title: The expression of E-cadherin and catenins in colorectal tumours from familial adenomatous polyposis patients.
abstract: Familial adenomatous polyposis patients (FAP) harbour a germline mutation of the adenomatous polyposis coli gene (APC), and APC mutations are early events in the development of sporadic colorectal neoplasms. The APC protein interacts with beta-catenin and gamma-catenin and APC mutations are believed to play a role in the altered levels of beta-catenin in colorectal tumours. Immunohistochemical studies have shown changes in the expression and distribution of E-cadherin and catenins in sporadic colorectal neoplasms. This study assessed the expression and distribution of E-cadherin and catenins in colorectal neoplasms and non-neoplastic mucosa from FAP patients. The expression and cellular distribution of E-cadherin and catenins were studied by immunohistochemistry in 61 adenomas, five carcinomas, and non-neoplastic mucosa from 18 FAP patients. mRNA levels in the carcinomas were studied by in situ hybridization. The expression of E-cadherin and catenins was increased in over 80% of the adenomas, with evident cytoplasmic immunoreactivity. There was increased expression of E-cadherin and catenin in the carcinomas, with a notable increase in the levels of mRNA, in comparison with the non-neoplastic mucosa.
authors.affiliation: Histopathology Department, Hammersmith Hospital, London, UK.
authors.forename: Mona A
authors.initials: MA
authors.lastname: El-Bahrawy
authors.forename: Ian C
authors.initials: IC
authors.lastname: Talbot
authors.forename: Richard
authors.initials: R
authors.lastname: Poulsom
authors.forename: Rosemary
authors.initials: R
authors.lastname: Jeffery
authors.forename: Malcolm R
authors.initials: MR
authors.lastname: Alison
mesh_terms: D011125:Adenomatous Polyposis Coli / Q000378:metabolism*; D000293:Adolescent; D000328:Adult; D015820:Cadherins / Q000235:genetics / Q000378:metabolism*; D015179:Colorectal Neoplasms / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000378:metabolism*; D051180:Desmoplakins; D004848:Epithelium / Q000378:metabolism; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D017403:In Situ Hybridization; D007413:Intestinal Mucosa / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D012334:RNA, Neoplasm / Q000235:genetics; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism; D015854:Up-Regulation; D051178:alpha Catenin; D051176:beta Catenin; D051185:gamma Catenin
chemical_list: C495273:CTNNA1 protein, human; C495270:CTNNB1 protein, human; D015820:Cadherins; D003598:Cytoskeletal Proteins; D051180:Desmoplakins; C495292:JUP protein, human; D009363:Neoplasm Proteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D015534:Trans-Activators; D051178:alpha Catenin; D051176:beta Catenin; D051185:gamma Catenin