Afferent innervation influences HVA Ca2+current expression in cultured neocortical neurones
作者:
Markus Werner,
Hanns Hatt,
Kurt Gottmann,
期刊:
NeuroReport
(OVID Available online 1998)
卷期:
Volume 9,
issue 6
页码: 1255-1260
ISSN:0959-4965
年代: 1998
出版商: OVID
关键词: Afferent innervation;Ca2+currents;Cell culture;Neocortical neurones;Patch-clamp;Synaptic activity
数据来源: OVID
摘要:
VOLTAGE-ACTIVATED Ca2+channels represent a major pathway of Ca2+entry into neurones. The regulation of the expression of functional Ca2+channels thus plays a central role in neuronal differentiation. To study the influence of afferent innervation on Ca2+current expression, we compared HVA Ca2+currents in two categories of cultured neocortical neurones that showed pronounced differences in synaptic innervation density. Neurones strongly innervated by a presynaptic explant had a two-fold greater HVA Ca2+current density than neurones not innervated by explant fibres. Chronic blockade of synaptic activity did not affect HVA Ca2+current density in innervated neurones. Our results thus suggest an activity-independent regulation of HVA Ca2+current expression by afferent innervation.
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