CN1686541A - 人巨细胞病毒pp65蛋白质疫苗的制备方法 - Google Patents
人巨细胞病毒pp65蛋白质疫苗的制备方法 Download PDFInfo
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Abstract
本发明涉及一种人巨细胞病毒pp65蛋白质疫苗的制备方法,是一种用于预防母体原发性HCMV感染及阻断先天性HCMV感染的新生物制剂。通过提取HCMV DNA并以其为模板扩增出pp65(1006-1521nt)基因片段,克隆到PET100-TOPO原核表达载体,并在E.coli BL21细胞中进行外源目的基因的表达,大量提取并纯化pp65目的片段蛋白质。该疫苗显著特点就在于既可诱导细胞免疫又可诱导体液免疫,尤其是pp65蛋白质疫苗能诱导机体产生高效价的特异性抗体,副作用小,安全性高。该疫苗主要供预防HCMV原发性感染及阻断HCMV先天性感染。
Description
技术领域
本发明涉及一种蛋白质生物制剂,是一种用于预防母体原发性或激活性人巨细胞病毒(HCMV)感染,阻断HCMV垂直传播的疫苗。
背景技术
人巨细胞病毒(Human Cytomeglalovirus)HCMV属疱疹病毒β亚科的双股DNA病毒,人群中CMV感染非常广泛,初次感染通常呈隐性感染,少数有临床症状,60-90%成人已有CMV抗体,但大多数人感染后虽产生特异性抗体,但病毒并没有被从人体清除而转为长期带毒成为潜伏感染。在发生原发或激活性HCMV感染的妊娠妇女,可发生宫内感染甚至导致流产、胎儿畸形以及脑神经系统损害遗留的耳聋失明等后遗症。先天性HCMV感染主要来自于母体的垂直传播,因此必须在损害发生之前能有效地预防母体的HCMV原发性感染是阻断先天性HCMV感染发生的关键。
近年国外研制的两种HCMV减毒活疫苗(AD169和Townel 125)已在健康志愿者及器官移植者中进行试验,但该疫苗保护能力有限,且不能排除由于病毒长期潜伏体内发生激活及癌变的可能,随后有学者提取HCMV亚单位肽作为抗原进行动物试验及人体试验中,发现由该疫苗刺激机体、诱导产生的中和抗体无论在量及时间上都非常有限,且提取工艺复杂,价格昂贵。
发明内容
HCMVpp65蛋白质疫苗的制备方法,是利用分子生物学的技术和方法,先提取HCMV DNA,并以其为模板扩增出带有CTL和B淋巴细胞抗原优势表位的pp65(1006-1521nt)基因片段,克隆至PET100-TOPO原核表达载体,并在E.coliBL21细胞中进行外源目的基因的表达,鉴定其特异性及免疫原性后,大量提取并纯化HCMVpp65目的片段蛋白质。HCMVpp65蛋白质疫苗在诱导孕期妇女机体免疫反应中,可以打破母体生理免疫耐受状态获得较强的、特异性的体液免疫及细胞免疫,从而阻断HCMV先天性感染,得到良好的保护效果。
人巨细胞病毒pp65蛋白质疫苗的制备方法,其特征是提取HCMV DNA,并以其为模板扩增出带有CTL和B淋巴细胞抗原优势表位的pp65(1006-1521nt)基因片段,克隆至PET100-TOPO原核表达载体,并在E.coli BL21细胞中进行外源目的基因的表达,鉴定其特异性及免疫原性,大量提取并纯化pp65目的片段蛋白质。
目前pp65蛋白质疫苗仅使用于鼠模型:实验中本发明选择的是Balb/c小鼠(SPF级)30只、重约18-20g随机分为五组,每组六只:
A组(pp65蛋白质疫苗免疫组)每只小鼠初次分别经背部皮下多点注射50μgTpp65蛋白,于第2、4周分别经背部皮下多点加强注射50μgTpp65蛋白;B组(Tpp65 DNA免疫组)每只小鼠分别在第0、2、4周经股四头肌注射200μgpcDNA3.1-Tpp65质粒DNA;C组(Tpp65蛋白质和DNA联合免疫组)每只小鼠分别在第0、2周经股四头肌注射200μgpcDNA3.1-Tpp65质粒DNA,在第四周经背部皮下多点注射50μl Tpp65蛋白质(1μg/μl)+50μl CFA;D组(空质粒阴性对照组)每只小鼠分别在第0、2、4周经股四头肌注射200μgpcDNA3.1空质粒;E组(空白对照组)每只小鼠分别在第0、2、4周经股四头肌注射200μl生理盐水。末次免疫后的第3d,采血,收集血清,检测各组小鼠血清中的pp65抗体水平;同时,取各组小鼠脾细胞,用重组pp65蛋白质作为抗原刺激,MTT法测定T淋巴细胞的增殖指数和脾脏的特异性杀伤细胞率;双抗体夹心ELISA法定量检测脾细胞上清中IFN-γ的含量。
