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Related Experiment Videos

Acetylcholine synthesis by displaced amacrine cells

S A Hayden, J W Mills, R M Masland

    Science (New York, N.Y.)
    |October 1, 1980
    PubMed
    Summary

    Researchers identified acetylcholine-synthesizing neurons in the rabbit retina. These neurons are not ganglion cells but appear to be displaced amacrine cells, unaffected by optic nerve damage.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Cell Biology

    Background:

    • The rabbit retina's ganglion cell layer contains neurons.
    • Acetylcholine is synthesized by neurons in this layer.
    • Identifying specific acetylcholine-synthesizing neurons is crucial for understanding retinal circuitry.

    Purpose of the Study:

    • To identify the specific cell types in the rabbit retina that synthesize acetylcholine.
    • To determine if acetylcholine-synthesizing neurons are ganglion cells or another cell type.

    Main Methods:

    • Retrograde transport of fluorescent dye to label ganglion cells.
    • Exposure to tritiated choline to label acetylcholine-synthesizing cells.
    • Autoradiography combined with fluorescence microscopy.
    • Optic nerve sectioning to induce ganglion cell degeneration.

    Main Results:

    • Fluorescent dye and tritiated acetylcholine were found in distinct cell populations.
    • Optic nerve sectioning did not alter overall acetylcholine synthesis rate or the number of acetylcholine-containing cells.
    • Acetylcholine synthesis was localized to cells that were not retrogradely labeled as ganglion cells.

    Conclusions:

    • The neurons synthesizing acetylcholine in the rabbit retina are not ganglion cells.
    • These acetylcholine-synthesizing neurons are likely displaced amacrine cells.
    • Amacrine cells play a significant role in retinal acetylcholine synthesis.

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