The establishment of stable transfection of human breast cancer cell line MDA-MD-468 with exogenous PTEN gene

To investigate exogenous PTEN gene transfected human breast cancer cell line MDA-MD-468.Methods Using the lipofectamine 2000 transfection technique,wild type PTEN gene was transducted into an in vitro cultured highly metastatic breast cancer cell line MDA-MD-468.After transfection,the cells were selected by G418.The resistant clones were chosen and expanded in DMEM culture medium.RT-PCR,immunohistochemical method and western blot were used to determine the expression of target genes.Results An anti-G418 cell clone was established and expanded in culture.The transfected PTEN gene MDA-MD-468 cells showed expression of PTEN mRNA and PTEN protein.Conclusion Human breast cancer cell line MDA-MB-468 established in this study expresses consistently exogenous PTEN genes.4 refs,6 figs.

DAPT suppresses the proliferation of human glioma cell line SHG-44

Objective:To explore the suppressing effect ofγ-secretase inhibitor DAPT on proliferation of human glioma cell line SHG-44 in vitro and its mechanism.Methods:The SHG-44 cell was treated by DAPT with different concentration.The proliferation of cells was detected by MTT assay;cell cycle and TSC of CD133^+were determined by flow cytometry analysis technique;the key factor in Notch signaling pathway(Notch-1,Delta-1,Hes-1)was measured by reverse transcrip tase-polymerase chain reaction and western blotting.Results:DAPT inhibited the growth and proliferation of SHG-44 cells significantly(P<0.05).And the inhibiting effect on SHG-44 cells produced by DAPT showed a dose-dependent manner.DAPT increased the rate of cells in G_0/G_1 phase of SHG-44 cells,while it decreased the rate of cells in S phase.TSC of CD133^+was significantly reduced after DAPT treated SHC-44 cells.The expression of protein and mRNA of Notch-1,Delta-1 and Hes-1 were gradually downregulated with the increase of DAPT doses.Conclusions:DAPT can downregulate these key factor in Notch signaling pathway,reduce the TSC of CD133+and inhibit the proliferation of SHC-44 cells.

Stable Expression of Antibacterial Peptide CecropinB in Dairy Goat Mammary Gland Epithelial Cells

The paper aimed at constructing the eukaryotic expression vector of CecropinB and transfecting it into the goat mammary epithelial cell line. The recombinant plasmid inserted with CecropinB was transfected into the goat mammary epithelial cell by liposome Tfx^M-20. By screening with G418, the stable transfected goat mammary epithelial cell line was established and the transcription and expression of CecropinB were identified by RT-PCR and agarose diffusion experiment, respectively. Results showed that eukaryotic expression vector pECFP-B was constructed successfully. Stable transfected goat mammary epithelial cell line was established and the CecropinB protein was expressed successfully. It provides the solid foundation for further experimental studies on the function of CecropinB.

稳定、高效表达人MCHR2的SHG-44细胞系的建立

目的:构建黑色素浓集激素受体2(MCHR2)真核表达载体pcDNA3.1(+)MCHR2,转染SHG-44细胞,建立稳定、高效表达人MCHR2的SHG-44细胞系。方法:PCR法从人胎脑cDNA文库扩增MCHR2全长cDNA片段。用基因重组方法将其克隆到pcDNA3.1(+),构建真核表达载体pcDNA3.1(+)MCHR2,并用LipofectamineTM转染到SHG-44细胞,通过G418筛选,建立稳定表达MCHR2的SHG-44细胞系,用RT-PCR、Western印迹及免疫荧光法检测MCHR2的表达。结果:扩增出MCHR2的全长cDNA;成功构建pcDNA3.1(+)MCHR2;RT-PCR、Western印迹及免疫荧光法检测到MCHR2的表达,提示成功建立了稳定、高表达MCHR2的SHG-44细胞株。结论:MCHR2-SHG-44细胞株的建立为进一步研究MCHR2的功能奠定了良好的实验基础。

