CN1081069C - Curative vaccinum for hepatitis B and preparing method therefor - Google Patents
Curative vaccinum for hepatitis B and preparing method therefor Download PDFInfo
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Abstract
The present invention provides a novel therapeutic hepatitis B vaccine and a method for preparing the vaccine. The vaccine uses plasmid deoxyribonucleic acid (DNA) as a basis, and is formed by that the genetic transcription of polypeptide(preS polypeptide and integral HBSAg) containing a hepatitis B virus surface antigen and a protein synthesis DNA link are inoculated in a plasmid vector. The vaccine can be used for preventing hepatitis B, and can be used for treating chronic hepatitis B, and is a safe, economical and effective therapeutic vaccine. The preparing method provided by the present invention has the advantages of simple technology, low cost and high quality of the prepared vaccine, and the vaccine is suitable for mass production.
Description
The present invention relates to a kind of novel hepatitis B vaccine and preparation method thereof, relate to a kind of curative vaccinum for hepatitis B based on plasmid deoxyribonucleic acid (DNA) and preparation method thereof definitely.
It is to propagate the most a kind of human viral infection that hepatitis B virus (abbreviation hepatitis B virus) infects.The whole world has 300,000,000 chronic infection patients approximately, and also have an appointment every year according to estimates 20,000,000 new cases (Davis, H.L, Michel, M-L﹠amp; Whalen, R.G.1993, Hum, Mol.Genet.2:1847-1851).Most hepatitis B virus infections occur in Asia and African country.In the certain areas, Southeast Asia, hepatitis B virus carriers is up to total population 10 to 20 (Gust, I.D.1982, in ViralHepatitis, eds.Szmuness, W., Alter, H.J.andMaynard, J.E. (Franklin Institute Press, Philadelphia), P 129; Davis, 1993).
Hepatitis B virus infection is one of acute hepatitis morbidity main pathogen.The feature of hepatitis B be hepatocyte injury and inflammatory reaction (Redecker, A.G.1975, Am.J.Med.Sci.270:9-16).The constitutional hepatitis B virus infection is self limiting normally, and virus antigen is removed thereupon, nearly 10 patient produce persistent infection (Ganem, D.1982, Rev.Infect.Dis.4:1026-47).Persistence is that chronic hbv-infection can cause liver cirrhosis, eventually to liver failure and other serious consequences.Epidemiological study shows, chronic hbv-infection and primary hepatocyte hepatocarcinoma have closely dependency (Blumberg, B.S.et.al., 1971, in Australian Antigenand Hepatitis (CRC, Cleveland, OH); Beasley, R.P.et, al., 1981, Lancet 2:1129-1133).The primary hepatocyte hepatocarcinoma sickness rate of chronic viral hepatitis B virus carrier is more than 100 times (Beasley, 1981) of non-carrier.In Southeast Asia and some hepatitis B hotspots in Africa, primary hepatocyte hepatocarcinoma is the first cause of disease that causes death.For example, the primary hepatocyte hepatocarcinoma fatality rate is 20 percent (Chen, D-S, 1987, inOkada, K.﹠amp of the whole cancer fatality rate in Taiwan; Lshak, K.eds.Neoplasms of Liver, (Springer Verlag, Berlin)).In the main consequence of hepatitis B virus infection, liver cirrhosis and primary hepatocyte hepatocarcinoma harm are maximum.
Although countries in the world are to seek effectively to prevent and treat the hepatitis b virus infected huge man power and material that dropped into, still there is not an ideal therapeutic scheme can cure the patient of hepatitis B virus infection so far.Therefore, be to make people to exempt the misery that infects hepatitis B virus, exploiting economy and effective therapeutic hepatitis B vaccine is a global great and urgent task, this task seems even more important for Asia and Africa developing country.
