maspin在子宫颈癌中的研究进展

肿瘤发生和转移是一个多步骤、多途径、多基因表达的复杂过程。maspin基因是1994年ZouZ等对正常乳腺组织和乳腺癌组织进行比较时发现的候选肿瘤抑制基因,证实其为丝氨酸蛋白酶抑制基因,命名为maspin（mammary serine inhibitor）。maspin作为一种独特的丝氨酸蛋白酶抑制剂（serine protease inhibitor,serpin）,具有多种不同的生物学功能。     

Maspin基因在肿瘤中的研究进展

 Maspin是一种肿瘤抑制基因,属于丝氨酸蛋白酶抑制剂超家族成员,近年研究发现其通过抑制肿瘤血管生成,增加细胞黏附性,促进肿瘤细胞的凋亡,抑制肿瘤的发生和发展,并具有肿瘤转移抑制作用,有可能为基因治疗提供一条新途径。     

Protein expression profiling identifies maspin and stathmin as potential biomarkers of adenoid cystic carcinoma of the salivary glands

Adenoid cystic carcinoma (ACC) is one of the most common malignant tumors of the salivary glands. It tends to grow slowly but is associated with a poor prognosis compared to other malignant salivary gland tumors. To identify specific markers of ACC, we examined protein expression profiling in ACC xenograft and normal salivary glands (NSG) using fluorescent 2-dimensional differential in-gel electrophoresis (2-D-DIGE), an emerging technique for comparative proteomics, that improves the reproducibility and reliability of differential protein expression analysis between the samples. To identify the proteins, matrix-assisted laser desorption/ionization time-of-flight peptide mass fingerprinting was carried out. Using these strategies, we detected 4 upregulated proteins and 5 downregulated proteins in ACC xenograft. Maspin and stathmin were selected for further analyses. Western blotting and immunohistochemical staining showed a higher expression of these proteins in ACC xenograft and clinical ACC tissue compared to NSG. Furthermore, Expression of these proteins was correlated with the histologic grading of ACC (n = 10). Therefore, our data indicate that maspin and stathmin may be not only useful biomarkers of ACC but also markers of biologic behavior in this tumor.     

食管鳞癌组织中肿瘤抑制基因maspin表达的初步研究

目的 :探讨食管鳞癌组织中新肿瘤抑制基因maspin的变化。方法 :采用免疫组化ABC方法测定食管癌高发区食管癌组织中肿瘤抑制基因maspin蛋白的表达状况。结果 :食管癌组织中maspin免疫阳性表达率为 10 % ( 3/ 30 ) ,免疫阳性反应主要位于癌组织的细胞浆中。结论 :肿瘤抑制基因maspin可能在食管癌变过程中起一定作用     

乳腺癌组织中Maspin蛋白表达与maspin基因启动子甲基化关系的研究

背量与目的:探讨乳腺癌与maspin基因失活之间的关系.材料与方法:采用免疫组织化学方法检测30例乳腺癌患者癌组织、癌近旁组织和癌远旁组织中Maspin蛋白的表达情况,用亚硫酸氢钠测序法检测乳腺癌组织maspin启动子CpG岛的甲基化情况.结果:乳腺癌组织中的Maspin蛋白表达明显低于癌近旁组织(P<0.05)和癌远旁组织(P<0.01),乳腺癌组织maspin基因启动子CpG岛甲基化率为98.72%.结论:乳腺癌的发生与nmspin基因失活关系密切,启动子异常甲基化可能是maspin基因在乳腺癌中失活的重要途径.     

EXPRESSION OF MASPIN AND KAI1 AND THEIR CLINICOPATHOLOGICAL SIGNIFICANCE IN CARCINOGENESIS AND PROGRESSION OF GASTRIC CANCER

