Silver nanoparticles can attenuate nitrative stress.
We have reported previously that glucose availability can modify toxicity of silver nanoparticles (AgNPs) via elevation of antioxidant defence triggered by increased mitochondrial generation of reactive oxygen species. In this study, we examined the effect of glucose availability on the production of reactive nitrogen species in HepG2 cells and modification of nitrative stress by AgNPs. We found that lowering the glucose concentration increased expression of genes coding for inducible nitric oxide syntheas, NOS2 and NOS2A resulting in enhanced production of nitric oxide. Surprisingly, AgNPs decreased the level of nitric oxide accelerated denitration of proteins nitrated by exogenous peroxynitrite in cells grown in the presence of lowered glucose concentration, apparently due to further induction of protective proteins.
Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland. Electronic address: zuberekmariusz@biol.uni.lodz.pl.
Mariusz
M
Zuberek
Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland. Electronic address: paciorekpat@gmail.com.
Patrycja
P
Paciorek
Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland; Department of Biochemistry and Cell Biology, Faculty of Biology and Agriculture, University of Rzeszow, Rejtana 16C, 35-959 Rzeszow, Poland. Electronic address: gbartosz@biol.uni.lodz.p.
Grzegorz
G
Bartosz
Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland. Electronic address: agrzelak@biol.uni.lodz.pl.
Agnieszka
A
Grzelak
D000975:Antioxidants / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism*; D056945:Hep G2 Cells; D006801:Humans; D053768:Metal Nanoparticles / Q000627:therapeutic use; D009569:Nitric Oxide / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II / Q000235:genetics*; D026361:Reactive Nitrogen Species / Q000378:metabolism*; D012834:Silver / Q000378:metabolism / Q000627:therapeutic use
D000975:Antioxidants; D026361:Reactive Nitrogen Species; D009569:Nitric Oxide; D012834:Silver; C496319:NOS2 protein, human; D052247:Nitric Oxide Synthase Type II; D005947:Glucose
Reactive nitrogen species; Reactive oxygen species; Silver nanoparticles