Enhancement of Small Molecule Delivery by Pulsed High-Intensity Focused Ultrasound: A Parameter Exploration

Yufeng Zhou, Yak Nam Wang, Navid Farr, Jasmine Zia, Hong Chen, Bong Min Ko, Tatiana Khokhlova, Tong Li, Joo Ha Hwang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Chemotherapeutic drug delivery is often ineffective within solid tumors, but increasing the drug dose would result in systemic toxicity. The use of high-intensity focused ultrasound (HIFU) has the potential to enhance penetration of small molecules. However, operation parameters need to be optimized before the use of chemotherapeutic drugs in vivo and translation to clinical trials. In this study, the effects of pulsed HIFU (pHIFU) parameters (spatial-average pulse-average intensity, duty factor and pulse repetition frequency) on the penetration as well as content of small molecules were evaluated in ex vivo porcine kidneys. Specific HIFU parameters resulted in more than 40 times greater Evans blue content and 3.5 times the penetration depth compared with untreated samples. When selected parameters were applied to porcine kidneys in vivo, a 2.3-fold increase in concentration was obtained after a 2-min exposure to pHIFU. Pulsed HIFU has been found to be an effective modality to enhance both the concentration and penetration depth of small molecules in tissue using the optimized HIFU parameters. Although, performed in normal tissue, this study has the promise of translation into tumor tissue.

Original languageEnglish
Pages (from-to)956-963
Number of pages8
JournalUltrasound in Medicine and Biology
Volume42
Issue number4
DOIs
StatePublished - Apr 1 2016

Keywords

  • Content and penetration
  • Drug delivery
  • Kidney
  • Pulsed-high intensity focused ultrasound
  • Ultrasound parameters

Fingerprint

Dive into the research topics of 'Enhancement of Small Molecule Delivery by Pulsed High-Intensity Focused Ultrasound: A Parameter Exploration'. Together they form a unique fingerprint.

Cite this