At present, have two class Hepatitis B virus vaccines to enter clinical practice in that the U.S. is known, these two kinds of vaccines all contain hepatitis B surface antigen (other antigens or the cAg that do not contain hepatitis B).One of them is to extract in the blood plasma by chronic viral hepatitis B virus carrier, through the HBsAg of formalin deactivation (Maupas, P., Goudeau, A., Coursaget, P.﹠amp; Drucker.J.1976, Lancet 1:1367-1370).This vaccine proves it is safely and effectively basically through using.Another kind is to express the recombination hepatitis B surface antigen (Valenzuela, P.et.al., 1982, Nature (London) 298:347-82) of purifying from yeast, to preceding a kind of similar safety and effectiveness that has.The protective rate of these two kinds of vaccines in healthy population can reach 90 percent, but only reaches about protective rate of 50 percent (Pead, P.J, et.al., 1985, Lancet1:152 in immunosuppressant patient (as kidney dialysis, organ transplantation patient etc.); Wiederman, G.et.al., 1987, Vaccine 5:179-84).Above-mentioned these the two kinds of vaccines of what is more important are protein, need purification from blood plasma or recombinant yeast.Since the process complexity of protein purification, and raw material is limited, production cost is too expensive, adds that the protein biological product need freezing preservation, and the biological activity time limit is shorter, has so just limited these Hepatitis B virus vaccines being extensive use of in developing country greatly.
In recent years, because that blood plasma product is not only originated is limited, and this vaccine has band infectious viral particle contamination of heavy, about ten thousand/ the people that inoculated therefore be injured, thereby obtain hepatitis B virus infection and become the new source of infection.People also increase day by day to the concern of other possible pathogen contamination (as HIV (human immunodeficiency virus) or other not clear and definite as yet new pathogen) simultaneously, and therefore, people are exploring other approach of producing Hepatitis B virus vaccine.Escherichia coli, yeast, cells of mamma animals be all tested to be used for expressing antigen of hepatitis B virus, does not have infectious new subunit vaccine in the hope of producing.But up to now, hepatitis B virus surface antigen can't can only be expressed (Dubois, M.F.et, al, 1980, Proc, natl.Acad Sci.USA77:209-217 effectively escherichia coli in eukaryotic cell; Moriarty, A.M.et.al., 1981, Proc, natl.Acad.Sci.USA78:2606-71; Wang, Y.et.al., 1982, The EMBO Journal 1:1213; Gough, N.﹠amp; Murray, K.1983, J, Mol.Biol.162:43-48).Mammalian cell also can be used for expressing hepatitis B surface antigen, but might have virus, activatory oncogene and other activation factors or the human pathogen of not recognizing as yet.And the purge process of yeast expressed hepatitis B surface antigen needs cell lysis, thereby the cost of this production of vaccine is higher.The main cause that existing Hepatitis B virus vaccine can't be used widely in the higher developing country of sickness rate is inconvenient in production of vaccine cost height and storage.
In addition, above-mentioned two kinds of existing Hepatitis B virus vaccines all need multiple injection just can reach immune effect, and these two kinds of vaccines are to the readily good therapeutic effect of slow virus carrier simultaneously.
Thereby, the objective of the invention is in order to overcome the existing shortcoming of above-mentioned existing vaccine, provide a kind of safe and reliable, stable performance, preparation easy, be easy to the novel therapeutic hepatitis B vaccine storing and be convenient to use.
In addition, another object of the present invention is to provide a kind of method for preparing this vaccine in order to prepare above-mentioned novel therapeutic vaccine, the vaccine quality height that this method production cost is low, technology simple, produce.
The present inventor is according to past 15 years left and right sides development of molecular biology, to the understanding of mammalian cell gene expression regulation and to the molecular structure and the immunoreactive understanding of hepatitis B virus, through long term test research, reached above-mentioned purpose finally.
