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The Journal of Neuroscience, March 24, 2004, 24(12):2853-2865; doi:10.1523/JNEUROSCI.4814-03.2004
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Behavioral/Systems/Cognitive
Axon Branching and Synaptic Bouton Phenotypes in GABAergic Nonpyramidal Cell Subtypes
Fuyuki Karube, Yoshiyuki Kubota, andYasuo Kawaguchi Division of Cerebral Circuitry, National Institute for Physiological Sciences, Okazaki 444-8585, Japan
GABAergic nonpyramidal cells, cortical interneurons, consist of heterogeneous subtypes differing in their axonal field and target selectivity. It remains to be investigated how the diverse innervation patterns are generated and how these spatially complicated, but synaptically specific wirings are achieved. Here, we asked whether a particular cell type obeys a specific branching and bouton arrangement principle or differs from others only in average morphometric values of the morphological template common to nonpyramidal cells. For this purpose, we subclassified nonpyramidal cells within each physiological class by quantitative parameters of somata, dendrites, and axons and characterized axon branching and bouton distribution patterns quantitatively. Each subtype showed a characteristic set of vertical and horizontal bouton spreads around the somata. Each parameter, such as branching angles, internode or interbouton intervals, followed its own characteristic distribution pattern irrespective of subtypes, suggesting that nonpyramidal cells have the common mechanism for formation of the axon branching pattern and bouton arrangement. Fitting of internode and interbouton interval distributions to the exponential indicated their apparent random occurrence. Decay constants of the fitted exponentials varied among nonpyramidal cells, but each subtype expressed a particular set of interbouton and internode interval averages. The distinctive combination of innervation field shape and local axon phenotypes suggests a marked functional difference in the laminar and columnar integration properties of different GABAergic subtypes, as well as the subtype-specific density of inhibited targets.
Key words: frontal cortex; interneuron; GABA; synaptic bouton; fast-spiking cell; late-spiking cell
Received Aug 19, 2003; revised February 2, 2004; accepted February 3, 2004.
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