生物水凝膠體系治療兔股骨缺損的效果
[Abstract]:Aim: to establish rabbit bone marrow mesenchymal stem cells (BMSCs) isolated by whole bone marrow method in vitro, to detect the biological characteristics and multidirectional differentiation characteristics, and to observe its effects on the morphology and proliferation of rabbit bone marrow mesenchymal stem cells (BMSCs). Hyaluronic acid hydrogel was prepared and its biocompatibility and anti-degradation ability were tested. A rabbit model of middle and lower femur defect was established. The bone defects were repaired with concentrated bone marrow hemoglobin freezing and thawing hydrogel and allogeneic bone strips as implants, and the effect of biological hydrogel system on repairing rabbit femur middle and lower segment defect was discussed. Methods: (1) Rabbit bone marrow mesenchymal stem cells (BMSCs) were isolated and purified by whole bone marrow adherent cells. BMSCs were cultured in 10% fetal bovine serum culture medium. (2) the expression of specific receptors on cell surface was detected by flow cytometry. In addition, osteoblasts, chondroblasts and adipocytes were differentiated into osteoblasts, chondroblasts and adipocytes in different culture medium. (3) Hyaluronic acid (HA) hydrogel was prepared by freezing and thawing gelation. The biocompatibility of HA hydrogels was detected by observing the morphological distribution of HA hydrogels, and the anti-degradation ability of HA hydrogels was tested by in vitro degradation and in vivo embedding of BMSCs. (4) 40 experimental animals were used to study the biocompatibility of HA hydrogels. Four of them were divided into 2 groups to select the location of the model. The same area of defect was created in the right radius and the middle and lower femur, and the other 36 were randomly divided into 4 groups to establish the model of femoral defect trauma. Bone marrow blood was concentrated and HA hydrogel was prepared. Group A was implanted with biological hydrogel system. Group B was implanted with allogeneic bone and HA hydrogel complex. Group C was implanted with allogeneic bone only. Group D was implanted with autogenous iliac bone. The effect of bone repair was detected by X-ray and gross bone after operation, and the microscopic osteogenic effect was observed by making sections of repair area and HE staining. Results: (1) the primary BMSCs inoculated in vitro began to adhere to the wall 1 day after inoculation. (2) the surface antigen CD29, CD44, CD90, not CD45, CD34, was proved to be mesenchymal stem cells. (3) BMSCs was induced by three kinds of inducers and differentiated after 21 days. It was proved that three kinds of adult cells were obtained by alizarin red, phannin O and oil red O, respectively. (4) X-ray showed that the repair ability of rabbit femur was weaker after 1 month. The results of X-ray showed that the defect area of group A and group D were reduced and the boundary between bone repair area and normal bone in group A and group D were clear, and the area of repair was not up to the complete result. The results were as follows: (1) the results of X-ray showed that the defect area of group A was less than that of group A, and that of group B (group D) was significantly lower than that of group B (P < 0.05). The results of gross specimen observation were consistent with those of X-ray. Section HE staining showed that only A group A with complete internal and external periosteum continuity was found to have no difference between the repair area and the normal bone in group A and B C group during 4weeks, and there was no significant difference between the repair area and the normal bone in the group A and B C, and there was no difference between group A and B C, and no difference was found between the repair area and the normal bone in the group A and B C, and there was no significant difference between the repair area and the normal bone in group A. In group C, the repair was poor. Conclusion: the whole bone marrow adherent method can obtain high purity, strong proliferative ability, stable and uniform phenotype. BMSCs with multi-differentiation ability; hyaluronic acid hydrogel prepared by freezing and thawing gelation method can be used as a non-cytotoxic three-dimensional cell scaffold material with certain anti-degradation ability; the middle and lower femur can be used as a choice for modeling bone defect. The biomedical hydrogel system which concentrates bone marrow hydrogel and allograft bone synthesis has a positive effect on the repair of bone defect and can promote early tissue regeneration and vascular recanalization. It is a potential new technique for clinical application.
【學(xué)位授予單位】:寧波大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R68
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