Volume 59, Issue 12 pp. 4678-4683
Research Article

Photoacoustic Imaging Quantifies Drug Release from Nanocarriers via Redox Chemistry of Dye-Labeled Cargo

Ananthakrishnan Soundaram Jeevarathinam

Ananthakrishnan Soundaram Jeevarathinam

Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093 USA

These authors contributed equally to this work.

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Jeanne E. Lemaster

Jeanne E. Lemaster

Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093 USA

These authors contributed equally to this work.

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Fang Chen

Fang Chen

Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093 USA

Department of Radiology, University of California San Diego, 9500 Gilman Dr., La Jolla, CA, 92093 USA

Current address: Stanford University, USA

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Eric Zhao

Eric Zhao

Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093 USA

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Assoc. Prof. Jesse V. Jokerst

Corresponding Author

Assoc. Prof. Jesse V. Jokerst

Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093 USA

Materials Science and Engineering Program, University of California San Diego, 9500 Gilman Dr., La Jolla, CA, 92093 USA

Department of Radiology, University of California San Diego, 9500 Gilman Dr., La Jolla, CA, 92093 USA

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First published: 15 December 2019
Citations: 68

Graphical Abstract

A covalently linked paclitaxel–methylene blue conjugate (PTX-MB) is used for real-time monitoring of drug release from nanocarriers via photoacoustic imaging. The PTX-MB remained in acoustically silent form when encapsulated in poly(lactic-co-glycolic acid) (PLGA) nanoparticles. After release, PTX-MB instantly oxidized to the photoacoustically active form to report quantity and biodistribution.

Abstract

We report a new approach to monitor drug release from nanocarriers via a paclitaxel–methylene blue conjugate (PTX-MB) with redox activity. This construct is in a photoacoustically silent reduced state inside poly(lactic-co-glycolic acid) (PLGA) nanoparticles (PTX-MB@PLGA NPs). During release, PTX-MB is spontaneously oxidized to produce a concentration-dependent photoacoustic signal. An in vitro drug-release study showed an initial burst release (25 %) between 0–24 h and a sustained release between 24–120 h with a cumulative release of 40.6 % and a 670-fold increase in photoacoustic signal. An in vivo murine drug release showed a photoacoustic signal enhancement of up to 649 % after 10 hours. PTX-MB@PLGA NPs showed an IC50 of 78 μg mL−1 and 44.7±4.8 % decrease of tumor burden in an orthotopic model of colon cancer via luciferase-positive CT26 cells.

Conflict of interest

The authors declare no conflict of interest.

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