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    Wyświetlanie 1-6 z 6
    Tytuł:
    Distinct inhibitory efficiency of siRNAs and DNAzymes to β1 integrin subunit in blocking tumor growth
    Autorzy:
    Wiktorska, Magdalena
    Sacewicz-Hofman, Izabela
    Stasikowska-Kanicka, Olga
    Danilewicz, Marian
    Niewiarowska, Jolanta
    Powiązania:
    https://bibliotekanauki.pl/articles/1039612.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    adhesion
    β1 integrins
    invasiveness
    tumor angiogenesis
    tumor growth
    Opis:
    Receptors of the β1 integrin family are involved in many tumor-promoting activities. There are several approaches currently used to control integrin activity, and thus to potentially restrain tumor metastasis and angiogenesis. In this study, we compared inhibitory efficiencies of siRNA and DNAzymes against the β1 integrin subunit (DEβ1), in a mouse xenograft model. Both inhibitors were used under their most favorable conditions, in terms of concentrations, incubation time and lack of cytotoxic effects. Transfection of siRNAβ1 or DEβ1 remarkably inhibited the growth of both PC3 and HT29 colon cancer cells in vitro, and decreased their capability of initiating tumor formation in the mouse xenograft model. siRNAβ1 appeared to be slightly more efficient than DEβ1 when tested in vitro, however it was comparably less proficient in blocking the tumor growth in vivo. We conclude the DNAzyme, due to its greater resistance to degradation in extra- and intracellular compartments, to be a superior inhibitor of tumor growth in long lasting experiments in vivo when compared to siRNA, while the latter seems to be more efficient in blocking β1 expression during in vitro experiments using cell cultures.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 1; 77-82
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The scheduling of angiogenic inhibitors minimizing tumor volume
    Autorzy:
    Ledzewiecz, U.
    Marriott, J.
    Maurer, H.
    Schättler, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/332886.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    modelowanie biomatematyczne
    kontrola optymalna
    sterowanie optymalne
    guz antyangiogenny
    uzyskiwanie protokołów
    biomathematical modelling
    optimal control
    tumor anti-angiogenesis
    realizable protocols
    Opis:
    The efficiency of piecewise constant protocols with a small number of switchings is investigated for a mathematical model of tumor anti-angiogenesis formulated originally by Hahnfeldt et al. in [8]. By comparing with the theoretically optimal solution derived earlier [12] it will be seen that for the problem of minimizing the primary cancer volume with a given amount of angiogenic inhibitors to be administered constant protocols already provide very good suboptimal strategies.
    Źródło:
    Journal of Medical Informatics & Technologies; 2008, 12; 23-28
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GPU enhanced simulation of angiogenesis
    Autorzy:
    Worecki, M.
    Wcisło, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/305573.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    GPU
    angiogenesis
    tumor
    Opis:
    In the paper we present the use of graphic processor units to accelerate the most time-consuming stages of a simulation of angiogenesis and tumor growth. By the use of advanced CUDA mechanisms such as shared memory, textures and atomic operations, we managed to speed up the CUDA kernels by a factor of 57x. However, in our simulation we used the GPU as a co-processor and data from CPU was copied back and forth in each phase. It decreased the speedup of rewritten stages by 40%. We showed that the performance of the entire simulation can be improved by a factor of 10 up to 20.
    Źródło:
    Computer Science; 2012, 13 (1); 35-48
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MRI image analysis in patients with a tumor of the central nervous system : an attempt of developing a management algorithm
    Analiza obrazu MRI u chorych z guzem ośrodkowego układu nerwowego : próba opracowania algorytmu postępowania
    Autorzy:
    Śniegocki, M.
    Nowacka, A.
    Fisz, J.
    Śniegocka, A.
    Buczkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/389840.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
    Tematy:
    tumor
    MRI image
    angiogenesis
    image analysis
    Opis:
    Magnetic resonance imaging study is currently the reference method for the detection and diagnosis of the central nervous system tumors. A large number of tumors, especially high-grade, has a higher water content in the cells, which results in prolongation of MRI T1 and T2 what appearance as increased signal intensity in in T2-weighted images and the reduction in T1-weighted images. MRI can be performed with administration of contrast agent, which shortens T1 and increases signal on T1-weighted sequences. This allows to identify areas of increased angiogenesis), which is the exponent of the cancer malignancy degree and its biological activity. Obtained MRI images are analyzed and evaluated by a radiologist and a clinician. Most of the time it is the "by the eye" analysis, which is based on the MRI image evaluation by the generally accepted radiological standards. However, this method is relatively inaccurate. which in turn can bring to the wrong diagnosis of the disease and implementation or even lack of implementation of appropriate treatment. More and more researches are conducted in this area, but developed methods are usually very complicated and difficult to carry out by the "layman" which is the clinician. That is why the attempt is made, to develop a simple and clear algorithm for MRI image analysis in patients with the central nervous system tumors, allowing for quick and objective evaluation of magnetic resonance imaging study.
