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扩张性心肌病与 I/III 类型原体比率的显著变化有关
M Pauschinger1, D Knopf, S Petschauer
1Medical Clinic II, University Hospital Benjamin Franklin, Freie Universität Berlin, Germany.
Circulation
|June 3, 1999
概括
扩张性心肌病 (DCM) 显示了I型和III型原蛋白的增加,导致I型/III型原蛋白比率更高. 这种变化的比率可能会导致DCM患者的静缩和静缩功能障碍.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 心肌纤维化是末期扩张性心肌病 (DCM) 的标志.
- 在DCM相关纤维化中,改变的I型/III型原蛋白 (Col I/Col III) 比率的作用仍然存在争议.
研究的目的:
- 在DCM患者中研究心肌原蛋白I/III型的比率.
- 评估原表达和左心室喷射率 (EF) 之间的关系.
主要方法:
- 对于Col I,Col III,TGF-beta1和TGF-beta2的定量竞争逆转录酶-聚合酶连锁反应 (qRT-PCR) 的基因表达.
- 皮克罗西里乌斯红色染色,免疫组织学染色和氧胺测定用于原蛋白量化.
- 来自DCM患者 (EF <50%) 和对照组 (EF >50%) 的内心肌瘤活检的分析.
主要成果:
- 与对照组相比,DCM患者的Col I mRNA增加了2至6倍,蛋白质水平增加了1.6倍.
- 在DCM患者中,Col III mRNA的丰度增加了2.0倍.
- 在DCM患者 (8.2) 和对照组 (6.4) 中,Col I/Col III mRNA比率显著更高.
- 在DCM患者中,总原蛋白含量和氧/总蛋白质比率升高.
- 在DCM患者中观察到TGF-beta1和TGF-beta2的心肌mRNA水平升高.
结论:
- 在Col I和Col III表达的差异性增加导致DCM心肌中Col I/Col III比率升高.
- 增加的Col I/Col III比率,由于增强了Col I的刚性,可能会导致DCM中的静缩和静缩功能障碍.
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