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Related Concept Videos

Cell-matrix's Response to Mechanical Forces01:13

Cell-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...
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...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Extracellular Matrix01:26

Extracellular Matrix

Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
The Extracellular Matrix01:42

The Extracellular Matrix

Overview
The Extracellular Matrix01:29

The Extracellular Matrix

Overview
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...

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Related Experiment Video

Updated: May 22, 2026

Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions
11:37

Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions

Published on: February 3, 2018

Extracellular-matrix tethering regulates stem-cell fate.

Britta Trappmann1, Julien E Gautrot, John T Connelly

  • 1Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.

Nature Materials
|May 29, 2012
PubMed
Summary
This summary is machine-generated.

Stem cell fate is determined by substrate stiffness and collagen fiber spacing. Cells differentiate on softer materials due to reduced focal adhesions and signaling, indicating mechanical force sensing.

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Using Cell-substrate Impedance and Live Cell Imaging to Measure Real-time Changes in Cellular Adhesion and De-adhesion Induced by Matrix Modification
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Using Cell-substrate Impedance and Live Cell Imaging to Measure Real-time Changes in Cellular Adhesion and De-adhesion Induced by Matrix Modification

Published on: February 19, 2015

A High-throughput Cell Microarray Platform for Correlative Analysis of Cell Differentiation and Traction Forces
12:04

A High-throughput Cell Microarray Platform for Correlative Analysis of Cell Differentiation and Traction Forces

Published on: March 1, 2017

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Last Updated: May 22, 2026

Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions
11:37

Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions

Published on: February 3, 2018

Using Cell-substrate Impedance and Live Cell Imaging to Measure Real-time Changes in Cellular Adhesion and De-adhesion Induced by Matrix Modification
09:11

Using Cell-substrate Impedance and Live Cell Imaging to Measure Real-time Changes in Cellular Adhesion and De-adhesion Induced by Matrix Modification

Published on: February 19, 2015

A High-throughput Cell Microarray Platform for Correlative Analysis of Cell Differentiation and Traction Forces
12:04

A High-throughput Cell Microarray Platform for Correlative Analysis of Cell Differentiation and Traction Forces

Published on: March 1, 2017

Area of Science:

  • Biomaterials Science
  • Stem Cell Biology
  • Mechanobiology

Background:

  • Substrate properties significantly influence stem cell behavior and fate.
  • Understanding the interplay between material characteristics and cellular responses is crucial for regenerative medicine.

Purpose of the Study:

  • To investigate how substrate stiffness and collagen coating influence human epidermal and mesenchymal stem cell fate.
  • To elucidate the role of focal adhesions and signaling pathways in substrate-mediated stem cell differentiation.

Main Methods:

  • Culturing single human epidermal stem cells on polydimethylsiloxane (PDMS) and polyacrylamide (PAAm) hydrogels of varying stiffness.
  • Assessing cell spreading, differentiation, and focal adhesion formation.
  • Measuring extracellular-signal-related kinase (ERK)/mitogen-activated protein kinase (MAPK) pathway activation.
  • Analyzing substrate porosity and collagen anchoring density.

Main Results:

  • PDMS stiffness did not affect stem cell differentiation.
  • PAAm stiffness regulated stem cell differentiation, with softer substrates (0.5 kPa) leading to differentiation.
  • Cells on soft PAAm hydrogels showed reduced focal adhesion stability and decreased ERK/MAPK signaling.
  • Lower collagen anchoring density correlated with increased stem cell differentiation.

Conclusions:

  • Stem cell fate decisions are influenced by the mechanical properties of the substrate, specifically the elastic modulus and collagen fiber spacing.
  • Stem cells sense mechanical forces exerted on extracellular matrix fibers to regulate their fate.
  • The findings highlight the importance of biomaterial design in controlling stem cell behavior.