Why is methylphenidate effective in ADHD

Kohji Sato
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引用次数: 1

Abstract

Attention deficit hyperactivity disorder (ADHD) is one of the most prevalent neurobehavioral disorders. Methylphenidate (MPH) is a psychostimulant widely used for the treatment of ADHD. MPH is an inhibitor of dopamine transporter (DAT), and increases dopamine (DA) levels by inhibiting dopamine uptakes in patient brains. On the other hand, the involvement of NMDA type glutamate receptors (NMDARs) in the pathogenesis of ADHD has been also postulated. Magnetic resonance spectroscopy (MRS) study showed a decrease of combined glutamate/glutamine to creatinine ratio in the right anterior cingulated cortex in ADHD adults. In addition, a NMDA subunit gene polymorphism (GRIN2B rs2284411) has been reported to be an important predictor of MPH response in ADHD. Taken together, NMDAR functions are somehow disturbed in ADHD. However, the relationship between the increment of dopamine levels and the improvement of NMDAR functions is largely unknown. Recently, Shibasaki et al. have reported that DA Journal of Brain Science, January 25, 2018,Vol.48 6 causes a functional reversal of glycine transporter 1 (GlyT1), causing astrocytes to release glycine. Glycine is a very important co-agonist for NMDARs and plays a role in treating ADHD by modulating the glutamatergic neurotransmission system through activating NMDARs. Thus, I postulate the following hypothesis. MPH blocks DAT and increases dopamine levels. The increment of dopamine levels activates astrocyte to release glycine. The increment of glycine levels improves NMDAR functions, resulting in improvement of ADHD. Key wards: ADHD, dopamine, glycine, glycine transporter
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为什么哌甲酯对ADHD有效
注意缺陷多动障碍(ADHD)是最常见的神经行为障碍之一。哌醋甲酯(MPH)是一种广泛用于治疗多动症的精神兴奋剂。MPH是多巴胺转运体(DAT)的抑制剂,通过抑制患者大脑中多巴胺的摄取来增加多巴胺(DA)水平。另一方面,NMDA型谷氨酸受体(NMDARs)参与ADHD的发病机制也被假设。磁共振波谱(MRS)研究显示ADHD成人右侧前扣带皮层谷氨酸/谷氨酰胺/肌酐比值降低。此外,NMDA亚基基因多态性(GRIN2B rs2284411)已被报道为ADHD患者MPH反应的重要预测因子。综上所述,ADHD患者的NMDAR功能在某种程度上受到了干扰。然而,多巴胺水平的增加与NMDAR功能的改善之间的关系在很大程度上是未知的。最近,Shibasaki等人报道了DA脑科学杂志,2018年1月25日,卷。48 6导致甘氨酸转运蛋白1 (GlyT1)功能逆转,导致星形胶质细胞释放甘氨酸。甘氨酸是一种非常重要的NMDARs协同激动剂,通过激活NMDARs调节谷氨酸能神经传递系统,起到治疗ADHD的作用。因此,我提出以下假设。MPH阻断了DAT并增加了多巴胺水平。多巴胺水平的增加激活星形胶质细胞释放甘氨酸。甘氨酸水平的增加可改善NMDAR功能,从而改善ADHD。关键词:ADHD,多巴胺,甘氨酸,甘氨酸转运体
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