Inflammatory hyperalgesia: a role for the C-fiber sensory neuron cell body?

The Journal of Pain : Official Journal of the American Pain Society
Elizabeth J Katz, Michael S Gold

Abstract

Peripheral nerve injury increases the chemosensitivity and excitability of injured afferents, resulting in ectopic activity arising from within dorsal root ganglia. Studies of dissociated sensory ganglion neurons in vitro suggest afferent somata might be sensitized by persistent inflammation. However, it is unknown whether this inflammation-induced sensitization is manifest in somata within the intact ganglia. To explore this possibility, intracellular electrophysiologic recording was used with a sciatic nerve-L4-dorsal root ganglia preparation to compare excitability and chemosensitivity of cutaneous C-fiber somata from control and inflamed rats. Cutaneous afferents were identified with the retrograde dye DiI. Excitability was assessed before and after the application of inflammatory soup (IS) containing bradykinin, serotonin, and prostaglandin E2 all at a pH of 7.0. Persistent inflammation decreased the excitability of cutaneous afferents in intact ganglia and had no significant influence on the magnitude of IS-induced increase in excitability. Opposite to the effects observed in intact ganglia, excitability was greater in dissociated cutaneous nociceptors obtained from inflamed rats, although the magnitude of the IS-induced ...Continue Reading

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Citations

Nov 5, 2010·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Supinder S BediEdgar T Walters
Jul 12, 2014·Cell and Tissue Research·Anna M Hagenston, Manuela Simonetti
Jan 25, 2011·Burns : Journal of the International Society for Burn Injuries·Kawther HamedMark W Fear
May 19, 2011·Doklady. Biochemistry and Biophysics·K N KashkinE D Sverdlov
May 26, 2017·The Clinical Journal of Pain·Kimberly T SibilleRoger B Fillingim

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