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Chloride conductances in central neurons.

M Segal, J L Barker, D G Owen

    Israel Journal of Medical Sciences
    |January 1, 1987
    PubMed
    Summary

    Two chloride conductances, gamma-aminobutyric acid (GABA)-activated and calcium-voltage dependent, were studied in central neurons. These conductances regulate neuronal excitability, with GABA-activated currents being faster than calcium-dependent ones.

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    Area of Science:

    • Neuroscience
    • Cellular Electrophysiology

    Background:

    • Central neurons exhibit chloride conductances crucial for regulating neuronal excitability.
    • Gamma-aminobutyric acid (GABA) and calcium (Ca2+) ions play significant roles in neuronal signaling.
    • Understanding these conductances is vital for comprehending neural function and dysfunction.

    Purpose of the Study:

    • To investigate the characteristics of GABA-activated and Ca2+-voltage dependent chloride conductances in cultured central neurons.
    • To elucidate the kinetic properties and voltage-dependence of these chloride conductances.
    • To determine the role of these conductances in modulating neuronal excitability.

    Main Methods:

    • Utilized tissue-cultured central neurons, including hippocampal, hypothalamic, and spinal cord neurons.
    • Employed voltage-clamp techniques to record inhibitory postsynaptic currents (IPSCs) and tail currents.
    • Investigated the effects of drugs and ion concentrations on chloride conductances.

    Main Results:

    • GABA-activated chloride currents exhibit rapid kinetics (3-5 ms rise, 15-20 ms decay) and are voltage-dependent.
    • Ca2+-voltage dependent chloride conductance, observed when K+ conductances are blocked, follows Ca2+ spikes and is sensitive to Ca2+ antagonists.
    • Analysis of tail currents revealed slow (200 ms) passive decay, reversing as a function of chloride equilibrium potential ([E]Cl).

    Conclusions:

    • Chloride conductances, both GABA-activated and Ca2+-voltage dependent, play a significant role in suppressing neuronal excitability.
    • The kinetics of inhibitory postsynaptic currents are primarily determined by the GABA-activated chloride channel.
    • Further research is needed to understand the in vivo pharmacological and physiological properties of these chloride conductances.

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