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Brain extracellular space: developmental studies in rat optic nerve.

B R Ransom, W G Carlini, B W Connors

    Annals of the New York Academy of Sciences
    |January 1, 1986
    PubMed
    Summary
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    Brain development involves significant changes in ion concentrations and extracellular space (ECS) volume. Glial cells play a crucial role in regulating these changes, impacting brain homeostasis.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Cellular Physiology

    Background:

    • Neural activity influences ion concentrations (K+, H+) and extracellular space (ECS) dimensions.
    • The developing Retinal Oligodendrocyte Nucleus (RON) exhibits dynamic changes in these parameters during early postnatal life.

    Purpose of the Study:

    • To analyze neural activity-dependent fluctuations in K+, H+, and ECS in the developing RON.
    • To investigate the role of glial cells in the development of ionic and fluid homeostasis within the brain's ECS.

    Main Methods:

    • Analysis of neural activity-dependent fluctuations in K+, H+, and ECS dimensions.
    • Correlation of ECS shrinkage and K+ ceiling level development with glial cell proliferation and maturation.

    Main Results:

    Related Experiment Videos

    • Major changes in K+, H+, and ECS dimensions observed during the first 2-3 postnatal weeks in the developing RON.
    • ECS shrinkage and adult K+ ceiling level emergence correlate with glial cell proliferation and maturation.
    • Activity-dependent pHo shifts show marked alterations with development, potentially linked to carbonic anhydrase activity.

    Conclusions:

    • Glial cells are hypothesized to be critical for ECS shrinkage via electrolyte and water transport.
    • Glial cells likely contribute to the adult K+ ceiling level, though other factors may also be involved.
    • The developing RON serves as a valuable model for studying brain ECS ionic and fluid homeostasis mechanisms.