广西地区肝癌中c—myc和N—ras癌基因的原位表达？…

目的：分析了广西地区地癌中ｃ－ｍｙｃ、Ｎ－ｒａｓ癌基因的表达与乙型肝病毒（ＨＢＶ）感染的关系及其在肝癌发生中的作用。方法：应用原位ｃＤＮＡ－ＲＮＡ杂交方法和免疫组化方法检测３１例广西地区肝癌和相应癌旁组织中ｃ－ｍｙｃ ｍＲＮＡ、Ｎ－ｒａｓｍＲＮＡ和ＨＢｓＡｇ、ＨＢｘＡｇ。结果：肝癌及癌旁均有较高的ｃ－ｍｙｃ，Ｎ－ｒａｓ癌基因的表达。检出率都在８５％以上，其在不同发化程度肝癌中的表达差异无显著性意义     

v—sis和c—myc mRNA表达在脑膜瘤中的作用

本实验用原位杂交结合图像分析的方法对２８例脑膜瘤中ｖ－ｓｉｓ和ｃ－ｍｙｃ的ｍＲＮＡ表达状况进行了定位，定位，定量研究。结果表明：ｖ－ｓｉｓ和ｃ－ｍｙｃ ｍＲＮＡ在脑膜瘤中的高表达率分别为２８．６％和４６．４％，说明它们的表达增高在脑膜瘤中都有一定作用。相关分析发现，两种瘤基因的ｍＲＮＡ表达只在纤维细胞型脑膜瘤中呈正相关，说明ｖ－ｓｉｓ和ｃ－ｍｙｃ协同表达在ＦＭ中具有特异性作用，也说明各组织分型的脑     

骨肉瘤N—ras,c—myc基因异常及其蛋白产物的表达

目的：探讨癌基因Ｎ－ｒａｓ，ｃ－ｍｙｃ及其蛋白表达与骨肉瘤的关系，方法：Ｓｏｕｔｈｅｒｎｂｌｏｔ和免疫组织化学（ＬＳＡＢ法）同步检查９例人骨肉瘤Ｎ－ｒａｓ，ｃ－ｍｙｃ癌基因和其ｐ２１ｒａｓｃ－ｍｙｃ蛋白产物表达，结果：Ｎ－ｒａｓ基因１例有为失改变，检出率１１％（１／９），ｃ－ｍｙｃ基因有３例为扩增改变，检出率３３％（３／９），ｐ２１ｒａｓ，ｃ－ｍｙｃ基因蛋白表达阳性率分别为７８％（７例），８９％（     

实验性运动病大鼠脑细胞c—fos基因表达

目的：探讨运动病的发生机理。方法：取ＳＤ大鼠１６只分为２组，其中１组按Ｃｒａｍｐｔｏｎ的方法进行旋转刺激诱导运动病；而非旋转组作为对照。用原位杂交和免疫组化方法、图像分析技术对旋转刺激组大鼠及对照组大鼠大脑、脑干和小脑中ｃ－ｆｏｓｍＲＮＡ、Ｆｏｓ蛋白含量变化进行定位、定量研究。结果：旋转刺激后３种组织中ｃ－ｆｏｓｍＲＮＡ、Ｆｏｓ蛋白的含量均有显著增加。结论：推测应激反应基因ｃ－ｆｏｓ的表达参与运动病的发生和发展     

白细胞介素—1β及肿瘤坏死因子—α对脑损伤后胶质细胞c—fos…

本研究用分子杂交技术观察了白细胞介素－１β及肿瘤坏死因子－α对脑损伤后及培养的胶质细胞ｃ－ｆｏｓ ｍＲＮＡ表达的影响。结果发现：脑损伤后损伤周围组织ｃ－ｆｏｓ ｍＲＮＡ表达呈动态变化；１ｈ后增加１７０％，１２ｈ后增加３０％，２４ｈ后增加１３０％。发现白细胞介素－１β和肿瘤坏死因子－α能显著增加脑损伤后１２ｈ及２４ｈ ｃ－ｆｏｓ ｍＲＮＡ的表达；当培养的胶质细胞中加入此二者后１ｈ ｃ－ｆｏｓ ｍＲＮ     

人肝癌和癌旁组织c—myc基因扩增,转录和表达的研究

应用１４例配对的肝切除标本，系统性地探讨了肝癌和癌旁组织ｃ－ｍｙｃ基因扩增，ｍＲｎａ转和ｃ－ｍｙｃ基因产物表达水平的变化。肝癌和癌旁组织未见ｃ－ｍｙｃ基因扩增，原位杂交检测可见１１例癌组织，１００例癌旁组织ｍＲＮＡ转录水平增加。     

