effect of nano-titanium dioxide on limb bud development of NMRI mouse embryo in vivo

ABSTRACT

There is a wide application of titanium dioxide [TiO[2]] nanoparticles [NPs] in industry. These particles are used in various products, and they also has biological effects on cells and organs through direct contact. In this experimental research, the effect of TiO[2] on chondrogenesis of forelimb buds of mice embryos was assessed in in vivo condition. Concentrations of 30, 150 and 500 mg/kg body weight [BW] TiO[2] NPs [20 nm size] dissolved in distilled water were injected intraperitoneally to Naval Medical Research Institute [NMRI] mice on day 11.5 of gestation. On day 15, limb buds were amputated from the embryos and skeletogeneis of limb buds were studied. TiO[2] NPs caused the significant changes in chondrocytes in the following developmental stages resting, proliferating, hypertrophy, degenerating, perichondrium and mesenchymal cells. Decreased number of mesenchymal cells and increased level of chondrocytes were observed after the injection of different concentrations of TiO[2], which proves the unpredictable effects of TiO[2] on limb buds. Results of the present study showed TiO[2] NPs accelerated the chondrogenesis of limb buds, but further studies are recommended to predict TiO[2] toxicity effects on organogenesis