层粘连蛋白和纤维粘连蛋白在正常绒毛膜组织中的表达

层粘连蛋白和纤维粘连蛋白是细胞外基质的重要成分 ,在正常组织中有广泛分布。目前认为层粘连蛋白有 10条不同源的多肽链 ,构成 11种不同的蛋白分子。纤维粘连蛋白的结构具有多形性 ,主要由 ED-A、ED- B、 CS三个结构区不同的拼接方式所决定。层粘连蛋白和纤维粘连蛋白不仅在支持、连接和维持组织形态 ,调节细胞的粘附、生长、分化、增殖等方面起重要作用 ,而且与胚泡着床及胎盘的形成也有密切关系     

层粘连蛋白和纤维粘连蛋白在正常绒毛膜葡萄胎,绒毛膜癌组织中？…

目的：探讨层粘连蛋白和纤维粘连蛋白在正常绒毛膜和滋养细胞肿瘤中的作用。方法：用免疫组织化学方法观察层粘连蛋白和纤维连蛋白在正常绒毛膜、葡萄胎和绒毛膜癌组织中的表达。结果：在正常绒毛膜组织中,二种蛋白有广泛表达,如绒毛上皮基膜、毛细血管内皮基膜、绒毛间质、滋养细胞柱和蜕膜。在葡萄胎,层粘连蛋白分布于绒毛上皮基膜和蜕膜组织,在基膜中表达强度有所不同;纤维粘连蛋白分布于绒毛和蜕膜内,呈弱阳性表达,在侵蚀     

层粘连蛋白和纤维粘连蛋白在着床期小鼠子宫内膜中的表达

目的：为探讨层粘连蛋白和纤维粘连蛋白在胚泡着床过程中的生物学作用。方法：本实验使用昆明雌性小鼠30只,分为未孕和早期妊娠共6组。通过免疫组织化学方法,检测了层粘连蛋白和纤维粘连蛋白在着床期小鼠子宫内膜中的分布状况。结果：胚泡着床开始时（即受精后4－5天）,层粘连蛋白和纤维粘连蛋白均出现一个表达高峰,尔后纤维粘连蛋白迅速减少。受精后6－8天,细胞外基质中的层粘连蛋白逐渐增加。结论：层粘连蛋白和纤维粘连蛋白在胚泡着床微环境和植入调节中发挥重要作用。     

纤维粘连蛋白和层粘连蛋白对培养血管平滑肌细胞生长和分裂的影响

我们用不同剂量的纤维粘连蛋白（Ｆｉｂｒｏｎｅｃｔｉｎ，Ｆｎ）和层粘连蛋白（Ｌａｍｉｎｉｎ，Ｌｎ）作用于培养的血管平滑肌细胞（ＶＳＭＣｓ）观察ＶＳＭＣｓ的生长和分裂情况，发现Ｆｎ和Ｌｎ均能促进ＶＳＭＣＳ的生长和分裂，Ｆｎ的这种作用在４０μｇ以下呈剂量依赖性，Ｌｎ则在２４μｇ以下呈剂量依赖性，当细胞数达到最大后，Ｆｎ和Ｌｎ的促进作用均逐步减弱。     

上皮细胞膜抗原和层粘连蛋白在大肠癌中的表达

上皮细胞膜抗原和层粘连蛋白在大肠癌中的表达冯树宋今丹上皮细胞膜抗原（ＥＭＡ）已作为一种肿瘤标志物用于肿瘤的研究中。层粘连蛋白（ＬＮ）是基底膜的主要成分，对细胞的增殖、生长、分化及癌细胞的浸润和转移等方面均起着重要的调节作用〔１〕。用免疫组化法对６３例...     

层粘连蛋白和纤维粘连蛋白在过量维生素A酸致心脏畸形中的作用： …

维生素Ａ酸是常见的一类化学致畸因子，可引起各种心脏畸形，如主动脉骑跨，室间隔缺损等，实验采用免疫组织化学方法观察层粘连蛋白和纤维连蛋白在心脏正常和异常发育过程 的分布和变化规律，以探讨过量维生素Ａ酸致心脏畸形发生的机理。结果显示：心内膜垫形成之前，心内膜细胞基底面呈层粘连蛋白和纤维粘连蛋白阳性，当内膜细胞转化为内膜垫细胞时，其基底面的粘连蛋白和纤维粘连蛋白消失，心胶质和心肌膜中层粘连蛋白，纤维粘连     

层粘连蛋白、纤维粘连蛋白和整合素β3在着床前小鼠早胚发育中的表达

目的 :探讨层粘连蛋白 (Laminin ,LN)、纤维粘连蛋白 (Fibronectin ,FN)和整合素 β3 (Integrinβ3)在着床前早胚发育中的生物学作用。方法 :获取着床前不同发育时期的小鼠早胚 ,用免疫组织化学方法 ,分别检测LN、FN和整合素 β3在早胚发育中的表达状况。结果 :LN、FN和整合素 β3广泛分布于 2细胞期至胚泡期胚的细胞表面。结论 :LN、FN和整合素 β3在小鼠早胚发育的调节中发挥重要作用     

