Biomimetic Composite Scaffold With Phosphoserine Signaling for Bone Tissue Engineering Application

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Scaffold properties critically influence mesenchymal stem cell (MSC) ingrowth in bone tissue engineering.
• Protein adsorption onto biomaterials post-implantation modulates early cell-scaffold interactions.

Purpose of the Study:

• To develop O-phospho-L-serine (OPS)-modified collagen/nanohydroxyapatite (Coll/nanoHA) composite scaffolds.
• To mimic bone tissue and promote osteogenic differentiation of MSCs.
• To evaluate the efficacy of OPS-modified scaffolds for bone regeneration.

Main Methods:

• Coll/nanoHA scaffolds were synthesized with varying concentrations of OPS.
• Physicochemical, mechanical, and in vitro cellular behaviors (adhesion, proliferation, ALP activity) were assessed.
• In vivo ectopic bone formation studies were conducted using OPS-modified scaffolds with or without pre-cultured human MSCs.

Main Results:

• OPS modification enhanced alkaline phosphatase (ALP) activity in human bone marrow-derived MSCs (HBMSCs).
• In vivo studies demonstrated that OPS-scaffolds promoted MSC osteogenic differentiation into late osteoblasts.
• OPS-modified scaffolds improved cell survival, engraftment, migration, and spatial distribution within the 3D matrix.

Conclusions:

• OPS-modified Coll/nanoHA scaffolds effectively promote osteogenic differentiation of MSCs.
• These scaffolds enhance cell behavior and bone formation in vivo.
• OPS-modified scaffolds show potential as cell-loaded constructs for accelerated bone regeneration.