Local gene targeting and cell positioning using magnetic nanoparticles and magnetic tips: Comparison of mathematical simulations with experiments

Carsten Kilgus, Alexandra Heidsieck, Annika Ottersbach, Wilhelm Roell, Christina Trueck, Bernd K. Fleischmann, Bernhard Gleich, Philipp Sasse

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Purpose: Magnetic nanoparticles (MNPs) and magnets can be used to enhance gene transfer or cell attachment but gene or cell delivery to confined areas has not been addressed. We therefore searched for an optimal method to simulate and perform local gene targeting and cell delivery in vitro. Methods: Localized gene transfer or cell positioning was achieved using permanent magnets with newly designed soft iron tips and MNP/lentivirus complexes or MNP-loaded cells, respectively. Their distribution was simulated with a mathematical model calculating magnetic flux density gradients and particle trajectories. Results: Soft iron tips generated strong confined magnetic fields and could be reliably used for local (∼500 μm diameter) gene targeting and positioning of bone marrow cells or cardiomyocytes. The calculated distribution of MNP/lentivirus complexes and MNP-loaded cells concurred very well with the experimental results of local gene expression and cell attachment, respectively. Conclusion: MNP-based gene targeting and cell positioning can be reliably performed in vitro using magnetic soft iron tips, and computer simulations are effective methods to predict and optimize experimental results.

Original languageEnglish
Pages (from-to)1380-1391
Number of pages12
JournalPharmaceutical Research
Volume29
Issue number5
DOIs
StatePublished - May 2012

Keywords

  • Cell positioning
  • Gene targeting
  • Localization
  • Magnetic nanoparticles
  • Mathematical simulation

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