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KIF3B基因?qū)θ幮匀榘┘?xì)胞生物學(xué)特性和阿霉素化療敏感性的影響

2021-08-18 08:50張潤澤鄭艷賈惠卿遲菁華項(xiàng)鋒鋼王成勤
關(guān)鍵詞:細(xì)胞周期乳癌質(zhì)粒

張潤澤 鄭艷 賈惠卿 遲菁華 項(xiàng)鋒鋼 王成勤

[摘要] 目的 研究KIF3B基因?qū)θ幮匀榘㎝DA-MB-231細(xì)胞生物學(xué)特性和阿霉素化療敏感性的影響。

方法 用Western blot技術(shù)檢測KIF3B在人三陰性乳癌細(xì)胞系MDA-MB-231和MDA-MB-468中的表達(dá),取KIF3B高表達(dá)細(xì)胞MDA-MB-231用于后續(xù)實(shí)驗(yàn)。用sh-NC質(zhì)粒轉(zhuǎn)染MDA-MB-231細(xì)胞作為對照組,用sh-KIF3B沉默質(zhì)粒轉(zhuǎn)染MDA-MB-231細(xì)胞作為實(shí)驗(yàn)組。應(yīng)用Western blot方法檢測基因沉默效率和基因沉默后上皮-間質(zhì)轉(zhuǎn)化(EMT)相關(guān)蛋白E-cadherin、基質(zhì)金屬蛋白酶2(MMP-2)和MMP-9表達(dá)變化,Transwell實(shí)驗(yàn)檢測細(xì)胞遷移、侵襲能力變化,流式細(xì)胞術(shù)檢測細(xì)胞周期變化,MTT實(shí)驗(yàn)檢測細(xì)胞增殖能力和對阿霉素化療敏感性的變化。

結(jié)果

KIF3B在三陰性乳癌細(xì)胞MDA-MB-231中高表達(dá),而在MDA-MB-468中低表達(dá)(t=19.92,P<0.01)。沉默MDA-MB-231細(xì)胞KIF3B基因后,細(xì)胞遷移、侵襲數(shù)目明顯減少(t=29.54、18.32,P<0.01),G0/G1期細(xì)胞比例降低而G2/M期細(xì)胞

比例增加(t=4.82、19.05,P<0.01),同時細(xì)胞增殖能力被顯著抑制(F=7.56~270.09,P<0.01),對阿霉素化療敏感性明顯增加(F=26.37~167.11,P<0.01),E-cadherin表達(dá)升高(t=19.71,P<0.01),而MMP-2和MMP-9表達(dá)降低(t=26.57、16.11,P均<0.01)。

結(jié)論 沉默三陰性乳癌MDA-MB-231細(xì)胞KIF3B基因表達(dá)可以抑制細(xì)胞增殖、阻滯細(xì)胞周期并增加細(xì)胞對阿霉素化療敏感性,并可以通過EMT抑制細(xì)胞遷移和侵襲。

[關(guān)鍵詞] 驅(qū)動蛋白超家族蛋白3B;三陰性乳癌;細(xì)胞增殖;腫瘤轉(zhuǎn)移;細(xì)胞周期;多柔比星;抗藥性,腫瘤

[中圖分類號] R737.9

[文獻(xiàn)標(biāo)志碼] A

[文章編號] 2096-5532(2021)03-0321-06

doi:10.11712/jms.2096-5532.2021.57.122

[開放科學(xué)(資源服務(wù))標(biāo)識碼(OSID)]

[網(wǎng)絡(luò)出版] https://kns.cnki.net/kcms/detail/37.1517.R.20210628.1618.004.html;2021-06-29 09:40:11

EFFECT OF THE KIF3B GENE ON THE BIOLOGICAL CHARACTERISTICS AND DOXORUBICIN CHEMOSENSITIVITY OF TRIPLE-NEGATIVE BREAST CANCER CELLS

ZHANG Runze, ZHENG Yan, JIA Huiqing, CHI Jinghua, XIANG Fenggang, WANG Chengqin

(Department of Pathology, School of Basic Medicine, Qingdao University, Qingdao 266071, China)

[ABSTRACT]Objective To investigate the effect of the KIF3B gene on the biological characteristics and doxorubicin chemosensitivity of triple-negative breast cancer MDA-MB-231 cells.

