Cristiano Jorge Riger

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In Saccharomyces cerevisiae, accumulation of cadmium-glutathione complex in cytoplasm inhibits cadmium absorption, glutathione transferase 2 is required for the formation of the complex and the vacuolar gamma-glutamyl transferase participates of the first step of glutathione degradation. Here, we proposed that Lap4, a vacuolar amino peptidase, is involved(More)
Cadmium (Cd2+) is a toxic environmental contaminant for biological systems, which can form complexes with reduced glutathione (GSH), and thus alter the intracellular redox state. In Saccharomyces (S.) cerevisiae, bis(glutathionato)cadmium (Cd-[GS]2) complexes can be removed from the cytosol and transported into the vacuole by a glutathione-conjugated pump,(More)
Cadmium (Cd(2+)) is a toxic heavy metal which triggers several toxic effects in eukaryotes, including neurotoxicity and impaired calcium metabolism. In the model organism Saccharomyces cerevisiae, the best characterized pathway for Cd(2+) detoxification involves conjugation with glutathione (GSH) and subsequent transport to vacuoles by Ycf1p, an ATPase(More)
In this work, we verified that yeast cells deleted in ZRT1 were not capable of transporting cadmium, suggesting that the transport of this metal into the cell would be carried out through this zinc transporter. On the other hand, cadmium absorption shown by a Deltagsh1 strain (a mutant not able of synthesizing glutathione) was twofold higher than in the(More)
This experimental study aimed to evaluate colon healing after portal ischemia followed by reperfusion. Seventy male Wistar rats randomly distributed in four groups were used: Group 1, colonic anastomosis (n = 20); Group 2, portal ischemia-reperfusion (n = 20); Group 3, colonic anastomosis and portal ischemia-reperfusion (n = 20); and Group 4, control (n =(More)
In a previous paper, we demonstrated that the cytoplasmic level of glutathione-cadmium complex affects cadmium absorption by Saccharomyces cerevisiae, a usual eukaryotic cell model for studies of stress response. Furthermore, it was also observed that the absorption of this non-essential metal seems to be achieved by Zrt1, a zinc transporter of high(More)
Although carcinogenesis caused by metals has been intensively investigated, the mechanisms of action, especially at the molecular level, are still unclear. This work aimed to investigate Cd(2+), Cu(2+), Ni(2+), Cr(3+), and Zn(2+) mutagenicity and its relationship with oxidative stress. We have applied the Functional Assay for the Separation of Alleles in(More)
Extracts and essential oils from plants are important natural sources of pesticides. These compounds are considered an alternative to control ectoparasites of veterinary importance. Schinus molle, an endemic species of Brazil, produces a high level of essential oil and several other compounds. The aim of this work was to determinate the chemical composition(More)
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