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Articles 1 - 2 of 2
Full-Text Articles in Medicine and Health Sciences
Biaxial Failure Properties Of Planar Living Tissue Equivalents, Kristen Billiar, Angela Throm, Margo Frey
Biaxial Failure Properties Of Planar Living Tissue Equivalents, Kristen Billiar, Angela Throm, Margo Frey
Kristen L. Billiar
Quantification of the mechanical properties of living tissue equivalents (LTEs) is essential for assessing their ultimate functionality as tissue substitutes, yet their delicate nature makes failure testing problematic. For this study, we evaluated the validity of using an inflation device for quantifying the biaxial tensile failure properties of extremely delicate fibroblast-populated collagen gels (CGs) and fibrin gels (FGs). Small samples were circularly clamped and then inflated until rupture. Each sample assumed an approximately spherical shape and burst at its center indicating effective clamping. After two weeks in culture, all LTEs tested were fragile, but the FGs were significantly stronger and …
Differential Effects Of Egf And Tgf-Beta1 On Fibroblast Activity In Fibrin-Based Tissue Equivalents, Jaime Grouf, Angela Throm, Jenna Balestrini, Katie Bush, Kristen Billiar
Differential Effects Of Egf And Tgf-Beta1 On Fibroblast Activity In Fibrin-Based Tissue Equivalents, Jaime Grouf, Angela Throm, Jenna Balestrini, Katie Bush, Kristen Billiar
Kristen L. Billiar
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 …