title: Relationship between bile flow and Na+, K+-adenosinetriphosphatase in liver plasma membranes enriched in bile canaliculi.
abstract: The relationship between bile flow and Na+,K+-ATPase activity in liver plasma membranes enriched in bile canaliculi was studied in rats treated with ethinyl estradiol, phenobarbital, or 20-methyl cholanthrene. In comparison with controls (1.49+/-0.12 microliter/min per g liver), bile flow was significantly diminished by ethinyl estradiol, increased by phenobarbital, and unchanged by 20-methyl cholanthrene or the solvent, propanediol (0.92+/-0.31, 2.50+/-0.21, 1.62+/-0.18, and 1.64+/-0.30 microliter/min per g liver, respectively). The corresponding values for canalicular Na+,K+-ATPase activity were 80.7+/-19.2, 50.0+/-18.4, 231.7+/-42.6, 82.7+/-30.7, and 143.6+/-55.3 micronmol Pi/h per g liver. Canalicular Na+,K+-ATPase activity was significantly correlated (r=0.785, n=31) with bile flow. These findings support the hypothesis that a fraction of bile flow is related to Na+,K+-ATPase activity and canalicular Na+ transport.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000818:Animals; D001646:Bile / Q000502:physiology*; D001835:Body Weight; D002462:Cell Membrane / Q000201:enzymology; D004789:Enzyme Activation; D004997:Ethinyl Estradiol / Q000494:pharmacology; D005704:Gallbladder / Q000378:metabolism / Q000648:ultrastructure; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D008854:Microscopy, Electron; D009929:Organ Size; D010634:Phenobarbital / Q000494:pharmacology; D011188:Potassium / Q000378:metabolism; D011409:Propylene Glycols / Q000494:pharmacology; D051381:Rats; D012964:Sodium / Q000378:metabolism
chemical_list: D011409:Propylene Glycols; D004997:Ethinyl Estradiol; D008748:Methylcholanthrene; D012964:Sodium; D000251:Adenosine Triphosphatases; D011188:Potassium; D010634:Phenobarbital