Objective To investigate the roles of maspin and kail expression in tumorigenesis and progression of gastric cancer.Methods Maspin and kail expressions were detected in normal gastric mucosa (n = 182), gastric dysplasia (n = 69), and gastric cancer (n = 113) by immunohisto-chemistry. Their expressions were compared with clinicopathological parameters of tumors. Relationship between maspin and kai1 expression was also concerned in gastric cancer.Results The positive rates ofmaspin expression were 79.8% (145/182), 75.4% (52/69), and 50.4% (57/113) in normal gastric mucosa, gastric dysplasia, and gastric cancer, while those of kail expression were 81.9% (149/182), 65.2% (49/69),and 58.4% (66/113) in corresponding tissues respectively. Gastric cancer less frequently expressed maspin than the normal gastric mucosa and gastric dysplasia (P ＜ 0.05), while dysplasia and cancer showed less frequent expression of kail than normal mucosa (P ＜ 0.05). Maspin expression showed negative association with invasive depth, metastasis, Lauren's and histological classifications (P ＜ 0.05), but not with tumor size, Borrmann's classification, growth pattern or TNM staging (P ＞ 0.05). Kail expression was negatively correlated with invasive depth, metastasis, growth pattern, Lauren's and histological classifications (P ＜ 0.05), but not with tumor size, Borrmann's classification or TNM staging (P ＞ 0.05). Maspin and kail were collaboratively expressed in gastric cancer (P ＜ 0.05).Conclusions Down-regulated expressions of maspin and kail play an important role in gastric carcinogenesis. Abnormal expression of maspin and kail might have inhibitory effects on invasion and metastasis of gastric cancer and act as an effective and objective marker to indicate the pathobiological behaviors of gastric cancer.     

Maspin increases extracellular plasminogen activator activity associated with corneal fibroblasts and myofibroblasts

Maspin, an inhibitor of cell migration and a stimulator of adhesion of cells to the ECM, is synthesized and released by corneal keratocytes into the extracellular matrix. When the cornea is wounded, the quiescent stromal keratocytes underlying the wound undergo apoptosis and cells adjacent to this apoptotic area convert to fibroblasts or myofibroblasts. This study explores the effect of extracellular maspin on the plasminogen–plasminogen activator system of corneal stromal cells following wounding. Treatment of corneal fibroblasts and myofibroblasts with r-maspin increased extracellular but not cell-associated tissue-type plasminogen activator (tPA), urinary-type plasminogen activator (uPA) or plasminogen activator inhibitor-1 (PAI-1). Despite the extracellular increase in PAI-1, the net effect of maspin treatment was an increase in plasminogen activation. At physiological levels, maspin did not alter uPA or tPA mRNA levels, in these cells. The increase in pro and active uPA was due to decreased clearance in the presence of maspin for myofibroblasts but not for fibroblasts. The clearance of pro and active tPA was normal in fibroblasts indicating different mechanisms for the increase of these homologous enzymes in the two cell types. Increased generation of plasmin by maspin treated corneal stromal fibroblasts and myofibroblasts led to conversion of plasminogen to active plasmin degradation products and angiostatin-like molecules. This study suggests that extracellular maspin increased pro and active uPA and tPA released by corneal fibroblasts and myofibroblasts on the short time scale of 1–4 h, but by 24 h there was no increase over the levels produced without maspin. This augmentation of plasminogen activator activity increases plasmin activation and angiostatin generation. It further indicates that the effect of maspin on uPA and tPA levels is cell type dependent.     

肝癌组织中maspin mRNA和蛋白的表达及意义

目的探讨肝癌组织中maspin基因在mRNA和蛋白水平的表达及意义。方法应用逆转录聚合酶链反应(RT-PCR)和免疫组织化学(IHC)法检测maspin在人正常肝脏、肝硬化和肝癌组织中的表达。结果maspin在人正常肝脏、肝硬化和肝癌组织中mRNA阳性表达率分别为88.9%(16/18)、57.1%(8/14)和41.7%(15/36),蛋白阳性表达率分别为83.3%(15/18)、50%(7/14)和38.9%(14/36),三组间相比差异均有统计学意义。maspin蛋白表达与肝癌的组织分化程度和远处转移有关(P均0.05),而与肿瘤大小无关(P0.05)。结论maspin在肝癌组织中呈低表达,maspin基因的缺失可能是肝癌发生、发展和转移的原因之一。     

抑癌基因maspin与消化道肿瘤研究进展

maspin是一种肿瘤抑制基因,编码产物属丝氨酸蛋白酶抑制剂超家族,卵清蛋白亚族.众多研究表明,maspin具有抑制肿瘤细胞运动、侵袭、转移和肿瘤新生血管生成等作用,在抑制肿瘤生长、转移中发挥重要功能.