Abstract
Systemic injection of corticotropin-releasing factor (CRF) stimulates colonic secretory and motor functions, and CRF receptors play a role in stress-related alterations of colonic functions. Stress has also been reported to induce diarrhea and we investigated if peripheral injection of CRF can mimic this response in conscious rats. Intravenous (i.v.) injection of CRF (3, 10 or 30 μg/kg) caused diarrhea in 13%, 63% and 75% of rats, respectively, and dose dependently increased the fecal fluid content by 5.1-, 8.6- and 10.8-fold, while the dried solid weight was increased by 5.2-, 4.9- and 5.8-fold, respectively, compared to the i.v. saline group. CRF actions were rapid in onset and blocked by the CRF 1 receptor, antagonist CP-154,526 (butyl-[2,5-dimethyl-7-(2,4,6-trimethylphenyl)-7 H-pyrrolo[2,3- d]pyrimidin-4-yl]ethylamine). These results demonstrate that peripheral CRF induces watery diarrhea, primarily through the activation of CRF 1 receptor suggesting a possible role for these pathways in colonic responses to stress.
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