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Animal studies have shown that SGLT2 inhibition decreases oxidative stress, which may explain the cardiovascular protective effects observed following SGLT2 inhibition treatment. Thus, we investigated the effects of two and twelve weeks SGLT2 inhibition on DNA and RNA oxidation. Individuals with type 2 diabetes ( n  = 31) were randomized to two weeks of treatment with the SGLT2 inhibitor empagliflozin treatment (25 mg once daily) or placebo. The primary outcome was changes in DNA and RNA oxidation measured as urinary excretion of 8-oxo-7,8-dihydro-2’-deoxyguanosine (8-oxodG) and 8-oxo-7,8-dihydroguanosine (8-oxoGuo), respectively. In another trial, individuals with type 2 diabetes ( n  = 35) were randomized to twelve weeks of dapagliflozin treatment (10 mg once daily) or placebo in a crossover study. Changes in urinary excretion of 8-oxodG and 8-oxoGuo were investigated as a  posthoc  analysis. Compared with placebo treatment, two weeks of empagliflozin treatment did not change urinary excretion of 8-oxodG (between-group difference: 0.3 nmol/24-hour (95% CI: −4.2 to 4.8)) or 8-oxoGuo (1.3 nmol/24-hour (95% CI: −4.7 to 7.3)). From a mean baseline 8-oxodG/creatinine urinary excretion of 1.34 nmol/mmol, dapagliflozin-treated individuals changed 8-oxodG/creatinine by −0.17 nmol/mmol (95% CI: −0.29 to −0.04) following twelve weeks of treatment, whereas placebo-treated individuals did not change 8-oxodG/creatinine (within-group effect: 0.10 nmol/mmol (95% CI: −0.02 to 0.22)) resulting in a significant between-group difference ( p  = 0.01). Urinary excretion of 8-oxoGuo was unaffected by dapagliflozin treatment. In conclusion, two weeks of empagliflozin treatment did not change DNA or RNA oxidation. However, a  posthoc  analysis revealed that longer-term dapagliflozin treatment decreased DNA oxidation.  Clinicaltrials.gov:  NCT02890745 and NCT02914691.HighlightsPlasma ferritin correlated with DNA and RNA oxidation in individuals with T2D.Twelve weeks dapagliflozin treatment decreased DNA oxidation.Dapagliflozin and empagliflozin treatment did not change RNA oxidation.Lipid peroxidation was unaffected by two weeks empagliflozin treatment. Plasma ferritin correlated with DNA and RNA oxidation in individuals with T2D. Twelve weeks dapagliflozin treatment decreased DNA oxidation. Dapagliflozin and empagliflozin treatment did not change RNA oxidation. Lipid peroxidation was unaffected by two weeks empagliflozin treatment.

Effects of two- and twelve-weeks sodium-glucose cotransporter 2 inhibition on DNA and RNA oxidation: two randomized, placebo-controlled trials