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雌激素受体α和β是一类转录因子,产生多种生理功能,雌激素受体α和β调控靶基因转录是配体依赖性的,然而,近来研究表明雌激素受体α还存在另外一条信号途径,也称作非基因组或膜启动途径,能够快速地被雌激素激活,这种雌激素受体α位于细胞膜,因此也称作膜雌激素受体α,已经报道膜雌激素受体α与多种肿瘤的发生相关,本文阐述了近年来雌激素受体α的研究成果以及与乳腺癌的相关性. 相似文献
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<正>乳腺癌发病年龄日趋年轻化,发病率也逐年上升[1],预计到2030年,世界范围内乳腺癌的发病和死亡人数将分别达到264万和170万,在这些癌症新病例中,预计大多数将发生在发展中国家,尤其是印度和中国[2]。乳腺癌是激素依赖性肿瘤,雌激素信号传导通路在乳腺癌的发生发展过程中起着重要的作用[3]。雌激素受体(estrogen receptor,ER)表达阳性的 相似文献
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目的 探讨乳腺癌组织中雌激素受体α(ER α)的异质性表达与多种缺氧标志的关系。方法 5 1例经配体结合法证实ER阳性的乳腺癌患者 ,采用免疫组织化学染色的方法观察其ER α的异质性表达与多种缺氧标志的关系 ,同时观察体外缺氧环境对乳腺癌细胞系ER α表达的影响及其特异性。结果 4 9例乳腺癌为ER α阳性。无论乳腺导管内癌 (2 9例 )还是浸润性癌 (2 0例 ) ,ER α蛋白在邻近坏死灶的区域均下调 (P值分别≤ 0 .0 0 0 1) ;ER α的区域性下调还与缺氧诱导基因CA IX和Glut 1的表达有关 (P <0 .0 0 0 1)。缺氧可以直接诱导乳腺癌细胞系ER α蛋白和mRNA水平的下降 ,但其他一些应激因素 ,如低pH值、低糖及缺氧细胞的培养液等却无此作用。长时间、间歇性缺氧可以导致MCF 7细胞ER α表达的持久抑制。结论 乳腺癌ER α区域性的表达下降与缺氧有关 ,长时间、间歇性的缺氧可以持续性抑制ER α的表达。缺氧可能促使乳腺癌在进展过程中向ER α阴性的表型演变 ,并可能导致对内分泌治疗的耐药。 相似文献
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谢向阳 《国外医学(肿瘤学分册)》2003,30(2):85-88
雄激素受体α(ERα)在乳腺癌发生发展中起重要作用,其活性受共调节因子的调节。对ERα共调节因子的种类作用方式、在乳腺癌细胞中的变化及其在mRNA选择性剪接中的作用分别作了概述。 相似文献
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目的 研究雌激素受体α(ERα)和雌激素受体β(ERβ)在肺癌组织中的表达及与患者临床病理特征和预后的关系.方法 将698例肺癌石蜡标本构建组织芯片,其中非小细胞肺癌(NSCLC)651例(包括腺癌309例,鳞癌342例),小细胞肺癌(SCLC)47例.采用免疫组化法检测ERα和ERβ蛋白在肺癌组织和正常肺组织中的表达,并分析ERα和ERβ蛋白的表达与NSCLC患者临床病理特征和预后的关系.结果 ERα和ERβ蛋白在正常肺组织中的阳性表达率分别为0和25.0%.ERα蛋白在腺癌、鳞癌和SCLC组织中的阳性表达率分别为70.8% (209/295)、51.2% (169/330)19.1% (9/47),差异有统计学意义(P<0.001).ERβ蛋白在腺癌、鳞癌和SCLC组织中的阳性表达率分别为67.3% (200/297)、43.5%(140/322)和66.0% (31/47),差异有统计学意义(P<0.001).ERα蛋白的表达与NSCLC患者的吸烟史、病理分期和淋巴结转移有关(均P<0.05),而与性别、年龄、肿瘤大小和分化程度无关(均P>0.05).ERβ蛋白的表达与患者的性别、吸烟史、病理分期和淋巴结转移有关(均P <0.05),而与患者的年龄、肿瘤大小和分化程度无关(均P>0.05).398例NSCLC患者完成随访,ERα和ERβ蛋白在不同分期和不同组织类型NSCLC中的表达均与患者的预后无关(均P >0.05).结论 ERα和ERβ蛋白在肺腺癌、鳞癌和SCLC组织中的表达存在明显差异.在NSCLC中,ERα和ERβ蛋白的表达与吸烟、病理分期、淋巴结转移均有关,且女性NSCLC患者ERβ蛋白的表达高于男性. 相似文献
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目的探讨肿瘤坏死因子α(TNFα)对乳腺癌SK-BR-3细胞中Krüppel样因子4(KLF4)表达的影响,明确KLF4在促进乳腺癌SK-BR-3细胞凋亡中的作用机制。方法用不同浓度TNFα(0、1、5、10、20 ng/ml)刺激乳腺癌SK-BR-3细胞,采用Western blot法检测KLF4表达水平;用流式细胞术和DAPI染色法分析细胞凋亡情况。结果随着刺激浓度的增高,KLF4表达水平呈剂量依赖性逐渐增多。流式细胞术和DAPI染色显示,TNFα可诱导乳腺癌SK-BR-3细胞凋亡。构建p Ad-GFP和p Ad-GFPKLF4腺病毒表达载体,在乳腺癌SK-BR-3细胞中过表达GFP或GFP-KLF4,再给予TNFα刺激后,流式细胞术观察结果显示,KLF4过表达可促进乳腺癌SK-BR-3细胞凋亡。结论 TNFα可诱导乳腺癌SKBR-3细胞中KLF4表达,KLF4参与了TNFα诱导的乳腺癌SK-BR-3细胞凋亡过程。 相似文献
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雌激素通过与其受体(ERα和ERβ)的特异性结合发挥生物学功能。雌激素受体属于类固醇激素受体家族,与配体结合后调节靶基因的转录。这些转录因子的活性受多种因素调节,包括配体结合、磷酸化、辅助调节因子和效应信号通路(ERE,SP1,AP1)等。靶基因转录的最终结果是调节各种生理过程,例如生殖器官的发育和功能,骨密度,但也可促使乳腺和子宫内膜癌的生长和发育。雌激素受体调节的各种复杂的生物效应与多种蛋白-信号通路关系密切。本文就雌激素受体的生物学特性及其在肿瘤中的作用作一综述。 相似文献
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雌激素相关受体(estrogen-related receptor,ERR)是一类缺乏天然配体的转录因子,属于孤儿核受体家族中的成员.ERR包括雌激素相关受体α(ERRα)、雌激素相关受体β(ERRβ)、雌激素相关受体γ(ERRγ)三个亚型,其受体与乳腺癌和前列腺癌的发生、进展、转移及耐药等过程密切相关,本文对ERRα、ERRβ、ERRγ在乳腺癌和前列腺癌中的作用及其机制作一综述. 相似文献
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Marc P. J. McCafferty Roisin E. McNeill Nicola Miller Michael J. Kerin 《Breast cancer research and treatment》2009,116(3):425-432
