title: An isolated cryptic peptide influences osteogenesis and bone remodeling in an adult mammalian model of digit amputation.
abstract: Biologic scaffolds composed of extracellular matrix (ECM) have been used successfully in preclinical models and humans for constructive remodeling of functional, site-appropriate tissue after injury. The mechanisms underlying ECM-mediated constructive remodeling are not completely understood, but scaffold degradation and site-directed recruitment of progenitor cells are thought to play critical roles. Previous studies have identified a cryptic peptide derived from the C-terminal telopeptide of collagen IIIα that has chemotactic activity for progenitor cells. The present study characterized the osteogenic activity of the same peptide in vitro and in vivo in an adult murine model of digit amputation. The present study showed that the cryptic peptide increased calcium deposition, alkaline phosphatase activity, and osteogenic gene expression in human perivascular stem cells in vitro. Treatment with the cryptic peptide in a murine model of mid-second phalanx digit amputation led to the formation of a bone nodule at the site of amputation. In addition to potential therapeutic implications for the treatment of bone injuries and facilitation of reconstructive surgical procedures, cryptic peptides with the ability to alter stem cell recruitment and differentiation at a site of injury may serve as powerful new tools for influencing stem cell fate in the local injury microenvironment.
authors: McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
authors: Vineet
authors: V
authors: Agrawal
authors: Jeremy
authors: J
authors: Kelly
authors: Stephen
authors: S
authors: Tottey
authors: Kerry A
authors: KA
authors: Daly
authors: Scott A
authors: SA
authors: Johnson
authors: Bernard F
authors: BF
authors: Siu
authors: Janet
authors: J
authors: Reing
authors: Stephen F
authors: SF
authors: Badylak
mesh_terms: D050156:Adipogenesis / Q000187:drug effects / Q000235:genetics; D000375:Aging / Q000187:drug effects*; D000469:Alkaline Phosphatase / Q000378:metabolism; D000595:Amino Acid Sequence; D000671:Amputation, Surgical; D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D016723:Bone Remodeling / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D020219:Chondrogenesis / Q000187:drug effects / Q000235:genetics; D005552:Forelimb / Q000187:drug effects / Q000601:surgery; D006801:Humans; D008322:Mammals / Q000601:surgery*; D051379:Mice; D008810:Mice, Inbred C57BL; D023421:Models, Animal; D008969:Molecular Sequence Data; D010012:Osteogenesis / Q000187:drug effects*; D010455:Peptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D055748:SOXB1 Transcription Factors / Q000378:metabolism; D013234:Stem Cells / Q000166:cytology / Q000187:drug effects / Q000201:enzymology; D014034:Toes / Q000601:surgery
chemical_list: D015415:Biomarkers; D010455:Peptides; D055748:SOXB1 Transcription Factors; D000469:Alkaline Phosphatase