WO2024232421A1 - 可溶性flt-1に選択的に結合するdnaアプタマーおよびそのdnaアプタマーが固定化された担体 - Google Patents
可溶性flt-1に選択的に結合するdnaアプタマーおよびそのdnaアプタマーが固定化された担体 Download PDFInfo
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- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
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- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
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- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
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- A61P3/00—Drugs for disorders of the metabolism
- A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
- A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/115—Aptamers, i.e. nucleic acids binding a target molecule specifically and with high affinity without hybridising therewith ; Nucleic acids binding to non-nucleic acids, e.g. aptamers
Definitions
- the present invention relates to a DNA aptamer that binds to soluble FLT-1 (sFLT-1) and its uses.
- DNA aptamers are ligand recognition molecules that are expected to have a wide range of applications as nucleic acid drugs.
- complementary sequences within a DNA oligonucleotide molecule form complementary strands, causing the single-stranded DNA oligonucleotide to form secondary and tertiary structures, and this three-dimensional structure allows it to bind specifically and strongly to target molecules.
- Preeclampsia is a disease that occurs in approximately one in 20 pregnant women and causes severe complications for the mother and fetus.
- One of the causes of preeclampsia is an increase in the amount of soluble FLT-1 (soluble fms-like tyrosine kinase-1: hereafter referred to as "sFLT-1") in the blood.
- sFLT-1 also known as "sVEGFR1
- sVEGFR1 is a soluble form of VEGFR1 that binds to VEGF (vascular endothelial growth factor) and PLGF (placenta growth factor) in the blood, thereby inhibiting signals from their receptors, VEGFR1.
- VEGF vascular endothelial growth factor
- PLGF placenta growth factor
- Non-Patent Document 1 Patent Document 1
- Patent Document 2 Another example of non-specific removal of sFLT-1 is the removal of sFLT-1 by simple plasma exchange (Non-Patent Document 2).
- sFLT-1 and dextran sulfate bind based on simple electrostatic interactions, and therefore the binding lacks specificity. For this reason, even useful components in the blood may be mistakenly removed due to electrostatic interactions.
- components other than sFLT-1 may be adsorbed to dextran sulfate, saturating the binding surface on the dextran sulfate, reducing the efficiency of sFLT-1 removal, and so nonspecific removal of sFLT-1 is an issue when attempting removal using a dextran sulfate apheresis column.
- the sFLT-1 removal method using simple plasma exchange requires supplementation of blood products associated with plasma exchange, and such supplementation may pose a risk of infection.
- the present invention was made in consideration of these circumstances, and aims to provide a DNA aptamer and a carrier with an immobilized DNA aptamer as an sFLT-1 removal device that can more efficiently and specifically remove sFLT-1 from blood, is inexpensive, has uniform quality, and can be used more safely.
- the DNA aptamer that selectively binds to sFLT-1 according to the present invention and the carrier on which the DNA aptamer is immobilized employ the following means.
- the first aspect of the present invention provides a DNA aptamer that selectively binds to sFLT-1, which has a base sequence containing two artificial bases 7-(2-thienyl)-3H-imidazo[4,5-b]-pyridin-3-yl (Ds), contains 13 to 18 bases between the two Ds, and at least one of the two Ds is located within a sequence that forms a single strand when a tertiary structure is formed.
- Ds 7-(2-thienyl)-3H-imidazo[4,5-b]-pyridin-3-yl
- the DNA aptamer may have a base sequence set forth in any one of SEQ ID NOs: 1 to 9.
- the DNA aptamer may have the base sequence set forth in SEQ ID NO: 1, 3 or 4.
- the DNA aptamer may be (a) a base sequence as set forth in any one of SEQ ID NOs: 2 and 5 to 9, or (b) any sequence as set forth in any one of SEQ ID NOs: 2 and 5 to 9, in which a base sequence having 3 to 7 bases linked to the 5' side of the Ds located on the 5' side of the two Ds and a base sequence having 3 to 7 bases counting from the 10th base from the Ds linked to the 3' side of the Ds located on the 3' side of the two Ds form a base pair.
