Differential responsiveness of early- and late-passage endothelial cells to shear stress

Fabio A. Kudo, Bohdan Warycha, Peter J. Juran, Hidenori Asada, Desarom Teso, Faisal Aziz, Jared Frattini, Bauer E. Sumpio, Toshiya Nishibe, Charles Cha, Alan Dardik

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Background: The incidence of vascular disease increases with age. Because atherosclerosis and neointimal hyperplasia colocalize in areas of disturbed shear stress, the effects of orbital shear stress (SS) on endothelial cell proliferation, protein kinase B (Akt) activation, and functional activity were analyzed using a senescence model. Methods: Early- (p3 to 7) and late- (p28 to 32) passage bovine aortic endothelial cells were exposed to orbital SS (210 rpm) or static conditions (0 to 5 days). Cell proliferation was directly counted and confirmed with proliferating cell nuclear antigen reactivity. Phosphorylated and total Akt were assessed with Western blotting. Endothelial cell-induced smooth muscle cell migration was assessed with a Boyden chamber. Results: Late-passage endothelial cells demonstrated no increase in orbital SS stimulated proliferation compared with early-passage cells (P = .42). Late-passage endothelial cells demonstrated decreased Akt phosphorylation in response to SS compared with early passage cells (n = 6, P = .01). Late-passage cells induced 26% less smooth muscle cell migration than early-passage cells (n = 3, P = .03). Conclusions: Late-passage endothelial cells demonstrate decreased proliferation, Akt phosphorylation, and secretion of smooth muscle cell chemoattractants in response to orbital SS compared with early passage cells. These results suggest that late-passage endothelial cells respond to SS differently than early-passage cells and confirm the utility of the in vitro senescence model.

Original languageEnglish (US)
Pages (from-to)763-769
Number of pages7
JournalAmerican Journal of Surgery
Volume190
Issue number5
DOIs
StatePublished - Nov 2005

All Science Journal Classification (ASJC) codes

  • Surgery

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