CN117986353A - 重组人xvii型胶原蛋白、其制备方法及应用 - Google Patents
重组人xvii型胶原蛋白、其制备方法及应用 Download PDFInfo
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Abstract
本专利申请公开了一种重组人XVII型胶原蛋白、其制备方法及应用。所述重组人XVII型胶原蛋白为人XVII型胶原蛋白的截短蛋白,其氨基酸序列如SEQ ID NO:1所示。具有毛囊修复、所述重组人XVII型胶原蛋白来自传统上认为无生物活性的非G‑X‑Y结构区,但却具有良好的毛囊修复、毛发再生生物活性,甚至超过了促毛发生长的常用药米诺地尔。
Description
技术领域
本发明属于基因工程、合成生物学技术领域,涉及一种重组人XVII型胶原蛋白及制备方法和应用
背景技术
目前已经发现的胶原蛋白约有20种。各种类型的胶原蛋白的一个共同点就是其氨基酸排列有明显规律,会频繁出现G-X-Y重复结构,其中,G代表甘氨酸,X和Y代表另外两种氨基酸,最常见的是脯氨酸和羟脯氨酸。一般认为,胶原蛋白的G-X-Y结构区与其三螺旋结构的形成及生物学活性密切相关,而非G-X-Y结构区仅起到辅助作用。
人XVII型胶原蛋白是一种跨膜型非成纤维胶原蛋白,是细胞中半桥粒的一种组成成分,在上皮细胞一基底膜的作用中发挥重要作用。
发明内容
发明人在研究中意外发现,一段来自人XVII型胶原蛋白的非G-X-Y结构区的截短蛋白具有显著的修复毛囊细胞、促进毛发再生的生物学活性。基于此,本发明的目的在于提供一种具有毛囊修复、毛发再生活性的重组人XVII型胶原蛋白。
本发明包括:
1.一种具有毛囊修复、毛发再生活性的重组人XVII型胶原蛋白,其为人XVII型胶原蛋白的截短蛋白,其氨基酸序列如SEQ ID NO:1所示。
2.编码权利要求1所述的重组人XVII型胶原蛋白的核酸。
3.包含权利要求2所述的核酸的表达载体。
4.导入了权利要求3所述的表达载体的宿主细胞。所述宿主细胞可以为毕赤酵母、酿酒酵母、大肠杆菌或枯草芽抱杆菌,优选为毕赤酵母。
5.一种生产权利要求1所述的重组人XVII型胶原蛋白的方法,其包括:培养权利要求4所述的宿主细胞并收集细胞培养物的步骤。
6.根据权利要求5所述的方法,其还包括对所述细胞培养物进行分离纯化的步骤,所述分离纯化采用盐析、色谱层析、离子交换层析、亲和层析、疏水层析、酸碱沉淀、膜分离中的一种或几种的组合。
7.一种产品,其包含权利要求1所述的重组人XVII型胶原蛋白,所述产品为医药品、化妆品、保健品或医疗器械。
8.权利要求1所述的重组人XVII型胶原蛋白在制备医药品、化妆品、保健品或医疗器械中的用途。
所述医药品、化妆品、保健品或医疗器械可以用于毛囊修复、毛发再生,例如可以为洗发水、洗发膏、护发素等产品。
与现有技术相比,本发明具有如下有益效果:
1)本发明的重组人XVII型胶原蛋白来自传统上认为无生物活性的非G-X-Y结构区,但却具有良好的毛囊修复、毛发再生生物活性,甚至超过了促毛发生长的常用药米诺地尔。
2)本发明的重组人XVII型胶原蛋白是天然人XVII型胶原蛋白的截短蛋白,且不包含胶原区的C-端、N-端的氨基酸序列,免疫原性小。
3)本发明的重组人XVII型胶原蛋白可以在常用表达系统、特别是毕赤酵母工程菌中表达生产,表达量高且无内毒素隐患。而且,该重组人XVII型胶原蛋白可以不携带组氨酸标记等纯化标签,可通过分子筛进行纯化,最终直接可得目的蛋白,不需要额外切除组氨酸标记等纯化标签。
4)本发明的重组人XVII型胶原蛋白制备方法适于工业化大规模生产,并且制备出的产品没有动物来源的感染源,因此生物安全性更高。
附图说明
图1为显示实施例1的表达重组人XVII型胶原蛋白的毕赤酵母工程菌的构建过程的图。
图2为实施例2中纯化得到的重组人XVII型胶原蛋白的SDS-PAGE电泳图。
图3为实施例3中重组人XVII型胶原蛋白在毛囊修复、毛发再生的功效试验毛囊细胞图。
具体实施方式
本发明提供一种可有效修复毛囊细胞,促进毛发再生的重组人XVII型胶原蛋白,氨基酸序列如SEQ ID NO:1所示。针对宿主细胞表达进行密码子优选,在设计过程中两端分别添加EcoRI及NotI酶切位点以有利于后期基因操作。经过上述优化获得编码所述重组人XVII型胶原蛋白的基因。本发明还提供了含有所述基因的表达载体,所述载体可以含有调节序列(如转录和翻译起始和终止密码子),其对待引入载体的宿主的类型(例如,细菌、真菌、植物或动物)具有特异性,酌情并考虑载体是基于DNA还是基于RNA。
