IL-1 beta-like Freund's adjuvant enhances axonal transport of opiate receptors in sensory neurons.

Abstract

Chronic pain and inflammation increase substance P in sensory fibres of peripheral nerves in which opiate receptors are known to undergo axonal transport. The aim of the present study was to evaluate a possible modulation of axonal transport of opiate receptors in peripheral nerves during inflammation. After intraplantar injection of Freund's adjuvant to rats, the accumulation of mu and kappa opiate receptors increased on both sides of ligature in sciatic nerves of the injected paw. The contralateral side was unaffected and may serve as control. When IL-1 beta was injected into rat paws, the axonal transport of opiate receptors was increased in a similar way. This suggests that IL-1 beta represents a major mediator to sensitize nociceptors during inflammation through a process requiring retrograde signals.

• Authors: A P Jeanjean, J M Maloteaux, P M Laduron
• Journal: Neuroscience letters (Neurosci Lett) Vol. 177 Issue 1-2 Pg. 75-8 (Aug 15 1994) ISSN: 0304-3940 [Print] Ireland
• PMID: 7529908 (Publication Type: Journal Article)

Chemical References

• Enkephalins
• Interleukin-1
• Nerve Tissue Proteins
• Receptors, Opioid, kappa
• Receptors, Opioid, mu
• Enkephalin, Ala(2)-MePhe(4)-Gly(5)-
• Enkephalin, Leucine-2-Alanine
• Freund's Adjuvant

Topics

• Animals
• Axonal Transport (drug effects)
• Enkephalin, Ala(2)-MePhe(4)-Gly(5)-
• Enkephalin, Leucine-2-Alanine (metabolism)
• Enkephalins (metabolism)
• Foot
• Freund's Adjuvant (pharmacology, toxicity)
• Inflammation (chemically induced)
• Interleukin-1 (pharmacology)
• Ligation
• Male
• Nerve Tissue Proteins (metabolism)
• Neurons, Afferent (drug effects, metabolism)
• Nociceptors (metabolism)
• Rats
• Rats, Wistar
• Receptors, Opioid, kappa (drug effects, metabolism)
• Receptors, Opioid, mu (drug effects, metabolism)
• Sciatic Nerve (metabolism)