DNA origami-based construction method and application of precise recognition targeted nano-carrier

A nanocarrier and construction method technology, applied in the field of medicine, can solve the problems of inability to achieve accurate identification and weak anti-tumor effect, and achieve the effect of enhancing anti-tumor effect, enhancing biotherapeutic effect, and delaying release.

CN107469088AActive Publication Date: 2017-12-15ZHENGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-12-15

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Abstract

The invention relates to a DNA origami-based construction method and an application of a precise recognition targeted nano-carrier, and belongs to the technical field of medicines. The carrier is composed of scaffold DNA, staple single-stranded DNA, special staple single-stranded DNA and a nucleic acid aptamer, wherein a molar ratio of the scaffold DNA to the staple single-stranded DNA to the special staple single-stranded DNA is 1:(5-10):(5-10); a molar ratio of the nucleic acid aptamer to origami is 1:(1-32); a molar ratio of the carrier to an antitumor medicine doxorubicin during drug loading is 1:(12500-50000); and the appropriate drug loading time is 2-6 h. The targeted nano-carrier has the advantages of realization of a target heat accurately-modified NDA carrier, improvement of the targeting effect of the carrier and the target heat induced biological effects, delaying of the drug release after drug loading, reduction of the toxic and side effects of anthracene ring antitumor drugs, and enhancement of the antitumor effect on tumor cells, and makes a drug-loaded system simultaneously perform chemotherapy effects and biotherapy effects.
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Description

technical field

[0001] The invention belongs to the field of medical science and technology, and relates to the construction of anthracycline antineoplastic drug nanocarriers by DNA origami, in particular to a DNA origami-based construction method for precisely identifying and targeting nanocarriers and its application. Background technique

[0002] DNA origami was first proposed by Nadrian Seeman in the 1980s. A milestone research achievement in this field is the research achievement published in Nature by Paul W.K.Rothemund in 2006. In the study, the synthesis steps of DNA origami were greatly simplified, so that the staples used in DNA origami no longer need to have a strict proportional relationship between the single-stranded DNA and the scaffold DNA, just excess, and the self-assembly process is also controlled by The previous tens of hours were shortened to hours or even tens of minutes.

[0003] Nucleic acid aptamer is an oligonucleotide fragment with high affinity ...

Examples

Embodiment Construction

[0036] A DNA origami-based construction method for precisely identifying and targeting nanocarriers, the steps of which are as follows:

[0037] (1) Prepare scaffold DNA (M13mp18 single-stranded DNA (N4040S), staple single-stranded DNA and special staple single-stranded DNA as materials for constructing carriers (staple single-stranded purchased from Sangon Bioengineering (Shanghai) Co., Ltd. Co., Ltd., scaffold DNA was purchased from NEB Company in the United States); design and synthesize specific nucleic acid aptamer DNA (C2NP), and make a linker between the special staple single-stranded DNA and the nucleic acid aptamer DNA, and the linker is the staple The structure formed by the specific oligonucleotide sequence on the staple single-stranded DNA and the nucleic acid aptamer DNA through the principle of complementary base pairing;

[0038] (2) Dissolve the staple ssDNA, special staple ssDNA and scaffold DNA obtained in step (1) in 1×TAE / Mg 2+ A reaction solution is obtai...