Dynamic bioluminescence imaging for quantitative tumour burden assessment using IV or IP administration of <Emphasis Type="SmallCaps">d</Emphasis>-luciferin: effect on intensity,time kinetics and repeatability of photon emission |
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Authors: | Marleen Keyaerts Jacob Verschueren Tomas J Bos Lea Olive Tchouate-Gainkam Cindy Peleman Karine Breckpot Chris Vanhove Vicky Caveliers Axel Bossuyt Tony Lahoutte |
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Institution: | (1) In Vivo Cellular and Molecular Imaging (ICMI) Laboratory, Vrije Universiteit Brussel (VUB), Brussels, Belgium;(2) Department of Nuclear Medicine, University Hospital Brussels (UZ-Brussel), Laarbeeklaan 101, 1090 Brussels, Belgium;(3) Bio-Imaging lab, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium;(4) Department of Haematology and Immunology, Vrije Universiteit Brussel (VUB), Brussels, Belgium;(5) Laboratory of Molecular and Cellular Therapy, Department of Physiology and Immunology, Vrije Universiteit Brussel (VUB), Brussels, Belgium |
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Abstract: | Introduction In vivo bioluminescence imaging (BLI) is a promising technique for non-invasive tumour imaging. d-luciferin can be administrated intraperitonealy or intravenously. This will influence its availability and, therefore, the
bioluminescent signal. The aim of this study is to compare the repeatability of BLI measurement after IV versus IP administration
of d-luciferin and assess the correlation between photon emission and histological cell count both in vitro and in vivo.
Materials and methods Fluc-positive R1M cells were subcutaneously inoculated in nu/nu mice. Dynamic BLI was performed after IV or IP administration
of d-luciferin. Maximal photon emission (PEmax) was calculated. For repeatability assessment, every acquisition was repeated after 4 h and analysed using Bland–Altman method.
A second group of animals was serially imaged, alternating IV and IP administration up to 21 days. When mice were killed,
PEmax after IV administration was correlated with histological cell number.
Results The coefficients of repeatability were 80.2% (IV) versus 95.0% (IP). Time-to-peak is shorter, and its variance lower for IV
(p < 0.0001). PEmax was 5.6 times higher for IV. A trend was observed towards lower photon emission per cell in larger tumours.
Conclusion IV administration offers better repeatability and better sensitivity when compared to IP. In larger tumours, multiple factors
may contribute to underestimation of tumour burden. It might, therefore, be beneficial to test novel therapeutics on small
tumours to enable an accurate evaluation of tumour burden.
Marleen Keyaerts is a Ph. D. fellow of the Research Foundation—Flanders (Belgium; FWO). |
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Keywords: | Tumour imaging Small animal imaging Molecular imaging Bioluminescence imaging Animal model |
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