达巴非尼通过上调 Axl 受体减轻实验性自身免疫性脑脊髓炎中铁死亡引起的神经炎症。
Dabrafenib mitigates the neuroinflammation caused by ferroptosis in experimental autoimmune encephalomyelitis by up regulating Axl receptor.
机构信息
Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, China.
Department of general Surgery, the Second Affiliated Hospital of Lanzhou University, Lanzhou, 730030, China; The First Dongguan Affiliated Hospital of Guangdong Medical University, Dongguan, 523000, China.
出版信息
Eur J Pharmacol. 2024 Jun 15;973:176600. doi: 10.1016/j.ejphar.2024.176600. Epub 2024 Apr 19.
Multiple sclerosis is an autoimmune disease that causes inflammatory damage to the central nervous system. At present, the pathogenesis of the disease is unknown. There is a lack of few effective therapy medications available. Therefore, it is necessary to further explore the pathogenesis of this illness and develop potential therapeutic drugs. Dabrafenib is potential therapeutic medicine for nervous system disease. In this study, we preliminarily studied the possible mechanism of dabrafenib in the treatment of multiple sclerosis from the perspective of ferroptosis. First, we observed that dabrafenib significantly improved symptoms of gait abnormalities, limb weakness or paralysis, and down-regulated levels of spinal cord inflammation in an experimental autoimmune encephalitis (EAE) model. Meanwhile, we also observed that dabrafenib could inhibit the proteins of ferroptosis in spinal cord tissue of EAE mice by Western blot. The results of immunohistochemical analysis showed that the effect of dabrafenib on ferroptosis mainly occurred in microglia. Second, dabrafenib was demonstrated to be able to inhibit the S phase of the cell cycle, reduce ROS levels, and reinstate mitochondrial activity in the LPS-induced BV2 inflammatory cell model. Futhermore, we found that dabrafenib inhibits P-JAK2 and P-STAT3 activation by acting Axl receptor, which in turn prevents neurogenic inflammation in microglia. The co-stimulated BV2 cell model with LPS and Erastin also verified these findings. Ultimately, the Axl knockout mice used to construct the EAE model allowed for the confirmation that dabrafenib prevented ferroptosis in microglia by up-regulating Axl receptor, which reduced the inflammatory demyelination associated with EAE. In summary, our research demonstrates the advantages of dabrafenib in multiple sclerosis treatment, which can prevent ferroptosis in microglia in multiple sclerosis through up-regulating Axl receptor, thus halting the progression of multiple sclerosis.
多发性硬化症是一种自身免疫性疾病,可导致中枢神经系统炎症损伤。目前,该疾病的发病机制尚不清楚。有效的治疗药物也很少。因此,有必要进一步探讨这种疾病的发病机制,并开发潜在的治疗药物。达拉非尼是一种治疗神经系统疾病的潜在治疗药物。在这项研究中,我们初步从铁死亡的角度探讨了达拉非尼治疗多发性硬化症的可能机制。首先,我们观察到达拉非尼在实验性自身免疫性脑脊髓炎(EAE)模型中显著改善了步态异常、四肢无力或瘫痪的症状,并下调了脊髓炎症水平。同时,我们还观察到达拉非尼可以通过 Western blot 抑制 EAE 小鼠脊髓组织中的铁死亡蛋白。免疫组化分析的结果表明,达拉非尼对铁死亡的作用主要发生在小胶质细胞中。其次,达拉非尼被证明能够抑制细胞周期的 S 期,降低 ROS 水平,并恢复 LPS 诱导的 BV2 炎症细胞模型中的线粒体活性。此外,我们发现达拉非尼通过作用于 Axl 受体抑制 P-JAK2 和 P-STAT3 的激活,从而防止小胶质细胞中的神经原性炎症。LPS 和 Erastin 共刺激的 BV2 细胞模型也验证了这些发现。最终,用于构建 EAE 模型的 Axl 敲除小鼠证实,达拉非尼通过上调 Axl 受体防止小胶质细胞中的铁死亡,从而减少与 EAE 相关的炎症性脱髓鞘。总之,我们的研究表明达拉非尼在多发性硬化症治疗中的优势,它可以通过上调 Axl 受体防止多发性硬化症中小胶质细胞的铁死亡,从而阻止多发性硬化症的进展。