结果:Tpp65蛋白质、Tpp65DNA、Tpp65蛋白质片段+Tpp65 DNA联合免疫、空质粒阴性对照组、空白对照组,血清抗体效价分别为:A组1∶678.81;B组1∶67.32;C组1∶240;;D组和E组均<1∶10。增殖指数分别为:A组6.76±1.82;B组5.43±1.56;C组7.18±1.95;D组2.74±0.95;。CTL杀伤率分别为:A组71.00%±18.82%;B组56.86%±16.62%;C组73.58%±22.61%;D组23.58%±4.28%。IFN-γ分别为:A组747.66±46.17ng/L;B组464.12±29.95ng/L;C组787.97±56.90ng/L;D组100.06±9.76ng/L
pp65蛋白质疫苗显著特点就在于既可诱导细胞免疫又可诱导体液免疫,虽然在诱导细胞免疫方面次于Tpp65蛋白质和DNA联合免疫组,但是pp65蛋白质疫苗却能诱导机体产生很高效价的、并且特异性很强的抗体,并且针对性强,副作用小,安全性高。该疫苗主要供预防母体HCMV原发性感染及阻断HCMV先天性感染。
具体实施方式
1、目的基因的提取、扩增、纯化
1.1将HCMV AD169标准株病毒接种至人胚成纤维细胞中,增殖至90%的细胞出现特征性病变时,收集破碎细胞,离心取上清,加蛋白酶K至终浓度为500ng/L、37℃作用1小时,加入10%SDS至终浓度为1%,37℃作用1小时,酚∶氯仿∶异戊醇(25∶24∶1)抽提两次,氯仿∶异戊醇(24∶1)抽提一次,将抽提液加入透析袋内,用双蒸水透析48小时,每6-8小时换液一次,用PEG(分子量20000)浓缩,4℃保存。
1.2利用PCR技术、以HCMVDNA为模板扩增pp65(1006-1521nt)基因(简称pp65)
1.3PCR产物的纯化,按商品化试剂盒说明书进行操作,并将纯化后的PCR产物置于4℃保存。
2、pp65目的基因与原核表达载体TOPO的连接、转化、鉴定
2.1建立如下反应混合物体系:
经过PCR试剂盒纯化的pp65DNA:2μl
盐溶液(TOPO载体试剂盒配带):1μl
无菌双蒸水:2μl
TOPO载体:1μl
2.2将上述反应混合物均匀混合,在室温下(22℃-25℃)孵育5min。
2.3将3μl的连接物(含有连接物的混合物)加入一管TOP10感受态细胞,冰上放置5min、42℃90sec,立即冰上放置1-2min、加800μlSOC(SOC是一种公认的培养基其成分有胰蛋白胨,葡萄糖,酵母提取物,去离子水,NaCl),37℃缓慢摇菌1h、涂布LB平板(含100μg/μlAmp)。室温放置15min,37℃倒置培养过夜。
2.4阳性克隆的质粒提取
2.5PCR鉴定:将重组质粒置于沸水浴中5min,再立即置于冰上,分别以其为模板与pp65引物进行PCR反应,然后作1.5%琼脂糖凝胶电泳分析。引物:
p1:5’-CACCATGGATATCGACTTGCTGCTGC3’,
p2:5’-TCAATTCTGACCCTGAACCGTAGCCACC-3’
由上海生工生物工程公司提供。
2.6阳性克隆的测序鉴定:进行DNA测序,测序结果见附图。
3、重组基因的转化、表达及鉴定
3.1已经过鉴定、纯化的重组质粒转化E.coli BL21宿主菌,
3.2 pp65重组蛋白诱导表达:,
3.2.1挑选阳性菌落点种于3ml Amp/LB(氨苄青霉素/LB)液体培养基中、37℃振荡培养过夜,
3.2.2次日取1∶50扩大培养、37℃振荡4h、待光密度吸收值OD600(指在600个纳米处光密度吸收值)值达0.6时,留取菌液1ml,4000r/min弃上清,为未诱导管。
3.2.3在余下的菌液中加入1ml IPTG(指异丙基硫代-β-D-半乳糖苷)至终浓度为1mmol/L,37℃振荡、诱导6h后分别留取菌液1ml,4000rpm离心5min,留菌体沉淀,
3.2.4加入蛋白上样缓冲液(成份:100mmol/lTris-cl PH6.8,200mmol/l二硫苏糖醇,4%SDS(电泳级),0.2%溴酚蓝,20%甘油。)100μl,置沸水中8min裂解细菌,-20℃冻存备用。
3.3重组蛋白表达产物SDS-PAGE蛋白电泳:5%浓缩胶、80v和12%分离胶、150v。剥胶,染色,脱色。
3.4 Western-blotting法检测表达蛋白质的免疫原性,结果见附图。
4、pp65重组蛋白的大量诱导表达
4.1菌种保存:
将目的蛋白表达量较高的菌株按1∶10(w/v)的比例接种于LB培养基,37℃、220rpm摇床振荡培养至OD600约为0.4-0.6,加入终浓度为30%mg/ml的甘油,混匀后分装成1ml的小管,-80℃保存,作为原始菌种。
