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Related Concept Videos

Cell Adhesion in Plants01:14

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Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Glycocalyx and its Functions01:14

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The glycocalyx is a carbohydrate-rich, fuzzy-appearing layer on the outer surface of the cell membrane. It is highly hydrophilic, because of this it attracts large amounts of water to the cell's surface. This aids the cell's interaction with the watery environment and also helps it to obtain substances dissolved in the water. It is also important for cell identification, self/non-self determination, and embryonic development and is used in cell-to-cell attachments to form tissues.
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Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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Related Experiment Video

Updated: Sep 11, 2025

Quantifying the Mechanical Properties of the Endothelial Glycocalyx with Atomic Force Microscopy
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Quantifying the Mechanical Properties of the Endothelial Glycocalyx with Atomic Force Microscopy

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Compressed Cells Facilitate Adhesion Through Glycocalyx.

Xiaole Wang1, Jonne Helenius1, Daniel J Müller1

  • 1Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule (ETH) Zurich, Klingelbergstrasse 48, Basel, 4056, Switzerland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 15, 2025
PubMed
Summary
This summary is machine-generated.

Mammalian cells under mechanical confinement develop strong, unspecific adhesion via their glycocalyx. This mechanism enhances both integrin-mediated and direct cell-extracellular matrix (ECM) interactions, crucial for understanding cell behavior in various biological contexts.

Keywords:
cell adhesion initiationcollagencompressionfibronectinglycocalyxintegrinsingle‐cell force spectroscopy

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biomaterials Science

Background:

  • Mammalian cells exhibit unspecific adhesion under mechanical confinement, independent of integrins.
  • The mechanisms underlying this integrin-independent adhesion are not fully understood.

Purpose of the Study:

  • To investigate how mammalian cells initiate unspecific and integrin-mediated adhesion when exposed to mechanical compression.
  • To elucidate the role of the glycocalyx in cell adhesion under confinement.

Main Methods:

  • Compression of mammalian cells on various substrates (collagen I, fibronectin, and substrates lacking specific binding sites).
  • Analysis of adhesion strength and dynamics under varying compression levels.
  • Microscopic examination to observe cellular structures involved in adhesion.

Main Results:

  • Increasing compression enhances cell adhesion to collagen I and fibronectin and accelerates adhesion strengthening.
  • High compression induces a strong unspecific adhesion state, significantly contributing to cell-extracellular matrix (ECM) adhesion.
  • The glycocalyx directly facilitates strong unspecific adhesion and enhances early integrin-mediated adhesion.

Conclusions:

  • Mammalian cells utilize their glycocalyx to establish robust unspecific adhesion under mechanical confinement.
  • This unspecific adhesion mechanism is critical for cell-ECM interactions and complements integrin-mediated adhesion.
  • Understanding these mechanisms provides insights into cell behavior in development, disease, and biotechnological applications.