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Distribution of GABA and neuropeptides in the human cerebral cortex

A light and electron microscopic study

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Summary

Antibodies were used to identify neurons in human frontal and temporal cortex that were immunopositive to γ-aminobutyric acid (GABA) and the neuropeptides vasoactive intestinal polypeptide (VIP), substance P (SP) and somatostatin (SOM). Specimens were taken at surgical biopsy and fixed immediately after removal. The results described for both light and electron microscopy were obtained when relatively high concentrations of glutaraldehyde (2.5–3%) were present in the fixative. Specimens were examined from three adults and an infant aged 5 months. GABAergic neurons were present in all cortical layers, with fewest in layers I, deep III and V, and were mainly small, and round or oval. No labelled pyramidal neurons were detected. GABAergic puncta were common in the neuropil, probably representing axonal profiles. VIP-neurons were also found in all layers, including layer I, and were approximately twice as numerous as GABA-cells. SP-positive cells were found throughout the layers, but were sparse in layers I and VI. They were about three times commoner than GABAergic neurons. SOM-reactivity was demonstrated in about the same number of cells as that for SP. Again, this involved all layers, but layer I least. Peptidergic neurons were larger, on the average, than GABAergic cells, and were frequently pyramidal in character. In the infant, the distribution, size and frequency of immunoreactive neurons were similar to those in the adult. However, GABAergic puncta were commoner.

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Authors and Affiliations

  1. Laboratory of Neurobiology, National Institute for Medical Research, NW7 1AA, London, UK

    W. Y. Ong

  2. Department of Anatomy, Charing Cross and Westminster Medical School, W6 8RF, London, UK

    L. J. Garey

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  1. W. Y. Ong
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  2. L. J. Garey
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This paper represents part of a study for the degree of Ph.D. in the National University of Singapore by WYO while at the Department of Anatomy, National University of Singapore.

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Ong, W.Y., Garey, L.J. Distribution of GABA and neuropeptides in the human cerebral cortex. Anat Embryol 183, 397–413 (1991). https://doi.org/10.1007/BF00196841

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