In vivo three-photon microscopy of subcortical structures within an intact mouse brain.

In vivo three-photon microscopy of subcortical structures within an intact mouse brain.
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DOI:
10.1038/nphoton.2012.336
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发表时间:
2013-03-01
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影响因子:
35
通讯作者:
--
中科院分区:
物理与天体物理1区
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--
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双光子荧光显微镜(2PM)使包括神经科学,胚胎学和肿瘤学在内的各个领域的科学家能够在散射组织深处的细胞水平上可视化体内和体外组织形态和生理学。然而,组织散射限制了小鼠大脑内2PM的最大成像深度到皮质层,并且对皮质下结构进行成像目前需要去除覆盖的脑组织或插入光学探针。在这里,我们展示了非侵入性的,高分辨率的,在一个完整的小鼠大脑皮质下结构的体内成像使用三光子荧光显微镜(3 PM)在光谱激发窗口为1,700 nm。对小鼠海马内的血管结构以及红色荧光蛋白(RFP)标记的神经元进行成像。长激发波长和高阶非线性激发的组合克服了2PM的限制,使得生物学研究能够在组织内更深的地方进行。
Two-photon fluorescence microscopy (2PM) enables scientists in various fields including neuroscience, embryology, and oncology to visualize in vivo and ex vivo tissue morphology and physiology at a cellular level deep within scattering tissue. However, tissue scattering limits the maximum imaging depth of 2PM within the mouse brain to the cortical layer, and imaging subcortical structures currently requires the removal of overlying brain tissue or the insertion of optical probes. Here we demonstrate non-invasive, high resolution, in vivo imaging of subcortical structures within an intact mouse brain using three-photon fluorescence microscopy (3PM) at a spectral excitation window of 1,700 nm. Vascular structures as well as red fluorescent protein (RFP)-labeled neurons within the mouse hippocampus are imaged. The combination of the long excitation wavelength and the higher order nonlinear excitation overcomes the limitations of 2PM, enabling biological investigations to take place at greater depth within tissue.
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