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Steady DC voltage has been applied in many previous studies for electrical stimulation, mainly due to the existence of DC electrical http://www.selleckchem.com/products/PLX-4032.html gradients of voltage within tissues (endogenous electrical fields) (Mccaig et al., 2005). Wood et al. (2006) investigated the influence of brief DC electric stimulation on neurite outgrowth and outgrowth rates after application. Their results showed that the presence of a 25 V/m electrical field for 10 min increased overall neurite outgrowth over controls for up to 48 h after stimulation. In the literature, both electrical field and current have been reported to be effective in modulating cell behaviour. There are a few reports indicating more effectiveness of DC electrical fields than DC currents in electrical stimulation. Shi et al. (2007) applied both electrical field (100 mV/mm) and current (2.5�C250 ?A/mm) for electrical stimulation and concluded that a wide range of surface current density (2.5�C250 ?A/mm) had no significant effect on cell adhesion or cell viability, while a constant electrical field of 100 mV/mm upregulated the mitochondrial activity of human cutaneous fibroblasts and enhanced their adhesion. Their results showed that electrical field plays a more substantial role than electrical current in modulating the activity of cells cultured on conductive polymeric http://www.selleck.cn/products/BEZ235.html scaffolds compared to the non-stimulated cell cultures. However, these researchers did not rule out the importance of current as potential gradient reaches a certain critical level. Some studies also showed that, on exposure to an electrical field ( http://www.selleckchem.com/products/AZD2281(Olaparib).html mechanism is not very clear but the asymmetric redistribution of charged cell surface receptors might be effective (Zhao et al., 1996). Electrical field plays an important role in certain processes that regulate the axis of cell division, and in the presence of electrical field cell divisions occurred in vivo (Zhao et al., 1999). However, electrical stimulation in the form of a pulsed electromagnetic field has also been applied in tissue engineering as well as in clinical settings, as an alternative treatment to promote wound healing, reduce chronic pain and headaches, to treat diseases such as Parkinson's disease and to enhance nerve regeneration (Shi et al., 2008). In vivo studies carried out by Sisken et al. (1989) showed that stimulation of rat sciatic nerves with pulsed electromagnetic fields (PEMFs) for as short a time as 1 h/day for 3 days increased nerve regeneration rates. Various conditions have been described in the literature for electrical stimulation for tissue engineering applications. Table 1 gives a summary of various conditions of electrical stimulation which have been applied by various researchers.