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The porcine mu opioid receptor: molecular cloning and mRNA distribution in lymphoid tissues
M S Pampusch1, M A Osinski, D R Brown
1Department of Veterinary PathoBiology, University of Minnesota, St. Paul 55108, USA. pampu002@maroon.tc.umn.edu
Abstract:
The porcine mu opioid receptor (pMOR), was cloned from cerebral cortex RNA using PCR methodologies. Porcine MOR is 96% identical with human MOR in amino acid sequence. An RT-PCR survey for pMOR mRNA indicated that pMOR is widely distributed in the gut, and is present in thymus and Peyer's patches but absent in other immune tissues and in isolated immune cells. Based on these findings, it appears that opioids do not exert an immunosuppressive effect through direct interaction with the mu-opioid receptor on immune cells. In certain tissues, however, opioids may modulate immune function indirectly through neuronal MOR.
Insights
The porcine mu-opioid receptor (pMOR) is highly similar to the human version. Opioids may not directly suppress immune cells, but could indirectly modulate immune function via neuronal pMOR.
Area of Science:
- Pharmacology
- Immunology
- Neuroscience
Background:
- The mu-opioid receptor (MOR) plays a role in pain and reward pathways.
- Opioid effects on the immune system are complex and not fully understood.
- Previous research suggests potential interactions between opioids and immune cells.
Purpose of the Study:
- To clone and characterize the porcine mu-opioid receptor (pMOR).
- To investigate the distribution of pMOR mRNA in porcine tissues, including immune and non-immune tissues.
- To determine if opioids directly impact immune cells via pMOR.
Main Methods:
- Cloning of pMOR from porcine cerebral cortex RNA using Polymerase Chain Reaction (PCR).
- Amino acid sequence comparison between porcine MOR and human MOR.
- Reverse Transcription PCR (RT-PCR) to survey pMOR mRNA expression in various tissues.
Main Results:
- Porcine MOR shares 96% amino acid identity with human MOR.
- pMOR mRNA is widely distributed in the gut, thymus, and Peyer's patches.
- pMOR mRNA was notably absent in other immune tissues and isolated immune cells.
Conclusions:
- Opioids likely do not exert immunosuppressive effects through direct interaction with pMOR on immune cells.
- Opioid modulation of immune function may occur indirectly through neuronal MOR in specific tissues.
- Findings suggest a nuanced role for opioids in immune regulation, distinct from direct immune cell receptor interaction.