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Shear Stress AND Cancer

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https://www.readbyqxmd.com/read/28820394/the-c-terminal-region-of-the-focal-adhesion-kinase-f1-domain-binds-akt1-and-inhibits-pressure-induced-cell-adhesion
#1
M D Basson, B Zeng, S Wang
Increased extracellular pressure or shear stress activate a complex signal pathway that stimulates integrin binding affinity and potentiates metastatic cell adhesion. Inhibiting either focal adhesion kinase (FAK) and Akt1 can block this pathway, but risks interfering with the diverse other functions of each kinase. However, the mechanotransduced signal pathway involves a novel Akt1-FAK interaction not required for most FAK or Akt1 function, so modeling and blocking this interaction seems a desirable target...
June 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28819843/microfilter-based-capture-and-release-of-viable-circulating-tumor-cells
#2
Siddarth Rawal, Zheng Ao, Ram H Datar, Ashutosh Agarwal
Microfilters with slot-pore geometry can be used for size-based capture of circulating tumor cells (CTC) from the blood of cancer patients. The slot pore geometry reduces the shear stress that the cells would typically experience during filtration process and allows the cells to remain viable. The microfilter provides a platform capable of high CTC capture efficiency; however, the release of these cells from the filter following capture is nontrivial, possibly due to the strong nonspecific electrostatic adhesion of CTC to the microfilter surface...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28802749/enhanced-fluorescence-detection-of-proteins-using-zno-nanowires-integrated-inside-microfluidic-chips
#3
Lingxia Guo, Yuchen Shi, Xiangfei Liu, Zhitao Han, Zhenjie Zhao, Yong Chen, Wenhui Xie, Xin Li
Nanostructure-enhanced detection is promising for a number of applications such as early cancer diagnosis, environmental monitoring and mine safety, among which nanostructures integrated microfluidic chips offers unique advantage of ultra-low quantitative analyses. Here, dense ZnO nanowires of varied diameter and length were obtained by changing the content of polyethyleneimine (PEI) and growth time via simple hydrothermal growth in microfluidic channels for protein detection. We showed that this approach was superiorly efficient compared to the conventional hydrothermal method due to the flow-induced replenishment of nutrient and the effect of shear stress...
August 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28798857/the-role-of-shear-stress-and-altered-tissue-properties-on-endothelial-to-mesenchymal-transformation-and-tumor-endothelial-cell-interaction
#4
Sara G Mina, Peter Huang, Bruce T Murray, Gretchen J Mahler
Tumor development is influenced by stromal cells in aspects including invasion, growth, angiogenesis, and metastasis. Activated fibroblasts are one group of stromal cells involved in cancer metastasis, and one source of activated fibroblasts is endothelial to mesenchymal transformation (EndMT). EndMT begins when the endothelial cells delaminate from the cell monolayer, lose cell-cell contacts, lose endothelial markers such as vascular endothelial-cadherin (VE-cadherin), gain mesenchymal markers like alpha-smooth muscle actin (α-SMA), and acquire mesenchymal cell-like properties...
July 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28798840/a-microfluidic-device-for-isolation-and-characterization-of-transendothelial-migrating-cancer-cells
#5
Xin Cui, Weijin Guo, Yubing Sun, Baoce Sun, Shuhuan Hu, Dong Sun, Raymond H W Lam
Transendothelial migration of cancer cells is a critical stage in cancer, including breast cancer, as the migrating cells are generally believed to be highly metastatic. However, it is still challenging for many existing platforms to achieve a fully covering endothelium and to ensure transendothelial migration capability of the extracted cancer cells for analyses with high specificity. Here, we report a microfluidic device containing multiple independent cell collection microchambers underneath an embedded endothelium such that the transendothelial-migrated cells can be selectively collected from only the microchambers with full coverage of an endothelial layer...
