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Stac Proteins Suppress Ca

Alexander Polster1, Philip J Dittmer2, Stefano Perni1

  • 1Department of Physiology and Biophysics, and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

Stac proteins regulate calcium influx in neurons by interacting with specific calcium channels. This study reveals their role in tuning neuronal calcium signaling, particularly in the developing brain.

Keywords:
Stac proteincalcium-dependent inactivationhippocampusl-type calcium channels

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Ion Channel Physiology

Background:

  • Stac proteins, known for their roles in skeletal muscle, have largely unexplored functions in neurons.
  • Three Stac isoforms (Stac1, Stac2, Stac3) exist, with varying expression levels in brain regions like the cerebellum and forebrain.

Purpose of the Study:

  • To investigate the effects of Stac proteins on neuronal high-voltage-activated calcium channels.
  • To determine if Stac proteins modulate calcium-dependent inactivation (CDI) of different calcium channel types.

Main Methods:

  • Overexpression of Stac isoforms in neonatal rat hippocampal neurons.
  • Heterologous expression of Stac proteins with specific calcium channel subunits (CaV1.2, CaV1.3, CaV2.1) in tsA201 cells.
  • Western blotting to assess Stac2 expression levels in neonatal versus adult brain tissue.

Main Results:

  • Stac protein overexpression eliminated calcium-dependent inactivation (CDI) of l-type calcium currents but not non-l-type currents.
  • All three Stac isoforms suppressed CDI for CaV1.2 and CaV1.3 channels, but not CaV2.1 channels.
  • Stac proteins directly interact with the C terminus of CaV1.2 channels to inhibit CDI, with a specific domain within Stac being sufficient for this effect.
  • Stac2 expression significantly increases in adult forebrain and cerebellum compared to neonates.

Conclusions:

  • Neuronal Stac proteins play a key role in tuning calcium entry through neuronal l-type calcium channels.
  • The postnatal increase in Stac2 suggests a developmental regulation of l-type calcium channel signaling in the brain.
  • Stac proteins are crucial modulators of neuronal excitability and calcium homeostasis.