IGF-1 Increases Collagen Deposition by Dermal Fibroblasts: Applications for Tissue Engineering.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Age-related decline in stromal cell extracellular matrix deposition compromises tissue engineered constructs.
• Midurethral slings for stress urinary incontinence have safety concerns, driving the need for biological alternatives.

Purpose of the Study:

• To investigate biochemical modulation for enhancing collagen deposition and mechanical properties of self-assembled dermal tissues from female donors of varying ages.
• To identify strategies for improving the mechanical robustness of engineered tissues for midurethral sling applications.

Main Methods:

• Dermal fibroblasts from female donors of different ages were cultured with ascorbic acid.
• Evaluated effects of hormonal supplementation, metabolic/hypoxia stimuli, and insulin signaling (IGF-1) on collagen deposition and mechanical properties.
• Utilized collagen quantification, histological analyses, and mechanical testing.

Main Results:

• Fibroblasts from younger donors produced more collagen than older donors.
• Insulin-like Growth Factor 1 (IGF-1) significantly increased collagen deposition in a dose-dependent manner, even in fibroblasts from older women.
• IGF-1 supplementation substantially improved tissue perforation strength, stiffness, displacement at break, and toughness, while hormones had minimal impact.

Conclusions:

• IGF-1 is a potent enhancer of extracellular matrix production and mechanical performance in self-assembled dermal tissues.
• IGF-1 represents a promising strategy for developing improved biological midurethral slings.