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breast cancer exosomes

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https://www.readbyqxmd.com/read/28797930/%C3%AE-tocotrienol-induced-disruption-of-lipid-rafts-in-human-breast-cancer-cells-is-associated-with-a-reduction-in-exosome-heregulin-content
#1
Osama A Alawin, Rayan A Ahmed, Venkateshwararao Dronamraju, Karen P Briski, Paul W Sylvester
Overexpression of heregulin, a potent ligand that activates HER3 and HER4 receptors, plays a significant role in the development of chemotherapy resistance in breast cancer patients. Exosomes released from cancer cells are small vesicles originating from the outward budding of lipid rafts that carry various mitogenic proteins that then act locally in an autocrine/paracrine manner to stimulate cancer cell growth. Since the anticancer activity of γ-tocotrienol has been shown to be mediated in part through the disruption of lipid rafts, studies were conducted to determine the effect of γ-tocotrienol on exosomes mitogenic biopotency...
July 10, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28744322/visualization-of-tumor-immune-interaction-target-specific-imaging-of-s100a8-a9-reveals-pre-metastatic-niche-establishment
#2
Michel Eisenblaetter, Fabian Flores-Borja, Jae Jin Lee, Christina Wefers, Hannah Smith, Rebekka Hueting, Margaret S Cooper, Philip J Blower, Dominic Patel, Manuel Rodriguez-Justo, Hanna Milewicz, Thomas Vogl, Johannes Roth, Andrew Tutt, Tobias Schaeffter, Tony Ng
Background Systemic cancer spread is preceded by the establishment of a permissive microenvironment in the target tissue of metastasis - the premetastatic niche. As crucial players in establishment of the pre-metastatic niche, myeloid derived suppressor cells (MDSC) release S100A8/A9, an exosomal protein that contributes to metastasis, angiogenesis, and immune suppression. We report the application of antibody-based single-photon emission computed tomography (SPECT) for detection of S100A8/A9 in vivo as an imaging marker for pre-metastatic tissue priming...
2017: Theranostics
https://www.readbyqxmd.com/read/28743887/tumor-derived-exosomes-induce-the-formation-of-neutrophil-extracellular-traps-implications-for-the-establishment-of-cancer-associated-thrombosis
#3
Ana C Leal, Daniella M Mizurini, Tainá Gomes, Natalia C Rochael, Elvira M Saraiva, Marcos S Dias, Claudio C Werneck, Micheli S Sielski, Cristina P Vicente, Robson Q Monteiro
Cancer patients are at an increased risk of developing thromboembolic complications. Several mechanisms have been proposed to explain cancer-associated thrombosis including the release of tumor-derived extracellular vesicles and the activation of host vascular cells. It was proposed that neutrophil extracellular traps (NETs) contribute to the prothrombotic phenotype in cancer. In this study, we evaluated the possible cooperation between tumor-derived exosomes and NETs in cancer-associated thrombosis. Female BALB/c mice were orthotopically injected with 4T1 breast cancer cells...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28741069/microrna-100-shuttled-by-mesenchymal-stem-cell-derived-exosomes-suppresses-in-vitro-angiogenesis-through-modulating-the-mtor-hif-1%C3%AE-vegf-signaling-axis-in-breast-cancer-cells
#4
Katayoon Pakravan, Sadegh Babashah, Majid Sadeghizadeh, Seyed Javad Mowla, Majid Mossahebi-Mohammadi, Farangis Ataei, Nasim Dana, Mohammad Javan
BACKGROUND: Human mesenchymal stem cells (MSCs) have been shown to be involved in the formation and modulation of tumor stroma and in interacting with tumor cells, partly through their secretome. Exosomes are nano-sized intraluminal multi-vesicular bodies secreted by most types of cells and have been found to mediate intercellular communication through the transfer of genetic information via coding and non-coding RNAs to recipient cells. Since exosomes are considered as protective and enriched sources of shuttle microRNAs (miRNAs), we hypothesized that exosomal transfer of miRNAs from MSCs may affect tumor cell behavior, particularly angiogenesis...
