脊髓损伤(SCI)会对脊髓神经元结构和功能产生毁灭性伤害,导致患者在受损点以下运动和感觉功能丧失,使患者遭受巨大的经济负担和无尽的痛苦。 SCI可分为两个阶段:原发性和继发性损伤。原发性损伤的原因是机械损伤后脊髓及其周围血管组织的破坏导致局部水肿、缺血和缺氧。继发性损伤的主要诱因是原发性损伤引起的局部缺血和缺氧,从而引起炎症细胞浸润以及神经元凋亡和坏死。因此,缺血和缺氧有可能加重病理过程并阻碍SCI的恢复。 Fig. 1. Schematic illustration of the preparations of prevascularized cell sheet, PNC, SCI model, and the implantation of PNC into the SCI rat. Fig. 2. Photographs of MSC cell sheet (a); prevascularized MSC cell sheet (b); rolling into NPNC based on MSC cell sheet (c); rolling into PNC based on prevascularized MSC cell sheet (d); NPNC based on MSC cell sheet after removal from the PTFE model (e); PNC based on the prevascularized MSC cell sheet after removal from the PTFE model (f). Fig. 3. SEM images of NPNC (a and c) and PNC (b and d) at different magnifications, and the cross profile images of NPNC (e) and PNC (f). Fig. 4. Immunofluorescence images stainedwith Collagen I (a, NPNC; b, PNC), Fibronectin (c, NPNC; d, PNC), and CD31 (e,NPNC; f, PNC). The white lines denote the ordered arrangement of relatedproteins. The white circles denote the microvessel (scale bar = 200 μm). (Forinterpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) Fig. 5. BBB scores: BBB scores of the control group, NPNC group, and PNC group (∗ : P < 0.05 vs. blank group). Fig. 6. Light microscopic images of H&E staining. a, Control group at 2 weeks; b, NPNC group at 2 weeks; c, PNC group at 2 weeks; d, Control group at 8 weeks; e, NPNC group at 8 weeks; f, PNC groupat 8 weeks (scale bar = 100 μm). Fig. 7. H&E staining images of the injured site. a, Control group at 2 weeks; b, NPNC group at 2 weeks; c, PNC group at 2 weeks; d, Control group at 8 weeks; e,NPNC group at 8 weeks; f, PNC group at 8 weeks. A, denotes the astrocyte; F, denotes the neuron; N, denotes the neuron fibers; V, denotes the vacuole (scale bar = 200 μm). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) 本研究由兰州大学口腔医学院范增杰教授团队和甘肃科学院传感技术研究所的Yingying Nie教授团队合作完成,并于2019年10月31日在线发表于Acta Biomaterialia。 论文信息:Zengjie Fan*, Xiaozhu Liao, Yu Tian, Xie xuzhuzi , Yingying Nie*. A prevascularized nerve conduit based on a stem cell sheet effectively promotes the repair of transected spinal cord injury. Acta Biomaterialia In press. 供稿:余颖康 审校:朱彩虹 编辑:丁路光 |
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