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DC Beads

Tianming Lu, Cecile Pacoret, David Heriban, Abdenbi Mohand-Ousaid, Stephane Regnier, Vincent Hayward
This paper describes a haptic interface that has a uniform response over the entire human tactile frequency range. Structural mechanics makes it very difficult to implement articulated mechanical systems that can transmit high frequency signals. Here, we separated the frequency range into two frequency bands. The lower band is within the first structural mode of the corresponding haptic device while the higher one can be transmitted accurately by a fast actuator operating from conservation of momentum, that is, without reaction forces to the ground...
December 23, 2016: IEEE Transactions on Haptics
Peter Popovic, Borut Stabuc, Rado Jansa, Manca Garbajs
BACKGROUND: The purpose of this retrospective study was to evaluate treatment response, adverse events and survival rates of patients with intermediate stage HCC treated with superselective doxorubicin-loaded DC Bead transarterial chemoembolization (DEBDOX) under cone beam computed tomography (CBCT) control. PATIENTS AND METHODS: Between October 2010 and June 2012, 35 consecutive patients with intermediate stage HCC (32 male, 3 female; average age, 67.5 ± 7.8 years; 22 patients Child-Pugh class A, 8 class B, 5 without cirrhosis) were treated with DEBDOX TACE...
December 1, 2016: Radiology and Oncology
Myungsu Lee, Jin Wook Chung, Kwang-Hun Lee, Jong Yun Won, Ho Jong Chun, Han Chu Lee, Jin Hyoung Kim, In Joon Lee, Saebeom Hur, Hyo-Cheol Kim, Yoon Jun Kim, Gyoung Min Kim, Seung-Moon Joo, Jung Suk Oh
PURPOSE: To assess the efficacy and safety of transcatheter arterial chemoembolization with drug-eluting embolic (DEE) agents for nodular hepatocellular carcinoma (HCC). MATERIALS AND METHODS: The study design was a prospective multicenter registry-based, single-arm clinical trial that included 152 patients. One hundred three (67.8%) had a Child-Pugh class/score of A5, 114 (75.0%) had a performance status of 0, and 77 (50.7%) had Barcelona Clinic Liver Cancer (BCLC) stage A disease...
November 14, 2016: Journal of Vascular and Interventional Radiology: JVIR
Hee Chul Nam, Bohyun Jang, Myeong Jun Song
Transarterial chemoembolization (TACE) is a widely used standard treatment for patients with hepatocellular carcinoma (HCC) who are not suitable candidates for curative treatments. The rationale for TACE is that intra-arterial chemotherapy using lipiodol and chemotherapeutic agents, followed by selective vascular embolization, results in a strong cytotoxic effect as well as ischemia (conventional TACE). Recently, drug-eluting beads (DC Beads(®)) have been developed for transcatheter treatment of HCC to deliver higher doses of the chemotherapeutic agent and to prolong contact time with the tumor...
October 28, 2016: World Journal of Gastroenterology: WJG
Karolin J Paprottka, Tobias Waggershauser, Johannes Rübenthaler, Felix J Paprottka, Dirk A Clevert, Maximilian F Reiser, Philipp M Paprottka
OBJECTIVE: To evaluate various embolization particles on their physical properties with special regard on morphological variability and elasticity. METHODS: 8 embolization particles (EmboCept®, Contour SE® Microspheres, Embosphere® Micorspheres 400 μm, 500 μm, 1300 μm, Embozene® Microspheres, DC Beads®, Embozene Tandem®) were evaluated and graduated from 1-6 microscopically due to morphologic changes in vitro before, during and after their catheter passage by 4 blinded reviewers...
October 14, 2016: Clinical Hemorheology and Microcirculation
Thaïs Baert, Abhishek D Garg, Eva Vindevogel, Anaïs VAN Hoylandt, Godelieve Verbist, Patrizia Agostinis, Ignace Vergote, A N Coosemans
BACKGROUND/AIM: Dendritic cell (DC) immunotherapy induces tumor-reactive T-cells. We optimized the maturation of murine DC against ovarian cancer. MATERIALS AND METHODS: Immature DC were generated from bone-marrow progenitor cells and loaded with hypericin-photodynamic-treated (Hyp-PDT) tumor cells (primary maturation). Lipopolysacharide (LPS 1 μg/ml) was used as a secondary maturation stimulus. After 24 h, maturation was assessed using flow cytometry. For in vivo experiments, C57BL/6 mice were vaccinated subcutaneously with matured, loaded mature DC...
November 2016: Anticancer Research
Emelie Ahnfelt, Erik Sjögren, Per Hansson, Hans Lennernäs
The release rate of doxorubicin (DOX) from the drug-delivery system (DDS), DC Bead, was studied by 2 miniaturized in vitro methods: free-flowing and sample reservoir. The dependencies of the release mechanisms on in vitro system conditions were investigated experimentally and by theoretical modeling. An inverse relationship was found between release rates and bead size, most likely due to the greater total surface area. The release rates correlated positively with temperature, release medium volume, and buffer strength, although the release medium volume had larger effect than the buffer strength...
