A new approach for the synthesis of 3‐organoselanyl‐benzo[b]chalcogenophenes promoted by trichloroisocyanuric acid is reported. The reaction was carried out with electrophilic selenium species which were generated in situ by the reaction between trichloroisocyanuric acid and diorganyl diselenides using ethanol as solvent. The developed method uses mild reaction conditions and was efficient for the synthesis of different 3‐organoselanyl‐benzo[b]chalcogenophenes in a good to excellent yields. Analysis of 77Se NMR spectroscopy indicates that the electrophilic PhSeCl was formed in situ and a plausible reaction mechanism was proposed.
There is an increasing incidence of oxaliplatin (OXA)-induced hepatotoxicity. Therefore researchers’ attention has been drawn to therapeutic alternatives that may decrease OXA-induced hepatotoxicity. Studies indicate that oxidative stress plays a major role in OXA-induced liver injury. Since several pharmacological effects of 7-chloro-4-(phenylselanyl) quinole (4-PSQ) involve its antioxidant action, the hypothesis that this organoselenium compound could be promising for the treatment or prevention of hepatotoxicity induced by treatment with OXA was investigated. To test this hypothesis, male Swiss mice received OXA (10 mg/kg), on days 0 and 2, followed by the oral administration of 4-PSQ (1 mg/kg), on days 2 to 14. 4-PSQ reduced the plasma aspartate and alanine aminotransferase activity increased by exposure to OXA. The histopathological examination of the liver showed that 4-PSQ markedly improved OXA-induced hepatic injury. In addition, treatment with 4-PSQ reduced the oxidation of lipids and proteins (thiobarbituric acid reactive species levels and protein carbonyl content) and attenuated the increase of hepatic catalase and glutathione peroxidase activity caused by OXA. The inhibition of hepatic δ-aminolevulinic dehydratase activity induced by OXA was reverted by 4-PSQ. In conclusion, results indicate that 4-PSQ may be a good therapeutic strategy for attenuating OXA-induced liver damage.
Purpose: evaluating the relationship between oxidative damage oxaliplatin (OXA)-induced and the therapeutic potential of 7-chloro-4-(phenylselanyl) quinoline (4-PSQ) in kidney of mice.
Methods: Mice received OXA (10 mg/kg) or vehicle by intraperitoneal route (days 0 and 2). Oral administration of 4-PSQ (1 mg/kg) or vehicle was performed on days 2 to 14. On day 15, the animals were euthanized, and the kidneys and blood collected. The effect of OXA and/or 4-PSQ on urea, thiobarbituric acid reactive species (TBARS), non-protein thiol (NPSH) and protein carbonyl (PC) levels were investigated. Moreover, renal superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), glutathione S-transferase (GST), δ-aminolevulinic acid dehydratase (δ-ALA-D) and Na+, K+ ATPase activities were evaluated.
Results: Our findings revealed an increase on urea levels and a significant renal oxidative damage in OXA-induced mice. OXA exposure increased SOD, GPx and GST activities and caused a reduction on NPSH levels, CAT and GR activities. Na+, K+ ATPase and -ALA-D activities were reduced by OXA. 4-PSQ decreased plasmatic urea levels and renal oxidative damage. SOD, GPx, CAT, GR and Na+, K+ ATPase activities were restored by 4-PSQ.
Conclusion: 4-PSQ may be a good prototype for the treatment of OXA-induced renal injury.
tellurium through a simple methodology using silver catalysis. In contrast to other methodologies described in the literature, this protocol takes advantage of using Te0 for the synthesis of tellurides, skipping...
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