ph selective anti-tumor polypeptide and its application
An anti-tumor and selective technology, applied in the field of anti-tumor drug development and application, can solve problems such as toxic and side effects, and achieve the effect of enhancing selectivity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0068] Embodiment 1. Preparation of polypeptide
[0069] (1) The ribosome display vector (pRDV, Genbank No. AY327136) was used for screening, the empty vector and the library were cut with restriction endonucleases BamHI and HindIII respectively, and the library was inserted into the restriction sites of the vector BamHI and HindIII (Such as figure 1 ). DNA libraries containing 19, 22 and 25 random polypeptide sequences consist of a GNN codon and 18, or 21 or 24 NNS codons, N is adenine (A), guanine (G), A mixture of cytosine (C) and thymine (T), S is a mixture of C and G. NNS can encode all 20 essential amino acids, but only one of the three terminators. The library can encode polypeptides of 19 amino acids, 22 amino acids and 25 amino acids in length. Then, PCR amplifies the above vector inserted into the library, and introduces the T7 RNA polymerase promoter sequence, ribosome binding position (sequence) and 5' stem-loop structure of stable structure before the seque...
Embodiment 2
[0082] Example 2. Anticancer Activity Test of Polypeptides
[0083] The anticancer activity of the polypeptide was detected in human lung cancer cell line A549, human breast cancer cell line MCF-7, human lung fibroblast cell line CCD-13Lu and human breast epithelial cell line MCF-10A. Press 5×10 3 The cells were seeded into a 96-well plate at a density of 1 cell / well and incubated at 37°C for 24 hours. Dilute the polypeptide to different concentrations with culture solution (pH to be tested) to replace the original culture solution. Incubate at 37°C for 2 hours. Then, according to the standard experimental method of MTT, the activity of the polypeptide at different pH values was measured.
[0084] Table 2. Activity of polypeptides at pH 7.5 and 5.5.
[0085]
[0086] *:IC 20 (μM): Peptide concentration that inhibits 20% cell viability.
[0087] pH selectivity = (IC at pH 7.5 50 ) / (IC at pH5.5 50 )
[0088] The results showed that all the peptides studied above ...
Embodiment 3
[0089] Example 3. In vivo experiments
[0090] Feeding and maintenance of Nu / Nu nude mice. Mice were housed in pathogen-free cages on a 12-hour light / 12-hour dark rhythm. Subcutaneously inject 100mL containing 1.7′10 6 A549 cell suspension. Every other day, the tumor size was measured with a vernier caliper, and the volume was calculated according to the following formula: volume=0.5'W'L'H, where W, L and H represent width, length and height, respectively. When the tumor grows to about 100mm 3 start intravenous injection. Mice were divided into four groups: (1) saline (control); (2) ZTU0 in saline (pH 7.5); (3) ZTU17 in saline (pH 7.5); (4) ZTU17 in saline In brine (pH5.5). Each group consisted of 6 to 7 mice. Peptide injection (20nmol polypeptide / mouse, dissolved in 100ml saline) was injected every three days. Tumor volumes were measured every four days after the start of polypeptide injection. 24 days after the start of injections, all mice were sacrificed and ...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com