沉默IQGAP1基因对小鼠胰腺祖细胞增殖的影响

更新时间:2023-06-08 03:03:40 阅读: 评论:0

基因组学与应用生物学,2020年,第39卷,第9期,第3961-3966页
研究报告
Rearch Report
沉默IQGAP1基因对小鼠胰腺祖细胞增殖的影响
李旭艳1,2,3*翟文君2马明君2李锐1付娜1文菁1
1岭南师范学院生命科学与技术学院,湛江,524000;2东北林业大学生命科学学院,哈尔滨,150040;3广东省特殊儿童发展与教育重点实验室,湛江,524000
*通信作者,*******************
摘要为探讨沉默IQ结构域三磷酸鸟苷合酶-激活蛋白1(IQ motif containing GTPa-activating protein1, IQGAP1)基因的表达对胰腺祖细胞增殖的影响,本研究将靶向IQGAP1基因的小干扰RNA(siRNA)转染胰腺祖细胞,qPCR、Western blotting验证IQGAP1基因表达的下调,通过细胞计数试剂盒8(cell counting kit-8, CCK8)法检测IQGAP1基因沉默对胰腺祖细胞增殖的影响,流式细胞术检测细胞周期进程,qPCR、Western blotting检测细胞周期蛋白D2(cyclin D2,CCND2)的表达水平。结果显示,干扰
片段有效沉默IQGAP1基因的表达,IQGAP1蛋白表达水平降低了(71.30±0.08)%;与对照组相比,沉默IQGAP1基因的表达使胰腺祖细胞增殖能力降低了(45.37±0.02)%,细胞周期阻滞在G0/G1期,CCND2基因表达水平明显降低。表明沉默IQGAP1基因可能通过抑制CCND2基因表达,抑制胰腺祖细胞的增殖。
关键词IQGAP1,胰腺祖细胞,RNA干扰,细胞增殖
Effects of IQGAP1Silencing on Proliferation of Pancreatic Progenitor Cells in Mou
Li Xuyan1,2,3*Zhai Wenjun2Ma Mingjun2Li Rui1Fu Na1Wen Jing1
1School of Life Science and Technology,Lingnan Normal University,Zhanjiang,524000;2College of Life Science,Northeast Forestry University, Harbin,150040;3Guangdong Provincial Key Laboratory of Development and Education for Special Needs Children,Zhanjiang,524000
*Corresponding author,*******************
DOI:10.13417/j.gab.039.003961
Abstract To investigate the effect of IQ motif containing GTPa-activating protein1(IQGAP1)silencin
g on the proliferation of pancreatic progenitor cells,the siRNA targeting IQGAP1gene was transfected into the pancreatic progenitor cells,and the knock-down of IQGAP1gene was detected by qPCR and Western blotting.The effect of IQGAP1silencing on the proliferation of pancreatic progenitor cells was analyzed by cell counting kit-8(CCK8) assay.The cell cycle process was detected by flow cytometry.The expression level of cyclin D2(CCND2)was deter-mined by qPCR and Western blotting.The results showed that the interference fragment targeting IQGAP1gene effecti-vely silenced the expression of IQGAP1,and the protein expression level of IQGAP1was decread by(71.30±0.08)%. Compared with the control group,silencing of IQGAP1decread the proliferation of cells by(45.37±0.02)%,arrested the cell cycle in G0/G1stage and decread the gene expression of CCND2.The results suggest that silencing of IQGAP1gene inhibits the proliferation of pancreatic progenitor cells by decreasing the expression of CCND2. Keywords IQGAP1,Pancreatic progenitor cells,RNA interference,Cell proliferation
