WO2022015124A1 - 중증급성호흡기증후군 코로나바이러스 2 감염 예방용 백신 조성물 - Google Patents
중증급성호흡기증후군 코로나바이러스 2 감염 예방용 백신 조성물 Download PDFInfo
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- WO2022015124A1 WO2022015124A1 PCT/KR2021/009290 KR2021009290W WO2022015124A1 WO 2022015124 A1 WO2022015124 A1 WO 2022015124A1 KR 2021009290 W KR2021009290 W KR 2021009290W WO 2022015124 A1 WO2022015124 A1 WO 2022015124A1
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Definitions
- the present invention relates to a vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection.
- Coronavirus disease-19 is a respiratory infection caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
- SARS-CoV-2 is a novel single-stranded RNA beta-coronavirus newly discovered in Wuhan, China on December 23, 2019, and was named SARS-CoV-2 by the International Commission on Virus Classification in January 2020. Although the route of SARS-CoV-2 infection has not yet been clearly identified, some studies have reported that it is transmitted from bats to humans.
- the genome of SARS-CoV-2 is non-segmented and about 30 kb in size encodes 10 proteins.
- the ten proteins consist of one replicating polyprotein (open reading frames 1ab), four structural proteins (Spike, envelope, membrane and nucleocapsid), and five non-structural proteins (open reading frames 3a, 6, 7a, 8 and 10). Consists of.
- SARS-CoV-2 can be transmitted from person to person and has a fairly high mortality rate, so it is a big problem both at home and abroad.
- 167,511 cases occurred, of which 13,908 deaths were reported to the WHO, and the number of deaths is rapidly increasing even now.
- SARS-CoV-2 Since its first discovery in China in 2019, SARS-CoV-2, which has been intensively transmitted in China, has been infected in more than 160 countries, including Korea, Japan, and Italy in 2020, and has a high transmission rate. There is a problem accompanying complications such as acute renal failure, and it is causing a big problem due to the high mortality rate and contagiousness.
- the present inventors have completed the present invention by developing a DNA vaccine expressing Spike and ORF3a or nucleocapsid as a result of efforts to develop a vaccine for preventing severe acute respiratory syndrome coronavirus 2 infection.
- an object of the present invention is, (a) a SARS-CoV-2 Spike protein or a gene encoding the same and (b) a SARS-CoV-2 ORF3a protein or a gene encoding the same; Or SARS-CoV-2 nucleocapsid or a gene encoding it; to provide a vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection, including.
- Another object of the present invention (a) SARS-CoV-2 Spike protein or a gene encoding the same and (b) SARS-CoV-2 ORF3a protein or a gene encoding the same; Or SARS-CoV-2 nucleocapsid or a gene encoding the same; to provide an immunogenic composition containing, severe acute respiratory syndrome coronavirus 2
- Another object of the present invention (a) a gene encoding SARS-CoV-2 Spike protein and (b) a gene encoding SARS-CoV-2 ORF3a protein; Or a gene encoding the SARS-CoV-2 nucleocapsid protein; to provide a bicistronic expression cassette comprising.
- Another object of the present invention is to provide a vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection comprising the bicistronic expression cassette.
- Another object of the present invention is to provide an immunogenic composition for preventing severe acute respiratory syndrome coronavirus 2 infection comprising the bicistronic expression cassette.
- Another object of the present invention is to provide a method for preventing severe acute respiratory syndrome coronavirus 2 infection, comprising the step of treating the bicistronic expression cassette to the subject.
- the present invention provides (a) SARS-CoV-2 Spike protein or a gene encoding the same and (b) SARS-CoV-2 ORF3a protein or a gene encoding the same; Or SARS-CoV-2 nucleocapsid or a gene encoding it; provides a vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection, including.
- the present invention provides (a) SARS-CoV-2 Spike protein or a gene encoding the same and (b) SARS-CoV-2 ORF3a protein or a gene encoding the same; Or SARS-CoV-2 nucleocapsid or a gene encoding the same; it provides a, severe acute respiratory syndrome coronavirus 2 immunogenic composition comprising.
- the present invention provides (a) a gene encoding SARS-CoV-2 Spike protein and (b) a gene encoding SARS-CoV-2 ORF3a protein; Or a gene encoding the SARS-CoV-2 nucleocapsid protein; provides a bicistronic expression cassette comprising.
- the present invention also provides a vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection comprising the bicistronic expression cassette.
- the present invention also provides an immunogenic composition for preventing severe acute respiratory syndrome coronavirus 2 infection comprising the bicistronic expression cassette.
- the present invention also provides a method for preventing severe acute respiratory syndrome coronavirus 2 infection, comprising the step of treating the bicistronic expression cassette to the subject.
- the vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection includes Spike and ORF3a or nucleocapsid as antigens for SARS-CoV-2.
- the vaccine composition has a significant antibody immune response and T-cell immune response induction effect by a plurality of co-expressed antigens compared to containing one antigen, and is widely used in the field of preventing severe acute respiratory syndrome coronavirus 2 infection can be
- 1A is a diagram showing a cleavage map of plasmid pGO-1002 containing genes encoding antigen Spike and ORF3a according to the present invention.
