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- Title
β<sub>2</sub>-Adrenoceptor stimulation augments the IL-4-induced CD23 expression and release and the expression of differentiation markers (CD14, CD18) by the human monocytic cell line, U 937.
- Authors
Paul-Eugene, N.; Dugas, B.; Gordon, J.; Kolb, J. P.; Cairns, J. A.; Paubert-Braquet, M.; Mencia-Huerta, J. M.; Braquet, P.
- Abstract
The effect of β2-adrenoceptor agonists and interleukin-4 (IL-4) on the CD23 expression on, and release from, the human promonocytic cell line, U 937, was investigated. As assessed by flow cytometry, incubation of U 937 cells in the presence of salbutamol, fenoterol or IL-4 induced a concentration- and time-dependent increase in CD23 expression, that was maximal after 48 hr and followed by a decrease thereafter. In addition, salbutamol potentiated the effect of IL-4, the optimal concentration of the drug being a function of the concentration of this cytokine. This synergy between IL-4 and β2-adrenoceptor agonists was also observed for the release of the soluble form of CD23. The effect on CD23 expression of salbutamol and fenoterol, but not of IL-4, was blocked in the presence of D,L-propranolol (1 μM) or butoxamine (1 μM). The α- adrenoceptor agonist, norepinephrine (1 μM), was ineffective in inducing CD23 expression or potentiating the one evoked by IL-4. Salbutamol down-regulated the expression of FcγRI (CD64) and FcγRII (CD32) whereas IL-4 was ineffective. Only when added together at the onset of the culture did salbutamol and IL-4 induce, after 48 hr, the expression of the monocyte marker, CD14. The expression of CD18 was up- regulated in response to salbutamol either alone or in combination with IL-4, this cytokine alone being inefficient. These data suggest that IL-4 and β2-adrenoceptor agonists induce differentiation of U 937 cells into monocyte-like cells.
- Subjects
CD23 antigen; GENE expression; ADRENERGIC beta agonists; INTERLEUKIN-4; PHARMACOLOGY; THERAPEUTICS
- Publication
Clinical & Experimental Allergy, 1993, Vol 23, Issue 4, p317
- ISSN
0954-7894
- Publication type
Article
- DOI
10.1111/j.1365-2222.1993.tb00329.x