ANALYSIS OF A LONG-DURATION HYPERPOLARIZATION PRODUCED BY OCTOPAMINE IN AN IDENTIFIED EFFECTOR NEURON OF HELISOMA

被引:13
作者
BAHLS, FH [1 ]
机构
[1] UNIV WASHINGTON,DEPT PHYSIOL & BIOPHYS,SEATTLE,WA 98195
关键词
Buccal ganglion; Helisoma; Inhibition; Neuromodulation; Octopamine; Potassium;
D O I
10.1016/0304-3940(90)90186-D
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Recent studies have demonstrated that patterned activity in the buccal ganglion of Helisoma trivolvis can be modulated by a variety of neuroactive substances. This study examines the effect of one of these substances, octopamine, on the identified buccal neuron B5. Perfusion of B5 with octopamine produces a 10-20 mV, long-duration hyperpolarization which is associated with an increase in membrane conductance. The magnitude of the hyperpolarization is dose-dependent with a dissociation constant of approximately 5 μM. The reversal potential for the octopamine-induced hyperpolarization (-84 mV) is nearly identical to the predicted potassium equilibrium potential (-85 mV). This result, together with the results of experiments in which extracellular potassium concentrations were altered, demonstrates that octopamine modulated a potassium current in B5. © 1990.
引用
收藏
页码:131 / 133
页数:3
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