Stress-induced Alterations in Mast Cell Numbers and Proteinase-activated Receptor-2 Expression of the Colon: Role of Corticotrophin-releasing Factor.
10.3346/jkms.2010.25.9.1330
- Author:
Dong Hoon KIM
1
;
Young Ju CHO
;
Jang Hee KIM
;
Young Bae KIM
;
Kwang Jae LEE
Author Information
1. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea. kjleemd@hotmail.com
- Publication Type:Original Article ; Research Support, Non-U.S. Gov't
- Keywords:
Corticotropin-releasing Factor;
Enterochromaffin Cells;
Irritable Bowel Syndrome;
Mast cells;
Receptor, PAR-2;
Stress
- MeSH:
Animals;
Colon/*metabolism;
Corticotropin-Releasing Hormone/antagonists & inhibitors/metabolism/pharmacology/*physiology;
Enterochromaffin Cells/cytology;
Male;
Mast Cells/*cytology/immunology/metabolism;
Peptide Fragments/pharmacology;
Rats;
Rats, Wistar;
Receptor, PAR-2/*metabolism;
Restraint, Physical;
*Stress, Physiological
- From:Journal of Korean Medical Science
2010;25(9):1330-1335
- CountryRepublic of Korea
- Language:English
-
Abstract:
This study was performed in order to assess whether acute stress can increase mast cell and enterochromaffin (EC) cell numbers, and proteinase-activated receptor-2 (PAR2) expression in the rat colon. In addition, we aimed to investigate the involvement of corticotrophin-releasing factor in these stress-related alterations. Eighteen adult rats were divided into 3 experimental groups: 1) a saline-pretreated non-stressed group, 2) a saline-pretreated stressed group, and 3) an astressin-pretreated stressed group. The numbers of mast cells, EC cells, and PAR2-positive cells were counted in 6 high power fields. In proximal colonic segments, mast cell numbers of stressed rats tended to be higher than those of non-stressed rats, and their PAR2-positive cell numbers were significantly higher than those of non-stressed rats. In distal colonic segments, mast cell numbers and PAR2-positive cell numbers of stressed rats were significantly higher than those of non-stressed rats. Mast cell and PAR2-positive cell numbers of astressin-pretreated stressed rats were significantly lower than those of saline-pretreated stressed rats. EC cell numbers did not differ among the three experimental groups. Acute stress in rats increases mast cell numbers and mucosal PAR2 expression in the colon. These stress-related alterations seem to be mediated by release of corticotrophin-releasing factor.
