摘要：Autologous bone marrow-derived mesenchymal stem cells(BMSCs)have been shown to promote osteogenesis;however,the effects of allogeneic BMSCs(allo-BMSCs)on bone regeneration remain ***,we explored the bone regeneration promotion effect of allo-BMSCs in 3D-printed autologous bone particle(ABP)***,we concurrently printed scaffolds with polycaprolactone,ABPs,and allo-BMSCs for appropriate support,providing bioactive factors and seed cells to promote *** vitro studies showed that ABP scaffolds promoted allo-BMSC osteogenic *** vivo studies revealed that the implantation of scaffolds loaded with ABPs and allo-BMSCs into canine skull defects for nine months promoted *** experiments suggested that only a small portion of implanted allo-BMSCs survived and differentiated into vascular endothelial cells,chondrocytes,and *** implanted allo-BMSCs released stromal cell-derived factor 1 through paracrine signaling to recruit native BMSCs into the defect,promoting bone *** study contributes to our understanding of allo-BMSCs,providing information relevant to their future application.

摘要：首先基于头部动态测试系统与激波管和外场实弹实爆测试环境,验证了眼部装备(护目镜和风镜)的防护性能。研究结果表明,风镜防护性能更优,建议给执勤人员配发兼容防紫外、强光、烟雾和防破片功能的风镜产品,以提高相关人员眼部防护能力。此后,研究眼部爆震伤后组织损伤、功能改变及市售风镜动物实验版的防护作用与机制,为防治眼部爆震伤及风镜后续的设计改进提供理论依据。选用比格犬和C57小鼠进行相关动物实验,通过HE、Tunel、Nissl染色、视觉电生理检查等检测方法,发现随着冲击波强度的提高和伤后时间的延长,视网膜损伤程度和细胞凋亡程度均提高,其中神经节细胞层(ganglion cell layer,GCL)和光感受器内外节交界处(layer of photoreceptor inner/outer segments,IS/OS)受到的损伤最严重;进一步研究分子变化发现,自噬相关调节蛋白SQSTM1/p62(P<0.0001)和LC3-Ⅱ(P=0.8437)、LC3-Ⅰ(P=0.003)的表达量明显增高,说明视网膜损伤一定程度上是由爆震伤后自噬增强这一机制导致的。市售风镜的动物实验版能够有效减轻冲击波对视网膜的损伤,保护RNFL、INL/ONL、GCL和IS/OS的结构。同时,与其他组相比,3.5 MPa组防护组与损伤组视网膜损伤和细胞凋亡程度差异最显著,推测该强度下防护风镜发挥了最大的保护作用,保护机制与防护降低视网膜细胞自噬相关。