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Changes in peripheral HCN2 channels during persistent inflammation.

L-A R Jansen1, L A Forster1,2, X L Smith1

  • 1Department of Biology, Georgia State University , Atlanta, Georgia.

Channels (Austin, Tex.)
|January 11, 2021
PubMed
Summary
This summary is machine-generated.

Chronic pain involves nociceptor sensitization, partly due to changes in the hyperpolarization-activated current (Ih). This study found transient, bilateral increases in Hyperpolarization-activated Cyclic Nucleotide-gated ion channel 2 (HCN2) expression and SUMOylation in rat DRG following inflammation.

Keywords:
CFADRGHCN2SUMOinflammation

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Area of Science:

  • Neuroscience
  • Pain Research
  • Molecular Biology

Background:

  • Nociceptor sensitization, a key factor in chronic pain, is linked to increased hyperpolarization-activated current (Ih).
  • The Hyperpolarization-activated Cyclic Nucleotide-gated ion channel 2 (HCN2) is implicated in Ih-dependent pain hypersensitivity.
  • Limited understanding exists regarding HCN2 regulation during chronic inflammatory pain.

Purpose of the Study:

  • To investigate changes in HCN2 expression and SUMOylation in dorsal root ganglia (DRG) during Complete Freund's Adjuvant (CFA)-induced inflammatory pain.
  • To examine the temporal and spatial dynamics of HCN2 modifications in L4 and L6 DRG following CFA injection.

Main Methods:

  • Intra-plantar CFA injection in rats to induce unilateral hindpaw hyperalgesia.
  • Analysis of HCN2 expression using immunohistochemistry on L4 and L6 DRG cryosections.
  • Measurement of HCN2 SUMOylation via proximity ligation assays in L4 and L6 DRG cryosections at days 1 and 3 post-CFA.

Main Results:

  • CFA injection caused a transient, bilateral increase in HCN2 expression in L4 and L6 DRG at day 1, which subsided by day 3.
  • Enhanced HCN2 SUMOylation was observed in the ipsilateral L6 DRG at both day 1 and day 3 post-CFA.
  • These modifications in HCN2 expression and SUMOylation were transient, suggesting dynamic regulation during inflammation.

Conclusions:

  • HCN2 expression and SUMOylation are dynamically regulated in DRG neurons during CFA-induced inflammatory pain.
  • These transient changes in HCN2 suggest its involvement in the development and maintenance of inflammatory pain.
  • The findings highlight multiple regulatory mechanisms acting on HCN2 in the context of chronic pain.