纤维粘连蛋白和层粘连蛋白与子宫内膜异位症发病关系的研究

目的探讨纤维粘连蛋白（Fibronectin,FN）和层粘连蛋白（Laminin,LN）与子宫内膜异位症的关系。方法采用免疫组化方法分析了子宫内膜异位症患者异位内膜35例、在位内膜20例及对照组子宫内膜24例的FN和LN的表达变化。结果1.与对照组相比子宫内膜异位症异位内膜组FN、LN的表达均明显下降,差异有显著性（均为P〈0.05）;2.在位内膜组FN、LN的表达同样也呈明显下降,有显著性差异（FN,P〈0.01;LN,P〈0.05）。提示细胞外基质中FN、LN的表达减少与子宫内膜异位症的发生、发展有关。     

宫腔注射纤连蛋白抗体和层粘蛋白抗体对小鼠胚泡着床的影响

目的：主要研究纤连蛋白抗体和层粘连蛋白抗体对胚泡着床的影响,方法：取孕４天小鼠,分别在两侧子宫角内注射纤连蛋白及层粘连蛋白抗血清,于孕８天检查胚胎床数,取子宫观察内膜的组织学及免疫组织化学变化。结果：纤维蛋白抗血清及层粘连蛋白抗血清均有显著抑制胚泡着床的效应,组织学及免疫组化结果表明,纤连蛋白抗血清及层粘连蛋白抗血清可引起蜕膜细胞退化解体,拮抗纤维蛋白及层粘连蛋白在脱膜组织中的表达,结论：纤连蛋白     

TENASCIN AND FIBRONECTIN EXPRESSION IN HEALING HUMAN MYOCARDIAL SCARS

Fibronectin and tenascin are matrix proteins known to be present in early experimental wound healing. As only limited data are available regarding early matrix changes in human myocardial infarction, the presence of tenascin and fibronectin was studied in human myocardial infarctions of different post-infarction times (6 h to 17 years), using immunohistochemistry. In normal myocardium, fibronectin immunostaining was found in the subendothelial space in vessels. Tenascin was not present in normal myocardium. While fibronectin was demonstrated in the ischaemic cardiomyocytes within 1 day, tenascin was found 4–6 days post-infarction and was located at the margin of the area of infarction. Tenascin expression then shifted from the margin to the centre of the area of infarction, where it could be found 2–3 weeks post-infarction. More than 4 weeks post-infarction, the scar tissue consisted of collagen fibres, with sparse (myo)fibroblasts. By that time, both tenascin and fibronectin expression had disappeared. Another interesting observation in this study was the presence of tenascin, but not fibronectin, surrounding vacuolated glycogen-rich cells, or so-called hibernating cardiomyocytes.     

层粘连蛋白和纤维粘连蛋白在过量维生素A酸致心脏畸形中的作用:免疫组织化学研究

维生素A酸是常见的一类化学致畸因子,可引起各种心脏畸形,如主动脉骑跨、室间隔缺损等.实验采用免疫组织化学方法观察层粘连蛋白和纤维粘连蛋白在心脏正常和异常发育过程中的分布和变化规律,以探讨过量维生素A酸致心脏畸形发生的机理.结果显示:心内膜垫形成之前,心内膜细胞基底面呈层粘连蛋白和纤维粘连蛋白阳性;当内膜细胞转化为内膜垫细胞时,其基底面的层粘连蛋白和纤维粘连蛋白消失,心胶质和心肌膜中层粘连蛋白、纤维粘连蛋白免疫组化染色明显增强;心内膜垫形成并融合后,其染色又明显减弱.给孕鼠灌服过量的维生素A酸18小时后,各时间组胚胎心脏的心内膜、心胶质、心肌膜的层粘连蛋白和纤维粘连蛋白均出现了不同程度的减弱.这说明层粘连蛋白和纤维粘连蛋白是内膜垫细胞粘着和迁移的主要介导物质,维生素A酸抑制其两者的合成是引起心脏畸形的一个重要途径.     

肝再生过程中肝和脑垂体纤维粘连蛋白表达的变化

目的；探讨大鼠肝大部分切除再生过程中肝和垂体内纤维粘连蛋白变化变化，方法：用免疫组织化学法观察鼠肝大部切除术０．５天，１天，１．５天，２天，３天，７天时，肝内和垂体远侧部滤泡状细胞细胞纤维粘连蛋白的变化，并用图像分析仪进行定量测定，结果：肝大部切除术后１．５天，肝内纤维粘连蛋白阳性染色增强，基平均光密度高于对照组（Ｐ〈０．０５）；术后２～３天，镜下可见纤维粘连蛋白染色呈强阳性，尤其在肝组织增生部位     

