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J Neurophysiol 85: 620-629, 2001;
0022-3077/01 $5.00
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The Journal of Neurophysiology Vol. 85 No. 2 February 2001, pp. 620-629
Copyright ©2001 by the American Physiological Society

Immature Neocortical Neurons Exist as Extensive Syncitial Networks Linked by Dendrodendritic Electrical Connections

Alejandro Peinado

Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461

Peinado, Alejandro Immature Neocortical Neurons Exist as Extensive Syncitial Networks Linked by Dendrodendritic Electrical Connections. J. Neurophysiol. 85: 620-629, 2001. The properties of immature cortex that may enable it to exhibit large-scale wavelike activity during a brief critical developmental period were investigated by imaging neuronal calcium signals in neonatal cortical slices under conditions of artificially enhanced excitability, conditions that produce a more frequent and robust version of the naturally occurring waves. Using pharmacological manipulation to probe the underlying mechanisms, I show that waves can propagate effectively when excitatory synaptic transmission is blocked. In contrast, propagation is very sensitive to reductions in gap junctional communication. In the barrel field cortex wave propagation is affected by the underlying cytoarchitecture in a way that is consistent with a role for dendrodendritic gap junctions. The ability of cortex to sustain wave activity ends around postnatal day 12, precisely when a major reduction in neuronal gap junctions takes place in cortex. These results suggest that in immature cortex gap junctions link neurons into extensive networks that may allow electrical activity to spread over long distances.




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