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Related Experiment Video

Updated: Feb 9, 2026

Chronic Constriction of the Sciatic Nerve and Pain Hypersensitivity Testing in Rats
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Ca2+-binding protein NECAB2 facilitates inflammatory pain hypersensitivity.

Ming-Dong Zhang1, Jie Su1, Csaba Adori1

  • 1Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.

The Journal of Clinical Investigation
|June 13, 2018
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Summary

N-terminal EF-hand Ca2+-binding protein 2 (NECAB2) is crucial for pain signaling. Inactivating NECAB2 in mice significantly reduced inflammatory pain sensitivity, identifying it as a potential therapeutic target for pain relief.

Keywords:
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Area of Science:

  • Neuroscience
  • Pain Research
  • Molecular Biology

Background:

  • Pain signals involve multisynaptic glutamatergic pathways, with the initial synapse between nociceptors and spinal interneurons being critical for sensory gating.
  • Glutamate release at this synapse is regulated by Ca2+-sensor proteins, including N-terminal EF-hand Ca2+-binding protein 2 (NECAB2), which is highly abundant.

Purpose of the Study:

  • To investigate the role of NECAB2 in pain signaling pathways.
  • To determine the functional significance of NECAB2 in dorsal root ganglia (DRGs) and spinal cord neurons.
  • To explore NECAB2 as a potential target for pain relief.

Main Methods:

  • Histochemical analyses and single-cell RNA-sequencing to identify NECAB2 expression patterns.
  • Utilizing Necab2 knockout (Necab2-/-) mice to assess pain sensation after peripheral inflammation.
  • Employing genetic tools to trace activated neurons and investigate NECAB2's role in specific neuronal populations.

Main Results:

  • NECAB2 is expressed in specific DRG neurons (low-threshold mechanoreceptors) and spinal interneurons (protein kinase C γ).
  • Peripheral nerve injury downregulates NECAB2, and Necab2-/- mice exhibit faster resolution of inflammatory pain.
  • NECAB2 dampens excitatory transmission and limits pronociceptive brain-derived neurotrophic factor (BDNF) release, with its spinal and DRG expression controlling hypersensitivity.

Conclusions:

  • NECAB2 is identified as a critical component in pronociceptive pain signaling.
  • Inactivation of NECAB2 provides substantial pain relief, highlighting its therapeutic potential for inflammatory pain conditions.