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(Circulation Research. 2009;104:1049.)
© 2009 American Heart Association, Inc.

Molecular Medicine

Antiinflammatory Effects of the ETS Factor ERG in Endothelial Cells Are Mediated Through Transcriptional Repression of the Interleukin-8 Gene

Lei Yuan, Vesna Nikolova-Krstevski, Yumei Zhan, Maiko Kondo, Manoj Bhasin, Laya Varghese, Kiichiro Yano, Chris V. Carman, William C. Aird, Peter Oettgen

From the Divisions of Cardiology (L.Y., V.N.-K., Y.Z., M.K., P.O.), Molecular and Vascular Medicine (L.Y., V.N.-K., Y.Z., M.K., L.V., K.Y., C.V.C., W.C.A., P.O.), and Interdisciplinary Medicine and Biotechnology (M.B.); Department of Medicine; and Center for Vascular Biology Research (L.Y., V.N.-K., Y.Z., M.K., L.V., K.Y., C.V.C., W.C.A., P.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Mass.

Correspondence to Dr. Peter Oettgen, Division of Cardiology, Department of Medicine, and the Center for Vascular Biology Research, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215. E-mail joettgen{at}bidmc.harvard.edu

ERG (Ets-related gene) is an ETS transcription factor that has recently been shown to regulate a number of endothelial cell (EC)-restricted genes including VE-cadherin, von Willebrand factor, endoglin, and intercellular adhesion molecule-2. Our preliminary data demonstrate that unlike other ETS factors, ERG exhibits a highly EC-restricted pattern of expression in cultured primary cells and several adult mouse tissues including the heart, lung, and brain. In response to inflammatory stimuli, such as tumor necrosis factor-, we observed a marked reduction of ERG expression in ECs. To further define the role of ERG in the regulation of normal EC function, we used RNA interference to knock down ERG. Microarray analysis of RNA derived from ERG small interfering RNA– or tumor necrosis factor-–treated human umbilical vein (HUV)ECs revealed significant overlap (P<0.01) in the genes that are up- or downregulated. Of particular interest to us was a significant change in expression of interleukin (IL)-8 at both protein and RNA levels. Exposure of ECs to tumor necrosis factor- is known to be associated with increased neutrophil attachment. We observed that knockdown of ERG in HUVECs is similarly associated with increased neutrophil attachment compared to control small interfering RNA–treated cells. This enhanced adhesion could be blocked with IL-8 neutralizing or IL-8 receptor blocking antibodies. ERG can inhibit the activity of the IL-8 promoter in a dose dependent manner. Direct binding of ERG to the IL-8 promoter in ECs was confirmed by chromatin immunoprecipitation. In summary, our findings support a role for ERG in promoting antiinflammatory effects in ECs through repression of inflammatory genes such as IL-8.

Key Words: ETS factor • interleukin-8 • inflammation • Tumor necrosis factor-