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Immunological features of photodynamic therapy
Języki publikacji
Abstrakty
Terapia fotodynamiczna (photodynamic therapy - PDT) jest metodą leczenia wybranych (przede wszystkim wczesnych) nowotworów i stanów przednowotworowych. Istotą tej metody jest selektywne niszczenie zmienionych chorobowo tkanek poprzez zadziałanie na nie światła laserowego o ściśle określonej długości fali. Zjawisko to umożliwia substancja - fotouczulacz, wychwytywana przez chorobowo zmienioną tkankę. Standardowo stosowanymi fouczulaczami są porfiryny, które są komponentą hemoglobiny. Działanie fotodynamiczne wywołuje trzy typy reakcji w naświetlanej tkance: bezpośredni efekt cytotoksyczny, pośredni efekt cytotoksyczny przez okluzję naczyń krwionośnych oraz wtórne działanie immunostymulujące i prozapalne. Spośród wymienionych sposobów działania, efekt immunostymulujący wydaje się być unikalny, zważywszy, że zarówno chemio- jak i radioterapia powodują upośledzenie funkcji układu immunologicznego. Wiele prac doświadczalnych wykazało, iż w trakcie terapii fotodynamicznej dochodzi do mobilizacji komórek immunokompetentnych: nacieku limfocytów, neutrofili, makrofagów, co wskazuje na aktywację procesu zapalnego. Mediatorami tego procesu są substancje wazoaktywne, składniki C3 dopełniacza, białka ostrej fazy, proteinazy, peroksydazy, reaktywne formy tlenu, cytokiny, czynniki wzrostu oraz inne substancje biorące udział w odpowiedzi immunologicznej. Podkreśla się, iż immunomodulacyjny efekt terapii fotodynamicznej związany jest także z wpływem na angiogenezę i aktywność metastatyczną komórek nowotworowych.
Photodynamic therapy (PDT) is a well-known method for the selective, non-invasive and effective treatment of precancerous and cancerous lesions due to the activation of photobiochemical processes that cause cytotoxicity. PDT is based on mutual reactions between laser irradiation and photosensitizers that accumulate in tissues and result in selective damage of pathological tissues. The anticancer effect of PDT is due to three main mechanisms. First, PDT is cytotoxic, with both necrotic and apoptotic effects. Second, PDT leads to the occlusion of blood and lymphatic vessels of the tumor. Third, PDT is associated with the modulation of immune and inflammatory responses. In addition to these mechanisms of cell death, there is a variety of events that occur during PDT that lead to and magnify the inactivation of tumor cells. Many studies have reported the infiltration of lymphocytes, neutrophils and macrophages into PDT-treated tissue, indicating activation of the immune response. The inflammatory process is mediated by factors such as vasoactive substances, components of the complement and clotting cascades, acute phase proteins, proteinases, peroxidases, reactive oxygen species, leukocyte chemoattractants, cytokines, growth factors and other immunoregulators. It is possible that immunomodulatory mechanisms of PDT could also influence angiogenesis and the invasiveness of tumor cells.
Czasopismo
Rocznik
Tom
Strony
284--290
Opis fizyczny
Bibliogr. 32 poz.
Twórcy
autor
autor
autor
autor
autor
autor
autor
- Ośrodek Diagnostyki i Terapii Laserowej, Katedra i Klinika Chorób Wewnętrznych, Angiologii i Medycyny Fizykalnej, Śląski Uniwersytet Medyczny
Bibliografia
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- [24] Hamblin M.R, Tegos G.P.: New Approaches to Microbial Photoinactivation. 11th World Congress of the International Photodynamic Association. Congress Program and Abstracts. Session 16-1. Shanghai 2007.
- [25] Tang H.M, Yow C.M.N., Wong C.K.: Mechanism of Photoinactivation of Hypericin on Methicillin-Resistant Staphylococcus Aureus (MRSA) in Hong Kong 11th World Congress of the International Photodynamic Association. Congress Program and Abstracts. Session 16-P1. Shanghai 2007.
- [26] Chung-Ku R., So-Young C, Jin-Chul A. i wsp:: Antibacterial Effect of PDT Using the Photogem on Helicobacter Pylroi 2669511th World Congress of the International Photodynamic Association. Congress Program and Abstracts. Session 16-P4. Shanghai 2007.
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- [28] Takanorilriuchishima T., Saito A., Shin Aizawa S. i wsp.: The Effect of Photodynamic Therapy Using Na-Pheophorbide A on the Normal Joint Tissue of Mice 11th World Congress of the International Photodynamic Association. Congress Program and Abstracts. Session 16-P7. Shanghai 2007.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BAR8-0009-0102