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Cancer AND Apoptosis AND shear

Afu Fu, Shijun Ma, Na Wei, Blanche Xiao Xuan Tan, Ern Yu Tan, Kathy Qian Luo
Understanding the survival mechanism of metastatic cancer cells in circulation will provide new perspectives on metastasis prevention and also shed new light on metastasis-derived drug resistance. In this study, we made it feasible to detect apoptosis of circulating tumor cells (CTCs) in real-time by integrating a fluorescence resonance energy transfer (FRET)-based caspase sensor into one in vitro microfluidic circulatory system, and two in vivo models: zebrafish circulation and mouse lung metastatic model...
July 1, 2016: Oncotarget
Niravkumar R Patel, Aleksandr Piroyan, Abbegial H Nack, Corin A Galati, Mackenzi McHugh, Samantha Orosz, Amanda W Keeler, Sara O'Neal, William C Zamboni, Barbara Davis, Timothy P Coleman
Platinum (Pt) based chemotherapy is widely used to treat many types of cancer. Pt therapy faces challenges such as dose limiting toxicities, cumulative side effects, and multidrug resistance. Nanoemulsions (NEs) have tremendous potential in overcoming these challenges as they can be designed to improve circulation time, limit non-disease tissue uptake, and enhance tumor uptake by surface modification. We designed novel synthesis of three difattyacid platins, dimyrisplatin, dipalmiplatin, and distearyplatin, suitable for encapsulation in the oil core of an NE...
May 24, 2016: Molecular Pharmaceutics
Ceyda Tuba Sengel-Turk, Canan Hascicek, Filiz Bakar, Elif Simsek
Recent clinical and epidemiological researches have declared that non-steroidal anti-inflammatory agents may display as antineoplastic agents and indicate pro-apoptotic and antiproliferative effects on cancer cells. The major purpose of this research was to develop a novel poly(ethyleneglycol)-block-poly(ε-caprolactone) (PEG-b-PCL) nano-sized particles encapsulated with nimesulide (NMS), a selective COX-2 inhibitor, and to evaluate its anticancer activity against MCF-7 breast cancer cells. NMS-encapsulated PEG-b-PCL nanoparticles were fabricated using three different production techniques: (i) by emulsion-solvent evaporation using a high shear homogenizer, (ii) by emulsion-solvent evaporation using an ultrasonicator, and (iii) by nanoprecipitation...
March 23, 2016: AAPS PharmSciTech
Q-C Luan, Y-R Sun, P Han, Y Chen
OBJECTIVE: Ovarian cancer accounted for the first cause of death in female reproductive system tumor even with the operation and chemotherapy. We sought to evaluate the therapeutic potential of p53 up-regulated modulator of apoptosis (PUMA) in ovarian cancer. MATERIALS AND METHODS: An adenovirus expressing PUMA (Ad-PUMA), alone or in combination with chemotherapeutic agents, was used to treat two different ovarian cancer cell lines. The mechanism of PUMA-mediated growth suppression and apoptosis was investigated by analysis of caspase-9 activation and the change of mitochondrial membrane potential (Δψm)...
December 2015: European Review for Medical and Pharmacological Sciences
Xiao-Liang Lou, Jian Sun, Shu-Qi Gong, Xue-Feng Yu, Rui Gong, Huan Deng
Metastasis is the main cause of cancer-associated mortality. During this complicated process, some cancer cells, also called circulating tumor cells (CTCs), detach from primary sites, enter bloodstream and extravasate at metastatic site. Thrombocytosis is frequently observed in patients with metastatic cancers suggesting the important role of platelets in metastasis. Therefore this review focuses on how platelets facilitate the generation of CTCs, protect them from various host attacks, such as immune assaults, apoptosis and shear stress, and regulate CTCs intravasation/extravasation...
October 2015: Chinese Journal of Cancer Research, Chung-kuo Yen Cheng Yen Chiu
Michael J Mitchell, Celine Denais, Maxine F Chan, Zhexiao Wang, Jan Lammerding, Michael R King
Metastasis contributes to over 90% of cancer-related deaths and is initiated when cancer cells detach from the primary tumor, invade the basement membrane, and enter the circulation as circulating tumor cells (CTCs). While metastasis is viewed as an inefficient process with most CTCs dying within the bloodstream, it is evident that some CTCs are capable of resisting hemodynamic shear forces to form secondary tumors in distant tissues. We hypothesized that nuclear lamins A and C (A/C) act as key structural components within CTCs necessary to resist destruction from elevated shear forces of the bloodstream...
December 1, 2015: American Journal of Physiology. Cell Physiology
Hong-ting Wang, Cun-qin Wang
27-O-(E)-p-coumaric acyl ursolic acid( DY-17) from Ilex latifolia is a compound of the monomer. To investigate the DY-17 inducing apoptosis in the human breast cancer cell line, the MDA-MB-231 cells were used as research object in this experiment. The proliferation activity of the MDA-MB-231 cells stimulated with the different concentrations of DY-17 (20, 40 µmol · L(-1)) was detected at different time( 12, 24, 36, 48, 60,72 h) . We surveyed the DY-17 inducing apoptosis of the MDA-MB-231 cells with the fluorescent staining technology...
