O efeito protetor do bicarbonato de sódio na nefropatia induzida por contraste radiológico em ratos

Contrastes radiológicos iodados – CI são causa de lesão renal aguda – LRA. Avaliar o efeito renoprotetor do bicarbonato de sódio (Bic) sobre a função renal (clearance de creatinina, Jaff é, Clcr-ml/min/100g) e o perfi l oxidativo (excreção de peróxidos, PU e de malondealdeído urinários, FOX-2 e TBARs, nmol/mgCr ) em ratos com CI. Ratos machos adultos Wistar, 250-300g, tratados 1x/dia, por 5 dias, foram divididos nos grupos: Salina (solução salina 0,9%, 3ml/kg/dia, intraperitoneal-i.p.); CI (ioxitalamato de meglumina e sódio, 3ml/kg, i.p); Bic+Salina (Bic 3ml/kg, i.p, 1 hora antes e 1 hora depois da Salina); Bic+CI (Bic 3ml/ kg, i.p, 1 hora antes e 1 hora depois do CI). CI induziu LRA e o Bic confi rmou seu efeito renoprotetor antioxidante (Clcr/TBARs/PU Salina: 0,59±0,03/0,11±0,02/1,29±0,24 vs Bic+Salina 0,58±0,03/0,13±0,02/1,32±0,64 vs CI 0,22±0,02A/0,19±0,02A/4,77±0, 24A vs Bic+CI 0,51±0,04B/0,13±0,3B/1,80± 0,04B, A/B p<0,05). O Bic confi rmou efeito protetor na LRA por CI, podendo ser considerado como possibilidade terapêutica para pacientes submetidos a CI.

Radiological iodinated contrasts (IC) agents cause acute kidney injury (AKI). To evaluate the renoprotective eff ect of sodium bicarbonate (Bic) on renal function (creatinine clearance [Clcr], Jaff é, and Clcr mL·min-1100 g-1) and the oxidative profi le (peroxide excre- tion, urinary peroxides, urinary malondialdehyde, FOX-2 expression, and thiobarbituric acid reactive substance [TBARS; nmol/mg Cr]) in rats treated with an IC agent. Adult male Wistar rats weighing 250–300 g were treated once daily for 5 days with one of the following treatments: saline (0.9%, 3 mL·kg-1day-1intraperitoneally [i.p.]), IC agent (sodium and meglumine ioxitalamate, 3 mL/kg, i.p.), Bic + Saline (3-mL/kg Bic, i.p., 1 h before and atier saline treatment), and Bic + IC (3-mL/kg Bic, i.p., 1 h before and atier the IC treatment). The IC agent induced AKI, and the antioxidant renoprotective effect of Bic was confirmed (Clcr/TBARS/urinary peroxide: saline group, 0.59 ± 0.03/0.11 ± 0.02/1.29 ± 0.24; Bic + Saline group, 0.58 ± 0.03/0.13 ± 0.02/1.32 ± 0.64; IC group, 0.22 ± 0.02/0.19 ± 0.02/4.77 ± 0.24; Bic + CI group, 0.51 ± 0.04/0.13 ± 0.3/1.80 ± 0.04; p<0.05). The protective eff ect of Bic in the ICinduced AKI was confi rmed; hence, Bic administration may be considered as a therapeutic option for patients undergoing IC-enhanced radiography.

Radiological iodinated contrasts (IC) agents cause acute kidney injury (AKI). To evaluate the renoprotective eff ect of sodium bicarbonate (Bic) on renal function (creatinine clearance [Clcr], Jaff é, and Clcr mL·min-1100 g-1) and the oxidative profi le (peroxide excre- tion, urinary peroxides, urinary malondialdehyde, FOX-2 expression, and thiobarbituric acid reactive substance [TBARS; nmol/mg Cr]) in rats treated with an IC agent. Adult male Wistar rats weighing 250–300 g were treated once daily for 5 days with one of the following treatments: saline (0.9%, 3 mL·kg-1day-1intraperitoneally [i.p.]), IC agent (sodium and meglumine ioxitalamate, 3 mL/kg, i.p.), Bic + Saline (3-mL/kg Bic, i.p., 1 h before and atier saline treatment), and Bic + IC (3-mL/kg Bic, i.p., 1 h before and atier the IC treatment). The IC agent induced AKI, and the antioxidant renoprotective effect of Bic was confirmed (Clcr/TBARS/urinary peroxide: saline group, 0.59 ± 0.03/0.11 ± 0.02/1.29 ± 0.24; Bic + Saline group, 0.58 ± 0.03/0.13 ± 0.02/1.32 ± 0.64; IC group, 0.22 ± 0.02/0.19 ± 0.02/4.77 ± 0.24; Bic + CI group, 0.51 ± 0.04/0.13 ± 0.3/1.80 ± 0.04; p<0.05). The protective eff ect of Bic in the ICinduced AKI was confi rmed; hence, Bic administration may be considered as a therapeutic option for patients undergoing IC-enhanced radiography.

Contrastes radiológicos iodados - CI son causa de lesión renal aguda–LRA. Evaluar el efecto renoprotector del bicarbonato de sodio (Bic) en la función renal (clearance de creatinina, Jaff é, Clcr-ml/min/100g) y el perfi l oxidativo (excreción de peróxidos, PU y de malondealdehido urinarios, FOX-2 e TBARs, nmol/mgCr) en ratones con CI. Ratones machos adultos Wistar, 250-300g, tratados 1x/día durante 5 días, fueron divididos en grupos: Salina (solución salina 0,9%, 3ml/kg/día, intraperitoneal-i.p.); CI (ioxitalamato de meglumina y sodio, 3ml/kg, i.p); Bic+Salina (Bic 3ml/kg, i.p, 1 hora antes y 1 hora después de la Salina); Bic+CI (Bic 3ml/kg, i.p, 1 hora antes y 1 hora después del CI). CI indujo LRA y el Bic confirmó su efecto renoprotector antioxidante (Clcr/TBARs/PU Salina: 0,59±0,03/0,11±0,02/1,29±0,24 vs Bic+Salina 0,58±0,03/0,13±0,02/1,32±0,64 vs CI 0,22±0,02A/0,19±0,02A/ 4,77±0,24A vs Bic+CI 0,51±0,04B /0,13±0,3B/1,80±0,04B,A/B p<0,05). El Bic confi rmó efecto protector en la LRA por CI, pudiendo considerárselo posibilidad terapéutica para pacientes sometidos a CI.

À FAPESP pelo subsídio recebido para a realização deste estudo (Processo FAPESP 2010/01008-7).