AEG-1基因促进乳腺癌细胞株MCF-7转移

目的 观察AEG-1基因在细胞水平对乳腺癌细胞MCF-7转移的影响。方法 通过将siRNA转染进MCF-7细胞,沉默细胞中AEG-1表达量,以转染阴性siRNA作为对照组。分别采用Transwell小室检测细胞迁移侵袭能力、CCK8实验检测细胞增殖能力。同时通过检测细胞中VEGF的变化及HUVEC细胞体外管腔形成实验考察AEG-1对于血管新生的影响。结果 沉默AEG-1,MCF-7细胞的迁移能力、侵袭能力和增殖能力明显受到抑制。沉默AEG-1,MCF-7细胞的VEGF表达明显降低。上清处理HUVEC细胞,沉默AEG-1组的血管新生能力明显受到抑制。结论 沉默AEG-1基因能显著抑制MCF-7细胞转移的多个层面,包括细胞迁移、侵袭、增殖以及血管新生。表明AEG-1基因在乳腺癌转移过程中起着重要作用,也为将来乳腺癌治疗开拓了新思路。     

LKB1 loss promotes colorectal cancer cell metastasis through regulating TNIK expression and actin cytoskeleton remodeling

Colorectal cancer (CRC) is one of the most common malignant tumors. Approximately 5%–6% of CRC cases are associated with hereditary CRC syndromes, including the Peutz–Jeghers syndrome (PJS). Liver kinase B1 (LKB1), also known as STK11, is the major gene responsible for PJS. LKB1 heterozygotic deficiency is involved in intestinal polyps in mice, while the mechanism of LKB1 in CRC remains elusive. In this study, we generated LKB1 knockout (KO) CRC cell lines by using CRISPR-Cas9. LKB1 KO promoted CRC cell motility in vitro and tumor metastases in vivo. LKB1 attenuated expression of TRAF2 and NCK-interacting protein kinase (TNIK) as accessed by RNA-seq and western blots, and similar suppression was also detected in the tumor tissues of azoxymethane/dextran sodium sulfate-induced intestinal-specific LKB1-KO mice. LKB1 repressed TNIK expression through its kinase activity. Moreover, attenuating TNIK by shRNA inhibited cell migration and invasion of CRC cells. LKB1 loss-induced high metastatic potential of CRC cells was depended on TNIK upregulation. Furthermore, TNIK interacted with ARHGAP29 and further affected actin cytoskeleton remodeling. Taken together, LKB1 deficiency promoted CRC cell metastasis via TNIK upregulation and subsequently mediated cytoskeleton remodeling. These results suggest that LKB1-TNIK axis may play a crucial role in CRC progression.     

Loss of Med1/TRAP220 promotes the invasion and metastasis of human non-small-cell lung cancer cells by modulating the expression of metastasis-related genes

Med1/TRAP220 is an essential component of the TRAP/Mediator complex. In this study, we present a novel function of Med1 in human non-small-cell lung cancer (NSCLC) progression. We found that the loss of Med1 expression was strongly associated with increased rates of invasion and metastasis in NSCLC patients. Consistent with lung cancer patient data, the knockdown of Med1 in NSCLC cell lines led to an increase in cell migration and invasion. Med1-depleted cells displayed an increase in metastasis in a xenograft tumor model and in an in vivo metastasis assay. Moreover, a microarray analysis revealed that the mRNA levels of the metastasis-related genes uPAR, ID2, ID4, PTP4A1, PKP3, TGM2, PLD1, TIMP2, RGS2, and HOXA4 were altered upon Med1 knockdown. Collectively, these results suggest that the loss of Med1 increases the invasive potential of human NSCLC cells by modulating the expression of metastasis-related genes.     