Methods Western blot was used to measure the expression of KIF3B in human triple-negative breast cancer cell lines MDA-MB-231 and MDA-MB-468, and the MDA-MB-231 cells with high expression of KIF3B were selected for subsequent experiments. MDA-MB-231 cells transfected with sh-NC plasmid were established as control group, and those transfected with sh-KIF3B silencing plasmid were established as experimental group. Western blot was used to measure silencing efficiency and changes in the expression of the epithelial-mesenchymal transition (EMT)-related proteins E-cadherin, matrix metallopeptidase-2 (MMP-2), and matrix metallopeptidase-9 (MMP-9); Transwell assay was used to measure the changes in cell migration and invasion abilities; flow cytometry was used to observe the change in cell cycle; MTT assay was used to measure the changes in proliferative capacity and doxorubicin chemosensitivity.

Results KIF3B showed high expression in triple-negative breast cancer MDA-MB-231 cells and low expression in MDA-MB-468 cells (t=19.92,P<0.01). After the KIF3B gene was silenced in MDA-MB-231 cells, there were significant reductions in the number of migrating and invading cells (t=29.54,18.32;P<0.01), a significant reduction in the proportion of cells in G0/G1 phase, and a significant increase in the proportion of cells in G2/M phase (t=4.82,19.05;P<0.01). Meanwhile, cell proliferation was significantly inhibited (F=7.56-270.09,P<0.01), and doxorubicin sensitivity was significantly increased (F=26.37-167.11,P<0.01). There were an increase in the expression of E-cadherin (t=19.71,P<0.01) and reductions in the expression of MMP-2 and MMP-9 (t=26.57,16.11;P<0.01).

Conclusion Silencing of the KIF3B gene in triple-negative breast cancer MDA-MB-231 cells can inhibit cell proliferation, cause cell cycle arrest, and increase the doxorubicin chemosensitivity of cells, and it can also inhibit cell migration and invasion through EMT.

[KEY WORDS]kinesin superfamily proteins 3B; triple negative breast neoplasms; cell proliferation; neoplasm metastasis; cell cycle;doxorubicin; drug resistance, neoplasm

乳癌是全世界女性最常見的惡性腫瘤,也是第二大常見的癌癥致死原因[1]。據(jù)統(tǒng)計(jì),乳癌發(fā)病率占全身各種惡性腫瘤的7%~10%。三陰性乳癌(TNBC)是指雌激素受體(ER)、孕激素受體(PR)和人表皮生長因子受體(HER2)表達(dá)均為陰性的乳癌,占所有乳癌病理類型的12%~17%[2]。TNBC好發(fā)于相對年輕的婦女,具有預(yù)后差、復(fù)發(fā)率高、轉(zhuǎn)移率高和死亡率高等特點(diǎn),已成為近年來乳癌研究和關(guān)注的焦點(diǎn)。已有研究證實(shí),與Luminal型和HER2過表達(dá)型的乳癌相比,TNBC對新輔助化療更加敏感,其病理完全緩解(PCR)率更高[3]。

驅(qū)動蛋白超家族蛋白(KIFs)是一類分子馬達(dá),在細(xì)胞內(nèi)起著運(yùn)輸媒介的作用,它可以依靠微管等細(xì)胞骨架結(jié)構(gòu)將細(xì)胞內(nèi)貨物(如囊泡、細(xì)胞器、蛋白質(zhì)復(fù)合物和RNA等)運(yùn)輸?shù)郊?xì)胞內(nèi)的指定位置[4]。KIFs有14個亞家族,由45個成員組成。KIF3B是KIF3亞家族的成員,它是一種重要的蛋白質(zhì),在有絲分裂期間,KIF3B負(fù)責(zé)囊泡運(yùn)輸和膜擴(kuò)張,從而調(diào)節(jié)細(xì)胞遷移。近年來,KIF3B與疾病的發(fā)生和發(fā)展之間的關(guān)系越來越受到關(guān)注[5]。已有研究發(fā)現(xiàn),KIF3B在胰腺癌、肝癌、口腔鱗癌、精原細(xì)胞瘤、胃癌、結(jié)腸直腸癌和前列腺癌中存在異常表達(dá)[5-11]。但目前尚未有關(guān)于KIF3B與TNBC關(guān)系的報道。本研究擬沉默乳癌細(xì)胞中KIF3B基因,以觀察其對細(xì)胞增殖、遷移、侵襲、細(xì)胞周期、上皮-間質(zhì)轉(zhuǎn)化(EMT)相關(guān)蛋白表達(dá)和阿霉素敏感性的影響。

