Abstract
Purpose
Mitochondria are a gatekeeper of cell survival and mitochondrial function can be used to monitor cell stress. Here we validate a pathway-specific reporter gene to noninvasively image the mitochondrial function of stem cells.
Procedures
We constructed a mitochondrial sensor with the firefly luciferase (Fluc) reporter gene driven by the NQO1 enzyme promoter. The sensor was introduced in stem cells and validated in vitro and in vivo, in a mouse model of myocardial ischemia/reperfusion (IR).
Results
The sensor activity showed an inverse relationship with mitochondrial function (R 2 = −0.975, p = 0.025) and showed specificity and sensitivity for mitochondrial dysfunction. In vivo, NQO1-Fluc activity was significantly higher in IR animals vs. controls, indicative of mitochondrial dysfunction, and was corroborated by ex vivo luminometry.
Conclusions
Reporter gene imaging allows assessment of the biology of transplanted mesenchymal stromal cells (MSCs), providing important information that can be used to improve the phenotype and survival of transplanted stem cells.
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Acknowledgments
This study was supported in part by the National Institutes of Health awards R56 HL113371 (MR-P) and RO1CA161091 (RP). We acknowledge the Todd and Karen Wanek Family Program for Hypoplastic Left Heart Syndrome for the assistance with the metabolic analysis of stem cells (Seahorse experiments). The luminometer used was obtained through a grant from Turner Biosystems, Sunnyvale, CA.
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Conflict of Interest. The authors declare that they have no conflict of interest.
Ethical Approval. All applicable institutional and/or national guidelines for the care and use of animals were followed.
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Federico Franchi and Karen M. Peterson contributed equally to this work.
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Franchi, F., Peterson, K.M., Paulmurugan, R. et al. Noninvasive Monitoring of the Mitochondrial Function in Mesenchymal Stromal Cells. Mol Imaging Biol 18, 510–518 (2016). https://doi.org/10.1007/s11307-016-0929-x
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DOI: https://doi.org/10.1007/s11307-016-0929-x