Peripheral CRF activates myenteric neurons in the proximal colon through CRF1 receptor in conscious rats

被引:63
作者
Miampamba, M
Maillot, C
Million, M
Taché, Y
机构
[1] Univ Calif Los Angeles, Dept Med, Div Digest Dis,CURE DDRC, Vet Affairs Greater Los Angeles Healthcare Syst, Los Angeles, CA 90073 USA
[2] Univ Calif Los Angeles, Brain Res Inst, Los Angeles, CA 90073 USA
来源
AMERICAN JOURNAL OF PHYSIOLOGY-GASTROINTESTINAL AND LIVER PHYSIOLOGY | 2002年 / 282卷 / 05期
关键词
acetylcholine; corticotropin-releasing factor; CP-154,526; enteric nervous system; Fos; NADPH-diaphorase;
D O I
10.1152/ajpgi.00434.2001
中图分类号
R57 [消化系及腹部疾病];
学科分类号
摘要
Corticotropin-releasing factor (CRF) injected peripherally induces clustered spike-burst activity in the proximal colon through CRF1 receptors in rats. We investigated the effect of intraperitoneal CRF on proximal colon ganglionic myenteric cell activity in conscious rats using Fos immunohistochemistry on the colonic longitudinal muscle/myenteric plexus whole mount preparation. In vehicle-pretreated rats, there were only a few Fos immunoreactive (IR) cells per ganglion (1.2 +/- 0.6). CRF (10 mug/kg ip) induced Fos expression in 19.6 +/- 2.1 cells/ ganglion. The CRF1/CRF2 antagonist astressin (33 mug/kg ip) and the selective CRF1 antagonist CP-154,526 (20 mg/kg sc) prevented intraperitoneal CRF-induced Fos expression in the proximal colon (number of Fos-IR cells/ ganglion: 2.7 +/- 1.2 and 1.0 +/- 1.0, respectively), whereas atropine (1 mg/kg sc) had no effect. Double labeling of Fos with protein gene product 9.5 revealed the neuronal identity of activated cells that were encircled by varicose fibers immunoreactive to vesicular acetylcholine transporter. Fos immunoreactivity was mainly present in choline acetyltransferase-IR nerve cell bodies but not in the NADPH-diaphorase-positive cells. These results indicate that peripheral CRF activates myenteric cholinergic neurons in the proximal colon through CRF1 receptor.
引用
收藏
页码:G857 / G865
页数:9
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