兔动静脉短路环法诱导组织工程骨支架材料血管生成的初步研究

Objective To compare the effects of 2 vascular carriers, arteriovenous loop and arteri-ovenous bundle, on inducing angiogenesis in coral scaffold of vascularized tissue-engineered bone in animal models.Methods Thirty-six adult male New Zealand rabbits were randomized into 2 even groups.In group A, an arteriovenous loop (AVL) was formed by microsurgical anastomosis at the proximal ends between the femoral poptiteal artery and vein, and placed in the circular side groove of the coral block (6 mm × 8 mm × 10 mm) .In group B, flow-through vessels bundles of both femoral artery and vein were placed in the side grooves of the coral block.All the implants in 2 groups were wrapped by a micro-porous expand-ed-polytetrafluoroethylene (ePTFE) membrane, and fixed subcutaneously by suturing.Evaluation methods included gross morphological observations, histological examinations, India ink perfusion and vascular casting after 2, 4, 6 weeks.The density of blood vessels was analyzed by the statistical software SPSS 10.0.Results All the corals were encased by newly formed fibrovascular tissues in 2 groups.Ink-stained vessels distributed the surfaces and side grooves, and invaded the interspaces of corals.The degree of vascularization increased over the course of experiment.Blood vessel density demonstrated a significant continuous increase between 2 and 6 weeks after implantation in group A.The mean value of blood vessel density in group A (2 weeks 276.60±4.67, 4 weeks 517.20±10.66, 6 weeks 707.00 ±11.87) was significantly higher than in group B (2 weeks 153.60 ±7.16, 4 weeks 269.40±6.80, 6 weeks 279.20±6.53) (P <0.01).Vascular casting showed that in group A, significant blood vessels sprouted from all areas of the loop, espe-cially at the entrance of the arteriovenous pediele where the small tubes were densely interconnected.In group B, however, no blood vessels sprouted from the arteriovenous bundles and only some small vessels grew from the entrance and exit.Conclusions A vascularized coral model can be constructed by inserting an ar-teriovenous loop or an arteriovenous bundle, useful in vascular bone tissue engineering.The former, however, have stronger abilities to induce angiogenesis than the latter.     

应用骨形成蛋白治疗骨缺损的新进展

本文对近年来骨形成蛋白治疗骨缺损的实验研究和临床应用，从骨代用品中的重要诱骨成分，组织工程中的骨特异生长因子和临床应用病例等方面，着重进行介绍。     

下颌牵张成骨中应用神经生长因子对神经损伤修复的作用

目的研究下颌骨牵张成骨中全身注射神经生长因子(NGF)对损伤的下齿槽神经的修复作用。方法新西兰白兔48只,全麻下行双侧下颌骨牵张成骨术,术后第4天以0.5mm/12h的速度牵张,共10天。术后即分别给予肌注NGF0.6μg/d×20天和相当量生理盐水。采用BL-420F生物机能实验系统及检测设备,分别在术前、牵张期结束、固定期1、2、4周时行感觉神经动作电位(SNAP)测试。结果在牵张完成时、固定期1周,NGF组和对照组的SNAP波幅和潜伏期无统计学差异;在固定期2、4周,NGF组波幅明显高于对照组,而潜伏期明显低于对照组(P0.05)。结论全身注射NGF有利于牵张成骨中下齿槽神经功能的恢复。     

隧道式颈阔肌瓣修复颊部黏膜大面积缺损的临床分析

目的:应用一种新的颈阔肌瓣术式修复大面积颊黏膜缺损.方法:通过设计蒂部隧道,加宽蒂部宽度,获得血供稳定的颈阔肌瓣,修复6 例大面积颊部黏膜缺损.结果: 9 例颊黏膜缺损修复中, 6 例全部成活, 3 例部分坏死.结论:蒂部加宽、保留血供的隧道式颈阔肌瓣,可修复距离供区较远面积较大的口腔内软组织缺损.     

