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The mean peak current density in the ganglionic SMC (n?=?14 cells from five patients) was ?1.67?��?0.24?pA/pF compared to ?1.73?��?0.19?pA/pF in 14 aganglionic SMC taken from the same five patients. There was no significant difference between these groups (P?>?0.05, paired t-test). However, it should be noted that the small number of controls used in this series of experiments (n?=?3) precludes a definitive comparison of http://www.selleckchem.com/products/DMXAA(ASA404).html L-type Ca2+ currents between controls and HD patients. Next, we compared the voltage dependent activation and inactivation properties of the currents in cells isolated from the ganglionic and aganglionic segments from HD patients. Activation curves were constructed from the I�CV relationships by first calculating conductance, G, from: G?=?I/(Vm�CErev), where Vm is the test potential and Erev is the reversal potential for the current. The conductance was then normalized to the maximum value (Gmax) and plotted as G/Gmax against http://www.selleckchem.com/products/Temsirolimus.html the test potential. Summary activation curves are shown in Fig.?2A, where it can be seen that there was no significant difference in the voltage dependence of activation between ganglionic and aganglionic SMC (P? http://en.wikipedia.org/wiki/I%CE%BAB%CE%B1 consisted of holding the cell at ?60?mV and stepping to conditioning potentials ranging from ?100 to +10?mV for 2?s before stepping to a test potential of 0?mV. Mean inactivation data for all cells were well fitted with a Boltzmann function of the form: To confirm that the inward currents described above were in fact L-type Ca2+ current, we examined their sensitivity to the classical L-type Ca2+ channel blocker, nifedipine. Families of currents were evoked from SMC isolated from aganglionic and ganglionic regions and subjected to the I�CV protocol described in Fig.?1, in the absence and presence of nifedipine (1?��mol?L?1). Representative currents evoked from ganglionic SMC before and during addition of nifedipine are shown in Fig.?3A,B, respectively. Summary data from six cells (Fig.?3C) show that nifedipine greatly reduced the current amplitude across the voltage range (P?