1 材料與方法

1.1 實(shí)驗(yàn)材料

人TNBC細(xì)胞株MDA-MB-231和MDA-MB-468購自中國科學(xué)院(中國上海);KIF3B抗體購自美國Santa Cruz公司;β-actin抗體購自武漢云克隆科技股份有限公司;E-cadherin抗體購自英國 Abcam 公司;基質(zhì)金屬蛋白酶2(MMP-2)和MMP-9抗體均購自北京博奧森生物技術(shù)有限公司;羊抗鼠和羊抗兔二抗均購自Bioworld公司;sh-KIF3B沉默質(zhì)粒及sh-NC質(zhì)粒購自上海吉凱基因化學(xué)技術(shù)有限公司;Transwell小室購自美國Corning公司;DMEM培養(yǎng)基購自美國Hyclone公司;Matrigel基質(zhì)膠購自美國BD生物技術(shù)公司;胎牛血清購自美國Gibco公司;增強(qiáng)化學(xué)發(fā)光(ECL)試劑盒購于美國Millipore公司;LipofectamineTM 2000 購于美國Invitrogen公司;碘化丙啶(PI)溶液、MTT粉末、二甲基亞砜(DMSO)、鹽酸阿霉素、結(jié)晶紫粉末均購自北京索萊寶科技有限公司;RNAseA溶液購于天根生化科技有限公司。

1.2 實(shí)驗(yàn)方法

1.2.1 細(xì)胞培養(yǎng)與轉(zhuǎn)染 將MDA-MB-231細(xì)胞和MDA-MB-468細(xì)胞置于含有體積分?jǐn)?shù)0.10胎牛血清的DMEM培養(yǎng)基中,在37 ℃、含體積分?jǐn)?shù)0.05 CO2的培養(yǎng)箱中常規(guī)培養(yǎng)。用Western blot法檢測MDA-MB-231細(xì)胞和MDA-MB-468細(xì)胞KIF3B表達(dá),取KIF3B高表達(dá)細(xì)胞MDA-MB-231用于后續(xù)實(shí)驗(yàn)。轉(zhuǎn)染前1 d將處于對數(shù)生長期的MDA-MB-231細(xì)胞接種到6孔板中,達(dá)到70%融合度時,按照說明書方法用LipofectamineTM2000把質(zhì)粒轉(zhuǎn)染細(xì)胞,培養(yǎng)72 h用于后續(xù)實(shí)驗(yàn)。將未經(jīng)處理的MDA-MB-231細(xì)胞作為MOCK組,將轉(zhuǎn)染sh-NC質(zhì)粒的MDA-MB-231細(xì)胞作為sh-NC組,將轉(zhuǎn)染sh-KIF3B沉默質(zhì)粒的MDA-MB-231細(xì)胞作為sh-KIF3B組。

1.2.2 Western blot法檢測細(xì)胞中KIF3B及EMT相關(guān)蛋白表達(dá) 提取MDA-MB-231細(xì)胞和MDA-MB-468細(xì)胞蛋白,用BCA法檢測蛋白濃度,加入蛋白上樣緩沖液煮沸。行SDS-PAGE凝膠電泳分離蛋白,300 mA轉(zhuǎn)膜2 h將蛋白轉(zhuǎn)至PVDF膜上,室溫下用50 g/L脫脂奶粉封閉2 h,分別加入一抗KIF3B(1∶500)、E-cadherin(1∶1 000)、MMP-2(1∶1 000)、

MMP-9(1∶1 000)和β-actin(1∶4 000)

4 ℃孵育過夜,TBST洗膜3次,加入相應(yīng)二抗(1∶4 000)室溫孵育2 h,重復(fù)TBST洗膜步驟,最后加入ECL后曝光顯影并分析條帶灰度值。目的蛋白相對表達(dá)量以目的條帶灰度值/β-actin條帶灰度值表示。

比較不同細(xì)胞KIF3B表達(dá)效率,取KIF3B高表達(dá)細(xì)胞MDA-MB-231用于后續(xù)沉默實(shí)驗(yàn)。重復(fù)上述步驟,提取對數(shù)生長期的MOCK組、sh-KIF3B組和sh-NC組細(xì)胞蛋白,檢測KIF3B沉默效率。

