RRC ID 37484
Author Hashimoto M, Sasaki JI, Yamaguchi S, Kawai K, Kawakami H, Iwasaki Y, Imazato S.
Title Gold Nanoparticles Inhibit Matrix Metalloproteases without Cytotoxicity.
Journal J. Dent. Res.
Abstract Nanoparticles (NPs) are currently the focus of considerable attention for dental applications; however, their biological effects have not been fully elucidated. The long-term, slow release of matrix metalloproteases (MMPs) digests collagen fibrils within resin-dentin bonds. Therefore, MMP inhibitors can prolong the durability of resin-dentin bonds. However, there have been few reports evaluating the combined effect of MMP inhibition and the cytotoxic effects of NPs for dentin bonding. The aim of this study was to evaluate MMP inhibition and cytotoxic responses to gold (AuNPs) and platinum nanoparticles (PtNPs) stabilized by polyvinylpyrrolidone (PVP) in cultured murine macrophages (RAW264) by using MMP inhibition assays, measuring cell viability and inflammatory responses (quantitative reverse transcription polymerase chain reaction [RT-qPCR]), and conducting a micromorphological analysis by fluorescence and transmission electron microscopy. Cultured RAW264 cells were exposed to metal NPs at various concentrations (1, 10, 100, and 400 µg/mL). AuNPs and PtNPs markedly inhibited MMP-8 and MMP-9 activity. Although PtNPs were cytotoxic at high concentrations (100 and 400 µg/mL), no cytotoxic effects were observed for AuNPs at any concentration. Transmission electron microscopy images showed a significant nonrandom intercellular distribution for AuNPs and PtNPs, which were mostly observed to be localized in lysosomes but not in the nucleus. RT-qPCR analysis demonstrated inflammatory responses were not induced in RAW264 cells by AuNPs or PtNPs. The cytotoxicity of nanoparticles might depend on the core metal composition and arise from a "Trojan horse" effect; thus, MMP inhibition could be attributed to the surface charge of PVP, which forms the outer coating of NPs. The negative charge of the surface coating of PVP binds to Zn(2+) from the active center of MMPs by chelate binding and results in MMP inhibition. In summary, AuNPs are attractive NPs that effectively inhibit MMP activity without cytotoxicity or inflammatory responses.
Volume 94(8)
Pages 1085-91
Published 2015-8
DOI 10.1177/0022034515589282
PII 0022034515589282
PMID 26040283
MeSH Animals Cell Survival / drug effects Gold / chemistry* Gold / toxicity* Humans Immunohistochemistry Macrophages / drug effects* Matrix Metalloproteinase Inhibitors / chemistry* Matrix Metalloproteinase Inhibitors / toxicity* Mice Microscopy, Electron, Transmission Microscopy, Fluorescence Nanoparticles / chemistry* Nanoparticles / toxicity* Platinum / chemistry Platinum / toxicity Povidone / chemistry Povidone / toxicity Reverse Transcriptase Polymerase Chain Reaction
IF 5.125
Times Cited 6
Human and Animal Cells RAW 264(RCB0535)