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Targeting and Immobilization of Bioactive Peptides on Dentin Matrix

¹ Department of Endodontics and
² Department of Anatomy and Cell Biology, School of Dental Medicine, University of Pennsylvania, 240 South 40th Street, Levy Bldg, Rm 423, Philadelphia, PA 19104, USA; and
³ Department of Conservative Dentistry, University of Ulsan, Asan Medical Center, Seoul, Korea

^* corresponding author, yumigimai{at}comcast.net, jscsong{at}yahoo.com

The regeneration of structurally/functionally competent tooth root cementum is a critical step for the successful restoration of periodontal attachment. In this study, we tested whether a poly-glutamic acid-rich domain and glutamine-containing transglutaminase substrate can be used to target biologically active peptides to the mineralized root matrix and to bind such peptides covalently to the organic matrix. As a biologically active model molecule, the integrin-binding motif, RGD, was used. The effects of immobilization of such synthetic peptides to the dentin matrix on cementoblastic adhesion in vitro and cementogenesis in vivo were studied. In vitro, cementoblastic adhesion improved significantly when the dentin surface contained covalently bound peptides. In vivo, this bound peptide significantly increased cementum formation compared with that attained in control conditions. Transglutaminase-catalyzed covalent binding of bioactive peptides targeted to mineralized collagenous dentin matrix via the poly-glutamate domain can be readily achieved. This approach offers potential for clinical use in periodontal regeneration.

KEY WORDS: peptide • dentin • bioactive • periodontal • regeneration