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Related Experiment Video

Updated: Jul 14, 2026

Studying the Effects of Matrix Stiffness on Cellular Function using Acrylamide-based Hydrogels

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Published on: August 10, 2010

Collagen stiffness regulates cellular contraction and matrix remodeling gene expression.

D Karamichos¹, R A Brown, V Mudera

¹UCL, Tissue Repair and Engineering Centre, Institute of Orthopaedics and Musculoskeletal Sciences, London, HA7 4LP, United Kingdom. Dimitris.Karamichos@UTSouthwestern.edu

Journal of Biomedical Materials Research. Part A

|June 15, 2007

Summary

Increased matrix stiffness reduces fibroblast force generation and delays contraction. This response is cell lineage-dependent, impacting gene expression differently in human dermal fibroblasts versus neonatal foreskin fibroblasts.

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Last Updated: Jul 14, 2026

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Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

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Area of Science:

Biomaterials Science
Cell Biology
Tissue Engineering

Background:

Cellular mechanical and 3D spatial cues are critical for tissue development and regeneration.
Fibroblast-seeded 3D collagen constructs serve as bioartificial extracellular matrices (ECM).
Cell-generated contractile forces are influenced by various factors including matrix stiffness.

Purpose of the Study:

To quantify the cytomechanical and molecular responses of human dermal fibroblasts (HDF) and neonatal foreskin fibroblasts (HNFF) in stiffer 3D collagen constructs.
To investigate the effect of serum starvation on early cell attachment and subsequent cellular responses.

Main Methods:

Fibroblast-seeded 3D collagen constructs were subjected to uniaxial strain to increase matrix stiffness.
Cellular force generation was monitored using a tensional culture force monitor (t-CFM).
Gene expression analysis for MMP-2, TIMP-2, and collagen type III was performed.

Main Results:

Increased matrix stiffness significantly reduced cellular force generation (up to 70%) and delayed measurable contraction (up to sevenfold) in both HDF and HNFF.
The delay in force generation was dependent on the cell lineage but not on fetal calf serum (FCS) presence.
Gene expression of MMP-2, TIMP-2, and collagen type III was upregulated in HDFs within stiffer constructs, while HNFFs showed no significant changes.

Conclusions:

Matrix stiffness plays a crucial role in modulating fibroblast-mediated force generation and contraction in 3D collagen constructs.
Fibroblast responses to matrix stiffness, including force generation and gene expression, are cell lineage-specific.
These findings highlight the importance of considering matrix properties and cell type in designing biomaterials for tissue engineering applications.