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Biliary excretion of sulfobromophthalein compounds in normal and mutant corriedale sheep. Evidence for a disproportionate transport defect for conjugated sulfobromophthalein
Author(s) -
Barnhart James L.,
Gronwall Ronald R.,
Combes Burton
Publication year - 1981
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.1840010513
Subject(s) - sulfobromophthalein , excretion , medicine , endocrinology , excretory system , chemistry , corriedale , glutathione , biology , biochemistry , liver function tests , zoology , enzyme
Biliary excretion of dye was evaluated in three normal and one mutant Corriedale sheep (characterized by depressed biliary transport of many organic anions) during infusion of unconjugated sulfobromophthalein (BSP) and its preformed glutathione conjugate (BSP‐GSH). Maximal dye excretion rates in bile in normal sheep were higher when BSP‐GSH rather than BSP was administered. In confirmation of earlier studies, dye excretion in bile was markedly depressed in the mutant animal. However, movement of unconjugated BSP from liver cells into bile remained relatively intact whereas transport of conjugated BSP compounds was virtually absent. Preservation of unconjugated dye entry into bile suggests the presence of a transport mechanism for unconjugated BSP which is preserved in mutant sheep and is distinct from that involved in BSP‐GSH excretory transport. Renal clearance of conjugated BSP compounds was greater than of unconjugated BSP and clearance values were comparable in the normal and mutant sheep. Thus, no excretory defect comparable to that present in liver was identifiable in the kidney.