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Updated: Sep 30, 2025
A Preclinical Mouse Model of Osteosarcoma to Define the Extracellular Vesicle-mediated Communication Between Tumor and Mesenchymal Stem Cells
Published on: May 6, 2018
FT-IR Spectral Signature of Sensitive and Multidrug-Resistant Osteosarcoma Cell-Derived Extracellular Nanovesicles
Francesca Perut1, Gabriela Graziani2, Laura Roncuzzi1
1Biomedical Science and Technologies Lab, IRCCS Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy.
Abstract:
Osteosarcoma (OS) is the most common primary bone cancer in children and adolescents. Despite aggressive treatment regimens, the outcome is unsatisfactory, and multidrug resistance (MDR) is a pivotal process in OS treatment failure. OS-derived extracellular vesicles (EVs) promote drug resistance to chemotherapy and target therapy through different mechanisms. The aim of this study was to identify subpopulations of osteosarcoma-EVs by Fourier transform infrared spectroscopy (FT-IR) to define a specific spectral signature for sensitive and multidrug-resistant OS-derived EVs. EVs were isolated from sensitive and MDR OS cells as well as from mesenchymal stem cells by differential centrifugation and ultracentrifugation. EVs size, morphology and protein expression were characterized. FT-IR/ATR of EVs spectra were acquired in the region of 400-4000 cm-1 (resolution 4 cm-1, 128 scans). The FT-IR spectra obtained were consistently different in the EVs compared to cells from which they originate. A specific spectral signature, characterized by a shift and a new band (1601 cm-1), permitted to clearly distinguish EVs isolated by sensitive and multidrug-resistant OS cells. Our data suggest that FT-IR spectroscopy allows to characterize and define a specific spectral signature for sensitive and MDR OS-derived EVs.
Insights
Fourier transform infrared spectroscopy (FT-IR) can identify specific spectral signatures of extracellular vesicles (EVs) from osteosarcoma (OS) cells. This method distinguishes between drug-sensitive and multidrug-resistant (MDR) OS-derived EVs, aiding in understanding treatment failure.
Area of Science:
- Biochemistry
- Oncology
- Spectroscopy
Background:
- Osteosarcoma (OS) is a primary bone cancer with poor outcomes, often due to multidrug resistance (MDR).
- Extracellular vesicles (EVs) derived from OS cells contribute to MDR through various mechanisms.
- Current therapeutic strategies for OS face challenges due to treatment resistance.
Purpose of the Study:
- To identify distinct subpopulations of osteosarcoma-EVs.
- To define a specific spectral signature for sensitive and MDR OS-derived EVs using FT-IR.
- To explore FT-IR spectroscopy as a tool for characterizing EVs in OS.
Main Methods:
- Isolation of EVs from sensitive and MDR OS cells, and mesenchymal stem cells using differential centrifugation and ultracentrifugation.
- Characterization of EVs' size, morphology, and protein expression.
- Acquisition of FT-IR/ATR spectra of EVs in the 400-4000 cm⁻¹ region.
Main Results:
- FT-IR spectra of EVs differed significantly from their originating cells.
- A unique spectral signature, including a band shift and a new band at 1601 cm⁻¹, was identified.
- This signature allowed clear differentiation between EVs from sensitive and MDR OS cells.
Conclusions:
- FT-IR spectroscopy is effective in characterizing osteosarcoma-derived EVs.
- A specific spectral signature can distinguish between sensitive and MDR OS-derived EVs.
- This finding may contribute to understanding and overcoming MDR in osteosarcoma treatment.
