Inhibition of mediodorsal thalamus disrupts thalamofrontal connectivity and cognition.

Inhibition of mediodorsal thalamus disrupts thalamofrontal connectivity and cognition.
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DOI:
10.1016/j.neuron.2013.01.038
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发表时间:
2013-03-20
期刊:
影响因子:
16.2
通讯作者:
Kellendonk C
Kellendonk C
中科院分区:
医学1区
文献类型:
--
作者:
Parnaudeau S;O'Neill PK;Bolkan SS;Ward RD;Abbas AI;Roth BL;Balsam PD;Gordon JA;Kellendonk C

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认知缺陷是精神分裂症的核心,但其潜在机制仍不清楚。在患者中进行的成像研究指出,中背丘脑(MD)的活动减少,MD和前额叶皮层(PFC)之间的功能连接减少是候选机制。然而,因果关系仍然缺失。我们在小鼠中使用药物遗传学方法来减少MD神经元活动,并检查行为和生理后果。我们发现MD活动的轻微减少足以引发前额叶依赖性认知任务中的选择性损伤。在行为动物的体内记录显示,MD-PFC β-范围的同步性增强,在收购和性能的工作记忆任务。减少MD活动干扰这种任务依赖性调制MD-PFC同步,这与受损的工作记忆。这些发现表明,改变MD活动足以破坏前额叶依赖性认知行为,并可能有助于在精神分裂症中观察到的认知症状。
Cognitive deficits are central to schizophrenia but the underlying mechanisms still remain unclear. Imaging studies performed in patients point to decreased activity in the medio-dorsal thalamus (MD) and reduced functional connectivity between the MD and prefrontal cortex (PFC) as candidate mechanisms. However, a causal link is still missing. We used a pharmacogenetic approach in mice to diminish MD neuron activity and examined the behavioral and physiological consequences. We found that a subtle decrease in MD activity is sufficient to trigger selective impairments in prefrontal-dependent cognitive tasks. In vivo recordings in behaving animals revealed that MD-PFC beta-range synchrony is enhanced during acquisition and performance of a working memory task. Decreasing MD activity interfered with this task-dependent modulation of MD-PFC synchrony, which correlated with impaired working memory. These findings suggest that altered MD activity is sufficient to disrupt prefrontal-dependent cognitive behaviors, and could contribute to the cognitive symptoms observed in schizophrenia.
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