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A Possible Link Between HCN Channels and Depression.

Chung Sub Kim1, Daniel Johnston1

  • 1Center for Learning and Memory, University of Texas at Austin, Austin, TX, USA.

Chronic Stress (Thousand Oaks, Calif.)
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Reduced HCN1 channel expression in the dorsal CA1 region may protect against chronic stress-induced depression. This study reveals region-specific changes in hyperpolarization-activated cyclic nucleotide-gated (HCN) channels linked to depression resilience.

Keywords:
HCN1Ihchronic unpredictable stresshippocampusresilience

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Area of Science:

  • Neuroscience
  • Molecular Psychiatry
  • Channelopathies

Background:

  • Growing evidence links hyperpolarization-activated cyclic nucleotide-gated (HCN) channels to depression.
  • The specific role of HCN channel subtypes and their expression patterns in stress-induced depression remains unclear.

Purpose of the Study:

  • To investigate the role of HCN1 channels and their mediated current (Ih) in the dorsal and ventral CA1 regions of the hippocampus during chronic stress.
  • To determine if reduced HCN1 expression confers resilience to chronic unpredictable stress-induced depression.

Main Methods:

  • Analysis of Ih and HCN1 protein expression in dorsal and ventral CA1 regions following acute and chronic stress.
  • Assessment of neuronal excitability in response to Ih changes.
  • Investigating the effects of reducing HCN1 expression on stress resilience.
  • Utilizing in vivo block of sarcoplasmic/endoplasmic reticulum Ca2+-ATPase (SERCA) pumps to model stress-induced changes.

Main Results:

  • Chronic stress, but not acute stress, increased Ih and HCN1 protein expression in the dorsal CA1 region, specifically in the perisomatic region of neurons.
  • This upregulation of Ih reduced neuronal excitability.
  • Reduced HCN1 protein expression in the dorsal CA1 region before stress exposure conferred resilience to chronic unpredictable stress.
  • In vivo SERCA pump inhibition increased intracellular calcium, upregulated Ih, and induced anxiogenic-like behavior.

Conclusions:

  • HCN1 channel function and expression are altered in a region-specific manner within the hippocampus during the development of depression.
  • Reducing HCN1 protein expression in the dorsal CA1 region may be a protective mechanism against chronic stress and depression.