Effect and mechanism of high glucose on expression of hypoxia-inducible factor 1α in cultured neonatal rat cardiomyocytes under hypoxia and non-hypoxia conditions
- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF DIABETES
- Issue:
- 1
- DOI:
- 10.3969/j.issn.1006-6187.2010.01.017
- Key Word:
- 高血糖;氯化钴;缺氧诱导因子1α;乳鼠心肌细胞;抗氧化剂α-tocopherol
Abstract： 目的 探讨血糖对缺氧状态及非缺氧状态下大鼠心肌细胞缺氧诱导因子1α(HIF-1α)的作用及机制. 方法 体外培养新生大鼠的心肌细胞,给予不同的处理因素培养6h,具体分组为:(1)正常对照组(5.5mmol/L葡萄糖);(2)氯化钴(Cocl_2)模拟缺氧组(5.5mmol/L葡萄糖+400μmol/L Cocl_2);(3)高葡萄糖组(11.1、22.2、33.3 mmol/L葡萄糖);(4)Cocl_2(模拟缺氧)+高葡萄糖组(11.1mmol/L葡萄糖+400μmol/L Cocl_2,22.2mmol/L葡萄糖+400mmol/L Cocl_2>,33.3mmol/L葡萄糖+400μmol/Lcocl_2);(5)高葡萄糖+抗氧化剂α-tocopherol组(33.3mmol/L葡萄糖+100μmol/L α-tocopherol);(6) Cocl_2(模拟缺氧)+高葡萄糖+α-tocopherol组(33.3mmol/L葡萄糖+400μmol/L Cocl_2+100μmol/L α-tocopherol).观察高葡萄糖、Cocl_2、高葡萄糖合并氯化钴对HIF-1α mRNA及蛋白表达的影响,以及给予α-tocopherol阻断氧化作用后,高葡萄糖、高葡萄糖合并Cocl_2对HIF-1α mRNA及蛋白表达影响的变化.结果 (1)与正常对照组相比,Cocl_2模拟缺氧后,大鼠心肌细胞HIF-1α的表达增加;(2)在非缺氧状态下,随着葡萄糖浓度(5.5、11.1、22.2、33.3mmol/L)的增加HIF-1α的表达逐渐增加;(3)Cocl_2合并高葡萄糖培养条件下,随着葡萄糖浓度(5.5、11.1、22.2、33.3mmol/L)的增加,大鼠心肌细胞HIF-1α的表达逐渐减弱;(4)高葡萄糖合并α-tocopherol(33.3mmol/L Glu+100 μmol/L α-tocopherol)培养条件下,大鼠心肌细胞HIF-1α的表达较单纯高葡萄糖(33.3mmol/L)时减弱;(5)Cocl_2合并高葡萄糖及α-tocopherol(33.3mmol/L Glu+400 μmol/L Cocl_2+100μmol/L α-tocopherol)的培养条件下,HIF-1α的表达较同样氯化钴合并高葡萄糖(33.3mmol/L Glu+400μmol/L Cocl_2)时增加. 结论 葡萄糖对非缺氧状态下培养的大鼠心肌细胞HIF-1α的作用是增强其表达,而对缺氧状态下培养的大鼠心肌细胞HIF-1α的作用是减弱其表达,其机制可能涉及活性氧(ROS)信号转导系统及氧化应激反应.
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