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Divalent DNA vaccine for preventing giardiasis and enteric-coated preparation thereof

A DNA vaccine, giardiasis technology, applied in the field of vaccines, can solve problems such as the difficulty in ensuring the amount of animal feed, achieve the effect of easy large-scale production, overcome the single effect of vaccines, and have good application prospects

Inactive Publication Date: 2015-05-06
JINLIN MEDICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common problem of various veterinary vaccines through bait or feed feeding route is that it is difficult to guarantee the amount of animal feeding

Method used

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  • Divalent DNA vaccine for preventing giardiasis and enteric-coated preparation thereof
  • Divalent DNA vaccine for preventing giardiasis and enteric-coated preparation thereof
  • Divalent DNA vaccine for preventing giardiasis and enteric-coated preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Construction and Identification of Recombinant Prokaryotic Expression Vectors pET41a-α1-giardin and pET41a-CWP-2

[0055] (1) According to the gene sequencing of α1-giardin in the Genbank database, specific primers were designed and synthesized, and HindⅢ and EcoRI restriction sites were introduced at both ends of the sequence, and the protective base GC was introduced at both ends of the restriction site.

[0056] Primers for α1-giardin:

[0057] α1-G-F1:CC AAGCTT ATGCCGAAGGTCACCGACAT(HindIII)

[0058] α1-G-R2:CG GGATCC CTTCACGCGCCAGAGGGTGC(BamHI)

[0059] (2) According to the gene sequence of Giardia CWP2 in the Genbank database, the antigenic epitope encoded by it was analyzed, and an epitope containing 125 amino acids was screened out. Design specific primers, introduce HindⅢ and EcoRI restriction sites at both ends of the sequence, and introduce protective base GC at both ends of the restriction sites.

[0060] Primers for CWP-2:

[0061] Gl-CWP2-F5:CC AAGCTT A...

Embodiment 2

[0067] Massive expression and purification of recombinant α1-giardin and CWP-2 in Escherichia coli, preparation of specific antibodies

[0068] (1) Extended expression system: Pick a single colony from the plates of pET41a-α1-giardin / BL21 and pET41a-CWP-2 / BL21 and put it into 50 ml of LB culture medium containing kanamycin. 37°C, 200rpm, shaking culture overnight; the next day, take 25ml of the overnight cultured bacterial solution and inoculate two 4L Erlenmeyer flasks containing 1L LB (containing 30μg / ml kanamycin). 37°C, 250rpm, rapid shaking culture to OD600≈0.6. Add IPTG to a final concentration of 1 mM, induce expression at 30°C, 250 rpm for 5 hours; collect the bacterial pellet by centrifugation, ultrasonically lyse, collect the supernatant (soluble expression), and use His-tag affinity chromatography column to purify the target protein.

[0069] (2) Preparation of specific polyclonal antibodies: Take 20 BALB / c female mice aged 6-8 weeks, respectively use 20 μg / 0.1ml o...

Embodiment 3

[0071] Construction of recombinant plasmids pVAX1-α1-giardin and pVAX1-CWP-2

[0072] (1) According to the gene sequencing of α1-giardin in the Genbank database, specific primers were designed and synthesized, and HindⅢ and EcoRI restriction sites were introduced at both ends of the sequence, and the protective base GC was introduced at both ends of the restriction site.

[0073] Primers for α1-giardin:

[0074] α1-G-F1:CC AAGCTT ATGCCGAAGGTCACCGACAT(HindIII)

[0075] α1-G-R2:CG GGATCC CTTCACGCGCCAGAGGGTGC(BamHI)

[0076] (2) According to the gene sequence of Giardia CWP2 in the Genbank database, the antigenic epitope encoded by it was analyzed, and an epitope containing 125 amino acids was screened out. Design specific primers, introduce HindⅢ and EcoRI restriction sites at both ends of the sequence, and introduce protective base GC at both ends of the restriction sites.

[0077] Primers for CWP-2:

[0078] Gl-CWP2-F5:CC AAGCTT AGGCAGACAGTAGTCCGC(HindIII)

[0079] Gl-CWP...

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Abstract

The invention discloses a divalent DNA vaccine for preventing human or animal giardiasis. The preparation method comprises the following steps: respectively inserting two antigen genes alpha1-giardin and CWP-2 of giardia into a eukaryotic vector pVAX1, thereby obtaining recombinant plasmids pVAX1-alpha1-giardin and pVAX1-CWP-2; and respectively transferring the recombinant plasmids pVAX1-alpha1-giardin and pVAX1-CWP-2 into host bacteria, thereby obtaining recombinant bacteria comprising the recombinant plasmids pVAX1-alpha1-giardin and pVAX1-CWP-2 respectively, wherein the recombinant bacteria form the divalent DNA vaccine disclosed by the invention. The anti-giardiasis divalent DNA vaccine in combined application aiming at two stages of trophozoite and cyst respectively is creatively provided, the formation of the trophozoite is inhibited to block the diseases and inhibit formation of the cyst so as to cut off propagation, and the defect that the vaccine is single in effect in the previous vaccine research and development is overcome. According to the divalent DNA vaccine, passage stability and continuous protectiveness are realized. The invention also discloses a quantitative enteric-coated preparation comprising the divalent DNA vaccine and a preparation method of the enteric-coated preparation.

Description

technical field [0001] The invention relates to the field of vaccines, in particular to a bivalent DNA vaccine for preventing human and animal giardiasis and an enteric-coated preparation thereof. Background technique [0002] Giardia lamblia (Giardia lamblia for short) is a human pathogenic protozoa that can cause diarrhea, malabsorption syndrome and growth disorders in children. There are about 500,000 new infections every year in the world, and the infection rate among AIDS patients is extremely high (about 20%-50%). It has been listed by the World Health Organization as one of the ten major parasitic diseases that endanger human health in the world. . In addition, Giardia can infect more than 40 kinds of animals, which is a typical zoonotic disease and one of the important parasites that endanger the development of animal husbandry in my country. [0003] The life cycle of Giardia includes two developmental stages, trophozoite and cyst, and two processes of exocyst and...

Claims

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Application Information

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IPC IPC(8): A61K39/002A61K48/00A61K9/36C12N15/70C12N15/63A61P33/02
CPCY02A50/30
Inventor 冯宪敏郑文彧李瑶崔柏吉张宏梅
Owner JINLIN MEDICAL COLLEGE
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