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Kurkumina - od medycyny naturalnej do kliniki

100%
Wolanin K., Piwocka K.
Kosmos
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2008
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vol. 57
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issue 1-2
53-65
EN
Curcumin (diferuloylmethane), a polyphenolic compound derived from turmeric, known as a spice and food-coloring agent, has been used for centuries to treat various illnesses. For the last few decades, extensive work has been done to establish the biological activities and pharmacological actions of curcumin. Curcumin possesses diverse pharmacological activities including anti-inflammatory, antioxidant, antiproliferative, pro-apoptotic and antiangiogenic. It is a well-known chemopreventive agent with potent anticarcinogenic activity in a wide variety of tumor cells. Moreover, it is known for antiarthritic and neuroprotective properties with a big potential role in the treatment of Alzheimer's disease. Curcumin has an outstanding safety profile and its lack of toxicity has been documented in the Phase I and II clinical trials. Although curcumin is poorly absorbed after ingestion and its low systemic bioavailability seems to limit the potential effects, multiple studies have documented that even low levels of physiologically achievable concentrations of curcumin may be sufficient for its chemopreventive and therapeutic activity against various human diseases. Recently, numerous approaches have been undertaken to improve the bioavailability of curcumin. This review summarizes the pleiotropic effects of curcumin and describes the recently identified molecular targets of curcumin.
2
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Effect of aging on UVC-induced apoptosis of rat splenocytes.

71%
Radziszewska E., Piwocka K., Bielak-Żmijewska A., Skierski J., Sikora E.
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2000
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vol. 47
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issue 2
339-347
EN
UVC-induced apoptotic symptoms such as morphological changes, DNA fragmentation, Bcl-2 and Bax protein expression were examined in primary splenocyte cultures from young (3 months) and old (24 months) rats. The activities of AP-1 and CRE transcription factors in UVC-irradiated splenocytes were also assessed. At 24 h after UVC irradiation 40% of cells derived from young rats were found to be apoptotic, which was twice as much as in splenocytes from old rats. Apoptosis in cells from old rats did not give typical symptoms like a "DNA ladder" and Bcl-2 protein downregulation, in contrast to splenocytes from young rats. No AP-1 transcription factor activity was found in UVC-irradiated splenocytes from old animals and only a trace activity in splenocytes from young animals. This indicates that, UVC-induced apoptosis in rat splenocytes is practically AP-1 independent and that cells from old rats are less sensitive to UVC irradiation than splenocytes from young rats.
3
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Curcumin induces cell death without oligonucleosomal DNA fragmentation in quiescent and proliferating human CD8+ cells

61%
Magalska A., Brzezinska A., Bielak-Zmijewska A., Piwocka K., Mosieniak G., Sikora E.
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2006
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vol. 53
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issue 3
531-538
EN
Cytotoxic CD8+ cells play an important role in determining host response to tumor, thus chemotherapy is potentially dangerous as it may lead to T cells depletion. The purpose of this study was to elucidate the propensity of quiescent and proliferating human CD8+ cells to undergo cell death upon treatment with curcumin, a natural dye in Phase I of clinical trials as a prospective chemopreventive agent. Methods: We treated human quiescent or proliferating CD8+ cells with 50 µM curcumin or irradiated them with UVC. Cell death symptoms such as decreased cell viability, chromatin condensation, activation of caspase-3 and specific DFF40/CAD endonuclease and oligonucleosomal DNA fragmentation were analyzed using MTT test, microscopic observation, Western blotting and flow cytometry. Results: Curcumin decreased cell viability, activated caspase-3 and decreased the level of DFF45/ICAD, the inhibitor of the DFF40/CAD endonuclease. However, this did not lead to oligonucleosomal DNA degradation. In contrast, UVC-irradiated proliferating, but not quiescent CD8+ cells revealed molecular and morphological changes characteristic for apoptosis, including oligonucleosomal DNA fragmentation. Curcumin can induce cell death in normal human lymphocytes both quiescent and proliferating, without oligonucleosomal DNA degradation which is considered as a main hallmark of apoptotic cell death. Taking into account the role of CD8+ cells in tumor response, their depletion during chemotherapy could be particularly undesirable.
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