Effects of inhibiting JAK on invasion and metastasis of the human breast cancer cells through ERK signaling transduction pathway

Objective: To explore the effects of Janus activated kinase (JAK) inhibitor AG490 on the phosphorylation of extracellular signal regulated protein kinase (ERK) in human breast cancer cells MDA-MB-231 and the roles of JAK in the invasion and metastasis of the human breast cancer cells through ERK signaling transduction pathways.Methods: MDA-MB-231 cells were treated with 20 (mol/L, 40 (mol/L, 80 (mol/L Janus kinase inhibitor AG490 for 24, 48 and 72 h. Proliferation and adhesion of MDA-MB-231 cells to matrigel were measured with MTT assay. When treated with 40 (mol/L AG490 for 24 h, the expressions of P-ERK and MMP-9 of cells were detected by Western-blot and invasion and metastasis of MDA-MB-231 cells were evaluated with transwell chamber.Results: After being treated with 20 (mol/L, 40 (mol/L, 80 (mol/L AG490 for 24, 48 and 72 h, the proliferation of MDA-MB-231 cells was inhibited in a dose-and time-dependent manner. MDA-MB-231 cells treated with 40 (mol/L AG490 for 30, 60, 90 and 120 min resulted in the increasing adhesion of cells to Matrigel in a time-dependent manner. However, capacity of adhesion in the group treated with AG490 was significantly decreased in comparison with the control group (P<0.01). The expression level of P-ERK and MMP-9 were decreased when treated with AG490. After treatment with 40 (mol/L AG490, in invasion assay, the number of cells in AG490 treated group to migrate to filter coated with Matrigel was reduced compared with control group (P<0.05). Meanwhile, in migration assay, the number of cells in AG490 treated group to migrate to filter was also decreased compared with control group (P<0.05).Conclusion: Our study indicates that JAK kinase could affect the activity of ERK signal transduction pathway through the phosphorylation of ERK. The inhibitory effects of JAK kinase on MMP-9 expression and invasion of breast cancer cells were associated with the down-regulation of the ERK signaling pathway.     

促进乳腺癌增殖转移和肿瘤干细胞特征的研究

目的 研究Gankyrin在乳腺肿瘤中的表达及其促进肿瘤进展的分子机制。方法 利用数据库研究Gankyrin在乳腺癌中的表达情况,并分析其表达与患者生存的关系。在BT549和MDA-MB-231乳腺癌细胞系过表达和敲减Gankyrin基因后,利用CCK-8、Transwell和流式细胞实验分析细胞增殖、转移和肿瘤干细胞的比例。结果 通过数据库分析显示Gankyrin在乳腺癌组织表达较高(P＜0.01),其高表达与患者的不良预后有关(P＜0.01)。与正常乳腺组织相比,乳腺癌组织中Gankyrin启动子甲基化水平较低(P＜0.01)。通过在乳腺癌细胞中过表达和敲减Gankyrin基因后,表明Gankyrin具有促进乳腺肿瘤细胞增殖和转移的能力,可以维持乳腺癌细胞的肿瘤干细胞特征(P＜0.01)。结论 Gankyrin在乳腺癌高表达与患者的不良预后相关,其可能作为乳腺癌肿瘤标记物。     

FSIP1促进乳腺癌细胞迁移和侵袭并导致患者不良预后

目的 探讨乳腺癌组织中纤维鞘相互作用蛋白1(FSIP1)表达对乳腺癌细胞侵袭和迁移能力的影响及其与乳腺癌患者预后的关系,从而为乳腺癌的诊断和治疗提供一定的理论参考。方法 收集2004年1月—2018年12月于哈尔滨医科大学附属肿瘤医院确诊的404例乳腺癌患者的乳腺组织样本和病例资料,对收集的乳腺癌患者资料进行回顾性分析并采用Kaplan-Meier方法绘制生存曲线,采用免疫组织化学方法分析FSIP1在乳腺癌和癌旁组织中的表达情况,取乳腺癌细胞系MCF-7、MDA-MB-231、MDA-MB-435、SK-BR-3、T-47D及正常乳腺上皮细胞(HMECs)MCF-10A进行细胞培养,采用CRISPR/CAS9技术敲除乳腺癌细胞系MDA-MB-231和SK-BR-3中的FSIP1基因,通过Western blot实验检测各乳腺癌细胞系中FSIP1蛋白的表达情况并对FSIP1基因敲除结果进行检测,通过细胞迁移和侵袭实验评估FSIP1蛋白敲除对乳腺癌细胞迁移和侵袭能力的影响。结果 与正常乳腺上皮细胞(MCF-10A)相比,乳腺癌细胞系MCF-7、MDA-MB-231、MDA-MB-435、S...     

Hedgehog信号通路与LKB1基因在乳腺癌中的达及其相关性研究

Hedgehog信号通路在乳腺癌中过度激活,LKB1是抑癌基因,有抑制乳腺癌增殖的功能.LKB1过表达可调控Hedgehog信号通路的靶基因CyclinD1系列基因的表达,同时研究发现Hedgehog信号通路中PKA基因起重要作用,其激活与cAMP状态有关,而LKB1基因能影响cAMP的状态.因此,LKB1基因与Hed...     