THE SPECTRUM OF 67-kD LAMININ RECEPTOR EXPRESSION IN BREAST CARCINOMA PROGRESSION

Laminin is a glycoprotein of the basement membrane (BM), involved in a variety of normal and pathological cellular events including tumour invasion and metastasis. Cells bind laminin through different types of receptor. The 67-kD laminin receptor (67LR) is a cell-surface protein which binds laminin with high affinity. 67LR expression has been shown to increase in neoplastic cells, compared with normal tissues, and 67LR seems to play an important role during the first steps of neoplastic progression. In this study, 67LR expression was analysed during the morphological phases of breast cancer progression from normal tissue to invasive carcinoma. A total of 506 formalin-fixed, paraffin-embedded normal breast structures and lesions were stained by immunohistochemistry using the MLuC5 monoclonal antibody, which is specific for 67LR. The results show that in normal breast and in any kind of breast lesion, myoepithelial and endothelial cells express 67LR. While 67LR is not seen in the epithelium of normal breast, cysts, adenosis, and benign tumours, it is expressed in the epithelial cells of several hyperplasias and carcinomas in situ, both ductal and lobular, as well as in all invasive carcinomas. The 67LR-positive cell subpopulation expands from hyperplastic lesions to invasive carcinoma, suggesting that 67LR could be related to the induction and progression of breast cancer. © 1997 John Wiley & Sons, Ltd.     

EXPRESSION OF THE LAMININ γ2 CHAIN IN PANCREATIC ADENOCARCINOMA

Forty-two pancreatic adenocarcinomas were investigated immunohistochemically and by in situ hybridization for the expression of the laminin γ 2 chain. In 41 cases, intracytoplasmic immunoreactivity for the γ2 chain was seen. Positive tumour cells were located especially at the epithelial–stromal interface of the tumour cell islands. In 22 cases, diffuse laminin γ2 chain immunoreactivity could also be seen in stroma and in seven cases, occasional positivity was detected in the neoplastic basement membranes. Signals for laminin γ2 chain mRNA in tumour cells displayed a distribution similar to that observed on immunohistochemistry. There were significantly more cases with less than 20 per cent of laminin γ2 chain-positive tumour cells in tumours extending to peripancreatic tissues and/or tumours with regional or distant metastases ( P =0·029). A corresponding statistical significance could also be noted in the mRNA level ( P =0·025). The results show that pancreatic adenocarcinomas display a high activity of laminin γ 2 chain synthesis. Tumours with a strong laminin γ2 chain synthesis show a lower invasive and metastatic potential than tumours with a weak or moderate laminin γ2 chain expression.     

APC EXPRESSION IN NORMAL HUMAN TISSUES

The tumour suppressor gene APC codes for a 2843-amino acid protein whose precise functions are still poorly understood. This paper describes the development of two new antisera to APC (to amino- and carboxy-terminal epitopes) which permit localization of the protein by immunohistochemistry in archival paraffin sections. The protein is expressed in a wide variety of normal epithelial tissues. Its distribution frequently coincides with the location of post-replicative cells within tissues. Staining patterns demonstrate that the APC protein, although often diffusely cytoplasmic in distribution, may also accumulate in the apical and immediately subapical regions, or along the lateral margins of certain cells. These results indicate that APC is significant in many tissues in addition to the colorectal epithelium. They are compatible with a function related to signalling at the adherens junction and possibly with other more complex roles in cells committed to terminal differentiation. © 1997 by John Wiley & Sons, Ltd.     

OVEREXPRESSION OF THE 67-kD LAMININ RECEPTOR CORRELATES WITH TUMOUR PROGRESSION IN HUMAN COLORECTAL CARCINOMA

The high affinity 67-kD laminin receptor (67LR) is a cell surface protein whose expression is increased in a number of human carcinoma models. To date, 67LR expression in colorectal carcinomas has been examined in a small number of cases. 67LR expression has been immunohistochemically analysed in a large series of human colorectal neoplasms, using the MLuC5 monoclonal antibody. The study included 59 samples of non-neoplastic mucosa, 45 polyps (11 hyperplastic, 34 adenomas), 196 carcinomas, and lymph node metastases of 87 carcinomas. Epithelial cells of normal mucosa and hyperplastic polyps were negative or showed weak positivity in the paranuclear and apical areas of the cytoplasm. In adenomas and carcinomas, the staining was stronger, with a membranous or cytoplasmic pattern. The expression of 67LR correlated significantly with the progression from normal mucosa (22 per cent) to adenoma (44 per cent), carcinoma (61 per cent), and lymph node metastasis (75 per cent) ( P <0·0001). Expression of the laminin receptor showed a tendency to be more frequently positive in advanced stage (III+IV; 67 per cent) when compared with early stage (I+II) carcinomas (54 per cent). The difference, however, was not statistically significant ( P =0·058). In addition, 14 out of 28 (50 per cent) primary carcinomas without 67LR expression became positive in lymph node metastases, while most (86 per cent) of the MLuC5-positive primary carcinomas were also immunoreactive in metastases. In conclusion, these results indicate that 67LR is up-regulated in the progression of human colorectal carcinomas and may play a role in the local and metastatic progression of these tumours.