摘要
目的 探讨组织蛋白酶B（CatB）在急性光损伤人皮肤成纤维细胞（HDF）中的表达变化及意义.方法 体外培养原代HDF,选取第4～8代细胞进行实验.实验设长波紫外线（UVA）照射组和不照射的对照组.CCK8法分别检测5、10、15、20和25 J/cm2 UVA照射后HDF的增殖率.用10 J/cm2 UVA单次照射致HDF急性光损伤,Western印迹及实时定量逆转录（RT）-PCR分别检测急性光损伤组HDF及对照组HDF照射后24、48、72 h CatB蛋白及mRNA表达;另外分别用10、15、20、25 J/cm2 UVA照射HDF,Western印迹及实时定量RT-PCR分别检测急性光损伤组及对照组HDF照射后48 h CatB蛋白及基因表达.数据采用SPSS 13.0统计软件行方差分析,两组间比较采用最小显著差异法（LSD）.结果 UVA照射导致HDF增殖率下降;当UVA剂量≤10 J/cm2时,细胞存活率均保持在85％以上,各照光组分别与对照组24、48、72 h时比较,均P＜0.05.Western印迹结果显示,急性光损伤组（10 J/cm2 UVA照射）CatB蛋白灰度值在照射后24 h（0.76±0.14）、48 h（1.34±0.38）、72 h（0.82±0.09）均较对照组（分别为0.35±0.01、0.45±0.12、0.61±0.06）升高（均P＜0.05）.实时定量RT-PCR显示,在急性光损伤组CatB的mRNA表达在照射后24 h（0.149±0.009）、48 h（0.173±0.009）、72 h（0.185±0.158）也较对照组（分别为0.089±0.015、0.091±0.010、0.111±0.017）上调（均P＜0.05）.10、15、20、25 J/cm2 UVA照射HDF后48 h,CatB的蛋白灰度值分别为0.99±0.07、1.49±0.14、1.89±0.08、2.07±0.06,均较对照组（0.60±0.05）升高（均P＜0.05）,CatB的mRNA表达也较对照组升高.结论 UVA致急性光损伤的皮肤成纤维细胞中CatB蛋白及mRNA表达均上调.
Objective To investigate the changes in cathepsin B （CatB） expression in acutely photodamaged human dermal fibroblasts （HDFs） and their significance.Methods HDFs were isolated from the foreskin of children,and subjected to primary culture and subculture.The fourth-to eighth-passage HDFs were used in the following experiment.HDFs were divided into two groups to receive irradiation with different doses of ultraviolet A （UVA） for different durations （acutely photodamaged group） or remain unirradiated （control group）.Cell counting kit-8 （CCK8） assay was conducted to evaluate the proliferative activity of HDFs after irradiation with UVA at 5,10,15,20 and 25 J/cm2 respectively.Western blot and quantitative real-time reverse transcription PCR were performed to measure the protein and mRNA expressions of CatB respectively in HDFs at 24,48 and 72 hours after exposure to UVA at 10 J/cm2,and at 48 hours after exposure to UVA at 10,15,20 and 25 J/cm2.Statistical analysis was carried out by analysis of variance and least significant difference （LSD） test using the SPSS 13.0 software.Results UVA radiation induced a decrease in the proliferative activity of HDFs.When the dose of UVA was ≤ 10 J/cm2,the survival rate of HDFs maintained higher than 85%,and significant differences were observed in cell survival rate between unirradiated and irradiated HDFs at 24,48 and 72 hours （all P 〈 0.05）.Western blot showed that the gray value of CatB protein in the acutely photodamaged group irradiated with 10 J/cm2 UVA was significantly higher than that in the control group at 24 hours （0.76 ± 0.14 vs.0.35 ± 0.01,P 〈 0.05）,48 hours （1.34 ± 0.38 vs.0.45 ± 0.12,P〈 0.05） and 72 hours （0.82 ± 0.09 vs.0.61 ± 0.06,P〈 0.05）.Increased mRNA expressions of CatB were also observed in the acutely photodamaged group compared with the control group at 24 hours （0.149 ± 0.009 vs.0.089 ± 0.015,P 〈 0.05）,48 hous （0.173 ± 0.009 vs.0.091 ± 0.010,P 〈 0.05） and 72 hours （0.185 ± 0.158 vs.0.111 ± 0.017,P 〈 0.05） after UVA radiation at 10 J/cm2.The gray value of CatB protein was 0.99 ± 0.07,1.49 ± 0.14,1.89 ± 0.08,2.07 ± 0.06 in HDFs at 48 hours after exposure to UVA of 10,15,20 and 25 J/cm2,respectively,significantly higher than that in the control group （0.60 ± 0.05,all P 〈 0.05）.Similarly,the mRNA expression of CatB was up-regulated in HDFs at 48 hours after UVA radiation at 10,15,20 and 25 J/cm2 compared with the unirradiated HDFs.Conclusion The protein and mRNA expressions of CatB are up-regulated in acutely photodamaged HDFs induced by UVA radiation.
出处
《中华皮肤科杂志》
CAS
CSCD
北大核心
2014年第11期776-779,共4页
Chinese Journal of Dermatology
基金
国家自然科学基金（81171523）
广东省自然科学基金（10151008901000117）
