RESUMO
Purpose: Sodium thiosulfate (STS) is clinically reported to be a promising drug in preventing nephrolithiasis. However, its mechanism of action remains unclear. In the present study, we investigated the role of mitochondrial KATP channel in the renal protection mediated by STS. Materials and Methods: Nephrolithiasis was induced in Wistar rats by administrating 0.4% ethylene glycol (EG) along with 1% ammonium chloride for one week in drinking water followed by only 0.75% EG for two weeks. Treatment groups received STS, mitochondrial KATP channel opener and closer exclusively or in combination with STS for two weeks. Results: Animals treated with STS showed normal renal tissue architecture, supported by near normal serum creatinine, urea and ALP activity. Diazoxide (mitochondria KATP channel opening) treatment to the animal also showed normal renal tissue histology and improved serum chemistry. However, an opposite result was shown by glibenclamide (mitochondria KATP channel closer) treated rats. STS administered along with diazoxide negated the renal protection rendered by diazoxide alone, while it imparted protection to the glibenclamide treated rats, formulating a mitochondria modulated STS action. Conclusion: The present study confirmed that STS render renal protection not only through chelation and antioxidant effect but also by modulating the mitochondrial KATP channel for preventing urolithiasis.
Assuntos
Animais , Masculino , Antioxidantes/farmacocinética , Quelantes/farmacologia , Etilenoglicol , Nefrolitíase/prevenção & controle , Canais de Potássio/farmacologia , Tiossulfatos/farmacologia , Antioxidantes/uso terapêutico , Oxalato de Cálcio/metabolismo , Quelantes/uso terapêutico , Modelos Animais de Doenças , Eletroforese em Gel de Ágar , Rim/efeitos dos fármacos , Rim/patologia , Peroxidação de Lipídeos/efeitos dos fármacos , Nefrolitíase/patologia , Canais de Potássio/uso terapêutico , Distribuição Aleatória , Ratos Wistar , Reprodutibilidade dos Testes , Resultado do Tratamento , Tiossulfatos/uso terapêuticoRESUMO
Cyanide poisoning is a life threatening condition. But specific antidotes exist and can be easily prepared from available substances in hospital. Administration of antidotes will produce methemoglobin, which itself causes hypoxia. Nitrite induced methemoglobin can be extremely dangerous and even lethal. Before administering the antidotes, the diagnosis should be confirmed. Nitrite should not be given if the poisoning is mild or diagnosis is uncertain, to avoid excessive methemoglobin, dosage of sodium nitrite must be adjusted according to hemoglobin level (Table 1). Usage of sodium nitrite and sodium thiosulfate in the recommended doses are safe and effective for cyanide poisoning.