RT Journal Article SR Electronic T1 Modulation by cAMP of IL‐1β‐induced eotaxin and MCP‐1 expression and release in human airway smooth muscle cells JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 220 OP 226 DO 10.1183/09031936.03.00112002 VO 22 IS 2 A1 W.A. Wuyts A1 B.M. Vanaudenaerde A1 L.J. Dupont A1 M.G. Demedts A1 G.M. Verleden YR 2003 UL http://erj.ersjournals.com/content/22/2/220.abstract AB Inflammatory cells, such as eosinophils, seem to be key players in the inflammatory process of asthma. These cells are attracted by chemokines, for example eotaxin and monocyte chemotactic protein (MCP‐1). In this study, the authors investigated whether eotaxin and MCP‐1 expression and release in human airway smooth muscle cells could be modulated by an increase in intracellular cyclic adenosine monophosphate (cAMP) concentration. The possible involvement of cAMP‐dependent protein kinase A (PKA) was also studied. Forskolin, a direct stimulator of adenylyl cyclase, decreased the interleukin (IL)‐1β‐induced eotaxin and MCP‐1 release by 73±8 and 65±6%, respectively. 8Bromo‐cAMP, a cAMP analogue, similarly decreased the chemokine production by 58±9 and 63±8% for eotaxin and MCP‐1, respectively. Prostaglandin E2, known as an activator of the prostanoid receptors EP2 and EP4, which are positively coupled to adenylyl cyclase, also decreased the IL‐1β‐induced eotaxin and MCP‐1 production by 57±17 and 53±4%, respectively. H‐89, an inhibitor of PKA, was able to inhibit the decrease in eotaxin and MCP‐1 protein release induced by forskolin. Using Western-blot analysis, no effect of cAMP was found on the IL‐1β‐induced p38 mitogen-activated protein kinase, extracellular signal-related kinase or cJun N‐terminal kinase activation. This study shows that an increase in intracellular cyclic adenosine monophosphate concentration may decrease the interleukin‐1β‐induced eotaxin and monocyte chemotactic protein‐1 expression and production. This can be inhibited by addition of H‐89, an inhibitor of cyclic adenosine monophosphate-dependent protein kinase. No decrease was observed in interleukin‐1β‐induced p38 mitogen-activated protein kinase, extracellular signal-related kinase or cJun N‐terminal kinase activation. These findings may be important for the further development of new anti-inflammatory drugs. W.A. Wuyts is a research fellow of the Fonds voor wetenschappelijk onderzoek Vlaanderen. This study was funded by the Fonds voor wetenschappelijk onderzoek Vlaanderen G 0220.99. G.M. Verleden is a holder of the GSK Chair for pulmonary pharmacology at the Katholieke Universiteit Leuven.