A comparative study on the enhancement efficacy of specific and non-specific iron chelators for protoporphyrin IX production and photosensitization in HaCat cells |
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Authors: | Yumin Xia Yingying Huang Longde Lin Xiaoming Liu Shan Jiang Layuan Xiong |
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Institution: | 1. Department of Dermatology,Renmin Hospital of Wuhan University,Wuhan 430060,China 2. Aesthetic and Plastic Center of Guangxi Medical University,Nanning 530007,China;Wellman Center for Photomedicine,Massachusetts General Hospital,Harvard Medical School,Boston 02114,USA 3. School of Public Health,Guangxi Medical University,Nanning 530027,China |
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Abstract: | The iron chelators can be utilized in target cells to improve 5-aminolaevulinic acid (ALA)-based photodynamic therapy (PDT).
The purpose of this study is to compare the effect of two kinds of iron chelators, desferrioxamine (DFO) and ethylenediaminetetraacetic
acid (EDTA) on the enhancement of ALA-PDT. HaCat cells were cultured in medium containing 2.0 mmol/L of ALA and 0.5 mmol/L
of DFO or EDTA. After 3-h incubation in the dark, the concentration of cellular protoporphyrin IX (PpIX) was detected by high
performance liquid chromatography (HPLC), and the fluorescence of PpIX was observed at 630 nm emission under confocal laser
scanning microscope. For PDT, HaCat cells were irradiated using 632.8 nm laser, and the fractions of apoptotic and necrotic
cells were flow cytometrically assayed. Related differences in morphology and ultrastructure of Ha-Cat cells were observed
using optical microscope or transmission electron microscope. Compared to incubation with ALA alone, the addition of DFO or
EDTA increased the concentration of cellular PpIX and the fluorescent density of PpIX, and also increased cell death ratio
after PDT. PDT using ALA plus DFO produced the highest cellular PpIX level, greatest cell death ratio and most severe structural
damage to the cells. It was concluded that both DFO and EDTA could enhance ALA-based PpIX production and PDT. Compared to
the non-specific iron chelator of EDTA, the specific chelator, DFO, showed more potential for the enhancement. |
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Keywords: | aminolaevulinic acid desferrioxamine ethylenediaminetetraacetic acid keratinocytes photodynamic therapy protoporphyrin IX |
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