4.8 Article

High intensity focused ultrasound hyperthermia for enhanced macromolecular delivery

期刊

JOURNAL OF CONTROLLED RELEASE
卷 241, 期 -, 页码 186-193

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2016.09.030

关键词

Macromolecular delivery; High intensity focused ultrasound; Hyperthermia; Drug delivery; Magnetic resonance imaging

资金

  1. National Institutes of Health [P30 CA042014]
  2. Experimental Therapeutics Program of the Huntsman Cancer Institute

向作者/读者索取更多资源

Mild hyperthermia has been used in combination with polymer therapeutics to further increase delivery to solid tumors and enhance efficacy. An attractive method for generating heat is through non-invasive high intensity focused ultrasound (HIFU). HIFU is often used for ablative therapies and must be adapted to produce uniform mild hyperthermia in a solid tumor. In this work a magnetic resonance imaging guided HIFU (MRgHIFU) controlled feedback system was developed to produce a spatially uniform 43 degrees C heating pattern in a subcutaneous mouse tumor. MRgHIFU was employed to create hyperthermic conditions that enhance macromolecular delivery. Using a mouse model with two subcutaneous tumors, it was demonstrated that MRgHIFU enhanced delivery of both Evans blue dye (EBD) and Gadolinium-chelated N-(2-hydroxypropyl) methacrylamide (HPMA) copolymers. The EBD accumulation in the heated tumors increased by nearly 2-fold compared to unheated tumors. The Gadolinium-chelated HPMA copolymers also showed significant enhancement in accumulation over control as evaluated through MRI T1-mapping measurements. Results show the potential of HIFU-mediated hyperthermia for enhanced delivery of polymer therapeutics. (C) 2016 Elsevier B.V. All rights reserved.

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