title: Interactions of gold with cytosolic selenium-containing proteins in rat kidney and liver.
abstract: Rats injected with aurothioglucose (ATG) for 5 days were subsequently injected with [75Se]selenious acid and killed after 3 days. Kidney and liver cytosols were chromatographed on Sephadex G-150. 75Se in kidney was associated with high molecular weight (HMW), 85,000 Mr, 26,000 Mr, and 10,000 Mr proteins and with a nonprotein fraction. The elution profile of liver cytosol was similar to that of kidney, but without a 26,000 Mr protein. ATG injection increased the association of 75Se with all fractions of kidney cytosol except the 85,000 Mr fractions, which contained Se-glutathione peroxidase (SeGSHPx) activity; 75Se in liver was increased only in HMW fractions. Unfractionated kidney cytosolic SeGSHPx activity was decreased 14% by ATG injection, but liver enzyme activity was not changed. However, Sephadex G-150 chromatography showed that total and specific activities, respectively, were decreased 28 and 23% in kidney and 25 and 16% in liver. Au coeluted with HMW and 10,000 Mr 73Se-containing kidney proteins; the latter contained 50% of the Au eluted from the column. DEAE Sephacel chromatography of the 10,000 Mr kidney protein showed that both Au and 75Se were tightly associated with metallothionein-like proteins. This study demonstrates the interaction of Au with rat liver and kidney 75Se-containing proteins.
mesh_terms: D000818:Animals; D006051:Aurothioglucose / Q000494:pharmacology*; D003600:Cytosol / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D006046:Gold / Q000494:pharmacology*; D007668:Kidney / Q000187:drug effects / Q000378:metabolism*; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008970:Molecular Weight; D011506:Proteins / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values; D020887:Selenious Acid; D012643:Selenium / Q000378:metabolism*; D012644:Selenium Radioisotopes
chemical_list: D011506:Proteins; D012644:Selenium Radioisotopes; D006051:Aurothioglucose; D006046:Gold; D005979:Glutathione Peroxidase; D020887:Selenious Acid; D012643:Selenium