Downregulation of oligodendrocyte transcripts is associated with impaired prefrontal cortex function in rats.

Downregulation of oligodendrocyte transcripts is associated with impaired prefrontal cortex function in rats.
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DOI:
10.1016/j.schres.2009.05.023
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发表时间:
2009-09
影响因子:
4.5
通讯作者:
Konradi, Christine
Konradi, Christine
中科院分区:
医学2区
文献类型:
--
作者:
Gregg, Justin R.;Herring, Nicole R.;Naydenov, Alipi V.;Hanlin, Ryan P.;Konradi, Christine

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脑白质和少突胶质细胞的异常是精神分裂症(Sz)研究中最一致的发现之一。对死后Sz脑的各种基因表达微阵列研究显示,髓鞘转录下调,而成像和显微镜研究显示,前额叶皮质(PFC)白质体积和少突胶质细胞密度减少。目前,减少的少突胶质细胞标志物对Sz的病理生理学区域的贡献程度尚不清楚。我们将青春期大鼠暴露于铜络合剂(CPZ),这是一种已知会导致小鼠脱髓鞘的铜络合剂,并检测了少突胶质细胞mRNA转录本的表达和PFC介导的行为。CPZ饮食的大鼠显示,编码少突胶质细胞蛋白的mRNAs在前额叶内侧的表达减少,但在海马区或纹状体没有表达。这些大鼠还在注意定势转移任务中的知觉维度之间的转换能力方面表现出特定的缺陷,注意定势转移任务是一种以威斯康星卡片分类测试(WCST)为模型的PFC介导的行为范式。无法改变策略与WCST中的SZ患者表现出的缺陷相对应。结果表明,少突胶质细胞标志物的减少与PFC介导的行为受损有关。因此,暴露于CPZ的大鼠可以作为一种模型来检验少突胶质细胞的扰动对Sz区观察到的认知缺陷的贡献。
Abnormalities of brain white matter and oligodendroglia are among the most consistent findings in schizophrenia (Sz) research. Various gene expression microarray studies of postmortem Sz brains showed a downregulation of myelin transcripts, while imaging and microscopy studies demonstrated decreases in prefrontal cortical (PFC) white matter volume and oligodendroglia density. Currently, the extent to which reduced oligodendrocyte markers contribute to pathophysiological domains of Sz is unknown. We exposed adolescent rats to cuprizone (CPZ), a copper chelator known to cause demyelination in mice, and examined expression of oligodendrocyte mRNA transcripts and PFC-mediated behavior. Rats on the CPZ diet showed decreased expression of mRNA transcripts encoding oligodendroglial proteins within the medial PFC, but not in the hippocampus or the striatum. These rats also displayed a specific deficit in the ability to shift between perceptual dimensions in the attentional set-shifting task, a PFC-mediated behavioral paradigm modeled after the Wisconsin Card Sorting Test (WCST). The inability to shift strategies corresponds to the deficits exhibited by Sz patients in the WCST. The results demonstrate that a reduction in oligodendrocyte markers is associated with impaired PFC-mediated behaviors. Thus, CPZ exposure of rats can serve as a model to examine the contribution of oligodendrocyte perturbation to cognitive deficits observed in Sz.
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