title: Expression of lipocortins in human bronchial epithelial cells: effects of IL-1beta , TNF-alpha, LPS and dexamethasone.
abstract: In this study, we investigated the expression of lipocortin I and II (annexin I and I in the human bronchial epithelium, both in vivo and in vitro. A clear expression of lipocortin I and II protein was found in the epithelium in sections of bronchial tissue. In cultured human bronchial epithelial cells we demonstrated the expression of lipocortin I and II mRNA and protein using Northern blotting, FACScan analysis and ELISA. No induction of lipocortin I or II mRNA or protein was observed after incubation with dexamethasone. Stimulation of bronchial epithelial cells with IL-1beta, TNF-alpha or LPS for 24 h did not affect the lipocortin I or II mRNA or protein expression, although PGE(2) and 6-keto-PGF(1alpha) production was significantly increased. This IL-1beta- and LPS-mediated increase in eicosanoids could be reduced by dexamethasone, but was not accompanied by an increase in lipocortin I or II expression. In human bronchial epithelial cells this particular glucocorticoid action is not mediated through lipocortin I or II induction.
authors.affiliation: Department of Immunology Erasmus University and Academic Hospital Dijkzigt Rotterdam The Netherlands.
authors.forename: M M
authors.initials: MM
authors.lastname: Verheggen
authors.forename: H I
authors.initials: HI
authors.lastname: Bont
authors.forename: P W
authors.initials: PW
authors.lastname: Adriaansen-Soeting
authors.forename: B J
authors.initials: BJ
authors.lastname: Goense
authors.forename: C J
authors.initials: CJ
authors.lastname: Tak
authors.forename: H C
authors.initials: HC
authors.lastname: Hoogsteden
authors.forename: P T
authors.initials: PT
authors.lastname: Hal
authors.forename: M A
authors.initials: MA
authors.lastname: Versnel