先天性舌体发育不良(非综合征型)1例报道及文献回顾

先天性舌体发育不良在临床中十分罕见。该文报道1例先天性舌体发育不良患儿的病情,并通过查阅文献,详细分析舌体发育畸形的可能机制,为孕早期对该病预防提供依据。根据当前学科发展条件,尝试提出适合该类疾病的姑息治疗方案,尤其提出了无舌畸形的序列治疗和心理管理,以期能提升该类疾病患儿的生活质量,并为临床工作者提供一定的参考。     

脂肪细胞型脂肪酸结合蛋白与代谢综合征相关

Serum adipocyte fatty acid-binding protein (A-FABP) was raised in metabolic syndrome (MS)patients (n= 121) as compared with age-matched healthy subjects [n = 120, (14.7±4.8 vs 6.8 ±3. 0) μg/L,P<0.001]. It reached higher level in MS subjects with visceral obesity [(15.7±4.2 vs 12.6±5.1) μg/L, P<0.001]. Serum A-FABP concentration was positively correlated with body mass index, waist circumference, waist-tohip ratio, fasting insulin, homeostasis assessment for insulin resistance (HOMA-IR), fasting glucose, triglycerides,total cholesterol,and mean arterial blood pressure, whereas negatively correlated with HDL-C (r =-0. 448, P< 0.001).     

破骨细胞分化因子和破骨细胞生长抑制因子在牙周组织细胞中的表达

目的:检测炎症前细胞因子IL- 1β和骨成熟因子PGE2 对人牙周膜细胞和牙龈成纤维细胞破骨细胞分化因子(osteoclast differentiation factor,ODF)和破骨细胞生长抑制因子(osteoclastogenesis inhibitory factor,OCIF)表达的影响.方法:用RT- PCR和Southern- blot对该2 种细胞在IL- 1β或PGE2作用下细胞中ODF和OCIF mRNA的表达进行半定量.结果:上述2 种细胞在IL- 1β或PGE2作用下,ODF和OCIF的合成均有升高,各细胞合成ODF和OCIF的峰值随IL- 1β或PGE2作用时间和浓度的不同而发生变化.结论:牙周组织中ODF和OCIF可能同时参与炎症反应,并受致炎因子IL- 1β和骨代谢因子PGE2调节.     

非血管化髂骨移植同期种植实验

AIM:To investigate the osseointegration process of titanium implant and non vascularized iliac bone grafts.METHODS:12 mongrel were divided into 4 groups randomly.Bone grafts were resected from iliac crest and then transplanted to the other side.Animals were skilled in different time after surgery,X ray pictures were taken,then histological observation were done.RESULTS:At 3rd week,bone grafts dissolved,resorbed or necrosis partly;At 6th week,new bone began to regenerated;At 9th week,the amount of new bone increased;At 12nd week,bone interface around implant formed,without soft tissue interrupt.CONCLUSION:Osseointegration can formed between non vascularized iliac bone grafts and titanium implant.     

牙龈卟啉单胞菌红血球凝集素B蛋白纯化和鉴定

目的:牙龈卟啉单胞菌(Porphyromonas gingivalis,Pg)是牙周炎的重要病原菌。该菌膜表面蛋白-红血球凝集素参与细菌黏附和入侵宿主细胞的过程。本研究目的是纯化和鉴定Pg381膜表面红血球凝集素-B(hemagglutinin B,HagB),为能进一步研究该蛋白的特性做准备。方法:HagB基因构建在载体pQE31上,用E.coliM15蛋白表达株通过Ni-NTA亲和柱来表达,表达带有Histag的目的蛋白,做蛋白测序鉴定,制备并筛选相应的抗体。结果:本实验通过分子生物学技术,纯化出目的蛋白HagB,经过抗原免疫,得到相应的单克隆抗体。结论:本实验中的E.coliM15[pREP4]pQE-31-TX1大肠杆菌表达系统能有效地表达HagB蛋白。