稳定高效表达BRP 44的PC-3细胞系的建立

目的建立稳定高效表达BRP 44的PC-3细胞系。方法下载BRP 44的全长mRNA序列,用Oligo 6进行引物设计,在上下游引物的5’引入相应的HindⅢ、EcoR I限制性内切酶识别序列及保护碱基。提取LNCaP细胞的总RNA反转录成cDNA进行PCR扩增,产物连接到真核表达载体pcDNA 3．1／myc-His A中构建成重组体。重组载体经酶切和测序鉴定后,阳离子脂质体转染法转染PC-3细胞、G 418筛选、Northern杂交检测并挑选出表达最强的亚克隆。结果成功构建BRP 44的真核表达载体并获得高效稳定表达的BRP 44基因的PC-3细胞亚克隆。结论高效稳定表达BRP44的PC-3细胞亚克隆可用于下一步研究。

EIF4A3 shRNA慢病毒载体的构建及其稳定转染细胞系的建立

目的:构建真核细胞翻译起始因子4A3(EIF4A3)-短发夹RNA(shRNA)慢病毒载体,建立Neuro-2a-EIF4A3-shRNA稳定转染细胞系。方法:通过美国国家生物技术信息中心(NCBI)数据库检索EIF4A3基因序列,设计并合成PCR鉴定引物,并将其连接至经EcoRⅠ和AgeⅠ酶切的慢病毒GV493载体,构建GV493-EIF4A3-shRNA慢病毒质粒,PCR筛选阳性克隆并测序鉴定。将GV493空载质粒和GV493-EIF4A3-shRNA重组质粒分别转染至HEK293T细胞中,分别为GV493对照慢病毒和GV493-EIF4A3-shRNA慢病毒,转染48 h后收集慢病毒进行包装并测定病毒滴度。将Neuro-2a细胞分为空白组、GV493对照组和GV493-EIF4A3 shRNA组,空白组不作处理,GV493对照组和GV493-EIF4A3 shRNA组分别采用相应慢病毒感染Neuro-2a细胞,慢病毒感染复数(MOI)为100,使用10 mg·L-1嘌呤霉素筛选成功感染慢病毒的Neuro-2a细胞,荧光显微镜观察各组Neuro-2a细胞的生长状态和绿色荧光表达情况;实时荧光定量PCR(RT-qPCR)法和Western blotting法检测各组Neuro-2a细胞中EIF4A3 mRNA及蛋白表达水平。结果:PCR测序结果显示GV493-EIF4A3-shRNA重组质粒基因序列与设计合成的EIF4A3-shRNA序列一致,成功构建GV493-EIF4A3慢病毒载体。荧光显微镜观察可见HEK293T细胞荧光表达强烈,生长状态良好,慢病毒包装成功。GV493-对照慢病毒和GV493-EIF4A3-shRNA慢病毒的滴度均为2×10~8 TU·mL^(-1),GV493对照组和GV493-EIF4A3 shRNA组Neuro-2a细胞生长状态良好且表达绿色荧光,表明慢病毒感染稳定细胞系构建成功。RT-qPCR法,与空白组和GV493对照组比较,GV493-EIF4A3shRNA组Neuro-2a细胞EIF4A3mRNA表达水平明显降低(P<0.01)。Western blotting法,各组在相对分子质量49000处出现特异性条带,提示Neuro-2a细胞中EIF4A3蛋白表达成功;与空白组和GV493对照组比较,GV493-EIF4A3 shRNA组Neuro-2a细胞中EIF4A3蛋白表达水平明显降低(P<0.01)。结论:成功构建GV493-EIF4A3-shRNA慢病毒载体,建立了Neuro-2a-EIF4A3-shRNA稳定转染细胞系,为EIF4A3在颅内动脉粥样硬化的作用机制研究提供了参考。

Bβ448野生型及突变型纤维蛋白原稳定转染细胞系的建立

目的构建野生型(BβArg448)和突变型(BβLys448)纤维蛋白原稳定表达细胞系,为进一步研究BβArg448Lys基因多态性的病理生理学意义及相关蛋白功能研究提供实验基础。方法以含纤维蛋白原野生型Bβ链cDNA全长的表达载体pMLP-FGB(448G)为模板,采用PCR定点突变技术构建BβLys448表达载体,即突变型质粒pMLP-FGB(448A)。应用脂质体转染及药物加压筛选的方法,将纤维蛋白原Aα链、野生型/突变型Bβ链、γ链表达载体共同转染至CHO-K1细胞,RT-PCR检测各条链mRNA的表达。结果野生型及突变型纤维蛋白原稳定转染细胞系在转录水平构建成功。结论野生型及突变型纤维蛋白原稳定转染细胞等在转录水平构建成功,为进一步体外研究BβArg448Lys所致纤维蛋白原的结构与功能异常奠定了基础。

