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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
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