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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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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.
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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in adipocytes...
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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...
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...

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Related Experiment Video

Updated: Jun 19, 2026

Analysis of Fluorescent-Stained Lipid Droplets with 3D Reconstruction for Hepatic Steatosis Assessment
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Analysis of Fluorescent-Stained Lipid Droplets with 3D Reconstruction for Hepatic Steatosis Assessment

Published on: June 2, 2023

Fatty liver and lipotoxicity.

Michael Trauner1, Marco Arrese, Martin Wagner

  • 1Laboratory of Experimental and Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Medical University of Graz, Auenbruggerplatz 15, 8036 Graz, Austria. michael.trauner@meduni-graz.at

Biochimica Et Biophysica Acta
|October 28, 2009
PubMed
Summary

Fatty liver disease progression is driven by hepatic lipotoxicity, where the liver

Area of Science:

  • Hepatology and metabolic disease research.

Background:

  • Fatty liver disease encompasses simple steatosis to steatohepatitis, potentially progressing to cirrhosis and liver cancer.
  • Hepatic lipotoxicity occurs when fatty acid metabolism overwhelms the liver's capacity for utilization, storage, and export.
  • Mechanisms include abnormal fatty acid oxidation, altered cell membrane composition, and ceramide signaling disruptions.

Purpose of the Study:

  • To elucidate the role of hepatic lipotoxicity in the pathogenesis and progression of fatty liver disease.
  • To highlight lipotoxicity as a critical factor driving liver damage and disease advancement.

Main Methods:

  • Review and synthesis of current literature on hepatic lipotoxicity mechanisms.
  • Analysis of the impact of lipotoxicity on hepatocellular function and liver pathology.

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A Model of Experimental Steatosis In Vitro: Hepatocyte Cell Culture in Lipid Overload-Conditioned Medium
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A Model of Experimental Steatosis In Vitro: Hepatocyte Cell Culture in Lipid Overload-Conditioned Medium

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Last Updated: Jun 19, 2026

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Main Results:

  • Hepatic lipotoxicity induces hepatocellular death, Kupffer cell activation, and inflammation.
  • Lipotoxicity impairs insulin signaling, leading to insulin resistance.
  • It also promotes fibrogenesis in hepatic stellate cells, contributing to cirrhosis.

Conclusions:

  • Hepatic lipotoxicity is a central mechanism in fatty liver disease progression.
  • Targeting lipotoxicity presents a promising therapeutic strategy for fatty liver disease.