在唐氏综合征患者的心脏发育过程中异常的组织力学和机械传导
Rachel S Reeser1, Mitchell C VeDepo2, Rukshika S Hewawasam2
1Department of Bioengineering, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Linda Crnic Institute for Down Syndrome, Colorado, Aurora, CO 80045, USA.
Journal of biomechanics
|December 30, 2025
概括
唐氏综合征 (DS) 的先天性心脏缺陷可能源于改变的组织机制. 较严的环境和机械压力会在三发性病21模型中扰乱心脏细胞的发育,这表明有生物机械途径.
科学领域:
- 心血管生物学 心血管生物学
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
背景情况:
- 唐氏综合征 (DS) 与隔膜心脏缺陷的高发病率有关.
- 在DS中异常的心脏发育表明潜在的分子和细胞机制.
- 细胞外基质 (ECM) 组成和组织硬性对心脏发育至关重要.
研究的目的:
- 调查心肌细胞结构变化和组织硬性在唐氏综合征中心肌细胞机制传导中的作用.
- 通过Dp16小鼠模型和iPSC衍生的心肌细胞,检查21型三症对心脏发育的影响.
- 确定可能导致唐氏综合征先天性心脏缺陷的生物力学途径.
主要方法:
- 使用Dp16小鼠模型和21型三发性诱导的多能干细胞衍生心肌细胞 (iPSC-CM).
- 与野生型 (WT) 相比,在Dp16小鼠中评估了内心的组织度.
- 在不同硬度的基板上培养iPSC-CM,并将它们 subjected to cyclic mechanical stretch.
主要成果:
- Dp16小鼠模型中的内心显示了增加硬度的趋势.
- 三重症21 iPSC-CM在更硬的基板上表现出减少的增殖.
- DS iPSC-CM显示了对机械拉伸的异常反应,包括无组织的瘤和心脏标志物表达的减少.
结论:
- 增加的ECM沉积和由此产生的组织性可能导致唐氏综合征中的心脏缺陷.
- 三位体21型心肌细胞对机械线索作出异常反应,影响心脏发育.
- 生物力学因素代表了一条新的途径,用于理解和潜在地治疗唐氏综合征中的先天性心脏缺陷.
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