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Related Concept Videos

Factors Affecting Protein-Drug Binding: Drug Interactions01:23

Factors Affecting Protein-Drug Binding: Drug Interactions

Drug interactions are a critical aspect of pharmacology and can occur when two or more drugs compete for the same binding site. This competition can result in one drug displacing another, altering the effect of the displaced drug. Drug interactions are complex processes that rely heavily on how much of the displacer drug is present and how strongly it can bind to the same sites as the displaced drug.
Displacement interactions can have varying outcomes, ranging from toxicity to virtually...
Factors Affecting Protein-Drug Binding: Drug-Related Factors01:18

Factors Affecting Protein-Drug Binding: Drug-Related Factors

Drug binding to proteins is a complex phenomenon influenced by various drug-related factors, each playing a significant role in the interaction between drugs and proteins within the body.
One crucial factor in drug-protein binding is the drug's lipophilicity or its affinity for fat. More lipophilic drugs tend to have higher binding extents. For example, highly lipophilic drugs like cloxacillin exhibit substantial protein binding, with as much as 95% of the drug binding to proteins. In contrast,...
Drug Binding to Blood Components01:30

Drug Binding to Blood Components

When drugs enter systemic circulation, they interact with various components of the blood, including proteins such as human serum albumin (HSA), α1-acid glycoprotein (AAG), lipoproteins, globulins, and red blood cells (RBCs).
HSA is the most abundant plasma protein and is vital in drug binding. It contains distinct drug-binding sites, with different drugs exhibiting affinity for specific sites. There are three main drug-binding domains for HSA: sites I, II, and III. These domains are further...
Factors Affecting Protein-Drug Binding: Protein-Related Factors01:20

Factors Affecting Protein-Drug Binding: Protein-Related Factors

Drug binding to proteins is a key aspect of pharmacokinetics and can influence a drug's distribution, absorption, and elimination in the body. Several factors, including the drug's physiochemical properties, protein concentration, disease states, and the number of binding sites on the protein, influence this process.
The physicochemical properties of a drug play a significant role in its ability to bind to proteins. Lipophilic drugs, which dissolve in fats, oils, and lipids, can be bound by...
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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%...
Lipid-derived Compounds in the Human Body01:31

Lipid-derived Compounds in the Human Body

Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various  biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...

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Differential Effects of Lipid-lowering Drugs in Modulating Morphology of Cholesterol Particles
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Published on: November 10, 2017

Interactions between lipid A and serum proteins.

Jörg Andrä1, Thomas Gutsmann, Mareike Müller

  • 1Biophysics Division, Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Parkallee 10, 23845 Borstel, Germany. jandrae@fz-borstel.de

Advances in Experimental Medicine and Biology
|July 29, 2010
PubMed
Summary

Serum proteins interact with endotoxin (lipopolysaccharide or lipid A), influencing sepsis and septic shock. These interactions can either enhance or reduce immune cell activation, or aid in endotoxin detoxification and elimination.

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Differential Effects of Lipid-lowering Drugs in Modulating Morphology of Cholesterol Particles
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Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein

Published on: October 12, 2017

Area of Science:

  • Biochemistry
  • Immunology
  • Microbiology

Background:

  • Endotoxins, specifically lipopolysaccharide (LPS) and lipid A, are key triggers of sepsis and septic shock.
  • Serum proteins exhibit diverse interactions with endotoxins, leading to varied pathophysiological outcomes.
  • Existing research often uses variable endotoxin sources and focuses on LPS rather than the active lipid A component.

Purpose of the Study:

  • To review the interactions between serum proteins and endotoxins.
  • To summarize research on proteins involved in endotoxin-mediated immune cell activation.
  • To discuss proteins responsible for endotoxin detection, transport, and neutralization.

Main Methods:

  • Literature review focusing on studies investigating endotoxin-serum protein interactions.
  • Analysis of proteins involved in immune cell activation, immunoglobulin detection, endotoxin transport, and neutralization.
  • Inclusion of studies using both LPS and lipid A, acknowledging potential differences.

Main Results:

  • Serum proteins play multifaceted roles, including enhancing or attenuating endotoxin-induced immune responses.
  • Specific proteins are involved in detecting endotoxins via immunoglobulins and facilitating their transport.
  • Various proteins and peptides demonstrate the capacity to neutralize the biological effects of endotoxins.

Conclusions:

  • The interaction of serum proteins with endotoxins is complex and significantly impacts sepsis pathogenesis.
  • Understanding these interactions is crucial for developing therapeutic strategies against endotoxin-mediated diseases.
  • Further research using chemically defined endotoxin structures is needed to clarify specific protein interactions.