Fibronectin Peptides

Fibronectin peptides are bioactive fragments derived from the large extracellular matrix glycoprotein fibronectin, primarily containing the RGD cell-adhesion motif and the synergy sequence PHSRN. They are studied for wound healing, tissue engineering, cell migration promotion, and as surface coatings for implantable biomaterials.

Fibronectin's primary integrin-binding motif, RGD (Arg-Gly-Asp), located on the type III10 fibronectin domain, engages α5β1, αvβ1, αvβ3, and αvβ5 integrins. A synergy site — PHSRN on the adjacent type III9 domain — cooperates with RGD for maximal α5β1-mediated adhesion and migration. Integrin engagement activates FAK, Src, and downstream MAPK/PI3K/Akt pathways, driving cell spreading, proliferation, and survival. In wound healing contexts, fibronectin peptides accelerate keratinocyte migration, promote fibroblast matrix remodeling, and support angiogenesis via integrin-VEGF receptor crosstalk.

Fibronectin's role in wound repair is well established: it is a primary component of the provisional wound matrix and provides the adhesive substrate for migrating keratinocytes and fibroblasts. Synthetic fibronectin peptides and fragments incorporating RGD and PHSRN have been tested in preclinical wound models with positive results for re-epithelialization. Fibronectin peptide coatings on implants reduce fibrous encapsulation and improve osseointegration. Clinical translation is ongoing; no fibronectin-derived peptide is FDA-approved as a standalone drug, though fibronectin is present in some wound care biologics.