RNA oxidation and albuminuria in type 1 diabetes patients
2013
We examined the relationship between urinary excretion of the RNA oxidation marker 8-oxo-7,8-dihydroguanosine (8-oxoGuo) and kidney injury comparing type 1 diabetes patients with different levels of albuminuria (normoalbuminuria: N = 58, microalbuminuria: N = 46, macroalbuminuria: N = 46) and a nondiabetic control group (N = 57). Urinary 8-oxoGuo was measured in spot urine samples using ultraperformance liquid chromatography and tandem mass spectrometry. Urinary 8-oxoGuo was significantly higher in the patients [2.85 (2.45–3.33) vs. 2.49 (2.12–2.96) nmol/mmol creatinine, P = 0.01]. However, after adjustment for possible confounders of oxidative stress, the differences reduced slightly and became statistically nonsignificant (P = 0.07). There were no significant differences in the level of 8-oxoGuo between the three groups of patients (P = 0.53) and there were no significant associations between 8-oxoGuo and estimated glomerular filtration rate or albumin–creatinine ratio. In conclusion, urinary excretion of the RNA oxidation marker 8-oxoGuo does not differ between type 1 diabetes patients with different levels of albuminuria. Cardiovasc Endocrinol 2:103–105 c 2013 Wolters Kluwer Health | Lippincott Williams & Wilkins.
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