Báo cáo hóa học: Detection of epithelial apoptosis in pelvic ileal pouches for ulcerative colitis and familial adenomatous polyposis

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Detection of epithelial apoptosis in pelvic ileal pouches for ulcerative colitis and familial adenomatous polyposis
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Báo cáo hóa học: " Detection of epithelial apoptosis in pelvic ileal pouches for ulcerative colitis and familial adenomatous polyposis"Leal et al. Journal of Translational Medicine 2010, 8:11http://www.translational-medicine.com/content/8/1/11 RESEARCH Open AccessDetection of epithelial apoptosis in pelvic ilealpouches for ulcerative colitis and familialadenomatous polyposisRaquel F Leal1*, Maria de Lourdes S Ayrizono1, Marciane Milanski2, João J Fagundes1, Juliana C Moraes2,Luciana R Meirelles3, Lício A Velloso2, Cláudio SR Coy1 Abstract Background: Ileal pouch-anal anastomosis (IPAA) is the surgical procedure of choice for patients with refractory ulcerative colitis (UC) and for familial adenomatous polyposis (FAP) with many rectal polyps. Pouchitis is one of the more frequent complications after IPAA in UC patients; however, it is rare in FAP. Objective: Evaluate pro-apoptotic activity in endoscopically and histological normal mucosa of the ileal pouch in patients with UC and FAP. Methods: Eighteen patients (nine with UC and nine with FAP) with J pouch after total rectocolectomy were studied. Biopsies were obtained from the mucosa of the pouch and from normal ileum. The specimens were snap- frozen and the expressions of Bax and Bcl-2 were determined by immunoblot of protein extracts and by immunohistochemistry analysis. FADD, Caspase-8, APAF-1 and Caspase-9 were evaluated by immunoprecipitation and immunoblot. Results: Patients with UC had significantly higher protein levels of Bax and APAF-1, Caspase-9 than patients with FAP, but were similar to controls. The expressions of Bcl-2 and FADD, Caspase-8 were similar in the groups. Immunohistochemistry for Bax showed less intensity of immunoreactions in FAP than in UC and Controls. Bcl-2 immunostaining was similar among the groups. Conclusion: Patients with FAP present lower levels of pro-apoptotic proteins in all methods applied, even in the absence of clinical and endoscopic pouchitis and dysplasia in the histological analysis. These findings may explain a tendency of up-regulation of apoptosis in UC patients, resulting in higher rates of progression to pouchitis in these patients, which could correlate with mucosal atrophy that occurs in inflamed tissue. However, FAP patients had low pro-apoptotic activity in the mucosa, and it could explain the tendency to low cell turn over and presence of adenomas in this syndrome.Backgroud affects up to 50% of patients with UC, and only 5% ofRestorative rectocolectomy with ileal pouch and anal patients with FAP [4-6].anastomosis (IPAA) has become the surgical procedure Although pouchitis is a commonly reported complica-of choice for ulcerative colitis (UC) and for familial ade- tion, its etiology remains unknown [7-11]. Due to thisnomatous polyposis (FAP), for three decades [1-3]. difference in the incidence o f pouchitis, some authorsDespite of its innumerous advantages over other thera- have proposed that the reactivation of UC may have a rolepeutic procedures, restorative retocolectomy with ileal in the induction of the local inflammation and in thepouch may evolve with pouchitis, a complication that increased epithelial apoptosis that will, ultimately, lead to the installation of this complication [12,13]. This hypoth- esis is further boosted by the fact that some patients with pouchitis have resurgence of extra-intestinal manifesta-* Correspondence: raquelleal@mpc.com.br1 tions of UC in the same way as patients who have active Coloproctology Unit of the Surgery Department, University of Campinas(UNICAMP), Medical School, São Paulo, Brazil © 2010 Leal et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Leal et al. Journal of Translational Medicine 2010, 8:11 Page ...