Proteção funcional da enzima heme-oxigenase-1 na lesão renal aguda isquêmica e tóxica

The Effect of Curcumin on Renal Ischemia/Reperfusion Injury in Diabetic Rats

Chronic kidney disease (CKD) and acute kidney injury (AKI) are global health problems that affect over 850 million people, twice the number of diabetic individuals around the world. Diabetes mellitus (DM) is known to increase the susceptibility to AKI. Plants and foods, such as curcumin, are traditionally used as treatments for various diseases due to its wide range of bioactive compounds that exert antioxidative, anti-inflammatory, antimicrobial and anticancer properties. The aim of this study is to evaluate the effect of curcumin in diabetic rats with AKI. Adult male Wistar rats, weighing between 250 and 290 g, were randomized into four groups: Citrate (citrate buffer, i.v., single dose, on Day 1 of the protocol); DM (streptozotocin (STZ), 65 mg/k, single dose, i.v., on Day 1); DM + I/R (DM rats that, on Day 26, had the renal pedicle clamped for 30 min on both sides); DM + I/R + Curcumin (DM + I/R rats submitted to curcumin treatment). Results showed that IR worsened renal function and oxidative stress in DM rats, but the DM + IR + Curcumin group showed an increase in inulin clearance and a decrease in serum creatinine and in NGAL, in addition to an improvement in renal hemodynamics. These effects were accompanied by a reduction in oxidative and nitrosative metabolites and an increase in the thiol antioxidant reserve when curcumin was administered to the DM + IR group.

Effect of curcumin on acute chronic kidney disease due to ischemia-reperfusion syndrome

OBJECTIVE

To evaluate the effect of curcumin on renal function, hemodynamics, and renal oxidative profile of rats with chronic kidney disease (CKD) subjected to renal ischemia-reperfusion injury (IRI).

METHODS

Wistar rats, 250-300 g, distributed in four groups: Sham (n = 5), CKD simulation; CKD (n = 5), 5/6 renal ablation for CKD induction; CKD + IRI (n = 5), CKD and renal pedicle clamping for 30 minutes; and CKD + IRI+curcumin (n = 5), CKD + IRI, curcumin administration 30 mg/kg/day, orally, for 10 days. Renal function (inulin clearance, urine flow, plasma creatinine), hemodynamics (blood pressure), and oxidative profile (peroxides, TBARS, and urine nitrate, non-protein soluble thiols in renal tissue) were evaluated.

RESULTS

The CKD + IRI + curcumin group showed increased inulin clearance and reduced plasma creatinine, decreased RVR and increased RBF, decreased oxidative metabolites in urine and increased thiols in renal tissue when compared with the CKD + IRI group.

CONCLUSION

The treatment with curcumin preserved renal function and hemodynamics of animals with acute CKD, improving oxidative profile, with reduction of oxidants and preservation of antioxidant reserve.

Efeito da curcumina na doença renal crônica agudizada pela síndrome isquemia-reperfusão

RESUMO Objetivo: Avaliar o efeito da curcumina na função renal, hemodinâmica e perfil oxidativo renal de ratos com doença renal crônica (DRC) submetidos a isquemia-reperfusão renal (I/R). Métodos: Ratos Wistar, 250–300 g, distribuídos em quatro grupos: Sham (n = 5), simulação da DRC; DRC (n = 5), ablação de 5/6 dos rins para indução de DRC; DRC + I/R (n = 5), DRC e clampeamento do pedículo renal por 30 minutos; DRC + I/R + curcumina (n = 5) e DRC + I/R, administração de curcumina 30 mg/kg/dia, via oral, por 10 dias. Foram avaliadas a função renal (clearance de inulina, fluxo urinário, creatinina plasmática), hemodinâmica (pressão arterial) e perfil oxidativo (peróxidos, TBARS e nitrato urinário, tióis solúveis não proteicos no tecido renal). Resultados: O grupo DRC + I/R + curcumina apresentou elevação do clearance de inulina e redução da creatinina plasmática, diminuição da RVR e aumento do FSR, diminuição de metabólitos oxidativos na urina e aumento dos tióis no tecido renal quando comparado ao grupo DRC + I/R. Conclusão: O tratamento com curcumina preservou a função e hemodinâmica renal dos animais com DRC agudizada, promovendo melhora no perfil oxidativo, com redução de oxidantes e preservação de reserva antioxidante.

[The sepsis as cause of acute kidney injury: an experimental model]

Sepsis associated with multiple organ failure such as acute kidney injury (AKI) shows a high mortality rate in critically ill patients. This study investigated the sepsis induced AKI in experimental models. Adult, males, Wistar rats divided into the following groups: Control-surgical control and Sepsis-sepsis induction for the cecal ligation and puncture (CLP). Physiological parameters (rectal temperature, mean arterial pressure-MAP, serum glucose and urinary flow); renal function (creatinine clearance); oxidative stress (urinary peroxides and thiobarbituric acid reactive substances-TBARS) and kidney histological analysis were evaluated. That study concludes that sepsis induces AKI by endothelial injury with hemodynamic dysfunction, release of inflammatory mediators and reactive oxygen species (ROS) generation by tubular cells, in an association of renal vasoconstriction due to hemodynamic and inflammatory disturbances.

Sinvastatina e lesão renal aguda isquêmica em ratos

OBJETIVOS: O estudo visou verificar a ação renoprotetora da sinvastatina em modelo animal de isquemia/reperfusão por 30 minutos. MÉTODOS: A isquemia foi obtida por meio do clampeamento dos pedículos renais bilaterais por 30 minutos, seguida de reperfusão. Ratos Wistar, machos foram usados pesando entre 250-300g, distribuídos nos seguintes grupos: SHAM (controle, sem clampeamento renal); Isquemia (isquemia renal por 30 minutos); Isquemia+Estatina (sinvastatina 0,5 mg/kg, via oral durante três dias). A função renal (clearance de creatinina, método de Jaffé), a osmolalidade urinária, os peróxidos urinários foram avaliados. RESULTADOS: Os resultados mostraram que a estatina melhorou a função renal, a osmolalidade urinária e reduziu a excreção de PU. CONCLUSÃO: Em síntese, o estudo confirmou o efeito renoprotetor da estatina, com ação antioxidante de proteção renal.