培养的人皮肤成纤维细胞光老化模型中自噬水平的研究

目的 研究人皮肤成纤维细胞的光老化模型中细胞自噬功能的变化。方法 通过UVB多次照射培养的人皮肤成纤维细胞，制作光老化人皮肤成纤维细胞模型，同时设立不用UVB照射的对照组。用β-半乳糖苷酶法测定未照射的对照组及光老化组细胞的老化程度，并分别测定两组细胞的自噬体表达水平。结果 经UVB重复照射后的光老化人皮肤成纤维细胞大多变形、扭曲，部分细胞死亡。光老化组与对照组β-半乳糖苷酶表达阳性细胞的百分率分别为50.60% ± 5.04%、14.58% ± 2.69%，两组间差异有统计学意义（P ＜ 0.01）。光老化组与正常对照组自噬体阳性细胞百分率分别为14.91% ± 4.59%、68.45% ± 8.25%，两组间差异有统计学意义（P ＜ 0.01）。结论 人皮肤成纤维细胞光老化模型形态明显异常，生长基本停滞，老化程度明显高于正常细胞，而自噬水平则明显低于正常对照组细胞。

Autophagy in human skin fibroblast model for photoaging

Objective To observe the changes of autophagy in human skin fibroblast (HSF) model for photoaging. Methods HSF model for photoaging was established through repeated exposure to ultraviolet B (UVB). Those HSFs receiving no irradiation served as the control. The degree of aging was evaluated by p-galactosidase assay, and autophagy level was detected. Results After repeated exposure to UVB, most pho-toaged HSFs were deformed and distorted, and some of them even died. The percentage of P-galactosidase-positive cells was 50.60% ± 5.04% and 14.58% ± 2.69%, respectively in photoaged and control HSFs (P< 0.01). Significant difference was also observed in the proportion of cytophagosome-positive cells between photoaged and control HSFs (14.91% ± 4.59% vs 68.45% ± 8.25%, P < 0.01). Conclusion The HSF model for photoaging shows obviously abnormal appearance and stagnant growth with increased degree of senescence and decreased autophagy compared with normal control HSFs.