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Updated: Jul 17, 2026

Biocytin Recovery and 3D Reconstructions of Filled Hippocampal CA2 Interneurons
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Hippocalcin: a new solution to an old puzzle.

David A Brown1, Barrie Lancaster, Mala M Shah

  • 1Department of Pharmacology, University College London, Gower Street, London, WC1E 6BT, United Kingdom. d.a.brown@ucl.ac.uk

Neuron
|February 14, 2007
PubMed
Summary

Researchers discovered how calcium influx triggers the slow afterhyperpolarization (sAHP) in hippocampal neurons. Calcium binding to hippocalcin is a key step in generating this essential neuronal excitability regulator.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Electrophysiology

Background:

  • The slow afterhyperpolarization (sAHP) in hippocampal pyramidal neurons is crucial for regulating neuronal excitability following action potential bursts.
  • The precise molecular mechanism linking intracellular calcium increase to sAHP generation remained elusive for two decades.

Discussion:

  • This study identifies calcium binding to hippocalcin as a critical step in the cascade leading to sAHP.
  • Hippocalcin, a member of the NCS (neuronal calcium sensor) family, plays a pivotal role in mediating the calcium-dependent potassium current responsible for sAHP.

Key Insights:

  • Calcium binding to hippocalcin is a necessary event for the production of the slow afterhyperpolarization (sAHP).
  • This finding elucidates a long-standing question regarding the molecular underpinnings of sAHP generation in hippocampal neurons.

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Outlook:

  • Further research may explore the role of hippocalcin in other calcium-dependent neuronal processes.
  • Understanding this mechanism could offer new avenues for therapeutic interventions targeting neuronal excitability disorders.