- Figure 1b is a diagram showing the mechanism of post-translational modification of the peptide expressed by the plasmid pGO-1002.
- Figure 2a is a diagram showing the result of confirming the generation of antigen Spike and OPF3a protein in cells transfected with the plasmid pGO-1002 through Western blotting.
- Figure 2b is a diagram showing the result of confirming the generation of antigen Spike and OPF3a protein in the cells transfected with the plasmid pGO-1002 through immunofluorescence staining.
- FIG. 3 is a diagram showing the results of evaluating the toxicity of the plasmid pGO-1002 according to the present invention in vivo.
- FIG. 4 is a diagram showing the results of measuring the titer of the Spike antigen-specific binding antibody through the antibody immune response.
- FIG. 5 is a diagram showing the results of measuring the titer of the ORF3a antigen-specific binding antibody through the antibody immune response.
- FIG. 6 is a diagram showing the results of evaluating the T-cell immune response of spleen cells stimulated with Spike OLP through ELISpot analysis.
- FIG. 7 is a diagram showing the results of evaluating the T cell immune response of spleen cells stimulated with ORF3a OLP through ELISpot analysis.
- FIG. 8 is a diagram showing the results of evaluating the T cell immune response of spleen cells stimulated with Spike OLP and ORF3a OLP through ELISpot analysis.
- 9 and 10 are diagrams showing the results of evaluating the neutralizing antibody titer through a plaque reduction neutralization assay.
- FIG. 11 is a diagram showing the results of confirming the competitive binding ability with the ACE protein through the ACE receptor competition evaluation.
- the present invention provides (a) a SARS-CoV-2 Spike protein or a gene encoding the same and (b) a SARS-CoV-2 ORF3a protein or a gene encoding the same; Or SARS-CoV-2 nucleocapsid or a gene encoding it; provides a vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection and a severe acute respiratory syndrome coronavirus 2 immunogenic composition, including.
- the gene encoding the Spike, ORF3a or nucleocapsid protein is preferably optimized with a human codon.
- Spike refers to a multifunctional protein that mediates the entry of coronavirus into host cells
- the Spike of SARS-CoV-2 consists of 1273 amino acids (Genebank Accession No. YP_009724390.1).
- the virus removal effect ie, sterilization effect
- MERS-CoV which is the same coronavirus
- the gene encoding the Spike protein is optimized with human codons, and is preferably represented by the nucleotide sequence of SEQ ID NO: 1 or 3.
- ORF3a (open reading frame 3a) is the largest accessory protein in SARS-CoV-2, and consists of 275 amino acids (Genebank Accession No. YP_009724391.1).
- the ORF3a is a protein involved in internalization of SARS-CoV-2 during endocytosis.
- an open reading frame is an amino acid sequence and refers to a DNA nucleotide sequence to be translated.
- the gene encoding the ORF3a protein is optimized with a human codon, and is preferably represented by the nucleotide sequence of SEQ ID NO: 2.
- nucleocapsid refers to a protein structure containing RNA or DNA, which is genetic information of a virus, inside.
- the nucleocapsid consists of a sequence of 419 amino acids (Genebank Accession No. YP_009724397.2).
- the gene encoding the nucleocapsid protein is optimized with human codons, and is preferably represented by the nucleotide sequence of SEQ ID NO: 4.
- a gene encoding a Spike protein is preferably contained in a bicistronic expression vector, but is not limited thereto.
- a vaccine is a drug that imparts acquired immunity to an antigen, and is administered for the purpose of inducing specific and active immunity to SARS-CoV-2.
- composition of the present invention may include one or more adjuvants or excipients or carriers suitable for constituting the composition.
- the adjuvant that may be included in the composition of the present invention refers to a substance that enhances the immune response of an injected animal, and a number of different adjuvants are known to those skilled in the art.
- the immune adjuvant includes Freund's complete and incomplete immune enhancers, vitamin E, nonionic blocking polymer, muramyl dipeptide, Quil A, mineral oil and non-mineral oil and Carbopol, water-in-oil type emulsion adjuvant, and the like. it is not going to be
- excipients examples include aluminum phosphate, aluminum hydroxide, aluminum potassium sulfate, and the like.
- the carrier that may be included in the composition of the present invention may be a pharmaceutically acceptable carrier, and examples of the pharmaceutically acceptable carrier include saline, sterile water, Ringer's solution, buffered saline, dextrose solution, maltodextrin solution, glycerol. , ethanol, and the like.
- composition of the present invention may further comprise preservatives and other additives such as, for example, antimicrobial agents, antioxidants, chelating agents, inert gases, and the like.
- the preservatives include formalin, thimerosal, neomycin, polymyxin B and amphotericin B, and the like.
- the compositions of the present invention may comprise one or more suitable emulsifiers, such as Span or Tween.
