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breast cancer exosomes

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https://www.readbyqxmd.com/read/28076321/secretion-modification-region-derived-peptide-blocks-exosome-release-and-mediates-cell-cycle-arrest-in-breast-cancer-cells
#1
Ming-Bo Huang, Ruben R Gonzalez, James Lillard, Vincent C Bond
PURPOSE: Discovery and development of a novel anticancer PEG-SMR-Clu peptide to prevent breast cancer metastasis. How breast cancer cells and primary mammary epithelial cells interact and communicate with each other to promote tumorigenesis and how to prevent tumor metastasis has long been a concern of researchers. Cancer cells secrete exosomes containing proteins and RNA. These factors can influence tumor development by directly targeting cancer cells and tumor stroma. In this study, we determined the effects of a peptide as an inhibitor of exosome secretion on breast tumors...
January 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/28069806/dna-containing-exosomes-derived-from-cancer-cells-treated-with-topotecan-activate-a-sting-dependent-pathway-and-reinforce-antitumor-immunity
#2
Yuichi Kitai, Takumi Kawasaki, Takuya Sueyoshi, Kouji Kobiyama, Ken J Ishii, Jian Zou, Shizuo Akira, Tadashi Matsuda, Taro Kawai
Danger-associated molecular patterns derived from damaged or dying cells elicit inflammation and potentiate antitumor immune responses. In this article, we show that treatment of breast cancer cells with the antitumor agent topotecan (TPT), an inhibitor of topoisomerase I, induces danger-associated molecular pattern secretion that triggers dendritic cell (DC) activation and cytokine production. TPT administration inhibits tumor growth in tumor-bearing mice, which is accompanied by infiltration of activated DCs and CD8(+) T cells...
January 9, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28038441/visualization-of-exosome-mediated-mir-210-transfer-from-hypoxic-tumor-cells
#3
Kyung Oh Jung, Hyewon Youn, Chul-Hee Lee, Keon Wook Kang, June-Key Chung
Cancer cells actively release exosomes carrying specific cellular components, such as proteins, mRNA, and miRNA, to communicate with various cells in the tumor microenvironment. We visualized exosome-mediated transfer of miR-210 from hypoxic breast cancer cells to neighboring cells using a miR-210 specific reporter system. By in vitro and in vivo visualization, we found that exosomes with miR-210 were transferred to cells in the tumor microenvironment and that miR-210 was involved in expression of vascular remodeling related genes, such as Ephrin A3 and PTP1B, to promote angiogenesis...
December 27, 2016: Oncotarget
https://www.readbyqxmd.com/read/28032400/increasing-circulating-exosomes-carrying-trpc5-predicts-chemoresistance-in-metastatic-breast-cancer-patients
#4
Teng Wang, Kuan Ning, Ting-Xun Lu, Xu Sun, Linfang Jin, Xiaowei Qi, Jian Jin, Dong Hua
Chemoresistance, the major obstacle in breast cancer chemotherapy, results in unnecessary chemotherapy and wasting of medical resources. Up to now, no feasible method is available to predict chemoresistance before chemotherapy. In our previously study, elevated expression of transient receptor potential channel TRPC5 was found as an essential element for chemoresistance in breast cancer cells, and could be transferred to chemosensitive breast cancer cells through releasing extracellular vesicles (EVs)-containing TRPC5 from chemoresistant cells, resulting in acquired chemoresistance...
December 29, 2016: Cancer Science
https://www.readbyqxmd.com/read/27982016/exosomes-and-breast-cancer-a-comprehensive-review-of-novel-therapeutic-strategies-from-diagnosis-to-treatment
#5
REVIEW
C-Y Wu, S-L Du, J Zhang, A-L Liang, Y-J Liu
Exosomes are nanosized vesicles, released by various cells, which have essential roles in intercellular communication locally and systemically through transporting their contents such as proteins and lipids as well as RNA. It was clear that the element of contents in exosomes reassembled with the emerging of cancers. Over the past decade, researchers paid more attention to the role of exosomes in breast cancer. The purpose of this review was to discuss the details of the biological characteristics of exosomes in breast cancer...