基金项目:本研究由广东省教育厅特色创新项目(2018KTSCX127)、岭南师范学院科学研究人才专项(ZL2031)、国家自然科学基金(38101148)和广东省科技创新战略专项资金竞争性分配项目(2018A03011)共同资助
引用格式:Li X.Y.,Zhai W.J.,Ma M.J.,Li R.,Fu N.,and Wen J.,2020,Effects of IQGAP1silencing on pro
liferation of pancreatic progenitor cells in mou,Jiyinzuxue Yu Yingyong Shengwuxue(Genomics and Applied Biology),39(9):3961-3966(李旭艳,翟文君,马明君,李锐,付娜,文菁,2020,沉默IQGAP1基因对小鼠胰腺祖细胞增殖的影响,基因组学与应用生物学,39(9): 3961-3966)
基因组学与应用生物学联营体
胰岛β细胞受损或胰岛素功能抵抗会影响机体代谢,危害人类健康和生活质量,补充受损或功能异常胰岛β细胞是缓解糖尿病的理想途径。终末分化胰腺细胞起源于胚胎发育早期胰腺干细胞,有研究在成体胰腺中鉴定出具有自我更新和分化能力的胰腺祖细胞(Jin et al.,2013)。激活成体胰腺干/祖细胞增殖分化,获得终末分化胰腺内分泌细胞,是治疗胰腺疾病的新希望。然而,在正常及疾病状态下,胰腺祖细胞较难被激活。探究胰腺祖细胞增殖调控机制,有利于揭示其处于静息状态的分子机制。
IQ结构域三磷酸鸟苷合酶-激活蛋白1(IQ motif containing GTPa-activating protein1,IQGAP1)是IQ-GAPs(IQ motif-containing GTPa-activating proteins)蛋白家族成员,在人体大多数组织和器官中广泛表达(Wang et al.,2019)。IQGAP1包含钙调素同源结构域(calponin homology domain,CHD)、WW结构域、IQ 结构域、Ras-GTP酶活化蛋白相关结构域,作为支架蛋白与细胞外信号调节激酶1/2(extracellular signal-regulated kina1/2,ERK1/2)、磷脂酰肌醇3激酶(phosphatidylinositol3-kina,PI3K)、蓬乱蛋白2(di-shevelled2,Dvl2)、β-连环蛋白(β-catenin)、纤维形肌动蛋白(fibrous actin,
F-actin)等多种靶分子相互作用,调控细胞增殖、细胞粘附、细胞骨架、细胞迁移、细胞凋亡等生命活动(Mateer et al.,2004;Cui et al., 2017;Hu et al.,2019),对小鼠神经祖细胞、人胚胎干细胞、卵巢癌干细胞的分化、自我更新也具有调控作用(Balenci et al.,2007;Lee et al.,2010;Huang et al., 2015)。在胰腺细胞和疾病发生中,IQGAP1发挥重要功能,IQGAP1调控胰岛β细胞的细胞粘附力、胞吞和胞吐作用(Yan et al.,2009;Kimura et al.,2013;Kimura et al.,2019);IQGAP1基因在糖尿病并发症患者肾脏和脂肪细胞中表达丰度降低(Jufvas et al.,2016;Liu et al.,2019),而高表达于胰腺癌组织,促进胰腺癌细胞增殖、迁移和侵袭(Hu et al.,2019;Li et al.,2019),且与胰腺癌的恶性程度、淋巴结转移及预后不良有关(胡伟等,2017)。因此,推测IQGAP1可作为预防和治疗胰腺疾病的新靶点。
细胞周期蛋白D2(cyclinD2,CCND2)为细胞周期蛋白家族成员之一,在细胞有丝分裂过程中周期性地表达和降解,CCND2与细胞周期蛋白依赖性激酶(cyclin-dependent kina,CDK)4或6结合入核,并被激活,磷酸化视网膜细胞瘤基因(retinoblastoma, Rb)及其相关蛋白P107和P130,启动细胞DNA复制,调控细胞周期由G1期进入S期(Chiles,2004)。CCND2是磷酯酰肌醇3激酶/蛋白激酶B(phospha-tidylinositol3kina/protein kina B,PI3K/AKT)、丝裂原活化蛋白激酶/细胞外信号调节激酶(mitogen ac-tivated protein kina/extracellular signal regulated ki-na,MAPK/ERK)、Wnt(wingless and INT-1)等信号通路效应分子(Diao and chen,2007),其异常表达可能导致细胞增殖异常,与肿瘤、心肌肥大等疾病密切相关(周进等,2009)。
然而IQGAP1对胰腺祖细胞的功能调控作用尚未被清晰地揭示。本研究以小鼠胰腺祖细胞为研究对象,检测沉默IQGAP1基因表达对胰腺祖细胞增殖的影响,以期探究胰腺祖细胞增殖调控机制。
1结果与分析
1.1IQGAP1基因沉默的效果分析