- the composition of the present invention may include a protective agent, and any protective agent known in the art can be used without limitation, which may include lactose (Lactose; LPGG) or trehalose (Trehalose; TPGG). It is not limited.
- the composition is preferably for two administrations, and more preferably for two administrations at an interval of two weeks.
- the composition comprises (a) a Spike protein; and (b) ORF3a or nucleocapsid protein; preferably, simultaneously induce immunogenicity.
- the composition induces an antibody response and a T-cell immune response at the same time.
- the present invention provides (a) a gene encoding a SARS-CoV-2 Spike protein and (b) a gene encoding a SARS-CoV-2 ORF3a protein; Or a gene encoding the SARS-CoV-2 nucleocapsid protein; provides a bicistronic expression cassette comprising.
- the present invention provides a vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection, and an immunogenic composition for preventing severe acute respiratory syndrome coronavirus 2 infection, comprising a bicistronic expression cassette.
- the gene encoding the Spike protein is preferably optimized with a human codon, and more preferably, the signal peptide unique to SARS-CoV-2 is replaced with an IgE leader sequence it is preferable to have
- the gene encoding the Spike protein may be represented by the nucleotide sequence of SEQ ID NO: 1 or 3.
- the gene encoding the ORF3a protein is preferably optimized with a human codon, and more preferably an IgE leader sequence is added.
- the gene encoding the ORF3a protein may be represented by the nucleotide sequence of SEQ ID NO: 2.
- the gene encoding the nucleocapsid protein is preferably optimized with a human codon, and more preferably an IgE leader sequence is added.
- the gene encoding the nucleocapsid protein may be represented by the nucleotide sequence of SEQ ID NO: 4.
- bicistronic refers to a system in which ribosomes can synthesize polypeptides even inside mRNA in eukaryotic cells, so that several proteins can be synthesized from one mRNA, and in the present invention (i ) Spike protein and ORF3a protein; or (ii) Spike protein and nucleocapsid protein; an expression cassette was designed so that it can be expressed simultaneously.
- the expression cassette designed so that the Spike protein and the ORF3a protein can be expressed simultaneously, the gene encoding the Spike protein represented by the nucleotide sequence of SEQ ID NO: 1; and a gene encoding the ORF3a protein represented by the nucleotide sequence of SEQ ID NO: 2;
- an expression cassette designed so that the Spike protein and the nucleocapsid protein can be expressed simultaneously, the gene encoding the Spike protein represented by the nucleotide sequence of SEQ ID NO: 3; and a gene encoding the nucelocapsid protein of SEQ ID NO: 4;
- the expression cassette includes a promoter and a gene encoding a target protein, and thus means a unit cassette that can be expressed to produce a target protein operably linked downstream of the promoter.
- the target protein expression cassette may be one in which a gene encoding the target protein is operably linked to the downstream of the promoter sequence.
- the operably linked means that the gene sequence and the promoter sequence are functionally linked so that the nucleic acid sequence having promoter activity of the present invention initiates and mediates transcription of a gene encoding a target protein.
- the operable linkage may be prepared using a genetic recombination technique known in the art, and site-specific DNA cleavage and ligation may be made using a cleavage and ligation enzyme in the art, but is not limited thereto.
- the bicistronic expression cassette contains additional components, ie, CMV promoter, Kozak sequence, IgE leader sequence, furin recognition site, GSG- It is preferable to further include one or more components selected from the group consisting of T2A cleavage site, BGH poly adenylation signal, kanamycin resistance gene, and pUC origin.
- the CMV promoter, Kozak sequence and IgE leader sequence are for inducing high-level gene expression and secretion in animal cells;
- the furin recognition site and the GSG-T2A cleavage site are for protein cleavage;
- the BGH polyadenylation signal is for efficient transcription termination and stabilization of the transcript;
- the kanamycin resistance gene is an E. coli selectable marker;
- pUC Origin is for maintaining high copy number in E. coli;
- the bicistronic expression cassette is preferably a vector, and more preferably, may be represented by the following cleavage map.
- a vector means a means for expressing a target gene in a host cell.
- Viral vectors such as, for example, plasmid vectors, adenoviral vectors, retroviral vectors and adeno-associated viral vectors are included.
- Vectors that can be used as the recombinant vector include plasmids often used in the art (eg, pGLS, pSC101, pGV1106, pACYC177, ColE1, pKT230, ME290, pBR322, pUC8/9, pUC6, pBD9, pHC79, pIJ61, pLAFR1).
- phage eg, ⁇ gt4 ⁇ B, ⁇ Charon, ⁇ z1 and M13, etc.
- viruses eg, AAV, MVA, etc.
- the recombinant vector can typically be constructed as a vector for cloning or a vector for expression.
- the expression vector may be a conventional vector used to express a foreign protein in plants, animals or microorganisms in the art.
- the recombinant vector can be constructed through various methods known in the art.
- the recombinant vector can be constructed using a prokaryotic cell or a eukaryotic cell as a host.