Growth and radiosensitivity of irradiated human glioma cell progeny

BACKGROUND： Progenitors of the immortalized human glioma cell line, SHG-44, are significantly less sensitive to irradiation. Two hypotheses regarding the mechanism of this effect exist： several studies have suggested that there is a subgroup with different radiosensitivities in identical cell group, and the progenitors of irradiate is a adaptive response subgroup, so its radiosensitivity is descend. A second hypothesis suggests that irradiated glioma progeny have a stronger ability to repair DNA damage. This would suggest that when progeny are continuously irradiated, resistance to irradiation-induced DNA increases, and radiosensitivity decreases. OBJECTIVE： To investigate radiosensitivity and growth features after irradiation to progeny of the human glioma cell line SHG-44. DESIGN, TIME AND SETTING： A randomized, controlled experiment, which was performed at the Department of Radiology Laboratory, the First Hospital Affiliated to Soochow University, between September 2004 and January 2006. MATERIALS： The glioma cell line SHG-44 was provided by the Institute of Neuroscience, First Affiliated Hospital of Suzhou University. Propidium iodide reagent was provided by Coulter Corporation. A linear accelerator, KD-2 type, was provided by Siemens, Germany. The flow cytometer EPICS-XL was provided by Coulter Corporation. METHODS： Brain glioma SHG-44 cells were divided into four groups： SHG-44, SHG-44-2, SHG-44-6, and SHG-44-10 . The SHG-44-2, SHG-44-6, and SHG-44-10 cells were vertically irradiated with varying doses of 2, 6 and 10 Gy by a linear accelerator （6 MVX）. The cells were passaged for 15 generations and cultured in RPMI-1640 culture media. MAIN OUTCOME MEASURES： Community re-double time, mean lethal dose （D0）, extrapolation number （N）, fraction surviving fraction irradiated by 2 Gy dose （SF2）, quasi-threshold dose （Dq）, and cell cycle. RESULTS： The Population doubling time （PDT） of SHG-44-2, SHG-44-6, and SHG-44-10 cell groups was not significant （P = 0.052）. Compared to these three groups, the PDT of the SHG-44 cell group was significantly difference （F = 7.878, P 〈 0.002）. SHG-44 cell clone ratewas 26.5%, and SHG-44-10 cell group was 15.5%. The SHG-44-10 cell group also exhibited radiosensitivity, but was less than the radiosensitivity of the SHG-44 cell group. Compared to the SHG-44 cell group, the ratio of the G2/M phase was decreased in the SHG-44-10 cell group, and the radio of S phase was increased. The SHG-44 and SHG-44-10 cell groups were irradiated with 8 Gy. After 12 hours, the G2/M ratio was compared to pre-irradiation times, indicating a significantly higher ratio in the pre-irradiated groups （P 〈 0.01）. The cells between S HG-44 and SHG-44-10 groups were harvested 12 hours after irradiation： G2 phase of SHG-44-10 cells was arrested and the G2/M ratio was increased, which was intensified with increasing irradiation doses. CONCLUSION： In the present study, the proliferation delay and decreased radiosensitivity were confirmed in progeny of irradiated human glioma cells, and radiosensitivity was dose-dependent.

