Noninvasive and Spatiotemporal Control of DNAzyme-Based Imaging of Metal Ions in Vivo Using High-Intensity Focused Ultrasound

Xiaojing Wang, Gun Kim, James L. Chu, Tingjie Song, Zhenglin Yang, Weijie Guo, Xiangli Shao, Michael L. Oelze, King C. Li, Yi Lu

Research output: Contribution to journalArticlepeer-review

Abstract

Detecting metal ions in vivo with a high spatiotemporal resolution is critical to understanding the roles of the metal ions in both healthy and disease states. Although spatiotemporal controls of metal-ion sensors using light have been demonstrated, the lack of penetration depth in tissue and in vivo has limited their application. To overcome this limitation, we herein report the use of high-intensity focused ultrasound (HIFU) to remotely deliver on-demand, spatiotemporally resolved thermal energy to activate the DNAzyme sensors at the targeted region both in vitro and in vivo. A Zn2+-selective DNAzyme probe is inactivated by a protector strand to block the formation of catalytic enzyme structure, which can then be activated by an HIFU-induced increase in the local temperature. With this design, Zn2+-specific fluorescent resonance energy transfer (FRET) imaging has been demonstrated by the new DNAzyme-HIFU probes in both HeLa cells and mice. The current method can be applied to monitor many other metal ions for in vivo imaging and medical diagnosis using metal-specific DNAzymes that have either been obtained or can be selected using in vitro selection.

Original languageEnglish (US)
Pages (from-to)5812-5819
Number of pages8
JournalJournal of the American Chemical Society
Volume144
Issue number13
DOIs
StatePublished - Apr 6 2022

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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