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Membrane disruption by optically controlled microbubble cavitation

Abstract

In fluids, pressure-driven cavitation bubbles have a nonlinear response that can lead to extremely high core-energy densities during the collapse phase—a process underpinning phenomena such as sonoluminescence1 and plasma formation2. If cavitation occurs near a rigid surface, the bubbles tend to collapse asymmetrically, often forming fast-moving liquid jets that may create localized surface damage3. As encapsulated microbubbles are commonly used to improve echo generation in diagnostic ultrasound imaging, it is possible that such cavitation could also lead to jet-induced tissue damage. Certainly ultrasonic irradiation (insonation) of cells in the presence of microbubbles can lead to enhanced membrane permeabilization and molecular uptake (sonoporation)4,5,6,7, but, although the mechanism during low-intensity insonation is clear8, experimental corroboration for higher pressure regimes has remained elusive. Here we show direct observational evidence that illuminates the energetic micrometre-scale interactions between individual cells and violently cavitating shelled microbubbles. Our data suggest that sonoporation at higher intensities may arise through a synergistic interplay involving several distinct processes.

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Figure 1: Apparatus and configuration of the optically trapped microbubble in relation to a coverslip/monolayer system.
Figure 2: Representative UHS sequences acquired at a framing rate of 500 kHz showing microbubble cavitation, in proximity to naked coverslips (a, b) and at cell monolayers (c, d).
Figure 3: Correlation of specific cavitation events with membrane damage.

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Acknowledgements

We thank the EPSRC, SHEFC and National Institutes for Health for financial support and the EPSRC equipment loan pool (A. Walker and P. Anthony) for use of the high-speed imaging systems. We also gratefully acknowledge advice and assistance from V. Zarnitzyn and M. Postema (sonoporation), D. McLean (technical construction), M. McDonald (optical trapping) and J. Christophe Bourdon and P. Robertson (cell culture).

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Correspondence to Paul Campbell.

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M. R. P. is on the advisory board of Cytodome. The rest of the authors declare that they have no competing financial interests.

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Prentice, P., Cuschieri, A., Dholakia, K. et al. Membrane disruption by optically controlled microbubble cavitation. Nature Phys 1, 107–110 (2005). https://doi.org/10.1038/nphys148

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