1.中山大学孙逸仙纪念医院临床研究中心,广东 广州 510120
2.中山大学孙逸仙纪念医院消化内科,广东 广州 510120
3.中山大学孙逸仙纪念医院综合科,广东 广州 510120
4.深圳市人民医院,广东 深圳 518020
侯婧瑛,博士,副主任医师,研究方向:消化道肿瘤,E-mail:maomaohjy@126.com
收稿:2021-05-14,
纸质出版:2021-09-20
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侯婧瑛,吴雅娴,金小岩等.LncRNA-PVT1/miR-15a/Bmi-1通路调控HGC-27胃癌细胞的体外增殖[J].中山大学学报(医学科学版),2021,42(05):703-713.
HOU Jing-ying,WU Ya-xian,JIN Xiao-yan,et al.LncRNA-PVT1/miR-15a/Bmi-1 Pathway Regulates the Proliferation of HGC-27 Gastric Cancer Cells in Vitro[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(05):703-713.
侯婧瑛,吴雅娴,金小岩等.LncRNA-PVT1/miR-15a/Bmi-1通路调控HGC-27胃癌细胞的体外增殖[J].中山大学学报(医学科学版),2021,42(05):703-713. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2021.0508.
HOU Jing-ying,WU Ya-xian,JIN Xiao-yan,et al.LncRNA-PVT1/miR-15a/Bmi-1 Pathway Regulates the Proliferation of HGC-27 Gastric Cancer Cells in Vitro[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(05):703-713. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2021.0508.
目的
2
探讨lncRNA
-PVT1/
miR-15a
/Bmi-1
通路在胃癌细胞体外增殖中的调控作用。
方法
2
分别研究
PVT1,
miR-15a及
Bmi-1
在HGC-27胃癌细胞体外增殖中的作用。体外培养的人胃癌细胞株HGC-27分为如下组别:①空白对照组、si-
PVT1
(转染
PVT1
siRNA)和si-
PVT1
NC(转染
PVT1
siRNA scramble阴性对照);②空白对照组、miR-15a(转染miR-15a模拟物)和miR-15a NC(转染miR-15a模拟物的阴性对照)。③空白对照组、si-
Bmi-1
(转染
Bmi-1
的siRNA)和si-
Bmi-1
NC(转染
Bmi-1
的siRNA scramble阴性对照)。采用MTS法检测上述组别的细胞增殖情况。在抑制
PVT1
后检测不同组别
PVT1、
miR-15a和
Bmi-1
的表达情况。为验证miR-15a与
Bmi-1
之间的调节关系,将HGC-27胃癌细胞株分为3组:空白对照、miR-15a(转染miR-15a模拟物)和miR-15a NC(转染模拟物阴性对照),检测各组miR-15a和
Bmi-1
的表达情况。通过生物信息学网站预测
PVT1
与miR-15a以及miR-15a与
Bmi-1
的潜在结合位点。采用双荧光素酶报告基因技术验证
PVT1
与miR-15a以及miR-15a和
Bmi-1
之间的靶向调节关系。在前述基础上,逆向验证
PVT1
、miR-15a和
Bmi-1
三者之间的调控关系。
结果
2
抑制
PVT1、Bmi-1
或者过表达miR-15a后,HGC-27胃癌细胞的OD
490
值以及增殖率在0 h后的不同时间点均出现显著降低(
P
<
0.01);抑制
PVT1
后,
Bmi-1
的表达出现降低,而miR-15a表达增高(
P
<
0.01);转染miR-15a后,miR-15a表达升高,而
Bmi-1
表达出现降低(
P
<
0.01)。与空白对照和miR-15a模拟物阴性对照组相比,
PVT1
以及
Bmi-1
野生型报告基因的萤光素酶活性在miR-15a模拟物组呈现显著降低,两者分别下降约56%和32%左右(
P
<
0.01)。与空白对照组和si-
PVT1
NC组相比,si-
PVT1
组
PVT1
和
Bmi-1
表达明显下降,miR-15a表达升高,在si-
PVT1
组加入miR-15a
inhibitor之后,miR-15a表达下降,
PVT1
和
Bmi-1
的表达降低均出现了逆转;而si-
PVT1
组加入miR-15a后,miR-15a表达升高,在si-
PVT1
组加入miR-15a之后,miR-15a表达升高,
PVT1
和
Bmi-1
的表达出现进一步下降。
结论
2
LncRNA
-PVT1
能够通过靶向抑制miR-15a上调
Bmi-1
(lncRNA
-PVT1/
miR-15a
/Bmi-1
通路),进而促进胃癌细胞的体外增殖。
Objective
2
To investigate the role of lncRNA
-PVT1/
miR-15a
/ Bmi-1
pathway in the proliferation of HGC-27 gastric cancer cells in vitro.
Methods
2
Gastric cancer cell line HGC-27 was cultured in vitro and divided into the following groups: (1) blank control, si-
PVT1
and si-
PVT1
NC. The si-
PVT1
and si-
PVT1
NC groups were transferred with
PVT1
siRNA and
PVT1
siRNA scramble, respectively. (2) blank control, miR-15a and miR-15a NC. (3) blank control, si-
Bmi-1
and si-
Bmi-1
NC. Cell proliferation was evaluated by using MTS. The expression of
PVT1
, miR-15a and
Bmi-1
was detected in the condition of
PVT1
inhibition. In order to validate the relationship between miR-15a and
Bmi-1
,
miR-15a
mimic was transfected into HGC-27 gastric cancer cell line, and the expression of miR-15a and
Bmi-1
was examined. The potential complementary binding sites of
PVT1
and miR-15a
,
and miR-15a and
Bmi-1
were predicted by bioinformatics. Dual-luciferase reporter assay was performed to detect luciferase activity of the different groups of cells in order to verify the relationship between
PVT
1 and miR-15a and miR-15a and
Bmi-1
. Relevant rescue experiment was conducted in order to further validate the mutual relationship of lncRNA
-PVT1,
miR-15a
and Bmi-1
.
Results
2
OD
490
value and cell proliferation rate were significantly decreased in the condition of
PVT1
or
Bmi-1
inhibition, or miR-15a overexpression (
P
<
0.01). The expression of
Bmi-1
was decreased in si-
PVT1
group, whereas miR-15a was increased (
P
<
0.01). miR-15a was increased after transfection, whereas the expression of Bmi-1 was decreased (
P
<
0.01). The dual luciferase reporter assay indicated that both the
PVT1
and
Bmi-1
reporter gene luciferase activity were decreased significantly in miR-15a mimics group, down-regulating 56% and 32%, respectively (
P
<
0.01). The expression of
PVT1
and Bmi-1 was elevated in the condition of
PVT1
knockdown and miR-15a inhibition, whereas both of their expression were further decreased in the condition of
PVT1
knockdown and miR-15a transfection.
Conclusion
2
LncRNA
-PVT1
could upregulate
Bmi-1
(lncRNA
-PVT1/
miR-15a
/Bmi-1
pathway) to promote the proliferation of gastric cancer cells in vitro by inhibiting miR-15a.
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