The invention provides a kind of novel hepatitis B vaccine, this vaccine connects into plasmid vector with the DNA that contains coding hepatitis B virus surface antigen polypeptide (Pre S polypeptide and complete HBsAg) and constitutes.Described plasmid vector contains the (Maniatis from the human cytomegalovirus, T, et.al, 1982, MolecularCloning, A LaboratoryManual (Cold Spring Harbor Laboratory)) mammalian cell transcripting promoter and enhancer, and have ribonucleic acid critical sequences, DNA in mammalian cells duplicate boot sequence and have can the enhance immunity effect antibiotic select gene (as anti-ampicillin gene).Wherein transcripting promoter and enhancer make that in proper order hbsag gene is efficiently transcribed, and the ribonucleic acid critical sequences makes the unlikely cracking of hepatitis B surface antigen Messenger RNA of transcribing.Mammalian DNA duplicates starting sequence makes plasmid to duplicate in zooblast, thereby reaches more high expressed effect.E. coli dna duplicates starting sequence and antibiotic selects gene (as anti-ampicillin gene) then to make plasmid be able to duplicate amplification in escherichia coli and make a large amount of purification DNA become possibility.This anti-ampicillin gene also has the sequence of energy enhance immunity effect simultaneously, thereby can produce the immunoreation of protective effect behind animal and human injection.
Include [Pre S1], [Pre S2] and [HBsAg] three kinds of different components among the DNA of above-mentioned vaccine plasmid, its nucleotide sequence is listed in the back of this description.
Above-mentioned vaccine plasmid is the circular plasmids of total length 6,600 base pairs, produces two fragments that are respectively 6,200 and 400 base pairs behind the BamHI digestion with restriction enzyme.
Above-mentioned vaccine is a white powder, is dissolved in being colourless transparent liquid behind the normal saline, is used for Intradermal or intramuscular injection.This vaccine character is stable, can be room temperature preservation at least three years.
Compare with existing Hepatitis B virus vaccine, new generation vaccine of the present invention not only can be used for preventing hepatitis B virus infection, and can be used for treating the slow virus carrier, therefore can reach higher protective rate; It is fairly simple and production cost is lower to produce this new generation vaccine technology; Preserve easy (not needing cryopreservation).
Vaccine of the present invention is used in human body will be fool proof, and it be the reasons are as follows:
1, the carrier each several part of used structure vaccine is applied to patient (Conry, RM safely in the clinical trial of the gene therapy of European and American countries; LoBuglio, AF ﹠amp; Curiel, DT.1996, Seminars in oncology 23:135-147).
2, the hepatitis B virus surface antigen gene has been used for the production currently available vaccines, existing vaccines, and currently available vaccines, existing vaccines is used in whole world millions of people safely.Vaccine of the present invention only contains the surface antigen gene in the hepatitis B virus gene group, and does not contain other hepatitis B virus genes.On the contrary, the still extensive serum vaccine that uses of China contains the virion of deactivation now, promptly contains complete hepatitis B virus gene group.Therefore, from this point, vaccine of the present invention can not produce because contain the virion that is not inactivated on a small quantity cause about ten thousand/ the vaccinate danger of hepatitis B virus infection takes place.
3, vaccine of the present invention is the vaccine based on DNA (deoxyribonucleic acid), only contains the hepatitis B virus surface antigen gene, and does not contain complete hepatitis B virus gene group, does not particularly have the gene that may mediate integration.And the approach that uses of vaccine is intramuscular injection, and normal muscle cell division and proliferation no longer.Therefore it is extremely small that this vaccine causes the probability of the side effect that causes because DNA (deoxyribonucleic acid) integrates.
4, a large amount of zoopery and clinical trials still find no the ill effect that any other reason causes.Our zoopery proves, in 90 days, vaccine DNA only can be detected in muscle after the intramuscular injection, and in its hetero-organization, use very sensitive DNA polymerase chain reaction,PCR also detect less than.After 180 days vaccine DNA in any tissue, all detect less than.Therefore vaccine of the present invention had not both had acutely or subacute, did not have chronic toxicity yet.As mentioned above, this vaccine than the contained viral gene of haematogenous vaccine still less, thereby possible side effect will be littler.
