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Morphine promotes apoptosis in Jurkat cells.
P C Singhal1, A A Kapasi, K Reddy
1Department of Medicine, Long Island Jewish Medical Center, New Hyde Park, New York 11040, USA.
Journal of Leukocyte Biology
|October 26, 1999
Summary
Morphine, a key component in heroin, triggers programmed cell death (apoptosis) in T lymphocytes, crucial immune cells. This morphine-induced apoptosis may weaken the immune system in individuals with heroin addiction, increasing infection risk.
Area of Science:
- Immunology
- Cell Biology
- Pharmacology
Background:
- Intravenous heroin addiction is linked to severe, often fatal, recurrent infections.
- Opioid use, particularly morphine, is suspected to directly impair immune function in these patients.
Purpose of the Study:
- To investigate the direct effect of morphine on T lymphocyte apoptosis.
- To elucidate the mechanisms underlying morphine-induced T lymphocyte cell death.
Main Methods:
- Assessed the impact of morphine on Jurkat cells and primary human T lymphocytes.
- Utilized a mu-opioid receptor agonist (DAGO) to confirm receptor involvement.
- Measured DNA fragmentation, reactive oxygen species (ROS) levels, and expression of apoptosis-related proteins (bcl-2, bax).
- Analyzed caspase-3 activation.
Main Results:
- Morphine dose-dependently induced apoptosis in both Jurkat cells and T lymphocytes.
- Mu-opioid receptor activation promoted Jurkat cell apoptosis.
- Morphine treatment led to DNA fragmentation and altered bcl-2/bax ratios, favoring apoptosis.
- Reactive oxygen species (ROS) generation was implicated, with superoxide dismutase (SOD) enhancing and catalase attenuating apoptosis.
- Caspase-3 activation was observed in morphine-treated cells.
Conclusions:
- Morphine directly induces T lymphocyte apoptosis, potentially via ROS generation.
- The modulation of bcl-2 and bax expression, along with caspase-3 activation, are key events in this process.
- These findings support the hypothesis that morphine compromises immune function in heroin addiction by promoting T lymphocyte apoptosis.