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Related Concept Videos

Overview of Exosomes01:36

Overview of Exosomes

Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...

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Related Experiment Video

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Using Nanoplasmon-Enhanced Scattering and Low-Magnification Microscope Imaging to Quantify Tumor-Derived Exosomes
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Exosomes: proteomic insights and diagnostic potential.

Richard J Simpson1, Justin We Lim, Robert L Moritz

  • 1Ludwig Institute for Cancer Research, PO Box 2008, Royal Melbourne Hospital, Parkville, Victoria 3050, Australia. richard.simpson@ludwig.edu.au

Expert Review of Proteomics
|June 4, 2009
PubMed
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Exosomes, tiny vesicles involved in cell communication, are found in body fluids and show potential as disease biomarkers. Advanced proteomic analysis reveals their molecular composition and diagnostic capabilities.

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Area of Science:

  • Extracellular vesicles research
  • Cell biology
  • Biochemistry

Background:

  • Exosomes are nanoscale membrane vesicles secreted by cells for intercellular communication.
  • They are found in various body fluids and play roles in biological functions, including immune response and molecular transfer.
  • Exosomes have been implicated in disease pathogenesis and hold potential as diagnostic biomarkers.

Purpose of the Study:

  • To provide an overview of exosomes, their isolation, and characterization.
  • To discuss advances in proteomic methods for exosome analysis.
  • To highlight the diagnostic potential of exosomal microRNA profiles.

Main Methods:

  • Exosome isolation and purification techniques.
  • Mass spectrometry-based proteomic analysis (hardware and software).
  • MicroRNA profiling of circulating exosomes.

Main Results:

  • Proteomic cataloguing reveals common exosomal proteins and cell-specific markers.
  • Exosomes contain functional mRNA and microRNA transferable between cells.
  • Increased exosome levels and specific biomarkers are observed in tumor cells.

Conclusions:

  • Exosomes are crucial for intercellular communication and have diverse biological functions.
  • Advanced proteomic techniques enhance understanding of exosome composition.
  • Exosomal microRNA profiles offer noninvasive diagnostic biomarkers for diseases, particularly cancer.