Alleva R.,Rizzoli Orthopaedic Institute |
Borghi B.,Rizzoli Orthopaedic Institute |
Santarelli L.,Marche Polytechnic University |
Strafella E.,Marche Polytechnic University |
And 4 more authors.
Toxicology in Vitro | Year: 2011
Aspartame (APM) is the most widely used artificial sweetener and is added to a wide variety of foods, beverages, drugs, and hygiene products. In vitro and in vivo tests have reported contradictory data about APM genotoxicity. We evaluated the angiogenic effect of APM in an in vitro model using blood vessel development assay (Angio-Kit), cultured endothelial cells and fibroblasts. The release of IL-6, VEGF-A, and their soluble receptors sIL-R6 and sVEGFR-2 were determined over time in the conditioned medium of the Angio-Kit system, endothelial cells and cell lines with fibroblast properties after APM treatment. Reactive oxygen species (ROS) formation, cell viability, and stimulation of the extracellular signal-regulated kinases (erk1/2) and protein p38 were also evaluated. Exposure to APM induced blood vessel formation. ROS production was observed in endothelial cells after APM treatment, which was associated with a slight cell cytotoxicity. Neither intracellular ROS formation nor cell death was observed in fibroblasts. APM increases the levels of inflammatory mediator IL-6, VEGF and their soluble receptors released from endothelial cells into the medium. APM treatment induces VEGF-pathway activation by erk1/2 and p38 phosphorylation. APM at low doses is an angiogenic agent that induces regenerative cytokine production leading to the activation of MAPKs and resulting in the formation of new blood vessels. © 2010 Elsevier Ltd.
Protano C.,University of Rome La Sapienza |
Guidotti M.,U.S. Environmental Protection Agency |
Manini P.,University of Parma |
Petyx M.,National Institute for Occupational Safety and Prevention |
And 2 more authors.
Environment International | Year: 2010
Benzene is a widespread air pollutant and a well-known human carcinogen. Evidence is needed regarding benzene intake in the pediatric age group. We investigated the use of urinary (u) trans,trans-muconic acid (t,t-MA), S-phenylmercapturic acid (SPMA), and unmodified benzene (UB) for assessing exposure to low concentrations of environmental benzene and the role of living environment on benzene exposure in childhood.u-t,t-MA, u-SPMA, u-UB and u-cotinine were measured in urine samples of 243 Italian children (5-11. years) recruited in a cross-sectional study. Analytical results were compared with data obtained from questionnaires about participants' main potential exposure factors.u-UB, u-t,t-MA and u-SPMA concentrations were about 1.5-fold higher in children living in urban areas than in those in the rural group. Univariate analyses showed that u-UB was the only biomarker able to discriminate secondhand smoke (SHS) exposure in urban and rural children (medians. =411.50 and 210.50. ng/L, respectively); these results were confirmed by the strong correlation between u-UB and u-cotinine in the SHS-exposed group and by multivariate analyses. A regression model on u-SPMA showed that the metabolite is related to residence area (p<0.001), SHS exposure (p=0.048) and gender (p=0.027).u-UB is the best marker of benzene exposure in children in the present study, and it can be used as a good carcinogen-derived biomarker of exposure to passive smoking, especially related to benzene, when urine sample is collected at the end of the day. In addition, it is important to highlight that SHS resulted the most important contributor to benzene exposure, underlining the need for an information campaign against passive smoking exposure. © 2010 Elsevier Ltd.
Gherardi M.,National Institute for Occupational Safety and Prevention |
Gordiani A.,National Institute for Occupational Safety and Prevention |
Gatto M.,National Institute for Occupational Safety and Prevention
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2010
The aim of this study was to develop an analytical method to monitor the saliva matrix for ototoxic solvents absorption: the method is based on headspace gas chromatography/mass spectrometry and represents an alternative biological monitoring for investigating low exposure to hazardous ototoxic solvents. Simultaneous determination of toluene, ethylbenzene, xylenes and styrene has been carried out and the method has been optimized for both instrumental parameters and samples treatment. Chromatographic conditions have been set in order to obtain a good separation of xylene isomers due to the interest in p-xylene as ototoxic one. Method validation has been performed on standards spiked in blank saliva by using two internal standards (2-fluorotoluene and deuterated styrene-d8). This method showed the possibility to detect the target compounds with a linear dynamic range of at least a 2 orders of magnitude characterized by a linear determination coefficient (r2) greater than 0.999. The limit of detection (LOD) ranged between 0.19ng/mL (styrene) and 0.54ng/mL (m-xylene) and the lower limit of quantification (LLOQ) ranged between 0.64ng/mL (styrene) and 1.8ng/mL (m-xylene). The method achieved good accuracy (from 99 to 105%) and precision for both intra- and inter-assay (relative standard deviation ranging from 1.7 to 13.8%) for all six compounds concerned. The repeatability was improved by adding sodium sulphate to the matrix. Saliva samples resulted stable for at least 7 days after collection, if stored in headspace vials, at the temperature of 4°C. An evaluation of the main sources of uncertainty of the method is also included: expanded uncertainties ranges between 10 and 16% for all of the target compounds. In summary, the headspace gas chromatography/mass spectrometry method is a highly sensitive, versatile and flexible technique for the biological monitoring of exposure to ototoxic solvents by saliva analysis. © 2010.