缺氧期间内皮αvβ3整合素的诱导保护了血脑屏障的完整性
Sebok K Halder1, Violaine D Delorme-Walker1, Richard Milner1
1San Diego Biomedical Research Institute, San Diego, CA 92121.
概括
在老年小鼠中,阻断αvβ3整体蛋白在缺氧期间恶化血脑屏障 (BBB) 损伤. 这表明αvβ3整合素通常会保护BBB,为血管痴呆症提供潜在的治疗点.
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
- 集成的信号传输.
背景情况:
- 血脑屏障 (BBB) 保持大脑健康,但其与年龄相关的衰退有助于血管痴呆.
- 整合素相互作用是血管稳定性的关键,其中αvβ3整合素是由大脑内皮细胞中缺氧引起的.
- 在低氧压力下,αvβ3整合素在BBB完整性方面的特定作用尚不清楚.
研究的目的:
- 调查αvβ3整合素在年轻和老年小鼠缺氧期间对血脑屏障 (BBB) 完整性的影响.
- 为了确定αvβ3整基因抑制是否加剧或防止BBB破坏.
主要方法:
- 使用年轻和老年小鼠暴露在受控低氧条件下 (8% O2).
- 管理功能阻断β3整体抗体和抑制性基提德.
- 通过使用MECA-32和紧结蛋白等标记物来评估BBB破坏.
- 检查了β3整合素零小鼠和体外脑内皮细胞模型.
主要成果:
- 在老年小鼠中,β3整蛋白的低毒诱导显著更强.
- 抑制β3整合素显著放大了BBB破坏,减少了紧结蛋白,并在两个年龄组中增加了MECA-32表达.
- 在β3整合素无基因小鼠中,呈现出高氧诱导的BBB干扰.
- 在体外,西伦吉提德损害了内皮单层完整性,降低了VE-cadherin和紧结蛋白表达.
结论:
- 内皮αvβ3整体素的低毒诱导似乎通过稳定内皮粘附来增强BBB完整性.
- 在低氧条件下,αvβ3整合素的抑制会使BBB中断恶化.
- 有针对性的αvβ3整合素上调可能为与年龄相关的BBB功能障碍和血管痴呆症提供治疗策略.
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