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Spontaneous Ca2+ transients in developing hippocampal pyramidal cells

M E Dailey1, S J Smith

  • 1Department of Molecular & Cellular Physiology, Stanford University Medical School, California 94305-5426.

Journal of Neurobiology
|March 1, 1994
PubMed
Summary
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This study reveals spontaneous calcium (Ca2+) transients in developing rat hippocampal pyramidal cells. These events are mediated by glutamate acting on ionotropic receptors and are modulated by GABA, suggesting complex early neural network activity.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Cellular Neuroscience

Background:

  • Hippocampal pyramidal cells exhibit complex activity patterns during early development.
  • Understanding the spatiotemporal dynamics of cytosolic calcium (Ca2+) is crucial for elucidating neural network formation.
  • Spontaneous neural activity plays a significant role in shaping developing brain circuits.

Purpose of the Study:

  • To investigate the spatiotemporal patterns of hippocampal pyramidal cell activity during early postnatal development.
  • To characterize the mechanisms underlying spontaneous Ca2+ transients in developing hippocampal slices.
  • To explore the role of neurotransmitters like glutamate and gamma-aminobutyric acid (GABA) in regulating this early activity.

Main Methods:

  • Utilized cytosolic Ca2+ dynamics imaging in early postnatal rat hippocampal tissue slices.

Related Experiment Videos

  • Employed Fluo-3 staining and scanning laser confocal microscopy for high-resolution, time-lapse fluorescence imaging.
  • Applied pharmacological agents including tetrodotoxin, glutamate receptor antagonists (APV, CNQX), and GABAergic agents (picrotoxin, GABA).

    • Main Results:

    • Observed spontaneous Ca2+ transients in the somata and dendrites of pyramidal cells in areas CA1 and CA3.
    • Found that Ca2+ activity in neighboring cells was largely uncorrelated, with occasional synchrony.
    • Demonstrated that these transients were blocked by tetrodotoxin and glutamate receptor antagonists, indicating glutamate-mediated postsynaptic activity.
    • Showed that spontaneous Ca2+ transients were not affected by GABAA receptor blockade but were abolished by GABA application, suggesting GABAB receptor-mediated inhibition.

    Conclusions:

    • Spontaneous Ca2+ transients in developing hippocampal pyramidal cells are driven by glutamate acting on ionotropic receptors.
    • GABA appears to exert an inhibitory influence via GABAB receptors on this early activity.
    • The distinct patterns and mechanisms of spontaneous activity observed may contribute to functional variations across developing central nervous system (CNS) regions.