Notch信号通路与乳腺癌发生关系的研究进展

1983年Artavanis Tsakonas研究组首次克隆了Notch基因,并发现其编码一类大的跨膜受体,即Notch受体.随后相继在线虫、爪蟾、鼠和人等多个物种体内发现其家族不同成员~([1]).Notch信号不仅影响细胞的增殖、分化、凋亡、黏附和上皮细胞-间叶细胞转变(epithelial-mesenchy maltransition,EMT)等活动,在胚胎发育、造血、血细胞发育、血管生成、某些神经系统疾病及肿瘤形成等生理病理过程中起着重要的作用~([1]).     

乳腺癌和癌旁乳腺组织中Notch1基因mRNA及蛋白的表达

目的 检测Notch1基因mRNA及Notch1蛋白在人乳腺癌和癌旁乳腺组织中的表达,分析其临床病理学意义.方法 应用逆转录聚合酶链反应(RT-PCR)方法榆测60例乳腺浸润性导管癌和60例癌旁乳腺组织中Notch1基因mRNA,应用免疫组织化学SP法检测60例乳腺浸润性导管癌、30例导管原位癌及60例癌旁乳腺组织Notch1蛋白的表达,分析Notch1表达水平与乳腺癌临床病理特征的相关性.结果 Notch1基因mRNA在人乳腺浸润性导管癌及癌旁乳腺组织中均有表达.Notch1蛋白在癌旁乳腺组织和导管原位癌中的阳性牢分别为55%(33/60)、70%(21/30),二者差异无统计学意义(P>0.05),在乳腺浸润性导管癌中的阳性率为90%(54/60),明显高于癌旁乳腺组织和导管原位癌的阳性率(P<0.05).乳腺浸润性导管癌Notch1蛋白的高表达与肿瘤的淋巴结转移(P=0.006)、病理学分级(P=0.001)和TNM分期(P=0.022)均呈显著正相关.结论 乳腺浸润性导管癌存在Notch1蛋白的高表达.Notch1蛋白高表达与乳腺癌的恶变演进有关.Notch1基因的表达可能影响乳腺癌的发生、发展.     

乳腺原发癌和相应淋巴结转移癌干细胞Wnt、Notch信号通路相关分子的比较

目的：探讨乳腺原发癌和相应淋巴结转移癌干细胞Wnt、Notch信号通路分子β-catenin、Cyclin D1和Notch1 mRNA表达及意义。方法选取乳腺浸润性导管癌30例,且均伴有淋巴结转移,制备乳腺癌单细胞悬液,通过免疫磁珠分选技术分别提取乳腺原发癌和相应淋巴结转移癌干细胞,采用实时荧光定量PCR技术检测两种癌干细胞Wnt、Notch信号通路关键分子β-catenin、Cyclin D1和Notch1 mRNA的表达。结果乳腺原发癌干细胞和相应淋巴结转移癌干细胞中β-catenin mRNA的表达差异无统计学意义(P>0.05);淋巴结转移癌干细胞中Cyclin D1和Notch1 mRNA的表达显著高于乳腺原发癌干细胞(P<0.01)。结论与乳腺原发癌干细胞相比,淋巴结转移癌干细胞中Cyclin D1和Notch1处于更高的活化状态,具有更高的侵袭和转移能力,有可能成为乳腺癌的新治疗靶点。     

Notch1及其下游靶分子Hes1在肾细胞癌组织中的表达及其临床意义

目的检测Notch1及其下游靶分子Hes1在肾细胞癌组织中的表达情况,并分析Notch1的表达与临床病理特征的相关性。方法利用免疫组织化学染色,Western blot法和实时定量PCR(qRT-PCR)分别检测肾细胞癌组织及对应的癌旁正常肾组织中Notch1的表达,用qRT-PCR检测Notch下游靶分子Hes1的表达,并用SPSS17.0软件分析Notch1的表达水平与临床病理特征的相关性。结果免疫组织化学染色,Western blot法和qRT-PCR结果均显示Notch1在肾细胞癌组织中的表达低于正常肾组织,qRT-PCR结果显示Hes1在肾细胞癌组织中的表达低于正常肾组织,且Notch1的表达与肿瘤Fuhrman分级和AJCC分期呈负相关。结论 Notch1及其下游靶分子Hes1在肾细胞癌的发生发展过程中可能具有肿瘤抑制基因的作用。     

