Participation of beta-adrenergic receptors on macrophages in modulation of LPS-induced cytokine release.
J Recept Signal Transduct Res
; 19(1-4): 191-202, 1999.
Article
en En
| MEDLINE
| ID: mdl-10071758
For several years it is known that beta-adrenergic receptor agonists have anti-inflammatory effects. However, little is known about the role of beta-adrenergic receptors on macrophages in the modulation of cytokine production by beta-agonists during inflammation. In this study, the presence of beta-receptors on PMA-differentiated U937 human macrophages, and the participation of these receptors in the modulation of LPS-mediated cytokine production by beta-agonists was investigated. Total beta-receptor expression on undifferentiated (monocyte) and PMA-differentiated U937 cells was established using receptor binding studies on membrane fractions with a radio ligand. The expression of beta-receptors proved to be significantly lower on monocytes than on macrophages, additionally a predominant expression of beta 2-receptors was found. Production of the cytokines TNF-alpha, IL-6, and IL-10 by LPS-stimulated differentiated U937 cells was measured in time. Peak concentrations for TNF-alpha, IL-6 and IL-10 occurred at 3, 12 and 9 hrs, respectively. When differentiated U937 cells were incubated with both LPS and the beta-agonist clenbuterol the production of TNF-alpha and IL-6 was significantly reduced. However the production of IL-10 was increased. To study the mechanism of modulation of cytokine production in more detail, U937 macrophages were incubated with LPS/clenbuterol in combination with selective beta 1- and beta 2-antagonists. These results indicated that the beta 2- and not the beta 1-receptor is involved in the anti-inflammatory activity of clenbuterol.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Citocinas
/
Receptores Adrenérgicos beta
/
Macrófagos
Límite:
Humans
Idioma:
En
Revista:
J Recept Signal Transduct Res
Asunto de la revista:
BIOQUIMICA
/
FISIOLOGIA
Año:
1999
Tipo del documento:
Article
País de afiliación:
Países Bajos
Pais de publicación:
Reino Unido