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Biocompatibility evaluation of CeO2 nanoparticles to be employed as nanodrugs i...
Fernández-Bertólez, Natália; Touzani, Assia; Martínez, L.; Reis, Ana Teresa; Fraga, Sónia; Teixeira, João Paulo; Costa, Carla; Pásaro, EduardoCerium dioxide nanoparticles (CeO2NP) have recently gained attention for their unique structure-dependent properties, antioxidant enzyme-like behaviour, ROS scavenging activity and great potential for biomedical applications. In addition to their antioxidant and anti-inflammatory activity, CeO2NP are also known to exhibit anticancer potential, providing an attractive opportunity for use in cancer therapy, as a ...
Neuron and Glial Cells Exposed to Cerium Dioxide Nanoparticles: Results from MT...
Fernández-Bertólez, Natalia; Touzani, Assia; Martínez, Luisa; Méndez, Josefina; Reis, Ana Teresa; Costa, Carla; Fraga, Sonia; Teixeira, João PauloCerium dioxide nanoparticles (CeO2NP) show antioxidant enzyme-like properties and reactive oxygen species (ROS) scavenging activity, making them a promising material for potential therapeutic applications in neurodegenerative diseases. The objective of this work was to assess the biological behavior of CeO2NP in human SH-SY5Y neuronal and A172 glial cells by means of the MTT assay and the γH2AX assay. Despite t...
Toxicological Aspects of Iron Oxide Nanoparticles
Fernández-Bertólez, Natalia; Costa, Carla; Brandão, Fátima; Teixeira, João Paulo; Pásaro, Eduardo; Valdiglesias, Vanessa; Laffon, BlancaIron oxide nanoparticles (ION), with unique magnetic properties, have attracted huge scientific attention for a wide variety of uses, mostly in the biomedical field, due to their high biocompatibility, ability to cross biological membranes, appropriate surface architecture and easy conjugation with targeting ligands. Their current applications include diagnostic imaging, cell labelling, site-directed drug deliv...
Suitability of salivary leucocytes to assess DNA repair ability in human biomon...
Fernández-Bertólez, Natalia; Lema-Arranz, Carlota; Fraga, Sónia; Teixeira, João Paulo; Pásaro, Eduardo; Lorenzo-López, Laura; Valdiglesias, VanessaThe challenge-comet assay is a simple but effective approach that provides a quantitative and functional determination of DNA repair ability, and allows to monitor the kinetics of repair process. Peripheral blood mononuclear cells (PBMC) are the cells most frequently employed in human biomonitoring studies using the challenge-comet assay, but having a validated alternative of non-invasive biomatrix would be hig...
Relationship between DNA damage measured by the comet-assay and cognitive function
Lorenzo-López, Laura; Lema-Arranz, Carlota; Fernández-Bertólez, Natalia; Costa, Solange; Costa, Carla; Teixeira, João Paulo; Pásaro, EduardoRecent studies exploring the relationship between DNA damage measured by the comet assay (single-cell gel electrophoresis) and cognitive function in both animal models and humans are reviewed and summarized. This manuscript provides an overview of studies exploring cognitive dysfunction related to DNA damage due to biological ageing process, cancer treatment, adverse environmental or occupational exposures, and...
Salivary Leucocytes as In Vitro Model to Evaluate Nanoparticle-Induced DNA Damage
Valdiglesias, Vanessa; Fernández-Bertólez, Natalia; Lema-Arranz, Carlota; Rodríguez-Fernández, Raquel; Pásaro, Eduardo; Reis, Ana TeresaMetal oxide nanoparticles (NPs) have a wide variety of applications in many consumer products and biomedical practices. As a result, human exposure to these nanomaterials is highly frequent, becoming an issue of concern to public health. Recently, human salivary leucocytes have been proposed as an adequate non-invasive alternative to peripheral blood leucocytes to evaluate genotoxicity in vitro. The present stu...
Suitability of the In Vitro Cytokinesis-Block Micronucleus Test for Genotoxicit...
Fernández-Bertólez, Natalia; Brandão, Fátima; Costa, Carla; Pásaro, Eduardo; Teixeira, João Paulo; Laffon, Blanca; Valdiglesias, VanessaStandard toxicity tests might not be fully adequate for evaluating nanomaterials since their unique features are also responsible for unexpected interactions. The in vitro cytokinesis-block micronucleus (CBMN) test is recommended for genotoxicity testing, but cytochalasin-B (Cyt-B) may interfere with nanoparticles (NP), leading to inaccurate results. Our objective was to determine whether Cyt-B could interfere ...
Genotoxicity of TiO2 Nanoparticles in Four Different Human Cell Lines (A549, HE...
Brandão, Fátima; Fernández-Bertólez, Natalia; Rosário, Fernanda; Bessa, Maria João; Fraga, Sónia; Pásaro, Eduardo; Teixeira, João Paulo; Laffon, BlancaTitanium dioxide nanoparticles (TiO2 NPs) have a wide variety of applications in many consumer products, including as food additives, increasing the concern about the possible hazards that TiO2 NPs may pose to human health. Although most previous studies have focused on the respiratory system, ingestion must also be considered as an important exposure route. Furthermore, after inhalation or ingestion, TiO2 NPs ...
Assessment of genotoxic effects of titanium dioxide nanoparticles on different ...
Fernández-Bertólez, Natalia; Brandao, Fátima; Rosário, Fernanda; Bessa, Maria João; Fraga, Sónia; Pásaro, Eduardo; Teixeira, Joao Paulo; Costa, CarlaThe main objective of the present work was to assess the cellular uptake and potential genotoxicity (micronuclei induction) of TiO2 NPs on four diverse human cell lines.
Association of inflammatory mediators with frailty status in older adults: resu...
Marcos-Pérez, Diego; Sánchez-Flores, María; Proietti, Stefania; Bonassi, Stefano; Costa, Solange; Teixeira, Joao Paulo; Fernández-Tajes, JuanFrailty is a geriatric syndrome defined as a status of extreme vulnerability to stressors, leading to a higher risk of negative health-related outcomes. "Inflammaging", an age-related state of low-grade chronic inflammation, is characterized by an increased concentration of pro-inflammatory cytokines and acute phase proteins. Inflammaging has been postulated as an underlying mechanism of frailty, and several st...