Evaluating Brightness and Spectral Properties of Click Beetle and Firefly Luciferases Using Luciferin Analogues: Identification of Preferred Pairings of Luciferase and Substrate for In Vivo Bioluminescence Imaging.

Details

Serval ID
serval:BIB_1FD4332877FF
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Evaluating Brightness and Spectral Properties of Click Beetle and Firefly Luciferases Using Luciferin Analogues: Identification of Preferred Pairings of Luciferase and Substrate for In Vivo Bioluminescence Imaging.
Journal
Molecular imaging and biology
Author(s)
Zambito G., Gaspar N., Ridwan Y., Hall M.P., Shi C., Kirkland T.A., Encell L.P., Löwik C., Mezzanotte L.
ISSN
1860-2002 (Electronic)
ISSN-L
1536-1632
Publication state
Published
Issued date
12/2020
Peer-reviewed
Oui
Volume
22
Number
6
Pages
1523-1531
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Currently, a variety of red and green beetle luciferase variants are available for bioluminescence imaging (BLI). In addition, new luciferin analogues providing longer wavelength luminescence have been developed that show promise for improved deep tissue imaging. However, a detailed assessment of these analogues (e.g., Akalumine-HCl, CycLuc1, and amino naphthyl luciferin (NH <sub>2</sub> -NpLH2)) combined with state of the art luciferases has not been performed. The aim of this study was to evaluate for the first time the in vivo brightness and spectral characteristics of firefly (Luc2), click beetle green (CBG99), click beetle red 2 (CBR2), and Akaluc luciferases when paired with different D-luciferin (D-LH2) analogues in vivo.
Transduced human embryonic kidney (HEK 293T) cells expressing individual luciferases were analyzed both in vitro and in mice (via subcutaneous injection). Following introduction of the luciferins to cells or animals, the resulting bioluminescence signal and photon emission spectrum were acquired using a sensitive charge-coupled device (CCD) camera equipped with a series of band pass filters and spectral unmixing software.
Our in vivo analysis resulted in four primary findings: (1) the best substrate for Luc2, CBG99, and CBR2 in terms of signal strength was D-luciferin; (2) the spectra for Luc2 and CBR2 were shifted to a longer wavelength when Akalumine-HCl was the substrate; (3) CBR2 gave the brightest signal with the near-infrared substrate, NH <sub>2</sub> -NpLH2; and (4) Akaluc was brighter when paired with either CycLuc1 or Akalumine-HCl when paired with D-LH2.
We believe that the experimental results described here should provide valuable guidance to end users for choosing the correct luciferin/luciferase pairs for a variety of BLI applications.
Keywords
Bioluminescence, Emission spectrum, In vivo imaging, Luciferase, Luciferin
Pubmed
Web of science
Open Access
Yes
Create date
19/09/2020 12:14
Last modification date
23/11/2020 6:24
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