CN114306573A - 一种可促进成骨的受体qsox1的应用 - Google Patents
一种可促进成骨的受体qsox1的应用 Download PDFInfo
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- CN114306573A CN114306573A CN202111597966.4A CN202111597966A CN114306573A CN 114306573 A CN114306573 A CN 114306573A CN 202111597966 A CN202111597966 A CN 202111597966A CN 114306573 A CN114306573 A CN 114306573A
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Abstract
本发明涉及一种可促进成骨的受体QSOX1的应用,本发明经过实验论证,QSOX1可作为受体与分泌型DDRGK1结合,发挥治疗骨折或骨缺损的作用,为骨相关疾病的治疗打开了新的思路并拓展了受体调控在临床的进一步应用。
Description
技术领域
本发明属于骨相关疾病领域,特别涉及一种可促进成骨的受体QSOX1的应用。
背景技术
目前对于骨相关疾病的治疗多以手术治疗为主,但是手术的创伤过大常导致骨折的延迟愈合以及不愈合,对于这种情况常缺乏有效的促进成骨方案。不仅如此,对于骨质疏松,往往仅能通过药物对于破骨进行抑制,而缺乏促进成骨进而提升骨量的防治手段。
DDRGK1被认为是参与类泛素化过程的重要蛋白。其参与内质网应激导致的细胞凋亡 [Wu J,Lei G,Mei M,et al.A novel C53/LZAP-interacting protein regulatesstability of C53/LZAP and DDRGK domain-containing Protein 1(DDRGK1)andmodulates NF-kappaB signaling.The Journal of biological chemistry 2010;285:15126-36]。同时DDRGK1(118-216)与ASC1相互结合,在类泛素化系统蛋白相互作用下,实现ASC1的类泛素化,介导雌激素受体α(ERα)激活后的信号转录[Yoo HM, Kang SH,Kim JY,etal.Modification of ASC1 by UFM1 is crucial for ERalpha transactivation andbreast cancer development.Molecular cell 2014;56:261-74]。
QSOX1是可催化二硫键形成的蛋白,在成纤维细胞中可被分泌,在细胞外催化二硫键形成,稳定细胞外基质的网络[Ilani T,Alon A,Grossman I,et al.A secreteddisulfide catalyst controls extracellular matrix composition andfunction.Science.2013Jul 5;341(6141):74-6.]。而在肿瘤细胞中,敲除或者敲减QSOX1可大大增强肿瘤细胞的迁徙及侵袭能力[Sun J,Zhou C,Zhao Y,et al.Quiescinsulfhydryl oxidase 1promotes sorafenib-induced ferroptosis in hepatocellularcarcinoma by driving EGFR endosomal trafficking and inhibiting NRF2activation.Redox biology.2021May;41:101942.]。但至今无人关注QSOX1在成骨方向的应用。
发明内容
本发明所要解决的技术问题是提供一种可促进成骨的受体QSOX1的应用,经过实验论证,QSOX1可作为受体与分泌型DDRGK1结合,发挥治疗骨折或骨缺损的作用,为骨相关疾病的治疗打开了新的思路并拓展了受体调控在临床的进一步应用。
本发明提供了一种可促进成骨的受体QSOX1的应用,应用于制备促进骨折愈合、改善骨质疏松疾病的药物。
所述受体QSOX1的蛋白序列如SEQ NO.1所示。
所述受体QSOX1与分泌型DDRGK1蛋白结合,促进骨髓间充质干细胞的成骨能力。
所述受体QSOX1与分泌型DDRGK1蛋白应用于制备治疗骨折或骨缺损的药物。
以所述受体QSOX1为活性成分,配以药学上可接受的辅料或辅助性成分制备成制剂使用。
