Distinct ON/OFF fluorescence signals from dual-responsive activatable nanoprobes allows detection of inflammation with improved contrast

作者：Viger Mathieu L; Collet Guillaume; Lux Jacques; Viet Anh Nguyen Huu; Guma Monica; Foucault Collet Alexandra; Olejniczak Jason; Joshi Barr Shivanjali; Firestein Gary S; Almutairi Adah^*

来源：Biomaterials, 2017, 133: 119-131.

DOI：10.1016/j.biomaterials.2017.03.042

• Molecular imaging
• Inflammatory microenvironments
• NIR optical nanoprobes
• Stimuli-responsive polymers
• Spectrally-resolved imaging

Visualization of biochemical changes associated with disease is of great clinical significance, as it should allow earlier, more accurate diagnosis than structural imaging, facilitating timely clinical intervention. Herein, we report combining stimuli-responsive polymers and near-infrared fluorescent dyes (emission max: 790 nm) to create robust activatable fluorescent nanoprobes capable of simultaneously detecting acidosis and oxidative stress associated with inflammatory microenvironments. The spectrally-resolved mechanism of fluorescence activation allows removal of unwanted background signal (up to 20-fold reduction) and isolation of a pure activated signal, which enables sensitive and unambiguous localization of inflamed areas; target-to-background ratios reach 22 as early as 3 h post-injection. This new detection platform could have significant clinical impact in early detection of pathologies, individual tailoring of drug therapy, and image-guided tumor resection.

• 出版日期2017-7