Mathematical model of pacemaker activity in bursting neurons of snail, Helix pomatia

被引:8
作者
Berezetskaya, NM
Kharkyanen, VN
Kononenko, NI
机构
[1] UKRAINIAN ACAD SCI, INST PHYS, DIV PHYS BIOL SYST, UA-252650 KIEV 22, UKRAINE
[2] AA BOGOMOLETS PHYSIOL INST, NEUROBIOL LAB, UA-252601 KIEV 24, UKRAINE
关键词
D O I
10.1006/jtbi.1996.0214
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
On the basis of experimental data we have developed a mathematical model of pacemaker activity in bursting neurons of snail Helix pomatia which includes a minimal model of membrane potential oscillation, spike-generating mechanism, voltage- and time-dependent inward calcium current, intracellular calcium ions, [Ca2+](in), their fast buffering and accumulation, stationary voltage-dependent [Ca2+](in)-inhibited calcium current. A resulting model of bursting pacemaker activity reproduces all experimental phenomena which were mimicked on the minimal model for membrane potential oscillation including (a) the effect of polarizing current on bursting activity, (b) an increase of input resistance during the depolarizing phase, (c) induced hyperpolarization, etc. This model demonstrates adaptation of bursting activity to both the polarizing current and changes in the stationary sodium or potasium conductances. The model also reproduces the behaviour of the transmembrane ionic current at membrane potentials clamped in different phases of slow-wave development; the calculated current-voltage relationships of the model neuronal membrane using a slow ramp potential clamp demonstrate hysteresis properties. Relationships between the model of bursting activity and the properties of intact bursting neurons are discussed. (C) 1996 Academic Press Limited
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收藏
页码:207 / 218
页数:12
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