CN105586310B - Il-31在调控间充质干细胞增殖和分化中的应用 - Google Patents
Il-31在调控间充质干细胞增殖和分化中的应用 Download PDFInfo
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Abstract
本发明公开IL‑31在调控间充质干细胞增殖和分化中的应用。本发明是基于本发明发明人首次发现细胞因子IL‑31能促进MSCs的自我更新和多向分化潜能得到的成果。本发明通过基因工程的方法构建了IL‑31、shIL‑31、Oct4和shOct4的表达载体,通过慢病毒分别转染到MSCs中,发现IL‑31和作为阳性对照的Oct4能促进MSCs的增殖和多向分化潜能,而shIL‑31和作为阳性对照的shOct4抑制MSCs的增殖和多向分化潜能。因此,这些研究结果将为研究IL‑31在MSCs自我更新和多向分化潜能中的调控机理提供理论基础,为将MSCs用于细胞治疗奠定必要基础。
Description
技术领域
本发明涉及再生医学及基因工程领域,具体涉及IL-31在调控间充质干细胞增殖和分化中的应用。
背景技术
间充质干细胞(Mesenchymal stem cells,MSCs)最早由Pittenger等分离于骨髓,后来在脐带和脂肪等组织中也能分离得到。MSCs具有如下优点:MSCs可塑性很高,在体内外诱导条件下能分化成软骨、骨、肌肉、肌腱、韧带和脂肪等组织;MSCs具有归巢能力,可以在生物体内向受损和炎症部位集中;MSCs能诱导或增加新血管的形成;MSCs缺乏显著的免疫原性,防止自身免疫;另外MSCs分离方便。近几年来,再生医学快速发展,由于胚胎干细胞用于细胞治疗受伦理道德的影响,并且有致癌的风险,所以MSCs取代胚胎干细胞用于细胞治疗已经成为一种趋势。但MSCs在再生医学和组织工程应用中也存在缺陷,例如:随着细胞传代次数的增加,MSCs的形态发生变化,增殖能力和多向分化潜能等都逐渐下降。如何提高MSCs的增殖能力和多向分化潜能已经成为急需解决的难题,解决这些问题将对MSCs应用于再生医学和组织工程产生重大影响。最近的研究发现,多能性基因Oct4,Sox2和Nanog等对MSCs的增殖和多向分化潜能起促进作用,抑制这些基因的表达能对MSCs增殖和多向分化潜能产生抑制作用。通过基因工程的手段提高MSCs增殖和多向分化潜能已经成为研究的热点。
发明内容
本发明的目的在于克服现有技术的缺点与不足,提供IL-31在调控间充质干细胞增殖和分化中的应用。
本发明的目的通过下述技术方案实现:IL-31在调控间充质干细胞增殖和分化中的应用,基于本发明发明人首次发现转染IL-31能促进MSCs的增殖和成脂或成骨分化潜能。
所述的IL-31的氨基酸序列如下所示:
MASHSGPSTSVLFLFCCLGGWLASHTLPVRLLRPSDDVQKIVEELQSLSKMLLKDVEEEKGVLVSQNYTLPCLSPDAQPPNNIHSPAIRAYLKTIRQLDNKSVIDEIIEHLDKLIFQDAPETNISVPTDTHECKRFILTISQQFSECMDLALKSLTSGAQQATT。
所述的IL-31的编码核苷酸序列如下所示:
ATGGCCTCTCACTCAGGCCCCTCGACGTCTGTGCTCTTTCTGTTCTGCTGCCTGGGAGGCTGGCTGGCCTCCCACACGTTGCCCGTCCGTTTACTACGACCAAGTGATGATGTACAGAAAATAGTCGAGGAATTACAGTCCCTCTCGAAGATGCTTTTGAAAGATGTGGAGGAAGAGAAGGGCGTGCTCGTGTCCCAGAATTACACGCTGCCGTGTCTCAGCCCTGACGCCCAGCCGCCAAACAACATCCACAGCCCAGCCATCCGGGCATATCTCAAGACAATCAGACAGCTAGACAACAAATCTGTTATTGATGAGATCATAGAGCACCTCGACAAACTCATATTTCAAGATGCACCAGAAACAAACATTTCTGTGCCAACAGACACCCATGAATGTAAACGCTTCATCCTGACTATTTCTCAACAGTTTTCAGAGTGCATGGACCTCGCACTAAAATCATTGACCTCTGGAGCCCAACAGGCCACCACTTAA。
