Charge injection based electrical stimulation on polypyrrole planar electrodes to regulate cellular osteogenic differentiation

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

In this study, polypyrrole (Ppy) electrodes were prepared to support an electrical stimulation to MC3T3-E1 cells for regulating their osteogenic differentiation. The charge injection capacity ( C Q ) of the Ppy electrodes could be adjusted by the Ppy thickness, and a higher C Q could make the electrode able to produce a higher charge injection quantity ( Q inj ) at applied voltage. The Q inj onto electrode could be considered as the intensity of the stimulation pulse to cells, and the pulse frequency means the number of electric stimulation with Q inj at one second. Hence, we conducted the present work in the view of Q inj . When the cells were electrically stimulated for 1 hour per day, the electrodes with Q inj ranged in 0.08-0.15 μQ had an obvious role in enhancing cellular osteogenic differentiation whereas Q inj of lower than 0.03 μQ or more than 0.30 μQ gave the stimulations with no or negative effects. And the stimulation with 1 or 25 Hz showed to enhance the differentiation, whereas the stimulation with 50 Hz gave an inhibiting effect. We further found the osteogenic differentiation potential triggered by electrical simulation was related to cell growth stage, and the stimulation carried out at early stage (day 2-5) during 8 days cell culture showed more contribution to enhancing osteogenic differentiation than that at later stage (day 6-8). It is proposed that the desi

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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