- the replication origin operating in the eukaryotic cell contained in the vector is the f1 origin of replication, the SV40 origin of replication, the pMB1 origin of replication, the adeno origin of replication, the AAV origin of replication, the CMV origin of replication, and the BBV origin of replication. Including, but not limited to, the origin of replication.
- promoters derived from the genome of mammalian cells eg, metallotionine promoter
- mammalian viruses eg, adenovirus late promoter, vaccinia virus 7.5K promoter, SV40 promoter, The cytomegalovirus (CMV) promoter and the tk promoter of HSV
- CMV cytomegalovirus
- tk promoter of HSV can be used and generally have a polyadenylation sequence as a transcription termination sequence.
- the composition is preferably administered 1 to 3 times at intervals of 1 to 3 weeks, and more preferably inoculated twice at intervals of 2 weeks.
- the composition may be formulated using methods known in the art to permit rapid, sustained or delayed release of the active ingredient upon administration to a mammal.
- Formulations include powders, granules, tablets, emulsions, syrups, aerosols, soft or hard gelatin capsules, sterile injectable solutions, and sterile powder forms.
- the composition may be administered by one or more routes selected from the group consisting of intramuscular, intravenous, subcutaneous, intradermal and intranasal. .
- the composition may be administered through a method of applying a physical stimulus to increase delivery efficiency during administration, examples of which include an electroporation method, a gene gun method, and a jet injection method. (Jet injection) method, etc.
- a method of applying a physical stimulus to increase delivery efficiency during administration examples of which include an electroporation method, a gene gun method, and a jet injection method. (Jet injection) method, etc.
- electroporation is a technique for introducing a chemical, drug, or DNA into a cell by increasing the permeability of the plasma membrane by applying an electric field to the cell.
- electroporation is utilized to transform bacteria, animal cells or plant cells by introducing new DNA.
- the gene gun refers to a device made to pass through a cell wall or cell membrane by attaching a recombinant plasmid to gold, tungsten, or plastic particles having a diameter of 1 to 5 ⁇ m and accelerating it at an appropriate speed.
- the delivery method using the gene gun is used to introduce a biological material into living cells.
- the jet injection method refers to a method of injecting a liquid drug under the skin by finely injecting a liquid drug at a high pressure using an injection syringe without using a needle.
- the composition is preferably administered intramuscularly via electroporation.
- the composition may be administered through a biochemical method to increase delivery efficiency, and preferably, the composition may be administered through a liposome-mediated delivery method.
- the liposome-mediated delivery method refers to a method of delivering a target substance into a cell using a liposome containing the target substance.
- composition according to the present invention may be formulated in a suitable form together with a commonly used pharmaceutically acceptable carrier.
- Pharmaceutically acceptable carriers include, for example, carriers for parenteral administration such as water, suitable oils, saline, aqueous glucose and glycol, and may further include stabilizers and preservatives. Suitable stabilizers include antioxidants such as sodium hydrogen sulfite, sodium sulfite or ascorbic acid. Suitable preservatives are benzalkonium chloride, methyl- or propyl-paraben and chlorobutanol.
- composition according to the present invention may contain a suspending agent, a solubilizing agent, a stabilizer, an isotonic agent, a preservative, an adsorption inhibitor, a surfactant, a diluent, an excipient, a pH adjuster, an analgesic agent, a buffer, Antioxidants and the like may be included as appropriate.
- the dosage of the composition to a patient will depend on many factors, including the patient's height, body surface area, age, the particular compound being administered, sex, time and route of administration, general health, and other drugs being administered concurrently.
- composition of the present invention is administered in a therapeutically effective amount.
- a therapeutically effective amount means an amount sufficient to treat a disease at a reasonable benefit/risk ratio applicable to medical treatment, and the effective dose level is defined as the subject type and severity, age, sex, drug activity, drug It can be determined according to factors including sensitivity to, administration time, administration route and excretion rate, duration of treatment, concomitant drugs, and other factors well known in the medical field.
- the composition of the present invention may be administered in an amount of 0.01 mg/60 kg to 1 g/60 kg based on a 60 kg adult. Meanwhile, the dosage may be appropriately adjusted according to the patient's age, sex, and condition.
- a bicistronic expression cassette comprising genes encoding antigen proteins Spike and ORF3a according to the present invention; or a bicistronic expression cassette comprising a gene encoding Spike and nucleocapsid; a composition comprising effectively induces an antigen-antibody immune response and a T-cell immune response, and has a neutralizing antibody and high competitive binding ability with hACE2 protein Confirmed. Therefore, the composition according to the present invention can be used in various ways in the field of preventing SARS-CoV-2 virus infection.
- the present invention provides a method for preventing severe acute respiratory syndrome coronavirus 2 infection comprising the step of treating the bicistronic expression cassette to an individual.
- the bicistronic expression cassette is preferably treated in a subject in the form of a vector containing the same, but is not limited thereto.
- the subject may be an individual at risk of being infected with Severe Acute Respiratory Syndrome Coronavirus 2 or an individual expected to be infected.
