We investigated the effects of N'-nitrosodimethylamine (NDMA) induced toxicity on red blood cell rheology in male rats and identified bands in proteomic profiles of brain which can be used as novel markers. Polyacrylamide gel electrophoresis (PAGE) profiles exhibited constitutive as well as induced expression of the polypeptides. Remarkably, the molecular weight range of the polypeptides (8–150 kDa) corresponded to that of the family of heat shock proteins. Our results revealed significant changes in blood parameters and showed the presence of acanthocytes, tear drop cells, spicules and cobot rings in the treated categories. Lactate dehydrogenase and esterase zymograms displayed a shift to anaerobic metabolism generating hypoxia-like conditions. This study strongly suggests that NDMA treatment causes acute toxicity leading to cell membrane destruction and alters protein profiles in rats. It is therefore recommended that caution should be exercised in using NDMA to avoid risks, and if at all necessary strategies should be designed to combat such conditions.
Chromium oxide nanoparticles (CrO NPs) have a wide range of applications in industry. They are used as pigments, catalysts, wear-resistant or high-temperature-resistant coating material and are used in liquid crystal displays. In view of ever escalating use of NPs, risk assessment becomes obligatory to ensure the safety of both human health and the ecosystem. The present study was designed and conducted to evaluate biochemical changes and histopathological alterations in kidneys and brain of rats, following exposure to CrO NPs. Male Wistar rats were divided into low-dose (50 µg/100 g body weight (bwt) groups and high-dose (200 µg/100 g bwt) groups. Each group type received oral administration of CrO NPs for multiple durations (single dosing, once daily for 7 days and once daily for 14 days, respectively). According to our data, this allotment presented a meaningful picture of NPs behaviour in different scenarios. In the kidneys and brain of CrO NPs-exposed animals, reactive oxygen species (ROS) production caused a significant increase in malondialdehyde (MDA) concentration along with a significant decrease in superoxide dismutase and glutathione levels, as compared to controls. Histopathological changes in these organs confirmed cellular injury and functional damage due to exposure to CrO NPs. In this study, we have distinguished pathological alterations consequent to deleterious oxidative stress due to enhanced ROS generation after CrO NPs exposure.
Metal oxide nanoparticles (NPs) have widespread uses ranging from nanoelectronics to nanotherapeutics. Because of their expanding industrial applications, a better understanding of their toxicity is needed. So far, limited reports are available on chromium oxide NPs (Cr2O3 NPs) toxicity. In this work, Cr2O3 NPs were synthesized and characterized in a sequential manner using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and transmission electron microscopy. Dose- and time-dependent toxicity assessment of Cr2O3 NPs was carried out in Wistar rats by examining liver function biomarkers, tissue histopathology, micronuclei (MN) formation, and chromosomal aberrations (CAs) in bone marrow along with sperm abnormalities. The results of this study demonstrated typical XRD and FTIR patterns of Cr2O3 NPs with a size of approximately 23.47 nm. Animals exposed to Cr2O3 NPs, exhibited a significant increase in aspartate transaminase, alanine transaminase, alkaline phosphatase, gamma glutamyltransferase, and total bilirubin, signifying liver injury. Histopathology data also supported the marked alterations in the liver biochemistry of NPs-exposed animals. Further, an increase in the frequency of MN, CA, and sperm abnormalities suggested Cr2O3 NPs-mediated genotoxicity. It is, therefore, suggested that possible safety issues of Cr2O3 NPs should be addressed promptly with limited future use in occupational settings.
Haematological tests are signifi cant diagnostic tools that are equally valuable as indicators of toxic insult or stress due to xenobiotics and environmental fl uctuations. Present study was designed to investigate alterations in primary renal function markers, pathological changes in kidneys and variations in RBCs shape of male wistar rats due to chromium oxide nanoparticles (Cr 2 O 3 NPs) exposure. Cr 2 O 3 NPs are transition metal oxide NPs which are widely being used as catalysts, pigments and coating materials. Therefore, toxicological evaluation is fundamental with respect to their increasing applications. In the current study, synthesis of Cr 2 O 3 NPs was accomplished by sol -gel method and characterized in sequential manner by electron microscopy (TEM and SEM). TEM analysis revealed size -distribution of test NPs in the range 22.50 ± 1.76 nm. SEM represented the morphological features with high homogeneity of sample NPs validating Cr 2 O 3 NPs synthesis. Toxicological fi ndings revealed deviations in renal function test of treated rats with respect to the control group indicative of kidney damage. Blood Urea Nitrogen (BUN) was found to be signifi cantly higher (p < 0.05) after 14 days high dose exposure in comparison to control rats. Extensive changes in kidneys architecture were noted after repeated exposures to high dose. Various structural deformations of RBCs including tear drop cells, bite cells, elliptocytes, echinocytes etc were also observed. Results of present investigations, though preliminary but clearly demonstrate that oral administration of Cr 2 O 3 NPs induces biochemical changes consequently leading to alterations in renal function parameters and RBC shapes of exposed rats.
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