title: Effects of Fluid Shear Stress on Expression of Smac/DIABLO in Human Umbilical Vein Endothelial Cells.
abstract: OBJECTIVE
  To investigate the molecular mechanisms of laminar shear stress on inhibition of apoptosis in endothelial cells, human umbilical vein endothelial cells (HUVECs) were starved in medium containing 2% fetal bovine serum and 20 dyne/cm(2) shear stress.
  
  
  METHODS
  HUVECs were subjected to shear stress or incubated in a static condition and then Smac/DIABLO expression was quantified by reverse-transcription polymerase chain reaction, real-time PCR, and western blot. The effect of shear stress on the migration of Smac/DIABLO proteins was detected by immunofluorescence microscopy.
  
  
  RESULTS
  Results demonstrated that 20 dyne/cm(2) shear stress inhibited the expression of Smac/DIABLO at both the mRNA and protein levels in cultured HUVECs. Furthermore, release of Smac/DIABLO from mitochondria was induced by removal of basic fibroblast growth factor and decrease of fetal bovine serum in the medium, whereas shear stress inhibited its release under the same conditions.
  
  
  CONCLUSIONS
  These results suggest that down-regulation of Smac/DIABLO may contribute to the potent antiatherosclerotic effect of shear stress by preventing endothelial cells from entering apoptosis.
authors.affiliation: Department of Pharmacology, School of Medicine, Xiamen University, Xiamen, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Department of Pharmacology, School of Medicine, Xiamen University, Xiamen, China.
authors.forename: Le
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Pharmacology, School of Medicine, Xiamen University, Xiamen, China.
authors.forename: Liang-Liang
authors.initials: LL
authors.lastname: Sun
authors.affiliation: Department of Pharmacology, School of Medicine, Xiamen University, Xiamen, China.
authors.forename: Xiang-Lan
authors.initials: XL
authors.lastname: Meng
authors.affiliation: Department of Pharmacology, School of Medicine, Xiamen University, Xiamen, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Department of Pharmacology, School of Medicine, Xiamen University, Xiamen, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Jin
keywords: Smac/DIABLO; apoptosis; atherosclerosis; human umbilical vein endothelial cells; shear stress