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Related Concept Videos

Lipid Absorption01:24

Lipid Absorption

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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...
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Lipid Digestion01:06

Lipid Digestion

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Lipids are large molecules that are generally not water-soluble. Since most of the digestive enzymes in the human body are water-based, there are specific steps the body must take to break down lipids and make them available for use.
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Overview of Lipid Metabolism01:24

Overview of Lipid Metabolism

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Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...
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Lipid-derived Compounds in the Human Body01:31

Lipid-derived Compounds in the Human Body

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Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various  biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin,...
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Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Related Experiment Video

Updated: May 1, 2026

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

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Intestinal lipid absorption and lipoprotein formation.

M Mahmood Hussain1

  • 1aDepartment of Cell Biology bDepartment of Pediatrics, SUNY Downstate Medical Center cVA New York Harbor Healthcare System, Brooklyn, New York, USA.

Current Opinion in Lipidology
|April 23, 2014
PubMed
Summary

Dietary fat absorption occurs via two pathways: chylomicrons and high-density lipoproteins (HDLs). These pathways, regulated independently, are crucial for managing various metabolic disorders.

Area of Science:

  • Gastroenterology and Hepatology
  • Lipid Metabolism
  • Molecular Biology

Background:

  • Dietary fat digestion and absorption are complex processes involving multiple steps within the intestinal enterocytes.
  • Lipids are processed and either secreted or stored, with distinct mechanisms governing their transport.

Purpose of the Study:

  • To review and summarize the current evidence on the existence and regulation of two primary lipid absorption pathways.
  • To elucidate the roles of specific proteins, such as MTP and ABCA1, in these pathways.

Main Methods:

  • Review of existing scientific literature and gene-ablation studies.
  • Analysis of lipid transport mechanisms involving chylomicrons and HDLs.

Main Results:

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The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
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A Fluorescence-based Assay for Characterization and Quantification of Lipid Droplet Formation in Human Intestinal Organoids
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Using Caco-2 Cells to Study Lipid Transport by the Intestine
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Using Caco-2 Cells to Study Lipid Transport by the Intestine

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  • Two distinct lipid absorption pathways exist: the chylomicron pathway (dependent on MTP) and the HDL pathway (dependent on ABCA1).
  • Triglyceride absorption is critically dependent on MTP and the chylomicron pathway.
  • Phospholipids, cholesterol, and vitamin E are absorbed via both chylomicron and HDL pathways.
  • Chylomicron secretion is influenced by fatty acid availability, while the HDL pathway is upregulated by liver X receptor agonists.

Conclusions:

  • Triglycerides are exclusively transported via chylomicrons, a process reliant on MTP.
  • HDLs play a significant role in absorbing phospholipids, cholesterol, retinol, and vitamin E, complementing the chylomicron pathway.
  • These two pathways are independently regulated and offer potential therapeutic targets for metabolic diseases like hyperlipidemia and obesity.