在一个具体的实施方式中,所述表达载体为pPiczaA,其核苷酸序列如SEQ ID NO:2所示。
本发明还提供了一种包含所述表达载体的宿主细胞,所述宿主细胞是指己引入外源核酸的细胞,包括此类细胞的后代。宿主细胞包括转化体和转化细胞,其包括原代转化细胞和源自其的后代,不考虑传代次数。后代在核酸含量上可能与亲代细胞不完全相同,但可能含有突变。所述宿主细胞选自毕赤酵母、酿酒酵母、大肠杆菌、枯草芽抱杆菌中的任意一不中。在一个具体的实施方式中,所述宿主细胞为毕赤酵母X33。
本申请提供一种制备所述重组人XVII型胶原蛋白的方法,其包括如下步骤:利用上述的宿主细胞进行表达,然后进行分离纯化得到。所述将宿主细胞进行表达指的将宿主细胞进行培养,培养基和培养条件对于本领域技术人员来说是公知的。
在一个具体的实施方式中,所述宿主细胞为毕赤酵母,得到毕赤酵母基因工程菌后,具体的培养条件如下:将毕赤酵母基因工程菌接种于YPD培养基中,于30℃,220rpm条件下培养22-24h,至OD600=18-20作为上罐种子液,将种子液扩培后按10%接种量接入初始体积为5L的NBS 415发酵罐中,培养温度为28-30℃,pH=5.0-6.0,溶氧控制在20%-30%,待甘油耗尽,开始进入甘油补料培养,至菌体湿重达到200g/L以上时,开始进行诱导培养。
对于表达方式,本发明不作任何限制,其可以根据需要进行确认,例如表达为诱导表达,对于诱导表达,其诱导剂为甲醇。
在一个具体的实施方式中,流加甲醇进行诱导培养,诱导阶段温度为28℃,pH为5.0,诱导48h放罐。
对于分离纯化的方法,本申请不作任何限制,其可以根据进行确定,例如可以使用盐析法、超滤法、亲和层析法和凝胶过滤层析法。
实施例1:SEQ ID NO:1所示的重组人XVII型胶原蛋白的表达
化学合成重组人XVII型胶原蛋白基因。合成时在5’端和3’分别加入了EcoRI和NotI识别位点和信号肽识别位点,经限制性内切酶SacI线性化后克隆至表达载体pPICZaA中,以毕赤酵母X33为表达宿主菌,通过电转化将获得的pPICzaA-XVII克隆质粒线性化后转化到X33中。以博来霉素梯度法挑选高拷贝阳性克隆,30.0C培养72h得到毕赤酵母基因工程菌。该毕赤酵母工程菌的简要构建过程如图1所示。
将上述得到的毕赤酵母基因工程菌接种于YPD培养基,培养至OD600=25±3时,按10%接种量接入初始体积为5L的NBS 415发酵罐中,培养温度为30℃、p H=5.5、OD控制在20%-30%,待甘油耗尽,开始进入甘油补料培养,至菌体湿重达到200g/L以上时,开始流加甲醇进行诱导培养,诱导阶段温度为28℃,pH为5.0,诱导48h放罐,离心收集上清液。
实施例2:重组人XVII型胶原蛋白的纯化
将实施例1离心收集的上清液超滤至初始体积的50%时,加入3-5倍体积的纯水,再经超滤浓缩至初始体积的5%。
将浓缩后的上清液加入60%饱和硫酸铵,常温下搅拌30min,9000rpm离心l0min后收集沉淀,将得到的沉淀溶解于500mL 0.05M,pH为7.0的PBS后经0.22um滤膜过滤;
超滤脱盐:G25脱盐柱脱盐,即采用25mL G25填料,操作过程与凝胶过滤层析步骤类似,每次上样6.5mL,收集8mL左右,上样l0min后即可完成脱盐。
经超滤浓缩至初始体积的20%-30%,然后置于-20℃冰箱预冻4h,然后转入真空冷冻干燥机中进行冻干,48h后收集冻干后蛋白,将冻干后的蛋白样品保存至-80℃冰箱,以便后期使用。图2为所述蛋白样品的SDS-PAGE电泳图。
实施例3:重组人XVII型胶原蛋白在毛囊修复、毛发再生的功效试验
1.猪毛囊的分离:取新鲜猪耳一只,放入加有冰块的容器中保存(保存时间不超过12h)。解剖时反复用自来水冲洗1min,75%乙醇冲洗2次.用手术剪刀沿耳廓边缘约5-8mm剪下皮肤,剪下的皮肤组织放入含1000U/mL青霉素和1000ug/mL链霉素的0.1mol/L的PBS中清洗10min,然后放入Williams E培养基。将上述切下的皮肤沿毛发生长方向进一步切成大约1.5mm厚度的皮肤小片,解剖显微镜下,用手术刀将生长期毛囊分离出来,并将皮脂腺开口水平以上部分切除,然后放入Williams E培养基中培养。
