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Related Experiment Video

Updated: Mar 31, 2026

Mechanical Conflict-Avoidance Assay to Measure Pain Behavior in Mice
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CaMKII Controls Whether Touch Is Painful.

Hongwei Yu1, Bin Pan1, Andy Weyer2

  • 1Department of Anesthesiology and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 23, 2015
PubMed
Summary
This summary is machine-generated.

Calcium-dependent kinase II (CaMKII) in touch neurons normally adapts sensitivity. Loss of CaMKII function due to sensory deprivation shifts touch into a pain pathway, causing pain from light touch.

Keywords:
CaMKIIDRGadaptationmechanosensationpainsensory neuron

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Molecular Mechanisms of Plasticity

Background:

  • Touch sensation relies on low-threshold mechanoreceptors (LTMRs).
  • Neuronal plasticity, like adaptation, modulates sensory input.
  • CaMKII is a key enzyme in activity-dependent plasticity, reflecting neuronal firing history.

Purpose of the Study:

  • Investigate the role of CaMKII in LTMR function and sensory adaptation.
  • Determine if CaMKII activity in LTMRs is essential for normal touch processing.
  • Understand how impaired CaMKII function in LTMRs affects sensory pathways and pain perception.

Main Methods:

  • Utilized rat models of sensory deprivation (whisker clipping, tail suspension, casting).
  • Measured CaMKII autophosphorylation in sensory neurons.
  • Examined action potential generation in LTMRs using excised skin preparations.
  • Investigated neuronal signaling in the dorsal root ganglion (DRG) and spinal cord.

Main Results:

  • Sensory neuron CaMKII autophosphorylation levels correlated with LTMR activity.
  • Blocking CaMKII impaired LTMR adaptation and natural filtering of impulse trains.
  • CaMKII blockade in LTMRs reduced dorsal horn inhibition, activating pain-sensing neurons.
  • Reduced CaMKII function led to pain behaviors in response to low-intensity mechanical stimuli.

Conclusions:

  • CaMKII activity in LTMRs is crucial for normal touch adaptation and sensory gating.
  • Loss of CaMKII function due to sensory disuse transforms the touch pathway into a pain system.
  • Sensory deprivation-induced changes in CaMKII may contribute to chronic pain and hinder rehabilitation.