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北京医院 国家老年医学中心 卫生部老年医学重点实验室,北京 100730
张鑫,博士,助理研究员,从事人体衰老与肿瘤研究,E-mail:303063231@qq.com
*林雅军,博士,副研究员,从事人体衰老与肿瘤研究,E-mail:linyajun2000@126.com
收稿日期:2018-12-03,
网络出版日期:2019-02-12,
纸质出版日期:2019-05-20
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张鑫, 赵慧, 魏洁, 等. 斑蝥素诱导HCT116细胞形态改变及脱黏附机制[J]. 中国实验方剂学杂志, 2019,25(10):20-25.
Xin ZHANG, Hui ZHAO, Jie WEI, et al. Mechanism of Cantharidin-induced Morphological Changes and Dissociation of HCT116 Cells[J]. Chinese journal of experimental traditional medical formulae, 2019, 25(10): 20-25.
张鑫, 赵慧, 魏洁, 等. 斑蝥素诱导HCT116细胞形态改变及脱黏附机制[J]. 中国实验方剂学杂志, 2019,25(10):20-25. DOI: 10.13422/j.cnki.syfjx.20191024.
Xin ZHANG, Hui ZHAO, Jie WEI, et al. Mechanism of Cantharidin-induced Morphological Changes and Dissociation of HCT116 Cells[J]. Chinese journal of experimental traditional medical formulae, 2019, 25(10): 20-25. DOI: 10.13422/j.cnki.syfjx.20191024.
目的:
2
探讨斑蝥素(cantharidin,CTD)引起人结肠癌HCT116细胞形态改变及脱黏附作用的分子机制与抑制肿瘤转移的相关性,为CTD的临床使用提供新依据。
方法:
2
将HCT116细胞接种于6孔板后,每孔加入不同浓度CTD (0,2.5,5,10,15,20 μmol·L
-1
)培养7~10 d,使用结晶紫染色液染色,对形成的克隆进行计数及统计分析,确定CTD对HCT116细胞的抑制效果;使用鬼笔环肽(phalloidin)特异性染色检测10 μmol·L
-1
CTD对HCT116细胞聚合态微丝骨架(F-actin)的影响,间接免疫荧光染色法观察CTD作用后整合素蛋白含量的改变;蛋白免疫印迹法分析10 μmol·L
-1
CTD作用前后Rho家族RhoA,RhoB,RhoC,Cdc42,Rac1/2/3蛋白表达量变化,根据实验结果确定RhoA为研究目标蛋白;使用质粒瞬时转染方法构建过表达RhoA的HCT116结肠癌细胞,观察10 μmol·L
-1
CTD对过表达细胞骨架形态及黏附的影响。
结果:
2
CTD可引起HCT116结肠癌细胞微丝骨架重构及整合素含量减少;RhoA蛋白是CTD作用后含量变化最大的Rho酶家族成员,构建的RhoA过表达细胞中带绿色荧光的转染细胞比例约为60%,与野生型细胞相比,目标蛋白含量显著增高(
P
<
0.01),CTD通过降低RhoA含量,逆转这一过表达效应(
P
<
0.01),对细胞的形态及黏附均产生影响。
结论:
2
CTD可通过抑制RhoA蛋白的表达,引起HCT116结肠癌细胞形态改变及与基底的黏附减弱,游离的肿瘤细胞无法锚定于继发部位,从而抑制细胞迁移。
Objective:
2
To explore the molecular mechanism of cantharidin(CTD) in inducing morphological changes and dissociation in human colon cancer HCT116 cells
in order to study the correlation with tumor metastasis and provide a new basis for clinical use of cantharidin.
Method:
2
Different concentrations of CTD (0
2.5
5
10
15
20 μmol·L
-1
) were added to each hole to culture for 7 to 10 days
so as to determine the inhibitory effect of CTD on HCT116 cells; and changes of F-actin cytoskeleton and integrin in HCT116 cells were detected by immunofluorescence staining. Western blot analysis of protein expressions of RhoA
RhoB
RhoC
Cdc42 and Rac1/2/3 of Rho family were performed before and after cantharidin treatment. overexpression of RhoA was constructed by plasmid transient transfection
and effect of 10 μmol·L
-1
cantharidin on the morphology and adhesion of overexpressing cells was also observed.
Result:
2
Cantharidin induced cytoskeletal remodeling and decreased integrin content in HCT116 colon cancer cells. RhoA protein was a member of Rho enzyme family with the greatest variation after cantharidin action. The proportion of transfected RhoA cells with green fluorescence was about 60%
the expression of RhoA protein in constructed RhoA overexpression cells was significantly increased
compared with wild-type HCT116 cells (
P
<
0.01). However
cantharidin can act on RhoA overexpressed HCT116 cells
reverse its overexpression(
P
<
0.01)
and affect its morphology.
Conclusion:
2
Cantharidin can inhibit the expression of RhoA protein
induce the morphological changes of HCT116 cells and weaken the adhesion to the basement
thereby inhibiting cell migration.
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