Redox-responsive Branched-bottlebrush Polymers for in Vivo MRI and Fluorescence Imaging

Overview

Journal Nat Commun

Specialty Biology

Date 2014 Nov 19

PMID 25403521

Citations 63

Authors

Molly A Sowers

Jessica R McCombs

Ying Wang

Joseph T Paletta

Stephen W Morton

Erik C Dreaden

Michael D Boska

M Francesca Ottaviani

Paula T Hammond

Andrzej Rajca

Jeremiah A Johnson

Affiliations

Soon will be listed here.

Abstract

Stimuli-responsive multimodality imaging agents have broad potential in medical diagnostics. Herein, we report the development of a new class of branched-bottlebrush polymer dual-modality organic radical contrast agents--ORCAFluors--for combined magnetic resonance and near-infrared fluorescence imaging in vivo. These nitroxide radical-based nanostructures have longitudinal and transverse relaxation times that are on par with commonly used heavy-metal-based magnetic resonance imaging (MRI) contrast agents. Furthermore, these materials display a unique compensatory redox response: fluorescence is partially quenched by surrounding nitroxides in the native state; exposure to ascorbate or ascorbate/glutathione leads to nitroxide reduction and a concomitant 2- to 3.5-fold increase in fluorescence emission. This behaviour enables correlation of MRI contrast, fluorescence intensity and spin concentration with tissues known to possess high concentrations of ascorbate in mice. Our in vitro and in vivo results, along with our modular synthetic approach, make ORCAFluors a promising new platform for multimodality molecular imaging.

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