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Related Concept Videos

Mesenchymal Stem Cells01:19

Mesenchymal Stem Cells

Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their access...
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...
The Extracellular Matrix01:42

The Extracellular Matrix

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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...
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...
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...

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Related Experiment Video

Updated: May 8, 2026

A Simplified System for Evaluating Cell Mechanosensing and Durotaxis In Vitro
09:50

A Simplified System for Evaluating Cell Mechanosensing and Durotaxis In Vitro

Published on: August 27, 2015

Mesenchymal stem cells exploit extracellular matrix as mechanotransducer.

Bojun Li1, Cameron Moshfegh, Zhe Lin

  • 1Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.

Scientific Reports
|August 14, 2013
PubMed
Summary

Human mesenchymal stem cells (hMSCs) stretch fibronectin fibers in their extracellular matrix (ECM) to regulate osteogenesis. This mechanotransduction process involves specific integrins and signaling pathways, offering insights into stem cell differentiation.

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Published on: March 1, 2024

Area of Science:

  • Biochemistry
  • Cell Biology
  • Biomaterials Science

Background:

  • Stem cells sense physical environmental cues, but the molecular mechanisms of physical-to-biochemical signal transduction are unclear.
  • Understanding how stem cells interpret mechanical properties is crucial for regenerative medicine and tissue engineering.

Purpose of the Study:

  • To investigate how human mesenchymal stem cells (hMSCs) translate physical extracellular matrix (ECM) properties into biochemical signals.
  • To elucidate the role of fibronectin fibril mechanoregulation in hMSC osteogenesis.

Main Methods:

  • hMSCs were cultured on fibronectin-coated polyacrylamide gels of varying stiffness.
  • hMSCs were cultured on single stretched fibronectin fibers.
  • Specific integrin blocking (αvβ3, α5β1) and epidermal growth factor (EGF) receptor signaling inhibition were employed.

Main Results:

  • hMSCs assemble and actively remodel plasma fibronectin into ECM fibrils within 24 hours.
  • Fibronectin fibers are stretched more on rigid substrates, and this stretching upregulates hMSC osteogenesis.
  • Osteogenesis is differentially regulated by integrin αvβ3 on relaxed fibers and integrins α5β1/EGF receptor signaling on stretched fibers.

Conclusions:

  • hMSCs use contractile forces to stretch fibronectin fibrils, translating mechanical cues into biochemical signals.
  • Mechanoregulation of fibronectin fibrils acts as a checkpoint controlling hMSC osteogenesis.
  • This study reveals a novel mechanism of mechanotransduction in stem cell differentiation.