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Use of EPR and FTIR to detect biological effects of ultrasound and microbubbles on a fibroblast cell line

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Abstract

Structural and functional effects of exposing murine fibroblasts (NIH 3T3) to therapeutic ultrasound at 1 MHz frequency are described. These bioeffects can be attributed to the formation of free radical species by sonolysis of water. When cavitation occurs, dissociation of water vapor into H atoms and OH radicals is observed; these H atoms and OH radicals combine to form H2, H2O2, and HO2. The radicals can chemically modify biomolecules, for example enzymes, DNA, and lipids. Generation of free radicals during exposure to ultrasound with or without encapsulated microbubbles (contrast agents) was studied by use of electron paramagnetic resonance with DMPO spin trapping. Recently the potential for possible use of these microbubbles in gene therapy has been investigated, because of the ability of the stabilized microbubbles to release their content when exposed to ultrasound. Structural changes were studied by Fourier-transform infrared spectroscopy, and induction of possible genotoxic damage by exposure of the cells to therapeutic ultrasound at 1 MHz frequency with our experimental device was verified by use of the cytokinesis-block micronucleus assay.

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Correspondence to D. Pozzi.

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Special Issue: SIBPA 2011 Meeting.

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Pozzi, D., Fattibene, P., Viscomi, D. et al. Use of EPR and FTIR to detect biological effects of ultrasound and microbubbles on a fibroblast cell line. Eur Biophys J 40, 1115–1120 (2011). https://doi.org/10.1007/s00249-011-0738-8

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  • DOI: https://doi.org/10.1007/s00249-011-0738-8

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