<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Borcherding, Jennifer</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Chen, Haihan</style></author><author><style face="normal" font="default" size="100%">Stebounova, Larissa</style></author><author><style face="normal" font="default" size="100%">Wu, Chia-Ming</style></author><author><style face="normal" font="default" size="100%">Rubasinghege, Gayan</style></author><author><style face="normal" font="default" size="100%">Mudunkotuwa, Imali A.</style></author><author><style face="normal" font="default" size="100%">Caraballo, Juan Carlos</style></author><author><style face="normal" font="default" size="100%">Zabner, Joseph</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author><author><style face="normal" font="default" size="100%">Comellas, Alejandro P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Iron oxide nanoparticles induce Pseudomonas aeruginosa growth, induce biofilm formation, and inhibit antimicrobial peptide function.</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental Science: Nano</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Pseudomonas iron oxide nanoparticle biofilm antimicrobial peptide</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">Royal Society of Chemistry</style></publisher><volume><style face="normal" font="default" size="100%">1</style></volume><pages><style face="normal" font="default" size="100%">123 - 132</style></pages><isbn><style face="normal" font="default" size="100%">2051-8161</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Given the increased use of iron-contg. nanoparticles in a no. of applications, it is important to understand any effects that iron-contg. nanoparticles can have on the environment and human health.  Since iron concns. are extremely low in body fluids, there is potential that iron-contg. nanoparticles may influence the ability of bacteria to scavenge iron for growth, affect virulence and inhibit antimicrobial peptide (AMP) function.  In this study, Pseudomonas aeruginosa (PA01) and AMPs were exposed to iron oxide nanoparticles, hematite (α-Fe2O3), of different sizes ranging from 2 to 540 nm (2 ± 1, 43 ± 6, 85 ± 25 and 540 ± 90 nm) in diam.  Here we show that the greatest effect on bacterial growth, biofilm formation, and AMP function impairment is found when exposed to the smallest particles.  These results are attributed in large part to enhanced dissoln. obsd. for the smallest particles and an increase in the amt. of bioavailable iron.  Furthermore, AMP function can be addnl. impaired by adsorption onto nanoparticle surfaces.  In particular, lysozyme readily adsorbs onto the nanoparticle surface which can lead to loss of peptide activity.  Thus, this current study shows that co-exposure of nanoparticles and known pathogens can impact host innate immunity.  Therefore, it is important that future studies be designed to further understand these types of impacts. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2014:465811(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Borcherding, Jennifer A.</style></author><author><style face="normal" font="default" size="100%">Chen, Haihan</style></author><author><style face="normal" font="default" size="100%">Caraballo, Juan C.</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Pezzulo, Alejandro A.</style></author><author><style face="normal" font="default" size="100%">Zabner, Joseph</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author><author><style face="normal" font="default" size="100%">Comellas, Alejandro P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Coal fly ash impairs airway antimicrobial peptides and increases bacterial growth.</style></title><secondary-title><style face="normal" font="default" size="100%">PLoS One</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">Public Library of Science</style></publisher><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">e57673</style></pages><isbn><style face="normal" font="default" size="100%">1932-6203</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Air pollution is a risk factor for respiratory infections, and one of its main components is particulate matter (PM), which is comprised of a no. of particles that contain iron, such as coal fly ash (CFA).  Since free iron concns. are extremely low in airway surface liq. (ASL), we hypothesize that CFA impairs antimicrobial peptides (AMP) function and can be a source of iron to bacteria.  We tested this hypothesis in vivo by instilling mice with Pseudomonas aeruginosa (PA01) and CFA and det. the percentage of bacterial clearance.  In addn., we tested bacterial clearance in cell culture by exposing primary human airway epithelial cells to PA01 and CFA and detg. the AMP activity and bacterial growth in vitro.  We report that CFA is a bioavailable source of iron for bacteria.  We show that CFA interferes with bacterial clearance in vivo and in primary human airway epithelial cultures.  Also, we demonstrate that CFA inhibits AMP activity in vitro, which we propose as a mechanism of our cell culture and in vivo results.  Furthermore, PA01 uses CFA as an iron source with a direct correlation between CFA iron dissoln. and bacterial growth.  CFA concns. used are very relevant to human daily exposures, thus posing a potential public health risk for susceptible subjects.  Although CFA provides a source of bioavailable iron for bacteria, not all CFA particles have the same biol. effects, and their propensity for iron dissoln. is an important factor.  CFA impairs lung innate immune mechanisms of bacterial clearance, specifically AMP activity.  We expect that identifying the PM mechanisms of respiratory infections will translate into public health policies aimed at controlling, not only concn. of PM exposure, but physicochem. characteristics that will potentially cause respiratory infections in susceptible individuals and populations. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2013:396251(Journal; Online Computer File)</style></notes></record></records></xml>