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- W1973804925 abstract "In vivo bioluminescence imaging depends on light emitted by luciferases in the body overcoming the effect of tissue attenuation. Understanding this relationship is essential for detection and quantification of signal. We have studied four codon optimized luciferases with different emission spectra, including enzymes from firefly (FLuc), click beetle (CBGr68, CBRed) and Renilla reniformins (hRLuc). At 25 degrees C, the in vitro lambda(max) of these reporters are 578, 543, 615, and 480 nm, respectively; at body temperature, 37 degrees C, the brightness increases and the firefly enzyme demonstrates a 34-nm spectral red shift. Spectral shifts and attenuation due to tissue effects were evaluated using a series of 20-nm bandpass filters and a cooled charge-coupled device (CCD) camera. Attenuation increased and the spectra of emitted light was red shifted for signals originating from deeper within the body relative to superficial origins. The tissue attenuation of signals from CBGr68 and hRLuc was greater than from those of Fluc and CBRed. To further probe tissue effects, broad spectral emitters were created through gene fusions between CBGr68 and CBRed. These resulted in enzymes with broader emission spectra, featuring two peaks whose intensities are differentially affected by temperature and tissue depth. These spectral measurement data allow for improved understanding of how these reporters can be used in vivo and what they can reveal about biological processes in living subjects." @default.
- W1973804925 created "2016-06-24" @default.
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- W1973804925 date "2005-01-01" @default.
- W1973804925 modified "2023-10-02" @default.
- W1973804925 title "Emission spectra of bioluminescent reporters and interaction with mammalian tissue determine the sensitivity of detection in vivo" @default.
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- W1973804925 doi "https://doi.org/10.1117/1.2032388" @default.
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