- the DNA aptamer has the base sequence set forth in SEQ ID NO: 7 or 8.
- the base X in the base sequence of SEQ ID NO: 6 or 7 is an artificially produced base, and the artificially produced base may be modified with a linker, a medium molecular weight compound, a polymeric compound, a biopolymer, or a polymer having affinity for a biopolymer.
- the second aspect of the present invention provides a carrier on which the DNA aptamer according to the first aspect is immobilized, for use in an apheresis process.
- the subject of the apheresis treatment using the carrier may be sFLT-1 positive blood.
- the disease to which the apheresis treatment using the carrier is applied may be selected from the group consisting of preeclampsia, exudative age-related macular degeneration, central retinal vein occlusion, branch retinal vein occlusion, diabetic macular edema, choroidal neovascularization, malignant tumors, and Duchenne muscular dystrophy.
- the third aspect of the present invention provides an sFLT-1 removal material that contains the DNA aptamer according to the first aspect.
- the fourth aspect of the present invention provides an sFLT-1 removal kit that includes the DNA aptamer according to the first aspect.
- the fifth aspect of the present invention provides a pharmaceutical composition comprising the DNA aptamer according to the first aspect.
- the pharmaceutical composition may be for the treatment and/or prevention of a disease selected from the group consisting of preeclampsia, exudative age-related macular degeneration, central retinal vein occlusion, branch retinal vein occlusion, diabetic macular edema, choroidal neovascularization, malignant tumors, and Duchenne muscular dystrophy.
- a disease selected from the group consisting of preeclampsia, exudative age-related macular degeneration, central retinal vein occlusion, branch retinal vein occlusion, diabetic macular edema, choroidal neovascularization, malignant tumors, and Duchenne muscular dystrophy.
- the DNA aptamer of the present invention that selectively binds to sFLT-1 binds specifically and strongly to sFLT-1. This makes it possible to more efficiently and specifically remove sFLT-1 from the blood.
- the DNA aptamer of the present invention that selectively binds to sFLT-1 can be synthesized by chemical methods. Therefore, compared to synthesis methods using biological techniques, DNA aptamers with uniform quality can be provided at a lower cost.
- DNA aptamer of the present invention that selectively binds to sFLT-1 can provide a carrier for separating sFLT-1 that is cheaper and safer to use.
- FIG. 1 shows the results of binding ability screening by ELOSA for DNA aptamer candidates in one embodiment of the present invention.
- FIG. 1 shows the results of ELOSA binding ability screening of DNA aptamer candidates having modified sequences in one embodiment of the present invention.
- FIG. 1 shows the results of ELOSA binding screening of modified DNA sequences in one embodiment of the present invention.
- FIG. 1 shows the predicted secondary structures of the sequences obtained as a result of binding ability screening of modified DNA sequences.
- FIG. 1 shows the secondary structures and variable bases of sequences obtained as a result of a second selection of modified DNA sequences.
- FIG. 1 shows the results of a binding analysis of a DNA aptamer according to one embodiment of the present invention, using a C6 linker as a biotin linker, to sFLT-1 by surface plasmon resonance (SPR).
- FIG. 1 shows the results of a binding analysis of a DNA aptamer according to one embodiment of the present invention, using a TEG linker as a biotin linker, to sFLT-1 by surface plasmon resonance (SPR).
- FIG. 1 shows the results of stability analysis of the obtained aptamer candidates in human plasma.
- FIG. 1 shows the results of an experiment confirming the ability of DNA aptamer-immobilized Sepharose according to one embodiment of the present invention to remove recombinant sFLT-1.
- FIG. 1 shows the results of an experiment confirming the ability of DNA aptamer-immobilized Sepharose according to one embodiment of the present invention to remove sFLT-1 from the serum of preeclampsia patients.
