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DNA double-strand breaks induced by cavitational mechanical effects of ultrasound in cancer cell lines.


ABSTRACT: Ultrasonic technologies pervade the medical field: as a long established imaging modality in clinical diagnostics; and, with the emergence of targeted high intensity focused ultrasound, as a means of thermally ablating tumours. In parallel, the potential of [non-thermal] intermediate intensity ultrasound as a minimally invasive therapy is also being rigorously assessed. Here, induction of apoptosis in cancer cells has been observed, although definitive identification of the underlying mechanism has thus far remained elusive. A likely candidate process has been suggested to involve sonochemical activity, where reactive oxygen species (ROS) mediate the generation of DNA single-strand breaks. Here however, we provide compelling new evidence that strongly supports a purely mechanical mechanism. Moreover, by a combination of specific assays (neutral comet tail and staining for ?H2AX foci formation) we demonstrate for the first time that US exposure at even moderate intensities exhibits genotoxic potential, through its facility to generate DNA damage across multiple cancer lines. Notably, colocalization assays highlight that ionizing radiation and ultrasound have distinctly different signatures to their respective ?H2AX foci formation patterns, likely reflecting the different stress distributions that initiated damage formation. Furthermore, parallel immuno-blotting suggests that DNA-PKcs have a preferential role in the repair of ultrasound-induced damage.

SUBMITTER: Furusawa Y 

PROVIDER: S-EPMC3250400 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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DNA double-strand breaks induced by cavitational mechanical effects of ultrasound in cancer cell lines.

Furusawa Yukihiro Y   Fujiwara Yoshisada Y   Campbell Paul P   Zhao Qing-Li QL   Ogawa Ryohei R   Hassan Mariame Ali MA   Tabuchi Yoshiaki Y   Takasaki Ichiro I   Takahashi Akihisa A   Kondo Takashi T  

PloS one 20120103 1


Ultrasonic technologies pervade the medical field: as a long established imaging modality in clinical diagnostics; and, with the emergence of targeted high intensity focused ultrasound, as a means of thermally ablating tumours. In parallel, the potential of [non-thermal] intermediate intensity ultrasound as a minimally invasive therapy is also being rigorously assessed. Here, induction of apoptosis in cancer cells has been observed, although definitive identification of the underlying mechanism  ...[more]

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