title: Effects of fluid shear stress on expression of proto-oncogenes c-fos and c-myc in cultured human umbilical vein endothelial cells.
abstract: The objective of our research was to reveal the effects of different shear stresses on the expression of proto-oncogenes c-fos and c-myc in cultured human umbilical vein endothelial cells (HUVEC). A parallel plate flow chamber was used to control the value and duration of shear stress (SS), and the expression of c-fos and c-myc protein was measured by immunocytochemistry methods and image analysis software. Some important conclusions were drawn. In the stationary state, c-fos protein levels were very low. The SS's of 4 dyn/cm(2) and 10 dyn/cm(2) induced rapid increases of c-fos protein levels, especially the SS of 10 dyn/cm(2). The levels peaked at 1.0 h. Then, c-fos protein levels began to decrease, after 2.5 h, they declined to almost basal levels. In the stationary state, the c-myc protein levels were also very low slowly increasing after the onset of shear stress. The effects of 4 dyn/cm(2) and 10 dyn/cm(2) SS on c-myc protein expression levels had no difference and apparently were less than the effect on c-fos protein levels. The c-myc protein levels peaked at 1.5 h. Subsequently, they fell to basal levels at 2.5 h. Increased expression of these proto-oncogenes mediated by shear stress may have important effects on the regulation of critical cell activities, such as proliferation and differentiation.
authors.affiliation: Biomechanics & Medical Information Institute, Beijing Polytechnic University, Beijing, 100022, China.
authors.forename: Caixia
authors.initials: C
authors.lastname: Li
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Zeng
authors.forename: Jinlin
authors.initials: J
authors.lastname: Hu
authors.forename: Hongmei
authors.initials: H
authors.lastname: Yu
mesh_terms: D001775:Blood Circulation / Q000502:physiology*; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007150:Immunohistochemistry; D007700:Kinetics; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism*; D016271:Proto-Oncogene Proteins c-myc / Q000378:metabolism*; D013314:Stress, Mechanical; D014471:Umbilical Veins / Q000166:cytology
chemical_list: D016760:Proto-Oncogene Proteins c-fos; D016271:Proto-Oncogene Proteins c-myc