Garcia-Gomara M, Juan-Palencia A, Alfaro M, Cuadrado-Tejedor M, Garcia-Osta A
Gene Therapy for CNS Disorders Program, Center for Applied Medical Research (CIMA), University of Navarra, Pamplona, Spain.
IdiSNA (Navarra Institute for Health Research), Pamplona, Spain.
J Neuroimmune Pharmacol. 2024 Dec 14;20(1):2. doi: 10.1007/s11481-024-10164-4.
Parkinson's disease (PD) is characterized by the progressive loss of dopaminergic neurons in the substantia nigra that primarily affects movement control. Neuroinflammation plays a pivotal role in driving the disease's progression. The persistent inflammatory state in the brain exacerbates neuronal damage, creating a cycle that perpetuates the neurodegenerative process. Glucocorticoids, such as dexamethasone, have potent anti-inflammatory properties and have been studied for their neuroprotective potential in different neurodegenerative diseases. However, their specific impact on PD remains unclear. This study aimed to evaluate the impact of dexamethasone on a neuromelanin (NM)-driven model of PD. We demonstrated that dexamethasone administration significantly improved motor function and preserved dopaminergic neuron compared to untreated controls in our study. These neuroprotective effects were mediated, at least in part, by suppressing reactive microglia and reducing the infiltration of peripheral immune cells into the brain. Our findings underscore the potential therapeutic benefits of dexamethasone in mitigating neuroinflammation and maintaining neuronal integrity in a NM-driven model of PD. These results advocate for further investigation into glucocorticoid-based therapies as adjunctive treatments for PD, particularly in scenarios where neuroinflammation contributes prominently to disease progression.
帕金森病（PD）的特征是黑质中多巴胺能神经元的渐进性丧失，主要影响运动控制。神经炎症在推动疾病进展中起关键作用。大脑中持续的炎症状态会加剧神经元损伤，形成一个使神经退行性过程持续下去的循环。糖皮质激素，如地塞米松，具有强大的抗炎特性，并已针对其在不同神经退行性疾病中的神经保护潜力进行了研究。然而，它们对PD的具体影响仍不清楚。本研究旨在评估地塞米松对神经黑色素（NM）驱动的PD模型的影响。我们证明，在我们的研究中，与未治疗的对照组相比，给予地塞米松显著改善了运动功能并保留了多巴胺能神经元。这些神经保护作用至少部分是通过抑制反应性小胶质细胞和减少外周免疫细胞向大脑的浸润来介导的。我们的研究结果强调了地塞米松在减轻NM驱动的PD模型中的神经炎症和维持神经元完整性方面的潜在治疗益处。这些结果主张进一步研究基于糖皮质激素的疗法作为PD的辅助治疗，特别是在神经炎症对疾病进展有显著贡献的情况下。