所述的调控为正调控,即促进作用。
所述的IL-31在调控间充质干细胞增殖和分化中的应用,是将IL-31蛋白或能表达IL-31的核酸序列制备为促进间充质干细胞增殖和分化的制剂。
所述的核酸序列优选为DNA序列。
所述的IL-31在调控间充质干细胞增殖和分化中的应用,是以IL-31基因为靶位点,将能促进IL-31基因转录和表达的物质制备为促进间充质干细胞增殖和分化的制剂。
所述的物质优选为Oct4转录因子。
本发明相对于现有技术具有如下的优点及效果:本发明是基于本发明发明人首次发现转染IL-31能促进MSCs的增殖和成脂或成骨分化潜能得到的成果。本发明将含有IL-31、shIL-31、Oct4、shOct4和空质粒的慢病毒分别转染至MSCs中进行表达,发现转染Oct4或IL-31质粒都能促进MSCs的增殖和成脂或成骨分化潜能,而转染shOct4或shIL-31都能抑制MSCs的增殖和成骨或成脂分化潜能。Oct4促进MSCs的增殖和成骨或成脂分化潜能已经被报道,在本研究中被作为阳性对照。本发明揭示了细胞因子IL-31对MSCs的自我更新和多向分化潜能起着关键调节作用提供了理论依据,为将MSCs用于再生医学和组织工程奠定了必要的基础。
附图说明
图1是本发明实施例1中将含有Oct4、IL-31、shOct4、shIL-31的慢病毒重组载体和作为对照的慢病毒空质粒分别感染UC-MSCs后,采用MTT方法检测细胞因子IL-31对UC-MSCs增殖影响的结果图;其中,*P<0.01相对于不同天数的空质粒对照。
图2是本发明实施例2中将含有shOct4、shIL-31的慢病毒重组载体和作为对照的慢病毒空质粒分别感染UC-MSCs后,检测细胞因子IL-31对UC-MSCs的成脂或成骨分化作用的结果图。
具体实施方式
下面结合实施例及附图对本发明作进一步的详细描述,但不用来限制本发明的范围。若未特别指出,实施例均参照常规实验条件,或者参照试剂盒制造厂商的说明书进行。实施例中所用到的工程菌、细胞株均为商业化的菌株或细胞株。大肠杆菌感受态细胞的制备按照《分子克隆》进行制备。
实施例1采用MTT方法检测IL-31对UC-MSCs增殖的影响。
(1)IL-31和shIL-31慢病毒表达载体的构建。
1)IL-31基因引物的设计。
用Primer 5.0软件设计扩增IL-31基因开放阅读框的引物,引物两端酶切位点分别为BamH I和HindⅢ,引物由上海生工生物有限公司合成,引物的序列如下:
IL-31正向引物:5’-TAGGATCCTCCCACACGTTGCCCGT-3’;
IL-31反向引物:5’-GCAAGCTTAGTGGTGGCCTGTTG-3’。
2)扩增IL-31基因。
以人Th2细胞(购自上海哈灵生物科技有限公司)的cDNA为模板扩增IL-31基因。
PCR扩增的反应体系如下:
PCR扩增的反应条件如下:
3)IL-31基因的回收。
将上述PCR产物进行1%琼脂糖凝胶电泳,并用Gel Extraction Kit(Omega)对PCR产物回收,实验步骤按试剂盒说明书,略有改动,步骤如下:
A、用手术刀片切下含有目的片段的琼脂糖胶,尽量切除DNA片段周围多余的琼脂糖胶以减少凝胶体积。
B、将凝胶块置于1.5ml微量离心管中。加入与凝胶等体积的Binding buffer(×p2)。将混合物置于50-55℃,7min,直到凝胶完全溶解。
C、将HiBind DNA离心柱置于2ml收集管中,将700μl DNA/琼脂糖溶液加至HiBindDNA离心柱,室温下,10,000×g离心1min。
