Laminar distribution of cholinergic markers in neocortex: Effects of lesions

Michael V Johnston, A. C. Young, J. T. Coyle

Research output: Contribution to journalArticle

Abstract

The distribution of presynaptic markers for cholinergic and GABAergic neurons in the various layers of the lateral neocortex was determined with a technique in which sections of increasing depth horizontal to the pial surface were obtained on a frozen-stage microtome and analyzed for the markers. The specific activities of choline acetyltransferase and acetylcholineasterase had an uneven distribution in the cortex with lowest levels of activity associated with lamina II and III, whereas glutamate decarboxylase activity was highest in lamina II, III, and IV. Fetally-induced hypoplasia of the cortex resulted in an enrichment in both choline acetyltransferase and acetylcholinesterase activity in all layers with no significant change in the activity of glutamate decarboxylase. Lesion of the nucleus basalis-cortical cholinergic pathway resulted in marked reductions in the activities of acetylcholinesterase and choline acetyltransferase in all cortical layers and an elimination of the uneven distribution of these markers within the cortex. These results provide further evidence that acetylcholinesterase activity is specifically associated with cortical cholinergic afferents and support the existence of cortical intrinsic cholinergic neurons.

Original languageEnglish (US)
Pages (from-to)597-607
Number of pages11
JournalJournal of Neuroscience Research
Volume6
Issue number5
StatePublished - 1981

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Choline O-Acetyltransferase
Neocortex
Acetylcholinesterase
Substantia Gelatinosa
Cholinergic Agents
Cholinergic Neurons
Glutamate Decarboxylase
GABAergic Neurons
Spinal Cord Dorsal Horn

ASJC Scopus subject areas

  • Neuroscience(all)

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Laminar distribution of cholinergic markers in neocortex : Effects of lesions. / Johnston, Michael V; Young, A. C.; Coyle, J. T.

In: Journal of Neuroscience Research, Vol. 6, No. 5, 1981, p. 597-607.

Research output: Contribution to journalArticle

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