人源WNT16 HEK 293T稳转细胞株构建、蛋白纯化与活性检测方法研究

目的无翅型MMTV整合位点家族成员16(WNT16)是一种重要的信号调节蛋白,参与多种细胞生物学过程的调控。本研究旨在构建稳定转染WNT16基因的HEK 293T细胞株,并利用多聚赖氨酸标签(HIS-Tag)实现高效纯化WNT16蛋白。方法使用TK-PCDH-copGFP-T2A-Puro载体,将WNT16 CDS-HIS序列通过XbaI和BamHI位点连接载体,构建慢病毒载体质粒;将该质粒与pSPAX2和pMD2.G一起共转染HEK 293T细胞,制备携带WNT16基因的慢病毒;利用慢病毒感染HEK 293T细胞,并通过嘌呤霉素筛选和Western Blot鉴定稳定过表达WNT16的细胞株;利用镍螯合琼脂糖凝胶与HIS标签的高亲和性纯化WNT16蛋白,使用考马斯亮蓝染色和Western Blot法检测纯化效果;用纯化的WNT16蛋白刺激Jurkat细胞,使用Western Blot法检测Jurkat细胞中β-catenin信号通路蛋白的水平,以评估WNT16蛋白的活性。结果成功构建过表达WNT16基因的慢病毒表达载体,并用其感染HEK 293T细胞。经过嘌呤霉素筛选和Western Blot鉴定,我们获得了稳定表达WNT16的HEK 293T细胞株。使用HIS标签成功纯化了WNT16蛋白,并用考马斯亮蓝染色和Western Blot法检测了纯化效果。最后,我们用纯化的WNT16蛋白刺激Jurkat细胞,并用Western Blot法检测了Jurkat细胞中β-catenin信号通路蛋白的水平,WNT16蛋白能够显著增加Jurkat细胞中β-catenin蛋白的表达,表明纯化的WNT16蛋白具有激活WNT/β-catenin通路的生物学活性。结论本研究成功实现了WNT16蛋白的高效表达和纯化,并初步研究了其功能。这为进一步探究WNT16在细胞生物学中的作用提供了重要的实验基础。

hFcεRIα/RBL-2H3细胞株的构建与评价

目的构建稳定表达人FcεRIα(h FcεRIα)亚基的RBL-2H3细胞株。方法利用RT-PCR技术克隆h FcεRIα基因,构建真核表达载体p CI-neo-h FcεRIα。脂质体介导法转染RBL-2H3细胞,G418筛选获得稳定转染细胞株。利用RT-PCR、Western blot及免疫荧光法鉴定转染结果。结果通过对脂质体介导转染体系进行优化,转染效率可高达75.38%。经Western blot、免疫荧光及RT-PCR鉴定,h FcεRIα基因在RBL-2H3细胞内成功表达。结论成功构建h FcεRIα/RBL-2H3细胞模型,为深入研究Ig E与FcεRI作用机制及相关药物开发提供了实验基础。

HBV基因组各基因真核表达载体的构建及转染

目的构建HBV基因组各基因真核表达载体,转染HepG2细胞,建立稳定转染的HepG2细胞系。方法采用PCR方法,以HBV全基因组质粒为模板扩增HBV基因的各基因片段,利用DNA重组技术将其定向插入到真核表达载体pcD-NA3.1(+),经酶切和测序鉴定后,用脂质体转染法转染HepG2细胞,通过G418筛选,建立稳定转染的HepG2细胞系,用细胞流式技术及细胞免疫组化技术检测HBV各基因产物在细胞内的表达。结果成功构建了pcDNA3.1(+)/HBs、pcDNA3.1(+)/HBc、pcDNA3.1(+)/HBe、pcDNA3.1(+)/HBp、pcDNA3.1(+)/HB-preS1、pcDNA3.1(+)/HB-preS2、pcDNA3.1(+)/HBx真核表达载体,并建立了稳定转染的HepG2细胞系,成功地表达目的基因。结论真核表达载体成功构建和稳定转染HepG2细胞系的建立为进一步研究各基因的功能奠定良好的实验基础。

人MCHR2真核表达载体的构建及稳定转染CHO细胞系的建立

目的构建人MCHR2真核表达载体,转染CHO细胞,建立稳定转染的CHO细胞系。方法采用PCR方法,以人胎脑cDNA文库为模板扩增人MCHR2基因的全长cDNA编码区序列,利用DNA重组技术将其定向插入到真核表达载体pcDNA3.1(+),经酶切和测序鉴定后,用脂质体转染法转染CHO细胞,通过G418筛选,建立稳定转染的CHO细胞系,用RT-PCR、W estern b lot及免疫荧光法检测MCHR2的表达。结果成功构建了pcDNA3.1(+)/MCHR2真核表达载体,并建立了稳定转染的CHO细胞系,成功地表达目的基因。结论真核表达载体成功构建和稳定转染CHO细胞系的建立为进一步研究MCHR2的功能奠定良好的实验基础。

