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Characteristics of norepinephrine uptake in developing peripheral nerve terminals

D W Hoffman, E Giacobini

    Brain Research
    |November 10, 1980
    PubMed
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    The development of [3H]norepinephrine uptake in chick irises shows distinct timelines for various characteristics. Sodium-dependent uptake is a more reliable indicator of innervation development than temperature-dependent uptake.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Pharmacology

    Background:

    • Neuronal development involves complex changes in neurotransmitter uptake mechanisms.
    • Understanding the ontogeny of norepinephrine (NE) transport is crucial for studying neural circuit formation.

    Purpose of the Study:

    • To characterize the developmental profile of [3H]norepinephrine uptake in the chick iris.
    • To investigate the emergence and maturation of different NE uptake characteristics, including Na+-dependence, temperature sensitivity, and sensitivity to inhibitors.

    Main Methods:

    • Measurement of [3H]norepinephrine uptake in chick irises at various developmental stages (incubation and post-hatching).
    • Assessment of Na+-dependence, ouabain sensitivity, temperature sensitivity, and inhibition by desmethylimipramine (DMI), cocaine, and metanephrine.

    Related Experiment Videos

  • Determination of kinetic parameters (Km and Vmax) of NE uptake.

    • Main Results:

    • Na+-dependence and ouabain sensitivity appeared at 10 days of incubation (d.i.), with Na+-dependence peaking at 14 d.i.
    • Temperature sensitivity emerged at hatching, while inhibition by DMI and cocaine developed at 10 d.i.
    • Km values showed a biphasic pattern, and Vmax increased significantly between 10 and 14 d.i., correlating with sympathetic innervation growth.

    Conclusions:

    • Different characteristics of NE uptake mature at distinct developmental stages in the chick iris.
    • Na+-dependent uptake is a more consistent index of innervation development compared to temperature-dependent uptake.
    • Longitudinal studies require characterization of transport processes at each developmental stage due to unique profiles of sensitivity.