- Example 1 Candidate antigen selection and bicistronic vector design
- Candidate antigens Spike (Genebank Accession No. YP_009724390.1), ORF3a (Genebank Accession No. YP_009724391.1) and nucleocapsid (Genebank Accession No. YP_009724397.2) from the entire sequence of Wuhan-Hu-1 (Genebank Accession No. MN908947) was selected.
- ORF3a is the largest accessory protein consisting of 275 amino acids and is involved in internalization of SARS-CoV-2 during endocytosis.
- a bicistronic vector ie, a combined vaccine in the form of a DNA vaccine containing the coding gene was prepared.
- the gene encoding Spike, ORF3a or nucleocapsid used in the preparation of the bicistronic vector is a nucleotide sequence obtained by optimizing the amino acid sequence of the corresponding Accession No. with human codons.
- the signal peptide unique to SARS-CoV-2 was replaced with an IgE leader sequence
- ORF3a and nucleocapsid an IgE leader sequence was added.
- the gene encoding the Spike protein used in the preparation of the bicistronic vector is represented by the nucleotide sequence of SEQ ID NO: 1 or 3
- the gene encoding the ORF3a protein is represented by the nucleotide sequence of SEQ ID NO: 2
- encoding the nucleocapsid protein The gene is represented by the nucleotide sequence of SEQ ID NO: 4.
- a bicistronic vector comprising a gene encoding a Spike protein (SEQ ID NO: 1) and a gene encoding ORF3a (SEQ ID NO: 2) was designed, and this was performed using the plasmid pGO It was designated as -1002.
- the cleavage map of the plasmid pGO-1002 is shown in Fig. 1a.
- the peptide expressed in the cell using the plasmid pGO-1002 of FIG. 1A includes various cleavage sites such as signal peptidase and carboxypeptidase.
- the peptide expressed by the plasmid pGO-1002 is cleaved by post-translational modification as shown in FIG. 1B, and thus only Spike and ORF3a proteins are secreted during extracellular secretion.
- a bicistronic vector comprising a gene encoding a Spike protein (SEQ ID NO: 3) and a gene encoding a nucleocapsid (SEQ ID NO: 4) was designed, and the plasmid pGO It was named -1003.
- the peptide expressed in the cell includes various cleavage sites such as signal peptidase and carboxypeptidase.
- the peptide expressed by the plasmid pGO-1003 is cleaved by post-translational modification. Accordingly, only Spike and nucleocapsid proteins are secreted during extracellular secretion.
- plasmid pGLS101 was used as a negative control, and as a positive control, plasmids pGLS-Spike (pGO-1001) and pGLS-ORF3a into which one spike and one ORF3a were inserted were used as positive controls.
- the plasmid pGLS101 was derived from Invitrogen's pVAX1 plasmid (Cat. No. V26020).
- the plasmid pGO-1002 prepared in Example 1 produced antigens Spike and ORF3a proteins in the transfected cells.
- the HEK293T cell line was transfected with the plasmid pGO-1002 (pGLS-BC-nCoV-S-ORF3a_hCO). Cells were lysed 48 hours after transfection. Generation of Spike and ORF3a proteins was confirmed through SDS-PAGE and Western blotting. Antibodies used for the Western blotting are as follows.
- Spike and ORF3a protein expression was confirmed by immunofluorescence staining. Specifically, the HEK293T cell line was transfected with the plasmid pGO-1002. Transfected cells were immunofluorescently labeled 48 hours after transfection. Cell nucleus DNA was stained with DAPI and used as a control (blue panel). The staining results are shown in Figure 2b.
- the cells transfected with the bicistronic vector containing the genes encoding Spike and nucleocapsid prepared in Example 1 normally express Spike and nucleocapsid in the cells, respectively.
- the toxicity of the plasmid pGO-1002 prepared in Example 1 was evaluated.
- the cell assay evaluated toxicity by measuring the body weight change induced by antigen expression in mice immunized with plasmid pGO-1002.
- the immunized mice were intramuscularly inoculated with the plasmid pGO-1002 through electroporation inoculation, and inoculated twice with an interval of 2 weeks.
- the mice used in this example were first inoculated with the plasmid pGO-1002, and the second inoculated 15 days later.
- the negative control group was inoculated with the plasmid pGLS-101, and the positive control group was inoculated with the plasmid pGLS-ORF3a.
- the results of evaluating the toxicity of the antigen are shown in FIG. 3 .
- the experimental group showed similar weight gain to the negative and positive controls, which means that antigen Spike and nucleocapsid have low toxicity in the body.
- the ELISA plate was coated with 1 ⁇ g/ml of 1x phosphate buffered saline (PBS) containing recombinant antigen and then incubated at 4°C overnight.
- Blocking buffer (seracare, Cat.5140-0011) was added to the coated plate and incubated at 37°C for 2 hours. After incubation, the plate was washed with 1x PBS containing 5% Tween 20, and mouse serum was serially diluted and incubated at 37°C for 2 hours.
