MD: Distribution, turnover and mechanism of renal excretion of amylase in the baboon

creata and parotid glands of the baboon, an animal which has a serum amylase level and renal clearance of amylase (CAm) similar to man. After bolus injection, both pancreatic and salivary amylase rapidly disappeared from the serum in a monoexponential fashion with a mean serum half-time of approximately 83 min. Only about 24 % of the amylase cleared from the serum ap-peared in the urine indicating that the majority of amylase was removed from the serum by an extra-urinary mechanism. The CA. by the kidney was constant over a wide range of serum amylase levels and the ratio of CAm/CI, which averaged 3.0%, was not influ-enced by mannitol diuresis. This suggests that the renal excretion of amylase results from glomerular filtration without appreciable tubular reabsorption. Pancreatic amylase was consistently cleared more rapidly by the kidney than was the baboon's endogenous amylase while salivary amylase was consistently cleared less rapidly than endogenous amylase. The findings in this study provide insight into several of the following clinically observed phenomena: (a) the short serum half-time of atpylase accounts for the tran-sient nature of serum amylase elevations in pancreatitis; (b) the extra-urinary removal of amylase accounts for the maintenance of relatively normal amylase levels in uremia; and (c) the more rapid renal clearance of pancreatic amylase compared to salivary amylase may explain the disproportionate elevation of the urinary amylase excretion rate relative to the serum amylase level in acute pancreatitis