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de Oliveira SFV, Ganzinelli M, Chilà R, Serino L, Maciel ME, Urban CDA, de Lima RS, Cavalli IJ, Generali D, Broggini M, Damia G, Ribeiro EMDSF. Characterization of MTAP Gene Expression in Breast Cancer Patients and Cell Lines. PLoS One 2016; 11:e0145647. [PMID: 26751376 PMCID: PMC4709099 DOI: 10.1371/journal.pone.0145647] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 12/07/2015] [Indexed: 01/02/2023] Open
Abstract
MTAP is a ubiquitously expressed gene important for adenine and methionine salvage. The gene is located at 9p21, a chromosome region often deleted in breast carcinomas, similar to CDKN2A, a recognized tumor suppressor gene. Several research groups have shown that MTAP acts as a tumor suppressor, and some therapeutic approaches were proposed based on a tumors´ MTAP status. We analyzed MTAP and CDKN2A gene (RT-qPCR) and protein (western-blotting) expression in seven breast cancer cell lines and evaluated their promoter methylation patterns to better characterize the contribution of these genes to breast cancer. Cytotoxicity assays with inhibitors of de novo adenine synthesis (5-FU, AZA and MTX) after MTAP gene knockdown showed an increased sensitivity, mainly to 5-FU. MTAP expression was also evaluated in two groups of samples from breast cancer patients, fresh tumors and paired normal breast tissue, and from formalin-fixed paraffin embedded (FFPE) core breast cancer samples diagnosed as Luminal-A tumors and triple negative breast tumors (TNBC). The difference of MTAP expression between fresh tumors and normal tissues was not statistically significant. However, MTAP expression was significantly higher in Luminal-A breast tumors than in TNBC, suggesting the lack of expression in more aggressive breast tumors and the possibility of using the new approaches based on MTAP status in TNBC.
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MESH Headings
- Adenocarcinoma, Mucinous/drug therapy
- Adenocarcinoma, Mucinous/genetics
- Adenocarcinoma, Mucinous/metabolism
- Adenocarcinoma, Mucinous/pathology
- Antineoplastic Agents/pharmacology
- Azacitidine/pharmacology
- Carcinoma, Ductal, Breast/drug therapy
- Carcinoma, Ductal, Breast/genetics
- Carcinoma, Ductal, Breast/metabolism
- Carcinoma, Ductal, Breast/pathology
- Carcinoma, Lobular/drug therapy
- Carcinoma, Lobular/genetics
- Carcinoma, Lobular/metabolism
- Carcinoma, Lobular/pathology
- Cell Line, Tumor
- Cyclin-Dependent Kinase Inhibitor p16/genetics
- Cyclin-Dependent Kinase Inhibitor p16/metabolism
- DNA Methylation
- Estrogen Receptor alpha/deficiency
- Estrogen Receptor alpha/genetics
- Female
- Fluorouracil/pharmacology
- Gene Expression Regulation, Neoplastic
- Humans
- Lymphatic Metastasis
- Methotrexate/pharmacology
- Organ Specificity
- Promoter Regions, Genetic
- Purine-Nucleoside Phosphorylase/antagonists & inhibitors
- Purine-Nucleoside Phosphorylase/genetics
- Purine-Nucleoside Phosphorylase/metabolism
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Receptor, ErbB-2/deficiency
- Receptor, ErbB-2/genetics
- Receptors, Progesterone/deficiency
- Receptors, Progesterone/genetics
- Signal Transduction
- Triple Negative Breast Neoplasms/drug therapy
- Triple Negative Breast Neoplasms/genetics
- Triple Negative Breast Neoplasms/metabolism
- Triple Negative Breast Neoplasms/pathology
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Affiliation(s)
| | - Monica Ganzinelli
- Laboratory of Molecular Pharmacology, Department of Oncology, Istituto di Ricerche Farmacologiche ‘‘Mario Negri”, Milan, Lombardia, Italy
| | - Rosaria Chilà
- Laboratory of Molecular Pharmacology, Department of Oncology, Istituto di Ricerche Farmacologiche ‘‘Mario Negri”, Milan, Lombardia, Italy
| | - Leandro Serino
- Department of Genetics, Federal University of Paraná, Curitiba, Paraná, Brazil
| | | | - Cícero de Andrade Urban
- Department of Mastology, Breast Unit, Hospital Nossa Senhora das Graças, Curitiba, Paraná, Brazil
| | - Rubens Silveira de Lima
- Department of Mastology, Breast Unit, Hospital Nossa Senhora das Graças, Curitiba, Paraná, Brazil
| | | | - Daniele Generali
- Laboratorio di Oncologia Molecolare Senologica, U. O. Multidisciplinare di Patologia Mammaria, A. O. Istituti Ospitalieri di Cremona, Cremona, Lombardia, Italy
| | - Massimo Broggini
- Laboratory of Molecular Pharmacology, Department of Oncology, Istituto di Ricerche Farmacologiche ‘‘Mario Negri”, Milan, Lombardia, Italy
| | - Giovanna Damia
- Laboratory of Molecular Pharmacology, Department of Oncology, Istituto di Ricerche Farmacologiche ‘‘Mario Negri”, Milan, Lombardia, Italy
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