Abstract

Feline immunodeficiency virus (FIV) infection causes a widespread natural immunodeficiency syndrome in cats that is considered a suitable animal model for studying human immunodeficiency virus (HIV) infection and pathogenesis. Short term cultures of bone marrow derived feline macrophages stimulated with recombinant feline interferon-γ (r-IFN-γ) and lipopolysaccharide (LPS) were shown to produce nitric oxide. Feline macrophages were shown to express cannabinoid receptors, and nitric oxide production decreased after in vitro exposure to synthetic cannabinoid CP-55940. Both cannabinoid receptors, CB1 and CB2, were involved in this process, since the inhibition was reversed by selective cannabinoid antagonists for both of these receptors.

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