人核因子-κBp65 shRNA慢病毒载体构建及对肺癌细胞恶性生物学行为的影响

背景与目的核因子-κB作为重要转录因子,与多种恶性肿瘤的发生发展有着密切联系,直接或间接抑制NF-κBp65的表达可逆转肿瘤细胞生物学行为。构建人核因子-κBp65基因shRNA重组质粒,感染A549细胞并筛选出稳定细胞株,对其迁移、粘附能力进行鉴定。方法设计并合成人核因子-κBp65的乱序对照序列(scramble)和干扰序列(shRNA)构建重组质粒,在5’端引入一个BamHI位点,3’端引入一个XhoI位点和EcoRI位点;感染A549细胞并由嘌呤霉素做稳转株的筛选;应用Western blot、qRT-PCR技术检测NF-κBp65的干扰效果及IκBα蛋白表达水平的变化;Transwell、MTT法分析其对A549细胞迁移、粘附能力的影响。结果成功构建重组质粒并筛选出A549/NF-κB p65scramble稳转株和A549/NF-κB p65 shRNA稳转株;A549/NF-κB p65 shRNA稳转细胞株与A549/NF-κB p65 scramble稳转细胞株及A549细胞相比NF-κBp65的mRNA、蛋白表达水平均下调;IκBα蛋白水平明显下调;细胞迁移能力及粘附能力均降低。结论本实验通过RNA干扰技术构建的重组慢病毒可有效抑制NF-κBp65 mRNA和蛋白的表达水平;抑制NF-κBp65可明显降低A549细胞的迁移和粘附能力。

逆转录病毒介导的靶向人Slingshot-1L基因的稳定转染细胞系的建立

目的应用Slingshot(SSH)-1L重组逆转录病毒载体,建立过表达该基因的稳定转染细胞系。方法用脂质体法将含SSH-1L的重组逆转录病毒载体pLNCX-SSH-1L转染PA317包装细胞,G418筛选,滴度测定。收集病毒上清感染MG63细胞,G418筛选。结果应用pLNCX-Slingshot-1L重组逆转录病毒载体,获得滴度为5×108 CFU/L的病毒上清,感染MG63细胞,获得了过表达SSH-1L基因的MG63细胞。结论应用SSH-1L重组逆转录病毒载体,成功建立了过表达该基因的稳定细胞系。

口蹄疫病毒VP2基因重组表达载体的构建及其稳定表达细胞系的建立

本试验旨在构建Asia 1型口蹄疫病毒(FMDV)的VP2基因重组表达载体,并建立稳定表达VP2基因的BHK-21细胞系。利用RT-PCR方法扩增Asia 1型FMDV的cDNA,获得VP2基因完整的编码区,构建可表达VP2的带有绿色荧光蛋白标记基因的pIRES2-EGFP-VP2重组表达载体。经鉴定正确后,利用LipofectamineTM2000将重组质粒转染293T细胞,通过Western Blot技术检测VP2蛋白的瞬时表达;然后再转染BHK-21细胞,通过G418筛选,形成单克隆细胞系,经荧光筛选到表达EGFP的抗性单克隆细胞,扩繁培养克隆细胞,再通过West-ern Blot技术检测其VP2的表达,最终筛选到稳定表达FMDVVP2基因的BHK-21细胞系。结果表明,VP2基因重组表达载体pIRES2-EGFP-VP2构建正确,能够在293T细胞内瞬时表达;转染BHK-21细胞,经G418筛选到表达VP2基因的BHK-21细胞克隆,经长达60d的传代,获得了稳定表达VP2基因和EGFP的BHK-21细胞系。上述结果表明,我们建立了稳定表达VP2基因的BHK-21细胞系,为进一步探讨VP2基因在FMDV诱导细胞凋亡中的作用奠定基础。

一种新的神经胶质瘤原位移植模型的建立

目的:建立一种新的可动态观察肿瘤细胞生长的大鼠神经胶质瘤原位移植瘤模型。方法:利用脂质体将含有强化绿色荧光蛋白(enhanced green fluorescence protein,EGFP)基因的真核表达质粒pEGFP-N1转染大鼠神经胶质瘤C6细胞,经G418筛选及亚克隆,获取稳定表达EGFP的细胞系C6-gfp。采用CCK-8试剂盒检测C6及C6-gfp细胞增殖情况;将C6-gfp细胞接种于Wistar大鼠颅内,通过B超、大体标本、荧光体视镜、H-E染色和免疫组化观察颅内成瘤情况及瘤组织中绿色荧光蛋白的表达。结果:流式细胞术分析体外培养的C6-gfp细胞97.7%产生绿色荧光;C6-gfp细胞与亲代C6细胞相比,生长曲线无明显不同(P>0.05)。C6-gfp接种于颅内3周后成瘤率达70%;利用B超可动态观察肿瘤生长,利用荧光体视镜可见肿瘤组织发出绿色荧光,可与周围正常组织区别。H-E染色可见肿瘤细胞核大,染色深,核分裂明显,瘤内有很多新生血管。免疫组化可见GFP阳性细胞染色深浅不一。结论:成功构建了能稳定高水平表达EGFP的大鼠神经胶质瘤C6-gfp细胞株,其生物学行为未发生改变,能在同系大鼠颅内成瘤。该模型为神经胶质瘤防治研究提供了良好的基础。

