Journal
ACS SENSORS
Volume 6, Issue 1, Pages 123-129Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.0c01926
Keywords
photoacoustic imaging; fluorescence; pH-activatable; tumor targeting; cyanine dyes
Funding
- MEXT, Japan [18H04404, 20H02811, 2707, 20J15123]
- Naito Foundation
- Ogasawara Foundation for the Promotion of Science Engineering
- Grants-in-Aid for Scientific Research [20J15123, 20H02811, 18H04404] Funding Source: KAKEN
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Photoacoustic (PA) imaging, coupled with fluorescence imaging, offers high resolution imaging within deep tissue. A new pH-activatable sensor, CypHRGD, was developed for fluorescence/PA multimodality imaging with improved sensitivity and specificity. Its applications in cell cultures and cancer-xenografted mice demonstrated rapid kinetics and high biocompatibility.
Photoacoustic (PA) imaging is an emerging molecular imaging modality that complements fluorescence imaging and enables high resolution within deep tissue. Fluorescence/PA multimodality imaging would be a powerful technique to extract more comprehensive information from targets than traditional single-modality imaging. In this paper, we developed a new pH-activatable sensor, CypHRGD, which is applicable to both fluorescence and PA detection. CypHRGD was derived from our previous near-infrared pH-sensing platform, in which substitution with a bulky phenyl group and functionalization with a cRGD peptide remarkably improved the sensor's biocompatibility with attenuated dye aggregation. The multi-modality imaging applications of CypHRGD were demonstrated in cultured cells and cancer-xenografted mice with rapid kinetics and high sensitivity and specificity, which relies on cRGD-facilitated tumor targeting, probe accumulation and subsequent activation in the acidic organelles after endocytosis.
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