Add time:10/01/2019         Source:infona.pl

Na-nitrilotriacetic acid (Na 3 NTA) and Fe-nitrilotriacetic acid (FeNTA) have both been described to cause tumors in the urinary tract of rodents. However, these effects were observed using different modes of administration at extremely different dose levels and explained by different mechanisms. Whereas FeNTA causes an iron overload of cells and is genotoxic in various assays, Na 3 NTA is predominantly bound to zincin vivoand thereby causes cytotoxic effects in the urinary tract. In contrast to FeNTA, Na 3 NTA requires high dose levels to produce tumors. The aim of this study was to compare the effects of Na 3 NTA and FeNTA on cellular proliferation, histopathology, lipid peroxidation, and 8-OH-2′-deoxyguanosine levels in the kidneys as well as on the urinary excretion of Ca, Fe, and Zn. For evaluation of DNA synthesis both compounds were administered for 1 or 4 weeks to 14-week-old male Wistar rats at a tumor causing dose, Na 3 NTA via the diet at 150 ppm and 20,000 ppm ( ∼ 9 and ∼1000 mg/kg/day) and FeNTA ip at 25 mg/kg/day. An osmotic minipump, containing 20 mg/ml BrdU, was implanted subcutaneously 7 days before necropsy. Na 3 NTA showed nearly no effect on DNA replication after 1 week but a strong reaction after 4 weeks. The increase was 10- to 18-fold in different renal compartments. The enhancement of proliferation in the proximal tubules was nearly twice that in the distal tubules. In contrast, FeNTA caused DNA replication during the first week, and this was restricted to the proximal tubules. After 4 weeks there was an 18-fold increase in the outer stripe and no effect in the inner stripe of the outer medulla. The data presented give evidence to the assumption that both substances increase cell proliferation as a compensatory mechanism, causing different pattern of tubular proliferation in terms of time course and affected cell types. Both Na 3 NTA at 20,000 ppm and FeNTA led to increased lipid peroxidation, whereas increased levels of 8-OH-2′-deoxyguanosine were observed only after treatment with FeNTA. Urinary excretion of Zn was increased 30-fold after administration of 20,000 ppm Na 3 NTA but only 2-fold after administration of FeNTA. Urinary excretion of Ca and Fe remained unchanged after treatment with either Na 3 NTA and FeNTA. These results show that the Na 3 NTA-related proliferative effects are not mediated by an internal formation of FeNTA.

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