July 24, 2017: Cellular Oncology (Dordrecht)
https://www.readbyqxmd.com/read/28709002/exosome-rna-unshielding-couples-stromal-activation-to-pattern-recognition-receptor-signaling-in-cancer
#5
Barzin Y Nabet, Yu Qiu, Jacob E Shabason, Tony J Wu, Taewon Yoon, Brian C Kim, Joseph L Benci, Angela M DeMichele, Julia Tchou, Joseph Marcotrigiano, Andy J Minn
Interactions between stromal fibroblasts and cancer cells generate signals for cancer progression, therapy resistance, and inflammatory responses. Although endogenous RNAs acting as damage-associated molecular patterns (DAMPs) for pattern recognition receptors (PRRs) may represent one such signal, these RNAs must remain unrecognized under non-pathological conditions. We show that triggering of stromal NOTCH-MYC by breast cancer cells results in a POL3-driven increase in RN7SL1, an endogenous RNA normally shielded by RNA binding proteins SRP9/14...
July 13, 2017: Cell
https://www.readbyqxmd.com/read/28706483/phytoagent-deoxyelephantopin-and-its-derivative-inhibit-triple-negative-breast-cancer-cell-activity-through-ros-mediated-exosomal-activity-and-protein-functions
#6
Jeng-Yuan Shiau, Yong-Qun Chang, Kyoko Nakagawa-Goto, Kuo-Hsiung Lee, Lie-Fen Shyur
A novel plant sesquiterpene lactone derivative, DET derivative (DETD)-35, originating from parental deoxyelephantopin (DET) was previously observed to effectively suppress human triple negative breast cancer (TNBC) MDA-MB-231 cell activity and tumor growth in mice. In this study, the mechanisms underlying the activity of DETD-35 were elucidated. DET and DETD-35 induced reactive oxygen species (ROS) which caused structural damage and dysfunction of mitochondria and increased cytosolic calcium level, subsequently evoking exosome release from the cancer cells...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28694015/predicting-treatment-resistance-and-relapse-through-circulating-dna
#7
Emma Beddowes, Stephen J Sammut, Meiling Gao, Carlos Caldas
The use of circulating DNA(ctDNA) to provide a non-invasive, personalised genomic snapshot of a patients' tumour has huge potential. Over the past five years this area of research has gained huge momentum. A number of studies in metastatic breast cancer have shown the potential of ctDNA to predict prognosis and treatment response using ctDNA. Further developments have included deeper sequencing using whole exome and shallow whole genome approaches which has the potential to identify new mutations and chromosomal copy number changes which appear upon resistance to treatment...
July 8, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28692055/cellular-prion-protein-prp-c-in-the-development-of-merlin-deficient-tumours
#8
L Provenzano, Y Ryan, D A Hilton, J Lyons-Rimmer, F Dave, E A Maze, C L Adams, R Rigby-Jones, S Ammoun, C O Hanemann
Loss of function mutations in the neurofibromatosis Type 2 (NF2) gene, coding for a tumour suppressor, Merlin, cause multiple tumours of the nervous system such as schwannomas, meningiomas and ependymomas. These tumours may occur sporadically or as part of the hereditary condition neurofibromatosis Type 2 (NF2). Current treatment is confined to (radio) surgery and no targeted drug therapies exist. NF2 mutations and/or Merlin inactivation are also seen in other cancers including some mesothelioma, breast cancer, colorectal carcinoma, melanoma and glioblastoma...
July 10, 2017: Oncogene
https://www.readbyqxmd.com/read/28687020/chemotherapy-administration-to-breast-cancer-patients-affects-extracellular-vesicles-thrombogenicity-and-function
#9
Anat Aharon, Anni Sabbah, Shahar Ben-Shaul, Hila Berkovich, David Loven, Benjamin Brenner, Gil Bar-Sela
Breast cancer (BC) is the most prevalent type of malignancy in women. Extracellular vesicles (EVs) are subcellular membrane blebs that include exosomes and microparticles. STUDY AIMS: To elucidate the effects of chemotherapy administration on BC patients' EVs characteristics and their effects on endothelial cells (EC) functions. METHODS: EVs were isolated from the blood samples of 54 BC patients treated by chemotherapy (25 neo-adjuvant, 29 adjuvant) and from 20 healthy women (control group)...
