title: Effect of age on the efficacy of Zn-diethylenetriaminepentaacetic acid therapy for removal of Am and Pu from beagles.
abstract: Decorporation of intravenously injected monomeric 241Am and 237+239Pu by the administration of 30 mumole Zn-diethylenetriaminepentaacetic acid (DTPA)/kg each day beginning 2 weeks after radionuclide injection was compared in beagles entered into the experiment when 3 months (juveniles). 1.9 years (young adults), or 10 years (mature adults) old and studied for about 5 months. DTPA therapy was most effective in the juvenile dogs and least effective in the mature adults. Retention of 241Am in the liver decreased from a pretreatment value for adults of about 50% of the injected activity to about 10% in the mature adults and less than 1% in the young adults at 140 days of treatment, while the liver retention of juveniles decreased from pretreatment values of about 16% to undetectable levels by 28 days of treatment. Plutonium retention in the liver decreased from adult pretreatment levels of about 30% of the injected activity (corrected for radioactive decay) to near 10% in the mature adults and 6% in the young adults at 140 days of treatment, while juvenile liver retention decreased from pretreatment values near 15% to undetectable levels by 56 days of treatment. Nonliver Am retention (mainly skeleton) decreased in mature adults from pretreatment values of about 45% of the injected activity to near 25%, in young adults from 35 to 20%, and in juveniles from roughly 70 to 9% by 140 days of DTPA administration. Nonliver Pu retention decreased from pretreatment values of about 50% of the injected activity (corrected for radioactive decay) for mature and young adults to about 30% by 140 days and from 75 to 16% in juveniles over the time period.
mesh_terms: D000375:Aging; D000576:Americium / Q000378:metabolism*; D000818:Animals; D003666:Decontamination; D004285:Dogs; D005260:Female; D008099:Liver / Q000378:metabolism; D008297:Male; D004369:Pentetic Acid / Q000627:therapeutic use*; D011005:Plutonium / Q000378:metabolism*; D015032:Zinc / Q000627:therapeutic use*
chemical_list: D011005:Plutonium; D004369:Pentetic Acid; D015032:Zinc; D000576:Americium