干扰素诱导跨膜蛋白１对结肠癌ＳＷ４８０细胞株侵袭和转移能力的影响

目的　研究干扰素诱导跨膜蛋白１（ＩＦＩＴＭ１）对结肠癌ＳＷ４８０细胞株侵袭和转移的影响。方法　构建ＩＦＩＴＭ１／ｐＥＧＦＰ-Ｃ３重组质粒并且转染大肠癌细胞株ＳＷ４８０,免疫荧光显微镜和激光共聚焦显微镜（ＬＣＳＭ）、ＲＴ ＰＣＲ和Ｗｅｓｔｅｒｎｂｌｏｔｔｉｎｇ鉴定ＩＦＩＴＭ１／ｐＥＧＦＰ-Ｃ３重组质粒。Ｇ４１８筛选稳定过表达ＩＦＩＴＭ１的ＳＷ４８０细胞株（ＩＦＩＴＭ１／ＳＷ４８０）,细胞侵袭性实验、明胶酶法测定ＭＭＰ-２和ＭＭＰ-９活性,Ｗｅｓｔｅｒｎｂｌｏｔｔｉｎｇ检测ＭＭＰ-９蛋白表达及ＩＦＩＴＭ１／ＳＷ４８０侵袭和转移能力。结果　成功构建ＩＦＩＴＭ１／ｐＥＧＦＰ-Ｃ３重组表达质粒,获得ＩＦＩＴＭ１／ＳＷ４８０细胞株;细胞侵袭实验显示ＳＷ４８０细胞、ＩＦＩＴＭ１／ＳＷ４８０细胞的细胞穿透数分别为（４４８.６４±３８.０９）个和（５４０.４５±４４.６１）个,差异有统计学意义（Ｐ＜０.０１）;明胶酶法测定显示ＩＦＩＴＭ１／ＳＷ４８０细胞ＭＭＰ-２、ＭＭＰ-９活性较ＳＷ４８０和ｐＥＧＰＦ／ＳＷ４８０细胞明显增强。Ｗｅｓｔｅｒｎｂｌｏｔｔｉｎ显示ＩＦＩＴＭ１／ＳＷ４８０细胞ＭＭＰ-９表达水平明显高于ＳＷ４８０和ｐＥＧＦＰ／ＳＷ４８０细胞株。结论　ＩＦＩＴＭ１可增加大肠癌ＳＷ４８０细胞株侵袭和转移的能力。     

Pharmacologic reversion of epigenetic silencing of the PRKD1 promoter blocks breast tumor cell invasion and metastasis

Introduction

DNA methylation-induced silencing of genes encoding tumor suppressors is common in many types of cancer, but little is known about how such epigenetic silencing can contribute to tumor metastasis. The PRKD1 gene encodes protein kinase D1 (PKD1), a serine/threonine kinase that is expressed in cells of the normal mammary gland, where it maintains the epithelial phenotype by preventing epithelial-to-mesenchymal transition.

Methods

The status of PRKD1 promoter methylation was analyzed by reduced representation bisulfite deep sequencing, methylation-specific PCR (MSP-PCR) and in situ MSP-PCR in invasive and noninvasive breast cancer lines, as well as in humans in 34 cases of “normal” tissue, 22 cases of ductal carcinoma in situ, 22 cases of estrogen receptor positive, HER2-negative (ER+/HER2-) invasive lobular carcinoma, 43 cases of ER+/HER2- invasive ductal carcinoma (IDC), 93 cases of HER2+ IDC and 96 cases of triple-negative IDC. A reexpression strategy using the DNA methyltransferase inhibitor decitabine was used in vitro in MDA-MB-231 cells as well as in vivo in a tumor xenograft model and measured by RT-PCR, immunoblotting and immunohistochemistry. The effect of PKD1 reexpression on cell invasion was analyzed in vitro by transwell invasion assay. Tumor growth and metastasis were monitored in vivo using the IVIS Spectrum Pre-clinical In Vivo Imaging System.

