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/sup 99/Mo metabolism in sheep after the intravenous injection of (/sup 99/Mo) thiomolybdates

Journal Article · · J. Inorg. Biochem.; (United States)
(/sup 99/Mo)di-, tri-, and tetrathiomolybdate (5.4 to 62.5 mg of Mo) were given by intravenous injection to sheep maintained on a sulfur-supplemented (3 g of S/kg) diet. All the compounds were metabolized very rapidly over the first 15 min postinjection, but relatively slowly thereafter, with a t1/2 of about 30 hr for dithiomolybdate and 40 h for tri- and tetrathiomolybdate. The (/sup 99/Mo) metabolites present in plasma were identified by Sephadex G-25 chromatography. The main fate of the compounds injected appeared to be stepwise transformation to molybdate and subsequent rapid urinary elimination. Over 90-100 hr more than 90% of the radioactivity was excreted in urine, compared to less than 5% in the feces. The trichloroacetic acid (TCA) solubility of plasma copper and the diamine oxidase activity of ceruloplasmin was depressed, particularly over the first 15 min postinjection and a more persistant TCA-insoluble Cu fraction was apparent.
Research Organization:
Univ. of Dublin, Ireland
OSTI ID:
6742938
Journal Information:
J. Inorg. Biochem.; (United States), Journal Name: J. Inorg. Biochem.; (United States) Vol. 19:2; ISSN JIBID
Country of Publication:
United States
Language:
English