Nanometer genetic medicine resistant to tumors and preparation method and application thereof
A genetic drug and anti-tumor technology, applied in anti-tumor drugs, drug combinations, pharmaceutical formulations, etc., can solve the problems of nano-drugs without targeting and pH responsiveness, and achieve improved targeting and better treatment Good effect, biocompatibility
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Embodiment 1
[0082] In this embodiment, the anti-tumor nanogene drug is prepared by the following method, which is:
[0083] Select (Robert Qing Miao et al., PNAS, 2006,103(29):10997-11002) to provide the Mouse NgBR siRNA double-stranded nucleic acid base sequence (sequence starting from the 5' end is: ACAUUAGCGUCACGACCAdTdT, the corresponding sequence of the other chain is: UGGUCGUAGACGCUAAUGUdTdT) as a therapeutic small interfering RNA nucleic acid molecule, prepared nanomicelle according to the mature microemulsion method reported in the literature, and electrostatically adsorbed therapeutic NgBR siRNA through positively charged PEI, Then, a plurality of DMMAs are connected through amino groups (including terminal amino groups and side chain amino groups) on the PEI to obtain amphiphilic anti-tumor cationic polymer micelles coupled with acid-responsive functional molecules. The synthesis process is as follows:
[0084] (1) PEI-(PLGA) for the synthesis of PEI-PLGA-DMMA cationic polymer ...
Embodiment 2
[0093] In the present embodiment, through the same synthesis method and steps as in Example 1, the cationic polymer nanomicelle PEI-(PLGA) 2 The acid-responsive DMMA molecule was coupled to the acid-responsive cationic polymer nanometer gene carrier coupled with DMMA. The anti-tumor nanogene drug system was obtained through the same adsorption process of therapeutic NgBR siRNA as in Example 1.
[0094] It was confirmed by means of Fourier transform infrared spectroscopy that the structure of the nanomicelle coupled with DMMA cationic polymer obtained in this example is: PEI-PLGA-DMMA.
[0095] The shape and particle size of the obtained anti-tumor nano-gene drug system were characterized by transmission electron microscope and laser particle size analyzer. The distribution is 60-150nm, the average particle size is about 130nm, and the dispersion index (PDI) is 0.083.
Embodiment 3
[0097] In this embodiment, the protective effect of self-assembled nanoparticle of anti-tumor nanogene drug on its surface adsorbed siRNA in neutral Tris-HCl buffer solution containing 10% serum was determined.
[0098] Incubate the anti-tumor nanogene drug system samples obtained in Example 1 with neutral Tris-HCl buffer solution containing 10% serum for 0h, 1h, 3h, 6h, 12h, 24h, 48h, and take 10 μL samples at each time point Add it to the pre-prepared agarose gel loading well, mix 10 μL of the system with the corresponding proportion of syber green dye and loading buffer, and then run the gel electrophoresis under the condition of voltage 100V. After about 10 minutes, place the gel in In the bio-rad biological imager, select the ultraviolet mode for imaging. Such as image 3 As shown, after incubation with the neutral Tris-HCl buffer containing 10% serum for different times, the content of siRNA remained consistent compared with the control group, which indicated that in th...
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