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find Author "朱建炜" 3 results
  • EXPRESSION AND ROLE OF KIP1 UBIQUITYLATION-PROMOTING COMPLEX 2 IN ASTROCYTES AFTER SPINAL CORD INJURY IN RATS

    ObjectiveTo explore the biological functions of Kip1 ubiquitylation-promoting complex 2 (KPC2) in the repair process of spinal cord injury (SCI) by studying the expression and cellular localization of KPC2 in rat SCI models. MethodsFifty-six adult Sprague-Dawley rats were randomly divided into 2 groups: in the control group (n=7), simple T9 laminectomy was performed;in the experimental group (n=49), the SCI model was established at T9, 7 rats were used to detect follow indexs at 6 hours, 12 hours, 1 day, 3 days, 5 days, 7 days, and 14 days after SCI. Western blot analysis was used to detect the protein expressions of P27kip1, KPC2, CyclinA and proliferating cell nuclear antigen (PCNA) after SCI. Immunohistochemistry was used to observed the cellular localization of KPC2 after SCI, double-labeling immunofluorescence staining to observe the co-localization of KPC2 with neuronal nuclei (NeuN), glial fibrillary acidic protein (GFAP) and PCNA. in vitro astrocytes proliferation model was used to further validate these results, Western blot to detect KPC2, P27kip1, and PCNA expressions. The interaction of P27kip1, KPC1, and KPC2 in cell proliferation was analyzed by co-immunoprecipitation. ResultsThe Western blot analysis showed a significant down-regulation of P27kip1 and a concomitant up-regulation of KPC2, CyclinA, and PCNA after SCI. Immunohistochemistry staining revealed a wide distribution of KPC2 positive signals in the gray matter and white matter of the spinal cord. The number of KPC2 positive cells in the experimental group was significantly higher than that in the control group (t=10.982, P=0.000). Double-labeling immunofluorescence staining revealed the number of KPC2/NeuN co-expression cells in the gray matter of spinal cord was (0.43±0.53)/visual field in the control group and (0.57±0.53)/visual field in the experimental group, showing no significant difference (t=0.548, P=0.604);in the white matter of spinal cord, the number of KPC2/PCNA co-expression cells was (3.86±0.90)/visual field in the control group and (0.71±0.49)/visual field in the experimental group, showing significant difference (t=7.778, P=0.000). And then, the number of KPC2/PCNA co-expression cells were (0.57±0.53)/visual field in the control group and (5.57±1.13)/visual field in the experimental group, showing significant difference (t=8.101, P=0.000). Concomitantly, there was a similar kinetic in proliferating astrocytes in vitro. The Western blot analysis showed a significant down-regulation of P27kip1 and a concomitant up-regulation of KPC2 and PCNA after serum stimulated. Co-immunoprecipitation demonstrated increased interactions between P27kip1, KPC1, and KPC2 after stimulation. ConclusionThe up-regulated expression of KPC2 after SCI is related to the down-regulation of P27kip1, this event may be involved in the proliferation of astrocytes after SCI.

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  • VALIDATION STUDY ON PRECISION OF DIGITIZED CUSTOM-MADE RADIAL HEAD PROSTHESIS BY THREE-DIMENSIONAL VISUALIZATION OF VIRTUAL SURGERY

    Objective To study digitize design of custom-made radial head prosthesis and to verify its matching precision by the surgery of preoperative three-dimensional (3-D) virtual replacement. Methods Six healthy adult volunteers (3 males and 3 females, aged 25-55 years with an average of 33 years) received slice scan of bilateral elbow by Speed Light 16-slice spiral CT. The CT Dicom data were imported into Mimics 10.0 software individually for 3-D reconstruction image, and the left proximal radial 3-D image was extracted, the mirror of the image was generated and it was split into 2 pieces: the head and the neck. The internal diameter and the length of the radial neck were obtained by Mimics 10.0 software measurement tools. In Geomagic Studio 12 software, the radial head was simulated to cover the cartilage surface (1 mm thickness) and generated to an entity. In UG NX 8.0 software, the stem of prosthesis was designed according to the parameters above and assembled head entity. Each custom-made prosthesis was performed and verified its matching precision by the surgery of preoperative 3-D virtual replacement. Results Comparing the morphology of 6 digitize custom-made prostheses with ipsilateral radial heads by the 3-D virtual surgery, the error was less than 1 mm. The radial head prosthesis design on basis of the contralateral anatomy was verified excellent matching. Conclusion The 3-D virtual surgery test and the digitized custom-made radial head prosthesis will be available for clinical accurate replacement.

    Release date:2016-08-31 04:12 Export PDF Favorites Scan
  • 人工股骨头置换治疗高龄股骨转子间骨折

    目的 总结人工股骨头置换治疗高龄复杂股骨转子间骨折的早期疗效。 方法 2003 年5 月-2007 年6 月,采用双动人工股骨头置换治疗高龄股骨转子间骨折36 例。男12 例,女24 例;年龄73 ~ 92 岁,平均83岁。均为跌倒后髋部着地所致骨折。骨折至手术时间3 ~ 20 d,平均8 d。按AO 分型,A1 型3 例,A2 型25 例,A3 型8 例。 结 果 36 例患者均安全渡过围手术期。获随访6 ~ 30 个月,平均18 个月。术后X线片示假体无松动、下沉及脱位,股骨近端无骨溶解或骨吸收,未发现异位骨化。随访末期Harris 评分75 ~ 93 分,平均91 分;术后评价优20 例,良12 例,可4 例,优良率88.9%。 结论 人工股骨头置换治疗高龄复杂股骨转子间骨折近期随访效果满意,但这一术式技术要求高,应严格掌握适应证。

    Release date:2016-09-01 09:19 Export PDF Favorites Scan
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