抗突变型瓜氨酸波形蛋白抗体在类风湿关节炎中的诊断价值

目的 通过与类风湿因子(RF)、抗环瓜氨酸肽(CCP)抗体的比较,探讨抗突变型瓜氨酸波形蛋白(MCV)抗体对类风湿关节炎(RA)的诊断价值,方法采用酶联免疫吸附试验(ELISA)定量检测177例RA患者、46例其他风湿性疾病患者及48名健康对照者血清中抗MCV水平,并同时测定血清中抗CCP抗体、RF水平.采用t检验和χ2检验.结果 抗MCV抗体在RA组、疾病对照组及健康对照组的抗体平均滴度依次为(523±376)、(96±55)、(34±18)U/ml;此外,通过ROC曲线计算曲线下面积来确定最佳阳性阈值(分别以20、40、60、80、100、120、140 U/ml),结果为0.521、0.706、0.769、0.791、0.816、0.826、0.822.其中以抗MCV抗体≥120 U/ml为阳性阈值临床诊断效能最大.所以本研究以抗MCV抗体≥120U/ml为阳性阈值,对RA诊断的敏感性为78.0%,特异性为87.2%,阳件预测值及阴性预测值分别为92.0%和67.8%;抗MCV抗体对RA诊断的特异性与抗CCP抗体相当,但敏感性高于抗CCP抗体;与RF相比较,抗MCV抗体的敏感性和特异性均高于前者.抗MCV抗体联合抗CCP抗体或RF或三者联合检测对诊断RA的特异性提高到95.7%;此外,67例抗CCP抗体阴性的RA患者中有32例抗MCV抗体阳性,占55.2%,59例RF阴性的RA患者中有31例抗MCV抗体阳性,占52.5%.结论 抗MCV抗体可以作为RA的临床诊断血清学指标之一,与抗CCP抗体、RF联合柃测可提高对RA诊断的特异性.     

端脑腹侧的胆碱能前体细胞的胚胎来源

目的为探索胆碱能神经元的胚胎来源,验证放射状胶质细胞是否表达乙酰胆碱转移酶。方法通过对孕14天（E14）大鼠胚胎端脑冠状石蜡切片进行波形蛋白（放射状胶质细胞标志性蛋白,vimentin）和乙酰胆碱转移酶（胆碱能神经元的标志性蛋白ChAT）双重荧光免疫组织化学染色,并通过重叠同一视野内的荧光双染的图片来精确地体现放射状胶质细胞表达ChAT的位置。结果 E14大鼠端脑腹侧脑室区有部分组织呈vimentin/ChAT免疫化学双染阳性,这和资料中证实的胆碱能神经元E14天出现于第三脑室的腹背侧部的结论是一致的。结论 E14大鼠端脑内的放射状胶质细胞表达ChAT。表明放射状胶质细胞具有神经干细胞性质,它不断地进行不对称分裂,产生胆碱能表型的成神经细胞,即胆碱能前体细胞。     

The Effects of botulinum toxin A on muscle histology during distraction osteogenesis

Distraction osteogenesis is a highly successful method of bone formation, yet muscle fibrosis and contractures can result in significant morbidity. In the current study, we investigate the efficacy of botulinum toxin A in preventing fibrosis and potentially increasing muscle development in distracted muscles. Fifteen New Zealand White rabbits underwent tibial distraction at 1.5 mm/day until a 20% gain was achieved. Treatment groups were divided by drug (saline or botulinum toxin) and target muscle (gastrocnemius or tibialis anterior). Two additional control animals received no treatment. Bromeodeoxyuridine was delivered continuously throughout the 8‐week experiment, and following muscle harvest. Tissues were stained for BrdU, Pax‐7, vimentin, and haematoxylin and eosin staining. Mitotic activity increased in all distracted animals; however, in the animals receiving botulinum toxin A injections into the gastrocnemius, the antagonist tibialis anterior suffered up to 9% less fibrosis than distraction alone (p = 0.024). Use of botulinum A toxin did not appear to promote or improve neogenesis of muscle fibers, nor did it decrease fibrosis in the injected muscles. It appears from this study, and a previously published study on the effects of this toxin on muscle function, that botulinum A toxin maybe of some benefit in decreasing morbidity in the antagonist muscle but not the muscle injected with the toxin. © 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27:310–317, 2009     

离心运动对大鼠骨骼肌细胞增殖和波形蛋白表达的时序性影响

背景：骨骼肌损伤后是通过肌卫星细胞的增殖形成新核来生长和修复的,但关于骨骼肌细胞增殖和波形蛋白表达的关系很少报道。 目的：探讨骨骼肌细胞增殖与波形蛋白表达的关系以及运动性骨骼肌微损伤后修复的机制。 设计、时间和地点：随机对照动物实验,于2007-12/2008-09在湖南师大运动人体科学实验中心完成。 材料：健康成年8周龄雄性SD大鼠50只,随机分成对照组和运动后即刻、运动后3 h、运动后24 h和运动后48 h组,每组10只大鼠。 方法：运动组大鼠进行重复3 d的力竭性离心运动,力竭模型采用跑台运动,速度为16 m/min,坡度为-16°,持续运动至力竭,对照组为正常大鼠,未做运动。 主要观察指标：运动组分别于运动后即刻,3,24,48 h取材,对照组一次性取材,免疫组织化学法检测各组大鼠肱三头肌内侧头不同恢复时相增殖细胞核抗原PCNA的表达和波形蛋白的表达。 结果：骨骼肌细胞增殖出现时序性变化,运动后即刻增殖指数显著大于对照组,运动后24 h达到峰值,运动后48 h增殖指数有所下降。骨骼肌细胞中波形蛋白表达出现时序性,而且其免疫反应分值的时序性与增殖指数出现一致性,但与增殖指数不具有相关性。 结论：3 d重复性力竭离心运动后骨骼肌细胞增殖和波形蛋白的表达出现时序性变化。波形蛋白的表达与肌细胞增殖具有一定的关系,但不是惟一的影响的因素。     