The activity of selective estrogen receptor modulators (SERMs) is not fully explained by an estrogen receptor (ER) switch
model that simply turns estrogen activity on or off. A better understanding of the mechanisms involved in estrogen signaling
and the development of drug resistance could help stratify patients into more coherent treatment groups and identify novel
therapeutic candidates. This review describes how interactions between two novel factors known to influence estrogenic activity:
nuclear receptor cofactors—protein partners which modulate estrogen action, and microRNAs—a class of recently discovered regulatory
elements, may impact hormone-sensitive breast cancer. The role of nuclear receptor cofactors in estrogen signaling and the
associations between ER cofactors and breast cancer are described. We outline the activity of microRNAs (miRNAs) and their
associations with breast cancer and detail recent evidence of interactions between the ER and its cofactors and miRNA and
provide an overview of the emerging field of miRNA-based therapeutics. We propose that previously unrecognised interactions
between these two species of regulatory molecules may underlie at least some of the heterogeneity of breast cancer in terms
of its clinical course and response to treatment. The exploitation of such associations will have important implications for
drug development. 相似文献
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背景及目的:基因转染技术是研究乳腺癌细胞雌激素受体(estrogen receptor,ER)的表达及其作用机制的重要手段。本研究检测不同人类乳腺癌细胞株以FuGENE6试剂为载体进行转染时的转染效率,以及ER质粒HEG05转染后ER的表达情况。方法:不同乳腺癌细胞株先用pEGFP—N1质粒转染,流式细胞术(flow cytometry,FCM)对转染效率进行测定。将转染效率高的细胞株分别再用HEGO5转染,用FCM和Western blot方法对ER的表达情况进行检测。结果:乳腺癌细胞株MM-231、MM330、MMl34Ⅵ、MM175Ⅶ、MM157、MM361、MM436、MM453、UaCC812、UACC893、BT-549、BT-20、HBL-100、Hs578t、MCF-7、T-47d、ZR-75-1的转染效率存在很大差异。细胞株HBL-100重复性转染实验的变异系数为5.1。几种转染效率较高的细胞株MCF-7、HBL-100、Hs578t、MM436、MM453和BT-20用HEG05转染后,ER阳性的表达率介于12.9%~54.8%之间,与pEGFP—N1的转染效率相当;不同细胞ER的FCM和Western blot检测结果一致。此外,ER的表达具有一定的细胞周期特异性。结论:FuGENE6试剂介导乳腺癌细胞进行转染时重复性好、结果稳定。HEG05转染后ER的表达情况可分别用Western blot和FCM进行定性、定量检测。 相似文献
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背景与目的:长期以来,雌激素受体(estrogen receptor,ER)阳性乳腺癌患者对内分泌治疗耐药是临床上棘手的难题。目前研究表明,雌激素效应环指蛋白(estrogen-responsive finger protein,Efp)和polo样激酶3(polo-like kinase 3,Plk3)的表达与乳腺癌发展具有密切关系。该研究旨在探讨ER阳性乳腺癌中Efp和Plk3蛋白表达相关性,了解Efp和Plk3表达变化在耐药中的作用。方法:应用免疫组织化学SP法检测74例ER阳性乳腺癌组织中Efp和Plk3蛋白表达情况,结合临床资料进行分析。并采用实时荧光定量聚合酶链反应(real-time fluorescent quantitative polymerase chain reaction,RTFQ-PCR)及蛋白[质]印迹法(Western blot)检测ER阳性乳腺癌MCF-7细胞中Efp和Plk3的基因和蛋白表达变化。结果:74例ER阳性乳腺癌组织中Efp和Plk3蛋白表达与患者的临床病理特征未见任何关系(P>0.05),其中有51例(68.9%)患者Efp表达阳性和23例(31.1%)患者Plk3表达阳性,χ2检验分析结果显示,ER阳性乳腺癌组织中Efp和Plk3具有显著的负相关关系(χ2=8.837,P<0.05)。RTFQ-PCR检测结果显示,MCF-7细胞经雌激素刺激后Efp mRNA的表达显著增加,而Plk3 mRNA的表达无明显变化。Western blot检测结果显示,MCF-7细胞经雌激素和MG132刺激后,Efp的蛋白表达较MG132组显著增加,而Plk3蛋白表达明显下降。结论:在ER阳性乳腺癌患者中Efp和Plk3的蛋白表达呈负相关,Efp高表达可促进Plk3的蛋白降解,对内分泌耐药过程的形成可能产生一定影响。 相似文献
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Ling He Kruttika Bhat Sara Duhacheck-Muggy Angeliki Ioannidis Le Zhang Nhan T. Nguyen Neda A. Moatamed Frank Pajonk 《Neoplasia (New York, N.Y.)》2021,23(2):197
