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Human white blood cells synthesize morphine: CYP2D6 modulation
Wei Zhu1, Patrick Cadet, Geert Baggerman
1Neuroscience Research Institute, State University of New York College at Old Westbury, Old Westbury, NY 11568, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|November 23, 2005
Summary
Human white blood cells (WBC) synthesize and release morphine, a key pain-relieving compound. This discovery reveals new pathways for morphine production and suggests immune cell involvement in pain regulation.
Area of Science:
- Immunology
- Biochemistry
- Neuroscience
Background:
- Physiologically significant concentrations of morphine exist in human plasma.
- Morphine levels can increase after trauma or exercise.
Purpose of the Study:
- To investigate the presence and synthesis of morphine in human white blood cells (WBC).
- To identify the enzymes and pathways involved in morphine synthesis within WBC.
- To determine if WBC release morphine and its potential signaling role.
Main Methods:
- Analysis of human white blood cells (polymorphonuclear cells) for morphine content and synthesis.
- Detection of CYP2D6 enzyme expression in WBC.
- Investigation of morphine synthesis via L-DOPA pathway.
- Measurement of morphine release from WBC.
Main Results:
- Normal human WBC contain and synthesize morphine.
- WBC express CYP2D6, an enzyme crucial for morphine synthesis.
- A novel pathway for morphine synthesis via L-DOPA was identified.
- WBC release morphine into their environment, suggesting autocrine signaling via mu3 opiate receptors.
Conclusions:
- Morphine synthesis is more widespread than previously known, including human immune cells.
- A new intersection between dopamine and morphine pathways exists via L-DOPA.
- WBC-derived morphine may play a role in immune cell self-regulation and intercellular communication.