Hepatitis B virus vaccine of the present invention can not only produce the surface antigen polypeptide, and produces the front surface antigenic polypeptide, and therefore this Hepatitis B virus vaccine can be induced the immunoreation that produces antibody, induces the cell effect of protectiveness again.Thereby produce higher protection efficient.This advantage of novel vaccine also makes this vaccine can be used for chronic persistence and chronic active hepatitis patient, to help removing virus in these patient bodies.
In addition, the present invention also provides a kind of process for preparing above-mentioned Hepatitis B virus vaccine, and the concrete structure and the preparation process of this method are as follows:
1, plasmid construction: from the hepatitis B patients serum, extract hepatitis B virus (HBV) DNA, use the DNA polymerase chain reaction,PCR, with complete front surface antigenic (Pre S) and surface antigen (HBsAg) genetic fragment, after the Klenow enzyme reaction, constitute vaccine plasmid (PWR) DNA with the T4DNA ligase with the Eco RV site that tack connects into plasmid vector, wherein, the characteristic of the contained various components of used plasmid vector and used front surface antigenic and surface antigen gene sequence and vaccine plasmid as mentioned above.
2, vaccine production: with the plasmid DNA transformed into escherichia coli cell that is built into, in the escherichia coli culture fluid that contains ampicillin (50-300ug/ml), breeding contains the escherichia coli of plasmid DNA, after 30-40 ℃ of cultivation in 8-24 hour, (per minute 4,000 changes with centrifugal method, 4 ℃, 15 minutes) collect Bacillus coli cells, remove supernatant, with escherichia coli with alkaline bleach liquor cleavage (1% SDS, 0.2MNaOH, after 15 minutes) afterwards, remove DNA of bacteria and protein, through ion exchange, behind phenol extracting and the ethanol precipitation, obtain the high-purity plasmid DNA.
The above-mentioned method technology for preparing curative vaccinum for hepatitis B of the present invention is simple, and production cost is lower.Because this method is not traditional Cscl-bromine second pyridine method, thereby the plasmid DNA of being extracted does not contain the carcinogenic or mutagenic chemical substance of any possibility.To be used for animal or human's body injection be safe and reliable to the plasmid DNA of being extracted in this way.In addition, the used vaccine raw material of the inventive method is not to be with the particulate blood plasma of infectious hepatitis B virus, thereby can not propagate and work the mischief.Resulting plasmid DNA can be identified with gel electrophoresis method with behind the BamHI restriction enzyme reaction.Preparation technology is simple in this way, good reproducibility.The applicant has prepared 120 batch samples, all obtains good result.
Following embodiment will further specify curative vaccinum for hepatitis B of the present invention and prepare the method for this vaccine.
Embodiment 1
The 1000ml culture fluid 37 ℃ cultivate 14 hours after, per minute 4000 changes on Beckman J6 centrifuge, 15 minutes centrifugal after, remove supernatant, collect thalline, be dissolved in 10mMTris and 2mMEDTA solution after, use 1%SDS+0.2MNaOH cracking thalline.With among the 3MKOACpH4.0 and after, pass through ion exchange column.Use buffer solution elution DNA, the phenol extracting adds NaCl to 0.1M, adds the long-pending ethanol of diploid Beckman J6 centrifuge again, and per minute 4000 changes, and after centrifugal 15 minutes, obtains white precipitate, is dissolved in the deionization sterilized water.Through spectrophotometric determination OD260/OD280=1.80 altogether the high-purity plasmid DNA of 1200 micrograms.
Embodiment 2
The 1200ml culture fluid, through 36 ℃ cultivate 16 hours after, centrifugal and other preparation process with
Embodiment 1.
Obtain 20000 microgram high-purity plasmid DNA, spectrophotometric determination OD260/OD280=1.82.
