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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.
Abstract:
Patients with intravenous heroin addiction are prone to recurrent infections and at times these infections are fatal. We evaluated the effect of morphine on the apoptosis of Jurkat cells and freshly isolated human T lymphocytes. Morphine promoted apoptosis of both the Jurkat cells and the freshly isolated T lymphocytes in a dose-dependent manner. DAGO, a specific mu receptor agonist, also promoted Jurkat cell apoptosis. DNA isolated from morphine-treated Jurkat cells and T lymphocytes also showed integer multiples of 200 base pairs. Superoxide dismutase (SOD) enhanced lymphocyte apoptosis; whereas catalase attenuated the morphine-induced apoptosis of Jurkat cells as well as of T lymphocytes. Morphine-treated Jurkat cells also showed a decreased expression of bcl-2 and an enhanced expression of bax. In addition, morphine-treated Jurkat cells showed activation of caspase-3. These results indicate that morphine-induced T lymphocyte apoptosis may be mediated through the generation of reactive oxygen species. The change in ratio of bax and bcl-2 seems to tilt the balance toward apoptosis, leading to the activation of caspase-3. This study provides further support for the hypothesis that morphine may be directly compromising immune function by enhancing apoptosis of T lymphocytes in patients with heroin addiction.
Insights
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.