title: Suppression of Tie-1 in endothelial cells in vitro induces a change in the genome-wide expression profile reflecting an inflammatory function.
abstract: Tie-1 is an endothelial specific receptor tyrosine kinase that is upregulated in diseases such as atherosclerosis and rheumatoid arthritis. We recently demonstrated that Tie-1 induced a proinflammatory response when overexpressed in endothelial cells. Here, we used a complementary approach and suppressed endogenous Tie-1 expression in endothelial cells to examine its function by microarray analysis. Tie-1 appeared to govern expression of many genes involved in inflammation. Expression knockdown of Tie-1 significantly reduced endothelial conditioned medium ability to stimulate MCP-1 production in U937 cells. Collectively, our results support the notion that Tie-1 has an inflammatory function in endothelial cells.
authors.affiliation: Division of Interdisciplinary Medicine and Biotechnology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA. cchan@bidmc.harvard.edu
authors.forename: Barden
authors.initials: B
authors.lastname: Chan
authors.forename: Vikas P
authors.initials: VP
authors.lastname: Sukhatme
mesh_terms: D002478:Cells, Cultured; D042783:Endothelial Cells / Q000187:drug effects* / Q000378:metabolism; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects*; D015894:Genome, Human; D006801:Humans; D007249:Inflammation / Q000235:genetics*; D009000:Monocytes / Q000187:drug effects / Q000502:physiology; D020411:Oligonucleotide Array Sequence Analysis; D034622:RNA Interference / Q000502:physiology; D034741:RNA, Small Interfering / Q000494:pharmacology*; D042810:Receptor, TIE-1 / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D020298:U937 Cells
chemical_list: D034741:RNA, Small Interfering; D042810:Receptor, TIE-1