2.猪毛囊的体外无血清培养:毛囊培养在24孔板进行,每孔放1个毛囊,每孔加Williams E培养基1mL,内含L-谷酞胺2.0mmol/L,青霉素100U/mL和链霉素100ug/mL,放入37℃的5% CO2的孵箱中培养。
3.实验分组:实验分为2组,每组10个生长期的毛囊。对照组Williams E培养基中加米诺地尔0.5mM;试验组在Williams E培养基中加入重组人XVII胶原蛋白0.5重量%。需要说明的是,本实施例中米诺地尔的用量为0.5mM,这是临床上考虑到安全性和治疗效果后推荐的最佳用量。而本发明的重组人XVII胶原蛋白安全无毒,如追求更好的治疗效果,其用量尚有提升的空间。
4.毛发生长情况观察:分别于培养的第1天和第7天,在倒置显微镜下,通过目镜测微器测量毛囊底部到毛发顶部的长度,2次测量结果相减为毛发生长长度,同时在倒置显微镜下观察毛球部的形态变化。
5.TUNEL法检测毛囊中的凋亡细胞:收集培养第7天的毛囊后,OCT包埋,制备成7um厚的冰冻切片,每个毛囊制备3张冰冻切片,取其结构最完整的1张切片染色。4%多聚甲醛固定30min,3%的H2O2中10min封闭内源性过氧化物酶活性,参照原位细胞凋亡检测试剂盒的说明进行操作,苏木素复染,脱水,透明,封片,观察,多媒体图像分析仪分析计数每张切片中凋亡细胞数。
6.统计学处理:实验数据用SPSS19.0统计软件进行统计学处理,统计变量以ˉx士s表示,采用双样本t检验,值取双侧a=0.05。
试验结果:1.毛发生长长度:培养第7天,对照组和试验组毛囊平均毛发生长长度分别为(1.906士0.02)mm,(2.393士0.02)mm,对照组毛囊毛发生长长度低于试验组,两者存在显著性差异(P<0.001)。
7.毛囊毛球部形态变化:培养第7天,对照组毛囊已发生退行性改变,毛囊真皮鞘和外根鞘变薄,毛囊缩短,毛球部萎缩;试验组毛囊在5%重组人XVII胶原蛋白冻干物水溶液作用下,仍表现为生长期毛囊形态,毛囊形态结构变化程度小,毛母质细胞包裹着毛乳头。见图3。
8.TUNEL法检测毛囊中的凋亡细胞:培养第7天,对照组和试验组平均每个毛囊中凋亡细胞数分别为21.8士0.44和5.2士0.82,对照组毛囊中的凋亡细胞数要高于试验组,两者存在显著性差异(P<0.001)。
序列信息
SEQ ID NO:1
SGPSEGGSS STMYVSGPPG PPGPPGPPGS ISSSGQEIQQ YISEYMQSDSIRSYLSGVQGPPGPPGPPGPVTTITGETFD YSELASHVVS YLRTSGYGVSLFSSSISS
SEQ ID NO:2
TCTGGTCCATCTGAAGGTGGTTCTTCTTCTACTATGTACGTTTCTGGTCCAC
CAGGTCCACCAGGTCCACCAGGTCCACCAGGTTCTATTTCTTCTTCTGGTC
AAGAAATTCAGCAGTACATCTCCGAATACATGCAATCCGATTCTATCAGAT
CTTACTTGTCCGGTGTTCAAGGTCCACCAGGTCCACCAGGTCCACCAGGT
CCAGTTACTACTATTACTGGTGAAACTTTTGACTACTCCGAGTTGGCTTCT
CATGTTGTCTCTTACTTGAGAACTTCTGGTTACGGTGTTTCTTTGTTTTCCT
CCTCTATTTCCTCT 。
Claims (8)
1.一种具有毛囊修复、毛发再生活性的重组人XVII型胶原蛋白,其为人XVII型胶原蛋白的截短蛋白,其氨基酸序列如SEQ ID NO:1所示。
2.编码权利要求1所述的重组人XVII型胶原蛋白的核酸。
3.包含权利要求2所述的核酸的表达载体。
4.导入了权利要求3所述的表达载体的宿主细胞。所述宿主细胞可以为毕赤酵母、酿酒酵母、大肠杆菌或枯草芽抱杆菌,优选为毕赤酵母。
5.一种生产权利要求1所述的重组人XVII型胶原蛋白的方法,其包括:培养权利要求4所述的宿主细胞并收集细胞培养物的步骤。
6.根据权利要求5所述的方法,其还包括对所述细胞培养物进行分离纯化的步骤,所述分离纯化采用盐析、色谱层析、离子交换层析、亲和层析、疏水层析、酸碱沉淀、膜分离中的一种或几种的组合。
7.一种产品,其包含权利要求1所述的重组人XVII型胶原蛋白,所述产品为医药品、化妆品、保健品或医疗器械。
8.权利要求1所述的重组人XVII型胶原蛋白在制备医药品、化妆品、保健品或医疗器械中的用途。
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