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© 1989 Oxford University Press

research-article

Reversible Uranyl Fluoride Nephrotoxicity in the Long Evans Rat

G. L. DIAMOND*,1, P. E. MORROW*, B. J. PANNER{dagger}, R. M. GELEIN* and R. B. BAGGS{ddagger}

*Environmental Health Sciences Center, School of Medicine and Dentistry, University of Rochester Rochester, New York 14642 {dagger}Departments of Pathology, School of Medicine and Dentistry, University of Rochester Rochester, New York 14642 {ddagger}Laboratory Animal Medicine, School of Medicine and Dentistry, University of Rochester Rochester, New York 14642

Received April 1, 1988; accepted January 19, 1988

Severity and duration of renal injury produced by low levels of uranyl fluoride (UO2F2) were examined in the rat. Rats received multiple ip injections of UO2F2 (cumulative dose: 0.66 or 1.32 mg U/kg body wt). Renal injury was characterized histologically by cellular and tubular necrosis of pars recta of proximal tubule (S2 and S3), with less severe cellular injury to thick ascending limb of loop of Henle and collecting tubule. Injury was evident when renal uranium levels were between 0.7 and 1.4 µg U/g wet kidney and was most severe when renal uranium burden was between 3.4 and 5.6 µg U/g. Repair of injury was rapid, with complete restoration within 35 days after exposure. Associated with injury were abnormalities in renal function, including impaired tubular reabsorption, proteinuria, and enzymuria, which appeared temporally related, to variable degrees, to progression of renal injury. Thus, reversible renal injury occurs in the rat at levels of uranium in kidney below the present Nuclear Regulatory Commission standard of 3 µg U/g kidney for renal injury in humans.


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