June 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28683441/clinical-relevance-of-circulating-cell-free-and-exosomal-micrornas-in-plasma-and-serum-of-breast-cancer-patients
#10
Heidi Schwarzenbach
The expression of microRNAs (miRNAs) in a tissue- and development-specific manner has indicated that they play an essential role in the maintenance of biological homeostasis. In cancer, the deregulation of these small non-coding RNA molecules modulates the expression of numerous tumor-associated genes and cellular processes. The high levels of cancer-associated sensitivity and specificity of plasma/serum and exosomal miRNA profiles reflect disease development, tumor load, malignant progression towards metastatic relapse and drug resistance...
2017: Oncology Research and Treatment
https://www.readbyqxmd.com/read/28672799/exosomal-micrornas-in-breast-cancer-towards-diagnostic-and-therapeutic-applications
#11
REVIEW
Lorenzo F Sempere, Jessica Keto, Muller Fabbri
Soon after the discovery of microRNAs over 15 years ago, a myriad of research groups around the world sought to develop clinical applications in breast cancer for these short, noncoding, regulatory RNAs. While little of this knowledge has translated into the clinic, the recent research explosion on cell-to-cell communication via exosomes and other extracellular vesicles has rekindled interest in microRNA-based clinical applications. microRNAs appear to be a preferential and important cargo of exosomes in mediating biological effects in recipient cells...
June 24, 2017: Cancers
https://www.readbyqxmd.com/read/28643865/characterization-and-biological-function-of-milk-derived-mirnas
#12
Regina Golan-Gerstl, Yaffa Elbaum Shiff, Vardit Lavi-Moshayoff, Daniel Schecter Dena Leshkowitz, Shimon Reif
SCOPE: Breastfeeding is associated with reduced risk of infection, immune mediated disorders, obesity and even cancer. Recently it was found that breast milk contains a variety of microRNAs (miRNAs) in the skim and fat layer that can be transferred to infants, and appear to play important roles in those biological functions. METHODS AND RESULTS: This study applied Next Generation Sequencing and quantitative real time PCR analysis to determine the miRNA expression profile of the skim and fat fraction of human, goat, and bovine milk as well as infant formulas...
June 23, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28641308/detection-of-phosphatidylserine-positive-exosomes-for-the-diagnosis-of-early-stage-malignancies
#13
Raghava Sharma, Xianming Huang, Rolf A Brekken, Alan J Schroit
BACKGROUND: There has been increasing interest in the detection of tumour exosomes in blood for cancer diagnostics. Most studies have focussed on miRNA and protein signatures that are surrogate markers for specific tumour types. Because tumour cells and tumour-derived exosomes display phosphatidylserine (PS) in their outer membrane leaflet, we developed a highly sensitive ELISA-based system that detects picogram amounts of exosomal phospholipid in plasma as a cancer biomarker. METHODS: This report describes the development of a highly specific and sensitive ELISA for the capture of PS-expressing tumour exosomes in the blood of tumour-bearing mice...
August 8, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28600504/amphiregulin-contained-in-nsclc-exosomes-induces-osteoclast-differentiation-through-the-activation-of-egfr-pathway
#14
Simona Taverna, Marzia Pucci, Marco Giallombardo, Maria Antonietta Di Bella, Mariacarmela Santarpia, Pablo Reclusa, Ignacio Gil-Bazo, Christian Rolfo, Riccardo Alessandro
Non-small cell lung cancer (NSCLC) remains the leading cause of cancer-related deaths worldwide. The majority of patients are diagnosed in advanced disease stage. Bone metastasis is the most frequent complication in NSCLC resulting in osteolytic lesions. The perfect balance between bone-resorbing osteoclasts and bone-forming osteoblasts activity is lost in bone metastasis, inducing osteoclastogenesis. In NSCLC, the epidermal growth factor receptor (EGFR) pathway is constitutively activated. EGFR binds Amphiregulin (AREG) that is overexpressed in several cancers such as colon, breast and lung...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28574818/characterization-of-the-release-and-biological-significance-of-cell-free-dna-from-breast-cancer-cell-lines
#15
Wei Wang, Peng Kong, Ge Ma, Li Li, Jin Zhu, Tiansong Xia, Hui Xie, Wenbin Zhou, Shui Wang
In breast cancer, cell-free DNA (cfDNA) has been proven to be a diagnostic and prognostic biomarker. However, there have been few studies on the origin and biological significance of cfDNA. In this study, we assessed the release pattern of cfDNA from breast cancer cell lines under different culture conditions and investigated the biological significance of cfDNA. The cfDNA concentration increased rapidly (6 h) after passage, decreased gradually, and was then maintained at a relatively stable level after 24 h...
