Gene vector system, its preparation and application
A gene carrier and system technology, applied in the field of biomedical materials, can solve the problems of reducing gene transfection efficiency and being difficult to play a role, and achieve the effects of improving transfection efficiency, improving specific recognition and transmission, and increasing serum stability.
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Embodiment 1
[0030] Example 1: Preparation of reduction sensitive masking system with targeting function
[0031] According to the feeding ratio described in Table 1, dissolve hyaluronic acid in phosphate buffer saline (PBS) with pH 6.8, add 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride salt (EDC·HCl) and 1-hydroxybenzotriazole (HOBT), stirred, and reacted at room temperature for 2 hours to activate the carboxyl group. Add cystamine dihydrochloride (Cys), stir, and react the above reaction solution overnight at room temperature. After the reaction, the reaction product is dialyzed for 48 hours with a dialysis bag with a cut-off of 3500, and then freeze-dried to obtain cystamine-grafted transparent Hyaluronic acid (HA-Cys). The grafting ratio of cystamine in the product (HA-Cys) was calculated by nuclear magnetic spectrum, and the results are shown in Table 1.
[0032] Hyaluronic acid (HA-Cys) grafted with cystamine in different proportions was dissolved in phosphate buffere...
Embodiment 2
[0036] Example 2: Preparation of Gene Carrier System with Reduction Sensitive Masking System with Targeting Function
[0037] Dissolve plasmid DNA in sterilized water to prepare DNA solution A with a concentration of 0.1 mg / mL; dissolve cationic polymer gene carrier polyethyleneimine (PEI) in sterile HBG buffer (4-hydroxyethylpiperazine ethanesulfonic acid 20 mmol, pH 7.4, 5% glucose), to prepare PEI solution B with a concentration of 0.01-1 mg / mL; dissolve the reduction-sensitive masking system (HA-SS-COOH) with targeting function In sterile HBG buffer, prepare HA-SS-COOH solution C with a concentration of 0.01-1 mg / mL.
[0038] The cationic polymer PEI solution of different concentrations and the plasmid DNA aqueous solution were mixed at a mass ratio of 1.2:1, and the mixed aqueous solution was incubated at room temperature for 20 minutes to obtain a PEI / DNA complex. Add different concentrations of HA-SS-COOH solutions, and incubate the aqueous solution at room temperature...
Embodiment 3
[0041] Example 3: Using gel electrophoresis to identify the stability of complex particles
[0042] Mix 5 μL of 0.1 mg / mL DNA solution with 3 μL of 0.2 mg / mL PEI solution, incubate at room temperature for 20 minutes, then add 5 μL of HA-SS-COOH solution of different concentrations to make HA-SS-COOH / DNA The mass ratios were 10, 6, 3, 2, 1 and 0.5, and after incubation at room temperature for 10 minutes, the gel electrophoresis retardation experiment was used to detect the complex particles after adding different amounts of HA-SS-COOH shielding system. stability.
[0043] figure 2 The results of electrophoresis show that the complex formed between the cationic polymer and DNA will not be destroyed when the amount of the HA-SS-COOH hyaluronic acid masking system added reaches 10 times the amount of DNA.
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