Effect of renal ischaemia reperfusion on calcium oxalate retention.

The effect of ischaemia reperfusion induced renal injury for calcium oxalate deposition under normal and simulated conditions was studied. Male Wistar rats of both control (group I) and urolithic (group II) groups underwent (1 h) unilateral renal artery occlusion and were subjected to 1, 3, 6, 12, 24 and 72 h reperfusion. The group I rats subjected to 1 h renal ischaemia followed by 3 and 6 h reperfusion had significant oxalate retention than that of sham operated controls. In group II, under hyperoxaluric condition, in addition to accumulation of oxalate, calcium oxalate deposits were also observed. The increased retention of calcium oxalate was attributed to increased oxalate binding protein activity, oxalate synthesizing enzymes lactate dehydrogenase and xanthine oxidase activities and accumulation of calcium. Our findings suggested that renal cellular injury produced by ischaemia reperfusion could accelerate calcium oxalate precipitation reaction.