1.2.3 Transwell實(shí)驗(yàn)檢測細(xì)胞遷移及侵襲能力

取對數(shù)生長期的sh-KIF3B組和sh-NC組細(xì)胞,用胰蛋白酶消化后重懸于無血清DMEM培養(yǎng)基,調(diào)整細(xì)胞密度為1×108/L,在Transwell小室上室(均勻鋪稀釋過的50 mL Matrigel基質(zhì)膠,Matrigel基質(zhì)膠∶無血清培養(yǎng)基=1∶8)均勻加入200 μL細(xì)胞懸液,下室加入600 μL含體積分?jǐn)?shù)0.15胎牛血清的培養(yǎng)基。當(dāng)觀察到下室有細(xì)胞穿過后,取出上室,吸出培養(yǎng)基并用PBS沖洗,用棉棒輕輕擦去上室未穿過的細(xì)胞,多聚甲醛固定15 min,5 g/L結(jié)晶紫染色30 min,流水沖洗干凈,晾干后200倍光鏡下隨機(jī)選取5個視野觀察并計(jì)數(shù)。

1.2.4 MTT實(shí)驗(yàn)檢測細(xì)胞增殖 將處于對數(shù)生長期的sh-KIF3B組和sh-NC組細(xì)胞以每孔3×103個接種于96孔板,每組分別接種6個復(fù)孔,將細(xì)胞置于37 ℃、含體積分?jǐn)?shù)0.05 CO2的培養(yǎng)箱中培養(yǎng),分別于培養(yǎng)1、2、3、4、5 d后,向各孔中加入20 μL MTT(PBS配制,5 g/L)溶液并于培養(yǎng)箱孵育2 h,棄去上清液,每孔中加入DMSO溶液150 μL,低速震蕩10 min,使用全功能微孔板檢測儀檢測各孔490 nm波長處的吸光度(A)值,分析數(shù)據(jù)并繪制細(xì)胞生長曲線。

1.2.5 流式細(xì)胞術(shù)檢測細(xì)胞周期 取對數(shù)生長期的sh-KIF3B組和sh-NC組細(xì)胞胰蛋白酶消化后離心,用預(yù)冷的PBS洗滌3次,加入體積分?jǐn)?shù)0.70乙醇4 ℃固定過夜,再次使用PBS溶液洗滌3次后加入200 μL PBS和2 μL RNaseA(終濃度為20 mg/L)重懸細(xì)胞,37 ℃孵育30 min,再加入 500 μL PI 染液(終濃度為 50 mg/L),避光孵育30 min,最后使用流式細(xì)胞儀檢測細(xì)胞周期分布。

1.2.6 MTT實(shí)驗(yàn)檢測細(xì)胞活性 將對數(shù)生長期的sh-KIF3B組和sh-NC組細(xì)胞,以每孔1×104個接種于96孔板,待細(xì)胞貼壁后,再分別加入阿霉素使其濃度達(dá)到0.10、0.25、0.50、1.00、2.00、5.00 μmol/L,同時設(shè)置空白組,每組設(shè)置6個復(fù)孔,繼續(xù)培養(yǎng)48 h后,向各孔中加入20 μL MTT(PBS配制,5 g/L)溶液并于培養(yǎng)箱孵育2 h,棄去上清液,每孔加入DMSO溶液150 μL,低速震蕩10 min,用全功能微孔板檢測儀檢測各孔490 nm波長處吸光度(A)值。計(jì)算各給藥組的細(xì)胞存活率。細(xì)胞存活率(%)=(實(shí)驗(yàn)組A值-空白組A值)/(對照組A值-空白組A值)×100%。

以上所有實(shí)驗(yàn)均獨(dú)立重復(fù)3次。

1.3 統(tǒng)計(jì)學(xué)分析

應(yīng)用SPSS 25.0軟件進(jìn)行統(tǒng)計(jì)學(xué)分析。正態(tài)分布計(jì)量數(shù)據(jù)以±s表示,兩組間比較采用t檢驗(yàn),多組間比較采用單因素方差分析及析因設(shè)計(jì)的方差分析。以P<0.05表示差異有統(tǒng)計(jì)學(xué)意義。

2 結(jié)? 果

2.1 TNBC細(xì)胞系中KIF3B蛋白表達(dá)及沉默效率

Western blot法檢測結(jié)果顯示,KIF3B蛋白在MDA-MB-231中呈高表達(dá),而在MDA-MB-468細(xì)胞中呈低表達(dá),兩種細(xì)胞KIF3B蛋白表達(dá)比較差異有統(tǒng)計(jì)學(xué)意義(t=19.92,P<0.01)。將MDA-MB-231細(xì)胞用于沉默KIF3B基因,分別轉(zhuǎn)染sh-NC質(zhì)粒和sh-KIF3B沉默質(zhì)粒。Western blot法檢測結(jié)果顯示,sh-KIF3B組KIF3B蛋白表達(dá)較MOCK組和sh-NC組明顯減少,差異有統(tǒng)計(jì)學(xué)意義(F=284.56,P<0.01)。表明KIF3B基因成功沉默。見圖1。