- DNA aptamers have the following advantages: (1) they are obtained by chemical synthesis, so there is a low risk of biological contamination; (2) they are generally low in antigenicity; (3) because they are DNA, they are sufficiently stable at room temperature under near-neutral conditions free of nucleic acid degrading enzymes (nucleases); and (4) they have almost no inhibitory activity against cytochrome P450, a drug metabolizing enzyme, so they do not affect concomitant drugs, and so their usefulness is expected. DNA aptamers also do not pose the problem of the production of antibodies against antibody drugs, which is one of the issues that arise when long-term treatment using antibodies is required, so they are molecules that are expected to be able to be administered over a long period of time.
- a DNA aptamer is a ligand molecule in which complementary sequences in a DNA oligonucleotide molecule form complementary strands, causing a single-stranded DNA oligonucleotide to form a secondary or tertiary structure, and the three-dimensional structure allows specific and strong binding to a target molecule.
- DNA aptamers have attracted attention as molecules that can inhibit, suppress, or enhance the activity of a target molecule, or selectively detect or extract a target molecule, by binding a DNA aptamer with a specific sequence.
- DNA aptamers have a smaller molecular weight than antibodies, approximately 1/10 or less, they have high affinity and high target selectivity equivalent to antibodies. For this reason, a selective binding material to sFLT-1 that utilizes the properties of DNA aptamers can minimize the occurrence of side effects due to off-targets.
- DNA aptamers can be produced by chemical synthesis, they are considered to be a suitable modality for solving the manufacturing issues associated with antibodies that may have similar target specificity and other functions.
- target molecule refers to a substance that can be a binding target of a DNA aptamer
- sFLT-1 is the target molecule.
- "selectively binds to sFLT-1” includes that the DNA aptamer according to the present embodiment specifically and strongly binds to a target substance.
- the DNA aptamer can be expressed by the value of the dissociation constant KD as an example of an index showing that the DNA aptamer "selectively binds to sFLT-1".
- the dissociation constant KD of the DNA aptamer that selectively binds to sFLT-1 of the present invention is 1-digit nM or less, which is the KD value of a general antibody.
- KD refers to a dissociation constant expressed by k off (dissociation rate)/k on (binding rate). The smaller the KD value, the stronger the affinity to the target molecule, and the smaller the k off value, the more difficult it is to dissociate after binding to the target molecule.
- the inventors obtained multiple candidate DNA aptamer sequences that bind to sFLT-1 by the SELEX method using a DNA library containing the artificial base 7-(2-thienyl)-3H-imidazo[4,5-b]-pyridin-3-yl (hereinafter also referred to as "Ds"). From these candidate sequences, they selected sequences using the binding strength to sFLT-1 as an index in the ELOSA system, and confirmed the binding ability and blood stability of the selected sequences by shortening them and adding mini-hairpin sequences, thereby identifying anti-sFLT-1 aptamer sequences.
- Ds artificial base 7-(2-thienyl)-3H-imidazo[4,5-b]-pyridin-3-yl
- Sepharose beads to which this DNA aptamer was immobilized, they investigated the effect of removing sFLT-1 from inactivated FBS spiked with recombinant sFLT-1 in an amount equivalent to the amount of sFLT-1 in the blood of patients with preeclampsia. It was revealed that sFLT-1 could be removed in an sFLT-1 aptamer-dependent manner, which led to the completion of the present invention. A treatment for preeclampsia using sFLT-1 aptamers has not yet been established.
- the DNA aptamer disclosed herein can provide an sFLT-1 removal device aimed at treating diseases involving sFLT-1, including preeclampsia. Furthermore, when the DNA aptamer disclosed herein is administered into the body, it may be applicable as a treatment for various diseases caused by signals from VEGFR1, which corresponds to the membrane-bound form of sFLT-1.
- sFLT-1 As for sFLT-1, a comparison was made between the removal method using the DNA aptamer according to the present disclosure and the sFLT-1 specific removal (antibody) method described in Patent Document 2.
