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    Wyświetlanie 1-7 z 7
    Tytuł:
    c-myc Oncogene gene dosage, serum CEA and CA-15.3 antigen levels, and cellular DNA values in relation to ex vivo chemosensitivity of primary human breast cancer.
    Autorzy:
    Falkiewicz, Bogdan
    Schlotter, Claus
    Bosse, Ulrich
    Bielawski, Krzysztof
    Vogt, Ulf
    Powiązania:
    https://bibliotekanauki.pl/articles/1044409.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cultured tumor cells
    antitumor drug screening assays
    oncogenes
    antineoplastic agents
    drug resistance
    breast cancer
    Opis:
    A pilot study on relationships of selected molecular factors (c-myc oncogene average gene copy numbers (AGCN); serum CEA and CA 15.3 antigen levels; tumor cells' DNA values), to the ex vivo chemosensitivity of primary female human breast cancer in a modified adenosine triphosphate cell viability chemosensitivity assay (ATP-CVA), was performed. Four drug combinations were tested. A group of 75 cases of female primary breast cancer was assessed. Numerous correlations were found among molecular factors tested but none, with the exception of tumor grading, of these reflected ex vivo chemosensitivity of tumors tested. The results suggest that the parameters tested may not be important factors related to adjuvant chemoresponsiveness of primary human breast cancer to tested drug combinations.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 1; 149-156
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative effects of selected plant polyphenols, gallic acid and epigallocatechin gallate, on matrix metalloproteinases activity in multidrug resistant MCF7/DOX breast cancer cells
    Autorzy:
    Nowakowska, Anna
    Tarasiuk, Jolanta
    Powiązania:
    https://bibliotekanauki.pl/articles/1038784.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    phenolic compounds
    gallic acid
    epigallocatechin gallate
    matrix metalloproteinases
    human breast cancer MCF7 cells
    multidrug resistance MDR
    Opis:
    The aim of the study was to investigate the effect of selected polyphenols: gallic acid (GA) and epigallocatechin gallate (EGCG) on matrix metalloproteinase (MMP-2 and MMP-9) activity in multidrug resistant (MDR) human breast adenocarcinoma cells: MCF7/DOX cells and obtained recently in our laboratory MCF7/DOX500 cells by the permanent selection of MCF7/DOX cells with 500 nM doxorubicin (DOX). The activity of MMP-2 and MMP-9 and the effect of studied polyphenols on these matrix proteases were examined by gelatin zymography assays. We have found that the activity of MMP-2 and MMP-9 significantly increased in resistant MCF7/DOX and MCF7/DOX500 cells whereas they were not detected in sensitive MCF7 cells. It was also observed that GA (30, 60, 100 and 120 µM) and EGCG (5, 10 and 20 µM) caused a comparable concentration-dependent inhibition of MMP-2 and MMP-9 activity in MCF7/DOX and MCF7/DOX500 cells. Control experiments confirmed that examined compounds in these ranges of concentration did not affect the cell growth of MCF7/DOX and MCF7/DOX500 sublines (80-100% of control cell growth was observed in the presence of studied polyphenols).
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 3; 571-575
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cytotoxic and apoptosis inducing effect of some pyrano [3, 2-c] pyridine derivatives against MCF-7 breast cancer cells
    Autorzy:
    Rahnamay, Mohammad
    Mahdavi, Majid
    Shekarchi, Ali
    Zare, Payman
    Hosseinpour Feizi, Mohammad
    Powiązania:
    https://bibliotekanauki.pl/articles/1038367.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    apoptosis
    pyrano-pyridine
    breast cancer
    MCF-7 cells
    Opis:
    Anti-cancer activities of some pyrano-pyridines have been previously reported. Herein, we investigated anti-proliferative and apoptotic effects of the novel pyrano [3, 2-c] pyridine (P.P, TPM.P, 4-CP.P and 3-NP.P) compounds against MCF-7 breast cancer cells. The MCF-7 cells were cultured in the presence of various concentrations (20-200 μM) of the tested compounds for 3 days and the cell viability was determined by MTT assay. Induction of apoptosis was qualitatively assayed by acridine orange/ethidium bromide (AO/EtBr) staining, DNA fragmentation assay, as well as quantitatively by Annexin V/PI double staining and cell cycle analysis. These compounds inhibited growth and proliferation of the MCF-7 cells in a dose- and time-dependent manner. The IC50 values of P.P, TPM.P, 4-CP.P and 3-NP.P after 24 h of exposure were calculated to be 100±5.0, 180±6.0, 60±4.0 and 140±5.0 μM, respectively. 4-CP.P was determined as the most potent compound and was chosen for further studies. The result of flow cytometric cell cycle analysis indicated an increase in sub-G1 population after 72 h treatment of the cells. Furthermore, this was accompanied by exposure of phosphatidylserine (PS) in the outer cell membrane after time course of treatment with the 4-CP.P. Based on these observations, the pyrano [3, 2-c] pyridines can be regarded as a valuable candidate for further pharmaceutical evaluations.
