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Epigenetics breast

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https://www.readbyqxmd.com/read/28210910/astrocyte-induced-reelin-expression-drives-proliferation-of-her2-breast-cancer-metastases
#1
Rahul Jandial, Cecilia Choy, Danielle M Levy, Mike Y Chen, Khairul I Ansari
Breast cancer metastasis to the brain develops after a clinical latency of years to even decades, suggesting that colonization of the brain is the most challenging step of the metastatic cascade. However, the underlying mechanisms used by breast cancer cells to successfully colonize the brain's microenvironment remain elusive. Reelin is an archetypal extracellular glycoprotein that regulates migration, proliferation, and lamination of neurons. It is epigenetically silenced in various cancers, and its expression in multiple myelomas is linked to poor patient survival...
February 17, 2017: Clinical & Experimental Metastasis
https://www.readbyqxmd.com/read/28202042/hoxc8-regulates-self-renewal-differentiation-and-transformation-of-breast-cancer-stem-cells
#2
Mansi Shah, Ryan Cardenas, Belinda Wang, Jenny Persson, Nigel P Mongan, Anna Grabowska, Cinzia Allegrucci
BACKGROUND: Homeobox genes are master regulators of cell fate during embryonic development and their expression is altered in cancer. By regulating the balance between cell proliferation and differentiation, they maintain homeostasis of normal tissues. Here, we screened the expression of homeobox genes in mammary stem cells to establish their role in stem cells transformation in breast cancer. METHODS: Using a Homeobox Genes PCR array, we screened 83 homeobox genes in normal cancer breast stem/progenitor cells isolated by flow cytometry...
February 16, 2017: Molecular Cancer
https://www.readbyqxmd.com/read/28194204/relationship-between-breastfeeding-factors-and-breast-cancer-in-women-referred-to-seyed-al-shohada-hospital-in-isfahan-iran
#3
Farahnaz Jafari-Mehdiabad, Mitra Savabi-Esfahani, Fariborz Mokaryan, Ashraf Kazemi
BACKGROUND: Breast cancer is the most common malignancy and a major cause of cancer deaths among women. Breastfeeding is presented as a probable protective factor against breast cancer, however, the effect of different breastfeeding patterns and duration of breastfeeding on this factor is not well determined. Thus, the aim of this research was to evaluate factors related to breastfeeding and breast cancer. MATERIALS AND METHODS: This case-control study was conducted on 98 women with breast cancer and 198 healthy women who were selected through systematic random sampling method...
November 2016: Iranian Journal of Nursing and Midwifery Research
https://www.readbyqxmd.com/read/28178655/chl1-hypermethylation-as-a-potential-biomarker-of-poor-prognosis-in-breast-cancer
#4
Esperanza Martín-Sánchez, Saioa Mendaza, Ane Ulazia-Garmendia, Iñaki Monreal-Santesteban, Idoia Blanco-Luquin, Alicia Córdoba, Francisco Vicente-García, Noemí Pérez-Janices, David Escors, Diego Megías, Paula López-Serra, Manel Esteller, José Juan Illarramendi, David Guerrero-Setas
The CHL1 gene encodes a cell-adhesion molecule proposed as being a putative tumour-suppressor gene in breast cancer (BC). However, neither the underlying molecular mechanisms nor the clinical value of CHL1 downregulation in BC has been explored. The methylation status of three CpG sites in the CHL1 promoter was analysed by pyrosequencing in neoplastic biopsies from 142 patients with invasive BC and compared with that of non-neoplastic tissues. We found higher CHL1 methylation levels in breast tumours than in non-neoplastic tissues, either from mammoplasties or adjacent-to-tumour, which correlated with lower levels of protein expression in tumours measured by immunohistochemistry...
February 2, 2017: Oncotarget
https://www.readbyqxmd.com/read/28167342/cellular-transformation-of-human-mammary-epithelial-cells-by-satb2
#5
Wei Yu, Yiming Ma, Augusto C Ochoa, Sharmila Shankar, Rakesh K Srivastava
Breast tumors are heterogeneous and carry a small population of progenitor cells that can produce various subtypes of breast cancer. SATB2 (special AT-rich binding protein-2) is a newly identified transcription factor and epigenetic regulator. It is highly expressed in embryonic stem cells, but not in adult tissues, and regulates pluripotency-maintaining factors. However, the molecular mechanisms by which SATB2 induces transformation of human mammary epithelial cells (HMECs) leading to malignant phenotype are unknown...
