丹红注射液改善神经干细胞移植治疗脑缺血损伤效果的机制研究

Mechanism of Danhong injection in improving therapeutic effect of neural stem cell transplantation for cerebral ischemia injury

  • 摘要:
      目的  探讨丹红注射液能否通过调控核因子E2相关因子2(Nrf2)信号通路增强神经干细胞(NSC)移植修复脑缺血损伤的治疗效果。
      方法  40只雄性SD大鼠随机分为NSC移植治疗组(NSC组)、丹红注射液组(DH组)、NSC+丹红注射液组(N+D组)、NSC+丹红注射液组+ML385组(N+D+M组)和PBS对照组(PBS组),每组8只。所有大鼠均采用大脑中动脉栓塞法建立脑缺血模型,栓塞1.5 h后进行再灌注。再灌注后3 d对各组大鼠进行相应处理。在NSC移植术前和术后1、2、4周进行神经功能评分。术后4周后处死大鼠,检测氧化应激相关指标,并用免疫荧光染色检测神经元特异核蛋白(NeuN)和血管性血友病因子(vWF)的表达情况。
      结果  在NSC移植术前,各组大鼠的神经功能评分比较,差异无统计学意义(P > 0.05)。术后1、2、4周时,NSC组、DH组和N+D组大鼠的神经功能评分较PBS组和N+D+M组均降低(均为P < 0.05)。与PBS组和N+D+M组比较,NSC组、DH组和N+D组的丙二醛(MDA)水平均降低,超氧化物歧化酶(SOD)和谷胱甘肽过氧化物酶(GPX)水平均升高(均为P < 0.05);N+D+M组的GPX水平较PBS组降低(P < 0.05)。免疫荧光染色结果显示,移植到大鼠脑内的NSC能够迁移至脑梗死周边区域并存活,并表达神经元标志物NeuN和新生血管标志物vWF,而N+D+M组的NSC存活数量较其他组明显减少。
      结论  丹红注射液可能通过调控Nrf2信号通路改善干细胞移植微环境,增加移植干细胞的存活率,提升NSC移植治疗脑缺血损伤效果。

     

    Abstract:
      Objective  To investigate whether Danhong injection can enhance the therapeutic effect of neural stem cell (NSC) transplantation in repairing cerebral ischemia injury by regulating the nuclear factor E2-related factor 2 (Nrf2) signaling pathway.
      Methods  Forty male SD rats were randomly divided into the NSC transplantation group (NSC group), Danhong injection group (DH group), NSC+ Danhong injection group (N+D group), NSC+ Danhong injection group +ML385 group(N+D+M group) and PBS control group (PBS group), 8 rats in each group. All rat models of cerebral ischemia were established by embolization of the middle cerebral artery. Reperfusion was performed at 1.5 h after embolization. All rats in each group received corresponding interventions at 3 d after reperfusion. The neurological function score was evaluated before and 1, 2, 4 weeks after NSC transplantation. All rats were sacrificed at 4 weeks after NSC transplantation. The parameters related to oxidative stress were detected. The expression levels of neuron-specific nuclear protein (NeuN) and von Willebrand factor (vWF) were determined by immunofluorescence staining.
      Results  Before NSC transplantation, the neurological function scores did not significantly differ among different groups (all P > 0.05). At postoperative 1, 2 and 4 weeks, the neurological function scores in the NSC, DH and N+D groups were significantly lower than those in the PBS and N+D+M groups (all P < 0.05). Compared with the PBS and N+D+M groups, the malondialdehyde (MDA) levels were significantly decreased, whereas the superoxide dismutase (SOD) and glutathione peroxidase (GPX) levels were considerably increased in the NSC, DH and N+D groups (all P < 0.05). The GPX level in the N+D+M group was significantly lower than that in the PBS group (P < 0.05). Immunofluorescence staining showed that the transplant NSC in the rat brain migrated to the surrounding area of cerebral infarction and survived, and expressed neuronal marker NeuN and neovascularization marker vWF. However, the number of living NSC in the N+D+M group was significantly lower compared with those in the remaining groups.
      Conclusions  Danhong injection may improve the microenvironment of stem cell transplantation, enhance the survival rate of transplant NSC and improve the therapeutic effect of NSC transplantation for cerebral ischemia injury probably by regulating the Nrf2 signaling pathway.

     

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