title: The fate of 131 I-labelled human pancreatic elastase after intraduodenal administration.
abstract: Human pancreatic elastase labelled with 131 I was administered into the duodenum through the fiberoptic gastro-duodenoscope in eight persons. Radioactivity was measured in their plasma, urine and feces during 72 h. 131 I was present in the plasma in a dialyzable form 15 min after administration in all but one person. In one case labelled elastase bound by alpha1-antitrypsin and alpha2-macroglobulin was recovered from plasma indicating absorption of elastase from the intestine. In all individuals most of the radioactivity (28 - 73%) was recovered in the urine. Their feces contained low amounts of labelled substance (0.9 - 7.0%), except in two individuals where large amounts of radioactivity were found in the feces of one person with diarrhoea (43%) and of another, who received oral treatment with antibiotics two months previously (22%). In the latter case endogenous elastase was also present in feces in considerable amounts.
mesh_terms: D000368:Aged; D004386:Duodenum / Q000378:metabolism*; D005243:Feces / Q000032:analysis; D006801:Humans; D008875:Middle Aged; D010179:Pancreas / Q000201:enzymology; D010196:Pancreatic Elastase / Q000097:blood / Q000378:metabolism* / Q000652:urine; D011863:Radioimmunoassay
chemical_list: D010196:Pancreatic Elastase