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Related Concept Videos

Lipid Absorption01:24

Lipid Absorption

Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
Hepatic Drug Clearance: Role of Transporters01:14

Hepatic Drug Clearance: Role of Transporters

In the liver and bile canaliculi, influx and efflux transporters modification can influence intrinsic clearance. Transporters play a significant role in moving drugs within liver cells. Elaborate models, such as the Biopharmaceutical Classification System (BCS), are essential to relate transporters to drug disposition. This system categorizes drugs into four classes based on solubility and permeability, providing insights into elimination routes and the effects of transporters following oral...
Carrier-Mediated Transport01:06

Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Hepatic Drug Excretion: Enterohepatic Cycling01:17

Hepatic Drug Excretion: Enterohepatic Cycling

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.
Post-release drugs and metabolites can be reabsorbed into the body from the intestine. For conjugated metabolites like glucuronides, reabsorption requires enzymatic hydrolysis by intestinal microflora. This...
Transcellular Transport of Solutes01:23

Transcellular Transport of Solutes

Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
Hepatic Drug Excretion: Influencing Factors01:16

Hepatic Drug Excretion: Influencing Factors

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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Related Experiment Video

Updated: Jun 13, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

Transintestinal cholesterol efflux.

Astrid E van der Velde1, Gemma Brufau, Albert K Groen

  • 1Academic Medical Center, AMC Liver Center, Amsterdam, The Netherlands.

Current Opinion in Lipidology
|April 23, 2010
PubMed
Summary

The intestine actively excretes cholesterol through transintestinal cholesterol efflux (TICE), a key process in maintaining cholesterol balance. This pathway in the small intestine is crucial for regulating body cholesterol levels and may offer therapeutic targets.

Area of Science:

  • Metabolic regulation
  • Cholesterol homeostasis
  • Gastrointestinal physiology

Background:

  • Cholesterol homeostasis involves complex metabolic pathways across multiple organs.
  • The liver has been the primary focus of research in cholesterol regulation.
  • The intestine's role in cholesterol transport is an emerging area of study.

Purpose of the Study:

  • To review recent advancements in understanding the intestine's role in cholesterol transport.
  • To highlight the significance of the intestine in cholesterol homeostasis.
  • To discuss emerging pathways of intestinal cholesterol excretion.

Main Methods:

  • Literature review of recent research on intestinal cholesterol transport.
  • Analysis of studies investigating cholesterol excretion mechanisms in the small intestine.

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High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay
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High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay

Published on: January 7, 2019

The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
06:14

The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion

Published on: November 30, 2022

Related Experiment Videos

Last Updated: Jun 13, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay
08:18

High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay

Published on: January 7, 2019

The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
06:14

The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion

Published on: November 30, 2022

  • Examination of evidence for active cholesterol secretion pathways.
  • Main Results:

    • Significant progress has been made in understanding intestinal cholesterol excretion systems.
    • The proximal small intestine actively secretes cholesterol via transintestinal cholesterol efflux (TICE).
    • In mice, TICE accounts for up to 70% of fecal neutral sterol excretion.

    Conclusions:

    • The small intestine plays a critical role in regulating body cholesterol homeostasis.
    • Active absorption and excretion processes, including TICE, are key to sterol regulation in the intestine.
    • TICE presents a potential therapeutic target for reducing atherosclerosis.