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Morphine-induced macrophage apoptosis: oxidative stress and strategies for modulation

Rajani S Bhat1, Madhu Bhaskaran, Anil Mongia

  • 1Long Island Jewish Medical Center, 410 Lakeville Road, Suite 207, New Hyde Park, NY 11040, USA.

Journal of Leukocyte Biology
|March 25, 2004
PubMed

Insights

Morphine causes macrophage apoptosis via oxidative stress, involving superoxide and nitric oxide (NO) production. Antioxidants and specific inhibitors protect against this effect, confirming oxidative stress

Area of Science:

  • Immunology
  • Cell Biology
  • Pharmacology

Background:

  • Macrophage apoptosis is linked to immune dysfunction in opiate exposure.
  • Oxidative stress is a potential mechanism in opiate-induced cellular changes.

Purpose of the Study:

  • To investigate the role of oxidative stress in morphine-induced macrophage apoptosis.

Main Methods:

  • Macrophages were treated with morphine, antioxidants, and pathway inhibitors (NADPH oxidase, TGF-beta, phospholipase D, calcium chelators/agonists).
  • Superoxide and nitric oxide (NO) production were measured.
  • In vivo studies used N-acetyl cysteine, heme oxygenase induction, and epoetin alpha.

Main Results:

  • Morphine induced macrophage apoptosis, associated with increased superoxide and NO.
  • Antioxidants and inhibitors of NADPH oxidase, TGF-beta, phospholipase D, and calcium signaling attenuated morphine's proapoptotic effects.
  • In vivo interventions prevented morphine-induced apoptosis, confirming oxidative stress involvement.

Conclusions:

  • Morphine-induced macrophage apoptosis is mediated by oxidative stress.
  • Signaling pathways involving NADPH oxidase, TGF-beta, phospholipase D, and calcium ions are critical.
  • Targeting oxidative stress pathways may mitigate opiate-induced immune cell damage.

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