    Źródło:
    Acta Biochimica Polonica; 2018, 65, 3; 397-402
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of circulating tumour cells in the breast cancer using CytoTrack system
    Autorzy:
    Bogacz, A.
    Wolek, M.
    Górska, A.
    Leporowska, E.
    Procyk, D.
    Kolenda, P.
    Litwiniuk, M.
    Uzar, I.
    Gryszczyńska, A.
    Łowicki, Z.
    Czerny, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048955.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    circulating tumour cells
    breast cancer
    CytoTrack CT11
    liquid biopsy
    wolnokrążące komórki nowotworowe
    rak piersi
    CytroTrack CT11
    płynna biopsja
    Opis:
    Introduction: Plants are a rich source of healing substances. Cancer is a leading cause of death worldwide while breast cancer is the most common cancer among women. Circulating tumour cells (CTCs) are potential founder cells for metastasis. Therefore, their assessment may be used for monitoring of treatment as well as detecting cancer metastatis. Hence, it is suggested that the number of CTCs may be a valuable tumour biomarker during therapy. Objective: The purpose of this study was to detect CTCs in breast cancer and to validate the method of assessment of CTC count using CytoTrack CT11 technology. Methods: MCF-7 cells were sorted by a FACSARIA flow cytometer from blood samples derived from patients who have not been diagnosed with cancer. Identification and quantitative assessment of MCF-7 cells in blood samples were determined by flow sorting. Then, blood samples containing MCF-7 cells or without MCF-7 were scanned with the use of an automated fluorescence scanning microscope. Results: In in vitro model analysing the glass CytoDisc™ with stained MCF-7 cells, we noted the correlation between the amount of observed tumour cells and expected number of tumour cells. Moreover, coefficient of variation in case of the recovery rate of the assumed number of MCF-7 cells was 30%, 17%, 18% and 15%, respectively. Conclusion: Our study suggest that CTCs could be predictive factor in patients with metastatic cancer especially in breast cancer.
    Źródło:
    Herba Polonica; 2019, 65, 4; 31-36
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth suppression of human breast carcinoma stem cells by lipid peroxidation product 4-hydroxy-2-nonenal and hydroxyl radical-modified collagen
    Autorzy:
    Cipak, Ana
    Mrakovcic, Lidija
    Ciz, Milan
    Lojek, Antonin
    Mihaylova, Boryana
    Goshev, Ivan
    Jaganjac, Morana
    Cindric, Marina
    Sitic, Sanda
    Margaritoni, Marko
    Waeg, Georg
    Balic, Marija
    Zarkovic, Neven
    Powiązania:
    https://bibliotekanauki.pl/articles/1040399.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    collagen
    4-hydroxynonenal
    breast cancer stem cells
    extracellular matrix
    oxidative homeostasis
    SUM159
    Opis:
    Breast cancer is a leading cause of mortality and morbidity in women, mostly due to high metastatic capacity of mammary carcinoma cells. It has been revealed recently that metastases of breast cancer comprise a fraction of specific stem-like cells, denoted as cancer stem cells (CSCs). Breast CSCs, expressing specific surface markers CD44+CD24-/lowESA+ usually disseminate in the bone marrow, being able to spread further and cause late metastases. The fundamental factor influencing the growth of CSCs is the microenvironment, especially the interaction of CSCs with extracellular matrix (ECM). The structure and function of ECM proteins, such as the dominating ECM protein collagen, is influenced not only by cancer cells but also by various cancer treatments. Since surgery, radio and chemotherapy are associated with oxidative stress we analyzed the growth of breast cancer CD44+CD24-/lowESA+ cell line SUM159 cultured on collagen matrix in vitro, using either native collagen or the one modified by hydroxyl radical. While native collagen supported the growth of CSCs, oxidatively modified one was not supportive. The SUM159 cell cultures were further exposed to a supraphysiological (35 µM) dose of the major bioactive lipid peroxidation product 4-hydroxynonenal (HNE), a well known as 'second messenger of free radicals', which has a strong affinity to bind to proteins and acts as a cytotoxic or as growth regulating signaling molecule. Native collagen, but not oxidised, abolished cytotoxicity of HNE, while oxidized collagen did not reduce cytotoxicity of HNE at all. These preliminary findings indicate that beside direct cytotoxic effects of anticancer therapies consequential oxidative stress and lipid peroxidation modify the microenvironment of CSCs influencing oxidative homeostasis that could additionally act against cancer.
