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皮肤鳞状细胞癌(鳞癌)约占所有非黑素瘤皮肤癌的20%,是继基底细胞癌之后第二大常见非黑素瘤皮肤癌[1]。非黑素瘤皮肤癌中不同类型肿瘤的相对比例正在发生变化,与基底细胞癌相比,皮肤鳞癌的发病率呈上升趋势,在老年人群中其增长趋势尤其显著[2]。虽然多数病人通过手术联合放疗可以有效治疗皮肤鳞癌,但是对于转移病人预后不佳[3]。对于皮肤鳞癌发病机制的深入研究尤为重要。微小RNA(microRNA,miR)是一类由内源基因编码的长度约为22个核苷酸的非编码单链RNA分子,通常在转录后发挥作用,通过抑制翻译过程或降解靶mRNA来调节蛋白质表达。miR与几乎所有正常细胞功能相关,广泛参与包括增殖、分化和凋亡在内的各种细胞活动。miR-127位于母系印迹基因Dlk1/Gt12区域内[4],主要受到小异二聚体配体和雌激素相关受体γ等核受体信号的调控[5],其在结直肠癌、急性髓性白血病以及骨肉瘤等肿瘤中表达明显升高[6-8]。但目前对于miR-127在皮肤鳞癌中的研究较少,本研究通过检测miR-127在皮肤鳞癌、癌旁组织中的表达水平差异,同时调控miR-127在皮肤鳞癌细胞系中的表达,探讨miR-127对皮肤鳞癌细胞的生物学行为调控作用,为临床诊疗提供参考。现作报道。
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采用qRT-PCR检测皮肤鳞癌组织以及癌旁组织中miR-127的表达水平,结果显示,miR-127在皮肤鳞癌组织中表达2.94±0.25,明显高于癌旁组织的1.17±0.17(t=10.14,P < 0.01),在皮肤鳞癌组织中含量为癌旁组织的2.9倍。
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分别收集HaCaT细胞、A431细胞以及HSC-5细胞中的RNA,采用qRT-PCR检测3种细胞中miR-127的表达水平。相较于HaCaT细胞,miR-127表达水平在A431细胞以及HSC-5细胞中显著升高,差异有统计学意义(P < 0.05)(见表 1)。
分组 n miR-127相对平均表达水平 HaCaT 3 0.99±0.18 A431 3 2.11±0.70* HSC-5 3 2.15±0.32* F — 6.25 P — < 0.05 MS组内 — 0.208 q检验:与HaCaT细胞比较* P < 0.05 表 1 miR-127在HaCaT细胞、A431细胞以及HSC-5细胞中的相对表达水平
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分别将miR-127 agomir.miR-127 antagomir以及NC agomir和NC antagomir转染A431细胞,结果显示,上调miR-127表达后,A431细胞的增殖及侵袭能力显著增强;下调miR-127的表达后,A431细胞的增殖及侵袭能力受到抑制(P < 0.05)(见图 1、表 2)。
分组 n 视野内细胞数 上调表达 miR127 agomir 3 18.3±3.5 NC agomir 3 11.3±2.1 t — 2.97 P — < 0.05 下调表达 miR127 antagomir 3 7.3±2.5 NC antagomir 3 13.3±1.5 t — 3.53 P — < 0.05 表 2 调控miR-127后细胞侵袭能力比较(x ± s)
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通过生物信息学预测网站我们发现miR-127与抑癌基因PTEN存在结合位点,进一步通过双荧光素酶报告基因实验我们发现miR-127可以与PTEN直接结合(见图 2)。调控miR-127后PTEN在蛋白水平的表达发生改变,其中miR-127+PTEN组荧光素酶相对强度高于Control+PTEN组,Control+PTENmut组荧光素酶相对强度均高于miR-127+PTENmut组(P < 0.05);miR-127 agomir组PTEN蛋白表达水平低于NC agomir组和NC antagomir组,miR-127 antagomir组PTEN蛋白表达水平高于NC agomir组和NC antagomir组(P < 0.05)(见表 3~4)。
分组 n 荧光素酶相对强度 Control+PTEN 3 1.04±0.30 miR-127+PTEN 3 0.50±0.15* Control+PTENmut 3 1.11±0.18 miR-127+PTENmut 3 1.07±0.29# F — 4.35 P — < 0.05 MS组内 — 0.057 q检验:与Control+PTEN组比较* P < 0.05;与Control+PTENmut组比较# P < 0.05 表 3 调控miR-127后不同组荧光素酶相对强度比较(x ± s)
分组 n PTEN蛋白表达水平 miR-127 agomir 3 0.61±0.15*# NC agomir 3 1.10±0.14 miR-127 antagomir 3 2.09±0.29*# NC antagomir 3 1.07±0.15 F — 31.36 P — < 0.01 MS组内 — 0.037 q检验:与NC agomir组比较* P < 0.05;与NC antagomir组比较# P < 0.01 表 4 不同调控组PTEN蛋白表达水平(x ± s)
miR-127对皮肤鳞状细胞癌细胞生物学行为调控作用研究
Study on the regulatory effects of miR-127 on biological behavior of cutaneous quamous cell carcinoma cells
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摘要:
