Methods of MRI-based structural imaging in the aging monkey.

Methods of MRI-based structural imaging in the aging monkey.
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基于 MRI 的衰老猴子结构成像方法。

DOI:
10.1016/j.ymeth.2009.06.007
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发表时间:
2010
期刊:
Methods (San Diego, Calif.)
影响因子:
--
通讯作者:
Rosene,DL
Rosene,DL
中科院分区:
--
文献类型:
--
作者:
Makris,N;Kennedy,DN;Boriel,DL;Rosene,DL

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在有兽医护理的情况下,恒河猴的典型寿命可长达 30 年,但随着年龄的增长,它们的认知能力会下降。虽然皮层神经元大部分保留在大脑皮层中,包括初级运动皮层、视觉皮层以及前额叶联合皮层,但轴突髓磷脂明显分解,白质总体减少,主要发生在额叶和颞叶。确定髓磷脂分解是弥漫性的还是特定于单个白质纤维通路是很重要的。为此,额叶和颞叶内特定额颞叶纤维通路的描绘和量化对于确定哪些结构发生改变以及这些改变与行为发现的相关程度至关重要。利用 MRI 无创地研究活体大脑的能力为结构-功能和解剖-临床关系打开了一个新窗口,允许整合来自同一对象的不同扫描方式的信息。例如,对于大脑中的任何特定体素,我们可以获得基于结构 T1、扩散和磁化转移磁共振成像 (MRI) 的信息。此外,因此可以随着时间的推移纵向跟踪任何观察到的变化。在相同的 MRI 实验环境中采集同一个体的多维数据,将能够为正常衰老的猴子创建一个集成结构 MRI 行为相关性的数据库,以阐明衰老的非人类灵长类动物功能性衰老的潜在神经生物学机制。
Rhesus monkeys, whose typical lifespan can be as long as 30years in the presence of veterinary care, undergo a cognitive decline as a function of age. While cortical neurons are largely preserved in the cerebral cortex, including primary motor and visual cortex as well as prefrontal association cortex there is marked breakdown of axonal myelin and an overall reduction in white matter predominantly in the frontal and temporal lobes. Whether the myelin breakdown is diffuse or specific to individual white matter fiber pathways is important to be known with certainty. To this end the delineation and quantification of specific frontotemporal fiber pathways within the frontal and temporal lobes is essential to determine which structures are altered and the extent to which these alterations correlate with behavioral findings. The capability of studying the living brain non-invasively with MRI opens up a new window in structural–functional and anatomic–clinical relationships allowing the integration of information derived from different scanning modalities in the same subject. For instance, for any particular voxel in the cerebrum we can obtain structural T1-, diffusion- and magnetization transfer- magnetic resonance imaging (MRI) based information. Moreover, it is thus possible to follow any observed changes longitudinally over time. These acquisitions of multidimensional data in the same individual within the same MRI experimental setting would enable the creation of a data base of integrated structural MRI-behavioral correlations for normal aging monkeys to elucidate the underlying neurobiological mechanisms of functional senescence in the aging non-human primate.
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