Results

Herein we show that the gene promoter of PRKD1 is aberrantly methylated and silenced in its expression in invasive breast cancer cells and during breast tumor progression, increasing with the aggressiveness of tumors. Using an animal model, we show that reversion of PRKD1 promoter methylation with the DNA methyltransferase inhibitor decitabine restores PKD1 expression and blocks tumor spread and metastasis to the lung in a PKD1-dependent fashion.

Conclusions

Our data suggest that the status of epigenetic regulation of the PRKD1 promoter can provide valid information on the invasiveness of breast tumors and therefore could serve as an early diagnostic marker. Moreover, targeted upregulation of PKD1 expression may be used as a therapeutic approach to reverse the invasive phenotype of breast cancer cells.     

Effects of neuregulins on invasion and metastasis of non-overexpression ErbB2 breast cancer cells

Objective: To explore the effects of neuregulins on ErbB2 receptor signal transduction pathway activation, and invasion and metastasis of non-overexpression ErbB2 breast cancer cell MDA-MB-231. Methods: The expressions of neuregulin were detected by immunocytochemistry and Western blot. MDA-MB-231 cells were treated with ErbB2 kinase inhibitor AG825. Proliferations were measured with MTT assay. Invasion and metastasis of MDA-ME-231 cells were evaluated with transwell chamber. The enzyme activities of MMP-2 and MMP-9 were detected by gelatin zymography. The expressions of MMP-2 and HIF-1α were detected by Western blot.Results: MDA-MB-231 cells expressed a relatively higher level of neuregulin. In Western blot, the positive reaction band was found at 44KD which coincides with the molecular weight of NRG. When MDA-MB-231 cells were treated with AG825, the proliferation was inhibited in a time-dose-dependent manner (P＜0.01), invasion and metastasis were also depressed (P＜0.05). The enzyme activities of MMP-2 and MMP-9 were lower (P＜0.05). The expression levels of MMP-2 and HIF-1α were decreased (P＜0.05).Conclusion: Our study indicates that neuregulins are synthesized in MDA-MB-231 cells as transmembrane proteins, neuregulins could activate ErbB2 receptor signal transduction pathway by autocrine or paracrine secretion, and induce invasion and metastasis of MDA-MB-231 cells.     

LKB1 regulates PRMT5 activity in breast cancer

Protein arginine methyltransferase 5 (PRMT5) is the main enzyme responsible for the symmetrical dimethylation of arginine residues on target proteins in both the cytoplasm and the nucleus. Though its activity has been associated with tumor progression in various cancers, the expression pattern of this oncoprotein has been scarcely studied in breast cancer. In the current work, we analyzed its expression in a large cohort of breast cancer patients, revealing higher nuclear PRMT5 levels in ERα-positive tumors and an association with prolonged disease free and overall survival. Interestingly, high PRMT5 nuclear expression was also associated with higher nuclear liver kinase B1 (LKB1), suggesting that a functional relationship may occur. Consistently, several approaches provided evidence that PRMT5 and LKB1 interact directly in the cytoplasm of mammary epithelial cells. Moreover, although PRMT5 is not able to methylate LKB1, we found that PRMT5 is a bona fade substrate for LKB1. We identified T132, 139 and 144 residues, located in the TIM-Barrel domain of PRMT5, as target sites for LKB1 phosphorylation. The point mutation of PRMT5 T139/144 to A139/144 drastically decreased its methyltransferase activity, due probably to the loss of its interaction with regulatory proteins such as MEP50, pICln and RiOK1. In addition, modulation of LKB1 expression modified PRMT5 activity, highlighting a new regulatory mechanism that could have clinical implications.     

透明质酸酶与血管内皮生长因子在人乳腺癌侵袭与转移中的作用

目的研究透明质酸酶(H yase)与血管内皮生长因子(VEG F)在人乳腺癌侵袭与转移中的意义。方法应用组织匀浆、ELSA及免疫组化等方法测定H yase和VEG F在人乳腺癌中的表达并对其病理特征进行比较。结果乳腺癌组织学分级Ⅰ级、Ⅱ级、Ⅲ级组H yase的均值分别为(3.99±1.91)m U/g、(8.01±2.59)m U/g和(12.00±3.96)m U/g,Ⅲ级和Ⅱ级组H yase表达明显高于Ⅰ级组,Ⅲ级组明显高于Ⅱ级组,其差异具有显著的统计学意义(P<0.05)。乳腺癌无淋巴结转移组和淋巴结转移组H yase的均值分别为(5.25±2.84)m U/g和(8.21±3.26)m U/g,乳腺癌淋巴结转移组H yase表达明显高于无淋巴结转移组。VEG F阳性率在淋巴结转移组为82.6%,明显高于无淋巴结转移组33.3%(P<0.05)。VEG F阳性组和阴性组H yase为(8.39±3.26)m U/g和(5.16±2.58)m U/g,二者间具有显著性统计学差异(P<0.05)。结论H yase和VEG F一样,与人乳腺癌侵袭与转移相关。     

