title: Insights into the cellular response triggered by silver nanoparticles using quantitative proteomics.
abstract: The use of nanoparticles in foods, materials, and clinical treatments has increased dramatically in the past decade. Because of the possibility of human exposure to nanoparticles, there is an urgent need to investigate the molecular mechanisms underlying the cellular responses that might be triggered. Such information is necessary to assess potential health risks arising from the use of nanoparticles, and for developing new formulations of next generation nanoparticles for clinical treatments. Using mass spectrometry-based proteomic technologies and complementary techniques (e.g., Western blotting and confocal laser scanning microscopy), we present insights into the silver nanoparticle-protein interaction in the human LoVo cell line. Our data indicate that some unique cellular processes are driven by the size. The 100 nm nanoparticles exerted indirect effects via serine/threonine protein kinase (PAK), mitogen-activated protein kinase (MAPK), and phosphatase 2A pathways, and the 20 nm nanoparticles induced direct effects on cellular stress, including generation of reactive oxygen species and protein carbonylation. In addition, we report that proteins involved in SUMOylation were up-regulated after exposure to 20 nm silver nanoparticles. These results were further substantiated by the observation of silver nanoparticles entering the cells; however, data indicate that this was determined by the size of the nanoparticles, since 20 nm particles entered the cells while 100 nm particles did not.
authors: Protein Research Group and §MEMPHYS Center for Biomembrane Physics, Department of Biochemistry and Molecular Biology, University of Southern Denmark , Odense, DK-5230, Denmark.
authors: Thiago
authors: T
authors: Verano-Braga
authors: Rona
authors: R
authors: Miethling-Graff
authors: Katarzyna
authors: K
authors: Wojdyla
authors: Adelina
authors: A
authors: Rogowska-Wrzesinska
authors: Jonathan R
authors: JR
authors: Brewer
authors: Helmut
authors: H
authors: Erdmann
authors: Frank
authors: F
authors: Kjeldsen
mesh_terms: D001692:Biological Transport; D002460:Cell Line; D003603:Cytotoxins / Q000737:chemistry* / Q000378:metabolism / Q000633:toxicity*; D006801:Humans; D053768:Metal Nanoparticles / Q000633:toxicity*; D018384:Oxidative Stress / Q000187:drug effects; D010316:Particle Size; D040901:Proteomics; D012834:Silver / Q000737:chemistry* / Q000378:metabolism / Q000633:toxicity*
chemical_list: D003603:Cytotoxins; D012834:Silver