Investigating the Protective Role of N-Acetyl Cysteine and S-Methyl Cysteine in the Activity of Antioxidant Enzymes and the Level of lipid Peroxidation Due to Acetamiprid Administration in Rat Kidney and Serum

Background & Objective: Acetamiprid (ACP), as a neonicotinoid toxin, causes free radicals production and oxidative stress in various organisms. The aim of this study was to evaluate the antioxidative effects of N-acetylcysteine (NAC) and S-methylcysteine (SMC) on reducing acetaminoprid-induced oxidative stress in serum and kidney of rats. Materials & Methods: In this experimental study, 42 male Wistar rats were randomly divided into 6 groups of 7 including one control, one sham (normal saline) and five experimental groups, which intra-peritoneally received ACP (5 mg/kg), NAG (160 mg/kg), SMC (100 mg/kg), ACP+NAC, ACP+SMC, and ACP+ NAC+SMC for one week. After separation of serum and kidney tissue, the activity of the catalase (CAT), glutathione S-transferase (GST), glutathione concentration (GSH), malondialdehyde (MDA) and total antioxidant (TAC) was determined. Results: Acetamiprid caused significant increase in GST activity in serum and kidney (p< 0.01), CAT activity in serum and kidney (p< 0.05) but insignificant increase in MDA level and insignificant decrease in GSH and TAC compared to control. NAC and SMC, alone and in combination with ACP, restored the levels of TAC, GSH and MDA and activities of CAT and GST. Conclusion: Acetamiprid increases lipid peroxidation, activity of CAT and GST, and decreases the concentration of GSH and TAC, presumably by producing free radicals. Administration of NAC and SMS as antioxidants causes a decrease in acetamiprid toxicity due to relative reduction of free radicals

Histopathological Evaluation of the Embryo and Weight Assessment of Body, Kidney, and Liver in Pregnant NMRI Mice Exposed to Zinc Oxide (ZnO)Nanoparticles

Background & Objective: Zinc is an essential trace element which plays a key role in the growth and the development of the embryo during pregnancy. This study was designed to investigate the cytotoxic effects of zinc oxide nanoparticles on embryonic development and to assess the weight of body, kidney, and liver in Naval Medical Research Institute (NMRI) mice.  Materials & Methods: 25 female of NMRI mice weighting 30±3.0 gram were randomly divided into five groups (five in each group, four experimental groups and one control group). Mice in experimental groups one, two, three, and four received intraperitoneal ZnO nanoparticle with the concentrations of 50,100,150, and 200 mg / kg, respectively during 15 days (every other day). At the end, the weight of the body, the kidney, and the liver of the pregnant mice and the embryos were measured. In addition, histopathological evaluations were performed on embryos. The data were analyzed by SAS software in P≤0.05.  Results: Based on the macroscopic observations, the embryo and the kidney weights decreased and increased, respectively with increasing different concentrations of nanoparticle compared with controls (P≤0.05). Our data showed that at different concentrations of nanoparticles, the distance, the size, and the number of vertebral bodies increased compared to the control group. At the concentration of 150 mg/kg, an accumulation of mesenchymal cells for cartilage were observed and it seems that high dose of nanoparticles prevents embryo growth.Conclusion: The results of this study indicate that ZnO nanoparticles cause embryonic developmental delay, undifferentiated and disorganized vertebral bodies in NMRI mice

Investigation of the Enzyme activities of Alkaline Phosphatase, Lactate Dehydrogenase, Transaminase and Histopathological Changes of Liver after Exposure to NiO and NiO Nanoparticles in Rats

Introduction: Nickel (Ni) and nickel compounds are widely used in industry, radiotherapy and nanomedicine. However, the toxicity of NiO nanoparticles is yet to be fully elucidated. In this study, we evaluated the toxicity of NiO and NiO nanoparticles (NiONPs) using basic medical diagnostic tools, such as biochemical tests and histopathological changes of liver in rats. Methods: In this experimental study, 49 male rats were divided randomly into seven groups (n=7), including one control group and six experimental groups (three experimental groups received NiONPs and three experimental groups received NiO intraperitoneally) with doses of 10, 25 and 50 mg/kg for 8 days. After 8 days, blood samples were collected from heart and liver enzyme activity assay was performed on serum sample. Livert issue for histopathological evaluation were stained with hematoxylin and eosin. Data were analyzed using ANOVA and Tukey test with SPSS21 software at significant level of P<0.05. Results:The results showed that enzyme activity of AST, ALT, ALP and LDH in different doses NiO NPs and NiO increased in compared to control group (p<0.05). Histopathological study of liver following intraperitoneal (IP) administration of NiONPs and NiO showed pathological changes, including congestion, Cirrhosis and inflammatory cell infiltration compared to control group. Conclusion: The results of this study demonstrate that exposure to different doses of NiONPs and NiO can induce different degrees of damage in a dose dependent manner. Thus, increasing level of liver enzymes and histopathological changes confirmed NiONPs and NiO toxicity

