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Murine macrophage cell lines contain mu 3-opiate receptors
M H Makman1, B Dvorkin, G B Stefano
1Department of Biochemistry, Albert Einstein College of Medicine, New York, NY 10461, USA.
Abstract:
Opiate alkaloid-selective, opioid peptide-insensitive mu 3 receptors are present in three murine macrophage cell lines (J774.2; RAW 264.7; BAC1.2F5). The receptor binds morphine, its active metabolite morphine 6-glucuronide and certain other alkaloids, but not morphine 3-glucuronide or any of the opioid peptides tested. The cell lines thus provide valuable model systems for investigation of mu 3-opiate receptors, previously demonstrated to mediate inhibitory effects of morphine on activation of human peripheral blood macrophages (monocytes).
Insights
Murine macrophage cell lines express mu 3-opiate receptors that bind specific opiate alkaloids but not opioid peptides. These cell lines serve as models for studying mu 3 receptors and their effects on macrophage activation.
Area of Science:
- Immunology and Pharmacology
- Cell Biology and Receptor Studies
Background:
- Mu 3-opiate receptors are known to be opioid peptide-insensitive and selective for opiate alkaloids.
- Previous research indicated that morphine's effects on human peripheral blood macrophage activation are mediated by mu 3 receptors.
Purpose of the Study:
- To identify and characterize murine macrophage cell lines expressing functional mu 3-opiate receptors.
- To establish these cell lines as valuable in vitro models for investigating mu 3 receptor pharmacology and function.
Main Methods:
- Utilized three distinct murine macrophage cell lines: J774.2, RAW 264.7, and BAC1.2F5.
- Investigated the binding properties of the mu 3 receptors within these cell lines using various opiate alkaloids and opioid peptides.
Main Results:
- All three murine macrophage cell lines (J774.2, RAW 264.7, BAC1.2F5) were confirmed to express mu 3-opiate receptors.
- The identified mu 3 receptors demonstrated selective binding for morphine and morphine 6-glucuronide, but not morphine 3-glucuronide or tested opioid peptides.
Conclusions:
- The characterized murine macrophage cell lines provide robust and relevant model systems for in-depth study of mu 3-opiate receptors.
- These models will facilitate further research into the specific mechanisms by which mu 3 receptors influence macrophage function and opioid signaling.