2.2 沉默KIF3B基因?qū)NBC細(xì)胞遷移、侵襲能力的影響

Transwell遷移實(shí)驗(yàn)顯示,沉默MDA-MB-231細(xì)胞KIF3B基因后,sh-KIF3B組遷移細(xì)胞數(shù)目(269.4±21.4)明顯低于sh-NC組(754.2±29.8),差異有統(tǒng)計(jì)學(xué)意義(t=29.54,P<0.01)。侵襲實(shí)驗(yàn)顯示,沉默MDA-MB-231細(xì)胞KIF3B基因后,sh-NC組侵襲細(xì)胞數(shù)目為(1 120.0±53.5)個,sh-KIF3B組為(452.7±33.5)個,兩組比較差異有顯著意義(t=18.32,P<0.01)。見圖2。

2.3 沉默KIF3B對TNBC細(xì)胞增殖能力的影響

MTT實(shí)驗(yàn)結(jié)果表明,沉默KIF3B對TNBC細(xì)胞增殖能力影響的組別與時間之間存在交互效應(yīng)(F組別×?xí)r間=49.601,P<0.01)。MDA-MB-231細(xì)胞轉(zhuǎn)染sh-KIF3B質(zhì)粒后,同一時間下sh-KIF3B組細(xì)胞增殖能力明顯低于sh-NC組,差異有統(tǒng)計(jì)學(xué)意義(F=7.56~270.09,P<0.01)。見表1。

2.4 沉默KIF3B對TNBC細(xì)胞周期的影響

流式細(xì)胞術(shù)結(jié)果顯示,sh-NC組和sh-KIF3B組G0/G1期細(xì)胞比例分別為(78.29±1.99)%和(71.55±1.39)%,G2/M期細(xì)胞比例分別為(4.72±0.32)%和(10.13±0.38)%。與sh-NC組相比,sh-KIF3B組細(xì)胞G0/G1期比例顯著減少,而G2/M期比例則顯著增多,差異均有統(tǒng)計(jì)學(xué)意義(t=4.82、19.05,P<0.01)。見圖3。

2.5 沉默KIF3B對TNBC細(xì)胞阿霉素敏感性的影響

MTT實(shí)驗(yàn)結(jié)果顯示,沉默KIF3B后TNBC細(xì)胞對阿霉素敏感性影響的組別與濃度存在交互效應(yīng)(F組別×濃度=15.201,P<0.01)。在相同濃度阿霉素作用下,sh-KIF3B組細(xì)胞存活率較低,表明沉默KIF3B基因后MDA-MB-231細(xì)胞對阿霉素敏感性明顯上升,差異有顯著意義(F=26.37~167.11,P<0.01)。見表2。

2.6 沉默KIF3B對EMT相關(guān)蛋白表達(dá)的影響

sh-NC組和sh-KIF3B組細(xì)胞EMT相關(guān)蛋白E-cadherin、MMP-2和MMP-9的相對表達(dá)量見圖4。與sh-NC組相比較,sh-KIF3B組E-cadherin表達(dá)升高,差異有統(tǒng)計(jì)學(xué)意義(t=19.71,P<0.01);MMP-2和MMP-9表達(dá)降低(t=26.57、16.11,P<0.01)。

3 討? 論

TNBC具有預(yù)后差、復(fù)發(fā)率高、轉(zhuǎn)移率高和死亡率高等特點(diǎn),已成為近年來乳癌研究和關(guān)注的焦點(diǎn)。由于缺乏相應(yīng)治療靶點(diǎn),TNBC病人無法從內(nèi)分泌治療或抗HER2治療中獲益。因此,無論是早期還是晚期的TNBC病人,化療是目前最主要的治療方法,并且與其他亞型的乳癌病人相比,TNBC病人對化療有更高的反應(yīng)率。大量研究結(jié)果顯示,TNBC對蒽環(huán)類和紫杉醇藥物治療敏感,目前臨床上針對TNBC的新輔助化療方案主要以蒽環(huán)類和紫杉醇藥物為基礎(chǔ)[12-13]。但除了傳統(tǒng)化療外,TNBC的治療手段非常有限,因此迫切需要尋找一個新的TNBC治療靶點(diǎn)。