It is as follows to sum up ten secondary preparation experiment results
Show as follows:
Embodiment 3
| Antibacterial culturing volume (milliliter) | Cultivation temperature (℃) | Incubation time (hour) | Yield plasmid (microgram) | Plasmid purity index | ||||
| OD260/O D280 | RNA (mg/mg plasmid) | Protein (mg/mg plasmid) | GDNA (mg/mg plasmid) | Fat Huang (1000EU/m g plasmid) | ||||
| 500-3000 | 30-40 | 8- 24 | 100- 5000 | 1.80± 0.05 | 0.09± 0.03 | 0.06± 0.03 | 0.06± 0.01 | 9.0± 6.2 |
Vaccine uses and zoopery
The plasmid DNA of purification is dissolved in the normal saline.Select for use white mice to do intramuscular injection or the skin and flesh injection of root of the tail portion.Experiment immunization effect stability and obviously repeatedly.
(1) injected dose 20-150mg/ only
(2) injecting method: injection of root of the tail skin and flesh or intramuscular injection; A shot or multiple injection (be every month once, inject the 2-4 month continuously).
(3) effect observation; Get determination of serum hbs antigen (HBsAg) or hepatitis B surface antibody (HBs antibody) before the injection and after the injection.
The HBsAg AUSZYME test kit of Abott company, reference reagent box description is carried out.
HBSAg detects with anti-Mus second antibody with the AUSAB test kit of Abott company, is contrast with the standard serum.
Now the result with three experiments (single intramuscular injection) is summarized as follows:
Mice is divided into five groups (A=SAg, B=preS1, C=PMS, D=PMsa, E=carriers), 30 every group.After ether is slightly anaesthetized, in tibialis anterior meat, inject the corresponding vaccine plasmid DNA that is dissolved in normal saline, each side inject 50 microlitres (containing 100 micrograms of DNA altogether).Two weeks after the intramuscular injection, all around, six weeks, eight weeks, the blood sampling of 12 weeks, survey serum HBsAg content with method described above, three times experimental result shows, two weeks after the intramuscular injection, can detect HBsg content in the mice serum, three times experimental result shows, in two weeks after the intramuscular injection, can detect HBsAg in the mice serum up to 0.6mg/ml.HBsAg expresses and may persist to for the 8th week.Around after the intramuscular injection, eight weeks, 12 week blood samplings; survey serum HBs antibody content with said method; three times experimental result shows; around after the single vaccine injection; can detect HBs antibody in 93 percent the mice serum; eight weeks of antibody horizontal to the can reach 100mlU/mL, and internationally recognized protection antibody level is 10mlU/mL.These presentation of results, this vaccine can produce good antibody response in mice, and antibody titer reaches the protection level.
