Journal
INTERNATIONAL JOURNAL OF PHARMACEUTICS
Volume 415, Issue 1-2, Pages 315-318Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijpharm.2011.05.068
Keywords
Gold nanorods; Hyperthermia; Enhanced permeability and retention (EPR); Plasmonic photothermal therapy (PPTT); Permeability
Categories
Funding
- National Institutes of Health [R01 EB007171]
- Department of Defense [PC094496]
- Utah Science Technology and Research (USTAR) Initiative
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Plasmonic photothermal therapy (PPTT) with gold nanostructures has been used to generate significant heat within tumors to ablate vasculature. Here we report the use of gold nanorod (GNR) mediated PPTT to induce moderate hyperthermia as a tool to enhance the delivery of macromolecules. GNRs were injected intravenously in a mouse sarcoma (S-180) tumor model. After 24 h Evans blue dye (EBD) was injected and the right tumor was radiated with a laser diode for 10 min. EBD content in the right and left tumors were extracted in formamide, measured spectrophotometrically and expressed as a thermal enhancement ratio (TER). Enhanced delivery of EBD was observed (up to 1.8-fold) when tumor temperatures reached 43 degrees C or 46 degrees C. No statistical difference was observed between tumors at these two temperatures, though significant hemorrhage was observed in tumors and surrounding areas receiving the higher thermal dose (46 degrees C). These results indicate that tumor directed PPTT may be used to induce moderate hyperthermia and therefore selectively increase the delivery of macromolecules with therapeutic anticancer drugs. (C) 2011 Elsevier B.V. All rights reserved.
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