January 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28778090/trastuzumab-distribution-in-an-in-vivo-and-in-vitro-model-of-brain-metastases-of-breast-cancer
#6
Tori B Terrell-Hall, Mohamed Ismail Nounou, Fatema El-Amrawy, Jessica I G Griffith, Paul R Lockman
BACKGROUND: Drug and antibody delivery to brain metastases has been highly debated in the literature. The blood-tumor barrier (BTB) is more permeable than the blood-brain barrier (BBB), and has shown to have highly functioning efflux transporters and barrier properties, which limits delivery of targeted therapies. METHODS: We characterized the permeability of 125I-trastuzumab in an in-vivo, and fluorescent trastuzumab-Rhodamine123 (t-Rho123) in a novel microfluidic in-vitro, BBB and BTB brain metastases of breast cancer model...
July 26, 2017: Oncotarget
https://www.readbyqxmd.com/read/28741084/towards-the-prediction-of-flow-induced-shear-stress-distributions-experienced-by-breast-cancer-cells-in-the-lymphatics
#7
S T Morley, D T Newport, M T Walsh
Tumour metastasis in the lymphatics is a crucial step in the progression of breast cancer. The dynamics by which breast cancer cells (BCCs) travel in the lymphatics remains poorly understood. The goal of this work is to develop a model capable of predicting the shear stresses metastasising BCCs experience using numerical and experimental techniques. This paper models the fluidic transport of large particles ([Formula: see text] where [Formula: see text] is the particle diameter and W is the channel width) subjected to lymphatic flow conditions ([Formula: see text]), in a [Formula: see text] microchannel...
July 24, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28737696/targeting-platelets-for-the-treatment-of-cancer
#8
REVIEW
Omar Elaskalani, Michael C Berndt, Marco Falasca, Pat Metharom
The majority of cancer-associated mortality results from the ability of tumour cells to metastasise leading to multifunctional organ failure and death. Disseminated tumour cells in the blood circulation are faced with major challenges such as rheological shear stresses and cell-mediated cytotoxicity mediated by natural killer cells. Nevertheless, circulating tumour cells with metastatic ability appear equipped to exploit host cells to aid their survival. Despite the long interest in targeting tumour-associated host cells such as platelets for cancer treatment, the clinical benefit of this strategy is still under question...
July 22, 2017: Cancers
https://www.readbyqxmd.com/read/28698503/cd15s-cd62e-interaction-mediates-the-adhesion-of-non-small-cell-lung-cancer-cells-on-brain-endothelial-cells-implications-for-cerebral-metastasis
#9
Samah A Jassam, Zaynah Maherally, James R Smith, Keyoumars Ashkan, Federico Roncaroli, Helen L Fillmore, Geoffrey J Pilkington
Expression of the cell adhesion molecule (CAM), Sialyl Lewis X (CD15s) correlates with cancer metastasis, while expression of E-selectin (CD62E) is stimulated by TNF-α. CD15s/CD62E interaction plays a key role in the homing process of circulating leukocytes. We investigated the heterophilic interaction of CD15s and CD62E in brain metastasis-related cancer cell adhesion. CD15s and CD62E were characterised in human brain endothelium (hCMEC/D3), primary non-small cell lung cancer (NSCLC) (COR-L105 and A549) and metastatic NSCLC (SEBTA-001 and NCI-H1299) using immunocytochemistry, Western blotting, flow cytometry and immunohistochemistry in human brain tissue sections...
July 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28674748/platelet-activating-factor-podoplanin-from-discovery-to-drug-development
#10
Ai Takemoto, Kenichi Miyata, Naoya Fujita
Tumor cell-induced platelet aggregation facilitates hematogenous metastasis by promoting tumor embolization, preventing immunological assaults and shear stress, and the platelet-releasing growth factors support tumor growth and invasion. Podoplanin, also known as Aggrus, is a type I transmembrane mucin-like glycoprotein and is expressed on wide range of tumor cells. Podoplanin has a role in platelet aggregation and metastasis formation through the binding to its platelet receptor, C-type lectin-like receptor 2 (CLEC-2)...
July 3, 2017: Cancer Metastasis Reviews
https://www.readbyqxmd.com/read/28658586/small-bubble-transport-and-splitting-dynamics-in-a-symmetric-bifurcation
#11
Adnan Qamar, Matthew Warnez, Doug T Valassis, Megan E Guetzko, Joseph L Bull
Simulations of small bubbles traveling through symmetric bifurcations are conducted to garner information pertinent to gas embolotherapy, a potential cancer treatment. Gas embolotherapy procedures use intra-arterial bubbles to occlude tumor blood supply. As bubbles pass through bifurcations in the blood stream nonhomogeneous splitting and undesirable bioeffects may occur. To aid development of gas embolotherapy techniques, a volume of fluid method is used to model the splitting process of gas bubbles passing through artery and arteriole bifurcations...
