AFP nanometer antibody A18 based on AFP antigen

A nano-antibody and antigen technology, applied in the biological field, can solve the problems of expensive antibody and antigen standard products, and achieve the effects of small molecular weight, cost saving and unique structure

Active Publication Date: 2015-11-11
NANCHANG DAJIA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And antibody and antigen standards are ver

Method used

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  • AFP nanometer antibody A18 based on AFP antigen
  • AFP nanometer antibody A18 based on AFP antigen
  • AFP nanometer antibody A18 based on AFP antigen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1. Construction of camel-derived immune single domain heavy chain antibody library

[0023] 1) Immunity of alpacas:

[0024] A healthy adult alpaca was selected and immunized by intradermal and subcutaneous multi-point injections on the back. For the first immunization, Freund's complete adjuvant was used, and the dose of immunogen was 1 mg; on the 28th day, the second immunization was performed with Freund's incomplete adjuvant. The dose of immunogen is 0.5 mg, three immunizations on the 49th day, Freund's incomplete adjuvant, the immunogen dose is 0.25 mg; on the 70th day, four immunizations, Freund's incomplete adjuvant, the immunogen dose is 0.25 mg. On the seventh day after the third booster immunization, the peripheral blood of the alpaca was collected for the construction of a phage display library.

[0025] 2) Separation of camel-derived white blood cells: add lymphocyte separation solution to the centrifuge tube, then add blood samples, centrifuge at 7...

Embodiment 2

[0049] Example 2. Affinity panning and identification of AFP Nanobodies

[0050] 1) Affinity panning of AFP Nanobody: In the first round of panning, the anti-AFP antigen was diluted with PBS (pH 7.4), coated with a microtiter plate at a final concentration of 100 μg / mL, and kept at 37° C. for 2 hours. After washing 4 times with PBST (10 mMPBS, 0.5% Tween-20 (v / v)), 300 μL of 3% OVA-PBS was added to block for 1 hour at 37°C. After 1 hour, the blocking solution was discarded, washed 10 times with PBST, and 100 μL camel-derived immune single-domain heavy chain antibody library (titer about 1.0×10 11 cfu), incubated at 37°C for 1 hour. Aspirate unbound phage, wash with PBST 10 times, add 100 μL of Glycine-HCl (0.2M, pH 2.2) to elute for 8-10 min, and immediately neutralize with 15 μL of Tris-HCl (1M, pH 9.1). Take 10 μL of the eluted phage to determine the titer, and the rest is used to infect 20 mL of E.coliTG1 strain grown to the logarithmic phase for amplification. The ampli...

Embodiment 3

[0061] Example 3. The sequencing of the gene encoding the AFP Nanobody and the determination of its amino acid sequence

[0062] The positive phage clones identified by double-antibody sandwich ELISA were subjected to DNA sequencing, and the amino acid sequence could be obtained according to the DNA sequencing results and the codon table.

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PUM

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Abstract

The invention belongs to the technical field of biology, and relates to a camel source immunity nanometer antibody (single-domain heavy-chain antibody, VHH) specifically bound with AFP and application of the antibody. The amino acid sequence of the antibody is SEQ ID NO.:1. The invention further relates to nucleotides for encoding amino acids. The AFP nanometer antibody can be used as the antibody to be applied to immunological detection of AFP not for disease diagnosis and treatment. Compared with a Scfv antibody and a Fab antibody, the camel source immunity VHH has the higher specificity and affinity, more stable in structure, resistant to acid, base and high temperature, high in detection flexibility and the like, so that the immunity detection stability is greatly improved, and meanwhile the environment resistance is greatly improved.

Description

technical field [0001] The invention belongs to the field of biotechnology, and specifically relates to a nanobody (single domain heavy chain antibody, Variable domain of heavy chain of heavy chain antibody, VHH) specifically binding to alpha-fetoprotein (Alpha-Fetal Protein, AFP) and an application thereof. Background technique [0002] Alpha-fetoprotein is a glycoprotein produced by fetal liver or adult liver. It is commonly found in the blood of pregnant women and infants, but its content is very small in the blood of healthy adults. At present, it is mainly used for the early diagnosis and curative effect of primary liver cancer It is an important serological marker for primary liver cancer (PHC) for evaluation and prognosis evaluation. Alpha-fetoprotein as a marker is overexpressed in various tumors, especially hepatocellular carcinoma (HCC). With further in-depth research on the structure and function of AFP gene, it plays an increasingly important role in the early d...

Claims

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Application Information

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IPC IPC(8): C07K16/18C12N15/13G01N33/68
Inventor 付金衡何庆华许杨涂追陈静
Owner NANCHANG DAJIA TECH
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