瘤坏死因子-α调节胰岛素样生长因子-1和胰岛素样生长因子结合蛋白-3在血管光滑肌肉中的表达
A Anwar1, A A Zahid, K J Scheidegger
1Division of Cardiology, University Hospital of Geneva, Switzerland.
Circulation
|March 13, 2002
概括
瘤亡因子-α (TNF-α) 降低胰岛素样生长因子-1 (IGF-1) 并增加血管光滑肌细胞中的IGF结合蛋白-3 (IGFBP-3). 这种TNF-α对IGF-1的下调可能会促进冠状动脉综合征中的斑块不稳定性.
科学领域:
- 心血管生物学心血管生物学
- 分子医学是分子医学.
- 动脉样硬化的研究研究.
背景情况:
- 像TNF-alpha这样的炎症调解剂可以通过改变VSMC存活率和细胞外基质来影响冠状动脉斑块完整性.
- 已知胰岛素样生长因子-1 (IGF-1) 能预防亡并促进基质形成,抵消一些炎症效应.
研究的目的:
- 研究关键细胞因子对血管光滑肌细胞 (VSMC) 内IGF-1系统的影响.
- 阐明TNF-alpha在调节VSMC中的IGF-1和IGF结合蛋白 (IGFBPs) 的作用.
主要方法:
- 小鼠大动脉VSMC被用各种度的TNF-alpha,IL-1beta,IL-6和IFN-gamma进行治疗.
- 分析了IGF-1和IGFBP-3的基因表达 (mRNA) 和蛋白质水平.
- 转录机制的评估使用了actinomycin D.
- 使用抗IGFBP-3抗体和亡试验来评估功能性影响.
主要成果:
- 在VSMC中,TNF-alpha显著降低了IGF-1mRNA,增加了IGFBP-3mRNA和蛋白质.
- 其他测试的细胞因子 (IL-1β,IL-6,IFN-) 并没有影响IGF-1系统.
- 增加的IGFBP-3水平与减少的VSMCDNA合成相关,而IGF-1类似物减少了细胞亡.
结论:
- 在VSMC中,TNF-α降低IGF-1的调节,并提高IGFBP-3的调节,可能会降低生物活性IGF-1.
- 这种TNF-α介导的IGF-1降低可能导致VSMC活力下降和冠状动脉综合征中的斑块不稳定性.
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