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Functional surfaces for exosomes capturing and exosomal microRNAs analysis.

Cristina Potrich1, Anna Pedrotti2, Cecilia Pederzolli2

  • 1FBK-Fondazione Bruno Kessler, Center for Sensors and Devices, via Sommarive, 18, I-38123, Trento, Italy; Consiglio Nazionale delle Ricerche, Istituto di Biofisica, via alla Cascata 56/C, I-38123, Trento, Italy.

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|November 10, 2023
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Summary
This summary is machine-generated.

Researchers developed new functionalized surfaces for efficient exosome isolation. A negatively-charged surface captured over 4x10^8 exosomes/cm², enabling microRNA biomarker analysis for biosensors.

Keywords:
Exo-miR-21Exosomes captureMicroRNAReal-time PCRSurface functionalization

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Molecular Biology

Background:

  • Exosomes are crucial for cell signaling and contain valuable biomarkers like microRNAs.
  • Current exosome isolation methods suffer from low efficiency and purity.
  • Microfluidics and functionalized surfaces offer potential solutions for improved isolation.

Purpose of the Study:

  • To develop and characterize functionalized surfaces for efficient exosome capture.
  • To evaluate the performance of different surface chemistries for exosome isolation.
  • To enable on-chip exosome isolation for biomarker analysis.

Main Methods:

  • Functionalization of silicon oxide substrates with charged (positive, negative, neutral) and immunoaffinity surfaces.
  • Testing surfaces with exosome-mimicking vesicles and purified exosomes.
  • Quantification of captured exosomes and analysis of exosomal microRNAs using RT-PCR.

Main Results:

  • Negatively-charged surfaces demonstrated high exosome capture capacity (> 4 × 10^8 exosomes/cm²).
  • Captured exosomes retained their integrity for biomarker analysis.
  • Successful RT-PCR analysis of exosomal microRNAs from captured exosomes.

Conclusions:

  • Functionalized surfaces, particularly negatively-charged ones, significantly improve exosome isolation efficiency and purity.
  • Developed surfaces are suitable for integration into microfluidic devices for on-chip exosome isolation.
  • This approach facilitates the development of rapid biosensors for clinical and research biomarker analysis.