TiO2 Nanoparticles Induce Dysfunction and Activation of Human Endothelial Cells

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• 作者：Ang茅lica Montiel-D谩valos ; Jos茅 Luis Ventura-Gallegos ; Ernesto Alfaro-Moreno ; Elizabeth Soria-Castro ; Ethel Garc铆a-Latorre ; Jos茅 Gerardo Caba帽as-Moreno ; Mar铆a del Pilar Ramos-Godinez ; Rebeca L贸pez-Marure
• 刊名：Chemical Research in Toxicology
• 出版年：2012
• 出版时间：April 16, 2012
• 年：2012
• 卷：25
• 期：4
• 页码：920-930
• 全文大小：608K
• 年卷期：v.25,no.4(April 16, 2012)
• ISSN：1520-5010

文摘

Nanoparticles can reach the blood and cause inflammation, suggesting that nanoparticles鈥揺ndothelial cells interactions may be pathogenically relevant. We evaluated the effect of titanium dioxide nanoparticles (TiO₂) on proliferation, death, and responses related with inflammatory processes such as monocytic adhesion and expression of adhesion molecules (E- and P-selectins, ICAM-1, VCAM-1, and PECAM-1) and with inflammatory molecules (tissue factor, angiotensin-II, VEGF, and oxidized LDL receptor-1) on human umbilical vein endothelial cells (HUVEC). We also evaluated the production of reactive oxygen species, nitric oxide production, and NF-魏B pathway activation. Aggregates of TiO₂ of 300 nm or smaller and individual nanoparticles internalized into HUVEC inhibited proliferation strongly and induced apoptotic and necrotic death starting at 5 渭g/cmp>2p>. Besides, TiO₂ induced activation of HUVEC through an increase in adhesion and in expression of adhesion molecules and other molecules involved with the inflammatory process. These effects were associated with oxidative stress and NF-魏B pathway activation. In conclusion, TiO₂ induced HUVEC activation, inhibition of cell proliferation with increased cell death, and oxidative stress.