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Related Experiment Videos

Nuclear receptor activation and interaction with morphine.

Walter Royal1, Michelle Leander, Yuqing E Chen

  • 1Neuroscience Institute, Morehouse School of Medicine, MRC 214, 720 Westview Drive, S.W., Atlanta, GA 30310, USA. wroyal@msm.edu

Journal of Neuroimmunology
|December 8, 2004
PubMed
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Activating specific nuclear receptors may help treat HIV-associated neurological diseases by suppressing inflammation. However, morphine can reverse these beneficial effects, indicating complex interactions requiring further study.

Area of Science:

  • Neuroimmunology
  • Molecular Biology
  • Pharmacology

Background:

  • HIV-associated neurological diseases involve inflammation and oxidative stress, potentially worsened by opioid abuse.
  • Steroid-lipid nuclear receptors, including retinoic acid receptor (RAR), retinoid X receptor (RXR), and peroxisome proliferator-activated receptor (PPAR) gamma, play roles in cellular responses.
  • Tumor necrosis factor-alpha (TNF-alpha) and inducible nitric oxide synthase (iNOS) are key inflammatory mediators implicated in neuroinflammation.

Purpose of the Study:

  • To investigate the effects of activating RAR, RXR, and PPAR gamma on TNF-alpha production and iNOS gene expression in stimulated immune cells.
  • To examine the influence of morphine on these inflammatory responses and nuclear receptor-mediated suppression.
  • To explore the potential therapeutic implications of nuclear receptor activation for HIV-associated neurological disorders.

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Main Methods:

  • U937 and SVG cells were stimulated to induce inflammatory responses.
  • Cells were treated with activators of RAR, RXR, and PPAR gamma (e.g., LG101305, ciglitazone).
  • TNF-alpha production and iNOS gene expression were measured, along with the effects of morphine co-administration.

Main Results:

  • Activation of nuclear receptors significantly suppressed TNF-alpha production and iNOS gene expression in stimulated cells.
  • Morphine reversed the suppressive effects of nuclear receptor activation on TNF-alpha in PHA-stimulated U937 cells.
  • Preliminary data suggested a similar, though less consistent, interaction between morphine and nuclear receptor activators in LPS/interferon-gamma-stimulated SVG cells.

Conclusions:

  • Specific nuclear receptor activation shows potential for treating HIV-associated neurological disease by mitigating inflammation.
  • Interactions between nuclear receptor pathways and opioids, like morphine, can modulate these anti-inflammatory effects.
  • Further research is needed to elucidate the mechanisms underlying these complex interactions for therapeutic development.