Capillary diffusion capacity and tissue distribution of pancreatic procolipase in rat.
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.
Rippe
C
C
Section for Molecular Signaling, Departments of Cell and Molecular Biology, University of Lund, S-221 00 Lund, Sweden.
Rippe
B
B
Erlanson-Albertsson
C
C
D000818:Animals; D002196:Capillaries / Q000502:physiology*; D002860:Chromium Radioisotopes / Q000493:pharmacokinetics; D003089:Colipases / Q000097:blood / Q000493:pharmacokinetics*; D004492:Edetic Acid / Q000493:pharmacokinetics; D004792:Enzyme Precursors; D007457:Iodine Radioisotopes / Q000493:pharmacokinetics; D008297:Male; D010953:Plasma Volume; D011498:Protein Precursors / Q000097:blood / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D012709:Serum Albumin / Q000378:metabolism; D013997:Time Factors; D014018:Tissue Distribution
D002860:Chromium Radioisotopes; D003089:Colipases; D004792:Enzyme Precursors; D007457:Iodine Radioisotopes; D011498:Protein Precursors; D012709:Serum Albumin; C037107:procolipase; D004492:Edetic Acid