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The Biliary System (Paperback, 2nd Revised edition)
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The Biliary System (Paperback, 2nd Revised edition)
Series: Colloquium Series on Integrated Systems Physiology: From Molecule to Function
Expected to ship within 10 - 15 working days
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The liver is a vital organ involved in numerous metabolic processes
such as cholesterol and bile acid metabolism, biliary lipid
secretion, and bile formation. Cholesterol balance across the liver
has a crucial effect on influencing plasma total and LDL
cholesterol levels and biliary cholesterol concentrations.
Cholesterol and bile acid biosyntheses are primarily modulated by
negative feedback regulatory mechanisms through the sterol
regulatory element-binding protein isoform 2 (SREBP-2) and the
farnesoid X receptor (FXR) pathways, respectively. The conversion
of cholesterol to bile acids in the liver can balance the fecal
excretion of bile acids, which is an important route for the
removal of cholesterol from the body. Bile formation begins in the
bile canaliculi, and maintenance of the enterohepatic circulation
of bile acids results in a continuous secretion of bile. Hepatic
secretion of biliary lipids is determined mainly by a group of
ATP-binding cassette (ABC) transporters that are located on the
canalicular membrane of hepatocytes, which are regulated by various
nuclear receptors. Bile acids promote bile flow by their osmotic
effects. Also, they are essential for the intestinal absorption of
cholesterol, fatty acids, and fat-soluble vitamins and play an
important role in aiding the digestion of dietary fat. Bile acids
function as signaling molecules and anti-inflammatory agents to
regulate lipid, glucose, and energy metabolism by rapidly
activating nuclear receptors and cell signaling pathways. This
eBook summarizes the progress in the molecular and cellular
mechanisms of cholesterol and bile acid metabolism and the
physical-chemistry of biliary lipids, with emphasis on biliary
lipid metabolism that is regulated by nuclear receptors in the
hepatobiliary system.
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