：ATGGGAGGTTGGTCATCCAAACCTCGCAAAGGCATGGGGACGAACCTTTCTGTTCCCAACCCTCTGGGATTCTTTCCCGATCATCAGTTGGACCCTGCATTCGGAGCCAACTCAAACAATCCAGATTGGGACTTCAACCCCATCAAGAACCACTGGCCAGCAGCCAACCAGGTAGGAGTGGGAGCATTCGGGCCAAGGCTCACCCCTCCACACGGCGGTATTTTGGGGTGGAGCCCTCAGGCTCAGGGCATATTGACCACAGTGTCAACAATTCCTCCTCCTGCCTCCACCAATCGGCAGTCAGGAAGGCAGCCTACTCCCATCTCTCCACCTCTAAGAGACAGTCATCCTCAGGCCATGCAGTGGAATTCCACTGCCTTCCACCAAGCTCTGCAGGATCCCAGAGTCAGGGGTCTGTATCTTCCTGCTGGTGGCTCCAGTTCAGGAACAGTAAACCCTGCTCCGAATATTGCCTCTCACATCTCGTCAATCTCCGCGAGGACTGGGGACCCTGTGGCGAACATGGAGAACATCACATCAGGATTCCTAGGACCCCTGCTCGTGTTACAGGCGGGGTTTTTCTTGTTGACAAGAATCCTCACAATACCGCAGAGTCTAGACTCGTGGTGGACTTCTCTCAATTTTCTAGGGGGATCACCCGTGTGTCTTGGCCAAAATTCGCAGTCCCCAACCTCCAATCACTCACCAACCTCCTGTCCTCCAATTTGTCCTGGTTATCGTTGGATGTGTCTGCGGCGTTTTATCATATTCCTCTTCATCCTGCTGCTATGCCTCATCTTCTTATTGGTTCTTCTGGATTATCAAGGTATGTTGCCCGTTTGTCCTCTAATTCCAGGATCAACAACAACCAGTACGGGACCATGCAAAACCTGCACGACTCCTGCTCAAGGCAACTCTATGTTTCCCTCATGTTGCTGTACAAAACCTACGGATGGAAATTGCACCTGTATTCCCATCCCATCGTCCTGGGCTTTCGCAAAATACCTATGGGAGTGGGCCTCAGTCCGTTTCTCTTGGCTCAGTTTACTAGTGCCATTTGTTCAGTGGTTCGTAGGGCTTTCCCCCACTGTTTGGCTTTCAGCAATATGGATGATGTGGTATTGGGGGCCAAGTCTGTACAGCATCGTGAGTCCCTTTATACCGCTGTTACCAATTTTCTTATGTCTCTGGGTATACATTTAA
Claims (5)
1, a kind of hepatitis B vaccine; Described vaccine connects into plasmid vector with the DNA that contains coding hepatitis b virus s antigen polypeptide and consists of; It is characterized in that described DNA includes [PreS1], [PreS2] and [HBsAg] three kinds of different components; ：ATGGGAGGTTGGTCATCCAAACCTCGCAAAGGCATGGGGACGAACCTTTCTGTTCCCAACCCTCTGGGATTCTTTCCCGATCATCAGTTGGACCCTGCATTCGGAGCCAACTCAAACAATCCAGATTGGGACTTCAACCCCATCAAGAACCACTGGCCAGCAGCCAACCAGGTAGGAGTGGGAGCATTCGGGCCAAGGCTCACCCCTCCACACGGCGGTATTTTGGGGTGGAGCCCTCAGGCTCAGGGCATATTGACCACAGTGTCAACAATTCCTCCTCCTGCCTCCACCAATCGGCAGTCAGGAAGGCAGCCTACTCCCATCTCTCCACCTCTAAGAGACAGTCATCCTCAGGCCATGCAGTGGAATTCCACTGCCTTCCACCAAGCTCTGCAGGATCCCAGAGTCAGGGGTCTGTATCTTCCTGCTGGTGGCTCCAGTTCAGGAACAGTAAACCCTGCTCCGAATATTGCCTCTCACATCTCGTCAATCTCCGCGAGGACTGGGGACCCTGTGGCGAACATGGAGAACATCACATCAGGATTCCTAGGACCCCTGCTCGTGTTACAGGCGGGGTTTTTCTTGTTGACAAGAATCCTCACAATACCGCAGAGTCTAGACTCGTGGTGGACTTCTCTCAATTTTCTAGGGGGATCACCCGTGTGTCTTGGCCAAAATTCGCAGTCCCCAACCTCCAATCACTCACCAACCTCCTGTCCTCCAATTTGTCCTGGTTATCGTTGGATGTGTCTGCGGCGTTTTATCATATTCCTCTTCATCCTGCTGCTATGCCTCATCTTCTTATTGGTTCTTCTGGATTATCAAGGTATGTTGCCCGTTTGTCCTCTAATTCCAGGATCAACAACAACCAGTACGGGACCATGCAAAACCTGCACGACTCCTGCTCAAGGCAACTCTATGTTTCCCTCATGTTGCTGTACAAAACCTACGGATGGAAATTGCACCTGTATTCCCATCCCATCGTCCTGGGCTTTCGCAAAATACCTATGGGAGTGGGCCTCAGTCCGTTTCTCTTGGCTCAGTTTACTAGTGCCATTTGTTCAGTGGTTCGTAGGGCTTTCCCCCACTGTTTGGCTTTCAGCAATATGGATGATGTGGTATTGGGGGCCAAGTCTGTACAGCATCGTGAGTCCCTTTATACCGCTGTTACCAATTTTCTTATGTCTCTGGGTATACATTTAA； Behind the BamHI digestion with restriction enzyme, produce two fragments that are respectively 6,200 and 400 base-pairs
Described plasmid vector contains mammalian cell transcripting promoter and the enhancer from the human cytomegalovirus, and have the ribonucleic acid critical sequences, DNA in mammalian cells is duplicated boot sequence, e. coli dna duplicates boot sequence and antibiotic and selects gene.
