Polymethine Thiopyrylium Fluorophores with Absorption beyond 1000 nm for Biological Imaging in the Second Near-infrared Sub-window
Journal Article
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· Journal of Medicinal Chemistry
- Wuhan Univ. School of Pharmaceutical Sciences, Wuhan (China); Stanford Univ., Stanford, CA (United States); Wuhan University School of Pharmaceutical Sciences
- Wuhan Univ. School of Pharmaceutical Sciences, Wuhan (China)
- Stanford Univ., Stanford, CA (United States)
- Tibet Univ., Lasa (China)
- Wuhan Univ. School of Pharmaceutical Sciences, Wuhan (China); Tibet Univ., Lasa (China); Shenzhen Institute of Wuhan Univ., Shenzhen (China)
Small-molecule fluorescence imaging in the second near-infrared (NIR-II, 1000-1700 nm) window has gained increasing interest in clinical application. Till now, very few studies have been exploited in the small-molecule fluorophores with both excitation and emission in the NIR-II window. Inspired by indocyanine green structure, a series of polymethine dyes with both absorption and emission in NIR-II window have been developed for NIR-II imaging, providing the feasibility to directly compare optical imaging in NIR-IIa (1300-1400 nm) sub-window under 1064 nm excitation with that in NIR-II window under 808 nm excitation. The signal-background ratio (SBR) and tumor to normal tissue ratio (T/NT) achieved great improvement under 1064 nm excitation in the imaging of mouse blood pool and U87 glioma tumors. Furthermore, our study not only introduces a broadband emission fluorophore for both NIR-II and NIR-IIa imaging, but also reveals the advantages of NIR-II excitation over NIR-I in in vivo imaging.
- Research Organization:
- The Leland Stanford Junior Univ., Palo Alto, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0008397
- OSTI ID:
- 1485259
- Journal Information:
- Journal of Medicinal Chemistry, Journal Name: Journal of Medicinal Chemistry Journal Issue: 4 Vol. 62; ISSN 0022-2623
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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