Tendon tissue engineering: adipose-derived stem cell and GDF-5 mediated regeneration using electrospun matrix...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Current tendon repair methods like autografts and allografts are suboptimal, leading to slow healing and functional deficits, especially in complex injuries.
• Tendon tissue engineering aims to regenerate defects using biomaterial scaffolds that mimic the native tendon extracellular matrix (ECM) and possess suitable biomechanical properties.
• Autologous cells combined with advanced scaffolds offer a promising avenue for successful tendon defect regeneration.

Purpose of the Study:

• To investigate the effect of Growth Differentiation Factor-5 (GDF-5) on the proliferation and gene expression of primary rat adipose-derived stem cells (ADSCs).
• To compare the efficacy of GDF-5 in modulating ADSCs cultured on a 3D electrospun poly(DL-lactide-co-glycolide) (PLAGA) fiber scaffold versus a 2D PLAGA film scaffold.
• To assess the potential of GDF-5 stimulation for generating neotendon tissue for regenerative purposes.

Main Methods:

• Primary rat ADSCs were cultured on two types of PLAGA scaffolds: a 3D electrospun fiber scaffold mimicking native tendon collagen structure and a 2D film scaffold.
• Cells were treated with GDF-5, and their proliferation and gene expression patterns were analyzed.
• Key gene markers for tendon development, including scleraxis (a neotendon marker) and collagen type I (a major ECM protein), were quantified.

Main Results:

• The 3D electrospun scaffold effectively supported ADSC adhesion and proliferation, mimicking native tendon collagen fiber bundles.
• GDF-5 treatment upregulated scleraxis gene expression seven- to eightfold within 1 week on the 3D scaffold, significantly higher than on 2D films at 2 weeks.
• Collagen type I gene expression increased fourfold with GDF-5 treatment starting at 1 week, and was consistently higher on the 3D scaffold compared to 2D films, regardless of GDF-5 presence.

Conclusions:

• GDF-5 stimulation significantly modulates primary ADSCs cultured on a 3D PLAGA fiber scaffold.
• This modulation promotes the production of a soft, collagenous musculoskeletal tissue, indicating potential for tendon regeneration.
• The findings highlight the potential of combining GDF-5 with biomimetic 3D scaffolds for effective tendon tissue engineering.