HPV-16在HEK293T細胞中的復制以及HPV-16 L1病毒載體疫苗免疫效果的研究
發(fā)布時間：2018-07-15 17:45
【摘要】：人乳頭狀瘤病毒(human papillomavirus,HPV)為無包膜的小型雙鏈環(huán)狀DNA病毒,可引起皮膚和粘膜的良性和惡性腫瘤,基因組全長約8kb,分為早期區(qū)(E區(qū))、晚期區(qū)(L區(qū))和上游調控區(qū)(Upstream Regulatory Region,URR)。HPV以人為單一宿主,具有明顯的種屬特異性,且HPV病毒體僅存在于終末分化的上皮組織中,含量很少,很難在體外培養(yǎng)的細胞中增殖,這也阻礙了HPV基礎研究和疫苗研制。本研究以新疆株HPV-16全長基因組的質粒pTXJHPV-16轉染HEK293T細胞,以探討HPV-16在體外培養(yǎng)細胞中的復制。 pTXJHPV-16單獨或與pcDNA3.1-L1L2共同轉染HEK293T細胞,以及線性化的pTXJHPV-16單獨或與pcDNA3.1-L1L2共同轉染HEK293T細胞,均能產生病毒樣顆粒,且pTXJHPV-16單獨轉染細胞產生的病毒顆粒較多。繼而針對pTXJHPV-16單獨轉染HEK293T細胞以研究HPV-16的復制,PCR檢測HPV-16在HEK293T細胞中的存在狀態(tài);Southern blotting檢測轉染細胞2 h、20 h、40 h、60 h后,HPV-16基因組在HEK293T細胞中的復制及穩(wěn)定存在的時間;DpnⅠ酶切pTXJHPV-16轉染2 h、20 h、40 h的細胞基因組,Southern blotting檢測新合成的病毒DNA;RT-PCR檢測轉染細胞中HPV-16 E1、L1和E1^E4轉錄體。 結果表明,轉染細胞中存在完整的E1、E2基因,推測HPV-16以游離的形式存在。Southern blotting檢測發(fā)現HPV-16基因組在轉染20 h時有所減少,并持續(xù)到40 h,推測是細胞內HPV-16基因組被DNA酶消化;而在60 h后HPV-16基因組的量開始增加,說明HPV-16基因組在轉染細胞中得以復制。Southern blotting檢測表明轉染20 h后存在新合成的未被甲基化的HPV-16基因組,進一步說明HPV-16基因組在HEK293T細胞中可短暫復制。RT-PCR檢測到E1、L1、E1^E4轉錄體,表明HPV-16基因能在HEK293T細胞中表達。以上結果表明HPV-16能夠在HEK293T細胞中復制。 HPV主要衣殼蛋白L1具有較強的免疫原性,能夠自組裝形成病毒樣顆粒,是宮頸癌預防性疫苗的理想靶抗原。l型單純皰疹病毒(Herpes simplex virus type 1,HSV-1)為有包膜的DNA病毒,其作為載體具有基因容量大、宿主范圍廣、可高效率地感染分裂和非分裂細胞等優(yōu)勢。本研究利用HSV-1載體高效表達新疆株HPV-16 L1基因,以獲得HPV-16 L1病毒載體疫苗。 前期研究已獲得了刪除HSV-1內部反向重復序列的重組病毒HSV-1/BN。本研究將HPV-16 L1基因插入質粒pKO5/BN,獲得重組質粒pKO5/BN/L1,并電轉至含有BAC-HSV的大腸桿菌細胞中,經過溫度和抗生素篩選獲得重組DNA BAC-HSV-L1,將其轉染至Vero細胞中,篩選并純化獲得重組病毒HSV-1/L1,測定病毒滴度。分別通過滴眼、肌肉和皮下接種BALB/c小鼠,接種病毒量依次為1×105、1×10~6和1×10~6 pfu,連續(xù)免疫三次,每次間隔14d,同時設野生型HSV-1免疫對照組。分別于每次免疫前和第一次免疫后42d采小鼠血清, ELISA檢測L1特異性的IgG水平。PCR、Southern blotting檢測表明重組DNA BAC-HSV-L1構建正確,其在轉染細胞后獲得的重組病毒HSV-1/L1能在Vero細胞中大量增殖,測定其滴度為2.2×107;HSV-1/L1滴眼免疫組血清ELISA分析表明,免疫后14 d(P 0.01)、28 d(P 0.001)、42 d(P 0.001) HSV-1/L1組血清中L1抗體水平均極顯著高于HSV-1/WT免疫組,說明HSV-1/L1通過眼瞼免疫能夠激發(fā)體液免疫反應。肌肉和皮下接種均沒有激發(fā)體液免疫反應。以上結果為HSV-1載體疫苗的研究奠定了基礎。
[Abstract]:Human papillomavirus (human papillomavirus, HPV) is a small double stranded circular DNA virus without membrane. It can cause benign and malignant tumors of the skin and mucous membrane. The total length of the genome is about 8KB, which is divided into early region (E region). The late region (L region) and the upstream regulatory region (Upstream Regulatory Region, URR).HPV are a single host and have obvious species. Heterosexual, and HPV virus body only exists in terminal differentiated epithelial tissue, and it is very difficult to proliferate in the cells cultured in vitro. This also hinders the basic research and vaccine development of HPV. This study transfected HEK293T cells with the plasmid pTXJHPV-16 of the full-length genome of Xinjiang strain HPV-16 to explore the replication of HPV-16 in the cultured cells.
