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通过AFM-IR纳米光谱学对不同细胞外囊泡隔离方法的比较.

Jéssica Verônica da Silva1, Otávio Berenguel2, Raquel Silva Neres-Santos1

  • 1Centro de Ciências Naturais e Humanas (CCNH), Universidade Federal do ABC, Av. dos Estados 5001, Santo André, SP 09210-580, Brazil.

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概括

细胞外囊泡 (EV) 隔离方法会影响它们的分子特征. 原子力显微镜-红外纳米光谱显示了基于隔离技术的生物分子保存和结构完整性的差异.

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科学领域:

  • 生物物理学的生物物理.
  • 纳米技术 纳米技术
  • 生物化学 生化学

背景情况:

  • 细胞外囊泡 (EVs) 是重要的生物标志物,因为它们的细胞特异性特征.
  • 在纳米尺度上对电子电流进行表征是具有挑战性的,因为它们的小尺寸和传统光谱学的局限性.
  • 原子力显微镜-红外纳米光谱 (AFM-IR) 为纳米尺度EV分析提供了一个潜在的解决方案.

研究的目的:

  • 通过使用不同方法分离的EV的分子特征.
  • 为了将EV地形和生物化学特性与隔离技术相关联.
  • 评估隔离方法对EV完整性和生物分子保存的影响.

主要方法:

  • 从小鼠血清和血中分离出EV,使用总外体隔离反应剂 (TEIR),超离心法 (UC) 和大小排除色谱法 (SEC).
  • 福利埃变换红外光谱 (FTIR) 和AFM-IR用于分析.
  • 使用多变量统计分析 (PCA,PLS-DA) 来解释光谱数据.

主要成果:

  • 隔离方法显著改变了EVs中的酸盐组和糖化链接.
  • 1150厘米以上的生物分子 (例如α螺旋体,脂肪酸) 耗尽了SEC,但保留了蛋白质构造.
  • TEIR影响了核酸,脂和碳水化合物,而UC保留了大多数生物分子,但导致了膜损伤.

结论:

  • 选择EV隔离方法对所得到的分子组成和完整性产生了重大影响.
  • AFM-IR是EVs详细生物物理和生物化学特征的一个有价值的工具.
  • 了解这些依赖于方法的变异对于可靠的EV生物标志物发现和应用至关重要.