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Related Concept Videos

Adherens Junctions01:24

Adherens Junctions

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
The endothelial cells...
Cell Adhesion Molecules - Types and Functions01:20

Cell Adhesion Molecules - Types and Functions

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).
CAM Families
The Integrin family of proteins is primarily  involved in a...
Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

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...
Anchoring Junctions01:03

Anchoring Junctions

Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
Cadherins in Tissue Organization01:19

Cadherins in Tissue Organization

The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...

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Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation
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Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation

Published on: January 20, 2018

Cell interactions with hierarchically structured nano-patterned adhesive surfaces.

Marco Arnold1, Marco Schwieder, Jacques Blümmel

  • 1Max-Planck Institute for Metals Research, Dept. of New Materials and Biosystems & University of Heidelberg, Dept. of Biophysical Chemistry, Heisenbergstr. 3, D-70569 Stuttgart, Germany. spatz@mf.mpg.de ; ; Tel: +49 711 689 3610.

Soft Matter
|June 21, 2011
PubMed
Summary
This summary is machine-generated.

Understanding cell adhesion requires knowing the minimum activated integrins for focal adhesion formation. This study reveals that at least 6 RGD-coated nanoparticles are needed, with larger patterns promoting classical focal adhesions.

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Last Updated: May 31, 2026

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation
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Published on: January 20, 2018

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy
12:26

Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy

Published on: January 29, 2022

Area of Science:

  • Cell Biology
  • Biomaterials Science
  • Nanotechnology

Background:

  • Cell adhesion is mediated by integrin molecules binding to extracellular matrix components.
  • Focal adhesions are crucial cellular structures that link the extracellular matrix to the actin cytoskeleton.
  • Controlling the number and arrangement of adhesion sites is key to understanding cell-matrix interactions.

Purpose of the Study:

  • To determine the minimum number of activated integrins required for focal adhesion formation.
  • To investigate how nanopattern geometry influences focal adhesion development.
  • To elucidate the role of specific peptide-functionalized nanoparticles in cell adhesion.

Main Methods:

  • Utilized a combination of micellar and electron beam lithography to create micro-nanopatterned surfaces.
  • Engineered surfaces with precisely controlled densities of 6 nm gold nanoparticles functionalized with c(RGDfK)-thiol peptides.
  • Passivated non-adhesive areas to ensure specific cell attachment to nanopatterned regions.

Main Results:

  • Focal adhesion formation was dependent on the underlying nanopattern geometry and nanoparticle density.
  • Larger adhesive patches (3000 nm and 1000 nm) with higher nanoparticle counts induced classical focal adhesions.
  • Smaller patches (≤500 nm) led to increased paxillin domain length, suggesting compensatory strengthening mechanisms.
  • A minimum of 6 functionalized gold nanoparticles per site was necessary for any paxillin accumulation or adhesion formation.

Conclusions:

  • The number and spatial arrangement of activated integrins, controlled by nanopatterning, dictate focal adhesion formation and maturation.
  • Cells can adapt to limited adhesion sites by mechanically strengthening individual adhesions.
  • This work provides critical insights into the quantitative requirements for initiating cell adhesion and focal adhesion assembly.