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The Extracellular Matrix

The Extracellular Matrix

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 MatrixThe extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse molecules.

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...

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Related Experiment Video

Updated: Jun 16, 2026

Generation of Alginate Microspheres for Biomedical Applications

Generation of Alginate Microspheres for Biomedical Applications

Published on: August 12, 2012

An Injectable Alginate Hydrogel Modified by Collagen and Fibronectin for Better Cellular Environment.

Daqian Gao^1,2, William D Shipman³, Yaping Sun⁴

¹Division of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, 310 Cedar Street, New Haven, Connecticut 06510, United States.

ACS Applied Bio Materials

|January 31, 2025

Summary

Engineered alginate hydrogels with collagen and fibronectin enhance fibroblast function for improved wound healing. This composite material promotes cell activity and cytokine secretion, showing therapeutic potential.

Keywords:

Alginate hydrogel Angiogenesis Diabetic wound healing Modification VEGF

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Last Updated: Jun 16, 2026

Generation of Alginate Microspheres for Biomedical Applications

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Published on: August 12, 2012

Synthesis of Thermogelling PolyN-isopropylacrylamide-graft-chondroitin Sulfate Composites with Alginate Microparticles for Tissue Engineering

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Preparation of Chitosan-based Injectable Hydrogels and Its Application in 3D Cell Culture

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Published on: September 29, 2017

Area of Science:

Biomaterials Science
Tissue Engineering
Regenerative Medicine

Background:

Alginate hydrogels are promising for wound healing but require improved fibroblast function.
Enhancing the cellular microenvironment within hydrogels is crucial for therapeutic efficacy.

Purpose of the Study:

To engineer an injectable alginate-based hydrogel incorporating collagen and fibronectin.
To investigate the impact of this composite hydrogel on fibroblast behavior and cytokine secretion for wound healing applications.

Main Methods:

Fabrication of alginate/collagen/fibronectin composite hydrogels.
Characterization of microstructure, mechanical properties (storage modulus), and pore size.
Encapsulation of fibroblasts and assessment of cell spreading, proliferation, and cytokine secretion (including VEGF).

Main Results:

The composite hydrogel exhibited fibril formation and macroporous structures (100-500 μm).
Storage modulus increased approximately 12-fold compared to collagen hydrogel.
Encapsulated fibroblasts showed enhanced spreading, proliferation, and cytokine secretion, including upregulated VEGF.

Conclusions:

The alginate/collagen/fibronectin hydrogel provides a superior microenvironment for fibroblasts compared to alginate alone.
The composite hydrogel demonstrates potential for promoting wound healing through enhanced fibroblast function and pro-angiogenic signaling.