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Immune or Genetic-Mediated Disruption of CASPR2 Causes Pain Hypersensitivity Due to Enhanced Primary Afferent Excitability. | LitMetric

AI Article Synopsis

  • Human autoantibodies to CASPR2 are linked to neuropathic pain and mutations in CASPR2 are connected to autism spectrum disorders, highlighting sensory dysfunction in these conditions.* -
  • In studies with mice lacking CASPR2, increased pain sensitivity was observed to mechanical stimuli, heat, and other pain-inducing substances, suggesting a role for CASPR2 in pain modulation.* -
  • The research shows that the absence of CASPR2 enhances the excitability of dorsal root ganglion (DRG) neurons, implicating CASPR2 in the regulation of pain responses through its effect on ion channel expression.*

Article Abstract

Human autoantibodies to contactin-associated protein-like 2 (CASPR2) are often associated with neuropathic pain, and CASPR2 mutations have been linked to autism spectrum disorders, in which sensory dysfunction is increasingly recognized. Human CASPR2 autoantibodies, when injected into mice, were peripherally restricted and resulted in mechanical pain-related hypersensitivity in the absence of neural injury. We therefore investigated the mechanism by which CASPR2 modulates nociceptive function. Mice lacking CASPR2 (Cntnap2) demonstrated enhanced pain-related hypersensitivity to noxious mechanical stimuli, heat, and algogens. Both primary afferent excitability and subsequent nociceptive transmission within the dorsal horn were increased in Cntnap2 mice. Either immune or genetic-mediated ablation of CASPR2 enhanced the excitability of DRG neurons in a cell-autonomous fashion through regulation of Kv1 channel expression at the soma membrane. This is the first example of passive transfer of an autoimmune peripheral neuropathic pain disorder and demonstrates that CASPR2 has a key role in regulating cell-intrinsic dorsal root ganglion (DRG) neuron excitability.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6011627PMC
http://dx.doi.org/10.1016/j.neuron.2018.01.033DOI Listing

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