title: Upregulation of thromboxane synthase mediates visfatin-induced interleukin-8 expression and angiogenic activity in endothelial cells.
abstract: Thromboxane synthase (TXAS) is an enzyme that catalyzes the synthesis of thromboxane A(2) (TXA(2)). Overexpression of TXAS is associated with a variety of vascular diseases. Recently, we reported that visfatin, a novel adipokine, exhibits angiogenic actions. In this study, we showed that visfatin increased mRNA and protein levels of TXAS and stimulated TXA(2) biosynthesis in vascular endothelial cells. In addition, visfatin induced the expression and secretion of interleukin-8 (IL-8), which is blocked by a TXAS inhibitor and by the transfection of siRNA specific for TXAS. Furthermore, the inhibition of TXAS activity and blockade of the IL-8 receptor attenuated visfatin-induced endothelial angiogenesis. Together, these results showed that visfatin promoted IL-8 production by upregulation of TXAS, leading to angiogenic activation in endothelial cells.
authors.affiliation: Department of Oral Physiology, School of Dentistry, Pusan National University, Yangsan 626-870, South Korea.
authors.forename: Su-Ryun
authors.initials: SR
authors.lastname: Kim
authors.forename: Yun-Hoa
authors.initials: YH
authors.lastname: Jung
authors.forename: Hyun-Joo
authors.initials: HJ
authors.lastname: Park
authors.forename: Mi-Kyoung
authors.initials: MK
authors.lastname: Kim
authors.forename: Joo-Won
authors.initials: JW
authors.lastname: Jeong
authors.forename: Hye-Ock
authors.initials: HO
authors.lastname: Jang
authors.forename: Il
authors.initials: I
authors.lastname: Yun
authors.forename: Soo-Kyung
authors.initials: SK
authors.lastname: Bae
authors.forename: Moon-Kyoung
authors.initials: MK
authors.lastname: Bae
mesh_terms: D045744:Cell Line, Tumor; D004730:Endothelium, Vascular / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D016209:Interleukin-8 / Q000235:genetics*; D018919:Neovascularization, Physiologic / Q000235:genetics*; D054409:Nicotinamide Phosphoribosyltransferase / Q000378:metabolism*; D013928:Thromboxane A2 / Q000096:biosynthesis*; D013930:Thromboxane-A Synthase / Q000235:genetics*; D015854:Up-Regulation
chemical_list: D016209:Interleukin-8; D013928:Thromboxane A2; D054409:Nicotinamide Phosphoribosyltransferase; D013930:Thromboxane-A Synthase