Estimated Distribution of Specific Membrane Resistance in Hippocampal Ca1 Pyramidal Neuron.
From: RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. omori@brain.riken.jp
Brain research
- Publish Date: Dec 2006
- ISSN: 0006-8993
- Volume: 1125
- Issue: 1
- Pages: 199-208
- Medium: Print
- Language: English
- Citation (JAMA): Omori Toshiaki, Aonishi Toru, Miyakawa Hiroyoshi, et al. Estimated Distribution of Specific Membrane Resistance in Hippocampal Ca1 Pyramidal Neuron.. Brain Res. Dec 2006;1125:199-208
Abstract
It has been suggested that dendritic membrane properties play an important role in a synaptic integration. In particular, the specific membrane resistance, one of membrane properties, has been reported to be non-uniformly distributed in a single neuron, although the spatial distribution of the specific membrane resistance is still unclear. To reveal its non-uniformity in dendrite, we estimated the spatial distribution of specific membrane resistance in a single neuron, based on voltage imaging data, observed optically in hippocampal CA1 slices. As the optically recorded data, we used bi-directional propagations of subthreshold excitatory postsynaptic potentials in dendrite, which were not be reproduced numerically with uniform-specific membrane resistance. By numerical simulations for multi-compartment models with non-uniformity of specific membrane resistance, we estimated that the distribution obeys a step function; the optically recorded data were consistently reproduced for the distribution with a steep decrease in the specific membrane resistance at the distal apical dendrite, which occurs 300-500 microm away from the soma. In the estimated distribution, the specific membrane resistance at the distal side is less than about 10(3) Omegacm(2), whereas the resistance at the proximal side is greater than about 10(4) Omegacm(2). This result implies that the specific membrane resistance decreases drastically at the distal apical dendrite in hippocampal CA1 pyramidal neuron.
Mesh Headings (Keywords): 2-Amino-5-phosphonovalerate, 6-Cyano-7-nitroquinoxaline-2,3-dione, Animals, Bicuculline, Computer Simulation, Dendrites, Dose-Response Relationship, Radiation, Electric Impedance, Electric Stimulation, Excitatory Amino Acid Antagonists, Excitatory Postsynaptic Potentials, GABA Antagonists, Hippocampus, Membrane Potentials, Models, Neurological, Predictive Value of Tests, Pyramidal Cells, Time Factors
Check for Full Text / PubMed Unique Identifier (PMID): 17113056
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