去势大鼠骨髓基质干细胞分离培养鉴定及增殖特性的变化

目的:对去势大鼠骨髓基质干细胞(BMSCs)进行分离培养鉴定,研究去势后大鼠BMSCs增殖特性的变化.方法:以去势大鼠作为绝经后骨质疏松症模型,分为去势组和假手术组.密度梯度离心分离骨质疏松大鼠的BMSCs,利用BMSCs的多向分化培养及流式细胞仪分析对去势大鼠BMSCs进行鉴定,倒置相差显微镜观察细胞增殖情况,MTT法测量两组BMSCs增殖能力.结果:去势组大鼠体质量、雌二醇及整体股骨骨矿物质密度(BMD)与假手术组比较差异有显著性(P＜0.01),诱导培养后两组大鼠BMSCs油红O染色和Von Kossa's染色实验阳性,流式细胞仪显示骨髓间充质细胞具有的表面抗原CD29和CD44阳性而造血干细胞具有的表面抗原CD45和CDl33为阴性.MTT法测定在7 d内,去势组细胞的增殖速率要高于假手术组.结论:成功建立了大鼠骨质疏松模型.采用成骨诱导和成脂诱导也进一步证实了所分离的细胞为具有多向分化潜能的BMSCs.去势后3mo大鼠BMSCs增殖能力增强.     

MMSCs移植对大鼠心肌梗死后MMP-2,TIMP-2表达及心室重构的影响

目的:研究骨髓间充质干细胞(MMSCs)移植对实验性心肌梗死(MI)大鼠心肌细胞外基质金属蛋白酶(MMP-2)和基质金属蛋白酶抑制剂(TIMP-2)的表达及心室重构的影响.方法:采用开胸结扎冠状动脉左前降支(LAD)的方法制作MI大鼠模型,造模成功后12～14d经大鼠舌下静脉移植已转染增强型绿色荧光蛋白(pEGFP-C1)的MMSCs,分4,8wk2个时段检测大鼠左心及全心质量指数、胶原含量及MMP-2,TIMP-2的量效变化,荧光显微镜观察绿色荧光的表达.结果:4wk时移植组左心质量指数为[(1.69×10-3)±(11.02×10-5)],全心质量指数为[(2.22×10-3)±(5.08×10-5)]均较同期模型组[(1.83×10-3)±(9.48×10-5)],[(2.47×10-3)±(17.16×10-5]显著降低(P<0.01).8wk时其变化趋势与4wk时相同.4wk时移植组的胶原含量为(11.19±1.15)%较同期模型组的胶原含量(27.89±5.59)%显著降低(P<0.01),8wk时变化趋势与4wk时相同.移植组MMP-2的表达显著低于同期模型组中MMP-2的表达,而TIMP-2的...     

骨髓源性肝干细胞的研究进展

肝干细胞用于肝病治疗的研究日益增多,尤其是骨髓分离骨髓源性肝干细胞。文章就骨髓源性肝干细胞的分离、培养、纯化、诱导分化、检测及肝内移植的可能机制和应用前景进行综述。     

高频超声对Ⅱ型糖尿病周围神经病变患者腓总神经的临床观察

目的 探讨高频超声观察Ⅱ型糖尿病周围神经病变患者腓总神经的临床价值。方法 选取62例2型糖尿病患者,分为周围神经病变组32例和无周围神经病变组30例,并选择同期28例非糖尿病患者作为对照组,应用高频超声观察各组腓管处腓总神经图像变化,测量并比较腓总神经前后径、横径及横截面积,并结合神经电生理检查进行相关性分析。结果 周围神经病变组腓总神经前后径、横径及横截面积较无周围神经病变组和对照组均增大,差异均有统计学意义（均P＜0.05）。糖尿病伴周围神经病变组患者腓总神经的横截面积与腓总神经感觉传导速度呈显著负相关（r=-0.552,P＜0.01）。结论 高频超声能显示糖尿病合并周围神经病变患者腓总神经的异常改变,为临床诊断提供客观依据。     

左、右半结肠癌骨转移病理特征及预后分析

目的:比较左半结肠癌（LSCC）和右半结肠癌（RSCC）骨转移的病理特征和临床预后差异。方法:对漯河市中心医院2007年1月至2015年12月收治的103例结肠癌骨转移病例资料进行回顾性分析,据解剖位置将64例纳入LSCC组,39例纳入RSCC组,对比分析其病理学特征,绘制并分析生存曲线,筛选预后因素。结果:RSCC骨转移相对LSCC表现为:CA199 阳性率高、年龄大、分化程度更差、分期更晚、预后更差。单因素分析结果示原发肿瘤位置、TNM分期、LDH水平、ALP水平是影响结肠癌骨转移3年生存的相关因素。Logistic多因素回归分析显示原发肿瘤位置、TNM分期、ALP水平是结肠癌骨转移的独立危险因素。结论:左、右半结肠癌在病理特点、临床表现、生物学行为、生存预后等方面存在差异,本文为区分左、右半结肠癌骨转移的不同病理特征及预后评价提供了依据。     

Biocompatibility evaluation of dicalcium phosphate/calcium sulfate/poly (amino acid) composite for orthopedic tissue engineering in vitro and in vivo

In vitro cytocompatibility of ternary biocomposite of dicalcium phosphate (DCP) and calcium sulfate (CS) containing 40 wt% poly (amino acid) (PAA) was evaluated using L929 ?broblasts and MG-63 osteoblast-like cells. Thereafter, the biocompatibility of biocomposite in vivo was investigated using an implantation in muscle and bone model. In vitro L929 and MG-63 cell culture experiments showed that the composite and PAA polymer were noncytotoxic and allowed cells to adhere and proliferate. The scanning electron microscope (SEM) confirmed that two kinds of cells maintained their phenotype on all of samples surfaces. Moreover, the DCP/CS/PAA composite showed higher cellular viability than that of PAA; meanwhile, the cell proliferation and ALP activity were much higher when DCP/CS had added into PAA. After implanted in muscle of rabbits for 12 weeks, the histological evaluation indicated that the composite exhibited excellent biocompatibility and no inflammatory responses were found. When implanted into bone defects of femoral condyle of rabbits, the composite was combined directly with the host bone tissue without fibrous capsule tissue, which shown good biocompatibility and osteoconductivity. Thus, this novel composite may have potential application in the clinical setting.     

Inflammation and arthritis: perspectives of the glycobiologist

This review focuses on the role of glycosylation during the development of joint inflammation and degeneration. Although glycoproteins and glycan-binding proteins have essential functions in bone and cartilage, and in the inflammatory process, their exact roles are still uncertain due to the vast complexity of carbohydrate structures. Glycosylated epitopes have been shown to play a role in the induction of arthritis in animal models. Currently available drugs are aimed at the protection of cartilage and bone structures but new developments in this area should take into account the tight and specific interactions between bone and cartilage. It is anticipated that new agents will help to remodel damaged joints, based on knowledge of cartilage and bone turnover and on the exact role of glycosylated molecules and cell surface receptor glycoproteins in these processes. Highly sensitive imaging techniques and well-characterized In vivo models will accelerate this development.