稳定高效表达正反义Alu-Sx细胞系的建立

目的建立稳定高效表达正反义A lu-Sx的细胞系。方法根据A lu亚家族Sx序列合成两对两端带有限制性酶切位点的引物,提取HEK293细胞的总DNA后PCR扩增,产物连接到真核表达载体pcDNA3.1/myc-H is A中构建成重组体。经酶切及测序鉴定后,阳离子脂质体转染法转染HEK293细胞后G418筛选稳定表达的细胞克隆,Northern杂交检测并挑选出表达最强的亚克隆。结果成功构建A lu亚家族Sx的正反义真核表达载体并获得高效稳定表达的HEK293细胞亚克隆。结论高效稳定表达正反义A lu Sx的HEK293细胞亚克隆可用于下一步研究。

逆转录病毒介导的靶向人Slingshot-1L基因稳定转染人骨髓间充质干细胞系的建立

目的建立过表达该基因的人骨髓间充质干细胞(hMSCs)稳定转染细胞系。方法采用密度梯度离心法联合贴壁培养法分离、纯化hMSCs。应用脂质体法将Slingshot-1L重组逆转录病毒载体pLNCX-Slingshot-1L转染PA317包装细胞,G418筛选,滴度测定。收集病毒上清感染第2代hMSCs,G418筛选,挑选阳性克隆,扩增培养。结果采用密度梯度离心法联合贴壁培养法成功分离、纯化了hMSCs,应用pLNCX-Slingshot-1L重组逆转录病毒载体转染PA317包装细胞,获得滴度为5×108CFU/L的病毒上清。收集病毒上清感染hMSCs,获得了过表达Slingshot-1L基因的hMSCs。结论应用Slingshot-1L重组逆转录病毒载体,成功建立了过表达该基因的hMSCs稳定转染细胞系。

Smyd1干扰真核表达质粒及其稳定转染H9c2细胞系的构建

运用RNA干扰技术(RNA interference RNAi)构建pSUPER.retro-Smyd1真核表达质粒,经鉴定后用脂质体法转染H9c2细胞,通过G418筛选出稳定表达pSUPER.retro-Smyd1的细胞系,最后经Western blot及RT-PCR实验鉴定其干扰效果。经鉴定,通过H9c2细胞系构建的pSUPER.retro-Smyd1干扰细胞系的干扰效果显著。因此,本实验成功构建了Smyd1干扰真核表达质粒及其稳定转染的H9c2细胞系,为进一步研究Smyd1基因在心脏发育中的作用奠定了良好的实验基础。

人透明质酸酶真核表达载体的构建及稳定转染CHO细胞系的建立

目的构建人透明质酸酶真核表达载体,并将其转染CHO细胞,建立稳定转染的CHO细胞系。方法根据已知的天然人透明质酸酶PH20的氨基酸序列,利用PCR技术,将其克隆至真核表达载体MO2中,得到表达质粒MO2/ph20。经酶切和测序鉴定后,用脂质体转染法转染CHO细胞,通过G418(800μg/mL)筛选,建立稳定转染的CHO细胞系,SDS-PAGE法检测重组人透明质酸酶的蛋白表达水平,利用3,5-二硝基水杨酸法检测筛选得到的4个阳性细胞克隆的生物活性。结果成功构建了MO2/ph20真核表达载体,并建立了稳定转染的CHO细胞系,成功地表达目的基因。重组人透明质酸酶表观相对分子质量约为70×103,4个阳性细胞克隆的酶活性均高于9000 U/L,其中MO2/ph20-4细胞株酶活性高达10 000 U/L以上。结论本研究成功构建了能够正确表达人透明质酸酶基因的真核表达载体MO2/ph20,并获得了有生物活性的重组人透明质酸酶,该体系的建立为进一步规模化生产重组人透明质酸酶奠定了基础。