Anti-angiogenic activity of heparin functionalised cerium oxide nanoparticles.
Cerium oxide nanoparticles (nanoceria) are widely reported to be non-cytotoxic and modulate intracellular reactive oxygen species (ROS). In this study, nanoceria (dxRD = 12 nm) were functionalised with either 130 or 880 molecules of unfractionated heparin using the organosilane linker, 3-aminopropyltriethoxysilane. Nanoceria with a low level of heparin functionalisation were found to scavenge intracellular ROS to the same extent as unfunctionalised nanoceria and significantly more than cells exposed to medium only. In contrast, nanoceria with the highest level of heparin functionalisation were not as effective at scavenging intracellular ROS. Nanoceria were localised predominantly in the cytoplasm, while heparin-nanoceria were localised in both the cytoplasm and lysosomes. Together these data demonstrated that the level of nanoceria surface functionalisation with heparin determined the intracellular localisation and ROS scavenging ability of these particles. Additionally, heparin-nanoceria were effective in reducing endothelial cell proliferation indicating that they may find application in the control of angiogenesis in cancer in the future.
Graduate School of Biomedical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia. m.lord@unsw.edu.au
Megan S
MS
Lord
Bonny
B
Tsoi
Cindy
C
Gunawan
Wey Yang
WY
Teoh
Rose
R
Amal
John M
JM
Whitelock
D020533:Angiogenesis Inhibitors / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival; D002563:Cerium / Q000737:chemistry / Q000494:pharmacology*; D042783:Endothelial Cells / Q000187:drug effects / Q000378:metabolism; D006493:Heparin / Q000494:pharmacology*; D006801:Humans; D008247:Lysosomes / Q000187:drug effects / Q000378:metabolism; D053758:Nanoparticles / Q000737:chemistry*; D009389:Neovascularization, Pathologic / Q000188:drug therapy; D011437:Propylamines; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction; D012821:Silanes / Q000737:chemistry
D020533:Angiogenesis Inhibitors; D011437:Propylamines; D017382:Reactive Oxygen Species; D012821:Silanes; D002563:Cerium; C030583:ceric oxide; D006493:Heparin; C477625:amino-propyl-triethoxysilane
Angiogenesis; Cerium oxide; Endothelial cells; Heparin; Nanoparticle; Reactive oxygen species