February 1, 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28164568/methylation-analysis-of-brca1-and-apc-in-breast-cancer-and-it-s-relationship-to-clinicopathological-features
#6
Halaleh Shakeri, Ashraf Fakhrjou, Alireza Nikanfar, Seyyed M Mohaddes-Ardebili
BACKGROUND: Promoter methylation of tumor suppressor genes is an important epigenetic alteration that occurs in the primary stages of human tumors, including breast cancer. Identification of methylated genes and their relationship to clinical features can contribute to the prognosis and early detection of tumors. In this study, we explored the methylation status of APC and BRCA1 genes and their relationship to clinical factors in breast cancer patients. METHODS: BRCA1 and APC promoter methylation was examined by methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA) assay in formalin-fixed paraffin embedded (FFPE) breast tissue from 75 patients...
December 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28155687/subtype-specific-cpg-island-shore-methylation-and-mutation-patterns-in-30-breast-cancer-cell-lines
#7
Heejoon Chae, Sangseon Lee, Kenneth P Nephew, Sun Kim
BACKGROUND: Aberrant epigenetic modifications, including DNA methylation, are key regulators of gene activity in tumorigenesis. Breast cancer is a heterogeneous disease, and large-scale analyses indicate that tumor from normal and benign tissues, as well as molecular subtypes of breast cancer, can be distinguished based on their distinct genomic, transcriptomic, and epigenomic profiles. In this study, we used affinity-based methylation sequencing data in 30 breast cancer cell lines representing functionally distinct cancer subtypes to investigate methylation and mutation patterns at the whole genome level...
December 23, 2016: BMC Systems Biology
https://www.readbyqxmd.com/read/28154780/human-endogenous-retroviruses-and-cancer
#8
María Gonzalez-Cao, Paola Iduma, Niki Karachaliou, Mariacarmela Santarpia, Julià Blanco, Rafael Rosell
Human endogenous retroviruses (HERVs) are retroviruses that infected human genome millions of years ago and have persisted throughout human evolution. About 8% of our genome is composed of HERVs, most of which are nonfunctional because of epigenetic control or deactivating mutations. However, a correlation between HERVs and human cancer has been described and many tumors, such as melanoma, breast cancer, germ cell tumors, renal cancer or ovarian cancer, express HERV proteins, mainly HERV-K (HML6) and HERV-K (HML2)...
December 2016: Cancer Biology & Medicine
https://www.readbyqxmd.com/read/28151481/epigenetic-regulation-of-hgf-met-receptor-axis-is-critical-for-the-outgrowth-of-bone-metastasis-from-breast-carcinoma
#9
Paola Bendinelli, Paola Maroni, Emanuela Matteucci, Maria Alfonsina Desiderio
Our translational research deals with the influence of microenvironment on the phenotype and colonization of bone metastases from breast carcinoma, and on pre-metastatic niche formation. The aim of the present study was to clarify the origin of hepatocyte growth factor (HGF), ligand of Met receptor, the control of the axis HGF/Met by DNA methylation, and its importance for the nexus supportive cells-metastatic cells and for metastasis outgrowth. In bone metastasis of the 1833-xenograft model, DNA methyltransferase blockade using the chemotherapic drug 5-aza-2'-deoxycytidine (decitabine) strongly reduced the expression of HGF/Met receptor axis and of E-cadherin, with decrease of metastasis wideness and osteolysis, prolonging mice survival...
