title: Expression of estrogen receptor co-regulators NCoR and PELP1 in epithelial cells and myofibroblasts of colorectal carcinomas: cytoplasmic translocation of NCoR in epithelial cells correlates with better [corrected] prognosis.
abstract: Proline-, glutamic acid-, and leukine-rich protein (PELP1) is a novel co-regulatory protein that modulates genomic and non genomic actions of estrogen receptors. Nuclear receptor co-repressor (NCoR) represses estrogen-receptor-dependent transcription. PELP1 and NCoR expression was evaluated in tissue sections from 107 formalin-fixed, paraffin-embedded colectomy specimens. Normal mucosa and adenomas were also evaluated in 77 and 29 cases, respectively. PELP1 was expressed in a dot-like pattern in the nuclei of epithelial and stromal cells. Statistical analysis revealed an increase in PELP1 expression in myofibroblasts from normal mucosa through adenomas to carcinomas. NCoR was expressed in the nuclei and the cytoplasm of epithelial cells. Nuclear expression was more common in normal mucosa, whereas cytoplasmic expression was higher in malignant epithelial cells. Additionally, NCoR was expressed in the cytoplasm of cancer-associated myofibroblasts, but was rarely noted in myofibroblasts of normal mucosa or adenomas. Cytoplasmic expression of NCoR in epithelial cells correlated with better disease-free and overall survival on univariate analysis and was an independent prognostic marker for disease-free survival on multivariate analysis. These findings suggest that deregulation of co-regulators expression in both epithelial cells and myofibroblasts may contribute to the initiation and progression of colorectal carcinoma.
authors.affiliation: Department of Anatomy and Histology-Embryology, University of Patras, 26500, Rion, Greece.
authors.forename: Vassiliki
authors.initials: V
authors.lastname: Tzelepi
authors.forename: Petros
authors.initials: P
authors.lastname: Grivas
authors.forename: Zinovia
authors.initials: Z
authors.lastname: Kefalopoulou
authors.forename: Haralabos
authors.initials: H
authors.lastname: Kalofonos
authors.forename: John N
authors.initials: JN
authors.lastname: Varakis
authors.forename: Georgia
authors.initials: G
authors.lastname: Sotiropoulou-Bonikou
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000473:pathology; D000236:Adenoma / Q000378:metabolism / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000378:metabolism; D056970:Co-Repressor Proteins; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology; D003593:Cytoplasm / Q000378:metabolism; D018450:Disease Progression; D004847:Epithelial Cells / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005347:Fibroblasts / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009687:Nuclear Proteins / Q000378:metabolism*; D056971:Nuclear Receptor Co-Repressor 1; D011379:Prognosis; D011960:Receptors, Estrogen / Q000378:metabolism*; D012097:Repressor Proteins / Q000378:metabolism*; D016019:Survival Analysis; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors
chemical_list: D014408:Biomarkers, Tumor; D056970:Co-Repressor Proteins; C539127:NCOR1 protein, human; D009687:Nuclear Proteins; D056971:Nuclear Receptor Co-Repressor 1; C438485:PELP1 protein, human; D011960:Receptors, Estrogen; D012097:Repressor Proteins; D015534:Trans-Activators; D014157:Transcription Factors