KIFs的功能已廣為人知,其與神經(jīng)退行性疾病、糖尿病和腎病等疾病的發(fā)生密切相關(guān)[14-16]。作為KIF3亞家族的成員,KIF3B參與許多生理過程,包括有絲分裂、減數(shù)分裂和大分子的運(yùn)輸。在有絲分裂期間,KIF3B扮演著囊泡運(yùn)輸和膜擴(kuò)張的角色,KIF3B還可以調(diào)節(jié)細(xì)胞遷移、細(xì)胞周期,促進(jìn)細(xì)胞增殖和存活[4]。KIF3B亞基突變使多囊腎病小鼠產(chǎn)生致命表型[17-19]。在遠(yuǎn)端腎小管酸中毒中,KIF3B和人腎陰離子交換劑1(kAE1)在人腎組織中共表達(dá),并且KIF3B可能參與了HEK293T細(xì)胞中kAE1的積累[16]。KIF3B也在大鼠腎臟缺血/再灌注損傷和急性脊髓損傷中起著重要作用[20-21]。KIF3B也是皮質(zhì)神經(jīng)元可塑性的負(fù)調(diào)節(jié)劑[22]。大量研究表明,驅(qū)動蛋白廣泛參與各種腫瘤的發(fā)生,其表達(dá)水平與許多腫瘤的發(fā)生直接相關(guān)[23-25]。有研究顯示,在肝癌、精原細(xì)胞瘤、口腔鱗狀細(xì)胞癌、胰腺癌、前列腺癌及胃癌等組織中均存在KIF3B高表達(dá)[5-9,11]。在結(jié)直腸癌中過表達(dá)KIF3B可以逆轉(zhuǎn)LEF-AS1敲降引起的細(xì)胞增殖、遷移和侵襲抑制并促進(jìn)細(xì)胞的凋亡[10]。hsa_circ_0032462可以調(diào)節(jié)骨肉瘤細(xì)胞中KIF3B水平,而KIF3B可逆轉(zhuǎn)hsa_circ_0032462過表達(dá)誘導(dǎo)的骨肉瘤細(xì)胞增殖以及轉(zhuǎn)移[26]。然而,目前尚無敲降KIF3B影響TNBC細(xì)胞生物學(xué)特性和阿霉素化療敏感性的報道。

本文Transwell實(shí)驗(yàn)結(jié)果顯示,sh-KIF3B組細(xì)胞遷移和侵襲數(shù)量明顯減少,證明沉默MDA-MB-231細(xì)胞KIF3B基因可以下調(diào)細(xì)胞遷移和侵襲能力;MTT實(shí)驗(yàn)結(jié)果表明,沉默KIF3B基因后細(xì)胞增殖能力下降,且在相同濃度阿霉素處理下KIF3B沉默組細(xì)胞存活率較低,表明沉默KIF3B可以抑制細(xì)胞增殖,并提高細(xì)胞對阿霉素的敏感性;流式細(xì)胞術(shù)結(jié)果顯示,KIF3B基因沉默后,G0/G1期細(xì)胞比例顯著下降,而G2/M期細(xì)胞比例顯著升高,表明沉默KIF3B誘導(dǎo)了細(xì)胞周期阻滯。EMT是腫瘤發(fā)生發(fā)展過程中的重要現(xiàn)象,也是腫瘤細(xì)胞發(fā)生浸潤遷移和繼發(fā)性轉(zhuǎn)移的重要機(jī)制之一[27]。EMT在乳癌增殖和轉(zhuǎn)移中也有著重要意義[28]。本研究檢測了KIF3B基因沉默后EMT相關(guān)蛋白表達(dá)變化,結(jié)果顯示沉默KIF3B基因后MMP-2和MMP-9表達(dá)降低,而E-cadherin表達(dá)升高,差異有顯著性。表明沉默KIF3B可以通過EMT途徑調(diào)節(jié)TNBC細(xì)胞的遷移和侵襲。

綜上所述,沉默TNBC細(xì)胞中KIF3B基因可以抑制細(xì)胞遷移、侵襲和增殖能力,阻滯細(xì)胞周期,降低MMP-2和MMP-9表達(dá),提高E-cadherin表達(dá)。KIF3B基因沉默還可以與阿霉素協(xié)同作用,改善治療效果。因此,KIF3B有望成為新的TNBC治療靶點(diǎn)。

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(本文編輯 黃建鄉(xiāng))

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