Combined activity of COX-1 and COX-2 is increased in non-neoplastic colonic mucosa from colorectal neoplasia patients

BMC Gastroenterology

Niels Bindslev¹  Marie Balslev Backe¹  Steen Seier Poulsen¹  Mattias Salling Dahllöf¹  Thorbjørn Søren Rønn Jensen²  Badar Mahmood²  Morten Bach Damm²  Mark Berner Hansen² 

[1] Department of Biomedical Sciences, Faculty of Health Sciences, University of Copenhagen;Digestive Disease Center K, Bispebjerg Hospital;

关键词: Short circuit current (SCC);    Cyclooxygenase;    Endoscopic;    Biopsy;    Carcinogenesis;    Tuft cells;   

DOI  :  10.1186/s12876-018-0759-1

来源: DOAJ

【 摘 要 】

Abstract Background Cyclooxygenase (COX) activity is increased in endoscopic normal colonic mucosa from patients with colorectal neoplasia (CRN). COX-2 is thought to be the predominant COX isozyme involved in neoplasia. Meanwhile, relative contributions of COX-1 and COX-2 isoforms are unknown. Knowledge about their mutual activity in colonic mucosa is important for diagnostics and targeted therapy for CRN. The aim of this study was to assess the relative function, expression and localization of COX-1 and COX-2 enzymes in colonic non-neoplastic human mucosa and thereby to potentially reveal a mucosal disease predisposition for better treatment. Methods Biopsies were pinched from normal appearing colonic mucosa in patients undergoing endoscopy. Ussing chamber technique was applied for an indirect assessment of epithelial activity, RT-qPCR for expression and immunohistochemistry for localization of COX-1 and COX-2 enzymes in patients without (ctrls) and with a history of CRN (CRN-pts). Results Combined COX-1 and COX-2 activity was higher in CRN-pts, p = 0.036. COX-2 was primarily localized in absorptive cells, while COX-1 appeared to be restricted to nonenteroendocrine tuft cells of the colonic epithelium. Conclusions In biopsies from endoscopic normal appearing colonic mucosa, combined activity of COX-1 and COX-2 enzymes is increased in CRN-pts compared with ctrls. This indicates that COX-1 and COX-2 together contribute to an increased proliferation process. Of note, in colonic epithelial cell lining, the COX-1 enzyme seems localized in tuft cells.

【 授权许可】

Unknown