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The effects of corticosteroids on mucous glycoprotein secretion from human airways in vitro.

In order to examine the mechanisms by which corticosteroids may benefit some patients with bronchorrhea, cultured human airways releasing [3H]glucosamine labeled mucous glycoproteins were exposed to corticosteroids, and mucus release was examined. Both dexamethasone and methylprednisolone produced dose-related suppression of the spontaneous release of radiolabeled mucous glycoproteins. The inhibitory effects of dexamethasone were maximal after 18 to 24 h and returned to control levels by 34 h. In order to study the effects of dexamethasone on stimulated mucus release, airways were exposed to dexamethasone and to the mucus secretagogues, histamine or 5-monohydroxyeicosatetraenoic acid. Both of these secretagogues stimulated radiolabeled mucous glycoprotein release from airways that had never been exposed to corticosteroids, as well as in a reduced fashion from corticosteroid-treated airways. The reduced mucus release caused by secretagogues from dexamethasone-treated airways appeared to reflect a lowered baseline secretion rate rather than a specific inhibition of either secretagogue.