[Electrolytic drinking water improves the metabolism of uric acid in the SD rats with hyperuricemia]

To investigate the effects of electrolytic drinking water on the hyperuricemia and the potential mechanism.

The 6-week-old SD rats were induced as the animal model with hyperuricemia by yeast extract(10 g/kg) and adenine(100 g/kg) gavage(twice per day) combined with oxygen oxazine acid potassium(300 mg/kg, the 1~(st), 5~(th) and 10~(th )day) i. p. Then the rats were supplied electrolytic drinking water in different dosages(1 mL, 2 mL and 3 mL) by gavage for 7 days. Weight was measured at regular intervals. The 24-hour urine was sampled by metabolic cage for the measurements of uric acid, creatinine and urea nitrogen levels. The parameters for the uric acid clearance were calculated. The serum was sampled after execution for the determination of serum uric acid, creatinine. The activities of xanthine oxidase and adenine dehydrogenase were detected. The morphological measurements of stomach and kidney were completed.

The hyperuricemia model was successfully induced by this method. In the intervention, the pH of urine was significantly elevated along with the electrolytic drinking water intake(P<0. 01). The excretion of uric acid in the rats with hyperuricemia was significantly increased while administrated with electrolytic drinking water. The effects of improving uric acid excretion were enhanced along with the intake of electrolytic drinking water. The levels of serum uric acid(group Model, Model+Treatment 1, Model+Treatment 2 and Model+Treatment 3: 693. 7 μmol/L, 668. 1 μmol/L, 642. 5 μmol/L, 633. 1 μmol/L), urine uric acid(5740. 0 μmol/L, 5894. 1 μmol/L, 5562. 3 μmol/L, 5083. 2 μmol/L) and urea nitrogen(11. 40 mmol/L, 10. 47 mmol/L, 9. 54 mmol/L, 8. 93 mmol/L) were significantly decreased in the model rats with high dose intervention(P<0. 05). Clearance of uric acid was obviously increased(9. 27%, 10. 40%, 10. 44%, 11. 13%, P<0. 05). However, no pathological change was observed among the three groups with intervention.

The electrolytic drinking water intake is benefit for the excretion of uric acid of hyperuricemia rat. Enhancing alkalization of urine is considered as the important mechanism of the beneficial effects.