肝癌组织中ras,c—myc,c—erbB—2和p53的蛋白表达

目的：探讨肝癌的发病机理，方法：应用免疫组化ＳＰ法对４６例肝癌细胞组织及其３８列癌旁中癌基因ｒａｓ，ｃ－ｍｙｃ，ｃ－ｅｒｂＢ－２和抑癌基因ｐ５３基蛋白达作定位研究，结果：在癌组织中的检出率分别为５８．７％，６７．４％，４７．８％和２０．４％，癌旁组织中的检出率分别为３４．２％，４７．４％，４２．１％和７．９％，ｒａｓｐ２１蛋白位于肝细胞和肝细胞的胞浆内ｃ－ｅｒｂＢ－２蛋白位于肝细胞和肝癌细胞的胞浆     

胶质瘤bcd—2基因表达水平与其细胞增殖和凋亡关系的研究

目的 探讨胶质瘤细胞ｂｃｌ－２基因表达水平与肿瘤恶性程度、细胞增殖活性及凋亡程度的关系。方法 以６９例不同级别的人胶质瘤组织为研究对象,用原位杂交及免疫组化染色ＡＢＣ法分别检测ｂｃｌ－２ｍＲＮＡ、ｂｃｌ－２蛋白和增殖细胞核抗原（细胞增殖活性标记物）的表达,并用３’末标记法做原位细胞凋亡检测。结果 ６４例（９２．８％）表达ｂｃｌ－２ｍＲＮＡ,６０例（８７．０％）表达ｂｃｌ－２蛋白,两者的表达水平呈正     

表皮生长因子对大鼠血淋巴细胞c—fos基因表达的效应

本研究的目的是探讨表皮生长因子对大鼠血淋巴细胞转化率和ｃ－ｆｏｓ基因表达的效应。结果表明：大鼠血淋巴细胞呈免疫反应性，胞质内可见到ＥＧＦｍＲＮＡ信号；ＥＧＦ瓣育可显著提高大鼠血淋巴细胞的转化率和ｃ－ｆｏｓ基因表达水平，与对照组相比较，Ｐ＜０．００１，而与植物血凝素孵育组无显著性差异，Ｐ＞０．０５。     

食管癌中癌基因产物c—fos,c—jun的表达

探讨癌基因ｃ－ｆｏｓ，ｃ－ｊｕｎ表达产物与食管癌的发生，发展及预后的关系。方法：应用免疫组织化学ＳＡＢＣ法，以兔抗ｃ－ｆｏｓ，ｃ－ｊｕｎ抗体标记同６０例食管癌和１０例远端切缘粘膜。观察其在切缘食管粘膜，癌旁粘膜及不同分化程度和组织学类型食管癌的表达，并比较其阳性率。     

胶质瘤细胞血小板源生长因子B链的纯合二聚体与其受体基因？…

目的 探讨胶质瘤细胞血小板源生长因子Ｂ链的纯合二聚合（ＰＤＧＦＢＢ）及其受体（ＤＧＦＲ）基因表达和ＰＤＧＦＲ活化汪洋在胶质瘤发生、发展听作用。方法 用原位杂交和免疫组化染色观察了７３例不同级别的人胶质瘤组织标本。结果 ６２例（８４．９％）的肿瘤细胞表达ＰＤＧＦＢｍＲＮＡ,基阳性率和阳性肿瘤细胞含量均随肿瘤恶性程度升高而递增。ＰＤＧＦＲα、ＰＤＧＦＲβ和这两种受体及其信号传递通路活化标记物酪氨酸磷酸     

胶质瘤细胞血小板源生长因子B链的纯合二聚体自分泌环活性与肿瘤细胞增殖和凋亡的关系

目的探讨胶质瘤细胞血小板源生长因子Ｂ链的纯合二聚体（ＰＤＧＦＢＢ）自分泌环活性与其细胞增殖和凋亡的关系。方法用原位杂交、原位细胞凋亡检测和免疫组化ＡＢＣ法染色观察了７３例不同级别的胶质瘤组织。结果胶质瘤细胞ＰＤＧＦＢＢ自分泌环活性与其增殖活性呈显著性正相关，两者均随肿瘤恶性程度升高而增强。肿瘤细胞凋亡随肿瘤恶性程度升高而减少，并与肿瘤细胞ＰＤＧＦＢＢ自分泌环活性和增殖活性呈显著性负相关。结论以上指标对评价胶质瘤生物学行为均有参考价值。胶质瘤细胞ＰＤＧＦＢＢ自分泌环活性异常增加可能是刺激肿瘤细胞增殖和抑制其凋亡的重要因素，并在胶质瘤发生及恶性进展过程中起重要作用。     

胶质瘤细胞血小板源生长因子B链的纯合二聚体自分泌环活性？…

探讨胶质瘤细胞血小板源生长因子Ｂ链的纯合二聚体自体沁 活性与其细胞增殖和凋亡的关系。方法用原位杂交,原位细胞凋亡检测和免疫组化ＡＢＣ法染色观察了７３例不同级别的胶质瘤组织。     

