摘要
本文探讨中枢注射组织胺（HA）增强胃酸分泌的作用机制。雄性SD大鼠重200～300g，用37℃生理盐水做恒速、连续胃灌流。膈下迷走神经切除后，观察第三脑室或外周给药对五肽促胃液素（G－5）诱导的胃酸分泌及对血浆皮质酮水平的影响。结果如下：（1）第三脑室注射1．0μg组织胺增强G－5诱导的胃酸分泌，这作用可为预先肌肉注射苯海拉明8．0μg所阻断。（2）脑室注射促肾上腺皮质激素释放因于（CRF，0.5μg，1．0μg）增强胃酸分泌，且呈量效关系。（3）脑室注射组织胺（1．0μg）提高血浆皮质酮水平。（4）静脉注射小剂量硫酸皮质酮增强胃酸分泌，也呈量效关系。上述结果提示：脑内组织胺H1受体和CRF参与胃酸分泌中枢调节的兴奋机制，传出途径可能与肾上腺释放皮质酮有关。
The present experiment was designed to study the mechanism underlying the stimulatory effect of histamine (HA, icv) on the gastric acid secretion in subdiaphragmatic vagotomized SD rats. Gastric acid was continuously washed out with 37℃ saline by aperfusion pump. Drugs were injected into the third ventricle or the vein to examine theeffect on gastric acid secretion and the level of plasma corticosterone. The results are asfollows: (1) HA (1. 0μg, icv) potentiated gastric acid secretion induced by G- 5,which could be abolished by preintramuscular injection of diphenhydramine hydrochloride (8. 0μg). (2) Corticotropin-releasing factor (CRF) (0. 5μg, 1. 0μg, icv) augmented gastric acid secretion in a dose dependent manner. (3) HA (1. 0μg, icv) increased the plasma corticosterone level. (4) Intravenous injection of corticosterone 21sulfale (15, 30μg) augmented gastric acid secretion in a dose dependent manner. Theseresults suggested that intracerebroventricular injection of HA could stimulate the releaseof CRF by specificably binding with H1 receptor in some areas of hypothalamus,which, in turn, increased gastric acid secretion induced by G-5 via increasing the levelof plasma corticosterone.
出处
《生理学报》
CAS
CSCD
北大核心
1997年第4期439-444,共6页
Acta Physiologica Sinica
关键词
胃酸分泌
组织胺
第三脑室注射
五肽促胃液素
histamine
intracerebroventricular injection
gastric acid secretion
plasma corticosterone
corticotropin-releasing factor (CRF)
