增量拉伸增加了强度和性,同时增长了工程三叶纸心脏门.
Benjamin J Albert1, John T Toftegaard1, Gaetano Scuderi1
1Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York 14850, United States of America.
ACS biomaterials science & engineering
|September 20, 2025
概括
组织工程心脏门 (TEHVs) 可以快速生长和加强使用渐进式增长拉伸 (iStretch) 方法. 这种技术促进细胞对齐,分化,并增强功能开发的机械性质.
科学领域:
- 生物材料科学 生物材料科学
- 再生医学是一种再生医学.
- 组织工程是组织工程.
背景情况:
- 目前的组织工程心脏门 (TEHV) 面临着长时间培养和移植扩张的挑战.
- 现有的方法往往难以将组织强化与尺寸增加相关联,从而限制了TEHV的有效性.
研究的目的:
- 为了研究逐渐增加拉伸 (iStretch) 对基于纤维素的干细胞种植的工程心脏膜组织的影响.
- 确定拉伸时间和大小如何影响组织生长,机械性质和细胞分化.
主要方法:
- 开发一种可适应的,基于机械固的培养系统,用于应用iStretch.
- 在不同的拉伸方案下评估线性,平面和小册子形组织.
- 评估机械性质 (模块,故障应力,性) 和细胞反应 (对齐,分化,维丁表达).
- 在脉冲复制器系统中工程三叶式门的功能测试.
主要成果:
- iStretch显著增加了组织模量,故障应力和性,实现了100%的组织长度增加.
- 早期的iStretch增量促进了细胞对齐和分化到一个介质细胞表型.
- 拉伸的平面叶片组织显示细胞密度增加和维丁表达.
- 工程三叶式门在高压 (高达80mmHg) 时显示出完全打开和有效的合.
结论:
- iStretch是一种有效的方法,可以同时实现工程心脏膜组织的快速生长和机械强化.
- iStretch系统提供了对组织发育的可调节控制,解决了当前TEHV方法的局限性.
- 这些发现凸显了iStretch在制造适合临床应用的功能性TEHV方面的潜力.
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