February 2, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28149335/cdh22-hypermethylation-is-an-independent-prognostic-biomarker-in-breast-cancer
#10
Esperanza Martín-Sánchez, Saioa Mendaza, Ane Ulazia-Garmendia, Iñaki Monreal-Santesteban, Alicia Córdoba, Francisco Vicente-García, Idoia Blanco-Luquin, Susana De La Cruz, Ana Aramendia, David Guerrero-Setas
BACKGROUND: Cadherin-like protein 22 (CDH22) is a transmembrane glycoprotein involved in cell-cell adhesion and metastasis. Its role in cancer is controversial because it has been described as being upregulated in colorectal cancer, whereas it is downregulated in metastatic melanoma. However, its status in breast cancer (BC) is unknown. The purpose of our study was to determine the molecular status and clinical value of CDH22 in BC. RESULTS: We observed by immunohistochemistry that the level of CDH22 expression was lower in BC tissues than in their matched adjacent-to-tumour and non-neoplastic tissues from reduction mammoplasties...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28137569/a-super-silac-strategy-for-the-accurate-and-multiplexed-profiling-of-histone-posttranslational-modifications
#11
R Noberini, T Bonaldi
Histone posttranslational modifications (hPTMs) generate a complex combinatorial code that plays a critical role in the regulation of gene activity and nuclear architecture during physiological and pathological processes. Mass spectrometry (MS) offers an unbiased, comprehensive, and quantitative view on hPTM patterns, and has emerged as a powerful tool in epigenetic research. Stable isotope labeling by amino acid in cell culture (SILAC) is a MS-based quantitative method that relies on the metabolic labeling of cell populations, which has been widely applied in global proteomic studies and can also be exploited for the accurate quantitation of hPTM changes among distinct functional states...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28137264/multiple-network-algorithm-for-epigenetic-modules-via-the-integration-of-genome-wide-dna-methylation-and-gene-expression-data
#12
Xiaoke Ma, Zaiyi Liu, Zhongyuan Zhang, Xiaotai Huang, Wanxin Tang
BACKGROUND: With the increase in the amount of DNA methylation and gene expression data, the epigenetic mechanisms of cancers can be extensively investigate. Available methods integrate the DNA methylation and gene expression data into a network by specifying the anti-correlation between them. However, the correlation between methylation and expression is usually unknown and difficult to determine. RESULTS: To address this issue, we present a novel multiple network framework for epigenetic modules, namely, Epigenetic Module based on Differential Networks (EMDN) algorithm, by simultaneously analyzing DNA methylation and gene expression data...
January 31, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28118602/a-methodological-study-of-genome-wide-dna-methylation-analyses-using-matched-archival-formalin-fixed-paraffin-embedded-and-fresh-frozen-breast-tumors
#13
Allyson C Espinal, Dan Wang, Li Yan, Song Liu, Li Tang, Qiang Hu, Carl D Morrison, Christine B Ambrosone, Michael J Higgins, Lara E Sucheston-Campbell
BACKGROUND: DNA from archival formalin-fixed and paraffin embedded (FFPE) tissue is an invaluable resource for genome-wide methylation studies although concerns about poor quality may limit its use. In this study, we compared DNA methylation profiles of breast tumors using DNA from fresh-frozen (FF) tissues and three types of matched FFPE samples. RESULTS: For 9/10 patients, correlation and unsupervised clustering analysis revealed that the FF and FFPE samples were consistently correlated with each other and clustered into distinct subgroups...
January 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/28115406/genetic-variants-in-epigenetic-pathways-and-risks-of-multiple-cancers-in-the-game-on-consortium
#14
Reka Toth, Dominique Scherer, Linda E Kelemen, Angela Risch, Aditi Hazra, Yesilda Balavarca, Jean-Pierre J Issa, Victor Moreno, Rosalind A Eeles, Shuji Ogino, Xifeng Wu, Yuanqing Ye, Rayjean J Hung, Ellen L Goode, Cornelia M Ulrich
BACKGROUND: Epigenetic disturbances are crucial in cancer initiation, potentially with pleiotropic effects, and may be influenced by the genetic background. METHODS: In a subsets (ASSET) meta-analytic approach, we investigated associations of genetic variants related to epigenetic mechanisms with risks of breast, lung, colorectal, ovarian and prostate carcinomas using 51,724 cases and 52,001 controls. False-discovery-rate corrected p-values (q-values < 0.05) were considered statistically significant...
January 23, 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28114909/low-glycemic-index-diet-exercise-and-vitamin-d-to-reduce-breast-cancer-recurrence-dedica-design-of-a-clinical-trial
#15
Livia S A Augustin, Massimo Libra, Anna Crispo, Maria Grimaldi, Michele De Laurentiis, Massimo Rinaldo, Massimiliano D'Aiuto, Francesca Catalano, Giuseppe Banna, Francesco Ferrau', Rosalba Rossello, Diego Serraino, Ettore Bidoli, Samuele Massarut, Guglielmo Thomas, Davide Gatti, Ernesta Cavalcanti, Monica Pinto, Gabriele Riccardi, Edward Vidgen, Cyril W C Kendall, David J A Jenkins, Gennaro Ciliberto, Maurizio Montella
BACKGROUND: Mechanisms influencing breast cancer (BC) development and recurrence include hyperglycemia, hyperinsulinemia, high insulin-like growth factor-1, high circulating estrogen, inflammation and impaired cellular differentiation/apoptosis. A lifestyle program that targets all the above mechanisms may be warranted. Low glycemic index (GI) foods produce lower post-prandial glucose and insulin responses and have been associated with lower BC risk. Moderate physical activity post-diagnosis reduces BC recurrence and mortality, partly explained by reduced insulin and estrogen levels...
