Objective To test the expression and possible role of ether-a-go-go-related gene(erg) protein K~+ channels in gastrointestinal tract of CD1 mice. Methods The expression of erg mRNA in the gastrointestinal tract of CD1 mice were tested by RT-PCR.Extracellular voltage recordings was used to compare the slow-wave activity of colon in the absence or presence of E-4031(1μM,30min). Results RT-PCR showed the presence of ERG mRNA in the gastrointestinal tract of CD 1 mice.E-4031 markedly increased tissue excitabili...