4.2 pp65重组蛋白的诱导表达:
4.2.1将-80℃冻存已鉴定的阳性菌液接种于LB琼脂平板,37℃培养过夜。次日,从平板上挑取单个阳性菌落。
4.2.2挑取单菌落接种于3ml LB培养基37℃,220rpm摇床振荡培养。
4.2.3再次以1∶100比例接种于50ml LB培养基37℃,220rpm摇床振荡培养,至OD600约为0.6-0.8。
4.2.4再次以1∶100比例接种于300ml LB培养基37℃,220rpm摇床振荡培养,至OD600约为0.4-0.6。
4.2.5加入IPTG(诱导剂异丙基硫代-β-D-半乳糖苷)至终浓度为1mmol/L,继续培养5h。
4.2.6用4000rpm离心10min,收集菌体,
4.2.7用PBS(成份:每1000ml含NaCl 8.0g、KH2PO4 0.2g、Na2HPO4·12H2O 2.9g、KCl 0.2g)缓冲液洗涤菌体两次后,称取菌体湿重,于-20℃保存。
4.3蛋白质的制备:
4.3.1大量表达菌体的破碎:采用超声破碎法超声破碎菌体,提取菌体悬液在4℃12000rpm离心10min、弃上清、沉淀用超声破碎液(指20mmol/LTris-clPH8.0 100mmol/l NaCl 2mmol/LEDTA)重悬,继续重复以上步骤3-4次,至上清液离心后呈清亮为止。
4.3.2包涵体的洗涤和纯化:超声裂解后的菌体在4℃12000rpm离心10min弃上清、并将每份沉淀重悬于1ml含2M尿素的TE(20mmol/LTris-cl PH8.0,2mmol/LEDTA)缓冲液中,继续重复以上步骤4-5次,到出上清将沉淀重悬于1ml水中,从沉淀中吸出10μl样品,与2XSDS-PAGE凝胶加样缓冲液混合,通过SDS-PAGE电泳进行分析,以确定蛋白质洗涤程度。
4.3.4蛋白质定量:利用紫外分光光度计法。
Claims (1)
1、人巨细胞病毒pp65蛋白质疫苗的制备方法,其特征是提取HCMV DNA,并以其为模板扩增出带有CTL和B淋巴细胞抗原优势表位的pp65(1006-1521nt)基因片段,克隆至PET100-TOPO原核表达载体,并在E.coli BL21细胞中进行外源目的基因的表达,鉴定其特异性及免疫原性,大量提取并纯化pp65目的片段蛋白质。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010148541A1 (zh) * | 2009-06-26 | 2010-12-29 | 鑫品生医科技股份有限公司 | 含衍生自细胞巨大病毒的胜肽的免疫原组成物及使用方法 |
| CN104086651A (zh) * | 2014-07-03 | 2014-10-08 | 湖南师范大学 | 抗HCMV Pp65蛋白单克隆抗体的制备方法及其应用 |
| CN104321444A (zh) * | 2012-03-27 | 2015-01-28 | 变异生物技术公司 | 用于检测抗巨细胞病毒中和抗体的方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010148541A1 (zh) * | 2009-06-26 | 2010-12-29 | 鑫品生医科技股份有限公司 | 含衍生自细胞巨大病毒的胜肽的免疫原组成物及使用方法 |
| CN104321444A (zh) * | 2012-03-27 | 2015-01-28 | 变异生物技术公司 | 用于检测抗巨细胞病毒中和抗体的方法 |
| US10006096B2 (en) | 2012-03-27 | 2018-06-26 | Variation Biotechnologies Inc. | Methods for detection of anti-cytomegalovirus neutralizing antibodies |
| US10161010B2 (en) | 2012-03-27 | 2018-12-25 | Variation Biotechnologies Inc. | Methods for detection of anti-cytomegalovirus neutralizing antibodies |
| CN104086651A (zh) * | 2014-07-03 | 2014-10-08 | 湖南师范大学 | 抗HCMV Pp65蛋白单克隆抗体的制备方法及其应用 |
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