January 23, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28114181/mthfr-gene-polymorphism-mutations-and-air-pollution-as-risk-factors-for-breast-cancer-a-metaprediction-study
#16
Mildred C Gonzales, Pojui Yu, S Pamela K Shiao
BACKGROUND: The methylenetetrahydrofolate reductase gene (MTHFR) is one of the most investigated genes associated with breast cancer for its role in epigenetic pathways. OBJECTIVES: The objectives of this metaprediction study were to examine the polymorphism-mutation risk subtypes of MTHFR and air pollution as contributing factors for breast cancer. METHODS: For triangulation purposes in metapredictive analyses, we used a recursive partition tree, nonlinear association curve fit, and heat maps for data visualization, in addition to the conventional comparison procedure and pooled analyses...
January 21, 2017: Nursing Research
https://www.readbyqxmd.com/read/28110749/contribution-of-syncytins-and-other-endogenous-retroviral-envelopes-to-human-placenta-pathologies
#17
P-A Bolze, M Mommert, F Mallet
Fusion, proliferation, angiogenesis, immune tolerance, and tissue survival are some of the critical functions involved in the physiological and pathological processes of placenta development. Strikingly, some of these properties are shared by envelope glycoproteins of retroviruses. Part of the overall retroviral world, the human retroviral heritage consists of hundred thousands of elements representing a huge amount of genetic material as compared to our 25,000 genes, whereas only a few tenths of retroviral loci still contain envelope genes exhibiting large open reading frames...
2017: Progress in Molecular Biology and Translational Science
https://www.readbyqxmd.com/read/28108626/a-new-role-for-er%C3%AE-silencing-via-dna-methylation-of-basal-stem-cell-and-emt-genes
#18
Eric A Ariazi, John C Taylor, Michael A Black, Emmanuelle Nicolas, Michael J Slifker, Diana J Azzam, Jeff Boyd
: Resistance to hormonal therapies is a major clinical problem in the treatment of estrogen receptor α-positive (ERα(+)) breast cancers. Epigenetic marks, namely DNA methylation of cytosine at specific CpG sites (5mCpG), are frequently associated with ERα(+) status in human breast cancers. Therefore, ERα may regulate gene expression in part via DNA methylation. This hypothesis was evaluated using a panel of breast cancer cell line models of antiestrogen resistance. Microarray gene expression profiling was used to identify genes normally silenced in ERα(+) cells but derepressed upon exposure to the demethylating agent decitabine, derepressed upon long-term loss of ERα expression, and resuppressed by gain of ERα activity/expression...
February 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28103111/oxidative-stress-and-carcinogenesis-potential-of-phytochemicals-in-breast-cancer-therapy
#19
Gilead Ebiegberi Forcados, Dorcas Bolanle James, Abdullahi Balarabe Sallau, Aliyu Muhammad, Peace Mabeta
Breast cancer remains a burden in both developed and developing countries, with higher mortality in developing countries. Attempts to eradicate cancer have not been successful despite the progress made in the development of more novel chemotherapeutic drugs. Reactive-oxygen-species-mediated oxidative stress is known to play a role in breast cancer pathogenesis via genetic and epigenetic modifications, resulting in uncontrolled cell proliferation. Phytochemicals could provide leads for the development of alternative therapeutic agents due to their antioxidant activity, as well as their ability to induce apoptosis in cancer cells...
January 19, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28101578/a-22q11-2-amplification-in-the-region-encoding-microrna-650-correlates-with-the-epithelial-to-mesenchymal-transition-in-breast-cancer-primary-cultures-of-mexican-patients
#20
M Lango-Chavarría, G K Chimal-Ramírez, M E Ruiz-Tachiquín, N A Espinoza-Sánchez, M C Suárez-Arriaga, E M Fuentes-Pananá
Breast cancer ranks first in incidence and mortality in working age women. Cancer initiation and progression relies on accumulation of genetic and epigenetic aberrations that alter cellular processes, among them, epithelial to mesenchymal transition (EMT) denotes particularly aggressive neoplasias given its capacity to invade and metastasize. Several microRNAs (miRNA) have been found able to regulate gene expression at the core of EMT. In this study, the Affymetrix CytoScan HD array was used to analyze three different primary tumor cell isolates from Mexican breast cancer patients...
February 2017: International Journal of Oncology
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