Examinando por Autor "Danize Aparecida Rizzetti"

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Egg white-derived peptides prevent male reproductive dysfunction induced by mercury in rats
(Elsevier, 2016-12-30) Danize Aparecida Rizzetti; Caroline Silveira Martinez; Alyne Goulart Escobar; Taiz Martins da Silva; Uranga, Jose Antonio; Franck Maciel Peçanha; Dalton Valentim Vassallo; Marta, Castro; Giulia Alessandra Wiggers
Oxidative stress in known to contribute to the male reproductive dysfunction induced by mercury (Hg). Our study tested the hypothesis that the egg white hydrolysate (EWH), a potent antioxidant in vitro, is able to prevent the effects of prolonged Hg exposure on male reproductive system in rats. For this, rats were treated for 60 days with: a) Untreated - saline solution (i.m.); b) Hydrolysate - EWH (1 g/kg/day, gavage); c) Mercury - HgCl2 (1st dose 4.6 mg/kg, subsequent doses 0.07 mg/kg/day, i.m.); d) Hydrolysate- Mercury. At the end of the treatment, sperm motility, count and morphological studies were performed; Reactive Oxygen Species (ROS) levels, lipid peroxidation, antioxidant capacity, histological and immu- nohistochemical assays on testis and epididymis were also carried out. As results, HgCl2-treatment decreased sperm number, increased sperm transit time in epididymis and impaired sperm morphology. However, these harmful effects were prevented by EWH. HgCl2-treatment also increased ROS levels, lipid peroxidation and antioxidant capacity in testis and epididymis as well as promoted testicular inflammation and histological changes in epididymis. EWH improved histological and immunohistochemical alterations, probably due to its antioxidant property. In conclusion, the EWH could represent a powerful natural alternative to protect the male reproductive system against Hg-induced sperm toxicity.
Potential benefits of egg white hydrolysate in the prevention of Hg-induced dysfunction in adipose tissue
(2022) Danize Aparecida Rizzetti; Patricia Corrales; Uranga, Jose Antonio; Gema Medina-Gómez; Franck Maciel Peçanha; Dalton Valentim Vassallo; Miguel, Marta; Giulia Alessandra Wiggers
Aim: To investigate the effects of egg white hydrolysate (EWH) on the lipid and glycemic metabolism disruption in the white adipose tissue (WAT) dysfunction induced by mercury (Hg). Experimental: Wistar rats were treated for 60 days: control (saline, intramuscular – i.m.); hydrolysate (EWH, gavage, 1 g kg−1 day−1); mercury (HgCl2, i.m., 1st dose 4.6 μg kg−1, subsequent doses 0.07 μg kg−1 day−1) and hydrolysate-mercury (EWH-HgCl2). Hg level and histological analyses were performed in epididymal WAT (eWAT), pancreas and liver. GRP78, CHOP, PPARα, PPARγ, leptin, adiponectin, and CD11 mRNA expressions were analyzed in eWAT. The plasma lipid profile, glucose, and insulin levels were measured. Antioxidant status was also evaluated in the plasma and liver. Results: EWH intake prevented the reduced eWAT weight, adipocyte size, insulin levels, and antioxidant defenses and the increased glucose and triglyceride levels induced by Hg exposure; hepatic glutathione levels were higher in rats co-treated with EWH. The increased mRNA expression of CHOP, PPARα, and leptin induced by Hg was reduced in co-treated rats. EWH did not modify the elevated mRNA expression of GRP78, PPARγ and adiponectin in Hg-treated rats. Increased levels of Hg were found in the liver; the co-treatment did not alter this parameter. EWH prevented the morphological and metabolic disorder induced by Hg, by improving antioxidant defenses, inactivating pro-apoptotic pathways and normalizing the mRNA expression of PPARs and adipokines. Its effects enabled an increase in insulin levels and a normal balance between the fat storage and expenditure mechanisms in WAT. Conclusions: EWH may have potential benefits in the prevention and management of Hg-related metabolic disorders.