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Relationship between 4,5-epoxymorphinan structure and in vitro modulation of cell proliferation
Mark R Hutchinson1, Andrew A Somogyi
1Department of Clinical and Experimental Pharmacology, Level 5, Medical School North, University of Adelaide, Frome Road, Adelaide 5005, South Australia, Australia. mark.hutchinson@adelaide.edu.au
European Journal of Pharmacology
|June 24, 2004
Summary
This study investigated how 4,5-epoxymorphinans affect immune cells. Researchers found varied responses, suggesting non-classical opioid receptor activity on immune cells and a link between chemical structure and immune effect.
Area of Science:
- Immunology
- Pharmacology
- Neuroscience
Background:
- Morphine and related 4,5-epoxymorphinans are known to influence immune function.
- The specific opioid receptor characteristics mediating these immunomodulatory effects remain unclear.
Purpose of the Study:
- To investigate the in vitro immunomodulatory effects of 24 structurally related 4,5-epoxymorphinans.
- To characterize the receptor responsible for immunomodulation.
- To determine structure-effect relationships for these compounds.
Main Methods:
- Testing 24 4,5-epoxymorphinans on isolated mouse splenocytes stimulated with concanavalin A.
- Observing and categorizing five distinct immunomodulatory response patterns.
- Analyzing non-stereoselectivity, naloxone sensitivity/insensitivity, and opioid rank order of effect.
Main Results:
- Observed diverse responses including inhibition, induction, and lack of effect.
- Identified specific compounds like oxycodone (inhibitory EC50=1.6 nM) and oxymorphone (induction EC50=20 nM).
- Demonstrated non-stereoselectivity and varied naloxone sensitivity, indicating complex receptor interactions.
Conclusions:
- Established a structure-effect relationship for 4,5-epoxymorphinans on immune cells.
- Provided significant evidence for non-classical opioid receptor function in mediating immunomodulation.
- Highlighted the complex pharmacology of opioids beyond traditional opioid receptors.