Attention-deficit hyperactivity disorder (ADHD) is a common childhood psychiatric disorder. Despite intensive research efforts, the aetiology of ADHD remains unknown. Current evidence suggests that the aetiology of ADHD is heterogeneous, comprising of multiple factors. Recently, it has been proposed that brain-derived neurotrophic factor (BDNF), a member of the neurotrophic factor family, may be implicated in the pathogenesis of ADHD. This hypothesis is supported by recent genetic studies in ADHD. Drawing on findings from studies into the drugs for ADHD relating to central BDNF expression, hyperactivity in BDNF knockout mice, BDNF effects in midbrain dopaminergic function and the close association between BDNF and the dopamine transporter (an important molecule for ADHD pathogenesis), it is proposed here that decreased central BDNF, particularly in the midbrain region, may play an important role in the pathogenesis ADHD. This hypothesis may have some implications for clinical findings in ADHD (for example, the co-morbidity between ADHD and major depression), and provide a new direction for the development of medication for ADHD treatment.

译文

注意力缺陷多动障碍 (ADHD) 是一种常见的儿童精神疾病。尽管进行了大量研究,但ADHD的病因仍然未知。目前的证据表明,ADHD的病因是异质的,由多种因素组成。最近,有人提出,神经营养因子家族的成员脑源性神经营养因子 (BDNF) 可能与ADHD的发病机理有关。该假设得到了ADHD最近的遗传研究的支持。根据对ADHD药物的研究结果,该药物与中枢BDNF表达,BDNF基因敲除小鼠的活动过度,BDNF在中脑多巴胺能功能中的作用以及BDNF与多巴胺转运蛋白 (ADHD发病机理的重要分子) 之间的密切联系有关,在这里提出降低中枢BDNF,特别是在中脑区域,可能在ADHD的发病机理中起重要作用。该假设可能对ADHD的临床发现 (例如,ADHD与重度抑郁症之间的合并症) 具有一定的意义,并为ADHD治疗药物的发展提供了新的方向。

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