Hybrid magnetic scaffolds: The role of scaffolds charge on the cell proliferation and Ca2+ ions permeation

[Display omitted] •Negatively charged scaffolds and magnetic particles favored cell proliferation.•The permeation of Ca2+ ions through the magnetic charged scaffolds was the fastest.•The magnetic particles stimulated mechanical vibrations in the charged scaffolds.•Mechanical vibrations favored the C...

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Bibliographic Details
Published in:Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2017-08, Vol.156, p.388-396
Main Authors: Castro, Pollyana S., Bertotti, Mauro, Naves, Alliny F., Catalani, Luiz Henrique, Cornejo, Daniel R., Bloisi, Georgia D., Petri, Denise F.S.
Format: Article
Language:English
Subjects:
Ca2+ ions permeation
Cell adhesion
Cell proliferation
HPMC
Magnetic scaffolds
Xanthan
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Summary:[Display omitted] •Negatively charged scaffolds and magnetic particles favored cell proliferation.•The permeation of Ca2+ ions through the magnetic charged scaffolds was the fastest.•The magnetic particles stimulated mechanical vibrations in the charged scaffolds.•Mechanical vibrations favored the Ca2+ ions permeation through the scaffolds.•Mechanical vibrations might open the cell membranes mechano-sensitive ion channels. Magnetic scaffolds with different charge densities were prepared using magnetic nanoparticles (MNP) and xanthan gum (XG), a negatively charged polysaccharide, or hydroxypropyl methylcellulose (HPMC), an uncharged cellulose ether. XG chains were crosslinked with citric acid (cit), a triprotic acid, whereas HPMC chains were crosslinked either with cit or with oxalic acid (oxa), a diprotic acid. The scaffolds XG-cit, HPMC-cit and HPMC-oxa were characterized by scanning electron microscopy (SEM), inductively coupled plasma atomic emission spectroscopy (ICP-AES), superconducting quantum interference device (SQUID) magnetometry, contact angle and zeta-potential measurements. In addition, the flux of Ca2+ ions through the scaffolds was monitored by using a potentiometric microsensor. The adhesion and proliferation of murine fibroblasts (NIH/3T3) on XG-cit, XG-cit-MNP, HPMC-cit, HPMC-cit-MNP, HPMC-oxa and HPMC-oxa-MNP were evaluated by MTT assay. The magnetic scaffolds presented low coercivity (XG-cit>HPMC-cit, HPMC-cit-MNP, HPMC-oxa, HPMC-oxa-MNP. A model was proposed to explain the cell behavior stimulated by the scaffold charge, MNP and Ca2+ ions permeation.
ISSN:0927-7765
1873-4367
DOI:10.1016/j.colsurfb.2017.05.046