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The Extracellular Matrix

The Extracellular Matrix

The Extracellular Matrix

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 Matrix

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...

Cell-matrix's Response to Mechanical Forces

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...

Mesenchymal Stem Cells

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...

Overview of Cell-Matrix Interactions

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: Dec 31, 2025

Epithelial Cell Repopulation and Preparation of Rodent Extracellular Matrix Scaffolds for Renal Tissue Development

Epithelial Cell Repopulation and Preparation of Rodent Extracellular Matrix Scaffolds for Renal Tissue Development

Published on: August 10, 2015

Stem cells from trabecular meshwork cells can secrete extracellular matrix.

Elizabeth Xiaomeng Wang¹, Xin Jiang²

¹The Webb Schools, Claremont, CA, USA.

Biochemical and Biophysical Research Communications

|January 7, 2020

Summary

Researchers isolated trabecular meshwork stem cells (TMSCs) to develop new glaucoma treatments. These TMSCs differentiated into cells that produce essential extracellular matrix components, supporting eye tissue function.

Keywords:

Extracellular matrix Stem cell Trabecular meshwork

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Last Updated: Dec 31, 2025

Epithelial Cell Repopulation and Preparation of Rodent Extracellular Matrix Scaffolds for Renal Tissue Development

Epithelial Cell Repopulation and Preparation of Rodent Extracellular Matrix Scaffolds for Renal Tissue Development

Published on: August 10, 2015

Production of Extracellular Matrix Fibers via Sacrificial Hollow Fiber Membrane Cell Culture

Production of Extracellular Matrix Fibers via Sacrificial Hollow Fiber Membrane Cell Culture

Published on: February 2, 2019

A Rapid, Scalable Method for the Isolation, Functional Study, and Analysis of Cell-derived Extracellular Matrix

A Rapid, Scalable Method for the Isolation, Functional Study, and Analysis of Cell-derived Extracellular Matrix

Published on: January 4, 2017

Area of Science:

Ophthalmology
Stem Cell Biology
Tissue Engineering

Background:

Glaucoma is a leading cause of irreversible blindness.
Current treatments aim to reduce intraocular pressure but do not restore damaged tissues.
Trabecular meshwork stem cells (TMSCs) offer potential for regenerative therapies.

Purpose of the Study:

To isolate and characterize fetal calf trabecular meshwork stem cells (TMSCs).
To investigate the differentiation potential of TMSCs into trabecular meshwork (TM) cells.
To evaluate the extracellular matrix (ECM) production of differentiated TM cells for glaucoma treatment.

Main Methods:

Isolation of TMSCs using side population cell sorting.
Identification of TMSCs via immunofluorescent staining for stem cell markers (Notch1, OCT-3/4).
Western blot analysis to assess ECM component expression (fibronectin, laminin, collagen I, collagen IV) in differentiated TM cells.

Main Results:

Isolated TMSCs expressed stem cell markers (Notch1, OCT-3/4) but not TM cell markers (TIMP3, AQP1).
Primary TM cells expressed TM cell markers but not stem cell markers.
TM cells differentiated from TMSCs demonstrated positive expression of key ECM components.

Conclusions:

Fetal calf TMSCs can be successfully isolated and identified.
TMSCs can differentiate into TM cells capable of secreting crucial ECM components.
This provides a foundation for novel regenerative therapies for glaucoma by restoring TM function.