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Porcine circovirus type 2 subunit vaccine, and preparation method and application thereof

A subunit vaccine, porcine circovirus technology, applied in botanical equipment and methods, biochemical equipment and methods, applications, etc., can solve problems such as unoptimized production process conditions, loss of protein immunogenicity, and difficulty in cultivation , to achieve the effect of improving viral protein yield and quality, enhancing specific antibody response, and improving expression efficiency

Active Publication Date: 2013-02-13
WUHAN CHOPPER BIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestically produced vaccines are whole-virus inactivated vaccines. For example, document CN101240264A discloses a whole-virus inactivated vaccine, but PCV2 has weak proliferative ability in vitro cells, and it is difficult to cultivate, and the final titer of the virus is low. The antigen content is limited, and the preparation of high-quality PCV2 vaccines requires concentrated viral antigens, which will directly lead to high vaccine production costs and cannot meet the actual requirements of animal vaccines with high quality and low price
Documents CN101180406A, CN101884787A and CN101358182A all disclose the expression of Cap protein encoded by PCV2 ORF2 gene with recombinant baculovirus, and use it to prepare PCV2 vaccine. Optimizing its production process conditions leads to low yield and quality of viral protein, and the expressed target gene is modified with other redundant sequences (such as 6×His tag, secretory signal peptide, etc.), which is not conducive to the expression Foreign proteins form virus-like particles (virus-like particles, VLPs), and these recombinant baculovirus construction technology strategies have the defect of partial loss of immunogenicity of the expressed target protein
In addition, due to factors such as adjuvants and immune stimulants of the subunit vaccine, the immune effect in practice is not good

Method used

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  • Porcine circovirus type 2 subunit vaccine, and preparation method and application thereof
  • Porcine circovirus type 2 subunit vaccine, and preparation method and application thereof
  • Porcine circovirus type 2 subunit vaccine, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1 Construction of recombinant baculovirus

[0064] Use the Bac-to-Bac system to construct recombinant baculovirus, and design the following primers according to the gene sequence published by GENBANK (NCBI accession number EU340257.1):

[0065] P1: TCTGGATCCATGACGTATCCAAGGAGGCG

[0066] P2: GCGAAGCTTTAAGGGTTAAGTGGGGGTC

[0067] P3: TCTCTCGAGATGACGTATCCAAGGAGGCG

[0068] P4: GCGGGTACCTAAGGGTTAAGTGGGGGGTC

[0069] Using the PCV2b strain virus ORF2 sequence as a template (the template was synthesized according to the published PCV2b ORF2 sequence: accession number EU340257.1), P1 and P2 amplified the PCV2 ORF2 gene, and cloned the gene into the pMD-19T vector to obtain The recombinant vector pMD-19T-ORF2-1 uses the PCV2b strain virus ORF2 sequence as a template, amplifies the PCV2 ORF2 gene at P3 and P4, and clones the gene into the pMD-19T vector to obtain the recombinant vector pMD-19T-ORF2-2.

[0070] Digest pMD-19T-ORF2-1 with BamH I and Hind III, clone t...

Embodiment 2

[0071] Example 2 Serum-free Suspension Culture of Insect Cells in a Bioreactor and Quantification of Cap Protein Expression

[0072] Aseptically culture Sf9 insect cells in a 1000ml shake flask for 3-4 days until the concentration reaches 3-5×10 6 cells / ml, when the viability is greater than 95%, inoculate the cells into a 5L bioreactor with an inoculation concentration of 3-8×10 5 cells / ml. When the cell concentration reaches 3-5×10 6 cells / ml, inoculate the cells into a 50L bioreactor, and wait for the cells to grow to a concentration of 3-5×10 6 cells / ml, inoculate into a 500L bioreactor until the cell concentration reaches 2-8×10 6 When cells / ml, inoculate recombinant virus rBac-2ORF2 or rBac-ORF2, the multiplicity of infection (MOI) is 0.001-10, the reactor culture conditions are pH6.0-6.5, temperature 25-27℃, dissolved oxygen 30-80%, Stirring speed 100-180rpm. Considering the optimal conditions for cell culture, the preferred pH is 6.2, the temperature of the cell...

Embodiment 3

[0078] Example 3 Purification of VLP Particles and Observation with Electron Microscope

[0079] Harvest the expression cell culture, centrifuge the cell culture at 10,000 g at 4°C for 30 min, remove cell debris, take the supernatant, and centrifuge the supernatant at 31,000 rpm for 3 h (Beckman SW70 rotor), resuspend the pellet with a small amount of PBS, and wait until the pellet is completely dissolved , add CsCl according to 2.1g / 4.5ml solution, mix evenly, dispense into 5ml ultracentrifuge tubes, add PBS to a distance of 2-3mm from the tube mouth, after accurate balance, centrifuge at 149000g at 10°C for 24h. After centrifugation, two light yellow transparent bands can be seen. Aspirate and collect the target band (lower band), which is the purified virus-like particles.

[0080] Under the same conditions, culture an equal amount of cell cultures expressing rBac-ORF2 and rBac-2ORF2, and treat them according to the above method, dilute the aspirated target band to the s...

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Abstract

The invention relates to a porcine circovirus type 2 subunit vaccine, and a preparation method and an application thereof. The recombinant baculovirus contains double promoters (a polyhedrin protein promoter and a P10 promoter), and can express double copies of Cap protein coding genes, such that protein expression efficiency is substantially improved. Also, Cap protein expressed by an inserted exogenous gene does not contain excess sequences, such that virus-like particles (VLPs) can be effectively formed, expressed protein immunogenicity is improved, and the content of produced antigen is high. According to the porcine circovirus type 2 subunit vaccine provided by the invention, protein yield and quality of porcine circovirus type 2 subunit vaccine are substantially improved, and prepared vaccine compositions have the advantages of stable and long-lasting immune effect, high safety, and the like.

Description

technical field [0001] The invention relates to the technical field of veterinary biological products, in particular to a porcine circovirus type 2 subunit vaccine and a preparation method and application thereof. Background technique [0002] Porcine circovirus type 2 (PCV2) is the main causative agent of multisystemic wasting syndrome (PMWS) in weaned piglets, which is characterized by immunosuppression and multisystem failure in weaned piglets. , anemia, dyspnea, diarrhea, weakness, slow weight gain, swollen lymph nodes and other clinical symptoms. Since the outbreak of PMWS in Canadian pig herds in 1991, PMWS has caused great economic losses to the swine industry worldwide. PCV2 can not only cause the failure of multiple systems in weaned piglets, but also damage the immune function of infected pigs, resulting in a decrease in the body's resistance, causing secondary infections and aggravating the disease. In addition, PCV2 has been associated with conditions such as r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N15/866C12N15/34C12N7/01C07K14/01A61K39/12A61P31/20C12R1/93
Inventor 朱薇熊媛媛漆世华张萍秦红刚李伟廖园园谢红玲温文生王桢桢靖志强吴玉石韩兴刘洁
Owner WUHAN CHOPPER BIOLOGY
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