Wnt和Notch信号通路在大鼠创面愈合模型中的表达作用

目的观察Wnt和Notch信号通路在大鼠创面愈合模型中的表达及作用。方法取25只SD大鼠幼鼠,早期用溴脱氧尿苷（BrdU）标记表皮干细胞,注射BrdU 60 d后建立全层皮肤缺损创面模型。于大鼠致伤后0 d、7 d、14 d、21 d、30 d五个时间点分别各断颈处死5只取标本,利用免疫印迹、免疫组化和免疫荧光双标法观察创面愈合过程中Wnt1、β-catenin、c-Myc、Jagged1、Notch1、Hes1和Brdu的表达情况。结果免疫印迹结果显示Wnt和Notch信号通路成员在伤后表达上调,于伤后7 d达高峰,持续表达至伤后30 d。免疫组化结果显示,β-catenin开始在细胞膜低表达,伤后逐渐转变为表皮全层表达,且部分呈现异常核表达;伤后,Notch1在表皮全层表达逐渐上调,且在基底层表达上调显著。免疫荧光提示,BrdU/c-Myc和BrdU/Hes1双染阳性细胞率在伤后上升,于伤后7 d达高峰,持续表达至伤后30 d。结论 Wnt和Notch双信号通路可能通过调控表皮干细胞的增殖分化参与大鼠创面愈合过程。     

布托啡诺调节JAG1/Notch信号通路对乳腺癌细胞恶性生物学行为的影响

目的 研究布托啡诺对乳腺癌细胞恶性生物学行为的影响以及潜在机制。方法 体外培养人乳腺癌细胞MDA-MB-231,CCK-8法检测不同浓度布托啡诺对MDA-MB-231细胞存活率影响;根据实验要求分为对照组、布托啡诺组、布托啡诺+pcDNA3.1组、布托啡诺+pcDNA3.1-JAG1组;EDU法检测细胞增殖能力;Transwell检测细胞迁移与侵袭能力;流式细胞术检测细胞凋亡;平板克隆形成实验检测细胞集落形成能力;RT-qPCR检测JAG1、Notch1 mRNA水平;Western blot检测JAG1、Notch1、Ki67、MMP2、cleaved-Caspase3蛋白水平。结果 选取10μmol/L布托啡诺处理细胞进行后续实验;与对照组相比,布托啡诺组MDA-MB-231细胞EDU阳性细胞率、迁移数量、侵袭数量、克隆集落数、JAG1、Notch1mRNA水平、JAG1、Notch1、Ki67、MMP2蛋白水平显著性降低,凋亡率、cleaved-Caspase3蛋白水平显著性升高（P<0.05）。与布托啡诺+pcDNA3.1组相比,布托啡诺+pcDNA3.1-JAG1组MD...     

Notch1信号在乳腺癌干细胞分化中的作用

目的 探讨Notch1信号与CK5、CK8在乳腺癌干细胞分化中的作用.方法 采用免疫组化SP法检测Notch1、CK5、CK8在96例乳腺浸润性导管癌中的表达.结果 Notch1在浸润性导管癌75%(72/96)表达; CK5在浸润性导管癌中17.7%(17/96)呈现阳性;CK8在浸润性导管癌中92.7%(89/96)表达.5例CK5 /CK8-表型病例中,有1例Notch1阳性;12例CK5 /CK8 表型病例中,4例伴Notch1阳性;77例CK5-/CK8 表型病例中,有67例伴Notch1的表达,并且Notch1与浸润性导管癌的这种免疫表型的分化模式呈相关关系(P=0.000).结论 Notch1信号在乳腺上皮干细胞恶性转化中表达上调,Notch1基因可能是一种癌基因,对乳腺癌干细胞的分化起调节作用.     

乳腺癌和乳腺导管内增生性病变Notch1基因甲基化的检测及临床意义

目的 探讨Notch1基因甲基化与乳腺浸润性导管癌(IDC)及乳腺导管内增生性病变的相关性.方法 用基质辅助激光解析电离时间飞行质谱仪(MALDI-TOF MS)对89例乳腺IDC、20例导管原位癌(DCLS)、11例不典型导管增生(ADH)及20例普通型导管增生(UDH)组织进行Notch1基因甲基化的定量检测.采用...     

