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Published on: October 17, 2022
Proteomic Validation of MEG-01-Derived Extracellular Vesicles as Representative Models for Megakaryocyte- and
Jose Manuel Sanchez-Manas1,2, Sonia Perales1,2,3, Gonzalo Martinez-Navajas1,2
1Gene Regulation, Stem Cells and Development Group, PTS, Granada GENyO, Pfizer-University of Granada-Andalusian Regional Government Centre for Genomics and Oncological Research, Avenida de la Ilustración 114, 18016 Granada, Spain.
Abstract:
Platelets and their extracellular vesicles (EVs) have emerged as promising liquid biopsy biosources for cancer detection and monitoring. The megakaryoblastic MEG-01 cell line offers a controlled system for generating platelet-like particles (PLPs) and EVs through valproic-acid-induced differentiation. Here, we performed comprehensive characterization and proteomic validation of MEG-01-derived populations, native human platelets, and their EVs using nanoparticle tracking analysis, transmission electron microscopy, imaging flow cytometry and quantitative proteomics. MEG-01 megakaryocytic differentiation is characterized by polylobulated nuclei, proplatelet formation, and elevated CD41/CD42a expression. PLPs predominantly exhibit an activated-like phenotype (CD62P+, degranulated morphology), while microvesicles (100-500 nm) and exosomes (50-250 nm) displayed size distributions and phenotypic markers consistent with native platelet-derived EVs. Proteomics identified substantial core proteomes shared across fractions and fraction-specific patterns consistent with selective cargo partitioning during EV biogenesis. Functional enrichment indicated that MEG-01-derived vesicles preserve key hemostatic, cytoskeletal, and immune pathways commonly associated with platelet EV biology. Ingenuity Pathway Analysis showed that PLPs exhibit proliferative transcriptional programs (elevated MYC/RB1/TEAD1, reduced GATA1), while plasma exosomes display minimal differential pathway activation compared to MEG-01 exosomes. Overall, these findings suggest that MEG-01-derived EVs approximate certain aspects of megakaryocyte-lineage exosomes and activated platelet-like states, although they do not fully replicate native platelet biology. Notably, plasma exosomes show strong proteomic convergence with MEG-01 exosomes, whereas platelet exosomes retain distinct activation-related features.
Insights
The MEG-01 cell line generates platelet-like particles and extracellular vesicles (EVs) that mimic some aspects of native platelet EVs, offering a controlled model for cancer liquid biopsy research. Proteomic analysis reveals shared and distinct features, aiding understanding of EV biogenesis and function.
Area of Science:
- * Hematology and Oncology
- * Cell Biology
- * Proteomics and Metabolomics
Background:
- * Platelets and their extracellular vesicles (EVs) are emerging as valuable liquid biopsy tools for cancer detection and monitoring.
- * The MEG-01 megakaryoblastic cell line provides a controlled in vitro system for studying platelet-like particles (PLPs) and EVs.
- * Valproic acid-induced differentiation of MEG-01 cells is used to generate these platelet-derived vesicles.
Purpose of the Study:
- * To comprehensively characterize and proteomically validate MEG-01-derived PLPs and EVs.
- * To compare these derived vesicles with native human platelets and their EVs.
- * To assess the utility of MEG-01-derived EVs as a model for platelet EV biology in cancer research.
Main Methods:
- * Nanoparticle tracking analysis (NTA) for size and concentration.
- * Transmission electron microscopy (TEM) for morphology.
- * Imaging flow cytometry for phenotypic marker analysis (e.g., CD41, CD42a, CD62P).
- * Quantitative proteomics to identify protein cargo.
- * Ingenuity Pathway Analysis (IPA) for functional enrichment.
Main Results:
- * MEG-01 differentiation yielded polylobulated nuclei, proplatelet formation, and elevated CD41/CD42a.
- * MEG-01-derived PLPs showed an activated-like phenotype (CD62P+, degranulated), while microvesicles and exosomes matched native EV size and markers.
- * Proteomics revealed shared core proteomes and fraction-specific cargo partitioning, with preserved hemostatic, cytoskeletal, and immune pathways.
- * PLPs exhibited proliferative transcriptional programs, distinct from plasma and MEG-01 exosomes.
Conclusions:
- * MEG-01-derived EVs partially replicate megakaryocyte-lineage exosomes and activated platelet-like states.
- * While not fully replicating native platelet biology, MEG-01 EVs offer a valuable controlled model.
- * Plasma exosomes showed proteomic convergence with MEG-01 exosomes, but platelet exosomes retained distinct activation features.
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