Accession Number : ADA460097
Title : Toxicological Evaluation of Depleted Uranium in Rats: Six-Month Evaluation Point
Corporate Author : ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
Personal Author(s) : Pellmar, T. C. ; Hogan, J. B. ; Benson, K. A. ; Landauer, M. R.
Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD= ADA460097
Report Date : FEB 1998
Pagination or Media Count : 30
Abstract : The use of depleted uranium (DU) munitions during Desert Storm resulted in a unique type of battlefield casualty, DU shrapnel wounds. The toxicity associated with embedded DU may differ significantly from other metals or other routes of uranium administration. This is a 6-month interim report of an 18- month study that is designed to assess the toxicity of implanted DU pellets. This study evaluates kidney, behavioral, and neural toxicity associated with intramuscularly implanted DU pellets (1-mm x 2-mm) and assesses tissues for histological changes and for uranium content. Rats were assigned to five experimental groups: 1) a non-implanted sham-surgical control group, 2) rats implanted with 20 tantalum (Ta) to control for fragment implantation, 3) rats implanted with low-dose DU (4 DU and 16 Ta pellets), 4) rats implanted with medium-dose DU (10 DU and 10 Ta pellets), and 5) rats implanted with high-dose DU (20 DU pellets). Uranium levels were high and dose-dependent in the kidney, urine, and bone. Despite high uranium levels in the kidney, no renal toxicity was evident. Between 23-26 weeks body weight in high-DU dose animals was significantly lower than controls. Unexpectedly, uranium was found in the brain of DU-implanted animals. No behavioral neurotoxicity was evident. Excitability of hippocampal neurons was reduced in the high DU dose animals at 6 months. These data suggest that at the 6-month time point, renal toxicity may be less of a hazard than anticipated. While these results indicate that toxicity is not evident at 6 months with exposure to embedded DU, there is a need to further investigate long-term effects in light of the high levels accumulated in some body tissues.
Descriptors : *TOXICITY , *PELLETS , *DEPLETED URANIUM , TEST AND EVALUATION , MILITARY OPERATIONS , METALS , TISSUES(BIOLOGY) , NERVOUS SYSTEM , WOUNDS AND INJURIES , NEUROTOXINS , AMMUNITION FRAGMENTS , KIDNEYS , HIPPOCAMPUS , TOXICOLOGY , HISTOLOGY , URINE , BODY WEIGHT , BEHAVIOR , HUMAN BODY , NERVE CELLS , CASUALTIES , HAZARDS , RATS , BATTLEFIELDS
Subject Categories : MEDICINE AND MEDICAL RESEARCH
RADIOACTIVITY, RADIOACTIVE WASTES & FISSION PROD
Distribution Statement : APPROVED FOR PUBLIC RELEASE