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, desfe...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 pro-toporphyrin 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.展开更多
为了探索除草剂Tiafenacil在防治农业杂草方面的应用前景,以3-氨基-4,4,4-三氟丁烯酸乙酯为原料,经6步反应制备得到Tiafenacil,其结构经1H NMR和ESI-MS确证,并对Tiafenacil进行除草活性测定。结果表明:Tiafenacil在苗前浓度为300 g a.i....为了探索除草剂Tiafenacil在防治农业杂草方面的应用前景,以3-氨基-4,4,4-三氟丁烯酸乙酯为原料,经6步反应制备得到Tiafenacil,其结构经1H NMR和ESI-MS确证,并对Tiafenacil进行除草活性测定。结果表明:Tiafenacil在苗前浓度为300 g a.i.·hm^(-2)条件下,其对稗草、苘麻的除草活性均优于对照药剂97%莠去津原药;在苗前浓度为75 g a.i.·hm^(-2)条件下,其对稗草、苘麻的除草活性均优于对照药剂97%氟磺胺草醚原药。苗后浓度为37.5、75、150、300 g a.i.·hm^(-2)条件下,其对稗草、金色狗尾草、百日草、苘麻的除草活性均可达100%,明显优于对照药剂97%氟磺胺草醚原药和97%莠去津原药。展开更多
文摘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 pro-toporphyrin 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.
文摘为了探索除草剂Tiafenacil在防治农业杂草方面的应用前景,以3-氨基-4,4,4-三氟丁烯酸乙酯为原料,经6步反应制备得到Tiafenacil,其结构经1H NMR和ESI-MS确证,并对Tiafenacil进行除草活性测定。结果表明:Tiafenacil在苗前浓度为300 g a.i.·hm^(-2)条件下,其对稗草、苘麻的除草活性均优于对照药剂97%莠去津原药;在苗前浓度为75 g a.i.·hm^(-2)条件下,其对稗草、苘麻的除草活性均优于对照药剂97%氟磺胺草醚原药。苗后浓度为37.5、75、150、300 g a.i.·hm^(-2)条件下,其对稗草、金色狗尾草、百日草、苘麻的除草活性均可达100%,明显优于对照药剂97%氟磺胺草醚原药和97%莠去津原药。
