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Related Concept Videos

Fats as Energy Storage Molecules01:06

Fats as Energy Storage Molecules

Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm. The resulting fatty acids are oxidized by β-oxidation into acetyl-CoA, which is used by the Krebs cycle. The glycerol that is released from triglycerides after lipolysis directly...
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...
Overview of Lipid Metabolism01:24

Overview of Lipid Metabolism

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...
Lipid Catabolism01:25

Lipid Catabolism

Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
Lipid Digestion01:06

Lipid Digestion

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.
Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...

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Related Experiment Video

Updated: May 28, 2026

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro
09:41

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro

Published on: March 17, 2023

Gut triglyceride production.

Xiaoyue Pan1, M Mahmood Hussain

  • 1Department of Cell Biology, SUNY Downstate Medical Center, 450 Clarkson Ave., Brooklyn, NY 11203, USA. Xiaoyue.Pan@downstate.edu

Biochimica Et Biophysica Acta
|October 13, 2011
PubMed
Summary

Dietary fats, or triacylglycerols (TAG), are broken down and absorbed by the intestines. This review details the proteins and pathways involved in fatty acid uptake, triglyceride synthesis, and chylomicron secretion.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Lipid Metabolism

Background:

  • Dietary triacylglycerols (TAG) are essential nutrients absorbed through the intestinal epithelium.
  • Recent advances have elucidated the complex molecular mechanisms governing dietary lipid absorption and metabolism.

Purpose of the Study:

  • To review the key proteins and pathways involved in dietary fatty acid uptake and intracellular transport.
  • To discuss the synthesis of TAG and their packaging into chylomicrons (CM) within enterocytes.
  • To highlight factors regulating intestinal triglyceride production and CM secretion, with a brief overview of cholesterol absorption.

Main Methods:

  • Literature review focusing on molecular and cellular mechanisms of lipid absorption.
  • Analysis of protein functions in fatty acid uptake, TAG resynthesis, and CM assembly.

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A Fluorescence-based Assay for Characterization and Quantification of Lipid Droplet Formation in Human Intestinal Organoids
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A Fluorescence-based Assay for Characterization and Quantification of Lipid Droplet Formation in Human Intestinal Organoids

Published on: October 13, 2019

Related Experiment Videos

Last Updated: May 28, 2026

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro
09:41

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro

Published on: March 17, 2023

A Fluorescence-based Assay for Characterization and Quantification of Lipid Droplet Formation in Human Intestinal Organoids
10:12

A Fluorescence-based Assay for Characterization and Quantification of Lipid Droplet Formation in Human Intestinal Organoids

Published on: October 13, 2019

  • Synthesis of current knowledge on CM intracellular transport and secretion.

    • Main Results:

    • Detailed description of the hydrolysis of dietary TAG to free fatty acids (FFA) and monoacylglycerols (MAG).
    • Identification of key proteins facilitating FFA/MAG uptake and intracellular trafficking to the endoplasmic reticulum (ER).
    • Explanation of TAG resynthesis in the ER and assembly into CM, followed by transport to the Golgi and basolateral secretion.

    Conclusions:

    • Intestinal absorption and metabolism of dietary TAG involve a coordinated series of protein-mediated steps.
    • Understanding these pathways is crucial for addressing disorders of lipid metabolism and related diseases.
    • This review consolidates current knowledge on intestinal lipid processing and secretion.