1. Metal accumulation, biochemical and behavioral responses on the Mediterranean clams Ruditapes decussatus exposed to two photocatalyst nanocomposites (TiO2 NPs and AuTiO2NPs)
- Author
-
Olivier Joubert, David Sheehan, Wiem Saidani, Hamouda Beyrem, Mouhamed Dellali, Amine Mezni, Badreddine Sellami, Abdelhafidh Khazri, Institut Jean Lamour (IJL), and Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Gill ,[SDV]Life Sciences [q-bio] ,Health, Toxicology and Mutagenesis ,MESH: Bivalvia ,010501 environmental sciences ,medicine.disease_cause ,01 natural sciences ,chemistry.chemical_compound ,Ruditapes decussatus ,MESH: Behavior, Animal ,Biomonitoring ,MESH: Animals ,0303 health sciences ,MESH: Metal Nanoparticles ,biology ,Chemistry ,Malondialdehyde ,MESH: Water Pollutants, Chemical ,MESH: Titanium ,Catalase ,Environmental chemistry ,Toxicity ,MESH: Gold ,MESH: Hydrogen Peroxide ,animal structures ,AuTiO(2)NPs ,MESH: Malondialdehyde ,Aquatic Science ,Superoxide dismutase ,03 medical and health sciences ,MESH: Catalase ,medicine ,14. Life underwater ,TiO(2) NPs ,MESH: Neurotoxins ,030304 developmental biology ,0105 earth and related environmental sciences ,MESH: Antioxidants ,MESH: Nanocomposites ,MESH: Acetylcholinesterase ,MESH: Catalysis ,MESH: Light ,Bioavailability ,Oxidative stress ,13. Climate action ,MESH: Nitric Oxide ,MESH: Biomarkers ,biology.protein ,MESH: Gastrointestinal Tract ,MESH: Gills ,Biomarkers - Abstract
International audience; Nanoparticle decoration with noble metal represents a promising alternative to improve their photocatalytic and photovoltaic properties. However, toxicity can be influenced by such modification, as the bioavailability of these substances may be influenced. To understand how decoration influences the NP impacts in marine ecosystems, we exposed suspension-feeding clams, Ruditapes decussatus, to two photocatalyst nanocomposites, TiO2 NPs and AuTiO2 NPs, over 2 concentrations, 50 μg L-1and 100 μg L-1, in a laboratory experiment. Accumulation of Au and Ti in gills and digestive gland was noted in clams after exposure to TiO2 NPs and AuTiO2 NPs using inductively coupled plasma optic emission spectroscopy (ICP-OES). TiO2 and AuTiO2 NPs alter the behavior of the clams Ruditapes decussatus by reducing filtration and respiration rates. Furthermore, the highest concentration of TiO2NPs induces an overproduction of H2O2 in gills and digestive gland and NO production only in gills. Superoxide dismutase (SOD), Catalase (CAT), Glutathione-S-transferase (GST) and acetylcholinesterase (AChE) activities were induced in gills and digestives gland in concentration and nanocomposite type dependent manner. Decorated form presented higher Malondialdehyde (MDA) levels in gills and digestive gland than the undecorated form, suggesting different mechanisms of action that may be mediated through oxidative stress. In conclusion, the considered parameters could represent reliable biomarkers for the assessment of NP toxicity on R. decussatus as biological biomonitoring model. In addition, based on the obtained results, nanoparticle decoration influences the toxicity of metal nanoparticles in marine organism.
- Published
- 2019