Document Detail

Neuronal gap junctions in the rat main olfactory bulb, with special reference to intraglomerular gap junctions.
MedLine Citation:
PMID:  12573466     Owner:  NLM     Status:  MEDLINE    
The structural features of neuronal gap junction-forming processes in the rat olfactory bulb were analyzed electron microscopically. Gap junctions were present in glomeruli and extraglomerular regions. In extraglomerular regions, mitral/tufted cell somata, dendrites and axon hillock-initial segments made gap junctions and mixed synapses with interneuronal processes, some of which were confirmed to be GABA positive. In glomeruli gap junctions were encountered mainly between mitral/tufted cell dendrites and diverse types of processes; a small population of them were conclusively identified as periglomerular cell dendrites. Gap junction-forming processes frequently received synapses from olfactory nerve terminals, suggesting that they could be type 1 periglomerular cells. However, the majority were GABA negative or only faintly positive and none were tyrosine hydroxylase positive, indicating that they were different from previously reported type 1 periglomerular cells. Furthermore serial sectioning analyses revealed that the majority of those processes forming gap junctions with mitral/tufted dendrites were smooth cylindrical and had few presynaptic sites, indicating that they were different from previously described periglomerular cells. These findings revealed that mitral/tufted cells make gap junctions with diverse types of neurons; and some of these gap junction-forming processes originated from some types of periglomerular cells but others from hitherto uncharacterized neuron type(s).
Toshio Kosaka; Katsuko Kosaka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroscience research     Volume:  45     ISSN:  0168-0102     ISO Abbreviation:  Neurosci. Res.     Publication Date:  2003 Feb 
Date Detail:
Created Date:  2003-02-07     Completed Date:  2003-04-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8500749     Medline TA:  Neurosci Res     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  189-209     Citation Subset:  IM    
Department of Anatomy and Neurobiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
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MeSH Terms
Gap Junctions / chemistry,  ultrastructure*
Neurons / chemistry,  ultrastructure*
Olfactory Bulb / chemistry,  ultrastructure*
Rats, Wistar
gamma-Aminobutyric Acid / analysis
Reg. No./Substance:
56-12-2/gamma-Aminobutyric Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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