骨髓间充质干细胞向胶质瘤迁移中血小板衍生生长因子BB的作用

目的探讨血小板衍生生长因子BB(PDGFBB)对大鼠骨髓间充质干细胞(BMSCs)定向迁移的影响及其在BMSCs向C6胶质瘤迁移过程中的作用。方法直接贴壁法分离培养传代BMSCs,RT-PCR检测PDGF受体α和β mRNA在BMSCs的表达,用Transwell小室建立体外迁移模型检测PDGFBB对BMSCs迁移的影响及其在BMSCs向C6胶质瘤的迁移过程中的作用,评价p38丝裂原蛋白激酶(p38MAPK)抑制剂SB203580对PDGFBB诱导BMSCs迁移能力改变的影响。结果通过直接贴壁法获得了纯化的BMSCs,RT-PCR证实PDGF受体α和βmRNA在BMSCs呈阳性表达,C6胶质瘤可以诱导BMSCs向胶质瘤细胞定向迁移。用阻断抗体阻断PDGFBB后,向C6胶质瘤发生迁移的BMSCs数量减少;含10ng/mlPDGFBB的无血清培养基可诱导BMSCs迁移;加入SB203580后PDGFBB诱导发生迁移的BMSCs数量减少。结论 PDGFBB是诱导BMSCs向C6胶质瘤发生迁移的细胞因子之一。PDGFBB可诱导BMSCs发生迁移,p38M APK参与了这一过程的信号转导。     

血小板衍生性生长因子对体外培养人肾小球系膜细胞生长的影响

目的观察血小板衍生性生长因子（ＰＤＧＦ）对体外培养的人肾小球系膜细胞（ＭｓＣ）生长、基质合成和分泌以及ｃ┐ｍｙｃ癌基因表达的影响。方法体外培养的ＭｓＣ培养液中掺入５┐溴脱氧尿嘧啶（ＢｒｄＵ）,采用ＢｒｄＵ单克隆抗体免疫组化法检测ＭｓＣ的增殖情况;应用［３Ｈ］脯氨酸掺入酶消化法测定ＭｓＣ细胞内、外胶原蛋白总量;采用Ｎｏｒｔｈｅｒｎ印迹法检测纤维连接蛋白（ＦＮ）、Ⅳ型胶原、核癌基因ｃ┐ｍｙｃｍＲＮＡ表达结果。结果（１）ＢｒｄＵ掺入法的阳性细胞标记指数在对照组为１９．５％,ＰＤＧＦ组为３４．５％（Ｐ＜０．０１）;（２）ＭｓＣ经ＰＤＧＦ作用后,细胞内、外胶原蛋白量分别为２．６９±０．６０％和３．８７±０．６５％,较正常对照组１．２５±０．５０％和１．６１±０．５１％明显增加（Ｐ＜０．０１）;（３））Ｎｏｒｔｈｅｒｎ印迹法显示ＰＤＧＦ组细胞的ＦＮ、Ⅳ型胶原及ｃ┐ｍｙｃｍＲＮＡ的表达明显高于正常组。结论ＰＤＧＦ不仅可刺激肾小球ＭｓＣ的增殖和胶原蛋白合成,而且可从基因转录水平增加ＦＮ、Ⅳ型胶原及ｃ┐ｍｙｃ癌基因的表达。由此推断ＰＤＧＦ在肾小球疾病的发生、发展中可能起着重要作用     

Density-dependent inhibition of cell growth by transforming growth factor-beta 1 in normal human fibroblasts

We report here that transforming growth factor-beta 1 (TGF-beta 1) inhibits platelet-derived growth factor (PDGF)-induced DNA synthesis in normal human fibroblasts in a cell density-dependent manner; no inhibition was seen in sparse cultures, approximately 50% inhibition in confluent cell cultures, and an almost total inhibition in dense cultures. The PDGF-inducible genes c-myc and c-fos were induced also by TGF-beta 1. Simultaneous addition of TGF-beta 1 and PDGF resulted in sustained, rather than transient, expression of c-fos mRNA; c-fos mRNA was detected as long as 24 hr after addition of PDGF and TFG-beta 1. TGF-beta 1 also induced mRNA for the A chain, but not the B chain, of PDGF. Conversely, PDGF induced TGF-beta 1 mRNA in sparse but not in dense cultures. These data indicate the existence of a complex interdependent regulation of PDGF and TGF-beta mRNA expression which is influenced by the cell density.     