Notch1和Bmi-1蛋白在肺癌组织中的表达及意义

BACKGROUND: Studies have found that Notch pathway and Bmi-1 gene both have the ability to regulate stem cell self-renew. Functional dysfunction of the both may have a great relationship with tumorigenesis. OBJECTIVE: To investigate the expression and clinical significance of Notch1 and Bmi-1 protein in lung tissue. METHODS: Eighty-seven lung cancer tissue samples (lung cancer group) and forty pathologically confirmed normal lung tissue samples (normal group) were obtained from related surgeries and included as research objects. The protein expression of Notch1 and Bmi-1 in specimens of these two groups was measured by immunohistochemistry SP method. The relationship between Notch1 and Bmi-1 protein expression and clinicopathological features of lung cancer patients was analyzed. RESULTS AND CONCLUSION: The positive rate of Notch1, Bmi-1 protein expression was respectively 61% and 47%, which was significantly higher in the lung cancer group than that in the normal group (P < 0.05). In the lung cancer group, Notch1 protein expression was significantly positively correlated with Bmi-1 protein expression (r=0.567, P < 0.001). There were no significant differences in Notch1 and Bmi-1 protein expression rates between different genders and different pathological types of patients (P < 0.05). The Notch1 and Bmi-1 protein positive expression rates in poorly-differentiated, TNM stage III-IV lung cancer patients with lymph node metastasis were significantly higher than those in well- and moderately-differentiated, TNM stage I-II lung cancer patients without lymph node metastasis (P < 0.05). These results demonstrate that Notch1 and Bmi-1 protein may have certain relationship with the occurrence and development of lung cancer.       

Notch信号通路蛋白在糖尿病肾病患者肾组织中的表达及意义

目的观察糖尿病肾病肾组织中Notch信号通路的表达情况,探讨其与糖尿病肾病肾脏损害的关系。方法收集10例手术切除的远离肿瘤的瘤旁肾组织及34例糖尿病肾病肾穿刺组织,免疫组化检测Jagged1、Notch1、NICD1和Hes1蛋白表达情况。结果 Jagged1、Notch1、NICD1和Hes1蛋白在糖尿病肾病肾组织中高表达,并与24小时尿蛋白成正相关,而与肾小球滤过率成负相关。结论 Notch信号通路在糖尿病肾病肾组织中激活,与糖尿病肾病肾脏损伤有关。     

Up-regulated expression of Notch1 and Jagged1 in human colon adenocarcinoma

Deregulated expression of Notch molecules is observed in many malignant tumors, however, the expression of Notch1 and Jagged1 in colon adenocarcinoma is still unknown. This study is to investigate the expression of Notch1 and Jagged1 in human colon adenocarcinoma. Sixty-five human colon adenocarcinoma and 60 adjacent nontumor colon tissue sections were detected by immunohistochemistry. Ten paired fresh surgical human colon adenocarcinoma and adjacent nontumor colon samples were analyzed by Western blot and RT-PCR. Both Notch1 and Jagged1 were expressed in the cytoplasm of neoplastic cells of colon adenocarcinoma tissue. The protein and mRNA levels of both molecules were higher in colon adenocarcinoma than in adjacent nontumor tissue. Moreover, Notch1 was positively correlated with tumor stage. This investigation demonstrates that Notch1 and Jagged1 are up-regulated in human colon adenocarcinoma and suggests that Notch1/Jagged1 signaling might play a role in the development of colon adenocarcinoma.     

SIRT1在乳腺癌中的作用

沉默信息调节因子1(sirtuin Type 1,SIRT1)是酵母Sir2的哺乳动物同源体,是一种NAD+依赖的Ⅲ类组蛋白去乙酰化酶,能使组蛋白和非组蛋白去乙酰化,参与细胞多种生理、病理过程,如基因沉默、细胞衰老、寿命延长、抗氧化应激、能量代谢调节、DNA损伤修复、肿瘤发生等.其中SIRT1在乳腺癌的发生中涉及的上下游信号分子众多,信号通路繁杂而交叉.有研究显示SIRT1起着抑制乳腺癌发生的作用;而有的研究结果正相反,SIRT1起着促进乳腺癌发生的作用.     