September 20, 2016: Journal of Pharmaceutical Sciences
Emelie Ahnfelt, Erik Sjögren, Per Hansson, Hans Lennernäs
The release rate of doxorubicin (DOX) from the drug-delivery system (DDS), DC Bead, was studied by 2 miniaturized in vitro methods: free-flowing and sample reservoir. The dependencies of the release mechanisms on in vitro system conditions were investigated experimentally and by theoretical modeling. An inverse relationship was found between release rates and bead size, most likely due to the greater total surface area. The release rates correlated positively with temperature, release medium volume, and buffer strength, although the release medium volume had larger effect than the buffer strength...
November 2016: Journal of Pharmaceutical Sciences
Song Chen, Lisha Lu, Weiqiang Wang, Ting Xue, Juan Yu, Zhina Sun, Chunxiao Zhao, Fang Liao
Objective To explore the mechanism modulating the function of dendritic cells (DCs) and promoting the T cell response by lipopolysaccharide (LPS). Methods Splenic DCs were purified with anti-CD11c immunomagnetic beads. After DCs were stimulated with LPS, the expressions of co-stimulatory molecules CD80 and CD86 on the DCs were detected by flow cytometry. The protein levels of pro-inflammatory cytokines interleukin 4 (IL-4), IL-5, IL-6, IL-12p40, IL-12p70 and tumor necrosis factor alpha (TNF-α) in the culture supernatant were measured by ELISA...
September 2016: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
Dorothea Fischbacher, Marion Merle, Anja Liepert, Christine Grabrucker, Tanja Kroell, Andreas Kremser, Julia Dreyßig, Markus Freudenreich, Friedhelm Schuster, Arndt Borkhardt, Doris Kraemer, Claus-Henning Koehne, Hans-Jochem Kolb, Christoph Schmid, Helga Maria Schmetzer
To enlighten interactions between autologous, allogeneic or T-cells from patients after stem cell transplantation with leukaemia-derived-dendritic-cells containing dendritic cells or blast containing mononuclear cells (n = 21, respectively), we determined cytokine-concentrations (interleukin 2, 4, 6, 10, tumor-necrosis-factor-α, interferon-γ) in supernatants of mixed-lymphocyte-culture and in serum (n = 16) of 20 patients with acute myeloid leukaemia and three patients with myelodysplastic syndromes by cytometric-bead-assay...
April 2015: Cell Communication & Adhesion
Tanya Swaine, Yiqing Tang, Pedro Garcia, Jasmine John, Laura J Waters, Andrew L Lewis
An improved method for evaluating drug release behaviour of drug-eluting embolization beads (DEBs) was developed utilizing an open-loop flow-through system, in which the beads were packed into an occlusive mass within the system and extracted with a flowing elution medium over time. Glass beads were introduced into the beads mass in order to ensure laminar flow, reduce dead volume and improve reproducibility by compensating for swelling phenomena. The effects of glass bead ratio, elution medium flow rate and ion concentration, DEB size and drug concentration and drug type (doxorubicin and irinotecan) were evaluated using DEB composed of a sulfonate-modified polyvinyl alcohol hydrogel (DC Bead™) as the test article...
October 10, 2016: European Journal of Pharmaceutical Sciences
Afsar Raza Naqvi, Jezrom B Fordham, Salvador Nares
Phagocytosis commences with particle internalization and culminates with the activation of innate and adaptive immune responses. However, the role of miRNAs in phagocytosis remains largely unknown. In this study, we examined the role of miR-24, miR-30b and miR-142-3p in Ab Fc receptor (FcR)-mediated phagocytosis by macrophages (MΦ) and dendritic cells (DC). The expression of these miRNAs was reduced following phagocytosis of both IgG-opsonized beads and Escherichia coli, indicating their regulatory role in the process...
October 2016: Innate Immunity
Philippe L Pereira, Stephen Plotkin, Renee Yu, Allison Sutter, Yue Wu, Christof M Sommer, Gregory M Cruise
To compare the mechanical and chemical properties of three commercially available microspheres loaded with irinotecan. LifePearl (200 µm), DC Bead (100-300 µm), and Tandem (100 µm) microspheres were loaded with irinotecan. For loading, elution, and stability determinations, irinotecan concentrations were quantified using validated high-performance liquid chromatography methods. In-vitro elution was performed over 24 h using a USP 4 dissolution apparatus. Diameter measurements were performed using light microscopy...
