缺氧—复氧诱导ECV304细胞与中性粒细胞粘附的分子机制
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国家自然科学基金(30171084);;湖南省社会发展重大项目(01ssy200904)资助


Molecular Mechanisms of Neutrophils Adhesion to ECV304 Induced by Hypoxia-Reoxygenation
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    摘要:

    为探讨缺氧—复氧诱导人脐静脉内皮细胞ECV30 4与中性粒细胞粘附的信号转导机制,以缺氧—复氧诱导粘附为模型,采用比色法检测粘附率,流式细胞术检测ECV30 4细胞表面粘附分子E选择素、细胞间粘附分子1的表达,Westernblot法检测ECV30 4细胞亲环素A、磷酸化细胞外信号调节激酶、总细胞外信号调节激酶、磷酸化p70核糖体S6激酶、总p70核糖体S6激酶蛋白的表达。结果发现,经缺氧—复氧处理后,ECV30 4细胞E选择素、细胞间粘附分子1的表达上调,其表面中性粒细胞粘附增加。总细胞外信号调节激酶、总p70核糖体S6激酶蛋白表达无明显改变,亲环素A蛋白表达明显上调,细胞外信号调节激酶和p70核糖体S6激酶显著活化。亲环素A抑制剂环孢霉素A以及亲环素A反义寡核苷酸均明显减轻缺氧—复氧诱导的细胞外信号调节激酶和p70核糖体S6激酶激活,显著减少ECV30 4细胞与中性粒细胞粘附。p70核糖体S6激酶阻断剂雷帕霉素显著抑制p70核糖体S6激酶的激活,中性粒细胞与ECV30 4细胞的粘附亦明显减少。细胞外信号调节激酶信号通路特异性阻断剂PD980 5 9亦显著抑制ECV30 4细胞与中性粒细胞粘附。结果提示,亲环素A 细胞外信号调节激酶 p70核糖体S6激酶信号通路介导缺氧—复氧诱导的ECV30 4细胞与中性粒细胞粘附。

    Abstract:

    Aim To investigate the signal transduction of neutrophils adhesion to human umbilical vein endothelial cells (hUVEC, ECV304) induced by hypoxia/reoxygenation. Methods The adhesion model was reproduced by hypoxia/ reoxygenation. The adhesion rate of neutrophils to ECV304 was determined by color matching. The expression of endothelial cell adhesion molecules of E-selectin and intercellular adhesion molecule-1 (ICAM-1) was measured with flow cytometry. The expression of cyclophilin A and the activation of extracellular signal-regulated kinase (ERK1/2) and p70 ribosomal S6 kinase (p70 S6K) were compared among experimental groups by western blot. Results After stimulation with 1 h hypoxia/4 h reoxygenation, ECV304 showed an enhanced neutrophil adhensivity in the association with an increased surface expression of E-selectin and ICAM-1. Furthermore, the expression of cyclophilin A increased significantly following 1 h hypoxia/4 h reoxygenation, which was accompanied with an increased activation of ERK1/2 and p70 S6K. Treatment with cyclophilin A inhibitor cyclosporin A and cyclophilin A antisense oligodeoxynucleotides significantly inhibited the activation of ERK1/2 and p70 S6K and decreased the adhesion of neutrophils to ECV304. p70 S6K antagonist rapamycin also significantly decreased the adhesion of neutrophils to ECV304. The specific ERK1/2 inhibitor PD98059 showed inhibition to neutrophils adhesion to hypoxia/reoxygenation-stimulated ECV304. Conclusions Cyclophilin A-ERK1/2-p70 S6K pathway is involved in the adhesion of neutrophils to ECV304 induced by hypoxia/reoxygenation.

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周四桂,雷小勇,严鹏科,严奉祥,朱炳阳,廖端芳.缺氧—复氧诱导ECV304细胞与中性粒细胞粘附的分子机制[J].中国动脉硬化杂志,2004,12(4):378~382.

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  • 收稿日期:2004-02-26
  • 最后修改日期:2004-05-01
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