December 16, 2016: Cancer Gene Therapy
https://www.readbyqxmd.com/read/27965916/in-vivo-flow-cytometry-of-circulating-tumor-associated-exosomes
#6
Jacqueline Nolan, Mustafa Sarimollaoglu, Dmitry A Nedosekin, Azemat Jamshidi-Parsian, Ekaterina I Galanzha, Rajshekhar A Kore, Robert J Griffin, Vladimir P Zharov
Circulating tumor cells (CTCs) demonstrated the potential as prognostic markers of metastatic development. However, the incurable metastasis can already be developed at the time of initial diagnosis with the existing CTC assays. Alternatively, tumor-associated particles (CTPs) including exosomes can be a more valuable prognostic marker because they can be released from the primary tumor long before CTCs and in larger amount. However, little progress has been made in high sensitivity detection of CTPs, especially in vivo...
2016: Analytical Cellular Pathology (Amsterdam)
https://www.readbyqxmd.com/read/27959588/exosome-mediated-telomere-instability-in-human-breast-epithelial-cancer-cells-after-x-irradiation
#7
Ammar H J Al-Mayah, Scott J Bright, Debbie A Bowler, Predrag Slijepcevic, Edwin Goodwin, Munira A Kadhim
In directly irradiating cells, telomere metabolism is altered and similar effects have been observed in nontargeted cells. Exosomes and their cargo play dominant roles in communicating radiation-induced bystander effects with end points related to DNA damage. Here we report novel evidence that exosomes are also responsible for inducing telomere-related bystander effects. Breast epithelial cancer cells were exposed to either 2 Gy X rays, or exposed to irradiated cell conditioned media (ICCM), or exosomes purified from ICCM...
December 13, 2016: Radiation Research
https://www.readbyqxmd.com/read/27941677/the-enrichment-of-survivin-in-exosomes-from-breast-cancer-cells-treated-with-paclitaxel-promotes-cell-survival-and-chemoresistance
#8
Bridget T Kreger, Eric R Johansen, Richard A Cerione, Marc A Antonyak
The generation and release of membrane-enclosed packets from cancer cells, called extracellular vesicles (EVs), play important roles in propagating transformed phenotypes, including promoting cell survival. EVs mediate their effects by transferring their contents, which include specific proteins and nucleic acids, to target cells. However, how the cargo and function of EVs change in response to different stimuli remains unclear. Here, we discovered that treating highly aggressive MDAMB231 breast cancer cells with paclitaxel (PTX), a chemotherapy that stabilizes microtubules, causes them to generate a specific class of EV, namely exosomes, that are highly enriched with the cell survival protein and cancer marker, Survivin...
December 9, 2016: Cancers
https://www.readbyqxmd.com/read/27917441/size-selective-harvesting-of-extracellular-vesicles-for-strategic-analyses-towards-tumor-diagnoses
#9
Chihiro Manri, Takahide Yokoi, Hirokazu Nishida
Extracellular vesicles (EV), typified by exosomes or microvesicles, are expected to be effective diagnostic markers for cancers. The sizes of the vesicles range from 20 to 1000 nm, but the size-dependent variations of the contents of EVs are still poorly understood. We succeeded in the size-selective harvesting of the vesicles by utilizing the molecular weight-dependent characteristics of a variety of polyethylene glycols (PEG) as precipitating reagents and analyzed the antigens displayed on the surfaces of the vesicles and the miRNAs included in the vesicles from each size group...
December 5, 2016: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/27906043/exosomes-play-an-important-role-in-the-process-of-psoralen-reverse-multidrug-resistance-of-breast-cancer
#10
Xiaohong Wang, Chengfeng Xu, Yitong Hua, Leitao Sun, Kai Cheng, Zhongming Jia, Yong Han, Jianli Dong, Yuzhen Cui, Zhenlin Yang
BACKGROUND: Release of exosomes have been shown to play critical roles in drug resistance by delivering cargo. Targeting the transfer of exosomes from resistant cells to sensitive cells may be an approach to overcome some cases of drug resistance. METHOD: In this study, we investigated the potential role of exosomes in the process of psoralen reverse multidrug resistance of MCF-7/ADR cells. Exosomes were isolated by differential centrifugation of culture media from MCF-7/ADR cells (ADR/exo) and MCF-7 parental cells (S/exo)...
