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Related Concept Videos

Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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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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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
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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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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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Membrane Fluidity01:26

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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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Single-Particle Analysis Reveals Heterogeneity in Membrane Coating.

Tianchang He1,2,3, Wenhua Zheng1,2,3, Lina Zhu1,2,3

  • 1Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, P. R. China.

Small Methods
|February 27, 2026
PubMed
Summary

Developing biomimetic nanocarriers with cell membranes is key for drug delivery. A new method, Single-Particle Analysis of CEll MembrANe (SPACEMAN), accurately measures coating uniformity and improves nanocarrier performance.

Keywords:
biomimetic nanoparticlesimmune evasionnano‐flow cytometryprolonged blood circulationsingle‐particle analysis

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Materials Science

Background:

  • Cell membrane coating of nanoparticles creates biomimetic nanocarriers with enhanced properties like immune evasion and circulation.
  • Challenges exist in achieving uniform, scalable membrane coating and quantifying coating degree at the single-particle level.

Purpose of the Study:

  • To establish a quantitative platform, Single-Particle Analysis of CEll MembrANe (SPACEMAN), for evaluating nanoparticle membrane coating integrity and heterogeneity.
  • To compare different coating methods and identify an optimal strategy for biomimetic nanocarrier development.

Main Methods:

  • Development and application of the SPACEMAN platform for single-nanoparticle analysis.
  • Comparative assessment of nano-vesiculation via ultrasonication, extrusion, and sonication for cell membrane coating.
  • Evaluation of nanoparticle immune evasion and circulation in vitro and in vivo.

Main Results:

  • SPACEMAN provides accurate, single-nanoparticle resolution of coating integrity and heterogeneity.
  • Nano-vesiculation via ultrasonication achieved a higher overall coating rate (82.2%) compared to extrusion (68.0%) and sonication (61.0%).
  • Ultrasonication resulted in a greater proportion of nanoparticles with high surface coverage and demonstrated superior immune evasion and prolonged circulation.

Conclusions:

  • SPACEMAN is a generalizable analytical framework for quantifying nanoparticle coating heterogeneity.
  • Optimized nano-vesiculation via ultrasonication enhances biomimetic nanocarrier performance.
  • This platform facilitates the development of advanced nanocarriers with improved drug delivery capabilities.