D、弃去液体,将HiBind DNA离心柱重新放回相同的收集管,向HiBind DNA离心柱中加入300μl Binding buffer(×p2),室温下,10,000×g离心1min,洗HiBind DNA离心柱,弃去流出液并重新使用收集管。
E、加入700μl无水乙醇稀释的洗涤缓冲液洗涤HiBind DNA离心柱,室温下10,000×g离心1min。
F、弃去液体并最大转速空柱离心2min以干燥离心柱基膜。
G、将HiBind DNA离心柱置于干净的1.5ml离心管,向离心柱基膜中间滴加15-30μl洗脱缓冲液,室温放置1min后以13,000g离心1min洗脱DNA。
4)IL-31基因表达载体的构建。
将回收的IL-31 DNA片段和pGL3-Basic真核表达载体(Promega公司)经过BamHⅠ和HindⅢ双酶切处理,用T4 DNA连接酶将双酶切后的IL-31 DNA片段克隆至经双酶切的pGL3-Basic真核表达载体中,然后转染大肠杆菌DH5α感受态细胞,使用正向引物和反向引物对克隆进行筛选,将筛选得到的阳性克隆送去测序,DNA测序表明序列正确,命名为pGL3-IL-31。
5)IL-31慢病毒质粒的构建。
A、使用BamH I单酶切pGL3-IL-31及慢病毒载体pLVX-IRES-ZsGreen1(购买于汉恒生物科技有限公司);
B、使用T4 DNA连接酶将IL-31 DNA片段亚克隆入BamH I单酶切线性化的慢病毒转移质粒pLVX-IRES-ZsGreen1,然后转染大肠杆菌DH5α感受态细胞,通过限制性内切酶HindⅢ单酶切初步鉴定重组质粒,将鉴定正确的克隆送上海生工生物有限公司进行DNA测序,测序正确的克隆命名为pLVX-IL-31-ZsGreen1;大量提取质粒以备转染用。
6)shIL-31慢病毒质粒的构建。
在上海生工生物有限公司合成IL-31 shRNA颈环结构对应的DNA序列(含有XhoⅠ和NcoⅠ酶切位点),使用XhoⅠ单酶切IL-31 shRNA颈环结构对应的DNA序列及慢病毒载体pLVX-IRES-ZsGreen1,使用T4 DNA连接酶将IL-31 shRNA颈环结构对应的DNA序列克隆入线性化的慢病毒质粒载体pLVX-IRES-ZsGreen1,命名为pLVX-shIL-31-ZsGreen1。IL-31 shRNA颈环结构对应的DNA序列如下:
5’-CTCGAGAGAGGGCTACCTGGAGACACCATTG-3’。
(2)Oct4和shOct4慢病毒表达载体的构建(在本实验中做为对照组)。
1)Oct4基因引物的设计。
用Primer 5.0软件设计扩增Oct4基因开放阅读框的引物,引物两端酶切位点分别为XhoⅠ和NcoⅠ。引物由上海生工生物有限公司合成,扩增Oct4的引物序列如下:
Oct4正向引物:5’-CCGCTCGAGAGGATGGCGGGACACCTGGCTT-3’;
Oct4反向引物:5’-CATGCCATGGAAGGGCAGGCACCTCAGTTTG-3’。
2)扩增Oct4基因。
以人胚胎干细胞的cDNA(购自上海斯丹赛生物技术有限公司)为模板扩增Oct4基因。PCR扩增的反应条件同上,PCR扩增的反应体系如下:
3)Oct4基因的回收。
将上述PCR产物进行1%琼脂糖凝胶电泳,并对PCR产物回收纯化(步骤与上面IL-31基因的回收相同)。
4)Oct4表达载体的构建。
将回收的PCR产物通过XhoⅠ和NcoⅠ位点克隆至pGL3-Basic真核表达载体(Promega公司),命名为pGL3-Oct4,DNA测序表明序列正确。
5)Oct4慢病毒质粒的构建。
A、使用XhoⅠ单酶切pGL3-Oct4及慢病毒载体pLVX-IRES-ZsGreen1(购买于汉恒生物科技有限公司);
B、使用T4 DNA连接酶将Oct4 DNA片段与线性化慢病毒转移质粒pLVX-IRES-ZsGreen1连接,然后转染大肠杆菌DH5α感受态细胞,通过限制性内切酶NcoⅠ单酶切初步鉴定重组质粒,将鉴定正确的克隆送上海生工生物有限公司进行DNA测序,命名为pLVX-Oct4-ZsGreen1。将测序正确的克隆大量提取质粒以备转染用。
