Bcl-2 和p53 蛋白表达对肝硬变和肝细胞癌中细胞增殖和凋亡的调节

利用原位 Ｄ Ｎ Ａ 末端转移酶标记技术及 Ｓ Ｐ 免疫组织化学方法检测了肝硬变和肝细胞癌（ Ｈ Ｃ Ｃ）组织中凋亡细胞,ｐ５３ , ｂｃｌ２ 蛋白和 Ｐ Ｃ Ｎ Ａ 的表达。结果显示： Ｈ Ｃ Ｃ 与肝硬变组织比较,凋亡细胞密度低, Ｐ Ｃ Ｎ Ａ 阳性细胞密度高,ｐ５３ 和 ｂｃｌ２ 蛋白阳性强度高,且均与 Ｈ Ｃ Ｃ 分化程度有关。提示ｐ５３ 和 ｂｃｌ２ 蛋白可能是通过其过度表达影响细胞增殖和细胞凋亡失衡,并以“选择性细胞增殖”形式导致 Ｈ Ｃ Ｃ 的发生和发展。     

双歧杆菌对实验性大肠癌的预防及诱导细胞凋亡的作用

目的　探讨青春型双歧杆菌对实验性大肠癌的预防作用及其防瘤机制。方法　以裸鼠大肠癌移植瘤为动物模型,预先用双歧杆菌注射于裸鼠腹腔,观察移植瘤的生长速度,同时利用透射电镜、原位末端标记技术及免疫组化技术观察大肠癌裸鼠移植瘤的超微结构、凋亡细胞密度以及ｂｃｌ２、ｂａｘ 蛋白表达率及其阳性细胞密度。结果　双歧杆菌预防组大肠癌移植瘤的生长速度显著慢于对照组; 此外双歧杆菌预防组移植瘤组织中可见多量处于不同凋亡时期的瘤细胞,其凋亡细胞密度、ｂａｘ 蛋白表达率以及阳性细胞密度均显著高于肿瘤对照组,而ｂｃｌ２ 蛋白的表达情况则相反。结论　青春型双歧杆菌能显著预防大肠癌的发生与发展,并能诱导其细胞凋亡。     

氯化甲基汞对大鼠脑神经细胞凋亡及P^53基因表达的影响

选用Ｗｉｓｔａｒ系雄性大鼠,经皮下注射给予１０ｍｇ／Ｋｇ体重氯化甲基汞（ＣＨ３ＨｇＣｌ）,连续７天,第１５天取其脑组织,利用细胞和分子生物学技术进行ＤＮＡ电泳和流式细胞术（ＦＣＭ）分析。实验结果,染毒组大鼠脑组织ＤＮＡ电泳呈现特征性梯形电泳带;ＦＣＭ分析染毒组大鼠脑神经细胞的凋亡率、Ｐ５３基因表达率显著高于对照组（Ｐ＜０．０５）。结果表明：ＣＨ３ＨｇＣｌ以诱导凋亡方式导致脑神经细胞损伤,Ｐ５３基因参与ＣＨ３ＨｇＣｌ诱导脑神经细胞凋亡的基因调控过程。     

8—Br—cAMP对人视网膜母细胞瘤HXO—Rb44细胞癌基因的表达效应

目的 研究８－Ｂｒ－ｃＡＭＰ对培养的人视网膜母细胞瘤ＨＸＯ－Ｒｂ４４细胞癌基因表达的效应及其与该细胞生长的关系。方法 ｃ－ｆｏｓ ｍＲＮＡ,Ｎ－ｍｙｃ ｍＲＮＡ及ｐ２１ｒａｓ ｍＲＮＡ均以原位杂交ＲＮＡ斑点印迹技术检测,对繁殖细胞核抗原,ｖ－Ｆｏｓ,Ｎ－Ｍｙｃ和Ｐ＾２１ｒａｓ蛋白表达的免疫反应性则采用免疫组化及收白质斑点印迹技术检测。     

MADP-1基因对前列腺癌细胞系DU145体外生长的影响

[目的]探讨新基因MADP-1对雄激素非依赖性前列腺癌细胞系DU145增殖的影响,了解其功能.[方法]采用脂质体和绿色荧光蛋白基因标记的质粒载体pIRES-hrGFP-1α,将MADP-1基因导入前列腺癌细胞系DU145中.应用荧光显微镜、流式细胞仪分析和分选术及细胞生长曲线动态观察MADP-1基因对DU145细胞系的影响.[结果]转染细胞在荧光显微镜下显示绿色荧光.转染MADP-1基因组细胞生长加速,与转染空载体组及对照组相比,有显著差异(P＜0.05).[结论]新基因MADP-1在体外具有促进前列腺癌细胞系DU145增殖的作用.     

