The role of coenzyme Q-10 in acute kidney injury induced by contrast in diabetic rats

Author(s)

Sheila Marques Fernandes

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Escola de Enfermagem (EE/SBD)
• Defense date: 2016-12-08

Examining board members

Maria de Fatima Fernandes Vattimo; Fernanda Teixeira Borges; Lilia de Souza Nogueira; Mirian Watanabe

• Advisor: Maria de Fatima Fernandes Vattimo

Abstract

Chronic hyperglycemia favors the occurrence of nephropathy induced by iodinated contrast (CIN). Diabetes Mellitus (DM) and CIN share oxidative damage mechanisms and induction of protective and cellular adaptation enzymes as coenzyme Q-10 (CoQ-10). The aim of this study was to investigate the role of COQ-10 in renal function and hemodynamics, oxidative profile and renal histology in diabetic rats submitted to the NIC model. Methods: Wistar rats, male, weighing 250-290 g, were randomized into two groups: Citrate: animals that received citrate buffer 0.01M (streptozotocin), 0.4 ml, intravenous (i.v.), once; Tween 80: animals that received Tween 80, 1% (CoQ-10 vehicle), 0.5 ml, intraperitoneal (i.p.), once; DM: animals given streptozotocin (65 mg/kg) i.v., once on the first day of the protocol; CI+DM: DM animals, on the 26º day protocol, tretated with iodinated contrast (CI, 6 ml/kg) i.p., once; DM+CI+COQ-10: DM animals preconditioned with COQ-10 (10 mg/kg), once a day, for 6 days from the 22º day and treated with CI. The protocol for all groups lasted 4 weeks. Physiological parameters evaluated were (food and water intake, corporal weight, blood glucose and right kidney weight), renal function (inulin clearance), renal hemodynamics (renal blood flow and renal vascular resistance), the oxidative profile (peroxides, nitric oxide and reactive substances to thiobarbituric acid in urine, thiols in renal tissue) and renal histological analysis. Results: DM animals showed hyperglycemia, polydipsia, polyuria, polyphagia, weight loss and increased weight kidney / animal relationship with reduced renal function, as well as a reduction on renal blood flow, increased renal vascular resistance and changes in oxidative profile with increased the excretion of metabolites and oxidative consumption of endogenous antioxidant reserve. DM+CI promoted further reduction in renal function, exacerbated hemodynamic changes and increase in oxidative stress parameters. COQ-10 administration preserved renal function, prevented hemodynamic changes and reduced oxidative stress in the DM + CI + COQ-10. Histological changes in DM and DM + CI were discrete and treatment with CoQ-10 prevented the progression of the histologic damage in the animals receiving CI. Conclusion: COQ-10 presented an antioxidant effect on the NIC in diabetic rats, by improving function and renal hemodynamics and reducing oxidative stress. (AU)

• FAPESP's process: 14/22551-1 - The role of the coenzyme Q10 in the iodinated contrast nephropaty in diabetic rats
• Grantee: Sheila Marques Fernandes
• Support Opportunities: Scholarships in Brazil - Master