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mip3α-fc fusion protein and use thereof

A fusion protein and inflammatory protein technology, applied in the field of genetic engineering, can solve the problems of limited clinical application value, short half-life of MIP-3α protein, etc., and achieve the effects of growth inhibition, long-acting plasma half-life, good biological activity and stability

Active Publication Date: 2018-05-22
HAINAN MEDICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the half-life of ordinary recombinant MIP-3α protein is very short in vivo, requiring frequent administration of large doses, which greatly limits its clinical application value

Method used

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  • mip3α-fc fusion protein and use thereof
  • mip3α-fc fusion protein and use thereof
  • mip3α-fc fusion protein and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Construction of MIP3α-Fc fusion protein recombinant expression plasmid

[0027] 1. Construction of human MIP3α-Fc fusion protein recombinant expression plasmid

[0028] The human MIP3α gene (GeneBank: NM_001130046.1) was amplified using the cDNA clone (purchased from Origene) as a template, and the primer sequences used were as follows (including Kozak sequence, cloning site, and protected bases)

[0029] Upstream primer: 5'-ATATCCTTAAGCGGCCGCCGCCACCATGTGCTGTACCAAG-3'

[0030] Downstream primer: 5'-ATATGGGATCCATGTTCTTGACTTTTTACTG-3'

[0031] Use 50ul of PCR reaction system, add 1ul of 20mM primers; add 1ul of 10mM dNTP; add 1ul of pfu DNA polymerase, 2.5U / ul. The reaction conditions were 30 cycles of 95° C. for 30 seconds, 55° C. for 30 seconds, and 72° C. for 45 seconds. The PCR product was analyzed by 1.8% agarose gel electrophoresis, which was in line with the expectation (320bp).

[0032] The obtained PCR product was recovered by gel and digested with ...

Embodiment 2

[0039] Example 2 Expression and purification of MIP3α-Fc fusion protein

[0040] 1. Transient expression of MIP3α-Fc fusion protein in HEK293 cells

[0041] HEK293 cells in the logarithmic growth phase were digested with trypsin and diluted to 6×10 5 / mL density, inoculate into 15cm petri dish, add 20ml serum-free medium to each petri dish, and culture for about 24 hours for transfection. The recombinant plasmid was transfected into HEK293 cells using Lipofectamine 2000 transfection reagent (Invitrogen Company), and the plasmid used was extracted by endotoxin-free plasmid extraction kit (Sigma Company). Transfected cells were cultured in a 5% carbon dioxide incubator for 5 days and the supernatant was obtained. The fusion protein yield in the supernatant was determined by enzyme-linked immunosorbent assay (ELISA).

[0042] 2. Stable high expression of MIP3α-Fc fusion protein in CHO cells

[0043] Dilute CHO cells in logarithmic growth phase to 4 x 10 6 After / ml, add 0.5ml ...

Embodiment 3

[0046] Example 3 Determination of plasma half-life of MIP3α-Fc fusion protein

[0047] Four 10-week-old C57BL / 6 mice were injected with mouse MIP3α-Fc fusion protein into the tail vein, 0.1 mg per mouse, and blood was collected alternately at the following time points: 30 minutes, 2 hours, 4 hours, 12 hours, 24 hours, 48 ​​hours, 72 hours, 96 hours. Blood samples were used to detect the concentration of mouse MIP3α-Fc fusion protein by specific ELISA. The results showed that the half-life of the MIP3α-Fc fusion protein was as long as 30 hours. The result is as Figure 6 shown.

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Abstract

The present invention provides a MIP3α-Fc fusion protein, the fusion protein is a dimeric fusion protein of macrophage inflammatory protein MIP3α and Fc, and the hinge region of immunoglobulin or Flexible peptide linkage. The present invention provides a long-acting MIP3α-Fc fusion protein. This new type of fusion protein exhibits good biological activity and stability both in vivo and in vitro, and can chemoattract immature dendritic cells. Intratumoral injection of MIP3α‑Fc fusion protein can effectively inhibit tumor growth and has long-term Plasma half-life.

Description

technical field [0001] The invention relates to a MIP3α-Fc fusion protein, its coding nucleotide sequence, and the pharmaceutical use of the fusion protein, belonging to the technical field of genetic engineering. Background technique [0002] Dendritic cells (DC cells) are professional antigen-presenting cells with the most powerful functions in the body. They can efficiently ingest, process and present antigens, induce specific cytotoxic T lymphocytes, and play a role in the initiation, regulation, and It is central to the process of maintaining the immune response. In recent years, a large number of studies have shown that dendritic cells loaded with tumor-associated antigens, reinfused or immunized into tumor-bearing hosts can induce specific cytotoxic T lymphocytes (CTL) anti-tumor immune response. At the same time, dendritic cells are closely related to the occurrence and development of tumors. Most solid tumors have more dendritic cells infiltrating, and the prognosi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K19/00C07K14/47C12N15/62C12N15/85C12N5/10A61K38/17A61P35/00
Inventor 郑少江郭峻莉翁志宏郑少萍张晓钿
Owner HAINAN MEDICAL COLLEGE
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