ABSTRACT
OBJECTIVE: To establish a New Zealand rabbit model of acute kidney injury induced by cisplatin. METHODS: A total of 24 male New Zealand rabbits were randomly divided into control group,low-,medium-and high-dose cisplatin group according to the body mass. Rabbits were injected with cisplatin at 0. 0,1. 0,2. 0,4. 0 mg/kg body weight by auricular vein. Rabbits in low-dose group was continuously injected for 5 days,medium-dose group was continuously injected for 3 days,and the high-dose group was injected for once per day. Rabbits in the control group did not receive any treatment. Blood was collected from the middle ear artery and 24 h urine was taken before exposure and on day 1,day 3,day 5 and day 7 of injection. The serum creatinine( Scr) and urea nitrogen( BUN) were detected by colorimetric method,and 24 h urine kidney injury molecule 1( KIM-1) was measured by enzyme-linked immunosorbent assay. Plasma platinum,24 h urinary platinum and renal platinum level were detected by inductively coupled plasma mass spectrometry.At the end of the experiment,rabbits were sacrificed and the left kidney was taken for histopathological examination.RESULTS: The body mass of rabbits of the low-,medium-and high-dose groups on day 7 after cisplatin exposure was lower than that of the control group( P < 0. 05),and lower than that of the same group before exposure( P < 0. 05). After 3 days of exposure,the Scr level in each dose group was higher than that of the control group( P < 0. 05),the Scr level on day 3and day 5 in medium-and high-dose groups were higher than that of the low-dose group( P < 0. 05). The BUN levels on day 3 and day 5 in medium-and high-dose group were higher than that of the control group and low-dose group( P <0. 05),the BUN levels on day 7 in three dose groups were higher than that of the control group( P < 0. 05). The levels of plasma platinum and 24 h urinary platinum in the three doses groups of New Zealand rabbits on day 1,day 3,day 5 and day 7 after exposure were higher than that of the control group( P < 0. 05),and were higher than the pre-treatment levels of the same group( P < 0. 05). The level of 24 h urinary KIM-1 in the meclium-dose group of New Zealand rabbits was higher than that of the control group on day 3 of exposure( P < 0. 05). The level of 24 h urinary KIM-1 in the mediumdose group of New Zealand rabbits on the 5th day after exposure was higher than that of the control group( P < 0. 05). The renal platinum levels in the three groups of New Zealand rabbits were higher than that in the control group( P < 0. 05).The pathological changes of rabbit kidney caused by cisplatin are mainly tubular dilatation,protein cast,alkalophilic and interstitial nephritis. CONCLUSION: Cisplatin can induce acute kidney injury in rabbits,and the degree of injury is dosedependent. The dose of 1. 0 mg/kg body weight continuous injection for 5 days is closely related to clinical use of cisplatin,which is recommended for model establishment.