Shine on: A new rationaldesign strategy for near‐infrared‐emitting fireflyluciferins that are available in vivo has been developed using intramolecular bioluminescence resonance energy transfer (BRET). The emission wavelength could be freely tuned by the choice of BRET acceptor, and NIR bioluminescence could be detected in living cells and mice without the need for luciferase manipulation.
Catch and release microwave mediated synthesis of cyanine dyes
作者:Maria Lopalco、Eftychia N. Koini、Jin Ku Cho、Mark Bradley
DOI:10.1039/b820719b
日期:——
Unsymmetrical functionalised cyanine dyes, covering the whole colour range, were readily synthesised (in 100 mg amounts) by a combination of microwave and solid-phase methodologies.
We report a fully reversible off-onfluorescenceprobe for hypoxia. The design employs QSY-21 as a Förster resonance energy transfer (FRET) acceptor and cyanine dye Cy5 as a FRET donor, based on our finding that QSY-21 undergoes one-electron bioreduction to the radical under hypoxia, with an absorbance decrease at 660 nm. At that point, FRET can no longer occur, and the dye becomes strongly fluorescent
Based on the findings that the azo functional group has excellent properties as the hypoxia-sensor moiety, we developed hypoxia-sensitive near-infrared fluorescent probes in which a large fluorescence increase is triggered by the cleavage of an azo bond. The probes were used for fluorescence imaging of hypoxic cells and real-time monitoring of ischemia in the liver and kidney of live mice.