优选的,所述制剂选自注射液、皮下埋植剂、片剂、粉剂、颗粒剂、胶囊、口服液、缓释剂中的一种。
有益效果
本发明经过实验论证,QSOX1在MC3T3-E1细胞系中可作为膜上受体存在,同时,其可与分泌型DDRGK1蛋白结合,促进骨髓间充质干细胞的成骨能力并为未来的临床转化进一步构建实验基础,为骨相关疾病的治疗打开了新的思路并拓展了受体调控在临床的进一步应用。
附图说明
图1为QSOX1蛋白受体示意图。
图2为DDRGK1纯化表达图。
图3为可促进成骨的受体QSOX1可与分泌型DDRGK1蛋白结合的蛋白免疫印迹图(左);以及DDRGK1类泛素化修饰QSOX1的蛋白免疫印迹图(右)。
图4为可促进成骨的受体QSOX1可与分泌型DDRGK1蛋白共定位的免疫荧光图。
图5为不同表达水平的受体QSOX1可与分泌型DDRGK1蛋白结合并刺激小鼠MC3T3-E1细胞系成骨分化的第7天ALP染色(左)及第21天茜素红染色(右)图:QOEC:QSOX1过表达对照组;QOEC+D:QSOX1过表达对照组加入分泌型DDRGK1蛋白;QOE:QSOX1 过表达组;QOE+D:QSOX1过表达组加入分泌型DDRGK1蛋白。
图6为不同表达水平的受体QSOX1对小鼠MC3T3-E1细胞系成骨标志mRNA的PCR检测图。
具体实施方式
下面结合具体实施例,进一步阐述本发明。应理解,这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解,在阅读了本发明讲授的内容之后,本领域技术人员可以对本发明作各种改动或修改,这些等价形式同样落于本申请所附权利要求书所限定的范围。
实施例1
(1)实验方法
①重组表达载体的构建和目的蛋白的表达
人源QSOX1基因(NCBI参考序列:NM_001004128.3)由金唯智生物公司经密码子优化后合成。如图1所示,PCR获得了人源QSOX11 cDNA片段(对应蛋白序列MRRCNSGSGPPPSLLLLLLWLLAVPGANAAPRSALYSPSDPLTLLQADTVRGAVLGSRSAWA VEFFASWCGHCIAFAPTWKALAEDVKAWRPALYLAALDCAEETNSAVCRDFNIPGFPTVRF FKAFTKNGSGAVFPVAGADVQTLRERLIDALESHHDTWPPACPPLEPAKLEEIDGFFARNNE EYLALIFEKGGSYLGREVALDLSQHKGVAVRRVLNTEANVVRKFGVTDFPSCYLLFRNGSV SRVPVLMESRSFYTAYLQRLSGLTREAAQTTVAPTTANKIAPTVWKLADRSKIYMADLESA LHYILRIEVGRFPVLEGQRLVALKKFVAVLAKYFPGRPLVQNFLHSVNEWLKRQKRNKIPYS FFKTALDDRKEGAVLAKKVNWIGCQGSEPHFRGFPCSLWVLFHFLTVQAARQNVDHSQEA AKAKEVLPAIRGYVHYFFGCRDCASHFEQMAAASMHRVGSPNAAVLWLWSSHNRVNARL AGAPSEDPQFPKVQWPPRELCSACHNERLDVPVWDVEATLNFLKAHFSPSNIILDFPAAGSA ARRDVQNVAAAPELAMGALELESRNSTLDPGKPEMMKSPTNTTPHVPAEGPEASRPPKLHP GLRAAPGQEPPEHMAELQRNEQEQPLGQWHLSKRDTGAALLAESRAEKNRLWGPLEVRR VGRSSKQLVDIPEGQLEARAGRGRGQWLQVLGGGFSYLDISLCVGLYSLSFMGLLAMYTY FQAKIRALKGHAGHPAA),该片段经AscI/NotI双酶切后克隆到实验室改造的pCDNA3.4质粒上,基因序列N端连接出膜信号肽MKTIIALSYIFCLVFA,C端连接TEV酶切位点 ENLYFQG和纯化标签HHHHHHHH。
Expi293F细胞于37℃,110rpm,5%CO2的条件下进行悬浮培养,当细胞数达到每毫升 2.5×106密度后进行转染。使用1mg表达质粒DNA转染1L细胞,其中表达质粒和转染试剂PEI MAX以1:3的比例(w/w)在100ml新鲜培养基中预混合,孵育30分钟后全部加入 1LExpi293F细胞中继续保持原条件进行悬浮培养,在转染72小时后收集细胞培养物上清液进行蛋白纯化。
②蛋白纯化
