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• W957001408 abstract "AIM: To observe the protein expression of angiopoietin-1 (Ang-1) and angiopoietin-2 (Ang-2) after hemorrhagic shock, and to explore the role of this difference in the development of the biphasic change of vascular reactivity after hemorrhagic shock in rats. METHODS: The vascular reactivity of the first class arborization of superior mesenteric artery (SMA) and protein expression of Ang-1 and Ang-2 after hemorrhagic shock were measured via the isolated organ perfusion system and Western blotting technique. The relationship between the protein expression of Ang-1/Ang-2 and the vascular reactivity after hemorrhagic shock was observed. By treatment with Ang-1 and Ang-2 or inhibition of Ang-1 and Ang-2, the effects of angiopoietins on the vascular reactivity of SMA in the early stage (hyperreactivi-ty) and late period (hyporeactivity) of hypoxia were observed to analyze the role of the differential expression of Ang-1 and Ang-2 protein in the biphasic change of vascular reactivity after hemorrhagic shock. RESULTS: (1) The vascular reactivity of SMA showed a biphasic change following hemorrhagic shock, which was increased in the early stage of shock, and decreased in prolonged stage. The E(subscript max) of norepinephrin in the shock 10 min group was the highest (129.3% of normal control, P＜0.01). The protein expression of Ang-1 in SMA was also increased in the early stage of shock, decreased at prolonged stage of shock, and topped at 10 min shock group (1.85 folds of normal control, P＜0.01). The protein expression of Ang-2 in SMA didn't change obviously in the early stage of shock, yet it was increased at prolonged stage of shock, and topped at 4 h shock group (2.90 folds of normal control, P＜0.01). (2) In the hyperreactivity stage (hypoxia for 30 min), the extrinsic source of Ang-1 further increased the vascular reactivity, while the extrinsic source of Ang-2 decreased the vascular reactivity (P＜0.01). In the hyporeactivity stage (hypoxia for 4h), Ang-1 improved the vascular reactivity (P＜0.01), while Ang-2 further decreased the vascular reactivity (P＜0.01). CONCLUSION: The protein expression of Ang-1 and Ang-2 is different after hemorrhagic shock, and the differential expression of Ang-1 and Ang-2 contributes to the biphasic changes of vascular reactivity after hemorrhagic shock in rats." @default.
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• W957001408 date "2010-09-15" @default.
• W957001408 modified "2023-09-24" @default.
• W957001408 title "Ang-1、Ang-2差异表达在大鼠失血性休克血管反应性双相变化中的作用" @default.
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