Dynamic bioluminescence imaging for quantitative tumour burden assessment using IV or IP administration of D: -luciferin: effect on intensity, time kinetics and repeatability of photon emission

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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73 Citations (Scopus)

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 (PE(max)) 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, PE(max) 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). PE(max) 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.

Original languageEnglish
Pages (from-to)999-1007
Number of pages9
JournalEuropean Journal of Nuclear Medicine and Molecular Imaging
Volume35
Issue number5
DOIs
Publication statusPublished - 2008

Keywords

  • Animals
  • Cell Line, Tumor
  • Contrast Media
  • Firefly Luciferin
  • Injections, Intraperitoneal
  • Injections, Intravenous
  • Kinetics
  • Light
  • Luminescent Measurements
  • Male
  • Mice
  • Mice, Nude
  • Rhabdomyosarcoma

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