One-Pot Exosome Proteomics Enabled by a Photocleavable Surfactant

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Exosomes are crucial extracellular vesicles (EVs) with significant diagnostic and therapeutic potential.
• Current mass spectrometry-based exosome proteomics methods are hindered by laborious sample preparation, limiting throughput.
• Efficient exosome protein profiling is essential for advancing liquid biopsy applications.

Purpose of the Study:

• To develop a streamlined, high-throughput method for exosome proteomics.
• To simplify the lysis and protein extraction process for exosomes.
• To enable deeper and more reproducible exosomal proteome coverage.

Main Methods:

• Development of a one-pot exosome proteomics method utilizing a photocleavable surfactant (Azo).
• Application of the method to exosomes from mammary fibroblasts.
• Analysis using reversed-phase liquid chromatography coupled to trapped ion mobility spectrometry (TIMS) quadrupole time-of-flight mass spectrometry.

Main Results:

• Successfully identified 3466 proteins and quantified 2288 proteins in exosomes.
• 91% of identified proteins were annotated in established exosome/EV databases (ExoCarta, Vesiclepedia).
• Demonstrated high reproducibility and deep proteome coverage with the new method.

Conclusions:

• The one-pot method significantly simplifies and accelerates exosome proteomics.
• This approach enhances exosomal protein extraction efficiency and reproducibility.
• The method holds broad applicability for exosome research in diagnostics and therapeutics.