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https://www.readbyqxmd.com/read/28434943/epigenetic-pathways-in-human-disease-the-impact-of-dna-methylation-on-stress-related-pathogenesis-and-current-challenges-in-biomarker-development
#1
M Austin Argentieri, Sairaman Nagarajan, Bobak Seddighzadeh, Andrea A Baccarelli, Alexandra E Shields
HPA axis genes implicated in glucocorticoid regulation play an important role in regulating the physiological impact of social and environmental stress, and have become a focal point for investigating the role of glucocorticoid regulation in the etiology of disease. We conducted a systematic review to critically assess the full range of clinical associations that have been reported in relation to DNA methylation of CRH, CRH-R1/2, CRH-BP, AVP, POMC, ACTH, ACTH-R, NR3C1, FKBP5, and HSD11β1/2 genes in adults...
April 4, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28432260/dual-histone-reader-zmynd8-inhibits-cancer-cell-invasion-by-positively-regulating-epithelial-genes
#2
Moitri Basu, Isha Sengupta, Wasim Khan, Dushyant Kumar Srivastava, Partha Chakrabarti, Siddhartha Roy, Chandrima Das
Enhanced migratory potential and invasiveness of cancer cells attribute crucially.in cancer progression. These phenotypes are achieved by precise alteration of invasion-associated genes through local epigenetic modifications which are recognized by a class of proteins termed as chromatin reader. ZMYND8 (zinc finger MYND (Myeloid, Nervy and DEAF-1)-type containing 8), a key component of transcription regulatory network, has been recently shown to be a novel reader of H3.1K36Me2/H4K16Ac marks. Through differential gene expression analysis upon silencing this chromatin reader, we identified a subset of genes involved in cell proliferation and invasion/migration regulated by ZMYND8...
April 21, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28431263/epigenetic-therapy-and-chemosensitization-in-solid-malignancy
#3
REVIEW
Sean M Ronnekleiv-Kelly, Anup Sharma, Nita Ahuja
Epigenetic modifications result in dynamic shifts between transcriptionally active and suppressed states. The potentially reversible nature of epigenetic changes underlies the concept of epigenetic therapy, which serves to reprogram cancer cells as opposed to inducing cytotoxicity that occurs with standard chemotherapeutics. There are numerous enzymes involved in epigenetic changes and each can be potentially targetable. Although many investigations have evaluated the clinical potential of the various epigenetic therapies, currently only histone deacetylase inhibitors and DNA methyltransferase inhibitors are approved for use in specific hematologic malignancies...
April 8, 2017: Cancer Treatment Reviews
https://www.readbyqxmd.com/read/28424200/whole-exome-sequencing-of-metaplastic-breast-carcinoma-indicates-monoclonality-with-associated-ductal-carcinoma-component
#4
Bracha Avigdor, Katie Beierl, Christopher D Gocke, Daniel Zabransky, Karen Cravero, Kelly Kyker-Snowman, Berry Button, David Chu, Sarah Croessmann, Rory L Cochran, Roisin Connolly, Ben Ho Park, Ashley Cimino-Mathews, Sarah J Wheelan
Although most human cancers display a single histology, there are unusual cases where two or more distinct tissue types present within a primary tumor. One such example is metaplastic breast carcinoma, a rare but aggressive cancer with a heterogenous histology, including squamous, chondroid, and spindle cells. Metaplastic carcinomas often contain an admixed conventional ductal invasive or in situ mammary carcinoma component, and are typically triple-negative for estrogen receptor, progesterone receptor and human epidermal growth factor receptor 2 (HER-2) amplification/overexpression...
