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Isolation and Characterization of RNA-Containing Exosomes
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Lyophilization Based Isolation of Exosomes.

Rida E Maria Qazi1, Zahra Sajid1, Chunqiu Zhao2

  • 1Centre for Regenerative Medicine and Stem Cells Research, The Aga Khan University, 1st Flour, Juma Building, Stadium Road, Karachi 74800, Sindh, Pakistan.

International Journal of Molecular Sciences
|July 14, 2023
PubMed
Summary

A novel lyophilization-based method simplifies exosome isolation from cultured cells. This technique offers a cost-effective and accessible alternative for nanomedicine applications, enabling efficient exosome characterization and drug delivery capabilities.

Keywords:
Ph+ leukemiadrug deliveryexosomeslyophilizationnano biopolymers

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Cell Biology

Background:

  • Exosomes, nanoscale extracellular vesicles, are crucial for intercellular communication and hold significant therapeutic potential in nanomedicine.
  • Current exosome isolation techniques often require expensive equipment and reagents, limiting their widespread application.
  • Developing accessible and efficient isolation methods is essential for advancing exosome-based therapies.

Purpose of the Study:

  • To develop and validate a cost-effective lyophilization-based method for isolating exosomes from cultured cells.
  • To characterize the isolated exosomes for their physical properties, surface markers, and drug delivery capabilities.
  • To evaluate the therapeutic potential of drug-loaded exosomes against leukemia cells.

Main Methods:

  • Exosome isolation using a novel lyophilization technique from cultured cells.
  • Characterization via Bradford assay (protein content), SEM and NTA (size, shape), and Western blot (surface markers CD63, CD9, CD81, HSP70, TSG101).
  • In vitro drug loading and release studies using dyes (Cy5, Eosin) and tyrosine kinase inhibitors (dasatinib, ponatinib) on leukemia cell lines (K562, Ba/F3-BCR-ABL).

Main Results:

  • The lyophilization method successfully isolated exosomes (<150 nm, typical shape) expressing key exosomal markers.
  • Demonstrated efficient drug loading and release properties, with loaded exosomes showing anticancer effects (MTT, Annexin-PI assays) on leukemia cells.
  • Isolated exosomes from MCF-7 cells retained MUC1 expression, indicating intact diagnostic potential.

Conclusions:

  • A lyophilization-based method provides an effective and accessible alternative for exosome isolation from cultured cells.
  • The isolated exosomes exhibit suitable characteristics for nanomedicine applications, including drug delivery and therapeutic potential.
  • This method facilitates further research and clinical translation of exosome-based therapies, particularly for leukemia treatment.