Linked Life Data

8440773

Source:http://linkedlifedata.com/resource/pubmed/id/8440773

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1993-3-30
pubmed:abstractText
Anatomical and immunohistochemical data indicate that, in addition to pyramidal neurons, nonpyramidal cells are exposed to perisomatic inhibition mediated by gamma-aminobutyric acid (GABA)-containing terminals. However, no direct information is available as yet for the origin of GABAergic inputs to morphologically identified GABAergic neurons. In the present paper, we studied the topographical and synaptic relationship between identified GABAergic large basket cells and their immunohistochemically characterized target neurons revealed by parvalbumin-(PV) and GABA immunostaining in the same material. Extracellularly applied biocytin labelled a total of 36 and 9 large basket cells in layers III and V, respectively. Of these, the axonal arborizations of two basket cells, BC1 and BC2, were reconstructed. The axon of BC1 occupied an area of about 2.3 x 2.2 mm2 in layer III, providing a total of 2,755 terminals. The axon of BC2 showed an overall extent of 3.8 x 1.7 mm2 in layer V elongated in the anteroposterior direction, and gave off 1,599 terminals. Immunostaining for PV was carried out to reveal putative nonpyramidal targets for BC1 and BC2. It was found that in addition to immunonegative cells, they established an average of 4-6 perisomatic contacts onto each of 58 (BC1) and 33 (BC2) PV-immunopositive neurons. For electron microscopic verification, 23 terminals apposing the somata of 12 PV-immunopositive neurons were selected. Each terminal was found to establish symmetrical (type II) contacts with its targeted cell. Furthermore, the distribution of soma area of the targeted PV-immunopositive cells and of identified large basket cells showed remarkable similarity, implying that the two populations were actually the same. In addition, the average horizontal distance between neighbouring PV-immunopositive target cells was found to be about 100 microns both in layers III and V. The results suggest that in area 18 the same large basket cell provides direct inhibition to certain pyramidal cells and facilitation to other pyramidal neurons, by inhibiting their presynaptic large basket cells at regular intervals.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0021-9967
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
327
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
398-415
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Network of GABAergic large basket cells in cat visual cortex (area 18): implication for lateral disinhibition.
pubmed:affiliation
Ruhr-Universität Bochum, Abteilung für Neurophysiologie, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't