    Badanie metodą rezonansu magnetycznego jest aktualnie metodą referencyjną przy wykrywaniu i diagnozowaniu nowotworów centralnego układu nerwowego. Duża część nowotworów, zwłaszcza o wysokim stopniu złośliwości, charakteryzuje się większą zawartością wody w komórkach, co w badaniu MRI skutkuje wydłużeniem T1 i T2, uwidocznionym jako nasilenie sygnału w obrazach T2-zależnych oraz jego obniżeniem w obrazach T1-zależnych. MRI można przeprowadzić z podaniem środka kontrastowego, co powoduje skrócenie czasu T1 i podniesienie
    Źródło:
    Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy; 2011, 15; 49-61
    1899-0088
    Pojawia się w:
    Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined delivery of an antiangiogenic protein (angiostatin) and an immunomodulatory gene (interleukin-12) in the treatment of murine cancer.
    Autorzy:
    Wilczyńska, Urszula
    Kucharska, Anna
    Szary, Jarosław
    Szala, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1044050.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    angiogenesis
    IL-12 gene
    tumor gene therapy
    angiostatin
    Opis:
    We investigated the feasibility of a novel therapeutic approach to treat neoplastic diseases in mice. This novel strategy consists in delivering a protein (angiostatin) with strong antiangiogenic properties, followed by administration of the interleukin 12 gene that is strongly immunomodulatory and has also some antiangiogenic effects. When angiostatin-mediated antiangiogenic therapy was used in combination with intratumor delivery of the IL-12 gene (a strategy much safer than IL-12 protein administration), this produced a synergistic therapeutic effect.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 4; 1077-1084
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anticancer Activities of Ferrous and Ferric Ions in Progression, Proliferation, Angiogenesis, Invasion and Metastasis against Cancer and Tumor Cells
    Autorzy:
    Ishida, Tsuneo
    Powiązania:
    https://bibliotekanauki.pl/articles/1112780.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Angiogenesis
    Cancer and tumor cell death
    Ferritin
    Ferroptosis
    Ferrous and ferric ions
    Invasion and metastasis
    Iron deficiency and overload
    ROS
    Opis:
    The process of ferroptotic death is characterized by the overwhelming, iron-depending accumulation of lethal lipid ROS. Unlike other forms of apoptotic and non-apoptotic death, this requirement for ROS accumulation appears to be universal. Redox cycling is a characteristic of transition metals such as iron (Ferritin Fe3+ ⇄ Ferrous Fe2+). Iron via the Fenton reaction can exacerbate the consequences of hydrogen peroxide (H2O2) production, leading to the generation of hydroxyl radicals. The superoxide ion can participate in regenerating ferrous iron that is required for the Fenton reaction. An excess of iron is toxic due to its ability to engage in redox cycling and promote free radical formation. Super oxide anion generation; O2 → ･O2－. Hydrogen peroxide production; ･O2－ + 2H+ + e- → H2O2. Haber-Weiss reaction; H2O2 + O2－ → ･OH + OH－ + O2. Fenton reaction; Fe2+ + H2O2 → Fe3+ + OH－ + ･OH. Reduction to Fe(Ⅱ); Fe3+ ＋ ･O2－ → Fe2+ + O2. Ferritin is stable in iron-rich conditions, whereas it is rapidly degraded under conditions of iron starvation and ferritin degradation can be led. New blood vessel formation in angiogenesis is fundamental to tumor growth, invasion, and metastatic dissemination. Iron deficiency will lead to the dysfunction of immune system, metabolic disorders, myasthenia and anemia, whereas, excess iron also damages several vital organs. Thus, iron is essential for multiple cell functions, but is also potentially deleterious reasons of its ability to generate free oxygen radicals, iron balance by continuously recycling and reusing cellular iron, storage in ferritin, and export through ferroportin protecting cells from free iron toxicity. However. the exact molecular mechanism involved on iron imbalance in development for tumor cells and the iron overload-mediated induction of apoptosis are required to be explored in future.
    Źródło:
    World News of Natural Sciences; 2018, 17; 111-129
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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