- Example 1 of Patent Document 2 a column containing 0.1 ml of agarose beads to which 500 ⁇ g of anti-sFLT-1 antibody was immobilized was used to perform an experiment to remove sFLT-1 from 1 ml of amniotic fluid sample from a patient with preeclampsia containing 40 ng of sFLT-1. According to the results of Example 1 of Patent Document 2, the sFLT-1 removal rate after passing through the column three times was confirmed, and the most efficient antibody species (antibody 103) showed a removal rate of 87%.
- Example 3 of Patent Document 2 an experiment using antibody species AG10B showed a removal rate of 98% from horse serum spiked with 40 ng of sFLT-1 as the best result.
- the experimental conditions are different from the removal experiment using the sFLT-1 aptamer shown in Example 8 of this embodiment, and the performance cannot be simply compared.
- the disruption of the sFLT-1/PLGF balance due to excessive removal of sFLT-1 has adverse effects such as arteriosclerosis.
- aptamers are suitable as adsorbents for use in apheresis.
- one of the performance properties of aptamers is low placental permeability, so it is considered that the use of aptamers is preferable in terms of use in pregnant women.
- a "natural base” refers to a nucleic acid base contained in a nucleotide that exists in nature, and is any one of adenine, guanine, cytosine, and thymine.
- an "artificially produced base” or “artificial base” refers to a nucleic acid base that does not exist in nature and is produced by an artificial method.
- 7-(2-thienyl)-3H-imidazo[4,5-b]-pyridin-3-yl (hereinafter referred to as "Ds") contained in the sequence of the DNA aptamer according to this embodiment is an example of an artificial base.
- mini-hairpin sequence refers to a base sequence consisting of 7 to 14 bases that can increase the resistance to degradation by nucleases or increase the thermal stability of a DNA aptamer by increasing the Tm value of the DNA aptamer to which the mini-hairpin sequence is attached (see, e.g., International Publication No. WO 2016/143700).
- the DNA aptamer according to this embodiment is an oligonucleotide having a base sequence that contains the artificial base 7-(2-thienyl)-3H-imidazo[4,5-b]-pyridin-3-yl (Ds) at two positions, and is a molecule that selectively binds to sFLT-1.
- a DNA oligonucleotide having the base sequence shown in Table 1 can be used as the sFLT-1-binding DNA aptamer.
- All of the base sequences listed in Table 1 contain a sequence of 13 to 18 bases between the two Ds.
- the base sequences of SEQ ID NOs: 2 and 5 to 7, which include "FLT7" in the aptamer name, contain a sequence of 13 bases common to the two Ds.
- the base sequences of SEQ ID NOs: 2, 5, and 6 all have three common bases on the 5' side of the 13 bases and 12 common bases on the 3' side, resulting in a common sequence of 30 bases in total.
- the base sequences of SEQ ID NOs: 1 and 4, which include "FLT5" in the aptamer name contain a sequence of 18 bases common to the two Ds.
- at least one of the two Ds is located within a sequence that forms a single strand when the tertiary structure is formed.
- Base X is any unnatural base or artificially produced base, or represents an artificially produced base to which a linker, a low molecular weight compound, a peptide, an oligonucleic acid, an oligosaccharide, a protein or other high molecular weight compound (biopolymer) used in living organisms or a biocompatible polymer is bound.
- “unnatural base” refers to a nucleic acid base that has a structure different from that of natural bases that exist in nature.
- the base sequences of SEQ ID NOs: 6 to 8 have a mini-hairpin sequence consisting of 9 bases at the 3' end.
- base X is located within the mini-hairpin sequence.
- the functional molecules such as the low molecular weight compounds and biopolymers mentioned above, are bound to base X located within the mini-hairpin via a linker, so that when the DNA aptamer forms a tertiary structure, various functional molecules can be introduced without interfering with the site that has binding activity to the target substance.
- the base sequence of any one of SEQ ID NOs: 2 and 5 to 9 may be as shown in Table 1.