6)shOct4慢病毒质粒的构建。
在上海生工生物有限公司合成Oct4 shRNA颈环结构对应的DNA序列(含有XhoⅠ和NcoⅠ酶切位点),使用XhoⅠ单酶切Oct4 shRNA颈环结构对应的DNA序列及慢病毒载体pLVX-IRES-ZsGreen1,使用T4 DNA 连接酶将Oct4 shRNA颈环结构对应的DNA序列克隆入线性化慢病毒质粒载体pLVX-IRES-ZsGreen1,命名为pLVX-shOct4-ZsGreen1。Oct4 shRNA颈环结构对应的DNA序列如下:
5’-CTCGAGCCCTCACTTC ACTGCACTGCCATTG-3’。
(3)将含有目的基因的慢病毒转染UC-MSCs。
1)慢病毒的制备。
A、接种人肾上皮细胞系293T细胞(购自上海酶研生物科技有限公司)于多聚赖氨酸处理的100mm培养皿中,当细胞融合度达到80%时换液,将三质粒(pspax2,pMD2G,pLVX-IL-31-ZsGreen1、pLVX-shIL-31-ZsGreen1、pLVX-Oct4-ZsGreen1或者pLVX-shOct4-ZsGreen1)共转染293T细胞,培养6h后更换培养基;pspax2和pMD2G购买于优宝生物。
B、转染48h后收集病毒上清液,于4℃、4000r/min离心10min;收集离心后的上清液并过滤;
C、4℃、25000r/min离心2h后用无血清培养液溶解病毒沉淀;
D、使用有限稀释法测定病毒滴度,分装保存于-80℃冰箱中备用。
2)慢病毒的转染。
将脐带间充质干细胞(UC-MSCs,上海拜力生物科技有限公司)接种于六孔板中,当单层细胞生长密度达到80%~90%时加入1ml步骤1)得到的慢病毒颗粒(滴度为6×107TU/ml),并加入聚凝胺至终浓度为8μg/ml以促进病毒吸附。按照以下5组进行转染:IL-31为转染IL-31质粒(即pLVX-IL-31-ZsGreen1)的UC-MSCs,shIL-31为转染IL-31 shRNA(即pLVX-shIL-31-ZsGreen1)的UC-MSCs,Oct4为转染Oct4质粒(即pLVX-Oct4-ZsGreen1)的UC-MSCs,shOct4为转染Oct4 shRNA(即pLVX-shOct4-ZsGreen1)的UC-MSCs,对照为转染空质粒的UC-MSCs。
(4)MTT检测UC-MSCs的增殖。
1)将上述5组UC-MSCs分别做MTT实验。
A、将转染后的5组UC-MSCs培养于37℃、5%CO2培养箱中;
B、每24h分别取出5组UC-MSCs中的3个平行样,分别加入20μL MTT液(MTT试剂盒购于上海哈灵生物有限公司),继续培养4h;
C、小心吸去孔内培养基,每孔加入100μL DMSO,低速振荡10min,使结晶物充分溶解;
D、在酶标仪上490nm波长处测定各孔吸光度(A)值,用t检验统计分析。
结果显示:IL-31能促进UC-MSCs的增殖,shIL-31能抑制UC-MSCs的增殖(图1)。在此实验中采用Oct4作为阳性对照,Oct4也能促进UC-MSCs的增殖,sh Oct4也能抑制UC-MSCs的增殖。
实施例2检测IL-31对UC-MSCs成脂和成骨分化的作用。
(1)UC-MSCs的成脂分化及鉴定。
1)UC-MSCs的成脂分化;
A、采用含有shOct4或shIL-31的慢病毒分别转染UC-MSCs,采用含有空质粒的慢病毒转染作为对照;
B、将上述3种转染后的UC-MSCs按3×104cells/cm2的密度接种到含有生长培养基的48孔板中,生长培养基为含有10%(V/V)FBS的DMEM/F12(FBS购自广州宏新生物技术有限公司;DMEM/F12购自广州赛业生物科技有限公司)将接种好的培养板放在5%CO2的37℃培养箱中孵育;
C、培养24h后,从每个孔中轻轻吸掉UC-MSCs的生长培养基,加入200μlUC-MSCs成脂分化培养基A液,3天后换为成脂分化培养基B液,第4天又换回A液,如此循环,诱导分化21天(成脂试剂盒购自广州赛业生物科技有限公司);