April 19, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28423572/acceleration-of-leukocytes-epigenetic-age-as-an-early-tumor-and-sex-specific-marker-of-breast-and-colorectal-cancer
#5
Danielle Fernandes Durso, Maria Giulia Bacalini, Claudia Sala, Chiara Pirazzini, Elena Marasco, Massimiliano Bonafé, Ítalo Faria do Valle, Davide Gentilini, Gastone Castellani, Ana Maria Caetano Faria, Claudio Franceschi, Paolo Garagnani, Christine Nardini
Changes in blood epigenetic age have been associated with several pathological conditions and have recently been described to anticipate cancer development. In this work, we analyze a publicly available leukocytes methylation dataset to evaluate the relation between DNA methylation age and the prospective development of specific types of cancer. We calculated DNA methylation age acceleration using five state-of-the-art estimators (three multi-site: Horvath, Hannum, Weidner; and two CpG specific: ELOV2 and FHL2) in a cohort including 845 subjects from the EPIC-Italy project and we compared 424 samples that remained cancer-free over the approximately ten years of follow-up with 235 and 166 subjects who developed breast and colorectal cancer, respectively...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423536/jmjd3-suppresses-stem-cell-like-characteristics-in-breast-cancer-cells-by-downregulation-of-oct4-independently-of-its-demethylase-activity
#6
Jing Xun, Dekun Wang, Long Shen, Junbo Gong, Ruifang Gao, Lingfang Du, Antao Chang, Xiangrong Song, Rong Xiang, Xiaoyue Tan
Epigenetic regulator JMJD3 plays an important role in both tumor progression and somatic cell reprogramming. Here, we explored the effect of JMJD3 on the stem cell-like characteristics of breast cancer and its underlying mechanism involving stemness-related transcription factor Oct4. Our data revealed that, in breast cancer cells lines and an orthotopic xenograph mouse model of breast cancer, ectopic overexpression of JMJD3 suppressed stem cell-like characteristics of breast cancer cells, whereas knockdown of JMJD3 promoted these characteristics...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423483/microrna-34a-targets-epithelial-to-mesenchymal-transition-inducing-transcription-factors-emt-tfs-and-inhibits-breast-cancer-cell-migration-and-invasion
#7
Saber Imani, Chunli Wei, Jingliang Cheng, Md Asaduzzaman Khan, Shangyi Fu, Luquan Yang, Mousumi Tania, Xianqin Zhang, Xiuli Xiao, Xianning Zhang, Junjiang Fu
MicroRNA-34a (miR-34a) plays an essential role against tumorigenesis and progression of cancer metastasis. Here, we analyzed the expression, targets and functional effects of miR-34a on epithelial to mesenchymal transition-inducing transcription factors (EMT-TFs), such as TWIST1, SLUG and ZEB1/2, and an EMT-inducing protein NOTCH1 in breast cancer (BC) cell migration and invasion and its correlation with tumorigenesis and clinical outcomes. Expression of miR-34a is downregulated in human metastatic breast cancers (MBC) compared to normal breast tissues and is negatively correlated with clinicopathological features of MBC patients...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423353/silencing-prdm14-expression-by-an-innovative-rnai-therapy-inhibits-stemness-tumorigenicity-and-metastasis-of-breast-cancer
#8
Hiroaki Taniguchi, Daisuke Hoshino, Chiharu Moriya, Hitoshi Zembutsu, Nobuhiro Nishiyama, Hiroyuki Yamamoto, Kazunori Kataoka, Kohzoh Imai
PR domain zinc finger protein 14 (PRDM14) maintains stemness in embryonic stem cells via epigenetic mechanisms. Although PRDM14 is elevated in several cancers, it is unclear if and how PRDM14 confers stem cell-like properties and epigenetic changes to cancer cells. Here, we examined the phenotypic characteristics and epigenetic and gene expression profiles of cancer cells that differentially express PRDM14, and assessed the potential of PRDM14-targeted cancer therapy. PRDM14 expression was markedly increased in many different cancer types and correlated with poor survival of breast cancer patients...
April 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28421159/mammalian-swi-snf-enzymes-and-the-epigenetics-of-tumor-cell-metabolic-reprogramming
#9
REVIEW
Jeffrey A Nickerson, Qiong Wu, Anthony N Imbalzano
Tumor cells reprogram their metabolism to survive and grow in a challenging microenvironment. Some of this reprogramming is performed by epigenetic mechanisms. Epigenetics is in turn affected by metabolism; chromatin modifying enzymes are dependent on substrates that are also key metabolic intermediates. We have shown that the chromatin remodeling enzyme Brahma-related gene 1 (BRG1), an epigenetic regulator, is necessary for rapid breast cancer cell proliferation. The mechanism for this requirement is the BRG1-dependent transcription of key lipogenic enzymes and regulators...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28415828/melatonin-for-the-prevention-and-treatment-of-cancer
#10
REVIEW
Ya Li, Sha Li, Yue Zhou, Xiao Meng, Jiao-Jiao Zhang, Dong-Ping Xu, Hua-Bin Li
The epidemiological studies have indicated a possible oncostatic property of melatonin on different types of tumors. Besides, experimental studies have documented that melatonin could exert growth inhibition on some human tumor cells in vitro and in animal models. The underlying mechanisms include antioxidant activity, modulation of melatonin receptors MT1 and MT2, stimulation of apoptosis, regulation of pro-survival signaling and tumor metabolism, inhibition on angiogenesis, metastasis, and induction of epigenetic alteration...
