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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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In vitro Labeling of Human Embryonic Stem Cells for Magnetic Resonance Imaging
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Magnetically Labelled iPSC-Derived Extracellular Vesicles Enable MRI/MPI-Guided Regenerative Therapy for Myocardial

Wenshen Wang1,2, Zheng Han1,2,3, Safiya Aafreen1,4

  • 1F.M. Kirby Research Center, Kennedy Krieger Institute, Baltimore, Maryland, USA.

Journal of Extracellular Vesicles
|October 9, 2025
PubMed
Summary

Magnetically labeled stem cell extracellular vesicles (EVs) enable image-guided heart repair. These magneto-iPSC-EVs improve cardiac function and reduce scar size after myocardial infarction, offering a promising cell-free therapy.

Keywords:
MPIMRISPIOextracellular vesiclesiPSC‐EVsmyocardial infarctiontheranostics

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Area of Science:

  • Cardiovascular regenerative medicine
  • Biomaterials science
  • Medical imaging

Background:

  • Stem cell-derived extracellular vesicles (EVs) are a promising cell-free therapy for cardiovascular regeneration.
  • Current limitations include tracking and targeted delivery of EVs in vivo.
  • Developing methods for non-invasive monitoring of EV distribution and therapeutic efficacy is crucial.

Purpose of the Study:

  • To develop magnetically labeled induced pluripotent stem cell-derived EVs (magneto-iPSC-EVs) for image-guided treatment of myocardial infarction.
  • To evaluate the in vitro detectability and in vivo tracking capabilities of magneto-iPSC-EVs using MRI and MPI.
  • To assess the therapeutic efficacy of magneto-iPSC-EVs in a mouse model of myocardial ischemia-reperfusion.

Main Methods:

  • Induced pluripotent stem cell-derived EVs (iPSC-EVs) were isolated and characterized according to MISEV2023 guidelines.
  • Superparamagnetic iron oxide (SPIO) nanoparticles were loaded into iPSC-EVs via electroporation to create magneto-iPSC-EVs.
  • In vitro detectability was assessed using Magnetic Particle Imaging (MPI) and Magnetic Resonance Imaging (MRI).
  • In vivo tracking was performed in a mouse myocardial ischemia-reperfusion model using MPI and ex vivo MRI, followed by Prussian blue staining.

Main Results:

  • Magneto-iPSC-EVs demonstrated sensitive detection by MPI and MRI, with a detectability limit of approximately 10^7 EVs.
  • In vivo MPI successfully tracked intramyocardially injected magneto-iPSC-EVs for 7 days in mice.
  • Both native and magneto-iPSC-EVs significantly improved cardiac function, increasing left ventricular ejection fraction by 37.3% and reducing scar size by 61.0%.

Conclusions:

  • Magneto-iPSC-EVs offer a dual-modality imaging capability (MRI and MPI) for non-invasive monitoring of EV distribution.
  • This cell-free approach demonstrates significant therapeutic benefits for myocardial repair in a preclinical model.
  • Magneto-iPSC-EVs represent a promising strategy for image-guided cardiovascular regenerative medicine.