- the mouse serum was obtained from mice in which the plasmid pGO-1002 prepared in Example 1 was intramuscularly inoculated (twice at 2 week intervals) and then transferred by electroporation to mice through electroporation inoculation.
- the plate was washed with 1x PBS, and a primary antibody binding to Spike or ORF3a was added and incubated, followed by washing with 1x PBS.
- the plate was treated with a Goat anti-Mouse IgG (H+L) secondary antibody (invitrogen, Cat. 31430) (1:2,500) bound to force eadish peroxidase (HRP), and then incubated at room temperature for 1 hour. After that, the plate was washed with 1x PBS, and the plate was developed using the ABTS Peroxidase Substrate System (KPL, cat. 5120-0032), and treated with ABTS Peroxidase Stop Solution (KPL, cat. 5150-0017). The reaction was stopped. The plate was read at 405 nm in 30 minutes. A Synergy HTX (BioTek Instruments, Highland Park, VT) was used to read the plate. The cutoff value was calculated as follows.
- mice inoculated with plasmids pGLS-101 (negative control) and pGLS-Spike (positive control) were used.
- mouse serum was collected before (D0), 2 weeks (Wk2) and 4 weeks (Wk4) after plasmid inoculation.
- the titer of the Spike antigen-specific binding antibody was measured through ELISA using the collected serum and the mouse Spike-binding primary antibody. The results of measuring the titer of the Spike antigen-specific binding antibody are shown in FIG. 4 .
- test group pGLS-Spike-ORF3a
- plasmid pGO-1002 had a similar titer to the positive control group (pGLS-Spike) of the Spike antigen-specific binding antibody.
- test group pGLS-Spike-ORF3a
- pGLS-101 the test group inoculated with the plasmid pGO-1002 had significantly higher titer of the ORF3a antigen-specific binding antibody than the negative control group (pGLS-101).
- the proteins (ie, Spike and nucleocapsid) expressed by the bicistronic vector containing the genes encoding Spike and nucleocapsid prepared in Example 1 induce a sufficient immune response, respectively.
- the plasmid pGO-1002 was intramuscularly inoculated into mice through the electroporation inoculation method, and the inoculation was performed twice at an interval of 2 weeks. The mice were sacrificed to obtain a spleen.
- Single cell suspensions were prepared by individually collecting single spleen cells from mouse-derived spleens in R10 medium.
- the R10 medium refers to RPMI1640 medium supplemented with 10% FBS and penicillin/streptomycin.
- the cell suspension was centrifuged to obtain a cell pellet, and the cell pellet was resuspended in 5 ml of ACK lysis buffer (Life Technologies, cat. A1049201) and incubated for 8 minutes.
- R10 medium was added to the tube containing the cells, and then centrifuged at 1400 rpm for 5 minutes to obtain a cell pellet.
- the cell pellet was resuspended in R10 medium to prepare a cell suspension.
- the ELISpot assay was performed using mouse IFN- ⁇ ELISpotPLUS plates (MABTECH, cat. 33212H). For blocking, R10 medium was added to a 96-well ELISpot plate coated with a capture antibody, and then incubated at room temperature for 1 hour. 200,000 mouse splenocytes were plated in each well of the blocked ELISpot plate. The plated cells were stimulated with an overlapping long peptide (OLP) pool for 14 hours. Cells were stimulated with 1 ⁇ g/ml of each peptide per well in R10 medium. Spots expressed after cell stimulation were developed according to the manufacturer's manual. R10 medium and a mixture of 1% DMSO and ConA (concanavaline A) were used as negative and positive controls, respectively.
- OHP overlapping long peptide
- the OLP pool is an OLP pool derived from the Spike or ORF3a protein of SARS CoV-2; or a combination thereof;
- mice inoculated with plasmids pGLS-101 (negative control) and pGLS-Spike (positive control) were used.
- T-cell immune response of spleen cells stimulated with Spike OLP was evaluated through ELISpot analysis.
- ORF3_OLP1 which is a pool of 53 OLPs corresponding to ORF3a M1-L275, was used.
- the OLP pool is composed of 15 mer-long peptides with 10 amino acids overlapping each other.
- the results of evaluating the T cell immune response to Spike OLP are shown in FIG. 6 .
- test group pGLS-Spike-ORF3a
- plasmid pGO-1002 effectively induced the T cell immune response to the Spike OLP than the positive control group (pGLS-Spike).
- the T cell immune response of spleen cells stimulated with ORF3a OLP was evaluated through ELISpot analysis, and the results are shown in FIG. 7 .
- test group pGLS-Spike-ORF3a
- the test group inoculated with the plasmid pGO-1002 effectively induced a T cell immune response to the ORF3a OLP.
- the T-cell immune response of spleen cells stimulated with Spike OLP and ORF3a OLP was evaluated by ELISpot analysis.
- the plasmid pGO-1002 was administered to mice through intramuscular injection and electroporation.
- the control group was administered by intramuscular injection and electroporation with plasmid pGLS101.
- the results of evaluating the summated T-cell immune response to Spike OLP and ORF3a OLP are shown in FIG. 8 .