干扰miR-31表达初期Notch和Hedgehog信号通路相关基因在神经干细胞中的表达变化

目的:研究干扰miR-31表达初期Notch和Hedgehog信号通路相关基因在神经干细胞(NSCs)中的表达变化。方法:利用荧光定量PCR对干扰miR-31表达初期Notch和Hedgehog信号通路相关基因在NSCs中的表达变化进行研究。结果:干扰与过表达miR-31后3 d,NSCs中的Notch信号通路相关基因Notch2的表达均增加,Jag2、Dll3和Hes1等的表达均降低;Hedgehog信号通路相关基因Wnt3的表达均增加,Bmp5与Wnt7a的表达均降低。结论:影响miR-31的表达可引发NSCs发生分化,在此过程中Notch与Hedgehog信号通路中几个基因的表达都产生相应改变,表明miR-31与NSCs分化过程相关。     

Notch1通过非经典的Notch信号通路调节胰腺星形细胞的活化

目的:探讨Notch1在胰腺星形细胞(pancreatic stellate cells,PSCs)活化中的作用。方法:利用免疫组织化学法与免疫荧光双标法检测Notch1在人胰腺导管腺癌(pancreatic ductal adenocarcinoma,PDAC)组织的表达情况;原代分离培养小鼠PSCs,利用油红O染色、Western blot及RT-qPCR法对其进行鉴定,并利用Western blot及RT-qPCR检测Notch1及其下游关键分子HES1的表达情况;转染Notch1小干扰RNA(Notch1 siRNA)至小鼠PSCs后,利用Western blot检测α-平滑肌肌动蛋白(α-smooth muscle actin,α-SMA)、纤连蛋白(fibronectin)、I型胶原(collagen typeⅠ,ColⅠ)、Notch1及HES1的表达情况;利用划痕实验与CCK-8实验检测Notch1 siRNA对小鼠PSCs迁移与细胞活力的影响。结果:免疫组化与免疫荧光双标染色结果显示,Notch1表达在α-SMA阳性的PDAC间质细胞中;成功培养了小鼠PSCs细胞,且...     

Notch信号通路与肝癌的研究进展

Notch信号通路是一种高度保守的信号通路,在调节细胞分化、增殖和凋亡等一系列生理病理过程中都起着关键性的作用。Notch信号在肝癌中频繁发生异常表达及激活突变,其通过多种机制促进肝癌的发生发展,且与肝癌的侵袭、转移和预后密切相关。因此,Notch信号可作为肝癌治疗的一个靶标,为肝癌的治疗提供新的方向和机遇。     

Notch/JNK信号在低氧致大鼠皮层神经元损伤中的作用研究

目的:探讨Notch1/JNK信号通路在缺氧引起的神经元损伤中的作用。方法:原代培养新生SD大鼠皮层神经元,利用低氧条件培养建立缺氧模型。利用CCK-8实验检测在低氧诱导的不同时间,神经元的活性及siRNA干扰后神经元的活性;利用RT-q PCR与Western Blot检测对照组与低氧组神经元中NICD,p-JNK,Caspase-3mRNA与蛋白的表达情况;利用siRNA转染技术转染Notch1 siRNA或JNK siRNA至神经元中后,利用Western Blot检测低氧组与转染组神经元中NICD,p-JNK,Caspase-3蛋白的表达情况。结果:缺氧情况下神经元活性较低,具有时间依赖性;缺氧情况下,神经元的NICD,p-JNK,Caspase-3 mRNA及蛋白的表达均显著升高。抑制神经元中Notch1的活性,可进一步抑制JNK,Caspase-3的表达,改善神经元活性。结论:缺氧导致神经元Notch1信号被激活,Notch信号调节JNK的磷酸化,磷酸化的JNK进一步促进Caspase-3的激活,从而降低神经细胞的活性或促进神经细胞的死亡。     

Jagged1 (JAG1) mutations in Alagille syndrome: increasing the mutation detection rate

Alagille syndrome (AGS) is caused by heterozygous mutations in JAG1, and mutations have been previously reported in about 70% of patients who meet clinical diagnostic criteria. We studied a cohort of 247 clinically well-defined patients, and using an aggressive and sequential screening approach we identified JAG1 mutations in 94% of individuals. Mutations were found in 232 out of 247 patients studied and 83 of the mutations were novel. This increase in the mutation rate was accomplished by combining rigorous clinical phenotyping, with a combination of mutation detection techniques, including fluorescence in situ hybridization (FISH), genomic and cDNA sequencing, and quantitative PCR. This higher rate of mutation identification has implications for clinical practice, facilitating genetic counseling, prenatal diagnosis, and evaluation of living-related liver transplant donors. Our results suggest that more aggressive screening may similarly increase the rate of mutation detection in other dominant and recessive disorders.