犬自体气管移植中骨形态发生蛋白复合不同载体的成软骨比较

目的：以三种可溶性物质作为重组人骨形态发生蛋白－2（rhBMP-2)的载体，寻求适合作为rhBMP-2在犬的自体气管移植段内诱发新生软骨的缓释载体。方法：32只犬随机等分4组，颈部切取5环气管段作为移植段。等量的rhBMP-2分别与葡聚糖、聚乙烯吡咯烷酮（PVP）和胶原复合，另设无载体作为对照，均注射入各移植段内。然后将移植段埋入自体的腹腔大网膜中。于术后4周处死动物取材，行大体及组织学观察。结果：移植段固有软骨环被部分地吸收。PVP和胶原组软件环间rhBMP-2复合物樾入区有大量新生软骨形成，且以胶原组更明显。结论：PVP和胶原均可协助rhBMP-2诱发气管移植段软骨再生，胶原更适合充当rhBMP-2的缓释载体。

A Comparative Study on Cartilage Induction by Bone Morphogenetic Protein Mixed With Different Carriers in Canine Tracheal Autografts

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.