Highlights
- •This study assesses the usability of a variety of tracers for a recently developed, highly sensitive, quantitative and non-destructive method for evaluating the in vitro amount of mineral produced by osteogenic differentiated mesenchymal stem cells in a monolayer cell culture using the radioactive tracer 99mTechnetium.
- •The presented results suggest that the novel method works superbly with all three commercially available 99mTechnetium tracers (MDP, DPD, HDP) and therefore this method can be used worldwide.
- •Furthermore, the timepoint when the labelling is performed is of little importance, which makes the planning and scheduling of osteogenic stem cell experiments more flexible.
Abstract
Bone tissue engineering is a fast-growing field in regenerative medicine. Consequently,
there is a high demand for new, fast and reliable methods to track and quantify the
osteogenic differentiation of cells. Recently, a novel method was published to non-destructively
quantify the hydroxyapatite content of monolayer and 3-dimensional mesenchymal stem
cell cultures using the ability of 99mTechnetium-methylene diphosphonate (MDP), a well-established tracer in clinical nuclear
medicine, to bind to newly synthesized hydroxyapatite. In the present study, two other
commonly used 99mTechnetium tracers, 2,3-dicarboxypropane-1,1-diphosphonate (DPD) and hydroxydiphosphonate
(HDP), were evaluated to see if they could also be used for the same purpose. Furthermore,
we investigated if labelling at various timepoints influenced the effectiveness of
the labelling. The results were analysed using one-factor ANOVA followed by Bonferroni
post-hoc testing. This revealed a highly significant difference between the three
osteogenic groups at each timepoint compared to their corresponding negative controls.
However, there was no statistically significant difference between the three different
tracers (MDP, DPD, HDP) in the osteogenic groups. Therefore all three tracers are
of similar value when quantifying the extracellular hydroxylapatite content in osteogenic
stem cells cultures.
Keywords
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Article info
Publication history
Published online: December 30, 2020
Accepted:
December 17,
2020
Footnotes
This paper is part of a supplement supported by the European Society of Tissue Regeneration in Orthopaedics and Traumatology (ESTROT).
Identification
Copyright
© 2020 Elsevier Ltd. All rights reserved.
