在缺乏P-和E-选择素的小鼠中对感染的敏感性和血液形成的改变
P S Frenette1, T N Mayadas, H Rayburn
1Center for Blood Research, Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Cell
|February 23, 1996
概括
缺乏内皮P-和E-选择因的小鼠表现出严重的免疫缺陷,包括极端白细胞症和对细菌感染的易感性. 这些发现凸显了内皮选择素在白细胞平衡中的关键作用.
科学领域:
- 免疫学 免疫学 免疫学
- 血液学 血液学 血液学
- 细胞生物学 细胞生物学
背景情况:
- 内皮选择蛋白 (P-选择蛋白和E-选择蛋白) 介导白细胞初始粘附到内皮.
- 缺少单个selectin基因的小鼠表现出轻度的表型.
- 内皮选择素在白细胞平衡中的综合作用尚未完全理解.
研究的目的:
- 为了研究缺乏P-和E-选择因的小鼠的体内表型.
- 评估内皮细胞选择因缺乏对白细胞平衡和免疫反应的影响.
主要方法:
- 序列基因切除以创建P-和E-selectin基因的双淘汰赛小鼠.
- 现型分析包括血细胞计数,细胞因子分析和血液形成评估.
- 评估白细胞招募和对细菌感染的易感性.
主要成果:
- 双击的小鼠表现出极端的白细胞分裂和高水平的细胞因子.
- 血液形成的显著变化,包括增加的颗粒细胞形成和 erythropoiesis.
- 炎症部位的白细胞滚动和扩散受损导致对机会性细菌感染的易感性.
结论:
- 缺少内皮P-和E-选择素严重破坏白细胞平衡.
- 这些选择蛋白对白细胞正常功能至关重要,其重要性与白细胞β2整合蛋白相当.
- 内皮选择蛋白在对抗细菌病原体的宿主防御中起着至关重要的作用.
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