Quantitative analysis of GABAergic neurons in the mouse hippocampus, with optical disector using confocal laser scanning microscope

Shozo Jinno, Yusuke Aika, Takaichi Fukuda, Toshio Kosaka

Research output: Contribution to journalArticle

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Abstract

The numerical densities (NDs) of glutamic acid decarboxylase (GAD) 67 immunoreactive (IR) neurons in the mouse hippocampus were estimated according to the optical disector method using a confocal laser scanning microscope (CLSM), and the cell sizes of disector-counted neurons were measured. Particularly, we focused on the dorsoventral differences of the NDs and cell sizes in individual subdivisions and layers. The NDs of GAD67-IR neurons were larger at the ventral level than at the dorsal level in most subdivisions and layers, except in the stratum pyramidale (SP) of the CA1 region and stratum radiatum (SR) of the CA3 region. In the whole hippocampus, the ND of GAD67- IR neurons was 5.7 ± 0.2 x 103/mm3 at the dorsal level, and 7.3 ± 0.3 x 103/mm3 at the ventral level. The laminar differences showed that the NDs of GAD67-IR neurons in the principal cell layers were generally larger than those in the dendritic layers in each subdivision. The ND of GAD67-IR neurons was largest in the SP of the CA1 region at the dorsal level (13.5 ± 0.9 x 103/mm3), and smallest in the molecular layer (ML) of the dentate gyms (DG) at the dorsal level (1.7 ± 0.2 x 103/mm3). The mean cell sizes of GAD67- IR neurons also showed prominent dorsoventral and laminar differences. In the CA3 region, the mean cell size of GAD67-IR neurons was smaller at the dorsal level than at the ventral level, while in the DG, it was larger at the dorsal level than at the ventral level. On the other hand, the mean cell size of GAD67-IR neurons m the CA1 region showed no significant dorsoventral difference. In the whole hippocampus, the mean cell size of GAD67-IR neurons was slightly smaller at the dorsal level (somatic profile area 149.2 ± 2.5 μ2) than at the ventral level (154.2 ± 2.9 μ2). The laminar differences showed that the mean cell sizes of GAD67-IR neurons in the principal cell layers were generally larger than those in the dendritic layers in each subdivision. The mean cell size of GAD67-IR neurons was largest in the SP of the CA3 region at the ventral level (180.7 ± 8.7 μm2), and smallest in the stratum lacunosum-moleculare (SLM) of the CA3 region at the dorsal level (115.9 ± 7.9 μm2). The cell size distributions in individual layers revealed that GAD67-IR neurons were roughly classified into two subgroups. The composition of these subgroups suggested the heterogeneity of GAD67-IR neurons in the mouse hippocampus in view of cell size.

Original languageEnglish
Pages (from-to)55-70
Number of pages16
JournalBrain Research
Volume814
Issue number1-2
DOIs
Publication statusPublished - Dec 14 1998

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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