Concurrent Administration of Neu2000 and Lithium Produces Marked Improvement of Motor Neuron Survival, Motor Function, and Mortality in a Mouse Model of Amyotrophic Lateral Sclerosis
作者:Jin Hee Shin、Sung Ig Cho、Hyang Ran Lim、Jae Keun Lee、Young Ae Lee、Jai Sung Noh、In Soo Joo、Kee-Won Kim、Byoung Joo Gwag
DOI:10.1124/mol.106.030676
日期:2007.4
The Fas pathway and oxidative stress mediate neuronal death in stroke and may contribute to neurodegenerative disease. We tested the hypothesis that these two factors synergistically produce spinal motor neuron degeneration in amyotrophic lateral sclerosis (ALS). Levels of reactive oxygen species were increased in motor neurons from ALS mice compared with wild-type mice at age 10 weeks, before symptom onset. The proapoptotic proteins Fas, Fas-associated death domain, caspase 8, and caspase 3 were also elevated. Oral administration of 2-hydroxy-5-(2,3,5,6-tetrafluoro-4-trifluoromethyl-benzylamino)-benzoic acid (Neu2000), a potent antioxidant, blocked the increase in reactive oxygen species but only slightly reduced activation of proapoptotic proteins. Administration of lithium carbonate (Li+), a mood stabilizer that prevents apoptosis, blocked the apoptosis machinery without preventing oxidative stress. Neu2000 or Li+ alone significantly enhanced survival time and motor function and together had an additive effect. These findings provide evidence that jointly targeting oxidative stress and Fas-mediated apoptosis can prevent neuronal loss and motor dysfunction in ALS.
Fas通路和氧化应激介导中风中的神经元死亡,并可能促进神经退行性疾病。我们检验了这两个因素协同导致肌萎缩侧索硬化症(ALS)中脊髓运动神经元退化的假设。在症状出现之前,10周大的ALS小鼠的运动神经元中反应性氧种水平与野生型小鼠相比有所增加。促凋亡蛋白Fas、Fas相关死亡结构域、胱蛋白酶8和胱蛋白酶3的水平也有所升高。口服给药2-羟基-5-(2,3,5,6-四氟-4-(三氟甲基)苄氨基)苯甲酸(Neu2000),一种强效抗氧化剂,阻止了反应性氧种的增加,但仅稍微减少了促凋亡蛋白的活化。给药碳酸锂(Li+),一种防止凋亡的情绪稳定剂,阻止了凋亡机制,但并未防止氧化应激。单独使用Neu2000或Li+显著延长了生存时间和运动功能,两者联合使用则有增强的效果。这些发现提供了证据,表明联合针对氧化应激和Fas介导的凋亡可以防止ALS中的神经元丧失和运动功能障碍。