaffected after X-irradiation. 3. The mechanism(s) by which a single dose of 45 Gy X-irradiation may selectively damage relaxant, but not direct, contractile responses of the smooth muscle (as we have shown previously) of the rabbit central ear artery are discussed.
摘要
  1. 在单次给予45 Gy X射线照射(该剂量与术中放疗临床使用剂量相似)后1周、4周和6周,对兔中耳动脉中乙酰胆碱、P物质和降钙素基因相关肽的舒张作用以及神经肽Y和降钙素基因相关肽的水平进行了评估。2. X射线照射后,乙酰胆碱和P物质(两者均为内皮依赖性)以及降钙素基因相关肽(内皮非依赖性)诱导的舒张反应降低,而内源性神经肽Y和降钙素基因相关肽水平未受影响。3. 讨论了单次45 Gy X射线照射可能选择性损伤兔中耳动脉平滑肌舒张反应(如我们之前所示)而非直接收缩反应的机制。

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