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丝素肽对Aβ25-35致SH-SY5Y细胞损伤的保护作用及机制研究

Protective effect of fibroin peptides on Aβ25-35-induced injury in SH-SY5Y cells and its mechanism

  • 摘要: 探讨丝素肽对Aβ25-35所致SH-SY5Y细胞损伤的保护作用及其相关机制。建立Aβ25-35损伤SH-SY5Y细胞模型,并以丝素肽干预。MTT法检测丝素肽对Aβ25-35致SH-SY5Y细胞损伤的干预作用;Western blot检测丝素肽对Aβ25-35致神经元Tau蛋白多位点过度磷酸化的影响及其作用机制;DCFH-DA探针法检测丝素肽对Aβ25-35致SH-SY5Y细胞胞内活性氧(ROS)异常升高的影响。结果表明,丝素肽可改善Aβ25-35致SH-SY5Y细胞损伤。丝素肽可通过抑制GSK-3β活性、增强PP2A活性,改善Aβ25-35引起的神经元Tau蛋白异常磷酸化水平,提示丝素肽可通过调节Tau蛋白的磷酸化发挥神经保护作用。同时,丝素肽可降低Aβ25-35引起的SH-SY5Y细胞胞内升高的ROS水平,提示丝素肽还可通过调节氧化应激反应途径保护神经元。

     

    Abstract: This study aimed at exploring the molecular mechanism of fibroin peptide in preventing the Aβ25-35-induced neuronal damages in SH-SY5Y cells. MTT was used to detect the effect of fibroin peptide on the changes of the Aβ25-35-induced injuries in SH-SY5Y cells; Western blot was employed to detect the effect of fibroin peptide on the changes of the Aβ25-35-induced hyperphosphorylation of Tau in SH-SY5Y cells; DCFH-DA probe method was used to detect the effect of fibroin peptide on the Aβ-induced production of intracellular reactive oxygen species(ROS)in SH-SY5Y cells. The results indicated that fibroin peptide could improve the activity of the PP2A and inhibit the activity of GSK-3β to decrease the hyperphosphorylation of Tau induced by Aβ25-35. Fibroin peptide could significantly prevent the Aβ25-35-induced neuronal damages and multisite Tau hyperphosphorylation. In addition, fibroin peptide could also reduce oxidative damage to protect neurons by significantly decreasing the Aβ25-35-induced production of intracellular ROS.

     

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