RRC ID 43813
Author Xu L, Li X, Takemura T, Hanagata N, Wu G, Chou LL.
Title Genotoxicity and molecular response of silver nanoparticle (NP)-based hydrogel.
Journal J Nanobiotechnology
Abstract BACKGROUND:Since silver-nanoparticles (NPs) possess an antibacterial activity, they were commonly used in medical products and devices, food storage materials, cosmetics, various health care products, and industrial products. Various silver-NP based medical devices are available for clinical uses, such as silver-NP based dressing and silver-NP based hydrogel (silver-NP-hydrogel) for medical applications. Although the previous data have suggested silver-NPs induced toxicity in vivo and in vitro, there is lack information about the mechanisms of biological response and potential toxicity of silver-NP-hydrogel.
METHODS:In this study, the genotoxicity of silver-NP-hydrogel was assayed using cytokinesis-block micronucleus (CBMN). The molecular response was studied using DNA microarray and GO pathway analysis.
RESULTS AND DISCUSSION:The results of global gene expression analysis in HeLa cells showed that thousands of genes were up- or down-regulated at 48 h of silver-NP-hydrogel exposure. Further GO pathway analysis suggested that fourteen theoretical activating signaling pathways were attributed to up-regulated genes; and three signal pathways were attributed to down-regulated genes. It was discussed that the cells protect themselves against silver NP-mediated toxicity through up-regulating metallothionein genes and anti-oxidative stress genes. The changes in DNA damage, apoptosis and mitosis pathway were closely related to silver-NP-induced cytotoxicity and chromosome damage. The down-regulation of CDC14A via mitosis pathway might play a role in potential genotoxicity induced by silver-NPs.
CONCLUSIONS:The silver-NP-hydrogel induced micronuclei formation in cellular level and broad spectrum molecular responses in gene expression level. The results of signal pathway analysis suggested that the balances between anti-ROS response and DNA damage, chromosome instability, mitosis inhibition might play important roles in silver-NP induced toxicity. The inflammatory factors were likely involved in silver-NP-hydrogel complex-induced toxic effects via JAK-STAT signal transduction pathway and immune response pathway. These biological responses eventually decide the future of the cells, survival or apoptosis.
Volume 10
Pages 16
Published 2012-5-1
DOI 10.1186/1477-3155-10-16
PII 1477-3155-10-16
PMID 22548743
PMC PMC3430588
MeSH Cell Shape / drug effects Down-Regulation / drug effects Down-Regulation / genetics Gene Expression Profiling Gene Expression Regulation, Neoplastic / drug effects HeLa Cells Humans Hydrogel, Polyethylene Glycol Dimethacrylate / toxicity* Metal Nanoparticles / toxicity* Metal Nanoparticles / ultrastructure Micronucleus Tests Models, Biological Mutagenicity Tests Mutagens / toxicity* Oligonucleotide Array Sequence Analysis Real-Time Polymerase Chain Reaction Reproducibility of Results Silver / toxicity* Up-Regulation / drug effects Up-Regulation / genetics
IF 5.345
Times Cited 80
Human and Animal Cells