October 2016: Anti-cancer Drugs
Thierry de Baere, Stephen Plotkin, Renee Yu, Allison Sutter, Yue Wu, Gregory M Cruise
PURPOSE: To compare in vitro properties of 4 drug-eluting embolic agents loaded with doxorubicin. MATERIALS AND METHODS: DC Bead (100-300 µm), LifePearl (200 µm), HepaSphere (30-60 µm), and Tandem (100 µm) microspheres were loaded with 40 mg/20 mL of doxorubicin per milliliter of microspheres. Loading, elution, diameter changes after loading, changes in the amount of doxorubicin loaded over 2 weeks in storage, and time in suspension were evaluated. RESULTS: All microspheres loaded > 99% doxorubicin within 1 hour...
September 2016: Journal of Vascular and Interventional Radiology: JVIR
C-Y Yu, H-Y Ou, C-C Weng, T-L Huang, T-Y Chen, L Leung-Chit, H-W Hsu, C-L Chen, Y-F Cheng
BACKGROUND: The majority of hepatocellular carcinoma (HCC) patients is diagnosed in late stages and therefore becomes ineligible for potentially curative treatment such as resection or liver transplantation. Transarterial chemoembolization (TACE) with drug-eluting beads (DC beads, Biocompatibles, Farnham, United Kingdom) has been proven with less side effects and better efficacy than conventional TACE, especially among patients with poor liver function. PURPOSE: The aim of this study is to evaluate outcomes of HCC patients who received TACE with DC beads, which resulted to eligibility for liver transplantation...
May 2016: Transplantation Proceedings
Solana Alculumbre, Lucia Pattarini
Blood represents the most accessible source of human dendritic cells (DCs). We present here a method to isolate three DC subtypes, as identified until now, from peripheral blood: plasmacytoid dendritic cells (pDCs), CD141(+) myeloid DCs, and CD1c(+) myeloid DCs. The method is based on the sequential depletion of non-DCs. First, depletion of granulocytes, erythrocytes, and platelets is obtained by blood centrifugation over a Ficoll gradient. Then, antibodies recognizing non-DCs, combined with magnetic beads, allow enrichment of DCs from peripheral blood mononuclear cells (PBMCs)...
2016: Methods in Molecular Biology
David Vremec
Dendritic cells (DCs) form a complex network of cells that initiate and orchestrate immune responses against a vast array of pathogenic challenges. Developmentally and functionally distinct DC subtypes differentially regulate T-cell function. Importantly it is the ability of DC to capture and process antigen, whether from pathogens, vaccines, or self-components, and present it to naive T cells that is the key to their ability to initiate an immune response. Our typical isolation procedure for DC from murine spleen was designed to efficiently extract all DC subtypes, without bias and without alteration to their in vivo phenotype, and involves a short collagenase digestion of the tissue, followed by selection for cells of light density and finally negative selection for DC...
2016: Methods in Molecular Biology
Anne-Lise de Lastic, Maria Rodi, Athanasia Mouzaki
T cells play a pivotal role in controlling the immune response and have been the focus of extensive research. We studied the process of in vitro generation of antigen-specific T effector cells (Teffs) to assess the dynamics of antigen presentation and determine the best conditions for cell therapy. We used a peptidic construct consisting of combined HLA class I and II epitopes of the tumor antigen MAGE-3 as an antigen. Monocytes were isolated from healthy donors and were differentiated to dendritic cells (DCs) in vitro...
August 2016: Immunobiology
Alexander J Noll, Ying Yu, Yi Lasanajak, Geralyn Duska-McEwen, Rachael H Buck, David F Smith, Richard D Cummings
Human milk glycans (HMGs) are prebiotics, pathogen receptor decoys and regulators of host physiology and immune responses. Mechanistically, human lectins (glycan-binding proteins, hGBP) expressed by dendritic cells (DCs) are of major interest, as these cells directly contact HMGs. To explore such interactions, we screened many C-type lectins and sialic acid-binding immunoglobulin-like lectins (Siglecs) expressed by DCs for glycan binding on microarrays presenting over 200 HMGs. Unexpectedly, DC-specific intercellular adhesion molecule-3-grabbing non-integrin (DC-SIGN) showed robust binding to many HMGs, whereas other C-type lectins failed to bind, and Siglec-5 and Siglec-9 showed weak binding to a few glycans...
May 15, 2016: Biochemical Journal
Daina Lim, Yuning Lu, Christopher E Rudd
While the cytoskeletal protein talin binds to the β-chain of LFA-1, the immune cell adaptor SKAP1 (SKAP-55) binds to the α-chain of the same integrin via RapL. Whereas calpain protease cleavage of talin is important for LFA-1 activation, it has been unclear whether SKAP1 can alter the function of talin or its associated adaptor RIAM in T-cells. In this paper, we report that Skap1-/- T-cells showed a reduction in the translocation of talin and RIAM to the contact interface of T-cells with antigenic beads or dendritic cells (DCs) presenting OVA peptide to OT-1 T-cells...
April 2016: Immunology Letters
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