VEGF receptor fusion protein and its use in preparation of medicament for treating eye disease
A fusion protein and receptor technology, applied in sensory diseases, drug combination, drug delivery, etc., can solve the problems of retinal scarring, affecting vision, detachment, etc.
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Embodiment 1
[0018] Example 1, FP 7 build
[0019] The fusion protein FP7 is extracted from HUVEC cells by primers flt-1D2(F), flt-1D2(R), KDR D3(F) and KDRD3-4(R) (see patent application, application number CN200510073595.4) The flt-1 and KDR gene fragments amplified on cDNA synthesized from mRNA as a template were recombined. The specific conditions are denaturation at 95° for 30 minutes, annealing at 56° for 45 seconds, extension at 72° for 2 minutes, and PCR amplification for 30 cycles to obtain flt-1 and KDR IgG-like domains. PCR product. Using TA cloning kit, clone the PCR product into PCR2.1 plasmid, and transfect E.coli, select white colonies, add LB medium, and culture overnight. Plasmids were extracted with Qiangen plasmid extraction kit, digested and identified by sequencing. Using splicing PCR (Sewing PCR) method, the flt-1 fragment, the KDR fragment and the ribonucleic acid of the partial sequence of the IgG hinge region were connected together. Design EcoR1 restriction s...
Embodiment 2
[0020] Example 2, FP 8 build
[0021]The fusion protein FP8 was directly amplified by PCR using FP7 as a template, and the primers used in PCR were flt-1D2 (F) and KDR D3-hing (R). The sequence of the latter is: 5'-aggtgctgggcacagtgggcatgtgtgagttttgtctttttcatggaccctgacaaatg. It includes a sequence complementary to the third immunoglobulin-like region of KDR and a partial nucleotide sequence of the human IgG Fc hinge region. The method of PCR amplification and gene cloning is identical with example 1. Finally, the PcDNA3.1 plasmid inserted with FP8 was transfected into CHO cells, and a stable cell line was obtained for protein expression. The amino acid sequence of FP8 is shown in Sequence List 2, and the nucleotide sequence is shown in Sequence List 4.
Embodiment 3
[0022] Example 3 Experiment of binding affinity between fusion protein and VEGF
[0023] The present invention determines the ability of various fusion proteins to bind VEGF by measuring the amount of VEGF. In this test, a certain amount of VEGF (10PM) was added to the test tube, and then diluted various fusion proteins containing different amounts were added to the test tube containing VEGF, and after mixing, they were placed in a 37 ° incubator. Save for an hour. One hour later, the free VEGF in the test tube was measured by a kit for detecting the amount of VEGF provided by R&D systems——VEGF assay Kit. The measured results are processed by software to obtain the results shown in Figure 2, which shows that FP 1 , FP 3 and FP 7 can effectively bind to VEGF affinity, and its binding affinity can be determined by IC 50 Said, respectively, are 11.2PM, 4.3PM and 4.1PM. This experiment proves that FP 3 and FP 7 Binding ability to VEGF is similar in vitro, and both are high...
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