目的探讨miR-127对皮肤鳞状细胞癌(鳞癌)细胞的生物学行为调控作用。 方法收集皮肤鳞癌组织、癌旁正常组织标本,采用实时定量PCR检测miR-127在2组标本中的表达水平。调控鳞癌细胞株A431中miR-127表达水平,检测鳞癌细胞增殖、侵袭能力的变化。通过生物信息学预测网站及分子生物学方法验证miR-127的作用靶点。 结果miR-127在皮肤鳞癌组织中表达明显高于癌旁组织(P < 0.01)。相较于HaCaT细胞,miR-127表达水平在A431细胞以及HSC-5细胞中显著升高,差异有统计学意义(P < 0.05)。上调miR-127表达后,A431细胞的增殖及侵袭能力显著增强;下调miR-127的表达后,A431细胞的增殖及侵袭能力受到抑制(P < 0.05)。通过双荧光素酶报告基因实验发现miR-127可以与PTEN直接结合,调控miR-127后PTEN在蛋白水平的表达发生改变(P < 0.05)。 结论miR-127参与调控鳞癌细胞的生物学行为,miR-127可能作为治疗皮肤鳞癌的一个潜在的靶点。 Abstract:ObjectiveTo investigate the regulatory effects of miR-127 on biological behavior of skin squamous cell carcinoma cells. MethodsThe samples of skin squamous cell carcinoma tissues and adjacent normal tissues were collected, and the expression levels of miR-127 in two groups were detected by real-time quantitative PCR.The expression level of miR-127 in squamous cell carcinoma cell line A431 was regulated to detect the changes of proliferation and invasion ability of squamous cell carcinoma cells.The targets of miR-127 were verified by bioinformatics prediction websites and molecular biological methods. ResultsThe expression level of miR-127 in skin squamous cell carcinoma tissues was significantly higher than that in adjacent tissues(P < 0.01).Compared with HaCaT cells, the expression levels of miR-127 in A431 cells and HSC-5 cells significantly increased, and the difference of which was statistically significant(P < 0.05).After up-regulating the expression of miR-127, the proliferation and invasion ability of A431 cells were significantly enhanced(P < 0.05).The proliferation and invasion ability of A431 cells were inhibited after down-regulating the expression of miR-127(P < 0.05).The results of dual luciferase reporter gene assay showed that the miR-127 could directly bind to PTEN, and the expression level of PTEN proetin was changed after regulating miR-127(P < 0.05). ConclusionsThe miR-127 is involved in the regulation of biological behavior of squamous cell carcinoma cells.miR-127 may be used as a potential molecular target in the treatment of skin squamous cell carcinoma. -
Key words:
- skin squamous cell carcinoma /
- miR-127 /
- proliferation /
- invasion
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表 1 miR-127在HaCaT细胞、A431细胞以及HSC-5细胞中的相对表达水平
分组 n miR-127相对平均表达水平 HaCaT 3 0.99±0.18 A431 3 2.11±0.70* HSC-5 3 2.15±0.32* F — 6.25 P — < 0.05 MS组内 — 0.208 q检验:与HaCaT细胞比较* P < 0.05 表 2 调控miR-127后细胞侵袭能力比较(x ± s)
分组 n 视野内细胞数 上调表达 miR127 agomir 3 18.3±3.5 NC agomir 3 11.3±2.1 t — 2.97 P — < 0.05 下调表达 miR127 antagomir 3 7.3±2.5 NC antagomir 3 13.3±1.5 t — 3.53 P — < 0.05 表 3 调控miR-127后不同组荧光素酶相对强度比较(x ± s)
分组 n 荧光素酶相对强度 Control+PTEN 3 1.04±0.30 miR-127+PTEN 3 0.50±0.15* Control+PTENmut 3 1.11±0.18 miR-127+PTENmut 3 1.07±0.29# F — 4.35 P — < 0.05 MS组内 — 0.057 q检验:与Control+PTEN组比较* P < 0.05;与Control+PTENmut组比较# P < 0.05 表 4 不同调控组PTEN蛋白表达水平(x ± s)
分组 n PTEN蛋白表达水平 miR-127 agomir 3 0.61±0.15*# NC agomir 3 1.10±0.14 miR-127 antagomir 3 2.09±0.29*# NC antagomir 3 1.07±0.15 F — 31.36 P — < 0.01 MS组内 — 0.037 q检验:与NC agomir组比较* P < 0.05;与NC antagomir组比较# P < 0.01 -
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