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Related Concept Videos

Hepatic Drug Excretion: Influencing Factors01:16

Hepatic Drug Excretion: Influencing Factors

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The biliary system of the liver, crucial for bile secretion and drug excretion, comprises intrahepatic bile ducts that merge to form the common hepatic duct. This duct, carrying hepatic bile, combines with the cystic duct, draining the gallbladder and forming the common bile duct, which empties into the duodenum. Bile, produced by hepatic cells lining the bile canaliculi, is composed primarily of water, bile salts, pigments, electrolytes, and lesser amounts of cholesterol and fatty acids. Bile...
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Bile01:19

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Bile is a crucial bodily fluid, characterized by its yellow-green color and alkaline nature. Produced in the liver, it is transported through the common hepatic duct into either the cystic duct, leading to the gallbladder, or directly into the common bile duct. The flow of bile is regulated by the sphincter of Oddi located at the entrance of the duodenum. When this sphincter is closed, bile is redirected to the gallbladder for storage and concentration.
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The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
Metabolic Regulation:
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Pharmaceutical substances known as xenobiotics are predominantly lipophilic and nonionized. This enables them to permeate lipid bilayers, such as cell membranes, and interact with intracellular target receptors. Lipophilic drugs have an advantage in crossing biological barriers and reaching their intended sites of action. However, lipophilic drugs often have a restricted capacity for renal expulsion or elimination from the body. When these drugs enter the kidneys and undergo glomerular...
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Biotransformation, also known as drug metabolism, is a vital physiological process that chemically alters drugs, facilitating their elimination from the body and terminating their action. This process involves two main phases: phase I and phase II reactions. Phase I reactions, including oxidation, reduction, and hydrolysis, introduce or unmask polar functional groups on the drug molecule, thereby increasing its water solubility. By enhancing water solubility, the drug becomes more hydrophilic...
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Enterohepatic cycling involves the active secretion of drugs and their metabolites into the bile via transporters in the canalicular membrane of hepatocytes. This secretion is an integral part of the digestive process, releasing these substances into the gastrointestinal (GI) tract.
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Extrahepatic Bile Duct and Gall Bladder Dissection in Nine-Day-Old Mouse Neonates
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Bile metabolism and lithogenesis.

Kathleen O'Connell1, Karen Brasel2

  • 1Department of Surgery, Medical College of Wisconsin, 9200 West Wisconsin Avenue, Milwaukee, WI 53226, USA.

The Surgical Clinics of North America
|April 1, 2014
PubMed
Summary
This summary is machine-generated.

Bile acids are crucial for digestion and energy, impacting human health and diseases like gallstones. Understanding bile metabolism is key to developing new treatments for gallbladder disease.

Keywords:
BileBile acidsCholelithiasisGallbladderGallstones

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Area of Science:

  • Bile acid metabolism and molecular effects.
  • Human energy metabolism and disease processes.

Background:

  • Bile acids classically aid lipid absorption.
  • Emerging roles in energy metabolism and disease.
  • Cholelithiasis (gallstones) affects many American adults.

Purpose of the Study:

  • To advance understanding of bile metabolism.
  • To explore molecular effects of bile acids.
  • To inform treatments for gallbladder disease.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of molecular mechanisms.
  • Epidemiological data on cholelithiasis.

Main Results:

  • Bile acids have expanded roles beyond lipid absorption.
  • Altered bile metabolism contributes to cholelithiasis.
  • Gallbladder disease has significant health implications.

Conclusions:

  • Further research into bile acid functions is needed.
  • Understanding disease processes can lead to novel therapies.
  • Targeted treatments and prevention for gallstones are priorities.