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第46卷第9期     魏甲园,徐聖业,朱妍妍,等. ReN细胞来源纳米囊泡中的let⁃7i⁃5p在帕金森病模型中通过抗凋亡作用
                  2026年9月             发挥保护效应[J]. 南京医科大学学报(自然科学版),2026,46(9):1303-1314                   ·1311 ·


                miRNA。这些 miRNA 在神经源性 NV 中丰度较高,                    以提高细胞活力,从而可能起到保护作用(图 4D)。
                并与神经发育、抗凋亡及神经保护功能相关。进一                            考虑到细胞凋亡在 PD 神经元死亡中的核心地位,
                步结合文献报道和靶基因功能预测分析,从中选取                            继而探究了let⁃7i⁃5p是否通过调控凋亡通路来发挥
                了 8 个具有代表性的 miRNA 进行功能验证。通过                       作用。Western blot结果表明,在经MPP 处理的细胞
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                在SH⁃SY5Y细胞中转染这8个miRNA的模拟物,联                       中,过表达let⁃7i⁃5p能够显著上调抗凋亡蛋白Bcl⁃2
                合 MPP 处理,细胞活力检测发现 let⁃7i⁃5p mimic 可               与促凋亡蛋白Bax的比值(图4E、F),凋亡通路下游
                      +
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                                      A           SH⁃SY5Y          SH⁃SY5Y+MPP (1 mmol/L)











                B                                                                        C   1.5    **
                      1.5           *
                                                           3         *  **                               *
                                  *
                     Relative cell viability  1.0        Relative activity of LDH  2 1      Relative cell viability  1.0


                                                                                             0.5
                      0.5

                       0                                   0                                   0
                         Control 0.25 0.50 1.00 2.00         Control 0.25 0.50 1.00 2.00       Control  +  MPP +RV
                                                                                                        +
                                 MPP(mmol/L)                         MPP(mmol/L)                  MPP +PBS
                                    +
                                                                        +
                D                                        E                               F
                        ■ NC
                    2.0  □ MPP +      *                          NC Mimic NC Mimic          1.5           *
                                                                              +
                   Relative cell viability  1.5             Bcl⁃2                 21 kDa   Bcl⁃2/Bax ratio  1.0
                                                                           MPP
                                                             Bax
                    1.0
                                                                                            0.5
                                                                                  26 kDa
                    0.5
                     0                                   α⁃tubulin                55 kDa     0          +  +
                      Control  miR⁃21⁃5p miR⁃92b⁃3p miR⁃148a⁃3p  let⁃7i⁃5p                      NC Mimic Mimic+MPP
                                     miR⁃99⁃5p
                             miR⁃26a⁃5p
                                          miR⁃151a⁃3p
                                          miR⁃151a⁃3p
                        miR⁃9⁃5p
                                                                                                   NC+MPP
                G                           H          **           I         **           J         **
                                                4
                                                             **        4                      8
                              MPP +                       *                     *   *                  **
                     NC Mimic NC Mimic          3                     mRNA expression  3      6
                 Cleaved  Caspase⁃3  17/19 kDa  Cleaved Caspase⁃3  2 1  2 1                  IL⁃6 mRNA expression  4 2
                   HSP70            70 kDa      0  NC  Mimic Mimic+MPP  +  IL⁃1β  0  NC  Mimic  Mimic+MPP  +  0  NC  Mimic Mimic+MPP  +
                                                                                  +
                                                                                                         +
                                                           +
                                                                              NC+MPP
                                                                                                     NC+MPP
                                                       NC+MPP
                                                       +
                   A:Morphological changes of SH⁃SY5Y cells after MPP treatment(×100). B:Relative cell viability and relative LDH activity of SH⁃SY5Y cells
                                                                                                       +
                                            +
                treated with different concentrations of MPP . C:Relative cell viability of SH⁃SY5Y cells co⁃treated with ReN⁃NV and 1 mmol/L MPP . D:Relative
                                                                                   +
                cell viability of SH⁃SY5Y cells transfected with various miRNA mimics and subsequently exposed to MPP(n=3). E,F:Protein expression levels of Bax
                and Bcl⁃2 following overexpression of let⁃7i⁃5p. G,H:Protein expression levels of Cleaved Caspase⁃3 following overexpression of let⁃7i⁃5p. I,J:The
                                                                                   **
                                                                            *
                expression of IL⁃1β and IL⁃6 mRNA in BV2 cells after transfection with let⁃7i⁃5p mimic(n=3). P < 0.05,P < 0.01.
                              图4   ReN⁃NV通过递送let⁃7i⁃5p抑制MPP 诱导的神经元凋亡,从而发挥体外保护作用
                                                                +
                Figure 4  ReN⁃NV exerts neuroprotective effects in vitro by delivering let⁃7i⁃5p to inhibit MPP ⁃induced neuronal apoptosis
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