Canalicular membrane

The canalicular membrane is the specialized apical membrane domain of hepatocytes forming the boundary of the bile canaliculus. It contains high concentrations of membrane proteins, especially ATP-dependent transporters (ABC transporters such as BSEP/ABCB11, MRP2/ABCC2, MDR3/ABCB4), lipid translocases (e.g., ATP8B1), and mechanosensor proteins (e.g., Piezo-1, α-catenin), along with a dynamic actin cytoskeleton and tight junctions[1][3][4][6][7]. These proteins orchestrate the secretion of bile acids, phospholipids, cholesterol, organic ions, and xenobiotics into the biliary system, maintaining the blood-bile barrier and regulating bile flow and peristalsis[1][3][5]. Mutations or dysfunction of these transporters are associated with cholestatic liver diseases. The canalicular membrane is thus a critical functional platform, but is not itself a drug target; its constituent proteins are.[3][4][6] Caveats: - The "canalicular membrane" is a *membranous compartment*, not a molecule, protein, or classical therapeutic target. - Drug development, mechanistic study, or patient selection focus on specific membrane proteins—especially transporters—localized at the canalicular membrane. - If a request is made for a target, a more appropriate query would be about individual proteins (e.g., "bile salt export pump," "multidrug resistance protein 3") found in this membrane domain. If you require detailed information about a specific *molecular* target within the canalicular membrane (such as BSEP/ABCB11 or MDR3/ABCB4), please specify.

Other names

Bile canalicular membranehepatocyte apical membranecanalicular plasma membrane