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Biosynthesis of Lipids01:29

Biosynthesis of Lipids

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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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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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Lipid Index Determination by Liquid Fluorescence Recovery in the Fungal Pathogen Ustilago Maydis
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The Flexibility of Ectopic Lipids.

Hannah Loher1, Roland Kreis2, Chris Boesch3

  • 1Division of Endocrinology, Diabetes and Clinical Nutrition, Inselspital, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland. hannah.loher@bluewin.ch.

International Journal of Molecular Sciences
|September 21, 2016
PubMed
Summary

Ectopic lipids, stored in non-fat tissues like muscle and liver, are flexible fuel sources. Their storage and depletion are influenced by diet, exercise, and insulin resistance, with timing being crucial.

Keywords:
athlete’s paradoxdiabetes mellitusectopic lipidsexercisefastinggrowth hormone deficiencyinsulin resistanceintracardiomyocellular lipidsintrahepatocellular lipidsintramyocellular lipids

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Area of Science:

  • Metabolism
  • Physiology
  • Biochemistry

Background:

  • Lipids are stored not only in adipose tissue but also ectopically in hepatocytes (intrahepatocellular lipids; IHCL), skeletal muscle (intramyocellular lipids; IMCL), and cardiac muscle (intracardiomyocellular lipids; ICCL).
  • Ectopic lipid stores are dynamic, influenced by diet and physical activity, and are linked to metabolic health conditions like obesity and insulin resistance.
  • Traditional methods for quantifying IMCL, such as muscle biopsies, are invasive, limiting repeated assessments.

Purpose of the Study:

  • To review the current understanding of ectopic lipid flexibility.
  • To highlight the role of non-invasive techniques like proton magnetic resonance spectroscopy (¹H-MRS) in assessing ectopic lipids.
  • To discuss the factors influencing the dynamic regulation of ectopic lipid stores.

Main Methods:

  • Review of existing literature on ectopic lipid metabolism and quantification.
  • Focus on ¹H-magnetic resonance spectroscopy (¹H-MRS) as a non-invasive tool for assessing IMCL, IHCL, and ICCL.
  • Analysis of factors affecting ectopic lipid dynamics, including diet, exercise, and insulin action.

Main Results:

  • Ectopic lipids serve as flexible fuel reserves that can be mobilized by exercise and replenished by dietary intake.
  • ¹H-MRS is a validated, non-invasive method for quantifying IMCL, IHCL, and ICCL, enabling repeated measurements.
  • The flexibility of ectopic lipids is modulated by a complex interaction of diet (quantity and quality), fat availability, insulin sensitivity, and physical activity.

Conclusions:

  • The dynamic nature of ectopic lipids is influenced by diet, exercise, and insulin action, with short-term versus long-term interventions yielding different outcomes.
  • Standardization of dietary and physical activity protocols is essential for consistent assessment of ectopic lipids in clinical research.
  • Understanding ectopic lipid flexibility is crucial for metabolic health and managing conditions associated with obesity and insulin resistance.