Journal
BIOMATERIALS
Volume 29, Issue 34, Pages 4510-4520Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2008.07.052
Keywords
Smooth muscle cell; Electrical stimulation; Electroactive polymer; Cell activation; Cell proliferation
Funding
- Australian Research Council
- The University of Queensland
- Australian Institute for Bioengineering and Nanotechnology
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Vascular smooth muscle cells (VSMCs) isolated from rabbit aorta and immortalised A7r5 cells were cultured on conducting polypyrrole (PPy) substrates and were subjected to a 50 mu A sinusoidal electrical stimulation at 0.05, 5 and 500 Hz. These substrates were doped with hyaluronic acid and coated with collagen IV followed by Matrigel (R) in order to mimic the basement membrane and encourage cell attachment. Increased proliferation and expression of smooth muscle phenotype markers (smooth muscle alpha-actin and smooth muscle myosin heavy chain) were observed in cultures stimulated at 5 and 500 Hz. This increased proliferation and expression of contractile proteins were found to be significantly decreased when L-type voltage-gated calcium channels (VGCC) were blocked with the drug nifedipine. To the best of our knowledge, this is the first work that demonstrates that VSMCs cultured on a conducting polymer substrate and subject to electrical stimulation not only exhibit enhanced proliferation but can be simultaneously encouraged to increase contractile protein expression. This behaviour is somewhat contrary to the classical definition of smooth muscle contractile and synthetic phenotypes that, in general, requires a modulation in phenotype as a prerequisite for smooth muscle proliferation. This interesting result highlights both the inherent plasticity of vascular smooth muscle cells and the potential of electrical stimulation via conducting polymer substrates to manipulate their behaviour. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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