Intracisternal TRH analog increases gastrin release and corpus histidine decarboxylase activity in rats.

Intracisternal TRH analog increases gastrin release and corpus histidine decarboxylase activity in rats.
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脑池内 TRH 类似物增加大鼠胃泌素释放和体内组氨酸脱羧酶活性。

DOI:
10.1152/ajpgi.1999.276.4.g901
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发表时间:
1999
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Taché,Y
Taché,Y
中科院分区:
--
文献类型:
--
作者:
Song,M;Yang,H;Walsh,JH;Ohning,G;Wong,H;Taché,Y

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促甲状腺激素释放激素(TRH)作用于脑干核团,诱导迷走神经介导的胃分泌刺激。在48 h禁食清醒大鼠中研究了脑池内注射TRH类似物RX-77368对血浆胃泌素水平和组氨酸脱羧酶(HDC)活性的影响。RX-77368(25-100 ng)在30 min时使血浆胃泌素水平增加3倍,在注射后2和4 h仍显著高于对照组。在注射后2 h,HDC活性开始增加,并在4 h达到峰值,在50 ng时观察到21倍的最大响应。形态学的变化,在体HDC免疫反应阳性细胞的外观与HDC活性。胃泌素单克隆抗体预处理完全阻止了RX-77368对HDC活性的刺激作用。阿托品显著减弱30 min时的胃泌素升高26%。这些结果表明,在清醒禁食大鼠,TRH类似物在脑内作用于增加肠嗜铬样细胞中的HDC体活性,这涉及由中枢TRH类似物刺激的胃泌素释放。
Thyrotropin-releasing hormone (TRH) acts in brain stem nuclei to induce vagally mediated stimulation of gastric secretion. The effects of intracisternal injection of the TRH analog RX-77368 on plasma gastrin levels and corpus histidine decarboxylase (HDC) activity were studied in 48-h fasted conscious rats. RX-77368 (25–100 ng) increased plasma gastrin levels by threefold at 30 min, which remained significantly higher than control at 2 and 4 h postinjection. Corpus HDC activity began to increase at 2 h and reached a peak at 4 h postinjection with a 21-fold maximum response observed at 50 ng. Morphological changes in the appearance of corpus HDC-immunoreactive cells correlated well with HDC activity. Pretreatment with gastrin monoclonal antibody completely prevented RX-77368 stimulatory effects on HDC activity. Atropine significantly attenuated gastrin increase at 30 min by 26%. These results indicated that in conscious fasted rats, TRH analog acts in the brain to increase corpus HDC activity in the enterochromaffin-like cells, which involves gastrin release stimulated by central TRH analog.
在完全隔离、血管灌注的大鼠胃中,胃泌素在酸分泌之前立即产生剂量依赖性组胺释放。
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