December 1, 2016: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/27897190/versatile-sensitive-liquid-chromatography-mass-spectrometry-implementation-of-10%C3%A2-%C3%AE-m-ot-columns-suitable-for-small-molecules-peptides-and-proteins
#11
T Vehus, H Roberg-Larsen, J Waaler, S Aslaksen, S Krauss, S R Wilson, E Lundanes
We have designed a versatile and sensitive liquid chromatographic (LC) system, featuring a monolithic trap column and a very narrow (10 μm ID) fused silica open tubular liquid chromatography (OTLC) separation column functionalized with C18-groups, for separating a wide range of molecules (from small metabolites to intact proteins). Compared to today's capillary/nanoLC approaches, our system provides significantly enhanced sensitivity (up to several orders) with matching or improved separation efficiency, and highly repeatable chromatographic performance...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27858503/high-throughput-sequencing-of-two-populations-of-extracellular-vesicles-provides-an-mrna-signature-that-can-be-detected-in-the-circulation-of-breast-cancer-patients
#12
Andrew Conley, Valentina R Minciacchi, Dhong Hyun Lee, Beatrice S Knudsen, Beth Y Karlan, Luigi Citrigno, Giuseppe Viglietto, Muneesh Tewari, Michael R Freeman, Francesca Demichelis, Dolores Di Vizio
Extracellular vesicles (EVs) contain a wide range of RNA types with a reported prevalence of non-coding RNA. To date a comprehensive characterization of the protein coding transcripts in EVs is still lacking. We performed RNA-Sequencing (RNA-Seq) of two EV populations and identified a small fraction of transcripts that were expressed at significantly different levels in large oncosomes and exosomes, suggesting they may mediate specialized functions. However, these two EV populations exhibited a common mRNA signature that, in comparison to their donor cells, was significantly enriched in mRNAs encoding E2F transcriptional targets and histone proteins...
November 18, 2016: RNA Biology
https://www.readbyqxmd.com/read/27845903/myoferlin-is-a-novel-exosomal-protein-and-functional-regulator-of-cancer-derived-exosomes
#13
Arnaud Blomme, Karim Fahmy, Olivier Peulen, Brunella Costanza, Marie Fontaine, Ingrid Struman, Dominique Baiwir, Edwin de Pauw, Marc Thiry, Akeila Bellahcène, Vincent Castronovo, Andrei Turtoi
Exosomes are communication mediators participating in the intercellular exchange of proteins, metabolites and nucleic acids. Recent studies have demonstrated that exosomes are characterized by a unique proteomic composition that is distinct from the cellular one. The mechanisms responsible for determining the proteome content of the exosomes remain however obscure. In the current study we employ ultrastructural approach to validate a novel exosomal protein myoferlin. This is a multiple C2-domain containing protein, known for its conserved physiological function in endocytosis and vesicle fusion biology...
November 10, 2016: Oncotarget
https://www.readbyqxmd.com/read/27832183/tumor-cell-derived-exosomes-from-the-prostate-cancer-cell-line-tramp-c1-impair-osteoclast-formation-and-differentiation
#14
Terese Karlsson, Marie Lundholm, Anders Widmark, Emma Persson
Skeletal metastatic disease is a deleterious consequence of dissemination of tumor cells from numerous primary sites, such as prostate, lung and breast. Skeletal metastases are still incurable, resulting in development of clinical complications and decreased survival for cancer patients with metastatic disease. During the last decade, tumor cell-derived microvesicles have been identified and suggested to be involved in cancer disease progression. Whether cancer exosomes are involved in tumor and bone cell interactions in the metastatic site is still, however, a rather unexplored field...
2016: PloS One
https://www.readbyqxmd.com/read/27831634/exosomes-mediated-transfer-of-lncrna-uca1-results-in-increased-tamoxifen-resistance-in-breast-cancer-cells
#15
C-G Xu, M-F Yang, Y-Q Ren, C-H Wu, L-Q Wang
OBJECTIVE: In this study, we firstly compared the loading of urothelial carcinoma-associated 1 (UCA1) in exosomes between tamoxifen sensitive and tamoxifen resistant breast cancer cells and further investigated the role of exosomal transfer of UCA1 in the development of tamoxifen resistance in estrogen receptor (ER) positive breast cancer cells. MATERIALS AND METHODS: Exosomes were isolated from the culture medium of tamoxifen sensitive MCF-7 cells and tamoxifen resistant LCC2 cells...