June 28, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28636424/fluid-shear-stress-regulates-hepg2-cell-migration-though-time-dependent-integrin-signaling-cascade
#12
Hongchi Yu, Yang Shen, Jingsi Jin, Yingying Zhang, Tang Feng, Xiaoheng Liu
Hepatocellular carcinoma (HCC) is a subtype of malignant liver cancer with poor prognosis and limited treatment options. It is noteworthy that mechanical forces in tumor microenvironment play a pivotal role in mediating the behaviors and functions of tumor cells. As an instrumental type of mechanical forces in vivo, fluid shear stress (FSS) has been reported having potent physiologic and pathologic effects on cancer progression. However, the time-dependent mechanochemical transduction in HCC induced by FSS remains unclear...
June 21, 2017: Cell Adhesion & Migration
https://www.readbyqxmd.com/read/28597757/the-cancer-theory-of-pulmonary-arterial-hypertension
#13
Olivier Boucherat, Geraldine Vitry, Isabelle Trinh, Roxane Paulin, Steeve Provencher, Sebastien Bonnet
Pulmonary arterial hypertension (PAH) remains a mysterious killer that, like cancer, is characterized by tremendous complexity. PAH development occurs under sustained and persistent environmental stress, such as inflammation, shear stress, pseudo-hypoxia, and more. After inducing an initial death of the endothelial cells, these environmental stresses contribute with time to the development of hyper-proliferative and apoptotic resistant clone of cells including pulmonary artery smooth muscle cells, fibroblasts, and even pulmonary artery endothelial cells allowing vascular remodeling and PAH development...
April 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28589644/endothelial-to-mesenchymal-transformation-is-induced-by-altered-extracellular-matrix-in-aortic-valve-endothelial-cells
#14
Sudip Dahal, Peter Huang, Bruce T Murray, Gretchen J Mahler
Alterations in shear stress, mechanical deformation, extracellular matrix (ECM) composition and exposure to inflammatory conditions are known to cause endothelial to mesenchymal transformation (EndMT). This change in endothelial phenotype has only recently been linked to adult pathologies such as cancer progression, organ fibrosis, and calcific aortic valve disease; and its function in adult physiology, especially in response to tissue mechanics, has not been rigorously investigated. EndMT is a response to mechanical and biochemical signals that results in the remodeling of underlying tissues...
June 7, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28541365/responses-of-human-adipose-derived-stem-cells-to-interstitial-level-of-extremely-low-shear-flows-regarding-differentiation-morphology-and-proliferation
#15
Sung-Hwan Kim, Kihoon Ahn, Joong Yull Park
Human cells encounter a range of shear stress levels in situ and this natural variability in shear stress implies that realistic investigations of cell type characteristics may depend on nontrivial shear stress models. Human adipose-derived stem cells (hASCs) differentiate near the blood capillary vessels where interstitial flows predominate. However, the effects of interstitial levels of shear on hASCs are not fully understood. In this study, we propose a microfluidic shear generation system, in which a gradient distribution of the interstitial level of shear flow is created to investigate the effects of interstitial-level shear flow on hASCs...
June 13, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28529671/the-advection-of-microparticles-mcf-7-and-mda-mb-231-breast-cancer-cells-in-response-to-very-low-reynolds-numbers
#16
Sinéad T Morley, Michael T Walsh, David T Newport
The lymphatic system is an extensive vascular network that serves as the primary route for the metastatic spread of breast cancer cells (BCCs). The dynamics by which BCCs travel in the lymphatics to distant sites, and eventually establish metastatic tumors, remain poorly understood. Particle tracking techniques were employed to analyze the behavior of MCF-7 and MDA-MB-231 BCCs which were exposed to lymphatic flow conditions in a 100 μm square microchannel. The behavior of the BCCs was compared to rigid particles of various diameters (η = dp/H= 0...
