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Nanomagnetic Activation as a Way to Control the Efficacy of Nucleic Acid Delivery

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ABSTRACT

Purpose

To explore the potential of magnetofection in delivering pDNA to primary mouse embryonic fibroblasts (PMEFs) and porcine fetal fibroblasts (PFFs) and investigate an effect of magnetic cell labeling on transfection efficacy.

Methods

The formulation and a dose of the magnetic vector were optimized. The efficacy of the procedure was quantified by vector internalization, transgene expression and cell iron loading upon specific labeling with Ab-conjugated magnetic beads or non-specific labeling with MNPs.

Results

Up to sixty percent of PMEF and PFF cells were transfected at low pDNA doses of 4–16 pg pDNA/cell. Specific labeling of the PMEFs with MNPs, resulted in a 3- and 2-fold increase in pDNA internalization upon magnetofection and lipofection, respectively, that yielded a 2–4-fold increase in percent of transgene-expressing cells. Non-specific cell labeling had no effect on the efficacy of the reporter expression, despite the acquisition of similar magnetic moments per cell. In PFFs, specific magnetic labeling of the cell surface receptors inhibited internalization and transfection efficacy.

Conclusions

Magnetic labeling of cell-surface receptors combined with the application of an inhomogenous magnetic field (nanomagnetic activation) can affect the receptor-mediated internalization of delivery vectors and be used to control nucleic acid delivery to cells.

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Abbreviations

CPM:

Counts per minutes

DMEM:

Dulbecco’s modified Eagle’s medium

EDTA:

Ethylenediaminetetraacetic acid

FBS:

Fetal bovine serum

iPSCs:

Induced pluripotent stem cells

MNPs:

Magnetic nanoparticles

PBS:

Dulbecco’s phosphate buffered saline

PCS:

Photon correlation spectroscopy

PE:

Phycoerythrin

PEI:

Polyethylenimine

PFF:

Porcine fetal fibroblasts

PMEF:

Primary mouse embryonic fibroblasts

TEM:

Transmission electron microscopy

TEOS:

Tetraethyl orthosilicate

THPMP:

3-(trihydroxysilyl) propylmethylphosphonate

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ACKNOWLEDGMENTS AND DISCLOSURES

We are thankful to Mikołaj Grzeszkowiak for the work on transmission electron microscopy analysis of the microbeads. We gratefully acknowledge the support from the German Research Foundation through the DFG Research Unit FOR917 (Project PL 281/3-1, TR 408/6-1), from the German Federal Ministry of Education and Research through grants ZIM-KOOP ’STEP-MAG’, and from the Excellence Cluster ‘Nanosystems Initiative Munich’. The work was supported by the International PhD Projects Program of the Foundation for Polish Science operated within the Innovative Economy Operational Program (IE OP) 2007–2013 of the European Regional Development Fund.

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Authors and Affiliations

  1. Institute of Experimental Oncology and Therapy Research, KLinikum rechts der Isar der Technischen Universität München, Ismaninger Str. 22, 81675, Munich, Germany

    Bartosz F. Grześkowiak, Yolanda Sánchez-Antequera, Edelburga Hammerschmid, Christian Plank & Olga Mykhaylyk

  2. The NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowka 85, 61-614, Poznan, Poland

    Bartosz F. Grześkowiak, Anna Woźniak & Ryszard Słomski

  3. Department of Biochemistry and Biotechnology, Poznań University of Life Sciences, ul. Dojazd 11, 60-632, Poznan, Poland

    Bartosz F. Grześkowiak & Ryszard Słomski

  4. Department of Chemistry, Ludwig-Maximilians-Universität München, Munich, 81377, Germany

    Markus Döblinger

  5. Physikalisch-Technische Bundesanstalt Abbestraße 2-12, 10587, Berlin, Germany

    Dietmar Eberbeck

  6. Institute of Experimental Oncology and Therapy Research, Technische Universität München, Ismaninger Str. 22, 81675, Munich, Germany

    Olga Mykhaylyk

Authors
  1. Bartosz F. Grześkowiak
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  2. Yolanda Sánchez-Antequera
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  8. Christian Plank
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  9. Olga Mykhaylyk
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Corresponding author

Correspondence to Olga Mykhaylyk.

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Grześkowiak, B.F., Sánchez-Antequera, Y., Hammerschmid, E. et al. Nanomagnetic Activation as a Way to Control the Efficacy of Nucleic Acid Delivery. Pharm Res 32, 103–121 (2015). https://doi.org/10.1007/s11095-014-1448-6

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  • DOI: https://doi.org/10.1007/s11095-014-1448-6

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