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Tumor dormancy

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https://www.readbyqxmd.com/read/28599500/notable-roles-of-ezh2-and-dnmt1-in-epigenetic-dormancy-of-the-shp1-gene-during-the-progression-of-chronic-myeloid-leukaemia
#1
Jing Wang, Luoming Hua, Ming Guo, Lin Yang, Xiaojun Liu, Yanmeng Li, Xiaoyan Shang, Jianmin Luo
Tumor development is associated with the methylation of cytosine-guanine (CpG) islands. The occurrence of methylation requires several factors, such as DNA methylation systems and polycomb group (PcG) proteins. At present, novel drugs are needed for the treatment of chronic myeloid leukaemia (CML), particularly considering the current prognosis of CML. The methylation status of the Src homology 2 domain-containing tyrosine phosphatase 1 (SHP1) gene, a negative regulator of signal transduction, has been identified as being altered in numerous haematological malignancies...
June 2017: Oncology Letters
https://www.readbyqxmd.com/read/28585066/modeling-the-dichotomy-of-the-immune-response-to-cancer-cytotoxic-effects-and-tumor-promoting-inflammation
#2
Kathleen P Wilkie, Philip Hahnfeldt
Although the immune response is often regarded as acting to suppress tumor growth, it is now clear that it can be both stimulatory and inhibitory. The interplay between these competing influences has complex implications for tumor development, cancer dormancy, and immunotherapies. In fact, early immunotherapy failures were partly due to a lack in understanding of the nonlinear growth dynamics these competing immune actions may cause. To study this biological phenomenon theoretically, we construct a minimally parameterized framework that incorporates all aspects of the immune response...
June 5, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28516343/therapeutic-dormancy-to-delay-postsurgical-glioma-recurrence-the-past-present-and-promise-of-focal-hypothermia
#3
REVIEW
Didier Wion
Surgery precedes both radiotherapy and chemotherapy as the first-line therapy for glioma. However, despite multimodal treatment, most glioma patients die from local recurrence in the resection margin. Glioma surgery is inherently lesional, and the response of brain tissue to surgery includes hemostasis, angiogenesis, reactive gliosis and inflammation. Unfortunately, these processes are also associated with tumorigenic side-effects. An increasing amount of evidence indicates that the response to a surgery-related brain injury is hijacked by residual glioma cells and participates in the local regeneration of tumor tissues at the resection margin...
May 17, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28507050/tumor-dormancy-and-relapse-from-a-natural-byproduct-of-evolution-to-a-disease-state
#4
REVIEW
Masoud H Manjili
Species evolve by mutations and epigenetic changes acting on individuals in a population; tumors evolve by similar mechanisms at a cellular level in a tissue. This article reviews growing evidence about tumor dormancy and suggests that (i) cellular malignancy is a natural byproduct of evolutionary mechanisms, such as gene mutations and epigenetic modifications, which is manifested in the form of tumor dormancy in healthy individuals as well as in cancer survivors; (ii) cancer metastasis could be an early dissemination event that could occur during malignant dormancy even before primary cancer is clinically detectable; and (iii) chronic inflammation is a key factor in awakening dormant malignant cells at the primary site, leading to primary cancer development, and at distant sites, leading to advanced stage diseases...
May 15, 2017: Cancer Research
https://www.readbyqxmd.com/read/28488695/blockade-of-ido-kynurenine-ahr-metabolic-circuitry-abrogates-ifn-%C3%AE-induced-immunologic-dormancy-of-tumor-repopulating-cells
#5
Yuying Liu, Xiaoyu Liang, Xiaonan Yin, Jiadi Lv, Ke Tang, Jingwei Ma, Tiantian Ji, Huafeng Zhang, Wenqian Dong, Xun Jin, Degao Chen, Yanchun Li, Songyan Zhang, Heidi Q Xie, Bin Zhao, Tong Zhao, Jinzhi Lu, Zhuo-Wei Hu, Xuetao Cao, F Xiao-Feng Qin, Bo Huang
Interactions with the immune system may lead tumorigenic cells into dormancy. However, the underlying molecular mechanism is poorly understood. Using a 3D fibrin gel model, we show that IFN-γ induces tumour-repopulating cells (TRCs) to enter dormancy through an indolamine 2,3-dioxygenase 1 (IDO1)-kynurenine (Kyn)-aryl hydrocarbon receptor (AhR)-p27 dependent pathway. Mechanistically, IFN-γ signalling triggers differentiated tumour cell apoptosis via STAT1; however, when IDO1 and AhR are highly expressed as in TRCs, IFN-γ results in IDO1/AhR-dependent p27 induction that prevents STAT1 signalling, thus suppressing the process of cell death and activating the dormancy program...