PTXJHPV-16 alone or pcDNA3.1-L1L2 co transfected HEK293T cells, as well as linear pTXJHPV-16 alone or co transfected with pcDNA3.1-L1L2 cells, can produce virus like particles, and pTXJHPV-16 alone transfected cells produced more virus particles. Then pTXJHPV-16 alone transfected HEK293T cells to study the replication of HPV-16. PCR detected the existence state of HPV-16 in HEK293T cells; Southern blotting detected the replication and stable existence of HPV-16 genome in HEK293T cells after transfection of 2 h, 20 h, 40 h, and 60 h; Dpn I enzyme was transfected to 2, 20, 40 cells. HPV-16 E1, L1 and E1^E4 transcripts in the cells.
The results showed that there was a complete E1, E2 gene in the transfected cells, and that the.Southern blotting detection in the free form of HPV-16 found that the HPV-16 genome was reduced when transfected to 20 h and continued to 40 h. It was presumed that the HPV-16 genome in the cells was digested by DNA enzyme, and the amount of the HPV-16 genome began to increase after 60 h, indicating the genome. The replication of.Southern blotting in transfected cells showed the existence of a newly synthesized non methylation HPV-16 genome after 20 h transfection, and further indicated that the HPV-16 genome could be briefly replicated in HEK293T cells by.RT-PCR to detect E1, L1, E1^E4 transcript, indicating that the HPV-16 gene could be expressed in the HEK293T cells. The above results showed that the HPV-16 genome was expressed in the HEK293T cells. It can be replicated in HEK293T cells.
HPV main capsid protein L1 has strong immunogenicity and can self assemble to form virus like particles. It is an ideal target antigen for the prophylactic vaccine of cervical cancer,.L herpes simplex virus (Herpes simplex virus type 1, HSV-1) as a coated DNA virus. As a carrier, it has a large gene capacity and a wide range of host, which can efficiently infect and divide and split the virus. In this study, the HPV-16 L1 gene of Xinjiang strain was highly expressed by HSV-1 vector, and HPV-16 L1 virus vector vaccine was obtained.
The previous study has obtained the recombinant virus HSV-1/BN. that deletes the internal reverse repeat sequence of the HSV-1. The HPV-16 L1 gene was inserted into the plasmid pKO5/BN, and the recombinant plasmid pKO5/BN/L1 was obtained and transferred to the Escherichia coli cells containing BAC-HSV. The recombinant DNA BAC-HSV-L1 was obtained through the screening of the temperature and antibiotics and transfected into Vero cells. The recombinant virus HSV-1/L1 was selected and purified to determine the titer of the virus. BALB/c mice were inoculated with 1 x 105,1 x 10~6 and 1 x 10~6 PFU respectively by eye drop, muscle and subcutaneous inoculation, respectively, for three consecutive immunizations, 14d at each interval, and the wild type HSV-1 immune control group. The mice were separated from the blood before and after the first immunization. ELISA detected L1 specific IgG level.PCR, and Southern blotting detection showed that recombinant DNA BAC-HSV-L1 was constructed correctly. The recombinant virus HSV-1/L1 could proliferate in Vero cells after transfection of cells, and its titer was 2.2 x 107; HSV-1/L1 eye immunization group showed that 14 (0.01) after immunization, 28 (0.001). The serum levels of L1 antibody in the 42 d (P 0.001) HSV-1/L1 group were significantly higher than those in the HSV-1/WT immunization group, indicating that HSV-1/L1 could stimulate the humoral immune response through the eyelid immunization. Both muscle and subcutaneous inoculation did not stimulate the humoral immune response. The above results lay a foundation for the study of the HSV-1 carrier vaccine.
