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Substance P in the ascending cholinergic reticular system.

S R Vincent, K Satoh, D M Armstrong

    Nature
    |December 15, 1983
    PubMed
    Summary

    Researchers found that a specific group of brainstem neurons directly innervates the cerebral cortex. Some of these cholinergic neurons also contain the neuropeptide substance P, indicating peptide-cholinergic coexistence in the brain.

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    Area of Science:

    • Neuroscience
    • Cholinergic Systems
    • Brainstem Anatomy

    Background:

    • The neocortex receives cholinergic input primarily from the basal forebrain.
    • An ascending cholinergic reticular system from the midbrain and pontine tegmentum has been proposed.
    • Previous studies indicated lesions in this region affect forebrain acetylcholine levels and identified ChAT-positive cells.

    Purpose of the Study:

    • To investigate the direct projections of midbrain and pontine tegmental cholinergic neurons to the cerebral cortex.
    • To determine if these ascending cholinergic neurons co-localize with substance P.
    • To establish the presence of peptide-cholinergic coexistence in the central nervous system.

    Main Methods:

    • Combined retrograde tracing with choline acetyltransferase (ChAT) immunohistochemistry.
    • Performed immunohistochemistry for both ChAT and substance P.
    • Utilized cell body counts and projection mapping.

    Main Results:

    • Demonstrated direct innervation of the cerebral cortex by ChAT-positive cell bodies located in the midbrain reticular formation and dorsolateral pontine tegmentum.
    • Identified a subpopulation of these ascending cholinergic neurons that also contain substance P.
    • Confirmed peptide-cholinergic coexistence in ascending reticular neurons.

    Conclusions:

    • The midbrain and pontine tegmentum represent a significant source of cholinergic innervation to the cerebral cortex.
    • Ascending cholinergic neurons in the brainstem can co-express neuropeptides like substance P.
    • This finding extends the understanding of neurotransmitter diversity and co-transmission within the central nervous system.

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