Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China.
Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang, China.
J Neurotrauma. 2019 Dec 15;36(24):3394-3409. doi: 10.1089/neu.2018.6364. Epub 2019 Aug 1.
Spinal cord injury (SCI) is a devastating neurological disorder that usually leads to a loss of motor and sensory function in patients. The expression of hypoxia inducible factor-1α (HIF-1α) is increased, and exerts a protective role after traumatic SCI. However, the endogenous activity of HIF-1α is insufficient for promoting functional recovery. The present study tested the potential effect of the sustained activation of HIF-1α by the prolylhydroxylase (PHD) inhibitor dimethyloxalylglycine (DMOG) on anti-apoptotic process and the regulation of axonal regeneration after SCI. Here, we found that treatment with DMOG significantly increased the expression of HIF-1α and that the stabilization of HIF-1α induced by DMOG not only decreased the expression of apoptotic proteins to promote neural survival, but also enhanced axonal regeneration by regulating microtubule stabilization and . In addition, we found that DMOG promoted neural survival and axonal regeneration by activating autophagy, which is induced by the HIF-1α/BNIP3 signaling pathway, and that the inhibition of HIF-1α or autophagy abrogated the protective effect of DMOG, as expected. Taken together, our results demonstrate that treatment with DMOG improves functional recovery after SCI and that DMOG may serve as a potential candidate for treating SCI.
脊髓损伤 (SCI) 是一种破坏性的神经疾病,通常会导致患者丧失运动和感觉功能。缺氧诱导因子-1α (HIF-1α) 的表达增加,并在创伤性 SCI 后发挥保护作用。然而,内源性 HIF-1α 的活性不足以促进功能恢复。本研究测试了脯氨酰羟化酶 (PHD) 抑制剂二甲氧乙二酰甘氨酸 (DMOG) 持续激活 HIF-1α对 SCI 后抗细胞凋亡过程和轴突再生的潜在影响。在这里,我们发现 DMOG 处理显著增加了 HIF-1α 的表达,并且 DMOG 诱导的 HIF-1α 稳定不仅降低了凋亡蛋白的表达以促进神经存活,而且通过调节微管稳定和来增强轴突再生。此外,我们发现 DMOG 通过激活自噬来促进神经存活和轴突再生,自噬是由 HIF-1α/BNIP3 信号通路诱导的,而 HIF-1α 或自噬的抑制消除了 DMOG 的保护作用,正如预期的那样。总之,我们的结果表明,DMOG 治疗可改善 SCI 后的功能恢复,DMOG 可能是治疗 SCI 的潜在候选药物。
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