February 2015: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Philipp Schlaermann, Benjamin Toelle, Hilmar Berger, Sven C Schmidt, Matthias Glanemann, Jürgen Ordemann, Sina Bartfeld, Hans J Mollenkopf, Thomas F Meyer
BACKGROUND AND AIMS: Helicobacter pylori is the causative agent of gastric diseases and the main risk factor in the development of gastric adenocarcinoma. In vitro studies with this bacterial pathogen largely rely on the use of transformed cell lines as infection model. However, this approach is intrinsically artificial and especially inappropriate when it comes to investigating the mechanisms of cancerogenesis. Moreover, common cell lines are often defective in crucial signalling pathways relevant to infection and cancer...
February 2016: Gut
Sebastian Mueller, Helmut Karl Seitz, Vanessa Rausch
Alcoholic liver disease (ALD) is the most common liver disease in the Western world. For many reasons, it is underestimated and underdiagnosed. An early diagnosis is absolutely essential since it (1) helps to identify patients at genetic risk for ALD; (2) can trigger efficient abstinence namely in non-addicted patients; and (3) initiate screening programs to prevent life-threatening complications such as bleeding from varices, spontaneous bacterial peritonitis or hepatocellular cancer. The two major end points of ALD are alcoholic liver cirrhosis and the rare and clinically-defined alcoholic hepatitis (AH)...
October 28, 2014: World Journal of Gastroenterology: WJG
Ke Tian, Limin Wang, Ruiqing Di, Jianzhong Xu, Guangheng Li, Zhifu Li
MicroRNA has proved to be low expression in many tumor cells. In addition, it was also proved that as a kind of cancer suppressor gene, miR-199a-3p in miRNA can affect the growth and invasion ability of tumor cells. This paper aims to discuss the effect of miRNA to osteosarcoma cell. It used synthetic mature miR-199a-3p sequence simulants to transfect osteosarcoma cell and took negative contrast sequence (NC mimics) transfection cell as negative contrast. After transfection, qRT-PCR was applied to detect the expression quantity of miR-199a-3p in every group...
September 2014: Pakistan Journal of Pharmaceutical Sciences
Michael J Mitchell, Michael R King
Cancer metastasis, the process of cancer cell migration from a primary to distal location, typically leads to a poor patient prognosis. Hematogenous metastasis is initiated by intravasation of circulating tumor cells (CTCs) into the bloodstream, which are then believed to adhere to the luminal surface of the endothelium and extravasate into distal locations. Apoptotic agents such as tumor necrosis factor (TNF) apoptosis-inducing ligand (TRAIL), whether in soluble ligand form or expressed on the surface of natural killer (NK) cells, have shown promise in treating CTCs to reduce the probability of metastasis...
January 18, 2013: New Journal of Physics
Chi-Wen Luo, Chia-Ching Wu, Hui-Ju Ch'ang
Recent studies revealed that the interstitial fluid flow in and around tumor tissue not only played an important role in delivering anticancer agents, but also affected the microenvironment, mostly hypoxia, in modulating tumor radio-sensitivity. The current study investigated the hypoxia-independent mechanisms of flow-induced shear stress in sensitizing tumors to radiation. Colon cancer cells were seeded onto glass slides pre-coated with fibronectin. A parallel-plate flow chamber system was used to impose fluid shear stress...
September 2014: Biochimica et Biophysica Acta
Hasan Erbil Abaci, Yu-I Shen, Scott Tan, Sharon Gerecht
Studying human vascular disease in conventional cell cultures and in animal models does not effectively mimic the complex vascular microenvironment and may not accurately predict vascular responses in humans. We utilized a microfluidic device to recapitulate both shear stress and O2 levels in health and disease, establishing a microfluidic vascular model (μVM). Maintaining human endothelial cells (ECs) in healthy-mimicking conditions resulted in conversion to a physiological phenotype namely cell elongation, reduced proliferation, lowered angiogenic gene expression and formation of actin cortical rim and continuous barrier...
