Abstract
Stem cells transplantation has emerged as a promising alternative therapeutic due to its potency at injury site. The need to monitor and non-invasively track the infused stem cells is a significant challenge in the development of regenerative medicine. Thus, in vivo tracking to monitor infused stem cells is especially vital. In this manuscript, we have described an effective in vitro labelling method of MSCs, a serial in vivo tracking of implanted stem cells at traumatic brain injury (TBI) site through 7 T magnetic resonance imaging (MRI). Proper homing of infused MSCs was carried out at different time points using histological analysis and Prussian blue staining. Longitudinal in vivo tracking of infused MSCs were performed up to 21 days in different groups through MRI using relaxometry technique. Results demonstrated that MSCs incubated with iron oxide-poly-L-lysine complex (IO-PLL) at a ratio of 50:1.5 μg/ml and a time period of 6 h was optimised to increase labelling efficiency. T2*-weighted images and relaxation study demonstrated a significant signal loss and effective decrease in transverse relaxation time on day-3 at injury site after systemic transplantation, revealed maximum number of stem cells homing to the lesion area. MRI results further correlate with histological and Prussian blue staining in different time periods. Decrease in negative signal and increase in relaxation times were observed after day-14, may indicate damage tissue replacement with healthy tissue. MSCs tracking with synthesized negative contrast agent represent a great advantage during both in vitro and in vivo analysis. The proposed absolute bias correction based relaxometry analysis could be extrapolated for stem cell tracking and therapies in various neurodegenerative diseases.
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Abbreviations
- ANOVA:
-
Analysis of variance
- FBS:
-
Foetal Bovine Serum
- FOV:
-
Field of view
- ICC:
-
Immunocytochemistry
- ISA:
-
Imaging sequence analysis
- MGE:
-
Multi Gradient Echo
- MRI:
-
Magnetic resonance imaging
- MSCs:
-
Mesenchymal Stem Cells
- mMSCs:
-
mice MSCs
- MSME:
-
Multi Slice Multi Echo
- PCR:
-
Polymerase chain reaction
- PLL:
-
Poly-L-lysine
- ROI:
-
Region of interest
- R2 :
-
Transverse relaxation rate
- T2 :
-
Transverse relaxation time
- TR:
-
Repetition time
- TE:
-
Echo time
- TBI:
-
Traumatic brain injury
- USPIO:
-
Ultrasmall superparamagnetic iron oxide
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Acknowledgements
The S & T project (INM-311, 4.1/1.6) was supported by funding from the Defence Research and Development Organization (DRDO), Ministry of Defence, Govt. of India. The authors also wish to express their gratitude to Dr. Anurag Agrawal and Bijay Ranjan Pattnaik (Research Fellow), Translational research in asthma laboratory, IGIB for their unstinted support in the microscopy study. Dr. Sushanta Kumar Mishra sincerely thanks the Indian Council of Medical Research (ICMR, 2014-25070) for providing a research fellowship in support of the project.
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SKM conceived the study, designed experimental plan, performed experiments, collected and interpreted data and drafted the manuscript. SK and GG supervised all the experimental work, assisted in data interpretation, crosschecked the results and revised the manuscript. AKS took administrative part in providing research funding and permitted to perform experimental work in other labs. All authors read and approved the final draft of manuscript.
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Mishra, S.K., Khushu, S., Singh, A.K. et al. Homing and Tracking of Iron Oxide Labelled Mesenchymal Stem Cells After Infusion in Traumatic Brain Injury Mice: a Longitudinal In Vivo MRI Study. Stem Cell Rev and Rep 14, 888–900 (2018). https://doi.org/10.1007/s12015-018-9828-7
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DOI: https://doi.org/10.1007/s12015-018-9828-7