A Comparative Study on Cartilage Induction by Bone Morphogenetic Protein Mixed With Different Carriers in Canine Tracheal Autografts / 中国医师杂志

ABSTRACT

Objective Three soluble materials were used as carrier of recombinant human bone morphogenetic protein-2(rhBMP-2) in order to seek suitable slow-release carrier of rhBMP-2,which induced neogenetic cartilage in canine tracheal autografting segment.Methods 32 mongrel dogs were randomly and equally divided into 4 groups.A five-ring cervical tracheal segment was harvested as the autograft.The materials including dextran,polyvinyl pyrrolidone(PVP) and collagen were respectively combined with equal rhBMP-2 and then injected into the soft tissues between cartilaginous rings of autografts.In addition,without carrier group was used as controls.Then the autografts were heterotopically transplanted into greater omentum.The animals were sacrificed at postoperative 4 weeks,and the postmortem specimens were examined grossly and histologically.Results Cartilage rings of the grafts were partly absorbed in all four groups.New cartilage was induced in the rhBMP-2 injected area in the groups in which PVP or collagen was used as carrier,and more new cartilage was observed in the collagen group.Conclusions PVP and collagen could be sustained as release carriers for rhBMP-2 in tracheal autograft.Collagen is more effective as a carrier than other vehicles and it could enhance the ability of rhBMP-2 inducing cartilage regeneration in tracheal transplantation.