PPAR gamma-dependent anti-inflammatory action of rosiglitazone in human monocytes: suppression of TNF alpha secretion is not mediated by PTEN regulation.
Biochem Biophys Res Commun
; 303(3): 782-7, 2003 Apr 11.
Article
em En
| MEDLINE
| ID: mdl-12670479
ABSTRACT
Thiazolidinediones (TZDs) are insulin-sensitising drugs that are ligands for the nuclear receptor PPAR gamma. They have been shown to inhibit PMA-stimulated secretion of TNFalpha from human monocytes, although only at concentrations well in excess of circulating levels observed during TZD therapy, suggesting a mechanism of action independent of PPAR gamma activation. Here we show that insulin-sensitising concentrations of the TZD rosiglitazone partially inhibit serum- or LPS- (but not PMA-) stimulated TNF alpha secretion from primary human monocytes, with an IC(50) of around 50nM. We also show that the observed effects are independent of PPAR gamma-mediated regulation of the lipid phosphatase PTEN. Reversed stimulus specificity, IC(50) in the insulin-sensitising range, and the fact that partial inhibition of TNF alpha secretion is also observed with a structurally unrelated PPAR gamma agonist, GW7845, demonstrate a mechanism of action distinct from that observed with higher TZD concentrations. These findings thus represent the first report of a PPAR gamma-dependent and therapeutically relevant anti-inflammatory action of TZDs in isolated human monocytes.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tiazóis
/
Tirosina
/
Fatores de Transcrição
/
Monócitos
/
Anti-Inflamatórios não Esteroides
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Fator de Necrose Tumoral alfa
/
Proteínas Serina-Treonina Quinases
/
Receptores Citoplasmáticos e Nucleares
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Monoéster Fosfórico Hidrolases
/
Proteínas Supressoras de Tumor
Limite:
Humans
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article