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Related Experiment Videos

Peptides influence retinal ganglion cells.

E Dick, R F Miller

    Neuroscience Letters
    |October 23, 1981
    PubMed
    Summary

    Neurotransmitters like neurotensin and substance P excite amphibian retinal ganglion cells, while enkephalinamide suppresses them, suggesting peptides play a role in the vertebrate retina.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Pharmacology

    Background:

    • The vertebrate retina utilizes various signaling molecules to process visual information.
    • Peptides are known neuromodulators in the central nervous system, but their specific roles in retinal circuitry are not fully elucidated.

    Purpose of the Study:

    • To investigate the functional effects of specific neuropeptides on amphibian retinal ganglion cells.
    • To determine if neurotensin, substance P, and (D-Ala2, Met5)-enkephalinamide modulate the activity of retinal ganglion cells.

    Main Methods:

    • Iontophoresis was used to deliver neurotensin, substance P, and (D-Ala2, Met5)-enkephalinamide directly onto amphibian retinal ganglion cells.
    • The electrical activity of the ganglion cells was recorded to assess the effects of the applied peptides.

    Main Results:

    • Substance P and neurotensin demonstrated excitatory effects on retinal ganglion cells.
    • (D-Ala2, Met5)-enkephalinamide exhibited inhibitory effects, suppressing the activity of all tested ganglion cell types.

    Conclusions:

    • The findings support a functional role for peptides in modulating neuronal activity within the vertebrate retina.
    • These peptides may contribute to the complex processing of visual signals in the retina.

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