Herein we evaluated the histopathological alterations and expression patterns of multixenobiotic resistence (MXR) and autophagic proteins in liver samples of fish chronically exposed to anthropogenic contaminants in a highly polluted river, and then again after they had been transferred to good quality water. Two groups were established: euthanized on the day of capture (0 h), and maintained for 30 days in a tank (30 d). The fish of 0 h presented liver with vacuolated and hypertrophic hepatocytes. Also, it was observed strong immunostaining of cathepsin-D, LC3-II and P-gp. Necrosis and apoptosis were also observed throughout the liver. Conversely, the second group (30 d) showed recovery of the liver normal histology and weak immunoreaction of the studied proteins. So, our results indicated that there was a hepatic recovery in the fish kept in good quality water, as showed by the decreased expression of cathepsin-D, LC3-II, and the MXR (P-gp). Therefore, the alterations here observed could be proposed as potential biomarkers to be tested for following the impacts of remediation or mitigation measures to environmental impacts.
Brazil is the world's largest consumer of pesticides. To monitor the quality of food sold in the country, the Program for Analysis of Pesticide Residues in Food (Programa de Análise de Resíduos de Agrotóxicos em Alimentos - PARA) was created, responsible for carrying out analyzes of these foods and providing annual reports. The objective of this study was to carry out a survey of the information contained in these reports on the residues of pesticides found on unsatisfactory samples (unauthorized pesticides and/or above the permitted limit). This is a descriptive documentary study, based on the reports available (2001 to 2018). Information was collected on the pesticides that most appeared among the samples considered unsatisfactory and their possible damage to human health. Strawberries, bell peppers, and cucumbers presented the largest numbers of samples unsatisfactory, mostly because of the presence of pesticides unauthorized. The pesticides that have been repeated the most irregularly were chlorpyrifos, carbendazim, acefate and metamidophos, the latter has been banned since 2011 in Brazil. Evidence show that such pesticides are toxic to the human organism. Measures are needed to better control and inspect food and pesticides sold in Brazil, also raise awareness among the population and rural producers.
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