May 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28430641/the-regulation-of-%C3%AE-catenin-activity-and-function-in-cancer-therapeutic-opportunities
#6
REVIEW
Shuang Shang, Fang Hua, Zhuo-Wei Hu
Wnt/β-catenin signaling is an evolutionarily conserved and versatile pathway that is known to be involved in embryonic development, tissue homeostasis and a wide variety of human diseases. Aberrant activation of this pathway gives rise to the accumulation of β-catenin in the nucleus and promotes the transcription of many oncogenes such as c-Myc and CyclinD-1. As a result, it contributes to carcinogenesis and tumor progression of several cancers, including colon cancer, hepatocellular carcinoma, pancreatic cancer, lung cancer and ovarian cancer...
May 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28410147/the-roles-of-microglia-macrophages-in-tumor-progression-of-brain-cancer-and-metastatic-disease
#7
Shih-Ying Wu, Kounosuke Watabe
Malignant brain tumors and brain metastases are highly aggressive diseases that are often resistant to treatment. Consequently, the current prognosis of patients with brain tumors and metastases is dismal. Activated microglia and macrophages are often observed in close proximity to or within the malignant tumor masses, suggesting that microglia/macrophages play an important role in brain tumor progression. Microglia, being resident macrophages of the central nervous system, form a major component of the brain immune system...
June 1, 2017: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28391403/cytokine-induced-senescence-for-cancer-surveillance
#8
REVIEW
Thomas Wieder, Ellen Brenner, Heidi Braumüller, Oliver Bischof, Martin Röcken
The immune response is a first-line systemic defense to curb tumorigenesis and metastasis. Much effort has been invested to design antitumor interventions that would boost the immune system in its fight to defeat or contain cancerous growth. Tumor vaccination protocols, transfer of tumor-associated-antigen-specific T cells, T cell activity-regulating antibodies, and recombinant cytokines are counted among a toolbox filled with immunotherapeutic options. Although the mechanistic underpinnings of tumor immune control remain to be deciphered, these are studied with the goal of cancer cell destruction...
April 8, 2017: Cancer Metastasis Reviews
https://www.readbyqxmd.com/read/28390068/hostile-takeover-how-tumors-hijack-pre-existing-vascular-environments-to-thrive
#9
Frank Winkler
An increasing body of evidence suggests that solid tumors do not require the generation of new blood vessels, angiogenesis, to successfully grow, and to colonize normal tissue. Many tumor cells rather make best use of what they find: pre-existing blood vessels of the host. In these cases, the host vasculature is incorporated by the growing tumor, resulting in a new organ consisting of malignant and nonmalignant cell types. In consequence, pre-existing vessels are exploited by the tumor for optimal access to oxygen and nutrients...
April 8, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28344165/mechanisms-governing-metastatic-dormancy-in-breast-cancer
#10
REVIEW
Jürgen Dittmer
Breast cancer is a systemic disease characterized by early dissemination of tumor cells to distant organs. In this foreign environment, tumor cells may stay in a dormant state as single cells or as micrometastases for many years before growing out into a macrometastatic lesion. As metastasis is the primary cause for breast cancer-related death, it is important to understand the mechanisms underlying the maintenance of dormancy and dormancy escape to find druggable targets to eradicate metastatic tumor cells...