转化生长因子-α和myc癌基因蛋白在卵泡发育与黄体形成及退化中的表达

目的：探讨转化生长因子（ＴＧＦ）－α和ｍｙｃ癌基因蛋白（ｍｙｃ蛋白）对人卵巢卵泡发育的局部调控机理。方法：收集３６例月经规则、因不同妇科情况切除的子宫及卵巢标本，采用免疫组织化学方法，研究ＴＧＦ－α和ｍｙｃ蛋白在卵巢组织中的表达。结果：卵母细胞在始基卵泡阶段，ＴＧＦ－α和ｍｙｃ蛋白的表达呈强阳性，随着卵泡的发育与成熟表达逐渐减弱。在颗粒细胞中，ＴＧＦ－α和ｍｙｃ蛋白表达均出现在窦前卵泡阶段，随卵泡的增大与成熟，ＴＧＦ－α表达逐渐增强。闭锁卵泡中ＴＧＦ－α和ｍｙｃ蛋白表达仅限于卵泡膜细胞。在晚期退化的黄体中，ＴＧＦ－α和ｍｙｃ蛋白表达均局限于黄体中央瘢痕周围的黄体膜细胞。结论：ＴＧＦ－α和ｍｙｃ蛋白作为卵巢内局部的调节因子，通过自分泌和旁分泌途径，协同参与人卵母细胞最初的生长、卵泡细胞的增殖分化和黄体细胞凋亡的过程。     

Ras oncogene-transformed and nontransformed cell populations are each heterogeneous but respond differently to the chemotherapeutic drug cytosine arabinoside (Ara-C)

 In order to determine whether the growth of ras oncogene-transformed cells and nontransformed cells was inhibited differently by the chemotherapuetic drug cytosine arabinoside (Ara-C) their growth was analyzed by a novel colony-based assay that is sensitive and appropriate for heterogeneous cell populations. Colonies of nontransformed NIH3T3 cells, or ras onco- gene-transformed NIH(ras) cells, were grown in the absence of drug and then divided into subclones. Subclones were allowed to continue to grow in the absence or presence of drug. Growth inhibition was determined by comparing the growth of drug-treated subclones with the growth of related untreated subclones. Colonies of nontransformed cells grown in the absence of the drug displayed a large variation in growth, and when grown in the presence of the drug displayed a large variation in growth inhibition. Colonies of transformed cells also displayed a large variation in the absence and presence of the drug. For each cell line, related subclones were more similar to each other than to unrelated subclones, implying inheritance of growth rates and drug response. For NIH3T3 cells, the growth of subclones in the presence of drug was highly correlated with the growth of related subclones in the absence of drug. However, for NIH3T3(ras) cells the growth of subclones in the presence of drug was not correlated with the growth of related subclones in the absence of drug. Therefore, ras oncogene-transformed and nontransformed cell populations differ in their response to Ara-C. Received: 3 November 1995/Accepted: 30 July 1996     

乳腺肿瘤组织Ha-ras基因蛋白表达与血清CA15-3水平的相关性及其临床价值

用免疫组化ＡＢＣ法和ＩＲＭＡ法分别检测了４２例乳腺癌和３０例良性乳腺病变患者组织中Ｈａ－ｒａｓ基因蛋白（ｒａｓＰ２１）的表达状况及血清ＣＡ１５－３值，结果恶性病变组织中ｒａｓＰ２１呈过度表达，ｒａｓＰ２１的表达与细胞的分化状态密切相关。不同淋巴结转移状况的乳腺癌患者，其血清ＣＡ１５－３差异呈显著性。ＣＡ１５－３水平的变化与ｒａｓＰ２１表达状况显著相关。提示血清ＣＡ１５－３水平为监测乳腺癌病情变化的良好指标，Ｈａ－ｒａｓ癌基因点突变的结果可能导致乳腺癌相关抗原的异常分泌。     

No association between immunohistochemical expression of p53, c-erbB-2, Ki-67, estrogen and progesterone receptors in female papillary thyroid cancer and ionizing radiation

An association has previously been reported between exposure to medical diagnostic ionizing radiation and papillary thyroid cancer in women. To further evaluate potential mechanisms in carcinogenesis, the expression of p53, c-erbB-2, as well as Ki-67, estrogen and progesterone receptors were analyzed by immunohistochemistry in 19 women exposed to X-rays and for comparison in nine women without such reported exposure. They all had papillary thyroid cancer. No difference was found between these groups. The results of this study showed that p53, c-erbB-2, Ki-67, estrogen and progesterone receptors are not involved in papillary thyroid cancer associated with exposure to medical diagnostic ionizing radiation.     

砒石对哮喘小鼠气道壁厚度及c-myc与c-sis表达的影响

气道重构是哮喘的主要病理特征之一,平滑肌细胞(SMC)、成纤维细胞(FB)是气道粘膜下的主要结构细胞,具有合成和降解细胞外基质(ECM)的双重功能,其大量增殖引起ECM大量沉积,是引起基底膜增厚、导致气道重构的关键因素.近年来研究发现,c-myc 、 c-sis与SMC、FB增殖密切相关,三氧化二砷能抑制哮喘豚鼠的气道炎症.本研究通过建立小鼠哮喘模型,探讨c-myc、c-sis在哮喘气道重构中的作用及砒石对它们的影响,进一步探讨砒石治疗哮喘的可能机制,为哮喘的防治开辟新途径提供理论依据.