2, the described vaccine of claim 1 is characterized in that it is anti-ampicillin gene that described antibiotic is selected gene.
3, a kind of method for preparing the described hepatitis B vaccine of claim 1 is characterized in that the concrete structure and the preparation process of described method is as follows:
(1) plasmid construction: from the hepatitis B patients serum, extract hepatitis B virus DNA, use the DNA polymerase chain reaction,PCR, with complete front surface antigenic and surface antigen gene fragment, after the Klenow enzyme reaction, constitute the vaccine plasmid DNA with the T4DNA ligase with the EcoRV site that tack connects into the plasmid site
(2) vaccine production: with the plasmid DNA transformed into escherichia coli cell that is built into, in containing the escherichia coli culture fluid of 50-300ug/ml ampicillin, breeding contains the escherichia coli of plasmid DNA, after 30-40 ℃ of cultivation in 8-24 hour, collect Bacillus coli cells with centrifugal method, remove supernatant, with escherichia coli with alkaline bleach liquor cleavage after, remove DNA of bacteria and protein, after ion exchange, phenol extracting and ethanol precipitation, obtain the high-purity plasmid DNA.
4, the described method of claim 3, the condition that it is characterized in that described centrifugal method is per minute 4,000 commentaries on classics, in 4 ℃, through 15 minutes.
5, the described method of claim 3, the actual conditions that it is characterized in that described alkaline bleach liquor cleavage is to use 1%SDS, 0.2MNaOH was through 15 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98117171A CN1081069C (en) | 1998-08-14 | 1998-08-14 | Curative vaccinum for hepatitis B and preparing method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98117171A CN1081069C (en) | 1998-08-14 | 1998-08-14 | Curative vaccinum for hepatitis B and preparing method therefor |
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| Publication Number | Publication Date |
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| CN1209340A CN1209340A (en) | 1999-03-03 |
| CN1081069C true CN1081069C (en) | 2002-03-20 |
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| CN98117171A Expired - Fee Related CN1081069C (en) | 1998-08-14 | 1998-08-14 | Curative vaccinum for hepatitis B and preparing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1733798B (en) * | 2005-08-12 | 2012-07-04 | 上海贺普生物科技有限公司 | Hepatitis B virus surface L protein related peptide |
| CN102675430B (en) * | 2005-08-12 | 2014-08-27 | 上海贺普药业股份有限公司 | Hepatitis B virus surface L protein related peptide |
| CR20190207A (en) * | 2011-04-21 | 2019-06-26 | Ionis Pharmaceuticals Inc | Modulation of hepatitis b virus (hbv) expression |
| CN114107393A (en) | 2021-04-07 | 2022-03-01 | 上海劲威生物科技有限公司 | Lentiviral vector and lentiviral particle for treating hepatitis B as well as preparation methods and applications of lentiviral vector and lentiviral particle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0038765A1 (en) * | 1980-04-22 | 1981-10-28 | Institut Pasteur | Vaccine against viral hepatitis B, method and transformed eucaryotic cells for the preparation of this vaccine |
| EP0244924A1 (en) * | 1986-01-31 | 1987-11-11 | Merck & Co. Inc. | Production of vaccines against Hepatitis B virus |
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1998
- 1998-08-14 CN CN98117171A patent/CN1081069C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0038765A1 (en) * | 1980-04-22 | 1981-10-28 | Institut Pasteur | Vaccine against viral hepatitis B, method and transformed eucaryotic cells for the preparation of this vaccine |
| EP0244924A1 (en) * | 1986-01-31 | 1987-11-11 | Merck & Co. Inc. | Production of vaccines against Hepatitis B virus |
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