October 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27822407/exosomes-mediate-micrornas-transfer-in-breast-cancer-chemoresistance-regulation
#16
REVIEW
Juliana Carvalho Santos, Marcelo Lima Ribeiro, Luis Otávio Sarian, Manoela Marques Ortega, Sophie Françoise Derchain
Breast cancer is the most common and fatal type of cancer in women worldwide due to the metastatic process and resistance to treatment. Despite advances in molecular knowledge, little is known regarding resistance to chemotherapy. One highlighted aspect is the DNA damage response (DDR) pathway that is activated upon genotoxic damage, controlling the cell cycle arrest or DNA repair activation. Recently, studies have showed that cancer stem cells (CSCs) could promote chemoresistance through DDR pathway. Furthermore, it is known that the epithelial-mesenchymal transition (EMT) can generate cells with CSCs characteristics and therefore regulate the chemoresistance process...
2016: American Journal of Cancer Research
https://www.readbyqxmd.com/read/27819324/a-rapid-automated-surface-protein-profiling-of-single-circulating-exosomes-in-human-blood
#17
Golam Kibria, Erika K Ramos, Katelyn E Lee, Sarah Bedoyan, Simo Huang, Ravand Samaeekia, Jaffre J Athman, Clifford V Harding, Jan Lötvall, Lyndsay Harris, Cheryl L Thompson, Huiping Liu
Circulating exosomes provide a promising approach to assess novel and dynamic biomarkers in human disease, due to their stability, accessibility and representation of molecules from source cells. However, this potential has been stymied by lack of approaches for molecular profiling of individual exosomes, which have a diameter of 30-150 nm. Here we report a rapid analysis approach to evaluate heterogeneous surface protein expression in single circulating exosomes from human blood. Our studies show a differential CD47 expression in blood-derived individual circulating exosomes that is correlated with breast cancer status, demonstrating a great potential of individual exosome profiles in biomarker discovery...
November 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27800035/oncogene-knockdown-via-active-loading-of-small-rnas-into-extracellular-vesicles-by-sonication
#18
Tek N Lamichhane, Anjana Jeyaram, Divya B Patel, Babita Parajuli, Natalie K Livingston, Navein Arumugasaamy, John S Schardt, Steven M Jay
Extracellular vesicles (EVs), including exosomes and microvesicles, have emerged as promising drug delivery vehicles for small RNAs (siRNA and miRNA) due to their natural role in intercellular RNA transport. However, the application of EVs for therapeutic RNA delivery may be limited by loading approaches that can induce cargo aggregation or degradation. Here, we report the use of sonication as a means to actively load functional small RNAs into EVs. Conditions under which EVs could be loaded with small RNAs with minimal detectable aggregation were identified, and EVs loaded with therapeutic siRNA via sonication were observed to be taken up by recipient cells and capable of target mRNA knockdown leading to reduced protein expression...
September 2016: Cellular and Molecular Bioengineering
https://www.readbyqxmd.com/read/27760843/exosomal-annexin-ii-promotes-angiogenesis-and-breast-cancer-metastasis
#19
Sayantan Maji, Pankaj Chaudhary, Irina Akopova, Phung M Nguyen, Richard J Hare, Ignacy Gryczynski, Jamboor K Vishwanatha
: Tumor-derived exosomes are emerging mediators of tumorigenesis and tissue-specific metastasis. Proteomic profiling has identified Annexin II as one of the most highly expressed proteins in exosomes; however, studies focused on the biological role of exosomal Annexin II (exo-Anx II) are still lacking. In this study, mechanistic insight was sought regarding exo-Anx II and its function in angiogenesis and breast cancer metastasis. Multiple in vitro and in vivo techniques were used to study the role of exo-Anx II in angiogenesis...
January 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/27760789/the-biodistribution-and-immune-suppressive-effects-of-breast-cancer-derived-exosomes
#20
Shu Wen Wen, Jaclyn Sceneay, Luize Goncalves Lima, Christina S F Wong, Melanie Becker, Sophie Krumeich, Richard J Lobb, Vanessa Castillo, Ke Ni Wong, Sarah Ellis, Belinda S Parker, Andreas Möller
Small membranous secretions from tumor cells, termed exosomes, contribute significantly to intercellular communication and subsequent reprogramming of the tumor microenvironment. Here, we use optical imaging to determine that exogenously administered fluorescently labeled exosomes derived from highly metastatic murine breast cancer cells distributed predominantly to the lung of syngeneic mice, a frequent site of breast cancer metastasis. At the sites of accumulation, exosomes were taken up by CD45(+) bone marrow-derived cells...
December 1, 2016: Cancer Research
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