摘要目的 探讨脐动脉平滑肌细胞(HUASMC)与阴茎海绵体脱细胞基质(ACCM)复合构建海绵体平滑肌的可行性.方法 以1%的Triton-X100与0.1%NH3H2O混合液对兔阴茎海绵体进行脱细胞处理,制备ACCM.采用贴块法分离、培养、扩增HUASMC.HUASMC以30×10<'6>/ml密度接种ACCM,细胞-ACCM体外复合10 d后将复合物植入9只5周龄BALB/C裸鼠背部皮下,术后10、20和40 d分别对移植物进行HE染色、免疫组织化学染色和器官浴槽实验,评价其裸鼠体内构建情况.结果 ACCM为白色圆柱状,镜下为富含胶原的疏松多孔结构,不含细胞成分.HUA-SMC与ACCM相容性良好,HUASMC在与ACCM接触部位充分伸展,并沿ACCM窦隙活跃生长.9只裸鼠均存活,植入部位无感染,无植入物排斥发生.随培育时间延长,裸鼠体内ACCM逐渐降解,植入的HUASMC分化形成结构良好、交错排列的平滑肌组织.器官浴槽实验显示,构建组织对去氧肾上腺素和电刺激均表现出收缩功能,去氧肾上腺素和电刺激所诱导的最大收缩力分别为(3.64±0.18)和(2.50±0.21)g.结论 HUASMC作为种子细胞与ACCM复合可构建出具有一定形态和功能的组织工程海绵体平滑肌.

abstractsObjective To investigate the feasibility of constructing tissue engineered corpora cavernosa smooth muscle by seeding human umbilical artery smooth muscle cells (HUASMCs) in acel-lular collagen matrices.Methods Acellular corporal collagen matrices (ACCM) were obtained from the penis of adult rabbits by a cell removal procedure.HUASMCs were isolated from human umbilical cords through explant techniques and cultured in vitro.Subsequently,HUASMCs were seeded to ACCM and cultured in vitro.After that,the seeded ACCMs were implanted subcutaneously in 9 BALB/C athymic mice.Animals were killed 10,20 and 40 days after implantation.The implants were retrieved and morphological examinations were performed to evaluate characteristics of the engineered tissues.Additionally,organ bath studies were performed to address the contractility of the engineered tissues.Results The deeellularization process successfully extracted all cellular components; colla-gen fibers maintained their original porous morphology and structure.ACCM could be reseeded with cultured HUASMCs in vitro,and HUASMCs had the potential of attachment and proliferation on the three-dimensional ACCM scaffolds.Histologic analyses of the explants from all time points demon-strated a progressive regeneration of corpus cavernosum smooth muscle,with structures very similar to those of the native corpus cavernosum,The maximum contraction force induced by phenylephrine and electrical stimulation was (3.64+0.18)g and (2.50+0.21)g.Conclusion HUASMCs can be seeded on 3-dimensional ACCM scaffolds and will develop a tissue similar to that of the native corpus eavernosum smooth muscle.