March 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415743/survival-differences-of-cimp-subtypes-integrated-with-cna-information-in-human-breast-cancer
#11
Huihan Wang, Weili Yan, Shumei Zhang, Yue Gu, Yihan Wang, Yanjun Wei, Hongbo Liu, Fang Wang, Qiong Wu, Yan Zhang
CpG island methylator phenotype of breast cancer is associated with widespread aberrant methylation at specified CpG islands and distinct patient outcomes. However, the influence of copy number contributing to the prognosis of tumors with different CpG island methylator phenotypes is still unclear. We analyzed both genetic (copy number) and epigenetic alterations in 765 breast cancers from The Cancer Genome Atlas data portal and got a panel of 15 biomarkers for copy number and methylation status evaluation...
March 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415616/z-ligustilide-restores-tamoxifen-sensitivity-of-era-negative-breast-cancer-cells-by-reversing-mta1-ifi16-hdacs-complex-mediated-epigenetic-repression-of-era
#12
Hui Ma, Li Li, Guojun Dou, Chengqiang Wang, Juan Li, Hui He, Mingxia Wu, Hongyi Qi
Emerging evidence indicates epigenetic modification represses estrogen receptor α (ERα) and contributes to the resistance to tamoxifen in aggressive ERα-negative (ERα-) breast cancer. Z-ligustilide is a major compound in Radix Angelica sinensis, an herb from traditional Chinese medicine (TCM) most frequently prescribed for breast cancer. However, the role of Z-ligustilide in ERα- breast cancer and epigenetic modification remains largely unknown. Herein we showed, for the first time, that Z-ligustilide restored the growth inhibition of tamoxifen on ERα- breast cancer cells...
March 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28412359/potentiation-of-docetaxel-sensitivity-by-mir-638-via-regulation-of-stard10-pathway-in-human-breast-cancer-cells
#13
Ge Zhao, Ying Li, Ting Wang
Acquired resistance to classical chemotherapeutics such as docetaxel (DTX) remains a critical challenge in breast cancer (BCa) treatment. Epigenetic modification by microRNAs (miRNAs) has been shown to play a crucial role in cancer drug resistance. Previous study, using human drug-resistant BCa tissues, has identified miR-638 as one of the most down-regulated miRNAs, but its exact roles and underlying mechanisms during the pathogenesis of chemoresistance remain to be determined. In the current study, we found that miR-638 expression was significantly down-regulated in clinical DTX-resistant BCa tissues compared to that in DTX-sensitive BCa tissues...
April 12, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28407579/plga-peg-nano-delivery-system-for-epigenetic-therapy
#14
Asia Naz, Yi Cui, Christopher J Collins, David H Thompson, Joseph Irudayaraj
Efficient delivery of cytidine analogues such as Azacitidine (AZA) into solid tumors constitutes a primary challenge in epigenetic therapies. We developed a di-block nano-vector based on poly(lactic-co-glycolic acid) (PLGA) and poly(ethylene glycol) (PEG) for stabilization of the conjugated AZA under physiological conditions. With equimolar drug content, our nano-conjugate could elicit a better anti-proliferative effect over free drug in breast cancer both in vitro and in vivo, through reactivation of p21 and BRCA1 to restrict cell proliferation...
April 10, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28404884/dfna5-promoter-methylation-a-marker-for-breast-tumorigenesis
#15
Lieselot Croes, Ken Op de Beeck, Patrick Pauwels, Wim Vanden Berghe, Marc Peeters, Erik Fransen, Guy Van Camp
BACKGROUND: Identification of methylation markers that are sensitive and specific for breast cancer may improve early detection. We hypothesize that DFNA5 promoter methylation can be a valuable epigenetic biomarker, based upon strong indications for its role as tumor suppressor gene and its function in regulated cell death. RESULTS: Statistically different levels of methylation were seen, with always very low levels in healthy breast reduction samples, very high levels in part of the adenocarcinoma samples and slightly increased levels in part of the normal tissue samples adjacent the tumor...
