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在成年小鼠中,细胞切除会导致低活性和反应性化
Jake M Cashion1, Lachlan S Brown1, Gary P Morris1
1Tasmanian School of Medicine, College of Health and Medicine, University of Tasmania, Hobart, Tasmania, Australia.
Brain, behavior, and immunity
|October 15, 2024
概括
在成年小鼠中,脑细胞损失会损害运动功能,并导致行为变化. 这种细胞周细胞功能障碍导致神经元缺氧增加,血脑屏障破坏和质反应,突出显示它们在大脑健康中的关键作用.
科学领域:
- 神经科学是一个神经科学.
- 血管生物学 血管生物学
- 细胞生物学 细胞生物学
背景情况:
- 毛细管周细胞调节关键的大脑功能,包括血流,血脑屏障 (BBB) 完整性和神经炎症.
- 细胞损失或功能障碍是许多神经疾病的特征,但其直接影响很难分离.
- 了解皮细胞损失的具体后果对于开发向疗法至关重要.
研究的目的:
- 直接评估成年细胞体损失对小鼠行为和生理大脑反应的影响.
- 为了建立一个剂量依赖的关系,介细胞除水平和观察到的结果.
- 为了研究皮质细胞损失对运动功能,BBB完整性,神经元缺氧和质激活的影响.
主要方法:
- 使用的Pdgfrβ-CreERT2:Rosa26-DTA转基因小鼠通过托莫西芬的使用来进行可诱导和剂量依赖的细胞膜切除.
- 施用不同剂量的他莫西芬 (100mg/kg或2x300mg/kg) 来实现差异性细胞周损失 (∼50%或>80%).
- 使用开放场测试和光束行走任务评估行为变化. 进行了基因病理学分析,以评估BBB完整性,神经元缺氧和质反应性 (星病,微病/巨细胞透).
主要成果:
- 剂量依赖的细胞膜切除得到证实,在较高的他莫西芬剂量下达到>80%的损失.
- 显著失去细胞周细胞的小鼠表现出运动功能受损,包括行驶距离减少,不移性增加,以及在梁行走时更频繁的滑倒.
- 组织学分析显示,血管膜宽度增加,轻微的BBB干扰,神经氧,星病,并增加IBA1+免疫活性在细胞被剥离的大脑.
结论:
- 成年人皮质细胞损失直接影响大脑的健康和功能.
- 细胞缺乏导致小鼠显著的行为改变和运动缺陷.
- 这些发现强调了细胞在维持大脑平衡中的关键作用,并表明它们的功能障碍是神经功能障碍的直接贡献者.
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