May 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28506222/computational-fluid-dynamics-study-of-intra-arterial-chemotherapy-for-oral-cancer
#17
Hiroaki Kitajima, Marie Oshima, Toshinori Iwai, Yoshihito Ohhara, Yasuharu Yajima, Kenji Mitsudo, Iwai Tohnai
BACKGROUND: Intra-arterial chemotherapy (IAC) for oral cancer can deliver a higher concentration of anticancer agent into a tumor-feeding artery than intravenous systemic chemotherapy. However, distribution of anticancer agent into several branches of the external carotid artery (ECA) in IAC has not demonstrated sufficient treatment efficacy. To improve the effectiveness of IAC, the flow distribution of anticancer agent into the branches of the ECA in several IAC methods was investigated using computational fluid dynamics (CFD)...
May 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28478838/heterogeneity-of-hypoxia-in-solid-tumours-and-mechanochemical-reactions-with-oxygen-nanobubbles
#18
V B Orel, M A Zabolotny, V E Orel
Tumour hypoxia leads to radio and chemotherapy resistance among cancer patients. The aim of this paper is to formulate a hypothesis on the heterogeneity of hypoxia in solid tumours. Tumour vasculature is known to be significantly variable. The great structural and functional abnormalities of tumour microcirculation cause spatial and temporal heterogeneity in its perfusion. Tumours have constantly been under the influence of pulsatile blood perfusion with variable pressure that initiates inhomogeneous erythrocyte deformation and following impact on oxygen disorder release from red blood cells into plasma within the blood vessel...
May 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28478797/effect-of-matrix-rigidity-on-organ-specific-capture-of-tumor-cells-by-flow
#19
P Ma, X Shen, P Tan, L Yang, W Liu
Accumulating evidences have suggested that tumor metastasis exists prominent organ discrepancy. In this progression, the capture of intravascular tumor cells (TCs) to endothelium in distant tissues and organs plays a decisive role in the organ-specific metastasis formation. However, the mechanism of tumor cells preferentially arrest and adhere to endothelial cells (ECs) of target organ still remains elusive. By using the parallel plate flow chamber and the polyacrylamide gels with different matrix stiffness, we here explored the combined effects of matrix rigidity, shear stress, and chemokine SDF-1 on the capture of circulating tumor cells to ECs in the bloodstream...
April 29, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28381539/transient-tissue-priming-via-rock-inhibition-uncouples-pancreatic-cancer-progression-sensitivity-to-chemotherapy-and-metastasis
#20
Claire Vennin, Venessa T Chin, Sean C Warren, Morghan C Lucas, David Herrmann, Astrid Magenau, Pauline Melenec, Stacey N Walters, Gonzalo Del Monte-Nieto, James R W Conway, Max Nobis, Amr H Allam, Rachael A McCloy, Nicola Currey, Mark Pinese, Alice Boulghourjian, Anaiis Zaratzian, Arne A S Adam, Celine Heu, Adnan M Nagrial, Angela Chou, Angela Steinmann, Alison Drury, Danielle Froio, Marc Giry-Laterriere, Nathanial L E Harris, Tri Phan, Rohit Jain, Wolfgang Weninger, Ewan J McGhee, Renee Whan, Amber L Johns, Jaswinder S Samra, Lorraine Chantrill, Anthony J Gill, Maija Kohonen-Corish, Richard P Harvey, Andrew V Biankin, T R Jeffry Evans, Kurt I Anderson, Shane T Grey, Christopher J Ormandy, David Gallego-Ortega, Yingxiao Wang, Michael S Samuel, Owen J Sansom, Andrew Burgess, Thomas R Cox, Jennifer P Morton, Marina Pajic, Paul Timpson
The emerging standard of care for patients with inoperable pancreatic cancer is a combination of cytotoxic drugs gemcitabine and Abraxane, but patient response remains moderate. Pancreatic cancer development and metastasis occur in complex settings, with reciprocal feedback from microenvironmental cues influencing both disease progression and drug response. Little is known about how sequential dual targeting of tumor tissue tension and vasculature before chemotherapy can affect tumor response. We used intravital imaging to assess how transient manipulation of the tumor tissue, or "priming," using the pharmaceutical Rho kinase inhibitor Fasudil affects response to chemotherapy...
April 5, 2017: Science Translational Medicine
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