Nuclear localization of MUC1 extracellular domain in breast, head and neck, and colon cancer

Autor: Cecilio G. Alberdi, María Virginia Croce, Ezequiel Lacunza, Marina Teresita Isla Larrain, Sandra O. Demichelis, Martín Enrique Rabassa, Martín Carlos Abba, Amada Segal-Eiras, Luciano Cermignani
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Cancer Research
Pathology
Colorectal cancer
Clinical Biochemistry
MUC1 extracellular domain
Fibrocystic Breast Disease
skin and connective tissue diseases
MUC1
chemistry.chemical_classification
CANCER
Neoplasm Proteins
Nuclear localization
CYTOLPASMIC TAIL
Oncology
Head and Neck Neoplasms
Colonic Neoplasms
NUCLEAR LOCALIZATION
Female
Tumor-associated glycoprotein 72
CIENCIAS NATURALES Y EXACTAS
Subcellular Fractions
medicine.medical_specialty
Otras Ciencias Biológicas
Breast Neoplasms
Adenocarcinoma
Biology
Pathology and Forensic Medicine
Ciencias Biológicas
Cell Line
Tumor
Extracellular
medicine
Humans
Cell Nucleus
Hyperplasia
Neoplasia
Carcinoma
Mucin-1
medicine.disease
digestive system diseases
Protein Structure
Tertiary
chemistry
Fibroadenoma
Cell culture
Cancer cell
Ciencias Médicas
Cancer research
Glycoprotein
Nuclear localization sequence
Zdroj: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
Popis: Background: The glycoprotein MUC1 is overexpressed and underglycosylated in cancer cells. MUC1 is translated as a single polypeptide that undergoes autocleavage into 2 subunits (the extracellular domain and the cytoplasmic tail), and forms a stable heterodimer at the apical membrane of normal epithelial cells. The MUC1 cytoplasmic tail localizes to the cytoplasm of transformed cells and is targeted to the nucleus. Aims: To study the expression of the MUC1 extracellular subunit in cell nuclei of neoplastic breast, head and neck, and colon samples. Materials and methods: 330 primary tumor samples were analyzed: 166 invasive breast carcinomas, 127 head and neck tumors, and 47 colon tumors; 10 benign breast disease (BBD) and 40 normal specimens were also included. A standard immunohistochemical method with antigen retrieval was performed. Nuclear fractions from tissue homogenates and breast cancer cell lines (ZR-75, MDA-MB-231, MCF7, and T47D) were obtained and analyzed by Western blotting (WB). The anti-MUC1 extracellular subunit monoclonal antibody HMFG1 was used for immunohistochemistry. Results: 37/166 breast cancer specimens, 5/127 head and neck cancer specimens, 2/47 colon cancer samples, and 3/10 BBD samples showed immunohistochemical staining at the nuclear level. No nuclear reaction was detected in normal samples. By WB, breast and colon cancer purified nuclear fractions showed reactivity at 200 kDa in 3/30 breast and 3/20 colon cancer samples as well as purified nuclear fractions obtained from breast cancer cell lines. Conclusions: This study shows that the MUC1 extracellular domain might be translocated to the cell nucleus in breast, head and neck, and colon cancer as well as BBD.
Facultad de Ciencias Médicas
Databáze: OpenAIRE
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