Quercetin, a Powerful Antioxidant Bioflavonoid, Prevents Oxidative Damage in Different Tissues of Long-Term Diabetic Rats

Objective: The role of oxidant damage on the development of end-organ injuries caused by diabetic rat is well known. The aim of this study is to examine the effect of quercetin, which is a strong antioxidant bioflavonoid, on oxidant damage and antioxidant capacity in various organs in the case of medium-term or long-term diabetic rat. Material and Methods: Forty-eight male Wistar rats were divided into five groups, namely, control group, diabetic group of 8-weeks, diabetic group of 16-weeks, quercetin treated diabetic group of 8-weeks, and quercetin treated diabetic group of 16-weeks. At the end of the experiment, malondial- dehyde levels, superoxide dismutase, catalase, and glutathione peroxidase activities were measured in the lung, aorta, heart, spleen, liver, and kidney tissues. Results: MDA levels were elevated in all tissues except in the lung in non-treated diabetic groups. Quercetin treatment increased the antioxidant en- zyme capacities and considerably reduced oxidant damage. Conclusion: We suggest that quercetin has a protective effect on the aorta, heart, brain, liver, and kidneys from oxidant damage in the case of medium- term or long-term diabetic rat. It can be argued that quercetin is effective by increasing the antioxidant defence capacity in this process.