Acta Biologica Hungarica
Volume/Issue:
Volume 64: Issue 4
Number and regional distribution of GAD65 mRNA-expressing interneurons in the rat hippocampal formation
Authors:
B. Czéh

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Hajnalka Ábrahám University of Pécs Central Electron Microscopic Laboratory, Faculty of Medicine H-7624 Pécs Hungary

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Siroun Tahtakran University of California Los Angeles Department of Neurobiology and Brain Research Institute Los Angeles CA 90095 USA

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Carolyn Houser

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L. Seress University of Pécs Central Electron Microscopic Laboratory, Faculty of Medicine H-7624 Pécs Hungary

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Pages:
395–413
Online Publication Date:
25 Nov 2013
Publication Date:
01 Dec 2013
Article Category:
Research Article
DOI:
https://doi.org/10.1556/abiol.64.2013.4.1
Keywords:
Cell number; GABA; glutamic acid decarboxylase; hippocampus; stereology
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In rodent models for neuropsychiatric disorders reduced number of hippocampal interneurons have been reported, but the total number of GABAergic neurons in the normal rat hippocampus is yet unknown. We used in situ hybridization method to label the 65 isoform of glutamic acid decarboxylase (GAD65) and counted the number of GAD65 mRNA-expressing neurons along the entire septo-temporal axis of the hippocampus. We found that 2/3 of the interneurons were in Ammon’s horn (61,590) and 1/3 in the dentate gyrus (28,000). We observed the following numbers in Ammon’s horn: CA3 area 33,400, CA2 area 4,190, CA1 area 24,000 and in the dentate gyrus: 6,000 in the molecular and 9,000 in the granule cell layers and 13,000 in the hilus. GAD65 mRNA-expressing neurons were significantly more numerous in dorsal than in ventral hippocampus. The ratio between interneurons and principal cells was lowest in the granule cell layer (0.9%) and highest in hilus (21%). In Ammon’s horn this ratio was constant being 13% in CA3 and 8% in CA1-2 areas. In the entire hippocampal formation, the interneuron/principal cell ratio was 6%, with a significant difference between Ammon’s horn (9.5%) and the dentate gyrus (2.8%) including the hilus. Such low ratios could suggest that even a limited loss of GABAergic neurons in the hippocampus may have a considerable functional impact.

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Cover Acta Biologica Hungarica
Acta Biologica Hungarica
Print ISSN:
0236-5383
Online ISSN:
1588-256X

Senior editors

Editor(s)-in-Chief: Elekes, Károly

Editorial Board

    1. Csányi, Vilmos (Göd)
    1. Dudits, Dénes (Szeged)
    1. Falus, András (Budapest)
    1. Fischer, Ernő (Pécs)
    1. Gábriel, Róbert (Pécs)
    1. Gulya, Károly (Szeged)
    1. Gulyás, Balázs (Stockholm)
    1. Hajós, Ferenc (Budapest)
    1. Hámori, József (Budapest)
    1. Heszky, László (Gödöllő)
    1. Hideg, Éva (Szeged)
    1. E. Ito (Sanuki)
    1. Janda, Tibor (Martonvásár)
    1. Kavanaugh, Michael P. (Missoula)
    1. Kása, Péter (Szeged)
    1. Klein, Éva (Stockholm)
    1. Kovács, János (Budapest)
    1. Brigitte Mauch-Mani (Neuchâtel)
    1. Nässel, Dick R. (Stockholm)
    1. Nemcsók, János (Szeged)
    1. Péczely, Péter (Gödöllő)
    1. Roberts, D. F. (Newcastle-upon-Tyne)
    1. Sakharov, Dimitri A. (Moscow)
    1. Singh, Meharvan (Fort Worth)
    1. Sipiczky, Mátyás (Debrecen)
    1. Szeberényi, József (Pécs)
    1. Székely, György (Debrecen)
    1. Tari, Irma (Szeged)
    1. Vágvölgyi, Csaba (Szeged),
    1. L. Zaborszky (Newark)

 

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Acta Biologica Hungarica
Language English
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Foundation		 1950
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Founder Magyar Tudományos Akadémia
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ISSN 0236-5383 (Print)
ISSN 1588-256X (Online)

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