title: Hepatocellular transport: role of ATP-binding cassette proteins.
abstract: The interest of mammalian biologists in ATP-binding cassette (ABC) proteins is relatively recent. However, ABC proteins are widespread in distribution and have long been known to play an important transport role in prokaryotes. The review includes a brief overview of the structure, regulation, and varied functions of ABC proteins in different cell types as well as a synopsis of the emerging role of ABC proteins in human biology and disease. The review then focuses on the established (canalicular secretion of organic cations by the multidrug resistance, or MDR 1, gene product; ductular secretion of fluid and electrolytes mediated by CFTR), probable (biliary phospholipid secretion by the MDR 2 gene product; secretion of non-bile acid organic anions by the multidrug resistance protein, or MRP), and possible (bile acid secretion; biliary secretion of the signaling molecule, ATP; hormone transport) roles of known and novel ABC proteins in hepatobiliary secretion.
authors.affiliation: Department of Medicine, University of California, San Francisco, 94143-0538, USA.
authors.forename: N
authors.initials: N
authors.lastname: Lomri
authors.forename: J G
authors.initials: JG
authors.lastname: Fitz
authors.forename: B F
authors.initials: BF
authors.lastname: Scharschmidt
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000502:physiology; D018528:ATP-Binding Cassette Transporters / Q000502:physiology*; D000818:Animals; D001647:Bile Acids and Salts / Q000378:metabolism; D001693:Biological Transport, Active; D019005:Cystic Fibrosis Transmembrane Conductance Regulator / Q000502:physiology; D018432:Drug Resistance, Multiple; D006801:Humans; D008099:Liver / Q000378:metabolism*; D010743:Phospholipids / Q000378:metabolism
chemical_list: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; D001647:Bile Acids and Salts; C505032:CFTR protein, human; D010743:Phospholipids; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; C095122:multidrug resistance protein 3