对所述细胞培养物以1500g转速离心10分钟并收集上清液,然后将所得上清液以5000g 转速再次离心20分钟并收集上清。取2mL Ni Smart Beads 6FF纯化介质装入纯化空柱,首先用约20个柱体积的去离子水清洗该纯化介质,然后用约20个柱体积的缓冲液(20mMHepes pH 8.0,150mM NaCl,10%Glycerol)对该纯化介质进行预平衡。此后,以约0.5ml/min的流速将上清液加载至预平衡的纯化介质。待上清液全部穿流完毕以后,用约20个柱体积的缓冲液洗涤该纯化介质。最后,使用约3个柱体积的缓冲液将介质重悬至离心管中,并向其中加入约0.4mg的TEV蛋白酶,置于旋转摇床上进行4℃过夜酶切处理。
将所述离心管中过夜酶切的样品重新加载至空的纯化柱容器中并收集该酶切处理后的穿流液,然后用约2个柱体积的缓冲液分两份缓慢流过纯化介质并采集穿流液,最后合并全部穿流液。将合并后的穿流液浓缩至1ml并将样品经SPINX离心过滤器过滤,然后用分子排阻层析柱(Superdex 200Increase 10/300GL,GE Healthcare)进行进一步分离纯化,如图2所示。分子排阻层析柱预先装于4℃下的AKTA PURE仪器上并使用20mM Hepes pH8.0,150mM NaCl作为流动相进行预平衡。经SDS-PAGE检验蛋白纯度后,收集包含DDRGK1蛋白的级分(fplc对应的蛋白出峰位置)进行后续实验。
③蛋白免疫共沉淀法
使用PBS清洗control,HA-QSOX1过表达和Flag-DDRGK1过表达293T工具细胞3遍,每皿细胞中加入1.2mlNETT细胞裂解液(Beyotime,Shanghai,China),已经预加入12ul的蛋白酶抑制剂,蛋白磷酸酶抑制剂A+B及PMSF(Roche,Grenzach,Germany)裂解细胞形成蛋白匀浆。取200ul蛋白上清加入50ul蛋白loading-buffer(5X)以99摄氏度的温度烈煮10min,取剩余的1000μl蛋白上清加入30μl Flag磁珠(Sigma-Aldrich,St Louis,MO,U.S.A),放于4℃摇床过夜。第二天以磁铁吸附磁珠后去上清,使用加入蛋白酶抑制剂,蛋白磷酸酶抑制剂A+B 及PMSF(Roche,Grenzach,Germany)的TBS清洗磁珠3遍,加入40μl 1X loadingBUFFER 99 摄氏度高温烈煮磁珠5分钟,磁铁吸附磁珠后取上清点样,与Input组用10%或12.5%的 SDS-PAGE凝胶对提取的蛋白质进行等量(20-30μg)分离,并用0.22μm PVDF膜(Merck Millipore)电印迹分离蛋白质。在室温下用5%BSA-PBS封闭膜1小时,然后在4℃下与一级抗体(在5%BSA-PBS中稀释1:1000)孵育过夜(至少16小时)。抗Flag(CST;兔单克隆抗体),HA(CST;兔单克隆抗体),QSOX1(PROTEINTECH;兔mAb),DDRGK1 (PROTEINTECH;兔mAb),Myc(CST;兔mAb)和β-肌动蛋白(CST;兔单克隆抗体)。然后在Tris缓冲盐水-Tween20(TBST)中广泛冲洗膜,随后用抗兔IgG(H+L)及抗鼠IgG (H+L)(DyLight)培养TM8004×PEG结合物;细胞信号技术)二级抗体(1:5000稀释度) 室温下黑暗1小时。再次在TBST中广泛冲洗膜,并在LI-COR Odyssey荧光成像系统(美国东北林肯市LI-COR Biosciences)上检测到蛋白质免疫反应性。蛋白质免疫反应谱带强度的半定量分析采用imageproplus6.0软件测量,内参为β-actin。
④成骨分化
使用小鼠MC3T3-E1细胞系成骨诱导分化培养基试剂盒(Cyagen),按照试剂盒要求小鼠 MC3T3-E1细胞系成骨诱导分化培养基。培养孔板表面包被0.1%明胶,小鼠MC3T3-E1细胞系按照2×104cells/cm2接种于孔板中,加入成骨诱导分化完全培养基,同时给予不同浓度重组人分泌型DDRGK1。每隔3天换用新鲜的成骨诱导分化完全培养基换液。诱导7天后,ALP 染色。诱导21天后,进行阿尔新蓝染色。
⑤免疫荧光法
免疫荧光检测时,将MC3T3-E1细胞培养在共聚焦小皿上并用4%的PFA固定,然后在 37℃的抗原回收缓冲液(Roche)中孵育30分钟。冷却至室温后,将载玻片浸入PBS(pH7.4) 中,洗涤3次,每次5分钟。在切片中加入自荧光猝灭剂5min,室温下用阻断缓冲液阻断30min。随后在4℃的湿箱中用一级抗体孵育切片过夜。一级抗体以1:100稀释使用,包括抗 QSOX1(PROTEINTECH;兔mAb),DDRGK1(PROTEINTECH;兔mAb)。第二天,用 PBS冲洗切片,然后用Alexa-fluor594结合二级抗体(抗兔,1:500;细胞信号技术)在室温下黑暗中孵育50分钟。切片用PBS洗涤,然后用DAPI溶液(美国密苏里州圣路易斯市 Sigma-Aldrich)在黑暗中孵育10分钟以染色细胞核。切片进行最终PBS洗涤,风干,然后用抗荧光猝灭片密封。数字荧光图像是在徕卡DM4000 B表观荧光显微镜(Leica Microsystems)下拍摄。