- a base sequence having 3 to 7 bases linked to the 5' side of the Ds located on the 5' side of the two Ds and a base sequence having 3 to 7 bases counting from the 10th base from the Ds linked to the 3' side of the Ds located on the 3' side of the two Ds may be any sequence in which they form a base pair.
- CCCCC linked to the 5' side of the Ds located on the 5' side of the two Ds and GGGGG, which are the 10th to 14th bases counting from the Ds, linked to the 3' side of the Ds located on the 3' side form a base pair.
- This relationship in which five bases form a base pair, that is, one or more of the C-G pairs may be replaced with G-C, A-T, or T-A.
- the DNA aptamer having the base sequence described in Table 1 of the present specification may be an oligonucleotide having the full length of the base sequence described in the table.
- the DNA aptamer of this embodiment can be synthesized by a method known in the art.
- the DNA aptamer of this embodiment can be chemically synthesized by a known solid-phase synthesis method.
- the synthesized DNA aptamer is preferably purified by a method known in the art before use. Purification methods include, but are not limited to, gel purification, affinity column purification, and HPLC.
- the base X in the sequence of the DNA oligonucleotide is preferably an artificially produced base.
- an appropriate artificial base it is possible to introduce an amino group, a thiol group, a carboxyl group, an azide group, a hydroxyl group, an alkenyl group, a formyl group, a hydrazide group, a cyano group, etc. as an active functional group provided by the introduction of the artificial base X.
- These active functional groups can be used as they are or after activation to be retained on a carrier that can be used in an apheresis column.
- one end of a linker made of a hydrocarbon chain may be bound to base X, and the other end may be bound to a carrier, thereby holding the DNA aptamer on the carrier.
- base X is a modified T (thymine) or A (adenine).
- the active functional group introduced by base X can be bound to biocompatible polymers such as PEG (polyethylene glycol), POX (poly(2-oxazoline)), PMPC (poly(2-methacryloyloxyethyl phosphorylcholine)), or medium-sized or biopolymers such as peptides, oligonucleotides, and polysaccharides.
- biocompatible polymers such as PEG (polyethylene glycol), POX (poly(2-oxazoline)), PMPC (poly(2-methacryloyloxyethyl phosphorylcholine)
- medium-sized or biopolymers such as peptides, oligonucleotides, and polysaccharides.
- Aptamers whose physical properties have been altered by binding these biocompatible polymers, medium-sized or biopolymers can be used not only in apheresis columns, but also as therapeutic agents for diseases that can be treated by inhibiting the function of sFLT-1.
- Functional groups that can be used to bind medium-sized molecules or biopolymers include azide groups (-N 3 ), amino groups (-NH 2 ), carboxyl groups (-COOH) or their active esters, alkynyl groups (-CC) or cyclic structures containing an alkynyl structure, formyl groups (-CHO), hydrazide groups (-NH-NH 2 ), hydroxyl groups (-OH), thiol groups (-SH), cyano groups (-CN), vinyl groups (-CHCH 2 ), and maleimide groups.
- polymeric compounds examples include polyethylene glycol (PEG) with a molecular weight of 20,000 to 60,000, and any biocompatible polymer with a molecular weight of 20,000 or more.
- PEG polyethylene glycol
- biocompatible polymers are polymers that are not normally used in living organisms, and are safe when placed in the body and do not cause inflammation or toxic reactions.
- medium molecular compounds include peptides, oligonucleic acids, oligosaccharides, proteins, PEG, and any biocompatible polymers with a molecular weight of more than 1,000 and less than 20,000.
- the DNA aptamer according to this embodiment is fixed to a carrier and used in the apheresis process.
- the carrier can be used for apheresis as long as it is made of a material that is stable in the body and has biocompatibility, such as surface-modified silica gel, surface-modified metal, glass, zeolite, polystyrene, polypropylene, polyethylene, acetylated cellulose, agarose, etc.
- the carrier can be in the form of beads, fibers, woven fabric, nonwoven fabric, porous structure, etc.