Toxicity Properties of Silver Nanoparticles on Lactate Dehydrogenase Activity and Histological Changes of Heart and Embryo Tissues in Pregnant Mice (NMRI)

The rapid advancement of nanotechnology enables us to use nanoscale particles. This material in terms of physical, chemical and biological characteristics are unique compared to larger particles. Increased cell division, apoptosis, oxidative stress has been associated with toxic effects of nano-silver. The aim of this study was to evaluate histipotological changes and enzyme activity in nanoparticle silver trated pregnant NMRI mice. These experimental were performed on 35 NMRI mice used for treatment with Ag Nps. The average weight of the animals was 30 ± 3 g that divided into five groups of seven were injected intraperitoneally. After mentioned treatment, the blood sampling was done of NMRI. The collected tissues were washed with saline and fixed in Boin΄s fluid and stained with hematoxylin and eosin for histopathology evaluation. After data collection, statistical analysis was done using SAS software. Histological observations showed that the silver nanoparticles had a major effect on fetal development in each experimental groups compared to the control group. No change of histological characteristics of heart tissues was observed in Ag-nps groups as compared to the control group. Different concentrations of silver nanoparticles increased levels of enzyme lactate dehydrogenase , but no significant differences were observed between control and treated groups (P&lt;0.05). Toxicity of silver nanoparticles injected intraperitoneally into the experimental groups were evaluated which had unfavorable effects on embryonic development. So, further investigates are suggested to predict AgNPs toxicity. </em

Cytotoxic assessment of silver nanoparticles in embryonic development and kidney tissue in pregnant mice

Background and Aim: Regarding the widespread use of silver nanoparticles in medecine and lack of a detailed study of toxicity effects of these particles on fetus, this study was carried out to investigate histopathological changes of the kidneys and also embryonic development following exposure to silver nanoparticles. Materials and Methods: In this experimental study, thirty five female NMRI mice were randomly divided into five equal groups i.e. one control group and four experimental groups. The experimental groups intraperitoneally (IP) received silver nanoparticles at concentrations of 50, 100, 200 and 400 mg/ kg . .every other day. On the 17th day  of pregnancy, the mice were dissected and  their kidneys and embryos tissues were separated and stained with hematoxylin and eosin for histopathological examinations. .Finally, the obtained data was fed into SPSS software (V:16) using statistical tests including Kolmogrof-Smearnof, one-way variance analysis, Dante, Mann-Whitney and Kruskal-Wallis and P<0.05 was taken as the significant level. Results: Histopathological assessment of kidney tissue following IP administration of silver nanoparticle indicated pathological changes including congestion, necrosis, inflammatory cell infiltration, vacuolar degeneration compared to the control group. Our findings showed that silver nanoparticles during the gestation period affects fetal organogenesis, evolution of neural structure, liver lobulation and fetal growth retardation. Mean number of somites in groups receiving doses of 200 and 400 mg kg, . significantly reduced compared to the control group (P<0.05). Conclusion: The obtained results suggest that  passing of silver nanoparticles through placenta is possible and damage caused by the particles  could lead to the deformity or developmental retardation of the fetus

Investigation the effect of copper nanoparticles on the toxicity and migration of keratinocyte cells

Background: Re-epithelialization has an important role in skin wound healing. Delays in re-epithelialization are more likely to create the chronic wound. Impaired wound healing leads to a large burden of morbidity and mortality. Current treatments based on the use of autografts, allografts and xenografts, suffer from limitations such as, quantity of donor skin available, donor-site infection, potential risk of disease transmission and rejection of the graft. Given this problems, nanomaterial such as copper nanoparticles has attracted considerable research interest because of their high surface area to volume ratio, high stability, clinical safety, and antibacterial effects. Epithelialization involves keratinocyte migration and proliferation to the wound site. Therefore, this study was conducted to investigate the effect of copper nanoparticles on keratinocyte cell migration and proliferation. Methods: This experimental study was performed in Royan Institute, Tehran in 2016. In this study we investigated the effect of copper nanoparticles on viability, migration and proliferation of keratinocyte cells. Cultured human foreskin Keratinocyte cells were exposed to various concentration (1, 10 and 100 µmol) and sizes (40 and 80 nm) of copper nanoparticles for 24, 48 and 72 hours. The copper nanoparticles toxicity was examined by MTS assay. Cell migration has also been investigated with the Scratch assay. Results: The results showed that the 1, 10 and 100 µmol concentrations of 40 and 80 nm copper nanoparticles were not toxic for cultured human foreskin keratinocyte cells after 24h. It was also found keratinocyte cell proliferation was increased by 1 µmol concentration of 80 nm copper nanoparticles after 72h. The results of the Scratch assay showed that the 1 µmol concentration of 80 nm copper nanoparticles significantly (P<0.05) increased keratinocyte cell migration compared to deionized water as of control group after 24h. Conclusion: It seems the 1 µmol concentration of 80 nm copper nanoparticle could stimulate keratinocyte cell migration and proliferation. However, in vivo studies conducted on animal model wound healing subjects are needed for determining re-epithelialization