© The Board of Management and Trustees of the British Journal of Anaesthesia 2005
Editorial II: Opioids and the neuroimmune axis
University Department of Cardiovascular Sciences (Pharmacology and Therapeutics Group), Division of Anaesthesia, Critical Care and Pain Management, LRI, Leicester LE1 5WW, UK
* Corresponding author. E-mail: dgl3@le.ac.uk
| The first 150 words of the full text of this article appear below. |
In 1998, this journal published an editorial exploring the connection between opioids and the immune system.1 In the intervening 6 yr, our understanding of the peripheral actions of the neuroimmune system has progressed markedly.2 3 The group of Christoph Stein at the Freie Universität, Berlin has been instrumental in the use of basic science approaches to produce a working mechanistic model for potential evaluation in man. Using an inflammatory model in the Wistar rat, a number of pioneering studies4 5 have described the ability of (i) the immune system to deliver endogenous opioids,6 and (ii) inflammation to stimulate delivery of opioid receptors to the site of insult, and hence produce a degree of antinociception.7
When rats are killed up to 24 h after an injection of Freund's complete adjuvant into a hind paw (which produces a local inflammatory response), these animals show an increased expression of mu-opioid receptors in the ipsilateral
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