Gray matter volume reduction in rostral middle frontal gyrus in patients with chronic schizophrenia.

Gray matter volume reduction in rostral middle frontal gyrus in patients with chronic schizophrenia.
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DOI:
10.1016/j.schres.2010.07.027
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发表时间:
2010-11
影响因子:
4.5
通讯作者:
Shenton, M. E.
Shenton, M. E.
中科院分区:
医学2区
文献类型:
--
作者:
Kikinis, Z.;Fallon, J. H.;Niznikiewicz, M.;Nestor, P.;Davidson, C.;Bobrow, L.;Pelavin, P. E.;Fischl, B.;Yendiki, A.;McCarley, R. W.;Kikinis, R.;Kubicki, M.;Shenton, M. E.

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背外侧前额叶皮层(DLPFC)是在精神分裂症和工作记忆研究中占据重要地位的一个大脑区域,但该大脑区域的确切神经解剖学定位仍有待确定。 DLPFC 主要涉及额上回和额中回(MFG)。然而,后者并不是一个单一的神经解剖学实体,而是由喙部(前部、中部和后部)和尾部区域组成。在这项研究中,我们使用结构 MRI 开发了一种将 MFG 分割为其组成部分的方法。我们关注 DLPFC 的这个区域,因为它包括 BA46,一个涉及工作记忆的区域。我们评估了 20 名慢性精神分裂症患者和 20 名健康对照者 MFG 的体积差异。使用源自 BA46 细胞结构定义的前部和后部神经解剖学标志在中部 MFG (MR-MFG) 内描绘出中部 MFG。然后比较各组之间 MR-MFG 的灰质体积,观察到灰质体积显着减少 (p<0.008),但 MFG 的其他区域(即前或后喙 MFG,或 MFG 尾部区域)没有显着减少。我们的结果表明,MFG 灰质的体积变化仅局限于 MR-MFG。皮质表面的 3D 重建使得追踪 MFG 进入其前部成为可能,而其他方法却失败了。这种分割方法提供了一种更精确的测量 MR-MFG 的方法,这对于进一步记录精神分裂症 DLPFC 异常可能很重要。
The dorsolateral prefrontal cortex (DLPFC) is a brain region that has figured prominently in studies of schizophrenia and working memory, yet the exact neuroanatomical localization of this brain region remains to be defined. DLPFC primarily involves the superior frontal gyrus and middle frontal gyrus (MFG). The latter, however is not a single neuroanatomical entity but instead is comprised of rostral (anterior, middle, and posterior) and caudal regions. In this study we used structural MRI to develop a method for parcellating MFG into its component parts. We focused on this region of DLPFC because it includes BA46, a region involved in working memory. We evaluated volume differences in MFG in 20 patients with chronic schizophrenia and 20 healthy controls. Mid-rostral MFG (MR-MFG) was delineated within the rostral MFG using anterior and posterior neuroanatomical landmarks derived from cytoarchitectonic definitions of BA46. Gray matter volumes of MR-MFG were then compared between groups, and a significant reduction in gray matter volume was observed (p<0.008), but not in other areas of MFG (i.e., anterior or posterior rostral MFG, or caudal regions of MFG). Our results demonstrate that volumetric alterations in MFG gray matter are localized exclusively to MR-MFG. 3D reconstructions of the cortical surface made it possible to follow MFG into its anterior part, where other approaches have failed. This method of parcellation offers a more precise way of measuring MR-MFG that will likely be important in further documentation of DLPFC anomalies in schizophrenia.
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