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Cannabinoids inhibit nitric oxide production in bone marrow derived feline macrophages

W Ponti1, T Rubino, M Bardotti

  • 1Department of Animal Pathology, Hygiene and Veterinary Public Health, Microbiology and Immunology Unit, via Celoria 10, 20133 Milano, Italy. wilma.ponti@unimi.it

Veterinary Immunology and Immunopathology
|October 6, 2001
PubMed

Insights

Feline immunodeficiency virus (FIV) infection in cats, an animal model for HIV, shows that cannabinoids reduce nitric oxide production in feline macrophages. This effect involves both CB1 and CB2 cannabinoid receptors.

Area of Science:

  • Immunology
  • Virology
  • Pharmacology

Background:

  • Feline immunodeficiency virus (FIV) infection in cats serves as an animal model for human immunodeficiency virus (HIV) research.
  • Macrophages play a crucial role in the immune response during viral infections.

Purpose of the Study:

  • To investigate the effect of cannabinoids on nitric oxide production in feline macrophages.
  • To determine the involvement of cannabinoid receptors (CB1 and CB2) in this process.

Main Methods:

  • Bone marrow-derived feline macrophages were cultured and stimulated with recombinant feline interferon-gamma (r-IFN-gamma) and lipopolysaccharide (LPS).
  • Nitric oxide production was measured following in vitro exposure to the synthetic cannabinoid CP-55940.
  • The effects of selective CB1 and CB2 cannabinoid receptor antagonists were assessed.

Main Results:

  • Stimulated feline macrophages produced nitric oxide.
  • Exposure to the synthetic cannabinoid CP-55940 significantly decreased nitric oxide production.
  • The inhibitory effect of CP-55940 was reversed by selective antagonists for both CB1 and CB2 receptors, indicating their involvement.

Conclusions:

  • Cannabinoid receptor signaling, specifically through CB1 and CB2, modulates nitric oxide production in feline macrophages.
  • These findings contribute to understanding the complex interplay between the endocannabinoid system and immune responses in the context of FIV infection.

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