Identification of the functional role of AF1Q in the progression of breast cancer

A novel highly metastatic MDA-MB-231HM cells, derived from MDA-MB-231, was established in our institute. RT-PCR, real-time PCR and Western blot showed that AF1Q gene was differentially expressed between highly metastatic MDA-MB-231HM cells and its parental MDA-MB-231 cells. However, its molecular mechanisms in breast cancer metastasis remain to be characterized. To investigate the effects of AF1Q on the progression of human breast cancer cells, in the present study, recombinant expression plasmid vectors of the human AF1Q gene was transfected into MDA-MB-231 cells. We demonstrated that AF1Q overexpression enhanced the in vitro proliferation and invasive potential of breast cancer cells. Focused microarray analyses showed that 22 genes were differentially expressed between AF1Q transfected cells and its parental counterparts. Integrin alpha3, accompanied by up-regulation of Ets-1 and MMP-2, significantly enhanced the in vitro invasive potential of human breast cancer cells mediated by AF1Q. Estrogen-responsive ring finger protein gene (EFP), also played a role in the enhancement of in vitro proliferation of human breast cancer cells mediated by AF1Q, accompanied by down-regulation of 14-3-3delta. The association was ERalpha independent. These results were further demonstrated by RNA interference (RNAi) experiment in vitro. In in vivo study, we also demonstrated that AF1Q transfected breast cancer cells grew much faster and had more pulmonary metastases than vector-transfected or its parental counterparts. On the contrary, AF1Q knockdown cells grew slower and had less pulmonary metastasis. Similar effects of AF1Q on integrin alpha3, Ets-1, MMP-2, EFP, and 14-3-3delta expression observed in vitro studies were also found in the in vivo study. Taken together, these results provide functional evidences that overexpression of AF1Q leads to a more progression in human breast cancer, at least in part, through regulating the integrin alpha3, Ets-1, MMP-2, EFP, and 14-3-3delta expression.     

E-cadherin在胃癌浸润与转移中作用的研究进展

肿瘤浸润与转移是胃癌的基本特征,也是引起晚期胃癌患者死亡的首要因素。上皮性钙粘蛋白（E-cadherin）在胃癌发生、发展过程中发挥着重要作用,其表达减少或缺失可诱导上皮间充质转化（MET）的发生。深入研究E-cadherin与胃癌的关系将有助于了解胃癌浸润与转移调控机制,从而为胃癌的临床治疗提供新的理论依据。本文就E-cadherin在胃癌浸润与转移中作用的研究进展作一综述。     

Effects of bone sialoprotein on pancreatic cancer cell growth, invasion and metastasis

Bone sialoprotein (BSP) is an acidic glycoprotein that plays an important role in cancer cell growth, migration and invasion. The expression, localization and possible function of BSP in chronic pancreatitis (CP) and pancreatic ductal adenocarcinoma (PDAC) were analyzed by QRT-PCR, laser capture microdissection, DNA microarray analysis, immunoblotting, radioimmunoassays and immunohistochemistry as well as cell growth, invasion, scattering, and adhesion assays. BSP mRNA was detected in 40.7% of normal, in 80% of CP and in 86.4% of PDAC samples. The median BSP mRNA levels were 6.1 and 0.9copies/microl cDNA in PDAC and CP tissues, respectively, and zero copies/microl cDNA in normal pancreatic tissues. BSP was weakly present in the cytoplasm of islet cells and ductal cells in 20% of normal pancreatic tissues. BSP was localized in the tubular complexes of both CP and PDAC, as well as in pancreatic cancer cells. Five out of 8 pancreatic cancer cell lines expressed BSP mRNA. Recombinant BSP (rBSP) inhibited Capan-1 and SU8686 pancreatic cancer cell growth, with a maximal effect of -46.4+/-12.0% in Capan-1 cells and -45.7+/-14.5% in SU8686 cells. rBSP decreased the invasion of SU8686 cells by -59.1+/-11.2% and of Capan-1 cells by -13.3+/-3.8% (P<0.05), whereas it did not affect scattering or adhesion of both cell lines. In conclusion, endogenous BSP expression levels in pancreatic cancer cells and low to absent BSP expression in the surrounding stromal tissue elements may indirectly act to enhance the proliferation and invasion of pancreatic cancer cells.     

