Electrostimulation (ES) can be defined as a
safe physical method to induce stem cell differentiation.
The aim of this study is to evaluate
the effectiveness of ES on bone marrow
mesenchymal stem cells (BMSCs) seeded in
collagen scaffolds in terms of proliferation and
differentiation into cardiomyocytes. BMSCs
were isolated from Wistar rats and seeded into
3D collagen type 1 templates measuring 25 x
25 x 6 mm. Bipolar in vitro ES was performed
during 21 days. Electrical impedance and cell
proliferation were measured. Expression of
cardiac markers was assessed by immunocytochemistry.
Viscoelasticity of collagen matrix
was evaluated. Electrical impedance assessments
showed a low resistance of 234±41
Ohms which indicates good electrical conductivity
of collagen matrix. Cell proliferation at
570 nm as significantly increased in ES groups
after seven day (ES 0.129±0.03 vs non-stimulated
control matrix 0.06±0.01, P=0.002) and
after 21 days, (ES 0.22±0.04 vs control
0.13±0.01, P=0.01). Immunocytoche mistry of
BMSCs after 21 days ES showed positive staining
of cardiac markers, troponin I, connexin
43, sarcomeric alpha-actinin, slow myosin,
fast myosin and desmin. Staining for BMSCs
marker CD29 after 21 days was negative.
Electrostimulation of cell-seeded collagen
matrix changed stem cell morphology and biochemical
characteristics, increasing the
expression of cardiac markers. Thus, MSCderived
differentiated cells by electrostimulation
grafted in biological scaffolds might result
in a convenient tissue engineering source for
myocardial diseases.
Electrostimulation, collagen scaffold, stem cells, cell conditioning, myocardial infarct, heart failure, bioartificial myocardium
Juan Carlos Chachques, Georges Pompidou Hospital, Laboratory of Biosurgical Research, 56 rue Leblanc, 75015 Paris, France. Tel: +33.613144398, Fax: +33.156095903 E-mail: j.chachques@egp.aphp.fr
The authors would thank
Yves Lecarpentier and Jean-Louis Hebert
(Bicetre Hospital, Paris, France), Jean-Baptiste
Michel (Inserm, Bichat Hospital, Paris, France)
and Pierre Grandjean (Carpentier Foundation,
Paris, France) for their scientific collaboration.
2012-04-20T00:00:00

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