双光子显微镜技术下胶质瘤-壁细胞荧光活体基因小鼠模型的建立及应用
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中国医学科学院医学实验动物研究所 北京协和医学院比较医学中心

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国家重点研发计划(2022YFF0710700)


The establishment and utilization of a fluorescent living genetically engineered mouse model of glioma-mural cells using a two-photon microscope
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Institute of Laboratory Animal Science (CAMS),Comparative Medicine Center,Peking Union Medical College (PUMC)

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The National Key Research and Development Program of China (2022YFF0710705)

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    摘要:

    目的 建立双光子显微镜下可视化胶质瘤、壁细胞和血管的活体自发荧光的基因小鼠模型并进行评价。 方法 以PDGFRβ-Cre(+/-):Rosa26-tdTomato(+/-)基因工程小鼠为观察壁细胞和血管结构的载体,接种GL261-CFP小鼠胶质瘤细胞并对颅骨进行透明化,通过双光子显微镜动态跟踪观察胶质瘤增殖侵袭过程中血管与壁细胞的动态变化。 结果 通过基因鉴定证实PDGFRβ-Cre(+/-):Rosa26-tdTomato(+/-)基因工程小鼠成功繁育。对比C57BL/6小鼠,基因工程小鼠的形态外观和繁殖等无差异,组织HE切片分析显示脏器发育无异常。Tamoxifen诱导下基因工程小鼠的Cre重组酶活性至第7天作用完全。接种GL261-CFP后观察到胶质瘤增殖侵袭的动态过程及肿瘤内血管形态结构紊乱、壁细胞游离增多。 结论 成功构建了荧光可视化壁细胞的基因工程小鼠,分别利用异硫氰酸荧光素-葡聚糖标记血管和青色荧光标记肿瘤细胞,使用玻璃圆片与固定环替代小鼠颅骨,实现了活体状态下长期稳定地动态跟踪小鼠接种脑肿瘤后血管及血管支持细胞的形态结构变化,为研究脑胶质瘤提供了病理可视化的动物模型。

    Abstract:

    Objective The aim of this study was to develop and assess a genetically engineered mouse model for visualizing in vivo fluorescence of glioma, mural cells, and blood vessels using two-photon microscopy. Methods PDGFRβ-Cre(+/-):Rosa26-tdTomato(+/-) genetically engineered mice were underwent skull clearance and injected with GL261-CFP. This was done to study the dynamic alterations in blood vessels and mural cells during the progression and invasion of glioma using a two-photon microscope. Results PDGFRβ-Cre(+/-):Rosa26-tdTomato(+/-) mice were successfully bred and subjected to HE section analysis of functional organ tissues, revealing no discernible differences from C57BL/6 mice in terms of appearance and morphology. Cre recombinase activity was fully induced following Tamoxifen treatment on day 7. Subsequent GL261-CFP inoculation demonstrated the dynamic progression of glioma proliferation and invasion, as well as vascular abnormalities and increased mural cell detachment within the tumor. Conclusions The genetically engineered mice that mural cell expressing fluorescent were bred successfully. Utilizing fluorescein isothiocyanate-dextran labeling of blood vessels and blue fluorescent tumor cells, glass discs and fixed rings were employed to replace the skull of the mice. This allowed for the tracking of morphological and structural changes in blood vessels and vascular supporting cells following the development of brain tumors in vivo over an extended period. This model offers a valuable tool for studying brain diseases through pathological visualization.

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  • 收稿日期:2024-03-13
  • 最后修改日期:2024-05-23
  • 录用日期:2024-06-11
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