Abstract：
:The distribution of seven different binding sites for the transmitters L-glutamate (L-glutamate binding sites and N-methyl-D-aspartate receptor), GABA (GABAA receptor), noradrenaline (alpha 1 receptor), acetylcholine (muscarinic M1 and M2 receptors) and serotonin (5-hydroxytryptamine1 receptor) are analysed in the primary visual cortex (area 17) of the common marmoset, Callithrix jacchus, using quantitative autoradiography. All binding sites show a well-defined laminar pattern, which changes sharply at the cytoarchitectonic border to area 18. The quantitative data show that the distribution of different receptors is relatively invariant across the cortical layers. Almost all receptors show a maximum in supragranular layers, low densities in layers IVA/IVB and a second maximum in layer IVC. Statistical analysis of these similarities in laminar distribution patterns of different receptors (co-distribution) reveals, as in other brain regions and species, that L-glutamate binding sites are co-distributed with N-methyl-D-aspartate, GABAA, and muscarinic M1 and M2 receptors. This may reflect the structural basis of a possible interaction between these receptors and their respective transmitters on the level of single cortical layers. Further co-distributions are found between N-methyl-D-aspartate, GABAA and M1, as well as between alpha 1 and M1 and finally between M1 and M2 receptors. Since not all receptors are co-distributed, the similarities in laminar patterns reveal specific aspects of the neurochemical organization of the cortex when receptors of different transmitter systems are analysed in the same brain.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Gebhard R,Zilles K,Schleicher A,Everitt BJ,Robbins TW,Divac Idoi
10.1016/0306-4522(93)90134-2subject
Has Abstractpub_date
1993-10-01 00:00:00pages
877-85issue
4eissn
0306-4522issn
1873-7544pii
0306-4522(93)90134-2journal_volume
56pub_type
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