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Open Access Source of a Micro-Nutrient in a Semi-Synthetic Basal Diet as a Causative Factor in Inducing Urinary Calculi in Rats and Its Inhibition by PSC 833, a Potent Inhibitor of P-Glycoprotein

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We report a serendipitous finding of urinary calculi in rats fed a semi-synthetic basal diet. This observation was made during ongoing studies to evaluate the inhibitory effect of PSC 833, a potent inhibitor of P-glycoprotein, on development of tumors in rodent tumor model systems. A large number of specific-pathogen-free (SPF) female Sprague-Dawley and SPF male Fischer 344 rats being fed the diet were euthanized when it became evident clinically that they were uremic. At necropsy, the renal pelvis, ureters, and urinary bladder contained numerous calculi. The presence of urinary calculi was determined to be related to the source of a Food Chemical Codex grade of choline bitartrate. Rats being fed the same basal diet containing the United States Pharmacopia grade of choline bitartrate failed to develop urinary calculi. Interestingly, rats treated with the P-glycoprotein inhibitor were at significantly reduced risk of developing urinary calculi. This finding highlights how something seemingly innocuous as a minor dietary constituent can have a profound impact and, thereby, affect experimental outcome.

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Document Type: Research Article

Affiliations: 1: Departments of Laboratory Medicine & Pathobiology, University of Toronto, Banting Institute, 100 College Street, Toronto, ON, Canada, M5G 1L5 2: Division of Comparative Medicine, University of Toronto, Banting Institute, 100 College Street, Toronto, ON, Canada, M5G 1L5 3: Pharmacy and the, University of Toronto, Banting Institute, 100 College Street, Toronto, ON, Canada, M5G 1L5 4: BC Cancer Agency and the University of British Columbia, Vancouver, BC, Canada

Publication date: 2003-08-01

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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