羟基磷灰石涂层改善骨内植物界面促进骨整合

BACKGROUND: We have designed and manufactured a novel artificial cervical vertebra and intervertebral complex (ACVC) which combines the cervical titanium cage with the artificial cervical disc, and also developed the ACVC with a hydroxyapatite biocoating (ACVC-HA). OBJECTIVE: To evaluate biomechanical properties of the joint system, and the role of HA coating in promoting osseointegration and long-term stability. METHODS: Twenty-four goats were randomly divided into three groups and underwent the anterior C _2/3 and C _3/4 discectomy, and C₃ subtotal corpectomy, followed by ACVC implantation (group 1) and ACVC-HA implantation (group 2), and given no intervention (black control group), respectively. group. At 12 weeks after surgery, C _1-5 samples were collected to undergo biomechanical tests and histological staining. RESULTS AND CONCLUSION: Prior to the fatigue test, compared with the blank control group, the range of motion and neural zone of groups 1 and 2 in the directions of flexion-extension and lateral bending showed no significant differences, but the above indicators were significantly increased in the direction of rotation (P < 0.05). Additionally, the stiffness in all three directions was significantly lower than that in the blank control group (P < 0.05). There were no significant differences in the range of motion and neural zone in all directions between groups 1 and 2. Similar results were found after the fatigue test. The histological staining showed that both two implants had good biocompatibility and abradability, but more new bone formed on the ACVC-HA. These results suggest that ACVC can effectively reconstruct the motor function of the cervical spine after decompression. Furthermore, HA coating can markedly improve bone-implant interface to promote osseointegration.     

γ-分泌酶抑制剂通过Notch信号通路抑制人骨肉瘤细胞的迁移

目的 探究γ-分泌酶抑制剂DAPT对人骨肉瘤143B细胞和MG63细胞迁移的影响.方法 首先采用免疫荧光和免疫组化分别检测MG63细胞、143B细胞和人骨肉瘤体内肺转移临床标本Notch1的表达情况,再用DAPT和Notch通路的激动剂Jagged1处理143B细胞和MG63细胞,分别用划痕试验和Transwell迁移...