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• W2081034228 endingPage "313" @default.
• W2081034228 startingPage "294" @default.
• W2081034228 abstract "Terephthalic acid (TPA), dimethyl terephthalate (DMT), and melamine (MA) induced calculi and transitional cell hyperplasia in urinary bladders of rats. A high incidence of calculi was induced in weanling rats, but the incidence was much lower in adult rats ingesting the same dietary concentration of the chemical. The dose-response curves for the induction of urolithiasis in weanling rats were extremely steep, consistent with the fact that the formation calculi can occur in urine that is supersaturated, but not in urine that is undersaturated with respect to the stone components. In the cases of TPA and DMT, stones were composed primarily of calcium terephthalate (CaTPA). By determining the solubility of CaTPA, the concentration of TPA that would be required to achieve urinary saturation was calculated, and a conservative estimate of the amount of TPA or DMT that would have to be absorbed in order to induce calculi was derived. TPA and MA induced bladder tumors in rats in chronic feeding studies. However, it is likely that these tumors were secondary to the development of calculi. TPA and MA are apparently nongenotoxic, and they do not appear to be metabolized. Increased cell replication in the urothelium of the bladder caused by chronic physical injury was probably a major factor in the mechanism of induction of bladder tumors by bladder stones. Bladder neoplasms occurred primarily in the high dose groups, and they were usually, although not invariably, associated with stones. The possibility that stones were passed or were lost during processing of tissues for histopathologic examination could explain the absence of calculi from some of the neoplastic bladders. The formation of bladder calculi is an example of a threshold effect. Although there is strong evidence linking bladder stones with the induction of tumors, the existence of thresholds in chemical carcinogenesis continues to be controversial. A decision by the U.S. Environmental Protection Agency concerning the levels of MA allowed to occur in the food chain indicates that data regarding thresholds, even in the case of urolithiasis, are not being utilized in the risk assessment process." @default.
• W2081034228 created "2016-06-24" @default.
• W2081034228 creator A5021073623 @default.
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• W2081034228 date "1985-09-01" @default.
• W2081034228 modified "2023-10-14" @default.
• W2081034228 title "The induction of bladder stones by terephthalic acid, dimethyl terephthalate, and melamine (2,4,6-triamino-s-triazine) and its relevance to risk assessment" @default.
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• W2081034228 doi "https://doi.org/10.1016/0273-2300(85)90044-3" @default.
• W2081034228 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3903881" @default.
• W2081034228 hasPublicationYear "1985" @default.
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