Elsevier

Immunology Letters

Volume 49, Issue 3, March 1996, Pages 143-147
Immunology Letters

Modulation of lipopolysaccharide-induced tumor necrosis factor-α and nitric oxide production by dopamine receptor agonists and antagonists in mice

https://doi.org/10.1016/0165-2478(96)02494-7Get rights and content

Abstract

The effects of various agonists and antagonists of dopamine D1 and D2 receptors on lipopolysaccharide (LPS)-induced tumor necrosis factor-α (TNF-α) and nitrix oxide (NO) production was investigated in mice. Pretreatment of animals with bromocryptine or quinpirole, agonists of dopamine D2 receptors caused a blunting of both the TNF-α and NO responses to LPS injected intraperitoneally. Sulpiride, an antagonist of dopamine D2 receptors, decreased the LPS-induced TNF-α plasma levels in a dose-dependent manner and inhibited the LPS-induced NO production by peritoneal macrophages. Bromocryptine or quinpirole blunted both the TNF-α and NO response to LPS. SCH-23390, an antagonist of dopamine D1 receptors did not alter LPS-induced TNF-α production, but inhibited LPS-induced NO production. These results indicate that while the D2 subtype of dopamine receptors is involved in the modulation of both LPS-induced TNF-α and NO production, dopamine D1 receptors only regulate the production of NO. Since several drugs possess effect on dopamine D2 receptors, the present observations may be of clinical relevance.

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