Title
Differential effects of EGF and TGF-beta1 on fibroblast activity in fibrin-based tissue equivalents
UMMS Affiliation
Graduate School of Biomedical Sciences
Publication Date
2007-03-10
Document Type
Article
Disciplines
Life Sciences | Medicine and Health Sciences
Abstract
Transforming growth factor-beta1 (TGF-beta1) is commonly used to promote matrix production for engineered tissues in vitro, yet it also enhances fibroblast contractility. For applications where contraction is undesirable, we hypothesized that epidermal growth factor (EGF) would yield equivalent mechanical properties without enhancing contractility. In this study, the response of human dermal fibroblasts to EGF (5 ng/mL) and TGF-beta1 (5 ng/mL) was determined within hemispheric fibrin-based gels by assessing matrix compaction and strength, cell number, collagen production, and contractility. After 3 weeks, both cytokines enhanced compaction relative to controls, and EGF roughly doubled matrix strength over controls and TGF-beta1-treated samples. TGF-beta1 induced alpha-smooth muscle actin (alphaSMA) expression whereas EGF did not. TGF-beta1 also increased retraction following substrate release while EGF reduced retraction. Treatment with cytochalasin D revealed that, regardless of growth factor, approximately 10% of the total retraction was due to residual matrix stress accumulated during cell-mediated remodeling. EGF increased the cell number by 17%, whereas TGF-beta1 decreased the cell number by 63% relative to controls. EGF and TGF-beta1 stimulated greater collagen content than controls by 49% and 33%, respectively. These data suggest that EGF may be an attractive alternative to TGF-beta1 for engineering fibrin-based connective tissue substitutes with adequate strength and minimal tissue contractility.
DOI of Published Version
10.1089/ten.2006.0206
Source
Tissue Eng. 2007 Apr;13(4):799-807. Link to article on publisher's site
Journal/Book/Conference Title
Tissue engineering
Related Resources
PubMed ID
17346099
Repository Citation
Grouf JL, Throm AM, Balestrini JL, Bush KA, Billiar KL. (2007). Differential effects of EGF and TGF-beta1 on fibroblast activity in fibrin-based tissue equivalents. GSBS Student Publications. https://doi.org/10.1089/ten.2006.0206. Retrieved from https://escholarship.umassmed.edu/gsbs_sp/422