⑥qPCR检测法
使用小鼠MC3T3-E1细胞系成骨诱导分化培养基培养MC3T3-E1 QSOX1对照组及过表达组细胞系。培养孔板表面包被0.1%明胶,小鼠MC3T3-E1细胞系按照2×104cells/cm2接种于孔板中,加入成骨诱导分化完全培养基,同时给予重组人分泌型DDRGK1。每隔3天换用新鲜的成骨诱导分化完全培养基换液。诱导7天后,根据说明书说明,使用TRIzol试剂(Thermo Fisher Scientific,Waltham,MA,USA)从组织和细胞中分离总RNA。利用cDNA合成试剂盒(Takara Bio,Otsu,Japan)从提取的rna中反转录第一链互补dna(cDNA)。采用GoTaq一步法RT-qPCR系统(美国威斯康星州麦迪逊市普罗梅加)和琼脂糖凝胶电泳(美国加利福尼亚州赫拉克勒斯Bio-Rad Laboratories)检测相对mRNA表达。使用TB绿色预混料Ex-Taq试剂盒(Takara Bio)在Applied Biosystems QuantStudio 6Flex实时PCR系统(ThermoFisher Scientific)上进行实时qPCR。使用NCBI BLAST和表2中提供的序列设计特定引物对。以 GAPDH或β-actin基因表达作为内对照。靶基因表达水平用2-ΔCT法测定。将实验组靶基因的平均CT值归一化为GAPDH或β-actin的CT值,得到ΔCT值。然后将其进一步标准化以获得ΔΔCT。
(2)实验结果
①可促进成骨的受体QSOX1可与分泌型DDRGK1蛋白结合
图3左显示,HA-QSOX1可与Flag-DDRGK1结合(第3泳道)。图3右显示,Flag-DDRGK1可对QSOX1进行类泛素化修饰,这种修饰与DDRGK1的表达水平有关(第2,3泳道)。
②可促进成骨的受体QSOX1可与分泌型DDRGK1在内质网膜上共定位
由图4可知,受体QSOX1与分泌型DDRGK1均在内质网膜上表达并定位,并且两者在内质网周围结合,发挥相应成骨促进作用。
③可促进成骨的受体QSOX1对小鼠MC3T3-E1细胞系成骨分化的作用
由图5左图可知,可促进成骨的受体QSOX1过表达组ALP染色较对照组显著增加,并且加入分泌型DDRGK1蛋白与可促进成骨的受体QSOX1结合时,ALP染色增加更明显。由图5右图可知,可促进成骨的受体QSOX1过表达组AR染色较对照组显著增加,并且加入分泌型DDRGK1蛋白与可促进成骨的受体QSOX1结合时,AR染色增加更明显。
由此说明,受体QSOX1可促进小鼠MC3T3-E1细胞系成骨分化。
④可促进成骨的受体QSOX1对小鼠MC3T3-E1细胞系成骨标志mRNA的PCR检测
可促进成骨的受体QSOX1过表达作用小鼠MC3T3-E1的0,3,5天PCR,由图6可知:刺激至第3,5天,受体QSOX1过表达的细胞系ALPL,Col1a1,RUNX2,OCN,OPN,Osterix基因表达水平出现明显差异;由此说明,受体QSOX1过表达可改变小鼠MC3T3-E1细胞系成骨分化标志mRNA的表达。
序列表
<110> 上海交通大学医学院附属第九人民医院
<120> 一种可促进成骨的受体QSOX1的应用
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Claims (6)
1.一种可促进成骨的受体QSOX1的应用,其特征在于:应用于制备促进骨折愈合、改善骨质疏松疾病的药物。
2.根据权利要求1所述的应用,其特征在于:所述受体QSOX1的蛋白序列如SEQ NO.1所示。
3.根据权利要求1所述的应用,其特征在于:所述受体QSOX1与分泌型DDRGK1蛋白结合,促进骨髓间充质干细胞的成骨能力。
4.根据权利要求3所述的应用,其特征在于:所述受体QSOX1与分泌型DDRGK1蛋白应用于制备治疗骨折或骨缺损的药物。
5.根据权利要求1所述的应用,其特征在于:以所述受体QSOX1为活性成分,配以药学上可接受的辅料或辅助性成分制备成制剂使用。
6.根据权利要求5所述的应用,其特征在于:所述制剂选自注射液、皮下埋植剂、片剂、粉剂、颗粒剂、胶囊、口服液、缓释剂中的一种。
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