March 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28403857/hypermethylation-of-cdkn2a-exon-2-in-tumor-tumor-adjacent-and-tumor-distant-tissues-from-breast-cancer-patients
#16
Melanie Spitzwieser, Elisabeth Entfellner, Bettina Werner, Walter Pulverer, Georg Pfeiler, Stefan Hacker, Margit Cichna-Markl
BACKGROUND: Breast carcinogenesis is a multistep process involving genetic and epigenetic changes. Tumor tissues are frequently characterized by gene-specific hypermethylation and global DNA hypomethylation. Aberrant DNA methylation levels have, however, not only been found in tumors, but also in tumor-surrounding tissue appearing histologically normal. This phenomenon is called field cancerization. Knowledge of the existence of a cancer field and its spread are of clinical relevance...
April 12, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28396252/tea-phytochemicals-for-breast-cancer-prevention-and-intervention-from-bench-to-bedside-and-beyond
#17
REVIEW
Dona Sinha, Jaydip Biswas, Seyed Mohammad Nabavi, Anupam Bishayee
The National Cancer Institute of the United States had projected breast cancer as one of the topmost prevalent malignancies of 2016. It was estimated that in 2016, 246,660 new cases of invasive breast cancer were expected to be diagnosed in women in the US, along with 61,000 new cases of non-invasive (in situ) breast cancer. The heterogeneity of breast cancer accounts for its differential molecular subtyping. Recent incorporation of high throughput approaches helps early prognosis of breast cancer, but recurrence of the disease stands to be one of the most daunting fact behind non-availability of third line treatment...
April 7, 2017: Seminars in Cancer Biology
https://www.readbyqxmd.com/read/28395738/a-feeder-and-xeno-free-human-induced-pluripotent-stem-cell-line-obtained-from-primary-human-dermal-fibroblasts-with-epigenetic-repression-of-reprogramming-factors-expression-gpcci001-a
#18
Michał Stefan Lach, Joanna P Wroblewska, Ewelina Augustyniak, Katarzyna Kulcenty, Wiktoria Maria Suchorska
The primary human dermal fibroblasts (PHDFs) from breast cancer patient were obtained to generate the human induced pluripotent stem cell line GPCCi001-A via lentiviral transfection. Thus, a modified EF1a-hSTEMCCA-loxP with tetO operator which regulates transgene expression was used. This method takes advantage of epigenetic regulation of transcription and allows for stable silencing of the reprogramming factors in obtained hiPS cells. To increase the potential utility of hiPSCs for clinical applications, they were adapted to feeder- and xeno-free conditions...
April 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28382090/detection-of-methylated-circulating-dna-as-noninvasive-biomarkers-for-breast-cancer-diagnosis
#19
REVIEW
Isabella Wai Yin Cheuk, Vivian Yvonne Shin, Ava Kwong
Internationally, breast cancer is the most common female cancer, and is induced by a combination of environmental, genetic, and epigenetic risk factors. Despite the advancement of imaging techniques, invasive sampling of breast epithelial cells is the only definitive diagnostic procedure for patients with breast cancer. To date, molecular biomarkers with high sensitivity and specificity for the screening and early detection of breast cancer are lacking. Recent evidence suggests that the detection of methylated circulating cell-free DNA in the peripheral blood of patients with cancer may be a promising quantitative and noninvasive method for cancer diagnosis...
March 2017: Journal of Breast Cancer
https://www.readbyqxmd.com/read/28381188/elevated-expression-of-protein-arginine-methyltransferase-5-predicts-the-poor-prognosis-of-breast-cancer
#20
Ying Wu, Zhe Wang, Jian Zhang, Rui Ling
Protein arginine methyltransferase 5 is one of the type II protein arginine methyltransferase family members that can symmetrically dimethylate arginine residues on target proteins in both the cytoplasm and the nucleus. Protein arginine methyltransferase 5 was reported to be an oncoprotein that participates in tumor progression through both epigenetic silencing and organelle biogenesis. So far, it has been implicated in various cancers, but its expression pattern in breast cancer has not been elucidated thoroughly...
April 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
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