Sensitization of nociceptive spinal neurons contributes to pain in a transgenic model of sickle cell disease

Giuseppe Cataldo, Sugandha Rajput, Kalpna Gupta, Donald A. Simone

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Chronic pain is a major characteristic feature of sickle cell disease (SCD). The refractory nature of pain and the development of chronic pain syndromes in many patients with SCD suggest that central neural mechanisms contribute to pain in this disease. We used HbSS-BERK sickle mice, which show chronic features of pain similar to those observed in SCD, and determined whether sensitization of nociceptive neurons in the spinal cord contributes to pain and hyperalgesia in SCD. Electrophysiological recordings of action potential activity were obtained from single identified dorsal horn neurons of the spinal cord in anesthetized mice. Compared with control HbAA-BERK mice, nociceptive dorsal horn neurons in sickle mice exhibited enhanced excitability as evidenced by enlarged receptive fields, increased rate of spontaneous activity, lower mechanical thresholds, enhanced responses to mechanical stimuli, and prolonged afterdischarges following mechanical stimulation. These changes were accompanied by increased phosphorylation of mitogen-Activated protein kinases (MAPKs) in the spinal cord that are known to contribute to neuronal hyperexcitability, including c-Jun N-Terminal kinase (JNK), p44/p42 extracellular signaling-regulated kinase (ERK), and p38. These findings demonstrate that central sensitization contributes to pain in SCD.

Original languageEnglish (US)
Pages (from-to)722-730
Number of pages9
JournalPain
Volume156
Issue number4
DOIs
StatePublished - Apr 1 2015

Bibliographical note

Funding Information:
This study was supported by NIH grants R01 HL103773, U01 HL117664-01, and R01 DA011471. Dr G. Cataldo was supported by a grant from the National Institute of Dental and Craniofacial Research (T90 DE0227232).

Publisher Copyright:
© 2015 Lippincott Williams and Wilkins. All rights reserved.

Keywords

  • Central sensitization
  • Electrophysiology
  • Mouse
  • Pain
  • Sickle cell disease
  • Spinal cord

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