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Related Concept Videos

Formation of Lipopolysaccharides01:19

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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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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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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
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Factors Promoting Lipopolysaccharide Uptake by Synthetic Lipid Droplets.

Assame Arnob1, Anirudh Gairola1, Hannah Clayton1

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.

Biorxiv : the Preprint Server for Biology
|October 28, 2024
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Synthetic lipid droplets enhance lipopolysaccharide (LPS) removal from blood. Calcium ions significantly boost LPS uptake by these lipoproteins, suggesting a potential sepsis treatment.

Keywords:
CalciumLipopolysaccharideLipopolysaccharide binding proteinLipoproteinSepsisSynthetic lipid droplets

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Area of Science:

  • Biochemistry
  • Biophysics
  • Immunology

Background:

  • Lipoproteins are crucial for clearing lipopolysaccharide (LPS) during bacterial inflammation.
  • LPS uptake by lipoproteins is influenced by lipoprotein properties and environmental factors.

Purpose of the Study:

  • To investigate how physicochemical properties of synthetic lipoproteins affect LPS uptake.
  • To explore the role of environmental factors, including ions, in LPS clearance.

Main Methods:

  • Preparation of synthetic lipid droplets mimicking lipoproteins with varied properties (charge, size, composition).
  • Assessing LPS adsorption onto lipid droplets with and without lipopolysaccharide binding protein (LBP).
  • Evaluating the impact of calcium (Ca2+) and magnesium (Mg2+) ions on LPS uptake.

Main Results:

  • LPS spontaneously adsorbed onto lipid droplets; LBP enhanced this uptake.
  • Positively charged lipid droplets increased the uptake of negatively charged LPS.
  • LPS uptake was highly dependent on Ca2+ concentration, with higher Ca2+ improving uptake, while Mg2+ had minimal effect.

Conclusions:

  • Ca2+ plays a vital role in LPS clearance by lipid droplets.
  • Supplementation with Ca2+ and synthetic lipoproteins may offer a therapeutic strategy for severe sepsis, addressing hypocalcemia and low lipoprotein levels in patients.