June 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/28562349/microrna-155-induced-by-foxp3-through-transcriptional-repression-of-brca1-is-associated-with-tumor-initiation-in-human-breast-cancer
#16
Song Gao, Yicun Wang, Meng Wang, Zhi Li, Zhiying Zhao, Raymond X Wang, Rong Wu, Zhengwei Yuan, Ranji Cui, Kai Jiao, Lizhong Wang, Ling Ouyang, Runhua Liu
MicroRNA (miR)-155 is upregulated in breast cancer cells and in sera of patients with breast cancer, but its clinical relevance remains uncertain. The objective of the present effort was to address the transcriptional regulation of miR-155. A bioinformatics analysis of public datasets validated upregulation of miR-155 in tumor cells of patients with breast cancer, particularly those who were at early stages and had triple-negative cancers. The expression profiling and clinical relevance of miR-155 in tumor cells and blood cells were characterized by TaqMan miR assays and, in plasma and exosomes, by nest-quantitative PCR analysis...
June 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28536329/-multilateral-strategies-utilizing-exosomes-for-cancer-therapy
#17
Nao Nishida-Aoki, Takahiro Ochiya
Exosomes are nano-sized extracellular vesicles which transfer their components such as RNA, DNA, and proteins from one cell to another cell. The components are released to the cytoplasm of the recipient cells, having an effect on the cells. Cancerderived exosomes promote cancer progression, invasion, gain of drug resistance, and metastasis. Recently, according to their characteristics, it is expected to apply exosomes to cancer therapies, such as utilizing exosomes as drug delivery systems(DDS) for anticancer drugs and as cancer vaccines to enhance immunity to cancer cells...
May 2017: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28534915/quantum-dot-based-sensitive-detection-of-disease-specific-exosome-in-serum
#18
Kseniia Boriachek, Md Nazmul Islam, Vinod Gopalan, Alfred K Lam, Nam-Trung Nguyen, Muhammad J A Shiddiky
Tumor-derived exosomes have emerged as promising cancer biomarkers due to their unique composition and functions. Herein, we report a stripping voltammetric immunoassay for the electrochemical detection of disease-specific exosomes using quantum dots as signal amplifiers. The assay involves three subsequent steps where bulk exosome populations are initially magnetically captured on magnetic beads by a generic tetraspanin antibody (e.g., CD9 or CD63) followed by the identification of disease-specific exosomes using cancer-related...
June 21, 2017: Analyst
https://www.readbyqxmd.com/read/28486412/chloramidine-bisindolylmaleimide-i-mediated-inhibition-of-exosome-and-microvesicle-release-and-enhanced-efficacy-of-cancer-chemotherapy
#19
Uchini S Kosgodage, Rita P Trindade, Paul R Thompson, Jameel M Inal, Sigrun Lange
Microvesicle (MV) release from tumour cells influences drug retention, contributing to cancer drug resistance. Strategically regulating MV release may increase drug retention within cancer cells and allow for lower doses of chemotherapeutic drugs. The contribution of exosomes to drug retention still remains unknown. Potential exosome and MV (EMV) biogenesis inhibitors, tested on human prostate cancer (PC3) cells for their capacity to inhibit EMV release, were also tested on PC3 and MCF-7 (breast cancer) cells for improving chemotherapy...
May 9, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28451400/accumulation-of-gas5-in-exosomes-is-a-marker-of-apoptosis-induction
#20
Oguz Koldemir, Emre Özgür, Ugur Gezer
Long non-coding RNAs (lncRNAs) are key regulatory molecules in many fundamental cellular processes and their deregulation is assumed to contribute to carcinogenesis. Exosomal lncRNAs are thought to be involved in the dissemination of cell signals to control local cellular microenvironments. In the current study, exosomal expression of growth arrest specific 5 (GAS5), an inhibitor of cell proliferation and promoter of apoptosis, was evaluated in apoptotic processes initiated by different mechanisms. Therefore, MCF-7 and MDA-MB-231 breast cancer cells were treated with Taxol (2 and 10 nM) and bleomycin (2 and 10 ng/ml) for 24 h...
March 2017: Biomedical Reports
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