脂肪细胞型脂肪酸结合蛋白与代谢综合征相关

代谢综合征(MS)组(n=121)的血清脂肪细胞型脂肪酸结合蛋白(A-FABP)水平较对照组(n=120)显著升高[(14.7±4.8 vs 6.8±3.0)μg/L,P<0.001].腹型肥胖MS患者的血清A-FABP水平较非腹型肥胖MS患者显著升高[(15.7±4.2 vs 12.6±5.1)μg/L,P<0.001].血清A-FABP水平与体重指数、腰围、腰臀比、空腹胰岛素、稳态模型评估的胰岛素抵抗指数、空腹血糖、甘油三酯、总胆同醇及平均动脉压等指标均呈正相关(r分别为0.603、0.534、0.411、0.424、0.401、0.370、0.460、0.208和0.522,均P<0.05),而与HDL-C旱显著负相关(r=-0.448,P<0.001).     

高速破片冲击猪下颌骨对颞下颌关节损伤机制的研究

目的:研究不同速度的破片冲击猪下颌骨对其颞下颌关节损伤的力学机制.方法:采用离体新鲜猪头12 只,分为3 组(n=4),分别用1 g圆柱形破片在900、1 200、1 500 m/s下对其右侧下颌角部进行冲击,测量双侧下颌角部、额部的加速度和双侧髁突颈部应变的数据,分析各部位的受力特点.结果:迎弹侧、对侧和颅部加速度之间的比值在低速组为8:1.9:1,在中速组约为9.9:2:1,在高速组约为10.2:2:1.迎弹侧和对侧髁状突颈部应变的比值在低速组约为2.87,在中速组约为2.43,在高速组约为1.70.结论:在下颌骨受到来自侧向的高速破片冲击时,引起髁突颈部线性骨折的侧向力和关节窝损伤的轴向力主要作用在迎弹侧,在对侧也未大量衰减.     

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.     

三维多孔β-磷酸三钙支架与骨髓基质细胞构建组织工程骨的生物相容性及显微形态学观察

目的:定量及显微观察三维多孔β-磷酸三钙支架在构建组织工程骨时的组织相容性。方法:实验于2002-07/2005-07在第四军医大学口腔医学院颌面外科组织工程实验室完成。将兔的骨髓基质细胞,按一定量分置在培养板的各孔内,将多孔β-磷酸三钙支架材料置入孔内共培养,采用MTT法和碱性磷酸酶试剂盒检测骨髓基质细胞活性,共聚焦显微镜观察其在β-磷酸三钙支架表面的微观形态。结果:①倒置显微镜下观察接种前的细胞形态基本均匀一致。②接种后6d扫描电镜观察显示,材料表面可见较多细胞和细胞合成的丝状细胞外基质。③细胞接种后6d激光共聚焦显微镜观察显示,细胞数量明显增多,基本长满材料的表面,同时在孔隙中,也有大量细胞长入。④β-磷酸三钙对骨髓基质细胞的增殖作用:培养第5天,β-磷酸三钙组对骨髓基质细胞的增殖作用(A)低于对照组,差异有显著性意义(分别为0.47±0.02,0.52±0.02,t=2.281,P<0.05)。⑤β-磷酸三钙对骨髓基质细胞的碱性磷酸酶的活性比较:在骨髓基质细胞诱导培养5,7,9d,β-磷酸三钙组碱性磷酸酶的活性(A)明显低于对照组,差异有显著性意义(分别为5.18±0.31,6.05±0.54;12.35±0.62,14.17±0.70;15.68±0.87,17.13±1.14,t=3.302,6.025,6.019,P<0.05)。结论:三维多孔β-磷酸三钙支架有良好的组织相容性,为其应用于临床提供了可靠的实验依据。     

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).     

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).     

异种脱细胞真皮基质修复口腔颊部肿瘤切除后组织缺损的临床观察

目的:探讨异种脱细胞真皮在口腔颊部肿瘤切除后组织缺损修复中的应用方法、效果及长期观察的评价。方法:收集2006年4月～2009年5月口腔颊部肿瘤切除后组织缺损应用异种脱细胞真皮基质修复膜进行修复的19例患者资料。术后进行追踪随访和功能评价。结果:术后随访6～24个月,平均15个月。19例患者的组织缺损修复均获得成功,术后7～10天均未见修复膜脱落,愈合良好,植入异种生物膜部位逐渐为自体膜组织长入。长期观察,活化后的修复膜在软组织部位受植床存在一定的收缩。结论:生物膜修复组织缺损的机理与传统的植皮方法不同,是生物支架功能,异种脱细胞真皮基质适合口腔颊部肿瘤切除后浅、中层组织缺损的修复。     

流体剪切力促进大鼠髁突软骨细胞凋亡的实验研究

目的:观察流体剪切力(fluid flow shear stress,FFSS)刺激下大鼠原代髁突软骨细胞发生凋亡的特点.方法:采用16 dyn/cm2的FFSS刺激原代髁突软骨细胞0.5、1、2及4 h,用钙显色试剂盒检测细胞内钙离子(Ca2+)的变化;钙蛋白酶(Calpain)活性检测试剂盒检测Calpain的活性...     

复合骨预制髂骨瓣的实验研究

目的　探讨将一定形状的重组人骨形态发生蛋白 - 2 (rh BMP- 2 )、胶原、珊瑚复合骨植入狗髂骨区 ,预制一定形状和结构的骨组织瓣的可行性。方法　将复合骨植于狗髂骨区 ,同期植入钛种植体 ,3个月、4个半月取材。通过体视学、X线片及组织学等观测指标 ,分析应用 rh BMP- 2、胶原、珊瑚复合骨预制组织瓣的可行性。结果　复合骨植于狗髂骨区 ,3个月时 ,复合骨已转变成骨组织 ,髂骨形状改变 ,并带有种植体 ,种植体与新骨间是骨界面 ;4个半月时新生骨改建为成熟骨。结论　 rh BMP- 2、胶原、珊瑚复合骨适用于体内预制具有一定形状和结构的骨组织瓣。     

下颌骨节段性缺损三种髂骨重建方法的疗效比较

下颌骨节段性缺损三种髂骨重建方法的疗效比较马秦毛天球刘宝林顾晓明下颌骨常因外伤、炎症、肿瘤切除术后遗留骨的部分缺损，尤其是节段性缺损，会引起不同程度功能丧失和面部畸形。近年来临床上应用自体髂骨修复下颌骨缺损的报道很多。本文对应用三种自体髂骨修复下颌骨...