- test group inoculated with the bicistronic vector containing the gene encoding Spike and nucleocapsid prepared in Example 1 had a significant T-cell immune response effect compared to the positive control group.
- the neutralizing antibody titer was evaluated through the PRNT 50 test using a neutralizing antibody that inhibits Live SARS-CoV-2. Specifically, SARS-CoV-2/South Korea/2020 separation and neutralization analysis was performed by the Korea Centers for Disease Control and Prevention. Neutralizing virus titers were measured in heat-inactivated serum samples at 56 °C for 30 min.
- the test group serum was obtained from mice inoculated with the plasmid pGO-1002 prepared in Example 1 (twice at 2 week intervals) through electroporation after intramuscular inoculation, and the control serum was obtained from the plasmid pGLS-101 or It was obtained from mice inoculated with pGLS-Spike.
- SARS-CoV-2 (BetaCoV / Korea / KCDC03 / 2020) (60 pfu ml -1) for 10% FBS, 100 IU ml -1 DMEM medium containing penicillin and 100 ⁇ g ml -1 streptomycin (Invitrogen, Carlsbad, USA) and 50:50: serial dilutions from 1:4 to 1:2040 in a 96-well U bottomed plate.
- test group pGLS-Spike-ORF3a
- the test group inoculated with the plasmid pGO-1002 prepared in Example 1 showed an excellent neutralizing antibody immune response at a similar level to the pGLS-Spike inoculation group. .
- test group inoculated with the bicistronic vector containing the gene encoding Spike and nucleocapsid prepared in Example 1 had a high neutralizing antibody titer.
- Circulating neutralizing antibodies to SARS-CoV-2 that block the interaction between the receptor binding domain of viral spike glycoprotein (RBD) and the ACE2 cell surface receptor (GenScript cat# L00847) were detected.
- the diluted control and test group sera were mixed with the HRP-RBD solution diluted in a 1:1 volume ratio.
- the test group sera was obtained from mice that were intramuscularly inoculated with the plasmid pGO-1002 prepared in Example 1 through electroporation inoculation (twice at 2 week intervals), and the control sera was the plasmid pGLS-101 or pGLS - Obtained from mice inoculated with Spike. The mixture was incubated at 37 °C for 30 min.
- FIG. 11 The results of ACE receptor competition evaluation are shown in FIG. 11. As shown in FIG. 11, the test group (pGLS-Spike-ORF3a) inoculated with the plasmid pGO-1002 prepared in Example 1 had competitive binding ability with hACE2 protein. It was confirmed that this was remarkably high.
- test group inoculated with the bicistronic vector containing the gene encoding Spike and nucleocapsid prepared in Example 1 had high competitive binding ability with hACE2 protein.
- the present inventors have proposed a DNA vaccine against SARS CoV-2, that is, a bicistronic vector comprising Spike and ORF3a genes, which are genes encoding antigenic proteins; and a bicistronic vector including Spike and nucleocapsid genes; was prepared.
- the bicistronic vector generates two antigenic proteins through expression and post-translational modification in vivo, and the produced antigenic protein exhibits remarkable immunogenicity. More specifically, distinct antibodies to each of the two antigens It was confirmed that not only can induce an immune response, but also induce a strong T-cell immune response. Therefore, the bicistronic vector according to the present invention can be used in various ways in the field of preventing SARS-CoV-2 virus infection.
- formulation examples are only for illustrating the present invention, and the scope of the present invention is not to be construed as being limited by the formulation examples.
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Abstract
Description
Items | Cutoff | Result | Interpretation |
SARS CoV-2 neutralizing antibody test | > 20% | Positive | SARS-CoV2 neutralizing antibody detected |
< 20% | Negative | No detectable SARS CoV-2 neutralizing antibody |
Claims (24)
- (a) SARS-CoV-2 Spike 단백질 또는 이를 코딩하는 유전자 및(b) SARS-CoV-2 ORF3a 단백질 또는 이를 코딩하는 유전자; 또는 SARS-CoV-2 nucleocapsid 또는 이를 코딩하는 유전자;를 포함하는, 중증급성호흡기증후군 코로나바이러스 2 감염 예방용 백신 조성물.
- (a) SARS-CoV-2 Spike 단백질 또는 이를 코딩하는 유전자 및(b) SARS-CoV-2 ORF3a 단백질 또는 이를 코딩하는 유전자; 또는 SARS-CoV-2 nucleocapsid 또는 이를 코딩하는 유전자;를 포함하는, 중증급성호흡기증후군 코로나바이러스 2 면역원성 조성물.
- 제1항 또는 제2항에 있어서,상기 Spike, ORF3a 또는 nucleocapsid 단백질을 코딩하는 유전자는 인간의 코돈으로 최적화된 것인, 조성물.
- 제3항에 있어서,상기 Spike 단백질을 코딩하는 유전자는 서열번호 1 또는 3의 염기서열로 표시되는 것인, 조성물.
