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Membrane contact regulates transmitter phenotypic expression.

J E Adler, I B Black

    Brain Research
    |December 1, 1986
    PubMed
    Summary
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    Cell contact in high-density cultures increases substance P (SP) and choline acetyltransferase (ChAT) expression. Membrane interactions appear to regulate this neuronal phenotypic plasticity.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Developmental Biology

    Background:

    • Neuronal cultures at high densities show increased expression of substance P (SP) and choline acetyltransferase (ChAT).
    • Cell aggregation is observed concurrently with increased transmitter expression, suggesting a role for cell contact.

    Purpose of the Study:

    • To investigate the specific role of cell contact in regulating selective transmitter expression in neonatal sympathetic neurons.
    • To determine if cell membrane interactions mediate the observed increases in SP and ChAT.

    Main Methods:

    • Culturing neonatal sympathetic neurons at varying densities.
    • Interfering with cell aggregation using methylcellulose or tunicamycin.
    • Adding neonatal rat tissue-derived membranes to neuronal cultures.

    Related Experiment Videos

    Main Results:

    • High neuronal density and aggregation significantly increased SP content and ChAT activity.
    • Inhibiting aggregation reduced SP and ChAT increases without affecting neuronal survival.
    • Added membranes, particularly from dorsal root ganglia and SCG, stimulated ChAT activity and SP content, even in low-density cultures.

    Conclusions:

    • Cell contact is a critical mediator for ChAT expression and SP rise in high-density neuronal cultures.
    • Interactions between cell membrane components regulate phenotypic expression in aggregating neurons.
    • This suggests a mechanism for activity-dependent neuronal differentiation and plasticity.