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Related Experiment Video

Updated: Jun 25, 2026

Tracking Superparamagnetic Iron Oxide-labeled Mesenchymal Stem Cells using MRI after Intranasal Delivery in a Traumatic Brain Injury Murine Model
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Labeling of human mesenchymal stromal cells with superparamagnetic iron oxide leads to a decrease in migration

Richard Schäfer1, Rainer Kehlbach, Michaela Müller

  • 1Institute of Clinical and Experimental Transfusion Medicine, University Hospital Tübingen, Germany.

Cytotherapy
|February 5, 2009
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Summary

Small particle iron oxide (SPIO) labeling of human mesenchymal stem cells (hMSCs) with or without transfection agents (TA) reduced their migration and colony formation. These functional effects were observed even after cells were cultured for two passages post-labeling.

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Area of Science:

  • Stem cell biology
  • Biomedical engineering
  • Cellular imaging

Background:

  • Cellular labeling is essential for tracking stem cells post-transplantation.
  • Clinically approved small particles of iron oxide (SPIO) are used for cell labeling.
  • Transfection agents (TA) can enhance SPIO uptake but may affect cell function.

Purpose of the Study:

  • To investigate the impact of SPIO labeling, with or without TA, on human mesenchymal stem cell (MSC) function.
  • To assess effects on cell viability, differentiation, migration, and colony-forming ability.

Main Methods:

  • Human bone marrow-derived MSCs were labeled with SPIO alone or with SPIO and TA.
  • Functional assays including migration, colony formation, and differentiation were performed immediately and after two passages.
  • Cellular total iron load (TIL), viability, and ultrastructure via electron microscopy were quantified.

Main Results:

  • SPIO labeling did not significantly alter MSC viability or differentiation potential.
  • Labeling with TA initially caused surface coating, with internalization after two passages.
  • A significant decrease in migration capacity and colony-forming ability was observed post-labeling, persisting after two passages.

Conclusions:

  • SPIO labeling, with or without TA, negatively impacts MSC migration and colony formation.
  • These functional deficits are not directly linked to total iron load or particle localization.
  • SPIO labeling represents a functional modification of human mesenchymal stem cells.