PMID: 9438493Jan 23, 1998Paper

Anti-inflammatory effect of beta 2-agonists: inhibition of TNF-alpha release from human mast cells

The Journal of Allergy and Clinical Immunology
E Y Bissonnette, A D Befus

Abstract

Beta 2-agonists inhibit the release of preformed mediators such as histamine and newly synthesized mediators such as prostaglandin D2 from mast cells. However, although mast cells have been identified as an important source of several cytokines including tumor necrosis factor-alpha (TNF-alpha), there is no information about their regulation by beta 2-agonists. Thus given the importance of TNF-alpha in inflammation and the widespread use of beta 2-agonists, we investigated the effect of long-acting (salmeterol) and short-acting (salbutamol) beta 2-agonists on the secretion of TNF-alpha from human skin mast cells. Treatment of mast cells with salmeterol or salbutamol (100 nmol/L) inhibited the IgE-dependent release of TNF-alpha (82% and 74%, respectively). Moreover, 2-hour treatment with salmeterol, isoproterenol, or salbutamol inhibited mast cell cytotoxicity against a TNF-alpha-sensitive cell line, WEHI-164, with an IC50 of 71, 50, and 29 nmol/L, respectively. Specificity for beta-adrenergic receptors was shown with propranolol. The inhibitory effect of beta 2-agonists was observed after only 20 minutes of treatment but was lost by 24 hours after removal of salbutamol and isoproterenol (7% and 11% inhibition remaining, respecti...Continue Reading

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