胶质瘤细胞ING1、人端粒酶逆转录酶及人端粒酶相关蛋白1基因表达的研究

目的 探讨胶质瘤细胞ING1、人端粒酶逆转录酶(hTERT)和人端粒酶相关蛋白1(hTP1)基因表达的意义。方法 用mRNA原位杂交及免疫组织化学染色方法观察了70例不同级别的人胶质瘤组织。结果 hTERT mRNA和蛋白的阳性表达率分别为88.6％和82.9％,hTP1 mRNA和蛋白的阳性表达率均为100％,这4种阳性肿瘤细胞的密度彼此间均呈正相关(r=0.758～0.882,P<0.0005),并均随肿瘤级别升高而相应增加(P<0.05～0.01)。ING1 mRNA和蛋白的阳性表达率分别为94.3％和88 6％,两种阳性肿瘤细胞密度间也呈正相关(r=0.831,P<0.0005),但两者均随肿瘤级别升高而相应减少(P<0.01),并均分别与hTERT mRNA和蛋白及hTP1 mRNA和蛋白的阳性肿瘤细胞密度呈负相关(r=-0.211～-0.384,P<0.05～0.001)。结论 胶质瘤细胞中hTERT和hTP1基因表达异常增加可能是抑制其ING1基因表达的重要因素,这3种基因的表达异常可能在胶质瘤发生及恶性进展过程中起重要作用。     

Diffuse large B-cell lymphomas with germinal center B-cell-like differentiation immunophenotypic profile are associated with high apoptotic index, high expression of the proapoptotic proteins bax, bak and bid and low expression of the antiapoptotic protein bcl-xl.

The aim of this study was to analyze the relations between differentiation immunophenotypes and the status of apoptosis and proliferation in diffuse large B-cell lymphomas. Therefore, the bcl6/CD10/MUM1/CD138 differentiation immunophenotypic profiles were studied in relation to (a) the apoptotic index, (b) the apoptosis-associated bcl2 family proteins bcl2, bcl-xl, bax, bak, bad and bid, (c) the proliferation index (Ki67) and (d) the cell cycle proteins cyclin A, cyclin B1, cyclin D3, cyclin E, p53, Rb, p16 and p27 in 79 cases of diffuse large B-cell lymphomas. Two major differentiation immunophenotypic profiles were distinguished: the germinal center B-cell-like profile; 31 cases (bcl6+/CD10+/-/MUM1-/CD138-: 29 cases and bcl6-/CD10+/MUM1-/CD138-: two cases) and the nongerminal center B-cell-like profile (bcl6+/-/CD10-/MUM1+/CD138-); 48 cases. The expression of bax, bak and bid and the apoptotic index were significantly higher in the germinal center B-cell-like profile than in the nongerminal center B-cell-like profile (P=0.045, 0.018, 0.003 and 0.034, respectively). In contrast, the expression of bcl-xl was significantly lower in the germinal center B-cell-like profile than in the nongerminal center B-cell-like profile (P=0.026). The expression of bcl6 and CD10 showed significant positive correlation with the expression of bax (r=0.659, P<0.001 and r=0.240, P=0.033, respectively), bak (r=0.391, P<0.001 and r=0.233, P=0.039, respectively) and bid (r=0.652, P<0.001 and r=0.238, P=0.035, respectively) and significant negative correlation with the expression of bcl-xl (r=-0.536, P<0.001 and r=-0.250, P=0.029, respectively). The expression of MUM1 showed significant negative correlation with the expression of bax (r=-0.276, P=0.014) and bid (r=-0.266, P=0.018) and significant positive correlation with the expression of bcl-xl (r=0.238, P=0.037). The above findings indicate that diffuse large B-cell lymphomas with germinal center B-cell-like immunophenotypic profile are associated with increased apoptosis status, high expression of the proapoptotic proteins bax, bak and bid and low expression of the antiapoptotic protein bcl-xl.     

Evaluation of biological responses to polymeric biomaterials by RT-PCR analysis IV: study of c-myc, c-fos and p53 mRNA expression

In order to investigate how cells recognize biomaterials, mRNA that was expressed in attached human fibroblasts on various substrates was evaluated. The expressed oncogenes (c-fos and c-myc) and tumor suppressor gene (p53) mRNA were then isolated and detected using the RT-PCR method. As a result, c-fos and c-myc mRNA expression varied with respect to differences in the hydrophilicity-hydrophobicity of the substrates. Both c-fos and c-myc mRNA expression were low in the fibroblasts that had adhered to hydrophilic surfaces. The tendency of c-fos mRNA expression was similar to the adhesion curve of the cells. c-myc mRNA was largely induced in fibroblasts that had adhered to hydrophobic surfaces. p53 mRNA were largely induced in fibroblasts that had adhered to hydrophilic surfaces, while in the cells that had adhered to hydrophobic surfaces, p53 mRNA expression was low. We concluded that the expression of oncogenes and p53 mRNA is a powerful method for studying cell-polymer interactions or the evaluation of the carcinogenic activity of biomaterials.