用50nmol/L siIQGAP1或NC转染胰腺祖细胞72h后,提取RNA、蛋白,通过qPCR、Western blot-ting检测IQGAP1基因的沉默效果。结果显示,与对照组相比,实验组胰腺祖细胞IQGAP1基因mRNA 水平表达降低了(53.81±0.86)%(图1),IQGAP1蛋白表达水平降低了(71.30±8.30)%(图2A;图2B),干扰片段成功抑制IQGAP1基因表达。
1.2沉默IQGAP1基因对胰腺祖细胞增殖的抑制作用
细胞转染48h后,CCK8法检测细胞增殖,结果显示沉默IQGAP1基因表达使细胞吸光值由0.69±0.01下降到0.38±0.02,实验组胰腺祖细胞增殖能力降低了(45.3±72.91)%(图3)。流式细胞术检测显示,沉默IQGAP1基因使胰腺祖细胞细胞周期阻滞在G0/G1期(图4)
图1qPCR检测siIQGAP1干扰片段对IQGAP1mRNA表达的影响
注:**:与转染NC细胞相比,差异极显著(p<0.01)
Figure1The effect of siRNA targeting IQGAP1on the mRNA expression of IQGAP1was detected by qPCR
Note:**:The difference was highly significant compared with cells transfected with NC(p<0.01)
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沉默IQGAP1基因对小鼠胰腺祖细胞增殖的影响1.3沉默IQGAP1基因对CCND2基因表达的影响
细胞转染72h ,由qPCR 、Western blotting 检测
结果可见,转染siIQGAP1干扰片段胰腺祖细胞的
CCND2基因mRNA 表达水平降低了(53.58±0.17)%(图5),蛋白表达水平降低了(68.15±2.87)%(图6A;6B),沉默IQGAP1显著抑制CCND2基因表达(p <0.01)。
2讨论
激活内源胰腺干/祖细胞,获得分泌胰岛素的细胞,将是一种更为有效和安全的糖尿病干细胞治疗方案,然而成体胰腺干/祖细胞数量少,且常处于静息状态,因此,探究胰腺干/祖细胞的增殖机制具有重要的科学意义。研究表明,IQGAP1基因在不同类型的细胞和组织中广泛表达,具有调控细胞生长、迁移、分化等功能(Abel et al.,2015)。本研究利用RNAi 技术成功沉默胰腺祖细胞IQGAP1基因表达,抑制
图2Western blotting 检测siIQGAP1干扰片段对IQGAP1蛋白表达的影响
注:A:蛋白印记;B:蛋白表达定量统计;**:与转染NC 细胞相比,差异极显著(p <0.01)
Figure 2The effect of siRNA targeting IQGAP1on the protein expression of IQGAP1was detected by
Western blotting Note:A:Western blotting;B:Quantitative statistics of protein ex-pression;**:The difference was highly significant compared with cells transfected with NC (p <
虎骨手串
0.01)
图3CCK8法检测沉默IQGAP1对胰腺祖细胞增殖的影响注:**:与转染NC 细胞相比,差异极显著(p <0.01)
Figure 3The effect of IQGAP1silencing on the proliferation of pancreatic progenitor cells was detected by CCK8assay Note:**:The difference was highly significant compared with cells transfected with NC (p <
拉小提琴的女孩0.01)
图4流式细胞术检测沉默IQGAP1对胰腺祖细胞细胞周期进程的影响
注:**:与转染NC 细胞相比,差异极显著(p <0.01)
Figure 4The effects of IQGAP1silencing on the cell cycle distri-bution of pancreatic progenitor cells were analyzed by flow cy-tometry
Note:**:The difference was highly significant compared with cells transfected with NC (p <
0.01)
图6Western blotting 检测沉默IQGAP1对CCND2蛋白表达
的影响
注:A:蛋白印记;B:蛋白表达定量统计;**:与转染NC 细胞相比,差异极显著(p <0.01)
Figure 6The effect of IQGAP1silencing on the protein expres-sion of CCND2was detected by Western blotting
Note:A:Western blotting;B:Quantitative statistics of protein ex-pression;**:The difference was highly significant compared with cells transfected with NC (p <0.01)
