增加的变形是不可或缺的封装细胞机制响应工程骨类类似物中模仿老化骨髓的骨髓
Alexander M Regner1, Maximilien DeLeon2,3, Kalin D Gibbons1
1Mechanical and Biomedical Engineering Department, Boise State University, USA.
Mechanobiology in medicine
|March 26, 2025
概括
低强度振动 (LIV) 可以通过刺激介质干细胞 (MSCs) 来改善老化和太空飞行中的骨健康. 一个新的3D骨髓模型显示,LIV增强了MSC,但支架密度也影响了细胞反应.
科学领域:
- 生物医学工程 生物医学工程
- 机械生物学 机械生物学
- 组织工程是组织工程.
背景情况:
- 老龄化和太空飞行导致骨质损失,部分原因是骨髓的机械信号减少.
- 介质干细胞 (MSCs) 调节骨健康,并对机械刺激做出反应.
- 低强度振动 (LIV) 已经显示出通过改善MSC功能来抵消与年龄相关的骨质损失的潜力.
研究的目的:
- 研究机械信号传递在与年龄相关的骨质损失中的作用.
- 开发和验证用于研究骨机械生物学的3D骨髓模拟.
- 评估LIV对不同骨髓微环境中的MSC的影响.
主要方法:
- 开发一个3D骨髓模拟器,具有可控制的脊椎体几何和力学.
- 使用聚乳酸 (PLA) 制造的脚手架,使用不同的脚手架体积分数 (SV/TV) 模拟成年 (25%) 和老年 (13%) 骨头.
- 封装MSCs在水凝在脚手架和应用LIV (1克,100赫兹,1小时/天) 在14天内.
- 细胞增殖的量化,I型原蛋白 (原-I) 和丝状动蛋白 (F-actin) 的处理后.
- 使用有限元 (FE) 模型进行验证,以量化水凝内的机械应变.
主要成果:
- LIV治疗增加了水凝内的MSC中的细胞增殖,原-I和F-actin.
- FE模型预测密度较低 (13% SV/TV) 支架中的von Mises菌株比密度较高 (25% SV/TV) 支架更高.
- 虽然LIV在较低密度的支架中增强了原-I的产生,但整体的原-I和F-actin水平仍然低于更高密度的支架,这表明机械应变和可用的表面积的结合作用.
结论:
- 3D骨髓类似物为研究骨机械生物学提供了一个强大的平台.
- 来自LIV的机械应变和骨髓的物理结构 (脚手架密度) 都会影响MSC的行为.
- 这种模型系统可以帮助阐明骨质损失的机制,并为治疗干预的策略提供信息.
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