CD8+T cell dominant epitopes based on toxoplasmagondii bradyzoite antigens
A dominant epitope and Toxoplasma gondii technology, applied in the direction of anti-receptor/cell surface antigen/cell surface determinant immunoglobulin, protozoan antigen components, anti-animal/human immunoglobulin, etc., can solve the undiscovered prevention and control Drugs and other issues
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Embodiment 1
[0012] Example 1 Screening of dominant epitopes, immunization of BALB / c mice
[0013] The SAG2C, SAG2D and SAG2X protein sequences were retrieved from the Toxoplasma gondii database (ToxoDB: http: / / toxodb.org / ). Antigenic epitopes were screened using the (ANN, SMM) algorithm in the Immunological Epitope Database (IEDB) (http: / / www.iedb.org / ). Screened out 6 H-2 (Ld, Kd, Dd) high-affinity CD8 + The specific sequence of the T cell epitope peptide (Table 1) is shown in 1-6 in the sequence listing, and it is artificially synthesized. Dissolve the peptides in PBS and mix them to immunize BALB / c mice. Inject 100ul of the peptide mixture at the base of the tail of the mice, in which the content of each peptide is 100ug. Immunization 2 times, 3 weeks apart.
Embodiment 2
[0014] Example 2 Cell Proliferation Experiment of Immunized Mice
[0015] Four weeks after immunization, the spleen of the immunized mice was taken under aseptic conditions, the spleen cell suspension was prepared, and the epitope peptide was added to stimulate, at 37°C, 5% CO 2 After culturing under the condition for 48 hours, 10 μl of WST-8 dye was added to every 100 μl of cell culture medium, and the lymphocyte proliferation experiment was carried out by the CCK-8 method, and the absorbance value of each well was measured at 450 nm. (results see figure 1 ).
[0016] The results showed that the two epitope peptides: VPNSSLVEN and SQFLSLSLL showed high absorbance values, which proved that they had a strong ability to stimulate the proliferation of splenocytes, and could be used as superior candidate epitopes for the design of epitope vaccines.
Embodiment 3
[0017] Example 3 Determination of the production of cytokines induced by the dominant epitope vaccine in mice
[0018] After dissolving the polypeptide VPNSSLVEN and SQFLSLSLL in PBS to 10ug / ul, inject the immunized BALB / c mice into the tail of the mice, divide them into control group, single peptide immunization group and mixed immunization group, and the single peptide immunization group was injected with single peptide VPNSSLVEN100ug respectively Or SQFLSLSLL100ug, the mixed immunization group was injected with two kinds of single peptides at the same time, and the content of each peptide was 100ug. Immunization 2 times, 3 weeks apart. The preparation of the splenocyte suspension of immunized mice was as described in Example 2. After the splenocytes from mice were stimulated, the culture supernatants were collected at different times to measure the contents of IL-2 and IL-10 in cells. The results are shown in Table 2. A large amount of IL-2 was detected in the splenocyte ...
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