Interleukin-6 (IL-6) is markedly upregulated in the peripheral and central nervous systems following nerve injury; however, the functional effects of this are unclear. This study investigates the effect of peripheral interleukin-6 on nociceptive transmission in naive and neuropathic states. Using an in vitro rat skin-nerve preparation, 50 ng interleukin-6 inhibited responses of single nociceptive fibers to noxious heat. A 20-ng sample of interleukin-6 only inhibited heat responses in the presence of soluble interleukin-6 receptors. To examine in vivo effects of peripheral interleukin-6, extracellular recordings from dorsal horn neurons were made in anaesthetised naive, sham-operated and neuropathic (spinal nerve ligated) rats. Peripheral interleukin-6 (40-100 ng) markedly inhibited all naturally evoked neuronal responses in naive rats, yet only neuronal responses to heat in neuropathic rats. Behaviourally, intraplantar administration of interleukin-6 (0.01-1 microg) elicited ipsilateral thermal hypoalgesia in naive rats. Thus, interleukin-6 inhibits normal peripheral nociceptive transmission, yet such anti-nociceptive effects are attenuated following nerve injury in a modality-specific manner.
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