在发育和衰老期间,小鼠皮肤的生物机械和生物化学变化
Anastasiya Martyts1, David Sachs1, Paul Hiebert2
1Institute for Mechanical Systems, Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland.
Acta biomaterialia
|July 15, 2024
概括
皮肤 皮肤 皮肤 皮肤
科学领域:
- 生物物理学的生物物理.
- 生物材料科学 生物材料科学
- 皮肤病学 皮肤病学
背景情况:
- 皮肤衰老涉及生物化学和生物机械变化,具有功能后果.
- 有限的研究量化了微观结构变化及其与随着时间的推移与宏观生物力学行为的联系.
- 了解组织成熟需要将微观变化与宏观性质联系起来.
研究的目的:
- 研究不同年龄组的皮肤成熟及其生物力学演变.
- 在小鼠模型中,将微观的皮肤变化与宏观的生物机械行为相关联.
- 为了弥合微观结构变化和宏观组织功能之间的知识差距,随着时间的推移.
主要方法:
- 从新生儿,成年和老年小鼠的小鼠皮肤的多尺度表征.
- 机械测试:单轴负载,张力松,负载到故障,膨胀实验.
- 显微镜分析:组织学,生物化学,原子力显微镜 (AFM) 缩影.
主要成果:
- 与成人皮肤相比,新生儿皮肤表现出明显不同的生物力学特性,减少了原蛋白,并改变了交叉链接.
- 成人和老年皮肤在生理负荷范围内表现出类似的生物力学行为.
- 老化的皮肤在高力值下表现出较低的拉伸强度和硬化,与原蛋白变化相关.
- 计算机建模揭示了年龄诱导的生物力学变化影响皮肤细胞生物物理环境.
结论:
- 皮肤的微观结构和生物力学特性在成熟和老化过程中发生显著变化.
- 老化的皮肤保持在生理范围内的功能,但在高压力下减弱,这与原蛋白的变化有关.
- 与年龄相关的微观结构差异对组织层面的特性和细胞生物物理环境都有深远的影响.
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