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Related Experiment Videos

Membrane properties underlying patterns of GABA-dependent action potentials in developing mouse hypothalamic neurons.

Y F Wang1, X B Gao, A N van den Pol

  • 1Department of Neurosurgery, Yale University Medical School, 333 Cedar Street, New Haven, CT 06520-8082, USA.

Journal of Neurophysiology
|September 6, 2001
PubMed
Summary

GABA can trigger action potentials in developing mouse hypothalamus neurons. Multiple spike patterns, an intrinsic property, depend on intracellular chloride levels and sodium currents, not synaptic input.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cellular Electrophysiology

Background:

  • GABAergic signaling is crucial for brain development, influencing neuronal excitability.
  • In early hypothalamic development, GABA can evoke action potentials or shunt excitatory activity.
  • Heterogeneity in GABA-evoked spike patterns and frequency has been observed in developing mouse hypothalamus.

Purpose of the Study:

  • To investigate the mechanisms underlying the patterns and frequency of GABA-evoked spikes in developing mouse hypothalamic neurons.
  • To determine if GABA-evoked multiple spikes are an intrinsic membrane property or dependent on synaptic transmission.
  • To elucidate the ionic basis and developmental regulation of GABA-evoked action potentials.

Main Methods:

  • Whole-cell and gramicidin perforation patch-clamp recordings were performed on 282 neurons in slices and cultures of developing mouse hypothalamus.

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  • GABA was applied to evoke responses, and electrical stimulation of GABAergic neurons was used in slices.
  • Pharmacological agents (bicuculline, CNQX, AP5, tetrodotoxin, Cd2+, Ni2+) and ionic manipulations (intracellular chloride concentration, extracellular calcium) were employed.

    • Main Results:

    • GABA application evoked action potentials with diverse patterns (no spike, single spike, multiple spikes) in developing hypothalamic neurons.
    • Multiple spikes were identified as an intrinsic membrane property, independent of ionotropic glutamate receptors and synaptic transmission.
    • High intracellular chloride concentration and increased sodium current in older neurons (6-9 days in vitro) correlated with the generation of multiple spikes.

    Conclusions:

    • The patterns of multiple action potentials evoked by GABA are an inherent property of developing hypothalamic neurons.
    • Intracellular chloride concentration and sodium channel activity are key determinants of GABA-evoked spiking.
    • GABAergic signaling contributes to neuronal development through intrinsic excitability mechanisms in the hypothalamus.