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- Title
Metabolism of 125I-labelled trypsin in man: evidence of recirculation.
- Authors
Lake-Bakaar, G; Rubio, C E; McKavanagh, S; Potter, B J; Summerfield, J A
- Abstract
125I-labelled human trypsin metabolism has been investigated in man. Three subjects received 125I-trypsin and 131I-albumin intravenously. Against a background secretin infusion (1 U/kg/h), trypsin decayed biexponentially from the serum with half-lives of 17.5, 21, and 24 minutes for the rapid disappearance phase and 520, 540, and 560 minutes for the slow phase. Between 13% and 38% of the 125I injected was recovered from duodenal juice aspirated continously over 300 minutes. In contrast, less than 1% of the 131I-albumin injected was recovered. When bile and pure pancreatic juice were collected at endoscopic retrograde cholangiopancreatography after intravenous 125I-trypsin in a fourth subject 125I radioactivity was found to be secreted via both these routes. After 125I-trypsin infusion into the duodenum 11% of the total dose was found to be present in the circulation after 75 minutes. These results support the concept that recirculation of trypsin exists in man.
- Publication
Gut, 1980, Vol 21, Issue 7, p580
- ISSN
0017-5749
- Publication type
Journal Article
- DOI
10.1136/gut.21.7.580