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巴克斯表达影响出生后视网膜血管发育和过氧敏感度.

Nader Sheibani1, Yanzhi Sang2, Shoujian Wang2

  • 1Department of Ophthalmology and Visual Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA; McPherson Eye Research Institute, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA; Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.

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概括

比姆-巴克斯通路在发育和氧气诱导的缺血视网膜病变期间会去除多余的视网膜内皮细胞,但不会去除视网膜细胞. 需要额外的Bim通路来进行细胞周围细胞的去除.

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科学领域:

  • 眼科医生 眼科 眼科
  • 细胞生物学 细胞生物学
  • 发展生物学 发展生物学

背景情况:

  • 亡对于器官发育和恒温至关重要.
  • Bcl-2家族蛋白通过内在细胞死亡途径调节细胞亡.
  • 比姆激活了Bax/Bak以诱导亡,影响了视网膜血管化和氧气诱导的缺血视网膜病变 (OIR).

研究的目的:

  • 调查巴克斯在视网膜血管发育和OIR中的作用.
  • 确定Bim-Bax通路是否足以进行内皮细胞和细胞周细胞的去除.
  • 阐明是否需要额外的Bim介导途径来实现细胞周周平衡.

主要方法:

  • 在巴克斯淘汰赛 (Bax-/-) 小鼠与野生型 (Bax+/+) 小鼠中对视网膜血管化的比较分析.
  • 在OIR期间,对Bax-/-小鼠的高氧介导血管消灭的评估.
  • 在巴克斯/-和Bim-/-小鼠中的血管表型的比较.

主要成果:

  • 与Bax+/+小鼠相比,Bax-/-视网膜表现出增加的内皮细胞和细胞周数.
  • 缺少Bax显著减少了OIR期间的高氧介导血管消灭.
  • 虽然Bax-/-小鼠的内皮细胞增加与Bim-/-小鼠相似,但细胞周细胞的增加不那么明显,表明部分保护.

结论:

  • 毕姆-巴克斯通路有效地去除多余的视网膜内皮细胞,但在产后发育和OIR期间不会去除皮质细胞.
  • 额外的Bim介导通路对于皮质细胞的去除和减轻高氧引起的血管损伤至关重要.
  • 这突出了Bim在调节内皮细胞与周周细胞中的独特作用.