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1.400016 重庆,重庆医科大学:附属第一医院皮肤科
2.400016 重庆,重庆医科大学:中医药学院
[ 陈爱军,E-mail:1360999716@qq.com CHEN Aijun, E-mail:1360999716@qq.com
收稿:2019-03-25,
修回:2019-05-30,
纸质出版:2019-09-15
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刘川, 黄欣, 王萍, 等. 皮肤角质形成细胞光老化模型的构建及老化机制的初步研究[J]. 第三军医大学学报, 2019,41(17):1649-1655.
Chuan LIU, Xin HUANG, Ping WANG, et al. Establishment of skin photoaging model and preliminary mechanism of senescence in keratinocytes cell line HaCaT[J]. Journal of Third Military Medical University, 2019, 41(17): 1649-1655.
刘川, 黄欣, 王萍, 等. 皮肤角质形成细胞光老化模型的构建及老化机制的初步研究[J]. 第三军医大学学报, 2019,41(17):1649-1655. DOI: 10.16016/j.1000-5404.201903210.
Chuan LIU, Xin HUANG, Ping WANG, et al. Establishment of skin photoaging model and preliminary mechanism of senescence in keratinocytes cell line HaCaT[J]. Journal of Third Military Medical University, 2019, 41(17): 1649-1655. DOI: 10.16016/j.1000-5404.201903210.
目的
2
建立有效的皮肤光老化HaCaT细胞模型,初步探索可能涉及的老化相关信号转导途径。
方法
2
以3
0 mJ/cm
2
中波紫外线(ultraviolet B,UVB)辐照HaCaT细胞,采用CCK-8检测细胞增殖能力,流式细胞仪分析细胞周期,衰老相关β-半乳糖苷酶(SA-β-gal)染色分析各组阳性细胞百分比,qRT-PCR和Western blot检测衰老相关蛋白p53、p21和p16的表达,细胞免疫荧光检测p21蛋白胞内定位。
结果
2
30 mJ/cm
2
UVB辐照后,HaCaT细胞增殖率均较对照组降低(
P
<
0.01),G
2
期细胞比例较对照组增加(
P
<
0.05),细胞SA-β-gal染色阳性率明显高于对照组(
P
<
0.01)。qRT-PCR和Western blot检测结果均显示:辐照后,HaCaT细胞中p53、p16表达明显升高,p21表达明显下降(
P
<
0.05,
P
<
0.01)。细胞免疫荧光结果显示:给予30 mJ/cm
2
UVB辐照导致p21发生明显的核移位。
结论
2
30 mJ/cm
2
UVB辐照可成功构建光老化HaCaT细胞模型,其机制可能是通过增强p21核定位及激活p16通路诱导了细胞衰老的进程。
Objective
2
To establish an efficient skin photoaging model in HaCaT cells and investigate the possible signaling pathways of photoaging of skin.
Methods
2
After HaCaT cells were exposed to UVB at 30 mJ/cm
2
cell proliferation and cell cycle was detected by CCK-8 assay and flow cytometry. The percentages of positive cells were detected by SA-β-gal staining. The expression of p53
p21 and p16 at mRNA and protein levels were detected by qRT-PCR and Western blotting respectively. The subcellular localization of p21 was elucidated by immunofluorescence assay.
Results
2
Exposure of UVB at 30 mJ/cm
2
resulted in significantly decreased proliferation (
P
<
0.01)
increased proportion of cells at G
2
phage (
P
<
0.05)
and more positive cells to SA-β-gal (
P
<
0.05) when compared with normal control cells. The results of qRT-PCR and Western blotting showed that UVB exposure up-regulated the expression levels of p53 and p16
and down-regulated that of p21 in HaCaT cells (
P
<
0.05
P
<
0.01). Immunofluorescence assay indicated obvious nuclear localization of
p21 in the HaCaT cells after UVB exposure.
Conclusion
2
UVB-exposure at 30 mJ/cm
2
successfully establish skin photoaging model in HaCaT cells
which may be due to senescence induced by increasing nuclear localization of p21 and activating p16-dependent pathway.
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