No abstract

After spinal cord injury, more neurogenic bladder function is caused. The purpose of this article is to investigate the possible mechanism of placental mesenchymal stem cell-derived neural cell transplantation on the recovery of neurogenic bladder function after spinal cord injury. 50 SPF Wistar rats were selected to establish a spinal cord injury rat model and divided into experimental groups and in the control group, 25 animals in each group, the experimental group was transplanted with placental mesenchymal stem cell-derived nerve cells, and the urodynamics and TUNEL positive rate were compared. The results of the study showed that compared with the control group, the maximum bladder capacity and bladder compliance of the experimental group increased significantly (P<0.01), and the bladder basic pressure and urinary leakage pressure decreased (P<0.05). The values of these four items are 2.318ml, 28.892cm H2O, 46.34cm H2O, and 0.1389ml/cm H2O, respectively. It can be seen that the transplantation of neural cells derived from placental mesenchymal stem cells is of great significance for the recovery of neurogenic bladder function after spinal cord injury.

Background As commonly bone defect is a disease of jaw that can seriously affect implant restoration, the bioactive scaffold can be used as potential systems to provide effective repair for bone defect. Purpose A osteoinductive bone tissue engineering scaffold has been prepared in order to explore the effect of bioactive materials on bone tissue engineering. Methods In this study, NELL-1 nanoparticles (Chi/NNP) and nano hydroxyapatite were incorporated in composite scaffolds by electrospinning and characterized using TEM, SEM, contact angle, tensile tests and in vitro drug release. In vitro biological activities such as MC3T3-E1 cell attachment, proliferation and osteogenic activity were studied. Results With the addition of nHA and nanoparticles, the fiber diameter of PCL/BNPs group, PCL/NNPs group and PCL/nHA/NNPs group was significantly increased. Moreover, the hydrophilic hydroxyl group and amino group presented in nHA and nanoparticles had improved the hydrophilicity of the composite fibers. The composite electrospun containing Chi/NNPs can form a double protective barrier which can effectively prolong the release time of NELL-1 growth factor. In addition, the hydroxyapatite/NELL-1 nanoparticles electrospun fibers can promote attachment, proliferation, differentiation of MC3T3-E1 cells and good cytocompatibility, indicating better ability of inducing osteogenic differentiation. Conclusion A multi-functional PCL/nHA/NNPs composite fiber with long-term bioactivity and osteoinductivity was successfully prepared by electrospinning. This potential composite could be used as scaffolds in bone tissue engineering application after in vivo studies.