TOXICOLOGICAL AND HYGIENE CHARACTERIZATION OF SOME METAL-CONTAINING NANOPARTICLES AT VARIOUS EXPOSITION METHODS: BIOACCUMULATION AND MORPHOFUNCTIONAL EXPOSURE FEATURES

Bioaccumulation and morphofunctional disorders induced by metal-containing nanoparticles were investigated on the example of potentially hazardous to health nanodispersed manganese and nickel oxides under various exposition conditions (particles size of 15-29 and 17-45 nanometers respectively). As a comparison, micro dimensional analogs which particles size was 300- to 1300- fold bigger were used. It was established that metalcontaining nanoparticles at intragastric and inhalation exposure had higher penetration power and low removal efficiency from the organism (14- to 39-fold lower); the profile of «critical» organs includes brain, liver, spleen, lungs; metal-containing NPs cause functional disorders in critical systems and target organs (in the form of disrupted balance in indicators of oxidative and antioxidant processes and neurotransmitters under effect of nano dispersed MnO), these disorders having dose-dependent character. A great degree of expressiveness of morphological changes in the blood circulatory system, macrophagal and lymphoid systems, and also the presence of changes in the tissue of liver, brain and heart not revealed under exposition to microdespersed analogs prove a big damaging ability of metal-containing nanoparticles and dependence of expressiveness degree of pathological process on the size of particles.

metal-containing nanoparticles, potential hazard, exposition, experimental study, bioaccumulation, morphofunctional changes