图5qPCR 检测沉默IQGAP1对CCND2基因mRNA 表达的影响
注:**:与转染NC 细胞相比,差异极显著(p <0.01)
Figure 5The effect of IQGAP1silencing on the mRNA expres-sion of CCND2was detected by qPCR
Note:**:The difference was highly significant compared with cells transfected with NC (p <
0.01)
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基因组学与应用生物学
腺祖细胞增殖,将细胞周期阻滞在G0/G1期。
IQGAP1作为支架蛋白,与多种蛋白分子相互作用,形成不同蛋白复合物调控细胞生命活动。IQGAP1
的钙调素同源结构域CHD与F-actin形成复合物,调节细胞骨架,促进肌动蛋白聚合,进而调控细胞分裂、迁移和粘附(Mateer et al.,2004)。IQGAP1结合Kirsten大鼠肉瘤病毒癌基因同源物(Kirsten rat sarco-ma viral oncogene homolog,K-Ras)、B-Raf原癌基因丝氨酸/苏氨酸蛋白激酶(B-Raf proto-oncogene,rine/ threonine kina,BRAF)、丝裂原活化的细胞外信号调节激酶(mitogen-activated extracellular signal-regulated kina,MEK)和ERK形成信号转导复合物,调控MAPK信号通路,促进ERK激活,影响不同组织细胞的生理活动(Mcnulty et al.,2011)。IQGAP1与Ca2+/钙调蛋白、细胞分裂周期蛋白42(cell division cycle 42,Cdc42)、Rac1GTP结合蛋白(Rac family small GT-Pa1,Rac1)、PI3K形成复合物,调控雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)、丝氨酸/苏氨酸蛋白激酶(rine/threonine kina1,AKT1)活性,调节细胞生长和存活(Ren et al.,2008;Wei et al., 2020)。在Capan-1和PANC-1胰腺癌细胞中,敲减IQGAP1可降低MAPK信号通路活性,抑制细胞增殖(Li et al.,2019)。在SW1990和CFPAC-1胰腺癌细胞中,IQGAP1促进Dvl2蛋白表达,并与Dvl2和β-catenin形成复合物,增强β-catenin转录活性和入核,增强经典的Wnt信号转导通路,上调靶基因Cyclin D1和C-myc表达,促进肿瘤细胞增殖、迁移和侵袭,并促进小鼠肿瘤生长和转移(Hu et al.,2019)。
IQGAP1在干细胞中发挥重要功能,调控神经祖细胞、胚胎干细胞、癌症干细胞的迁移、自我更新、分化等功能(Balenci et al.,2007;Lee et al.,2010;Huang et al.,2015)。IQGAP1与Cdc42、Ras相关的C3肉毒素底物1(ras-related C3botulinum toxin substrate1, Rac1)、无脑回的致病基因(lisncephaly-
1,Lis1)形成复合物,促进小鼠神经祖细胞迁移和分化(Balenci et al.,2007)。人胚胎干细胞中,IQGAP1和锌指转录因子Slug调控细胞骨架重排和细胞分裂,miR-124a 通过抑制IQGAP1维持胚胎干细胞的干性(Lee et al., 2010)。IQGAP1增强上皮性卵巢癌干细胞样细胞分化过程中的细胞侵袭行为,其可能参与卵巢癌的转移(Huang et al.,2015)。在本研究中,胰腺祖细胞中沉默IQGAP1基因,降低CCND2基因表达,表明IQGAP1基因通过调控细胞周期蛋白CCND2的表达调控胰腺祖细胞增殖。
研究表明,表皮生长因子(epidermal growth factor, EGF)是胚胎、成体胰腺祖细胞维持体外增殖、自我更新、分化的必需因子,培养液缺乏EGF,使胰腺祖细胞增殖速度减慢(Wedeken et al.,2017)。EGF与表皮生长因子受体(epidermal growth factor receptor,EGFR)结合,使受体磷酸化,激活EGFR信号通路,增强细胞增殖、存活信号通路活性,主要有PI3K/AKT、MAPK/ ERK、Janus激酶/信号转导和转录激活因子3(Janus kina/signal transducer and activator of transcription 3,JAK/STAT3)信号通路。Mcnulty等(2011)发现,IQGAP1作为一种分子支架调节EGFR的激活,当EGF激活EGFR受体,能够催化IQGAP1丝氨酸(Ser1443)磷酸化,IQGAP1丝氨酸磷酸化通过正反馈机制调控EGFR信号活性,增强EGFR酪氨酸磷酸化,进而调控下游信号分子,IQGAP1在EGF激活EGFR受体过程起到重要调节。本研究沉默IQ-GAP1基因表达抑制胰腺祖细胞增殖,与已发表培养液缺乏EGF对胰腺祖细胞增殖影响结果相同,IQGAP1可能阻断了EGFR信号通路传导作用,影响细胞增殖。
