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The Met-genotype of the BDNF Val66Met polymorphism is associated with reduced Stroop interference in elderly

机译:BDNF Val66Met多态性的Met基因型与老年人Stroop干扰减少有关

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摘要

Aging is accompanied by impairments of executive functions that rely on the functional integrity of fronto-striatal networks. This integrity is modulated by the release of neurotrophins like the brain-derived-neurotrophic factor (BDNF). Here, we investigate effects of the functional BDNF Val66Met polymorphism on interference processing in 131 healthy elderly subjects using event-related potentials (ERPs). In a Stroop task, participants had to indicate the name or the colour of colour-words while colour was either compatible or incompatible with the name. We show that susceptibility to Stroop-interference is affected by the BDNF Val66Met polymorphism: the Met-allele carriers showed better performance and enhanced N450 in interference trials. Other processes necessary to prepare and allocate cognitive resources to a particular task were not affected by BDNF Val66Met polymorphism, underlining the specificity of the observed effects. The observed performance and ERP difference is possibly due to dopamine related effects of BDNF in fronto-striatal networks, where it putatively mediates a shift in the balance of the direct and indirect pathway involved in inhibitory functions.
机译:衰老伴随着依赖额纹状体网络功能完整性的执行功能的损害。这种完整性受到神经营养因子(如脑源性神经营养因子(BDNF))释放的调节。在这里,我们调查功能性BDNF Val66Met多态性对131名使用事件相关电位(ERP)的健康老年受试者的干扰加工的影响。在Stroop任务中,参与者必须指出颜色单词的名称或颜色,而颜色与该名称兼容或不兼容。我们表明,对Stroop干扰的敏感性受BDNF Val66Met多态性的影响:Met等位基因携带者在干扰试验中表现出更好的性能并增强了N450。为特定任务准备和分配认知资源所需的其他过程不受BDNF Val66Met多态性的影响,这突显了观察到的效应的特异性。观察到的性能和ERP差异可能归因于额叶纹状体网络中BDNF的多巴胺相关作用,它推测介导抑制功能涉及的直接途径和间接途径平衡的变化。

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