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时间:2020-03-01
《临床医学论文 人骨形成蛋白7基因修饰的兔骨髓基质干细胞异位成骨实验.doc》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、临床医学论文•人骨形成蛋白7基因修饰的兔骨髓基质干细胞异位成骨实验作者:闫露,罗二平,鱼兵,栗艳,沈敏,范清宇【摘要】[目的]通过人骨形成蛋白7(humanbonemorphogeneticprotein7,BMP7)基因修饰的兔骨髓基质干细胞(mesenchymalstemcel1s,MSCs)与聚乳酸.疑基乙酸(polycleclidecoplycoclide,PLGA)支架复合,进行自体皮下异位成骨实验,探索BMP-7基因治疗与组织工程技术相结合的可行性。[方法]PLGA与腺病毒Ad-BMP-7感染后的兔MSCs共培养,电镜观察了解细胞在PLGA
2、上黏附、生长和合成分泌骨基质成分的情况;将转染基因的细胞和未转染基因的细胞分别与PLGA支架复合,构建组织工程化骨并植入体内,通过组织观察新骨形成情况。[结果]制备得到的PLGA为疏松多孔的网格样结构,具有一•定的韧性和强度。将腺病毒感染的骨髓基质干细胞接种于修剪成一定形状的PLGA上,经电镜观察可见细胞贴附于材料表面和孔隙内并增殖。异位成骨实验证实空白对照PLGA孔隙内无新骨形成,对照细胞组内有部分新生骨形成,rfn'AdBMP7实验组形成的新生骨组织面积更大(P<0.05)o[结论]应用hBMP7基因修饰的MSCs作为骨组织工程的种子细胞,可望取得
3、更强的成骨能力。【关键词】基因治疗;骨形成蛋白;组织工程Abstract:[Objective]hBMP7genetherapycombinedwithIissueengineeringtechniqueswasexploredtoimproveosteogenesisinanectopicboneformationmodelinrabbits.[Method]PLGA(withdiameterof150〜300umandporosityof90%)waspreparedandautologousbonemarrowstromalcells(bMSCs
4、)infectedbyadenoviruscarringhBMP7gcnc(AdBMP7)wereseededontoit.Scanningelectronicmicroscopingwereusedtoobservecel1matrixinteraction.ThecellsinfectedandnoninfectedwerecombinedwithPLGAataconcentrationof5X106cclls/mltoconstructtissueengineeredbonesrespectively.Theywerefurtherimplant
5、edinto8rabbitssubcutaneouslyusingPLGAasblankcontrol(8implantspergroup).Sixweeksaftersurgery,theimplantswereevaluatedwithhistologicalstainingandcomputerizedanalysisofnewboneformation.[Rcsult]PLGApreparedwasagrid1ikeporousstructure,withdefiniteducti1ityandstrength,andcouldbetrimme
6、dintodifferentmodels.AdenovirusinfectedMSCsseededontoPLGAshowedhighlevelofpro!iferation,andmasssynthesisofcel1matrixwasobservedwithelectronicmicroscoping.Intheectopicboneformationmodel,PLGAalonecouldnotinducenewboneformation.ThenewboneareaformedinthenoninfectedMSCsgroupwas28.6±6
7、.l%,whileAdBMP7groupwas57.5±5.7%,whichwashigherthanthatoftheformersignificantly(P<0.05).[Conclusion]hBMP7genemodifiedMSCscouldenhanceectopicnewboneformationinrabbits・TheseresultsindicatedthattheinfectionofMSCswithhBMP7adenovirusmightbesuitableforbonetissueengineeringapplications
8、・Keywords:genetherapy;bonemorphogeneticprotein;
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