本研究在细胞水平揭示了IQGAP1可能通过抑制细胞周期蛋白CCND2表达抑制胰腺祖细胞增殖,为胰
腺祖细胞增殖分化的研究提供数据,为胰腺疾病预防治疗提供参考。
3材料与方法
3.1材料来源
小鼠成体胰腺祖细胞由东北林业大学发育生物学实验室提供(Zhang et al.,2011)。
靶向IQGAP1的小干扰RNA(small interfering RNA,siRNA)(siIQGAP1)序列参照Sharma和Hen derson(2007)发表的序列,siIQGAP1和对照siRNA (negative control,NC)由吉玛基因股份有限公司合成,序列如下:siIQGAP1-n(CGACAUGAUGAU GAUAAACAA)、siIQGAP1-antin(UGUUUAUCA UCAUCAUGUCG)、NC-n(UUCUCCGAACGUG UCACGUTT)、NC-antin(ACGUGACACGUUCG GAGAATT)。
B27细胞培养添加剂(B27supplement,B27)和胎牛血清(fetal bovine rum,FBS)购自Gibco公司;DMEM/F12培养液、胰蛋白酶、双抗和L谷氨酰胺购自Hyclone公司;细胞培养级重组人胰岛素、表皮细胞生长因子购自BD公司(Becton,Dickinson and
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Company);细胞转染脂质体Lipofectamine RNAiMAX 购自Invitrogen公司;Cell counting kit-8(CCK8)试剂盒购自Dojindo Labratories;蛋白裂解液和蛋白浓度测定试剂盒购自碧云天生物技术研究所;IQGAP1抗体(cat.#610095)购自BD公司;CCND2抗体(cst.3741)购自Cell Signaling Technology公司;β-肌动蛋白(β-actin)抗体(HC201-02)、辣根过氧化物酶标记的Ⅱ抗(HS201-01,HS101-01)、反转录试剂盒购自北京全式金生物技术有限公司;实时定量PCR检测试剂盒购自Roche公司;β-巯基乙醇、过硫酸铵、丙烯酰胺、甲基双丙烯酰胺和四甲基乙二胺购自Sigma公司;吐温20和甲醇等常规生化试剂购自天津天大化学试剂厂。
3.2细胞培养
传代胰腺祖细胞用10%贴壁培养液过夜培养,次日早更换2%生长培养液,置于37℃、5.0%CO2饱和湿度的培养箱中培养,每3d更换生长培养液。贴壁培养液成分:含10%FBS、1%双抗、1%L谷氨酰胺的DMEM/F12培养液。生长培养液成分:含2%FBS 和B27、1%L谷氨酰胺、20ng/mL EGF、10μg/mL重组人胰岛素、50μmol/Lβ-巯基乙醇、1%双抗的DMEM/F12培养液。
3.3细胞转染
第8代胰腺祖细胞生长至对数生长期接种细胞培养板,生长培养液培养24h后,细胞40%汇合,每孔转染50nmol/L siIQGAP1或NC,细胞转染参照Lipofectamine RNAiMAX说明书操作。对照组和实验组均
设3个复孔。
3.4CCK8检测细胞增殖
胰腺祖细胞接种96孔板,生长至40%汇合,转染siIQGAP1或NC48h,弃去培养液,PBS洗涤细胞,补加110μL含有10%CCK8的DMEM/F12培养液,置于37℃培养箱中培养2h,通过酶标仪读取各孔吸光值。对照组和实验组均设3个复孔。
3.5流式细胞术检测细胞周期分布
细胞转染48h,收集细胞1×106个,PBS洗涤,离心收集细胞,70%冷乙醇固定细胞2h,PBS洗涤,50μg/mL含RNA A的PI溶液避光孵育30min,冷PBS洗涤,600μL PBS重悬细胞,Accuri C6流式细胞仪检测,随机收集30000个细胞,采集信号,分析数据。3.6qPCR检测基因mRNA表达
细胞转染48h,提取细胞总RNA,利用随机引物反转录,获得cDNA,实时定量PCR检测基因mRNA表达,所得数据通过2-ΔΔCt方法计算,β-actin 基因作为内参基因,设置3个重复。
3.7Western blotting检测蛋白表达
细胞转染72h,PBS洗涤,RIPA裂解细胞,再10000g离心10min,取上清,测定蛋白浓度。样品进行
SDS-PAGE凝胶电泳,转膜,37℃封闭1h,与抗β-actin、IQGAP1和CCND2抗体于4℃孵育12h,TBST洗膜3次,每次10min,辣根过氧化物酶标记二抗,室温孵育1h,天能5200发光成像采集系统采集图像,β-actin作为内参照。
3.8统计学分析安全座椅怎么安装
用GraphPad Prism7软件进行统计学处理,数据采用平均数±标准误(x±s)表示,组间比较采用独立样本t检验,p<0.01表示差异极显著,实验重复3次。
电脑手写板作者贡献
李旭艳负责实验设计执行、论文撰写;翟文君、马明军完成Western blotting操作;付娜负责细胞培养;李锐、文菁负责数据分析和修改论文。全体作者都已阅读并同意最终的文本。
致谢
千古英雄本研究由广东省教育厅特色创新项目(2018K-TSCX127)、岭南师范学院科学研究人才专项(ZL2-031)、国家自然科学基金(38101148)和广东省科技创新战略专项资金竞争性分配项目(2018A03011)共同资助。
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