【學位授予單位】：新疆大學
【學位級別】：碩士
【學位授予年份】：2010
【分類號】：R392
本文編號：2124871
[Abstract]:Human papillomavirus (human papillomavirus, HPV) is a small double stranded circular DNA virus without membrane. It can cause benign and malignant tumors of the skin and mucous membrane. The total length of the genome is about 8KB, which is divided into early region (E region). The late region (L region) and the upstream regulatory region (Upstream Regulatory Region, URR).HPV are a single host and have obvious species. Heterosexual, and HPV virus body only exists in terminal differentiated epithelial tissue, and it is very difficult to proliferate in the cells cultured in vitro. This also hinders the basic research and vaccine development of HPV. This study transfected HEK293T cells with the plasmid pTXJHPV-16 of the full-length genome of Xinjiang strain HPV-16 to explore the replication of HPV-16 in the cultured cells.
PTXJHPV-16 alone or pcDNA3.1-L1L2 co transfected HEK293T cells, as well as linear pTXJHPV-16 alone or co transfected with pcDNA3.1-L1L2 cells, can produce virus like particles, and pTXJHPV-16 alone transfected cells produced more virus particles. Then pTXJHPV-16 alone transfected HEK293T cells to study the replication of HPV-16. PCR detected the existence state of HPV-16 in HEK293T cells; Southern blotting detected the replication and stable existence of HPV-16 genome in HEK293T cells after transfection of 2 h, 20 h, 40 h, and 60 h; Dpn I enzyme was transfected to 2, 20, 40 cells. HPV-16 E1, L1 and E1^E4 transcripts in the cells.
The results showed that there was a complete E1, E2 gene in the transfected cells, and that the.Southern blotting detection in the free form of HPV-16 found that the HPV-16 genome was reduced when transfected to 20 h and continued to 40 h. It was presumed that the HPV-16 genome in the cells was digested by DNA enzyme, and the amount of the HPV-16 genome began to increase after 60 h, indicating the genome. The replication of.Southern blotting in transfected cells showed the existence of a newly synthesized non methylation HPV-16 genome after 20 h transfection, and further indicated that the HPV-16 genome could be briefly replicated in HEK293T cells by.RT-PCR to detect E1, L1, E1^E4 transcript, indicating that the HPV-16 gene could be expressed in the HEK293T cells. The above results showed that the HPV-16 genome was expressed in the HEK293T cells. It can be replicated in HEK293T cells.
HPV main capsid protein L1 has strong immunogenicity and can self assemble to form virus like particles. It is an ideal target antigen for the prophylactic vaccine of cervical cancer,.L herpes simplex virus (Herpes simplex virus type 1, HSV-1) as a coated DNA virus. As a carrier, it has a large gene capacity and a wide range of host, which can efficiently infect and divide and split the virus. In this study, the HPV-16 L1 gene of Xinjiang strain was highly expressed by HSV-1 vector, and HPV-16 L1 virus vector vaccine was obtained.
The previous study has obtained the recombinant virus HSV-1/BN. that deletes the internal reverse repeat sequence of the HSV-1. The HPV-16 L1 gene was inserted into the plasmid pKO5/BN, and the recombinant plasmid pKO5/BN/L1 was obtained and transferred to the Escherichia coli cells containing BAC-HSV. The recombinant DNA BAC-HSV-L1 was obtained through the screening of the temperature and antibiotics and transfected into Vero cells. The recombinant virus HSV-1/L1 was selected and purified to determine the titer of the virus. BALB/c mice were inoculated with 1 x 105,1 x 10~6 and 1 x 10~6 PFU respectively by eye drop, muscle and subcutaneous inoculation, respectively, for three consecutive immunizations, 14d at each interval, and the wild type HSV-1 immune control group. The mice were separated from the blood before and after the first immunization. ELISA detected L1 specific IgG level.PCR, and Southern blotting detection showed that recombinant DNA BAC-HSV-L1 was constructed correctly. The recombinant virus HSV-1/L1 could proliferate in Vero cells after transfection of cells, and its titer was 2.2 x 107; HSV-1/L1 eye immunization group showed that 14 (0.01) after immunization, 28 (0.001). The serum levels of L1 antibody in the 42 d (P 0.001) HSV-1/L1 group were significantly higher than those in the HSV-1/WT immunization group, indicating that HSV-1/L1 could stimulate the humoral immune response through the eyelid immunization. Both muscle and subcutaneous inoculation did not stimulate the humoral immune response. The above results lay a foundation for the study of the HSV-1 carrier vaccine.
【學位授予單位】：新疆大學
【學位級別】：碩士
【學位授予年份】：2010
【分類號】：R392
【參考文獻】
相關期刊論文 前1條
1 馬正海,張富春,梅新娣,馬彩玲,劉開江;新疆南部地區(qū)維吾爾族婦女宮頸癌組織中人乳頭狀瘤病毒16型L1基因突變譜分析[J];中華醫(yī)學雜志;2004年12期
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