沉默UHRF1对乳腺癌细胞增殖和转移的影响

目的 探讨UHRF1对乳腺癌MDA-MB-231细胞增殖以及侵袭的影响及其相关机制。方法 采用四甲基偶氮唑盐微量酶反应比色法(MTT)检测沉默UHRF1基因后对乳腺癌MDA-MB-231细胞活力的影响;应用克隆形成实验检测沉默UHRF1后对乳腺癌MDA-MB-231细胞存活的影响;吖啶橙-溴乙锭(AO/EB)检测沉默UHRF1后对乳腺癌MDA-MB-231细胞凋亡的影响;Caspase-3活性试剂盒检测沉默UHRF1后乳腺癌细胞Casapse-3活性的变化;Western blot法检测细胞中凋亡相关蛋白Bcl-2、Bax、Bad、p-Bad、XIAP、p53、p21^Cip1/Waf1和p16^INK4a的表达;应用Transwell实验研究沉默UHRF1对MDA-MB-231细胞侵袭能力的影响;Wound Healing实验研究沉默UHRF1后对其迁移能力的影响。结果 沉默UHRF1使乳腺癌MDA-MB-231细胞活力降低;克隆形成实验结果显示沉默UHRF1后MDA-MB-231细胞存活能力降低,AO/EB染色显示沉默UHRF1促进MDA-MB-231细胞凋亡。同时Caspase-3活性实验结果显示沉默UHRF1后乳腺癌MDA-MB-231细胞Caspase-3的活性增加;Western blot结果显示,沉默UHRF1后,能够使凋亡蛋白Bad、XIAP和Bax的表达上调,同时抗凋亡蛋白p-Bad,Bcl-2的表达下调,也使p53,p21Cip1/Waf1,p16^INK4a蛋白表达升高;Transwell以及Wound Healing实验证明沉默UHRF1能够抑制乳腺癌MDA-MB-231细胞侵袭和迁移。结论 沉默UHRF1能够抑制乳腺癌MDA-MB-231细胞活力和存活,并抑制乳腺癌MDA-MB-231的侵袭和迁移。沉默UHRF1通过调控p53,p21Cip1/Waf1,p16^INK4a信号发挥作用。     

抑癌基因LKB1与乳腺癌他莫昔芬耐药性之间的关系

目的:研究抑癌基因LKB1对乳腺癌他莫昔芬耐药的影响及机制。方法:运用免疫组化技术对68例乳腺癌组织中LKB1、雌激素受体（ER）和孕激素受体（PR）的表达进行检测,并且利用GEPIA数据库验证实验结果;利用Kaplan-Meier Plotter数据库分析LKB1基因与ER/PR阳性的Luminal A/B亚型乳腺癌预后之间相关性;运用实时定量PCR、免疫印迹和免疫荧光技术分析LKB1在他莫昔芬耐药细胞系中的表达及定位;运用免疫印迹和免疫荧光技术分析他莫昔芬对LKB1表达及定位的影响。结果:在乳腺癌中LKB1与ER/PR的表达呈现显著的正相关性,ER/PR（+++）和ER/PR（+）两组间LKB1的表达差异具有显著的统计学意义（P＜0.001）;LKB1的表达量与乳腺癌预后呈现正相关性,在Luminal A/B亚型的乳腺癌中LKB1表达越低其预后越差;在他莫昔芬耐药细胞系及对照细胞中LKB1的mRNA和蛋白表达量差异无统计学意义,但是在耐药细胞中LKB1的定位发生了从细胞质向细胞核的移行;在体外他莫昔芬能够诱导LKB1表达并且促进LKB1从细胞质向细胞核的移行。结论:在Luminal A/B亚型的乳腺癌中,LKB1的低表达是一种不良预后的指标,并且该蛋白从细胞质向细胞核的移行与乳腺癌他莫昔芬耐药密切相关,而耐药与蛋白的表达量无关。