Pro-inflammatory conditions have long been associated with mammary carcinogenesis and breast cancer progression. The underlying mechanisms are incompletely understood but signaling of pro-inflammatory cytokine TNFα through its receptors TNFR1 and TNFR2 is a major mediator of inflammation in both obesity and in the response of tissues to radiation, 2 known risk factors for the development of breast cancer. Here, we demonstrated the loss of one TNFR2 allele led to ductal hyperplasia in the mammary gland with increased numbers of mammary epithelial stem cell and terminal end buds. Furthermore, loss of one TNFR2 allele increased the incidence of breast cancer in MMTV-Wnt1 mice and resulted in tumors with a more aggressive phenotype and metastatic potential. The underlying mechanisms include a preferential activation of canonical NF-κB signaling pathway and autocrine production of TNFα. Analysis of the TCGA dataset indicated inferior overall survival for patients with down-regulated TNFR2 expression. These findings unravel the imbalances in TNFR signaling promote the development and progression of breast cancer, indicating that selective agonists of TNFR2 could potentially modulate the risk for breast cancer in high-risk populations. 相似文献
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Auer D Reimer D Porto V Fleischer M Roessler J Wiedemair A Marth C Müller-Holzner E Daxenbichler G Zeimet AG 《Breast cancer research and treatment》2009,116(1):103-111
This study analyzes the relationship between coxsackie-adenovirus receptor (CAR) expression (transmembrane and soluble isoforms)
and hormone sensitivity in 95 breast cancers. Furthermore, prognostic significance of the expression of the various CAR isoforms
was investigated. In addition, inducibility of CAR expression by estradiol and tamoxifen was assessed in various breast cancer
cell lines. Expression of transmembrane CAR (hCAR) highly correlated with estrogen receptivity, but was independent of the
expression of progesterone receptor (PR). Furthermore, hCAR expression was significantly higher in tumors with low-grade malignancy.
However, no relationship between hCAR expression and tumor size, lymph node status, or survival was revealed. In the hormone
receptor-positive breast cancer cell line T47-D expression of hCAR and its soluble isoforms was increased by treatment with
estradiol and tamoxifen. In contrast, no induction of either CAR isoform was achieved in receptor-negative cell lines. Furthermore,
enhancement of hCAR expression was significantly greater when cells were treated with the histone deacetylase (HDAC) inhibitor
trichostatin A (TSA) than when treated with estradiol or tamoxifen. Moreover, sensitivity to TSA induction of hCAR was considerably
greater in receptor-positive than in receptor-negative cell lines. No additive effect on CAR expression was found when TSA
was combined with either estradiol or tamoxifen. In conclusion, the so far undescribed association between estrogen receptivity
and the expression of hCAR in breast cancer seems to not only reflect a phenotype of low malignancy, but expression of hCAR
may also be directly influenced by ER-specific ligands. 相似文献
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