Glucocorticoids synthase induction inhibition

Di Rosa, M., Radomski, M., Carnuccio, R. and Moncada, S. (1990). Glucocorticoids inhibit the induction of nitric oxide synthase in macrophages. Biochem. Biophys. Res. Commun. 173, 1246-1252. 

NITRERGIC STIMULANTS mimic, or cause the production and release of nitric oxide (NO), which is an important mediator that is synthesized on demand. The actions of nitric oxide are very widespread, and imbalance is likely to be involved in a number of disease states. Nitric oxide synthase (NOS) has a widespread distribution in the body, and isoforms are recognized specifically constitutive and inducible (iNOS) forms. Both forms are cytosolic, Ca /calmodulin and NADPH-dependent, and inhibited by L-arginine derivatives. Induction of iNOS is by various inflammatory cytokines, particularly those stimulated by bacterial lipopolysaccarides, including tumour necrosis factor a. interferon 7 and interleukin 1 p. Induction of iNOS only is inhibited by GLUCOCORTICOIDS. 

Knowles RG, Salter M, Brooks SL, Moncada S. Anti-inflammatory glucocorticoids inhibit the induction by endotoxin of nitric oxide synthase in the lung, liver and aorta of the rat. Biochem Biophys Res Commun 1990 172(3) 1042-1048. 

---