摘要
Background We asssessed whether the CaNa_2 EDTA could improve the accumulation of protoporphyrin Ⅸ (PpⅨ) and photosensitisation in HEp-2 cells as well as the depth of treatment of skin cancers on the topical 5-Aminolaevulinic acid (5-ALA) PDT.Methods HEp-2 cells were incubated with 5-ALA (0-1mmol/L) and CaNa_2EDTA (0-1mmol/L) for 4 hours,intracellular protoporphyrin Ⅸ content was quantified by extraction,and cell viability was assessed by use of the methyl-tetrazolium (MTT) assay four hours after exposure to light. In comparison with the pictures before and after treatment,depth of treatment could be determined using a Acuson Sequioa 512 phase-array system in paired experiments.Results PpⅨ accumulation increased with increasing extracellular concentrations of ALA (0-1mmol/L). Adding 1mmol/L of CaNa_2EDTA increased 30% PpⅨ accumulation over the same period of incubation in the concentration of 1mmol/L ALA. Significant difference was observed between the 5-ALA alone group and 5-ALA combined CaNa_2 EDTA group in the PpⅨ accumulation ( P <0.01). Cell viability after exposure to light decreased with adding CaNa_2 EDTA,a statistical difference in a same fluence above 1.2 J/cm 2 between two groups was demonstrated ( P <0.05,P <0.01 respectively). Depth of treatment of skin cancers were increased in CaNa_2 EDTA-treated group.conclusion CaNa_2 EDTA could improve the PpⅨ accumulation and photosensitisation in HEp-2 cells. Clinically,CaNa_2 EDTA could increase the depth of treatment in the cutaneous cancers.
Background We asssessed whether the CaNa_2 EDTA could improve the accumulation of protoporphyrin Ⅸ (PpⅨ) and photosensitisation in HEp-2 cells as well as the depth of treatment of skin cancers on the topical 5-Aminolaevulinic acid (5-ALA) PDT.Methods HEp-2 cells were incubated with 5-ALA (0-1mmol/L) and CaNa_2EDTA (0-1mmol/L) for 4 hours,intracellular protoporphyrin Ⅸ content was quantified by extraction,and cell viability was assessed by use of the methyl-tetrazolium (MTT) assay four hours after exposure to light. In comparison with the pictures before and after treatment,depth of treatment could be determined using a Acuson Sequioa 512 phase-array system in paired experiments.Results PpⅨ accumulation increased with increasing extracellular concentrations of ALA (0-1mmol/L). Adding 1mmol/L of CaNa_2EDTA increased 30% PpⅨ accumulation over the same period of incubation in the concentration of 1mmol/L ALA. Significant difference was observed between the 5-ALA alone group and 5-ALA combined CaNa_2 EDTA group in the PpⅨ accumulation ( P <0.01). Cell viability after exposure to light decreased with adding CaNa_2 EDTA,a statistical difference in a same fluence above 1.2 J/cm 2 between two groups was demonstrated ( P <0.05,P <0.01 respectively). Depth of treatment of skin cancers were increased in CaNa_2 EDTA-treated group.conclusion CaNa_2 EDTA could improve the PpⅨ accumulation and photosensitisation in HEp-2 cells. Clinically,CaNa_2 EDTA could increase the depth of treatment in the cutaneous cancers.
