殼聚糖修飾鈦骨種植體表面對(duì)雪旺細(xì)胞的影響
[Abstract]:Aim: to fix the chitosan coating on the surface of titanium implant, and to investigate the effect of chitosan coating on the early adhesion, proliferation and secretion of Schwann cells by cell experiments in vitro. Methods: chitosan was immobilized on the surface of titanium bone by crosslinking agent to make chitosan coating on the surface of titanium bone. The experiment was divided into three groups: pure cell group as blank control group, ordinary titanium bone group as negative control group and chitosan coated group as experimental group. The surface structure of the experimental group and the negative control group was observed by scanning electron microscope (SEM), the contact angle of the two groups was determined by hanging drop method, the binding strength of the chitosan coating and the titanium bone surface was measured by tensile force tester. The materials of experimental group were soaked in vitro and weighed daily to measure the time required for degradation. After co-culture with Schwann cells, the quantity of cell adhesion on the surface of the material was detected qualitatively by DAPI staining at 12 hours, and the morphology of the cells on the surface of the material was observed by scanning electron microscope at 24 hours. The effect of CCK-8 on the proliferation of Schwann cells was detected on the 1st day and 5th day, the cell count was carried out daily after co-culture with the material, the cell growth curve was drawn, and the growth state of the cells was observed intuitively. The secretion of NGF and GDNF in Schwann cells was detected by Elisa on day 1, day 2 and day 3, and analyzed statistically. Result 1. Scanning electron microscopy showed that the size of chitosan particles was about 2-5 渭 m, which was rectangular or polygon, closely arranged between particles, and tightly attached to the surface of titanium bone. The surface contact angle of chitosan coated group (Tixos-CS) is less than 90 擄, which is hydrophilic. The results of tensile test showed that the chitosan coating could adhere to the surface of titanium bone steadily. The degradation experiment showed that the coating could degrade at a uniform rate and slowly, and the degradation was completed on the 8th day. Human Schwann cells co-cultured with the two groups for 12 hours DAPI staining results showed that chitosan coated group (Tixos-CS) cell adhesion number of more than 6. After 24 hours of co-culture, the morphology of cells on the surface of chitosan coated group (Tixos-CS) was observed by scanning electron microscope. The absorbance values of the chitosan coated group (Tixos-CS) were higher than that of the titanium bone group (Tixos) on the 1st and 5th day. The growth curve showed that the growth retardation of Tixos cells was from 3 to 6 days after passage, and that of the chitosan coated group (Tixos-CS) from the first day to the first day was the slow growth period (2-5 days), the second day was the rapid growth period (5 days), and the latter was 9 days after the flattened stage. The growth curve showed that the growth retardation period of Tixos group was 3 to 6 days, and that of the chitosan coated group (Tixos-CS) was 2 to 5 days after rapid growth. The percentage of Schwann cells in the S G 2 / M phase in the chitosan coated group (Tixos-CS) was significantly higher than that in the titanium bone group (Tixos). The results of Elisa showed that the percentage of Schwann cells in the chitosan coated group (Tixos-CS) was significantly higher than that in the Tixos group. Both NGF and GDNF secreted by chitosan coated group (Tixos-CS) were higher than those of titanium bone group (Tixos). Conclusion 1. The chitosan coating fixed on the surface of titanium bone has a certain spatial stereoscopic structure, the coating has a certain mechanical strength, a certain stability, and can be degraded slowly. Chitosan coating can promote the adhesion and proliferation of Schwann cells, and promote the secretion of NGF and GDNF by Schwann cells.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:R783.6
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