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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
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MPP(mmol/L) MPP(mmol/L) MPP +PBS
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D E F
■ NC
2.0 □ MPP + * NC Mimic NC Mimic 1.5 *
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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 +
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NC+MPP
NC+MPP
NC+MPP
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A:Morphological changes of SH⁃SY5Y cells after MPP treatment(×100). B:Relative cell viability and relative LDH activity of SH⁃SY5Y cells
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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
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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
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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
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Figure 4 ReN⁃NV exerts neuroprotective effects in vitro by delivering let⁃7i⁃5p to inhibit MPP ⁃induced neuronal apoptosis
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