March 23, 2017: Seminars in Cancer Biology
https://www.readbyqxmd.com/read/28331999/the-acidic-microenvironment-as-a-possible-niche-of-dormant-tumor-cells
#11
REVIEW
Silvia Peppicelli, Elena Andreucci, Jessica Ruzzolini, Anna Laurenzana, Francesca Margheri, Gabriella Fibbi, Mario Del Rosso, Francesca Bianchini, Lido Calorini
Although surgical excision, chemo-, and radio-therapy are clearly advanced, tumors may relapse due to cells of the so-called "minimal residual disease". Indeed, small clusters of tumor cells persist in host tissues after treatment of the primary tumor elaborating strategies to survive and escape from immunological attacks before their relapse: this variable period of remission is known as "cancer dormancy". Therefore, it is crucial to understand and consider the major concepts addressing dormancy, to identify new targets and disclose potential clinical strategies...
March 22, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28314083/characterization-of-dormant-and-active-human-cancer-cells-by-quantitative-phase-imaging
#12
Peng Guo, Jing Huang, Marsha A Moses
The switch of tumor cells from a dormant, non-angiogenic phenotype to an active, angiogenic phenotype is a critical step in early cancer progression. To date, relatively little is known about the cellular behaviors of angiogenic and non-angiogenic tumor cell phenotypes. In this study, holographic imaging cytometry, a quantitative phase imaging (QPI) technique was used to continuously and non-invasively analyze, quantify, and compare a panel of fundamental cellular behaviors of angiogenic and non-angiogenic human osteosarcoma cells (KHOS) in a simple and economical way...
May 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28262977/metastatic-breast-cancer-cells-enter-into-dormant-state-and-express-cancer-stem-cells-phenotype-under-chronic-hypoxia
#13
Alessandra Carcereri de Prati, Elena Butturini, Antonella Rigo, Elisa Oppici, Michele Rossin, Diana Boriero, Sofia Mariotto
Tumor dormancy is a poorly understood stage in cancer progression characterized by mitotic cycle arrest in G0/G1 phase and low metabolism. The cells survive in a quiescent state and wait for appropriate environmental conditions to begin proliferation again giving rise to metastasis. Despite their key role in cancer development and metastasis, the knowledge about their biology and origin is still very limited due to the poorness of established in vitro models that faithfully recapitulated tumor dormancy. Using at least three cycles of 1% O2 hypoxia and reoxygenation, we establish and characterize the hypoxia-resistant human breast cancer cell line chMDA-MB-231 that can stably survive under 1% O2 condition by entering into dormant state characterized by arrest in G0/G1 phase and low metabolism...
March 6, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28249168/autocrine-igf1-signaling-mediates-pancreatic-tumor-cell-dormancy-in-the-absence-of-oncogenic-drivers
#14
Nirakar Rajbhandari, Wan-Chi Lin, Barbara L Wehde, Aleata A Triplett, Kay-Uwe Wagner
Mutant KRAS and c-MYC are oncogenic drivers and rational therapeutic targets for the treatment of pancreatic cancer. Although tumor growth and homeostasis are largely dependent on these oncogenes, a few residual cancer cells are able to survive the ablation of mutant KRAS and c-MYC. By performing a genome-wide gene expression analysis of in vivo-derived bulk tumor cells and residual cancer cells lacking the expression of mutant KRAS or c-MYC, we have identified an increase in autocrine IGF1/AKT signaling as a common survival mechanism in dormant cancer cells...
February 28, 2017: Cell Reports
https://www.readbyqxmd.com/read/28202775/winter-is-coming-tumor-cells-go-into-hibernation
#15
Amanda W Lund
In response to hypoxia in the primary tumor microenvironment, tumor cells induce a state of dormancy enabling their persistence at metastatic sites and resistance to therapy.
February 15, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28197538/cancer-cell-cannibalism-and-the-sasp-ripples-in-the-murky-waters-of-tumor-dormancy
#16
Thomas J Bartosh
Relapse in cancer patients following an apparent cure and a prolonged latency period, known as tumor dormancy, remains an unrelenting clinical crisis. Here, I expand on our recent findings that potentially link cancer cell cannibalism of bone marrow-derived mesenchymal stem/stromal cells (BM-MSCs) to the senescence-associated secretory phenotype (SASP) and tumor dormancy.
