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幸存者通过控制心肌细胞总数来确定心脏功能
Bodo Levkau1, Michael Schäfers, Jeremias Wohlschlaeger
1Institut für Pathophysiologie, Universitätsklinikum Essen, Essen Germany. levkau@uni-essen.de
Circulation
|March 12, 2008
概括
存活对于通过调节心肌细胞的分裂和数量来维持心脏功能至关重要. 它的缺失导致心力衰竭和过早死亡,突出其作为心脏再生疗法的目标潜力.
科学领域:
- 心血管生物学 心血管生物学
- 细胞循环规则 细胞循环规则
- 分子心脏病学分子心脏病学
背景情况:
- 在许多器官中,Survivin在抑制细胞亡和细胞分裂中的作用是已知的,但其心脏功能仍然不清楚.
- 了解幸存者的心脏功能对于治疗心脏病至关重要.
研究的目的:
- 调查幸存者在心脏功能和心肌细胞平衡中的作用.
- 探索幸存者作为心肌再生的潜在治疗点.
主要方法:
- 在alpha-myosin重链 (MHC) -survivin的心脏特异性删除.小鼠.
- 用于心肌细胞量化的立体方法.
- 心声图,MRI,PET和侵入性导管治疗用于评估心脏功能.
- 在新生小鼠心肌细胞中存活的小干扰RNA (siRNA) 敲除.
- 在心肌细胞中生存的腺病毒过度表达.
主要成果:
- 心脏特异性幸存者删除导致过早死亡,原因是心肌细胞数量减少,这是由于线粒细胞发生率下降和不发生亡而增加的多性.
- 幸存者的缺乏导致渐进性心力衰竭,其特点是心肌细胞每次血液动力负荷增加.
- 幸存者过度表达抑制了亡,诱导了DNA合成,并促进了心肌细胞的细胞周期进展.
- 在人类心肌病症中,幸存者表达与心肌细胞DNA含量相关,并且在失败的心脏中被上调.
结论:
- 在心脏病易感性方面,体遗传决定的心肌细胞数量是关键因素.
- 幸存者在调节心肌细胞复制和存活方面发挥着关键作用,使其成为心肌再生的有希望的目标.
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