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Am J Physiol Gastrointest Liver Physiol 275: G1179-G1184, 1998;
0193-1857/98 $5.00
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Vol. 275, Issue 5, G1179-G1184, November 1998

Capillary diffusion capacity and tissue distribution of pancreatic procolipase in rat

Catarina Rippe1, Bengt Rippe2,3, and Charlotte Erlanson-Albertsson1

1 Section for Molecular Signaling, Departments of Cell and Molecular Biology and 2 Nephrology and 3 Physiology, University of Lund, S-221 00 Lund, Sweden

The permeability-surface area product of procolipase and its apparent distribution volume in rat tissues were assessed using a tissue uptake technique. Procolipase was investigated together with 51Cr-EDTA, used as an inert extracellular marker, and 131I-albumin, used as a plasma volume marker. The tissue uptake of procolipase seemed to occur by passive transport in most of the organs studied, such as in muscle, liver, lung, adipose tissue, adrenal glands, colon, and skin. However, throughout the gastrointestinal tract, except in the colon, there was a high uptake of procolipase, greatly exceeding that of 51Cr-EDTA. This was especially evident in the stomach, in which the procolipase uptake was nonsaturable within the experimental period. Also, in the central nervous system (CNS), there was evidence of specific, possibly carrier-mediated, transport. These results suggest that procolipase may have specific, conceivably receptor-mediated, transport pathways across the microvascular endothelium in the stomach, pancreas, duodenum, ileum, and the CNS.

tissue uptake technique; blood-brain barrier; gastrointestinal tract; colipase


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