2014: Scientific Reports
Chueh-Chuan Yen, Chung-Der Hsiao, Wei-Ming Chen, Yao-Shan Wen, Yung-Chan Lin, Ting-Wei Chang, Fang-Yi Yao, Shih-Chieh Hung, Jir-You Wang, Jen-Hwey Chiu, Hsei-Wei Wang, Chi-Hung Lin, Tain-Hsiung Chen, Paul Chih-Hsueh Chen, Chien-Lin Liu, Cheng-Hwai Tzeng, Jonathan A Fletcher
Polo-like kinase 1 (PLK1), a critical cell cycle regulator, has been identified as a potential target in osteosarcoma (OS). 15-deoxy-Δ12, 14-prostaglandin J2 (15d-PGJ2), a prostaglandin derivative, has shown its anti-tumor activity by inducing apoptosis through reactive oxygen species (ROS)-mediated inactivation of v-akt, a murine thymoma viral oncogene homolog, (AKT) in cancer cells. In the study analyzing its effects on arthritis, 15d-PGJ2 mediated shear-induced chondrocyte apoptosis via protein kinase A (PKA)-dependent regulation of PLK1...
February 15, 2014: Oncotarget
Alexander V Allain, Van T Hoang, George F Lasker, Edward A Pankey, Subramanyam N Murthy, Philip J Kadowitz
Since its discovery, nitric oxide (NO) has been observed to play an important role in the physiology of single-celled organisms as well as high-order vertebrates. In this review, we will discuss the involvement of NO in bacterial, plant and human systems. NO originates from a variety of sources, namely bacterial, plant, and mammalian nitric oxide synthases which oxidize L-arginine. Bacterial NO is involved in toxin synthesis, signaling and biofilm formation. Organisms use NO to mediate oxidative stress incurred during the innate immune response...
2011: Current Topics in Pharmacology
Michael J Mitchell, Elizabeth Wayne, Kuldeepsinh Rana, Chris B Schaffer, Michael R King
Metastasis through the bloodstream contributes to poor prognosis in many types of cancer. Mounting evidence implicates selectin-based adhesive interactions between cancer cells and the blood vessel wall as facilitating this process, in a manner similar to leukocyte trafficking during inflammation. Here, we describe a unique approach to target and kill colon and prostate cancer cells in the blood that causes circulating leukocytes to present the cancer-specific TNF-related apoptosis inducing ligand (TRAIL) on their surface along with E-selectin adhesion receptor...
January 21, 2014: Proceedings of the National Academy of Sciences of the United States of America
Ulrich Richter
Hematogenous metastasis is still a poorly understood phenomenon. The rate-limiting step within the metastatic cascade is not yet clear although it may be estimated that the extravasation of circulating tumor cells is a step of crucial importance, as most tumor cells that are shed into circulation undergo apoptosis. The process of extravasation includes a cascade of consecutive steps, starting with adhesion of tumor cells circulating in the bloodstream to endothelial cells, mimicking leukocyte adhesion and transmigration...
2014: Methods in Molecular Biology
Li-mei Fan, Jing Su, Hui Dong, Min Wei, Man-hua Cui
OBJECTIVE: To explore the effects of GRP78 suppression on the sensitivity to cisplatin and elucidate the role and mechanism of GRP78 in ovarian cancer cisplatin resistance. METHODS: The GRP78 siRNA expression plasmid was constructed to suppress GRP78 expression. Cell viability was detected by methyl thiazolyl tetrazolium (MTT) assay. Endoplasmic reticulum stress-related apoptosis related protein expressions were detected by reverse transcription-polymerase chain reaction (RT-PCR) and Western blot...
May 7, 2013: Zhonghua Yi Xue za Zhi [Chinese medical journal]
Sheng-Chieh Lien, Shun-Fu Chang, Pei-Ling Lee, Shu-Yi Wei, Margaret Dah-Tsyr Chang, Jang-Yang Chang, Jeng-Jiann Chiu
Mechanical forces induced by interstitial fluid flow in and surrounding tissues and by blood/lymphatic flow in vessels may modulate cancer cell invasion and metastasis and anticancer drug delivery. Our previous study demonstrated that laminar flow-induced shear stress induces G2/M arrest in tumor cells. However, whether shear stress modulates final cell fate remains unclear. In this study, we investigated the role of flow-induced shear stress in modulating the survival of four human tumor cell lines, i.e., Hep3B hepatocarcinoma cells, MG63 osteosarcoma cells, SCC25 oral squamous carcinoma cells, and A549 carcinomic alveolar basal epithelial cells...
December 2013: Biochimica et Biophysica Acta
Frank Stenner, Heike Liewen, Stephan Göttig, Reinhard Henschler, Norbert Markuly, Sascha Kleber, Michael Faust, Axel Mischo, Stefan Bauer, Martin Zweifel, Alexander Knuth, Christoph Renner, Andreas Wadle
RP1 (synonym: MAPRE2, EB2) is a member of the microtubule binding EB1 protein family, which interacts with APC, a key regulatory molecule in the Wnt signalling pathway. While the other EB1 proteins are well characterized the cellular function and regulation of RP1 remain speculative to date. However, recently RP1 has been implicated in pancreatic cancerogenesis. CK2 is a pleiotropic kinase involved in adhesion, proliferation and anti-apoptosis. Overexpression of protein kinase CK2 is a hallmark of many cancers and supports the malignant phenotype of tumor cells...
2013: PloS One
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