在实验室中,矩阵金属蛋白酶对ECM水凝生物降解的剂量依赖性影响
Nadine Didwischus1, Arun Guduru2, Stephen F Badylak3
1Department of Radiology, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
Acta biomaterialia
|December 11, 2023
概括
细胞外基质 (ECM) 水凝在中风后通过水解和基质金属蛋白酶 (MMP) 降解. MMP-9导致了最显著的生物降解,影响了中风再生的治疗窗口.
科学领域:
- 生物材料科学是生物材料的科学.
- 再生医学是一种再生医学.
- 中风研究研究中风研究
背景情况:
- 矩阵金属蛋白酶 (MMPs) 在中风影响的组织中降解细胞外矩阵 (ECM).
- 用于中风组织再生的ECM水凝的降解机制尚未完全理解.
研究的目的:
- 为了研究矩阵金属蛋白酶 (MMPs) 在降解尿膀矩阵 (UBM) 水凝中的结构功能关系.
- 为了确定水解和蛋白质溶解对ECM水凝生物降解的影响,在中风腔模型中.
主要方法:
- 在体外降解试验测定了量化UBM水凝随时间的质量损失.
- 风湿学表征评估了不同度的水凝特性.
- 用各种溶液和MMP混合物量化水解和MMP诱导的降解.
主要成果:
- 较低的ECM度 (<4 mg/mL) 导致更弱的水凝容易被冲洗.
- 水解导致水凝质量每天减少2%;用PBS和人工脑脊液加速到6%.
- 在14天内,MMPs诱导了剂量依赖的,几乎完全 (>95%) 的水凝降解,MMP-9是最有效的.
- 混合MMPs显示时间依赖的降解,早期的中风后混合物降解速度更快.
结论:
- 除了MMP驱动的蛋白质分解之外,水解显著影响ECM的水凝降解.
- 了解ECM水凝生物降解机制对于优化生物支架植入时间和降解动力学对于中风组织再生至关重要.
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