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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...
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.
Absorption of Nutrients01:19

Absorption of Nutrients

Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
Factors Influencing Drug Absorption: Anatomical Parameters01:23

Factors Influencing Drug Absorption: Anatomical Parameters

Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
Bioavailability Enhancement: Drug Permeability Enhancement01:27

Bioavailability Enhancement: Drug Permeability Enhancement

After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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...

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Related Experiment Video

Updated: Jun 26, 2026

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

Intestinal lipid absorption.

Jahangir Iqbal1, M Mahmood Hussain

  • 1Dept. of Anatomy, 450 Clarkson Ave., State University of New York Downstate Medical Center, Brooklyn, NY 11203, USA. jahangir.iqbal@downstate.edu

American Journal of Physiology. Endocrinology and Metabolism
|January 23, 2009
PubMed
Summary

New insights reveal how dietary fats and fat-soluble vitamins are absorbed by enterocytes and transported. Understanding these lipid absorption mechanisms may lead to drugs for lowering cholesterol and reducing cardiovascular disease risk.

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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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Published on: October 13, 2019

Area of Science:

  • Gastroenterology and Nutrition
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Dietary fat and fat-soluble vitamin absorption is crucial for health.
  • Mechanisms of lipid uptake and transport in enterocytes are complex.
  • Previous knowledge on lipid processing has been significantly expanded.

Purpose of the Study:

  • To detail the advanced understanding of dietary lipid and fat-soluble vitamin uptake and transport.
  • To elucidate novel and known mechanisms involved in enterocyte lipid processing.
  • To explore the potential of targeting lipid absorption for therapeutic interventions.

Main Methods:

  • Review and synthesis of recent research findings on lipid absorption.
  • Identification of key proteins and pathways involved in enterocyte lipid metabolism.
  • Analysis of mechanisms for lipoprotein assembly and secretion.

Main Results:

  • Detailed characterization of fatty acid uptake via protein-mediated and independent processes.
  • Clarification of cholesterol uptake regulation by NPC1L1, ABCG5, and ABCG8.
  • Identification of novel pathways for secretion of cholesterol, phospholipids, and vitamin E in lipoproteins.

Conclusions:

  • Significant advancements have been made in understanding enterocyte lipid handling.
  • Key proteins like apoB and MTP are vital for lipoprotein assembly and secretion.
  • Further research into lipid absorption pathways may yield new treatments for hypercholesterolemia and cardiovascular disease.