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• W2148423003 abstract "The role of potassium conductances in determining input resistance was studied in 166 genioglossal (GG) motoneurons using sharp electrode recording in brain stem slices of the rats aged 5-7 days, 13-15 days, and 19-24 days postnatal (P). A high magnesium (Mg(2+); 6 mM) perfusate was used to block calcium-mediated synaptic release while intracellular or extracellular cesium (Cs(+)) and/or extracellular tetraethylammonium (TEA) or barium (Ba(2+)) were used to block potassium conductances. In all cases, the addition of TEA to the high Mg(2+) perfusate generated a larger increase in both input resistance (R(n)) and the first membrane time constant (tau(0)) than did high Mg(2+) alone indicating a substantial nonsynaptic contribution to input resistance. With intracellular injection of Cs(+), GG motoneurons with lower resistance (<40 MOmega), on the average, showed a larger percent increase in R(n) than cells with higher resistance (>40 MOmega). There was also a significant increase in the effect of internal Cs(+) on R(n) and tau(0) with age. The largest percent increase (67%) in the tau(0) due to intracellular Cs(+) occurred at P13-15, a developmental stage characterized by a large reduction in specific membrane resistance. Addition of external Cs(+) blocked conductances (further increasing R(n) and tau(0)) beyond those blocked by the TEA perfusate. Substitution of external calcium with 2 mM barium chloride produced a significant increase in both R(n) and tau(0) at all ages studied. The addition of either intracellular Cs(+) or extracellular Ba(2+) created a depolarization shift of the membrane potential. The amount of injected current required to maintain the membrane potential was negatively correlated with the control R(n) of the cell at most ages. Thus low resistance cells had, on the average, more Cs(+)- and Ba(2+)-sensitive channels than their high resistance counterparts. There was also a disproportionately larger percent increase in tau(0) as compared with R(n) for both internal Cs(+) and external Ba(2+). Based on a model by Redman and colleagues, it might be suggested that the majority of these potassium conductances underlying membrane resistance are initially located in the distal dendrites but become more uniformly distributed over the motoneuron surface in the oldest animals." @default.
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• W2148423003 date "2000-11-01" @default.
• W2148423003 modified "2023-10-17" @default.
• W2148423003 title "Role of Potassium Conductances in Determining Input Resistance of Developing Brain Stem Motoneurons" @default.
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• W2148423003 doi "https://doi.org/10.1152/jn.2000.84.5.2330" @default.
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