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Updated: Jan 11, 2026
A Robust Discovery Platform for the Identification of Novel Mediators of Melanoma Metastasis
Published on: March 8, 2022
Multimodal Nanobiophysical Profiling of Melanoma-Derived Small Extracellular Vesicles Reveals Glycan Signatures
Swamy Kasarla1, Karolina Staniak1,2, Magdalena Surman3
1Laboratory of Biomolecular Interactions Studies, Chair of Drug and Cosmetics Biotechnology, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland.
Purpose:
Small extracellular vesicles (sEVs) are nanoscale biomaterial-like structures involved in intercellular communication and cancer progression. Aberrant surface glycosylation may serve as a diagnostic marker for malignancy. This study aimed to compare the size, glycosylation, and biophysical properties of sEVs secreted by primary and metastatic melanoma cells, and to evaluate a novel analytical technique for glycoprofiling.
Methods:
sEVs were isolated from the primary (WM115) and metastatic (WM266-4) melanoma cell lines. Their size and concentration were assessed via Nanoparticle Tracking Analysis (NTA), and exosomal identity was confirmed using Western blotting. Glycosylation profiling was performed using a multimodal strategy: Quartz Crystal Microbalance with Dissipation monitoring (QCM-D), Nanoplasmonic Sensing (NPS), and, for the first time, Flow-Induced Dispersion Analysis (FIDA). Concanavalin A (Con A) was used as the probe for high-mannose glycans.
Results:
WM266-4-derived sEVs were significantly larger, whereas WM115 cells secreted more vesicles. Western blotting confirmed the presence of exosomal markers and absence of organelle contaminants. QCM-D and NPS showed stronger Con A binding and higher glycan viscoelasticity index (gVI) in metastatic sEVs, indicating altered glycan architecture. FIDA further confirmed these differences by quantifying a lower dissociation constant (Kd) and multivalent binding behavior in WM266-4-derived sEVs, consistent with a denser glycan coat.
Conclusion:
Metastatic melanoma-derived sEVs exhibited distinct Con A-detectable high-mannose glycosylation patterns that may represent malignancy-associated features. This study demonstrates the utility of multimodal nanobiophysical methods, particularly FIDA, as sensitive tools for EV glycoprofiling. While the present findings are based on cell line-derived sEVs, they support the translational potential of glycan-based signatures for future liquid biopsy platforms and expand the analytical capabilities of cancer nanodiagnostics.