上皮-间质转化与胰腺癌生物学行为的关系

目的探讨上皮-间质转化(EMT)在胰腺癌浸润转移中的作用。方法采用免疫组织化学PV 6000法检测47例胰腺癌组织上皮-钙黏蛋白(E-cad)和波形蛋白(Vim)的表达。把E-cad阴性-Vim阳性表达作为癌细胞发生EMT的免疫表型。结果 47例胰腺癌组织中E-cad和Vim阳性率分别为46.8%、23.4%,其中E-cad阴性-Vim阳性表达7例,EMT发生率为19.1%。EMT发生率与胰腺癌的分化程度和转移有关(χ2=6.73、4.06,P<0.05),与临床分期和1年生存率无关(χ2=3.56、2.72,P>0.05)。结论 EMT在胰腺癌的分化、浸润和转移过程中起重要作用。     

Quantitative evaluation of vimentin expression in tumour stroma of colorectal cancer

Recent studies have identified vimentin, a type III intermediate filament, among genes differentially expressed in tumours with more invasive features, suggesting an association between vimentin and tumour progression. The aim of this study, was to investigate whether vimentin expression in colon cancer tissue is of clinical relevance. We performed immunostaining in 142 colorectal cancer (CRC) samples and quantified the amount of vimentin expression using computer-assisted image analysis. Vimentin expression in the tumour stroma of CRC was associated with shorter survival. Overall survival in the high vimentin expression group was 71.2% compared with 90.4% in the low-expression group (P=0.002), whereas disease-free survival for the high-expression group was 62.7% compared with 86.7% for the low-expression group (P=0.001). Furthermore, the prognostic power of vimentin for disease recurrence was maintained in both stage II and III CRC. Multivariate analysis suggested that vimentin was a better prognostic indicator for disease recurrence (risk ratio=3.5) than the widely used lymph node status (risk ratio=2.2). Vimentin expression in the tumour stroma may reflect a higher malignant potential of the tumour and may be a useful predictive marker for disease recurrence in CRC patients.     

Areca nut extract upregulates vimentin by activating PI3K/AKT signaling in oral carcinoma

J Oral Pathol Med (2011) 40 : 160–166 Background: Areca nut is a group I carcinogen. Areca nut extract (ANE) is known to activate signaling pathways in oral epithelial cells. Activation of the serine/threonine protein kinase AKT/pKB (AKT) signaling pathway is known to be important during the neoplastic process. Vimentin is a mesenchymal intermediate filament and a regulator of tumor progression. This study investigated the impact of ANE on PI3K/AKT activation during vimentin expression. Materials and methods: Oral carcinoma cells were treated with ANE to explore the signaling changes underlying vimentin expression. Oral carcinoma tissues were subjected to immunohistochemical analysis to study the implications that vimentin expression has on patient survival. Results: After ANE treatment, the OECM‐1 and Fadu cells developed a fibroblastoid morphology and there was an increase in vimentin expression. The treatment also induced the phosphorylation of AKT and glycogen synthase kinase 3β in OECM‐1 cells. Blockage of phosphatidylinositol 3‐kinase (PI3K)/AKT signaling attenuated vimentin expression when it was induced by ANE. However, it did not affect ANE‐mediated extracellular signal‐regulated kinase (ERK) activation or cyclooxygenase 2 (COX‐2) upregulation. Oral carcinoma tissue samples were found to have significantly higher levels of vimentin and pAKT expression than their controls. Tumors exhibiting no vimentin expression and weak AKT phosphorylation were found to be associated with better survival than groups with high levels of expression. Conclusion: Our results imply that PI3K/AKT activation and vimentin expression are important pathogenic cascades in areca‐associated oral carcinogenesis.     

Glial fibrillary acidic protein and vimentin in the experimental glial reaction of the rat brain

Glial reaction has been studied in the rat by the immunohistochemical demonstration of glial fibrillary acidic protein (GFAP) and vimentin (VIM) in two experimental conditions. The first was represented by a necrotic cerebral lesion obtained by laser irradiation and the second by the development of experimental tumors induced by transplacental ethylnitrosourea. Reactive astrocytes develop not only in the proximity of the lesion but also distant from it. The intensity of the glial response seems to depend upon the normal distribution of astrocytes and the perilesional edema. GFAP decorates all the reactive astrocytes, whereas VIM is positive only in those at the edges of the lesion. The significance of the different responses in the two models and between the two intermediate filaments is discussed.