    Źródło:
    Acta Biochimica Polonica; 2010, 57, 2; 165-171
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of Topotecan on oxidative stress in MCF-7 human breast cancer cell line
    Autorzy:
    Timur, Mujgan
    Akbas, S
    Ozben, Tomris
    Powiązania:
    https://bibliotekanauki.pl/articles/1041340.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    MCF-7 cells
    Topotecan
    antioxidants
    breast cancer
    oxidative stress
    Opis:
    Purpose. Topotecan, a semisynthetic water-soluble derivative of camptothecin exerts its cytotoxic effect by inhibiting topoisomerase I and causes double-strand DNA breaks which inhibit DNA function and ultimately lead to cell death. In previous studies it was shown that camptothecin causes ROS formation. The aim of this study was to investigate if Topotecan like camptotecin causes oxidative stress in MCF-7 human breast cancer cell line. Determining the oxidant effect of Topotecan may elucidate a possible alternative mechanism for its cytotoxicity. Experimental design. MCF-7 cells were cultured and exposed to Topotecan for 24 h at 37°C. The viability of the cells (% of control) was measured using the colorimetric 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. Lipid peroxidation (TBARS), protein oxidation (carbonyl content), sulfhydryl, glutathione (GSH) levels, superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) activities were determined in MCF-7 cells with and without Topotecan incubation. Results. We found the IC50 concentration of Topotecan as 0.218 µM in MCF-7 cells. This concentration of Topotecan was used in the incubations of the cells. Our data indicated increased oxidative status, as revealed by increased lipid peroxidation and protein oxidation, and decreased GSH and sulfhydryl levels in MCF-7 cells exposed to Topotecan compared to control cells. In contrast, there was a slight increase in SOD and a significant increase in GPx and catalase activity in MCF-7 cells incubated with Topotecan compared to the control. Conclusions. These results support our hypothesis that Topotecan increases oxidative stress in MCF-7 cells.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 4; 897-902
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trastuzumab Efficacy Quantified by Fluorine-19 Magnetic Resonance Imaging
    Autorzy:
    Bartusik-Aebisher, Dorota
    Aebisher, David
    Czmil, Mrs Anna
    Mazur, Damian
    Powiązania:
    https://bibliotekanauki.pl/articles/895489.pdf
    Data publikacji:
    2020-06-29
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    trastuzumab
    magnetic resonance imaging
    breast cancer cells
    three-dimensional cell culture
    Trastuzumab conjugates
    Opis:
    The purpose of this study was to conjugate Trastuzumab with fluorine-bearing PAMAM dendrimer to compare activities in three-dimensional (3D) cultured breast cancer cells with parent Trastuzumab. An in vitro study was performed to determine cellular responses to fluorinated Trastuzumab conjugates by Magnetic Resonance Imaging (MRI). Breast cancer cells were cultured in 3D geometry. Proton (1H) MRI and Fluorine-19 (19F) MRI were used for visualization of cellular locations within a Hollow Fiber Bioreactor (HFBR) device and to monitor the cellular response to treatment. The results of this study confirm that cell growth is significantly decreased following treatment with Trastuzumab conjugates. The use of fluorinated Trastuzumab conjugates decreases breast cancer cell growth in 3D cultures and allows for tracking of drug delivery to cancer cells via 19F.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 3; 495-503
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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