【摘要】 目的:分析紫外线(UV)照射对HaCaT角质细胞系线粒体功能及凋亡的影响。方法:以紫外线低剂量(UVA2J/cm2,UVB10mJ/cm2)和高剂量(UVA6J/cm2,UVB30mJ/cm2)照射HaCaT细胞,继续培养15 h,用流式细胞仪检测线粒体膜电位(△ψm)、线粒体质量(mitochondrial mass);使用碘化丙啶(PI)进行DNA染色并用流式细胞仪检测亚二倍体分析凋亡,以及进行Annexin V-FITC与PI共染色,用激光共聚焦显微镜观察细胞凋亡情况。结果:HaCaT细胞经紫外线照射后,△ψm下降的细胞比例随着照射剂量的增加而增加,对照组、低剂量组及高剂量组分别为7.94%±1.02%、25.87%±4.55%、39.27%±5.32%;线粒体质量降低的细胞比例同样随着照射剂量的增加而增加,对照组、低剂量组以及高剂量组分别为15.19%±1.58%、40.36%±4.41%、68.79%±5.46%。用PI检测DNA含量所产生的亚二倍体峰观测凋亡率,对照组、低剂量组以及高剂量组凋亡率分别为1.82%±0.51%、30.16%±5.47%、58.49%±5.98%。用Annexin V-FITC/PI染色分析细胞凋亡程度,其结果与PI-DNA染色所得结果一致,对照组仅有少量细胞死亡,低剂量组凋亡细胞较对照组为多(Annexin V-FITC单阳性细胞),高剂量组以坏死细胞为多(Annexin V-FITC/PI双阳性)。结论:HaCaT细胞经紫外照射后,线粒体去极化作用增强,同时线粒体质量降低,这些变化与细胞凋亡相关。更多还原

【Abstract】 AIM: To study the effects of ultraviolet (UV) on mitochondrial functions and apoptosis in HaCaT cells.METHODS: After irradiation by UV at low dose(UVA 2 J/cm~2,UVB 10 mJ/cm~2) and high dose(UVA 6 J/cm~2,UVB(30 mJ/cm~2),) HaCaT cells were cultured for 15 hours.Flow cytometry was used to measure mitochondrial membrane potential,mitochondrial mass and apoptotic rate.Annexin V-FITC/PI staining of apoptotic cells was analyzed by laser confocal microscopy.RESULTS: After UV irradiation,cell proportion with low mitochondrial membrane potential increased with irradiation doses.The proportion of control group,low dose group and high dose group were 7.94%±1.02%,25.87%±4.55% and 39.27%±5.32%,respectively.Cells proportion with low mitochondrial mass increased with irradiation doses.The proportion of control group,low dose group and high dose group were 15.19%±1.58%,40.36%±4.41% and 68.79%±5.46%,respectively.The hypodiploid peaks of DNA content analysis represented the apoptotic rate of HaCaT cells.The apoptotic rate of control group,low dose group and high dose group were 1.82%±0.51%,30.16%±5.47% and 58.49%±5.98%,respectively.To analyze the cells apoptosis by staining with annexin V-FITC and PI,the results were consistent with those of DNA content analysis.Cells in control group showed almost no positive staining cells.Single annexin V-FITC positive cells in low dose group and double positive cells in high dose group were predominant,respectively.CONCLUSION: UV irradiation induces HaCaT cell mitochondrial depolarization,as well as mitochondrial mass loss.These changes are related to cell apoptosis.更多还原