A new mechanism involving ERK contributes to rosiglitazone inhibition of tumor necrosis factor-alpha and interferon-gamma inflammatory effects in human endothelial cells

作者：Lombardi Adriana; Cantini Giulia; Piscitelli Elisabetta; Gelmini Stefania; Francalanci Michela; Mello Tommaso; Ceni Elisabetta; Varano Gabriele; Forti Gianni; Rotondi Mario; Galli Andrea; Serio Mario; Luconi Michaela^*

来源：Arteriosclerosis, Thrombosis, and Vascular Biology, 2008, 28(4): 718-724.

DOI：10.1161/ATVBAHA.107.160713

• thiazolidinediones
• MAPK
• CXCL10
• endothelium
• Th1-response

Objective - Microvascular endothelium is one of the main targets of the inflammatory response. On specific activation, endothelial cells recruit Th1-lymphocytes at the inflammatory site. We investigated the intracellular signaling mediating tumor necrosis factor ( TNF)- alpha and interferon (IFN)-gamma inflammatory response in human microvascular endothelial cells (HMEC-1) and the interfering effects of the peroxisome-proliferator-activated- receptor (PPAR gamma) agonist, rosiglitazone (RGZ).
Methods and Results-TNF alpha and IFN gamma, mainly when combined, stimulate IFN gamma-inducible protein of 10 kDa (IP10) and fractalkine production evaluated by ELISA and TaqMan analyses. This effect is not only mediated by activation of the NFkB and Stat1 classic pathways, but also involves a rapid increase in phosphorylation and activation of extracellular signal-regulated kinases (ERK1/2) as measured by Western blot. RGZ interferes with TNF alpha and IFN gamma stimulation of IP10, fractalkine, and adhesion molecule through a novel rapid mechanism which involves the blocking of ERK activation.
Conclusions - Our findings shed new light on the mechanisms underlying the inflammatory response of microvascular endothelium and on the possible therapeutic use of RGZ in vasculopathies involving Th1-responses.

• 出版日期2008-4