2017: Molecular & Cellular Oncology
https://www.readbyqxmd.com/read/28196146/chemotherapy-induces-adaptive-drug-resistance-and-metastatic-potentials-via-phenotypic-cxcr4-expressing-cell-state-transition-in-ovarian-cancer
#17
Hyun Hee Lee, Vanessa Bellat, Benedict Law
Ovarian cancer (OVC) patients who receive chemotherapy often acquire drug resistance within one year. This can lead to tumor reoccurrence and metastasis, the major causes of mortality. We report a transient increase of a small distinctive CXCR4High/CD24Low cancer stem cell population (CXCR4High) in A2780 and SKOV-3 OVC cell lines in response to cisplatin, doxorubicin, and paclitaxel, treatments. The withdrawal of the drug challenges reversed this cell-state transition. CXCR4High exhibits dormancy in drug resistance and mesenchymal-like invasion, migration, colonization, and tumor formation properties...
2017: PloS One
https://www.readbyqxmd.com/read/28115701/induction-of-dormancy-in-hypoxic-human-papillomavirus-positive-cancer-cells
#18
Karin Hoppe-Seyler, Felicitas Bossler, Claudia Lohrey, Julia Bulkescher, Frank Rösl, Lars Jansen, Arnulf Mayer, Peter Vaupel, Matthias Dürst, Felix Hoppe-Seyler
Oncogenic human papillomaviruses (HPVs) are closely linked to major human malignancies, including cervical and head and neck cancers. It is widely assumed that HPV-positive cancer cells are under selection pressure to continuously express the viral E6/E7 oncogenes, that their intracellular p53 levels are reconstituted on E6/E7 repression, and that E6/E7 inhibition phenotypically results in cellular senescence. Here we show that hypoxic conditions, as are often found in subregions of cervical and head and neck cancers, enable HPV-positive cancer cells to escape from these regulatory principles: E6/E7 is efficiently repressed, yet, p53 levels do not increase...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28039473/nanometronomic-treatment-of-4t1-breast-cancer-with-nanocaged-doxorubicin-prevents-drug-resistance-and-circumvents-cardiotoxicity
#19
Serena Mazzucchelli, Michela Bellini, Luisa Fiandra, Marta Truffi, Maria A Rizzuto, Luca Sorrentino, Erika Longhi, Manuela Nebuloni, Davide Prosperi, Fabio Corsi
Chemotherapeutic treatment of breast cancer is based on maximum tolerated dose (MTD) approach. However, advanced stage tumors are not effectively eradicated by MTD owing to suboptimal drug targeting, onset of therapeutic resistance and neoangiogenesis. In contrast, "metronomic" chemotherapy is based on frequent drug administrations at lower doses, resulting in neovascularization inhibition and induction of tumor dormancy. Here we show the potential of H-ferritin (HFn)-mediated targeted nanodelivery of metronomic doxorubicin (DOX) in the setting of a highly aggressive and metastatic 4T1 breast cancer mouse model with DOX-inducible expression of chemoresistance...
January 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/28039467/targeting-cancer-stem-cell-propagation-with-palbociclib-a-cdk4-6-inhibitor-telomerase-drives-tumor-cell-heterogeneity
#20
Gloria Bonuccelli, Maria Peiris-Pages, Bela Ozsvari, Ubaldo E Martinez-Outschoorn, Federica Sotgia, Michael P Lisanti
In this report, we systematically examined the role of telomerase activity in lung and ovarian cancer stem cell (CSC) propagation. For this purpose, we indirectly gauged telomerase activity, by linking the hTERT-promoter to eGFP. Using lung (A549) and ovarian (SKOV3) cancer cells, transduced with the hTERT-GFP reporter, we then employed GFP-expression levels to fractionate these cell lines into GFP-high and GFP-low populations. We functionally compared the phenotype of these GFP-high and GFP-low populations...
February 7, 2017: Oncotarget
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