- 제3항에 있어서,상기 ORF3a 단백질을 코딩하는 유전자는 서열번호 2의 염기서열로 표시되는 것인, 조성물.
- 제3항에 있어서,상기 nucleocapsid 단백질을 코딩하는 유전자는 서열번호 4의 염기서열로 표시되는 것인, 조성물.
- 제1항 또는 제2항에 있어서,상기 (a) Spike 단백질을 코딩하는 유전자; 및(b) ORF3a 또는 nucleocapsid 단백질을 코딩하는 유전자;는 바이시스트로닉 발현 벡터에 포함된 것인, 조성물.
- 제1항 또는 제2항에 있어서,상기 조성물은 2회 투여용인, 조성물.
- 제1항 또는 제2항에 있어서,상기 조성물은 (a) Spike 단백질; 및 (b) ORF3a 또는 nucleocapsid 단백질;에 대한 면역원성이 동시에 유도되는 것인, 조성물.
- 제1항 또는 제2항에 있어서,상기 조성물은 항체 반응 및 T세포 면역반응을 동시에 유도하는 것인, 조성물.
- (a) SARS-CoV-2 Spike 단백질을 코딩하는 유전자 및(b) SARS-CoV-2 ORF3a 단백질을 코딩하는 유전자; 또는 SARS-CoV-2 nucleocapsid 단백질을 코딩하는 유전자;를 포함하는, 바이시스트로닉 발현 카세트.
- 제11항에 있어서,상기 Spike, ORF3a 또는 nucleocapsid 단백질을 코딩하는 유전자는 인간의 코돈으로 최적화된 것인, 바이시스트로닉 발현 카세트.
- 제12항에 있어서,상기 Spike 단백질을 코딩하는 유전자는 서열번호 1 또는 3의 염기서열로 표시되는 것인, 바이시스트로닉 발현 카세트.
- 제12항에 있어서,상기 ORF3a 단백질을 코딩하는 유전자는 서열번호 2의 염기서열로 표시되는 것인, 바이시스트로닉 발현 카세트.
- 제12항에 있어서,상기 nucleocapsid 단백질을 코딩하는 유전자는 서열번호 4의 염기서열로 표시되는 것인, 바이시스트로닉 발현 카세트.
- 제11항에 있어서,상기 바이시스트로닉 발현 카세트는 CMV 프로모터, 코작 서열(Kozak sequence), IgE 리더 서열(IgE leader sequence), 퓨린 인식 부위(furin recognition site), GSG-T2A 절단 부위, BGH 폴리아데닐화 신호(BGH poly adenylation signal), 카나마이신 저항 유전자 및 pUC 오리진으로 이루어진 군에서 선택된 1 이상의 구성요소를 더 포함하는 것인, 바이시스트로닉 발현 카세트.
- 제11항에 따른 바이시스트로닉 발현 카세트를 포함하는, 중증급성호흡기증후군 코로나바이러스 2 감염 예방용 백신 조성물.
- 제11항에 따른 바이시스트로닉 발현 카세트를 포함하는, 중증급성호흡기증후군 코로나바이러스 2 면역원성 조성물.
- 제18항 또는 제19항에 있어서,상기 조성물은 근육내(intramuscular), 정맥내(Intravenous), 피하(subcutaneous), 피내(Intradermal) 및 비강내(intranasal)로 이루어진 군에서 선택된 1 이상의 경로로 투여되는 것인, 조성물.
- 제18항 또는 제19항에 있어서,상기 조성물은 전기천공(electroporation)법, 유전자 총(gene gun)법 및 제트 분사(Jet injection)법으로 이루어진 군에서 선택된 1 이상의 방법으로 투여되는 것인, 조성물.
- 제18항 또는 제19항에 있어서,상기 조성물은 전기천공법을 통해 근육 내 투여되는 것인, 조성물.
- 제18항 또는 제19항에 있어서,상기 조성물은 리포좀 매개 전달(Liposome-mediated delivery)법을 통해 투여되는 것인, 조성물.
- 제11항에 따른 바이시스트로닉 발현 카세트를 개체에 처리하는 단계;를 포함하는 중증급성호흡기증후군 코로나바이러스 2 감염 예방 방법.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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BR112023000915A BR112023000915A2 (pt) | 2020-07-17 | 2021-07-19 | Composição de vacina para prevenir síndrome respiratória aguda grave por infecção do coronavírus 2. |
AU2021309238A AU2021309238A1 (en) | 2020-07-17 | 2021-07-19 | Vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection |
JP2023527955A JP2023545862A (ja) | 2020-07-17 | 2021-07-19 | 重症急性呼吸器症候群コロナウイルス2感染を予防するためのワクチン組成物 |
US18/016,666 US20230272015A1 (en) | 2020-07-17 | 2021-07-19 | Vaccine composition for preventing severe acute respiratory syndrome coronavirus 2 infection |
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AU2021309238A1 (en) | 2023-02-23 |
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JP2023545862A (ja) | 2023-10-31 |
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BR112023000915A2 (pt) | 2023-03-28 |
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