What are Extracellular Vesicles (EVs)?

About Extracellular Vesicles (EVs):

• EVs are small membranous nanoparticles secreted by all types of cells into the extracellular space.
• They can be found in numerous bodily fluids, including blood, urine, cerebrospinal fluid, and more.
• The biochemical composition of EVs mainly consists of lipids, proteins, and nucleic acids.
• Derived from cells, EVs obtain their appearance based on the cargo transferred from the donor cells, known as their molecular signature.
• Unlike other cellular components, EVs are not capable of replication.
• EVs are broadly classified into:
  • Exosomes (30–150 nm): Originate from endosomal compartments.
  • Microvesicles (100–1000 nm): Shed directly from the plasma membrane.
  • Apoptotic bodies (>1000 nm): Released by dying cells.
• EVs have a wide range of uses in various fields, and their therapeutic potential is currently being explored in many preclinical and clinical studies.
  • Intercellular communication:
    • EVs play an important role in intercellular communication by transferring biological molecules, such as proteins, lipids, and nucleic acids, between cells.
    • This process can influence various physiological and pathological processes, including immune response, tissue regeneration, and cancer progression.
  • Diagnostic markers:
    • EVs can serve as diagnostic markers for various diseases, as they contain biomolecules that reflect the physiological state of the parent cell.
    • For example, circulating EVs have been shown to contain biomarkers for cancer and neurodegenerative diseases, and their analysis can aid in disease diagnosis and prognosis.
  • Drug delivery:
    • EVs can be engineered to deliver therapeutic molecules, such as drugs or nucleic acids, to target cells.
    • These offer several advantages over traditional drug delivery systems, including high biocompatibility, low immunogenicity, and the ability to cross biological barriers.
  • Tissue engineering:
    • EVs can promote tissue regeneration and repair by modulating cellular behavior and signaling pathways.
    • These have been used in various tissue engineering applications, including bone regeneration, cartilage repair, and wound healing.