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第44卷第11期 潘锦堃,李超普,张 许,等. miR⁃199a⁃5p在肝脏组织中的表达及其作用的初步研究[J].
2024年11月 南京医科大学学报(自然科学版),2024,44(11):1510-1516 ·1513 ·
用,分别在 Hepa1⁃6 和 AML12 细胞中过表达 miR⁃ 2.3 miR⁃199a⁃5p靶向CD36
199a⁃5p(miR⁃199a⁃5p⁃mimic),并对 miR⁃199a⁃5p 的 为深入探讨miR⁃199a⁃5p对肝细胞内TAG含量
过表达效率进行验证(图 2A、B)。肝细胞经过 的影响机制,通过 miRDB 网站预测了 miR⁃199a⁃5p
300 μmol/L OA 处理 24 h 后,miR⁃199a⁃5p 过表达的 的靶基因,发现CD36 mRNA的3′ UTR区域包含2个
Hepa1⁃6 细胞和 AML12 细胞内 TAG 含量均显著降 miR⁃199a⁃5p的靶向位点,这可能导致其表达水平下
低(图2C、D),而使用miR⁃199a⁃5p抑制剂处理后,细 降(图 3A)。为验证 miR⁃199a⁃5p 是否靶向 CD36
胞内 TAG 含量增加差异均有统计学意义(图 2E、 mRNA 的 3′ UTR 区域并影响其蛋白质翻译,将
F)。以上结果提示miR⁃199a⁃5p可能通过调节肝细 CD36 mRNA 的3′ UTR克隆后通过同源重组的方法
胞中TAG含量来影响肝脏脂质代谢过程。 插入 PGL3 质粒的下游(图 3B)。随后在 Hepa1⁃6 细
A B C D
GSE13840 ND HFD 8 3 *
8 000 * 6 ** 2
miR⁃199a⁃5p expression level 4 000 miR⁃199a⁃5p expression level 4 2 miR⁃199a⁃5p expression level 1
6 000
2 000
0
ND HFD 0 Fed Fast
0
WT ob/ob
A:The expression levels of miR⁃199a⁃5p in GEO database GSE13840(n=8 for the WT group and n=10 for the ob/ob group). B:Liver oil red(ORD)
staining was observed in C57BL/6J mice after feeding normal diet(ND)and high⁃fat diet(HFD)for 15 weeks(×40). C:Expression levels of miR⁃199a⁃5p
in the liver tissues of the ND and HFD mice(n=3). D:Expression levels of miR⁃199a⁃5p in mice with ND under the state of feeding and starvation for 16 h,
* **
P < 0.05 and P < 0.01(n=3).
图1 不同营养状态下小鼠肝脏中miR⁃199a⁃5p的表达水平
Figure 1 Expression levels of miR⁃199a⁃5p in mice liver tissues under different nutritional status
A C E
Hepa1⁃6 NC⁃mimic NC⁃inhibit
1 500 miR⁃199a⁃5p⁃mimic miR⁃199a⁃5p⁃inhibit
*** Hepa1⁃6 Hepa1⁃6
miR⁃199a⁃5p expression level 500 (μmol/g) 200 * (μmol/g) 200 **
1 000
150
150
2.0
1.5
1.0
0.5 100 100
0 TAG 50 TAG 50
miR⁃199a⁃5p⁃mimic 0 BSA OA 0 BSA OA
NC⁃mimic
B AML12 D NC⁃mimic F NC⁃inhibit
2 000 ** miR⁃199a⁃5p⁃mimic miR⁃199a⁃5p⁃inhibit
1 500
AML12
AML12
miR⁃199a⁃5p expression level 1 000 (μmol/g) 250 * (μmol/g) 250
*
500
200
200
2.0
150
150
1.5
1.0
0.5 100 100 *
0 TAG 50 TAG 50
NC⁃mimic
miR⁃199a⁃5p⁃mimic 0 BSA OA 0 BSA OA
A,B:Overexpression efficiency of miR⁃199a⁃5p mimic transfected in Hepa1⁃6(A)and AML12(B)cells. C,D:Hepa1⁃6(C)and AML12(D)
cells overexpressed with miR⁃199a⁃5p were treated with serum⁃free medium supplemented with 300 μmol/L OA for 24 h,and samples were collected for
detection of intracellular TAG content. E,F:After the expression of miR⁃199a⁃5p was inhibited in Hepa1⁃6(E)and AML12(F)cells,serum free medi⁃
um supplemented with 300 μmol/L OA was used for 24 h,and the samples were collected for detection of intracellular TAG content. P < 0.05,P < 0.01,
*
**
***
and P < 0.001(n=3).
图2 miR⁃199a⁃5p调节Hepa1⁃6和AML12细胞中脂质水平
Figure 2 miR⁃199a⁃5p regulated lipid levels in Hepa1⁃6 and AML12 cells