2)UC-MSCs成脂分化的鉴定;
A、上述UC-MSCs分化21天后,吸出成脂分化培养基,用PBS冲洗1次,然后用4%多聚甲醛溶液固定30min;
B、PBS冲洗两次,用200μl油红O染色30min;
C、用PBS冲洗2-3次;
D、在光学显微镜下观察和拍照图像。
(2)UC-MSCs的成骨分化及鉴定。
1)UC-MSCs的成骨分化;
A、加入足量的0.1%明胶溶液到48孔板中完全覆盖其底部,旋转直到明胶溶液覆盖整个培养板的底部,于室温下至少静置30min;
B、吸干明胶溶液,在超净台中放置30min,使剩余的溶液完全蒸发;
C、采用含有shOct4或shIL-31的慢病毒分别转染UC-MSCs,采用含有空质粒的慢病毒转染作为对照;
D、将上述3种转染后的UC-MSCs按3×104cells/cm2的密度接种到预先涂有明胶溶液的培养板中,生长培养基为含有10%(V/V)FBS的DMEM/F12;将接种好的培养板放在5%CO2的37℃培养箱中孵育;
E、培养24h后,从每个孔中轻轻吸掉生长培养基,加入200μl UC-MSCs成骨分化培养基(成骨试剂盒购自广州赛业生物科技有限公司);诱导分化21天,每3天更换一次分化培养基;
2)UC-MSCs成骨分化的鉴定;
A、上述UC-MSCs分化21天后,吸出成骨细胞分化培养基,用PBS冲洗1次,然后用4%多聚甲醛溶液固定30min;
B、PBS冲洗两次,用200μl茜素红染色3-5min;
C、用PBS冲洗2-3次;
D、在光学显微镜下观察和拍照图像。
结果显示:shIL-31能降低UC-MSCs的成脂和成骨分化,表明IL-31能增强UC-MSCs的多向分化潜能(图2)。在此实验中采用shOct4作为阳性对照,shOct4也能降低UC-MSCs的成脂和成骨分化,表明Oct4也能增强UC-MSCs的多向分化潜能。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (5)
1.IL-31在制备调控间充质干细胞增殖和分化的制剂中的应用,其特征在于:是将IL-31蛋白或能表达IL-31的核酸制备为促进间充质干细胞增殖和分化的制剂;
所述的分化为成脂分化和成骨分化。
2.根据权利要求1所述的应用,其特征在于:所述的IL-31的氨基酸序列如SEQ ID NO.1所示。
3.根据权利要求2所述的应用,其特征在于:所述的IL-31的编码核苷酸序列如SEQ IDNO.2所示。
4.根据权利要求1所述的应用,其特征在于:所述的调控为正调控。
5.根据权利要求1所述的应用,其特征在于:所述的核酸为DNA序列。
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IL-6 signaling in autoimmunity, chronic inflammation and inflammation-associated cancer;Markus F. Neurath and Susetta Finotto;《Cytokine & Growth Factor Reviews》;20110305;第22卷;第83-89页 * |
Mucosal cytokine network in inflammatory bowel disease;Akira Andoh et al.;《World J Gastroenterol》;20080907;第14卷(第33期);第5154-5161页 * |
The IL-6/gp130/STAT3 signaling axis: recent advances towards specific inhibition;Christoph Garbers et al.;《Current Opinion in Immunology》;20150306;第34卷;第75-82页 * |
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