Related Experiment Video
Updated: Aug 8, 2026
08:15
Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
Published on: October 17, 2014
Regulative mechanisms of chondrocyte adhesion
Hagen Schmal1, Alexander T Mehlhorn, Miriam Fehrenbach
1Department of Orthopedics and Traumatology, University of Freiburg Medical Center, Freiburg, Germany. hagen.schmal@freenet.de
Tissue Engineering
|May 6, 2006
Summary
Chondrocyte differentiation status significantly impacts their adhesion to matrix proteins, crucial for cartilage tissue engineering. Basic fibroblast growth factor (bFGF) enhances chondrocyte attachment and proliferation.
Area of Science:
- Biomaterials Science
- Cell Biology
- Tissue Engineering
Background:
- Cell-matrix interactions are vital for matrix-associated chondrocyte transplantation.
- Understanding chondrocyte differentiation's effect on adhesion is key for graft development.
Purpose of the Study:
- To investigate how chondrocyte differentiation status influences cellular attachment to extracellular matrix components.
- To evaluate the role of basic fibroblast growth factor (bFGF) in chondrocyte adhesion and proliferation.
Main Methods:
- Monolayer culture of chondrocytes to assess adhesion changes over time and passages.
- Development of a collagen type I scaffold for cartilage construct creation.
- Confocal laser microscopy to visualize cell-matrix interactions and collagen type II expression.
- Treatment with basic fibroblast growth factor (bFGF) to assess its impact on adhesion and proliferation.
Main Results:
- Chondrocyte adhesion to collagen type II increased initially but decreased after dedifferentiation (second passage).
- Dedifferentiated chondrocytes showed increased adhesion to fibrinogen and fibronectin.
- A collagen type I scaffold effectively immobilized over 80% of cells via adhesion, filtration, and entrapment.
- bFGF treatment enhanced chondrocyte adhesion to collagen types I and II, fibronectin, and fibrinogen, promoting proliferation.
Conclusions:
- Chondrocyte adhesion is dependent on differentiation status, influencing cartilage engineering strategies.
- Matrix design must accommodate amplified cells, considering adhesion dynamics.
- bFGF is a key regulator of chondrocyte attachment and proliferation, offering potential therapeutic benefits in cartilage repair.
Related Concept Videos
01:24Overview 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...
01:13Cell-matrix's Response to Mechanical Forces
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
01:20Cell 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...
CAM Families
The Integrin family of proteins is primarily involved in a...
01:20Cell 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...
CAM Families
The Integrin family of proteins is primarily involved in a...
01:26Tension 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...
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
01:03Anchoring 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:...