Chloroquine inhibits inducible nitric oxide synthase expression in murine peritoneal macrophages.

Induction of inducible nitric oxide synthase in vivo or in vitro in response to stimuli is only temporary. However, chronic localized expression of inducible nitric oxide synthase in certain organs has been associated with the development of autoimmune diseases or chronic inflammatory diseases. Chloroquine is being used as an antiinflammatory drug, and its inhibitory effect on the synthesis of pro-inflammatory cytokines, such as tumour necrosis factor-alpha and interferon-gamma, has been reported. In this study, we examined whether chloroquine could inhibit nitric oxide synthesis in murine peritoneal macrophages stimulated with interferon-gamma and lipopolysaccharide. Although prolonged incubation of cells with high concentrations of chloroquine showed some cytotoxicity, the drug itself was not cytotoxic when macrophages were preincubated with chloroquine for 2 hr, washed and stimulated with interferon-gamma and lipopolysaccharide in the absence of chloroquine for another 48 hr. The nitric oxide production from stimulated macrophages was markedly reduced by chloroquine in a dose-dependent manner and induction of inducible nitric oxide synthase mRNA was also suppressed by chloroquine pretreatment. These results show that chloroquine inhibits the induction of inducible nitric oxide synthase from interferon-gamma and lipopolysaccharide-stimulated macrophages, thereby reducing nitric oxide synthesis.