Department of Pediatrics, General Hospital of Tianjin Medical University, No. 154, Anshan Road, Heping District, Tianjin, 300050, People's Republic of China.
Neurochem Res. 2022 Oct;47(10):3150-3166. doi: 10.1007/s11064-022-03670-5. Epub 2022 Aug 26.
Evidence exists reporting that miR-410 may rescue neurological deficits, neuronal injury, and neuronal apoptosis after experimental hypoxic ischemia. This study aimed to explore the mechanism by which miR-410 transferred by bone marrow-derived mesenchymal stem cell-derived extracellular vesicles (BMSC-EVs) may alleviate hypoxic-ischemic brain damage (HIBD) in newborn mice. BMSCs were isolated from total bone marrow cells of femur and tibia of newborn mice, and primary neurons were extracted from the cerebral cortex of newborn mice within 24 h of birth. EVs were extracted from BMSCs transfected with the mimic or inhibitor of miR-410. Primary neurons were subjected to hypoxia and treated with overexpression (oe)-HDAC4, small interfering RNA (siRNA)-β-catenin, or Wnt pathway inhibitor and/or EV (miR-410 mimic) or EV (miR-410 inhibitor). A neonatal mouse HIBD model was established and treated with EVs. When BMSC-EVs were endocytosed by primary neurons, miR-410 was upregulated, neuronal viability was elevated, and apoptosis was inhibited. miR-410 in BMSC-EVs targeted HDAC4, thus increasing neuronal viability and reducing apoptosis. Conversely, overexpression of HDAC4 activated the Wnt pathway and enhanced the nuclear translocation of β-catenin. Treatment with miR-410-containing BMSC-EVs improved learning and memory abilities of HIBD mice while attenuating apoptosis by inactivating the Wnt pathway via targeting HDAC4. Taken together, the findings suggest that miR-410 delivered by BMSC-EVs alleviates HIBD by inhibiting HDAC4-dependent Wnt pathway activation.
有证据表明,miR-410 可能通过挽救实验性缺氧缺血后的神经功能缺损、神经元损伤和神经元凋亡来发挥作用。本研究旨在探讨骨髓间充质干细胞衍生的细胞外囊泡(BMSC-EVs)转染的 miR-410 通过何种机制减轻新生小鼠缺氧缺血性脑损伤(HIBD)。从新生小鼠股骨和胫骨的总骨髓细胞中分离 BMSC,并在出生后 24 小时内从新生小鼠大脑皮层中提取原代神经元。从转染 miR-410 模拟物或抑制剂的 BMSC 中提取 EVs。将原代神经元置于缺氧环境中,并进行过表达(oe)-HDAC4、β-catenin 小干扰 RNA(siRNA)或 Wnt 通路抑制剂和/或 EV(miR-410 模拟物)或 EV(miR-410 抑制剂)处理。建立新生小鼠 HIBD 模型并进行 EV 治疗。当 BMSC-EVs 被原代神经元内吞时,miR-410 上调,神经元活力增加,凋亡受到抑制。BMSC-EVs 中的 miR-410 靶向 HDAC4,从而增加神经元活力并减少凋亡。相反,HDAC4 的过表达激活了 Wnt 通路,并增强了β-catenin 的核易位。用含有 miR-410 的 BMSC-EVs 治疗可改善 HIBD 小鼠的学习和记忆能力,同时通过靶向 HDAC4 抑制 Wnt 通路的激活来减轻细胞凋亡。综上所述,这些发现表明,BMSC-EVs 递送的 miR-410 通过抑制 HDAC4 依赖性 Wnt 通路激活来减轻 HIBD。