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Updated: Aug 26, 2025
Using Nanoplasmon-Enhanced Scattering and Low-Magnification Microscope Imaging to Quantify Tumor-Derived Exosomes
Published on: May 24, 2019
Exosomal proteins as a source of biomarkers in colon cancer-derived peritoneal carcinomatosis - A pilot study
Paul A Vallejos1, Ryan N Fuller1, Janviere Kabagwira1
1Department of Basic Sciences, Center for Health Disparities & Molecular Medicine, Division of Biochemistry, Loma Linda University Medical Center, Loma Linda, California, USA.
Purpose:
Peritoneal carcinomatosis (PC), metastasized from colorectal cancer (CRC), remains a highly lethal disease. Outcomes of PC is significantly influenced by the amount of intra-abdominal tumor burden and therefore diagnostic tests that facilitate earlier diagnosis could improve PC treatment and patient outcomes.
Experimental Design:
Using mass-spectrometry-based proteomics, we characterized the protein features of circulating exosomes in the context of CRC PC, CRC with liver metastasis, and primary CRC limited to the colon. We profiled exosomes isolated from patient plasma to identify exosome-associated protein cargoes released by these cancer types.
Results:
Analysis of the resulting data identified metastasis-specific exosome protein signatures. Bioinformatic analyses confirmed enrichment of proteins annotated to vesicle-associated processes and intracellular compartments, as well as representation of cancer hallmark functions and processes.
Conclusion And Clinical Relevance:
This research yielded distinct protein profiles for the CRC patient groups and suggests the utility of plasma exosome proteomic analysis for a better understanding of PC development and metastasis.
