title: Local injection of thrombin-related peptide (TP508) in PPF/PLGA microparticles-enhanced bone formation during distraction osteogenesis.
abstract: We have previously demonstrated that injections of the thrombin-related peptide, TP508, into the lengthening gap have significantly enhanced bone consolidation in a rabbit model of distraction osteogenesis. This study was to further test the effect of a single TP508 injection in slow release preparation on bone formation during distraction osteogenesis. Rabbits had left tibiae lengthened unilateral lengthener at rate of 1.4 mm/day for 6 days. TP508 was injected into as the following: Group 1, TP508 in saline; Group 2, in PPF/PLGA [poly(propylene fumarate)/poly(D,L-lactic-co-glycolic acid)] microparticles; and Group 3, dextran gel only. All the animals were killed 2 weeks after lengthening. On radiographies, more bone was formed in the two TP508-treated groups at first and secnd week postlengthening than that of the control Group 3. Microcomputed tomography (microCT) at 2 weeks indicated that the most advanced bone formation and remodeling was seen in Group 2. The mean volumetric BMD of the regenerates was significantly higher in the TP508 treated groups compared to the control group (p < 0.05). Histological evaluations supported the radiographic and the microCT results. In conclusion, we have demonstrated that a single injection of small amount of TP508 (300 microg) at the end of lengthening phases has significantly enhanced bone consolidation process in a rabbit model of distraction osteogenesis. The delivery of TP508 in PPF/PLGA microparticles appears to lead to a better quality bone formation over the saline delivery, further examinations are needed to confirm if PPF/PLGA microparticles may be desirable drug delivery form in augmenting bone formation.
authors.affiliation: Department of Orthopaedic Surgery, General Hospital of Chinese People's Liberation Army, Beijing 100853, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Wan
authors.forename: George
authors.initials: G
authors.lastname: Szöke
authors.forename: James T
authors.initials: JT
authors.lastname: Ryaby
authors.forename: Gang
authors.initials: G
authors.lastname: Li
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D004337:Drug Carriers; D005650:Fumarates; D015552:Injections, Intralesional; D019344:Lactic Acid; D008297:Male; D008863:Microspheres; D010012:Osteogenesis / Q000187:drug effects*; D019857:Osteogenesis, Distraction; D010446:Peptide Fragments / Q000008:administration & dosage*; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D011126:Polypropylenes; D011817:Rabbits; D013917:Thrombin; D013977:Tibia / Q000000981:diagnostic imaging / Q000187:drug effects* / Q000473:pathology; D014057:Tomography, X-Ray Computed
chemical_list: D001672:Biocompatible Materials; D004337:Drug Carriers; D005650:Fumarates; D010446:Peptide Fragments; D011108:Polymers; D011126:Polypropylenes; C097850:poly(propylene fumarate); D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; C412222:rusalatide acetate; D013917:Thrombin