- the aptamer When immobilizing the DNA aptamer of this embodiment on a carrier, the aptamer can be immobilized at any position on the aptamer as long as the activity of the DNA aptamer is not impaired, and immobilization is not limited to using base X, which is an artificial base.
- the carrier to which the DNA aptamer according to this embodiment is fixed it is expected to be fixed to a suitable carrier with biocompatibility to form an apheresis column, and the column is expected to be effective in removing sFLT-1 from sFLT-1 positive blood.
- the DNA aptamer according to this embodiment may be administered locally or systemically, either unmodified or modified by binding a polymer using the base X in the mini-hairpin structure, and is expected to have the effect of alleviating or suppressing symptoms and treating diseases.
- the pharmaceutical composition of this embodiment can be administered by an appropriate method as long as the active ingredient is not inactivated. For example, it may be administered parenterally, such as by injection, aerosol, application, eye drops, or nasal drops, or it may be administered orally.
- Diseases to which apheresis treatment using the carrier according to this embodiment is applied may be selected from the group consisting of preeclampsia, exudative age-related macular degeneration, central retinal vein occlusion, branch retinal vein occlusion, diabetic macular edema, choroidal neovascularization, malignant tumors, and Duchenne muscular dystrophy.
- Non-Patent Document 1 Non-Patent Document 1
- an apheresis column carrying the DNA aptamer of this embodiment can remove 50% or more of sFLT-1 from the serum of patients with preeclampsia.
- sFLT-1 can be removed more efficiently in a single treatment, providing a treatment method that is more sustained and has a higher therapeutic effect. Details will be explained in the examples below.
- the DNA aptamer according to this embodiment selectively binds to sFLT-1, and can therefore be used as a research reagent for diseases involving sFLT-1. For example, whether in vitro or in vivo, the possibility that sFLT-1 is involved in a physiological phenomenon of interest can be evaluated and examined by tests using the DNA aptamer according to this embodiment, and the cause of the physiological phenomenon can be considered. Furthermore, the DNA aptamer according to this embodiment can be added as a reagent to cell culture medium or administered to animals, and used in a wide range of tests, including reaction systems that inhibit sFLT-1.
- the DNA aptamer that selectively binds to sFLT-1 binds specifically and strongly to sFLT-1. Therefore, compared to conventional non-specific removal methods, it is possible to remove sFLT-1 from the blood more efficiently and specifically.
- DNA aptamer that selectively binds to sFLT-1 can be synthesized by chemical methods. Compared to biological synthesis, chemical synthesis does not require the use of serum or other substances in its production. This means that problems inherent in the production of antibody drugs, such as the risk of biological contamination or quality differences between lots, do not arise, and aptamers with uniform quality can be provided at a lower cost.
- the DNA aptamer that selectively binds to sFLT-1 according to this embodiment, and the carrier on which the DNA aptamer is immobilized, can be stored in a dry state or at room temperature. This provides improved convenience in terms of transportation and storage costs compared to carriers on which protein ligands such as antibodies are immobilized.
- the DNA aptamer used in this example was chemically synthesized by the method described in WO 2013/073602 and WO 2016/143700.
- the DNA aptamer having a base sequence containing an artificial base X according to this example was synthesized by introducing a modified dT amidite via a linker into the X position of the sequences of SEQ ID NOs: 6 and 7 using the method described in WO 2013/073602 and WO 2016/143700.
- Other X substitutions can be synthesized by using commercially available artificial base or modified base amidites.
- Example 1 Selection of DNA aptamers that bind to sFLT-1 using Ds predatormin DNA library
- a DNA library containing the artificial base Ds was prepared according to the predetermining method described in International Publication No. 2013/073602. This DNA library is composed of DNA containing a total of 92 bases consisting of primer sequences arranged at both 3' and 5' ends, a tag sequence, a fixed sequence, and an intermediate portion having a random sequence. The artificial base Ds is incorporated at two positions in the intermediate random sequence, and the position of incorporation can be determined from the tag sequence.
- a DNA library was prepared by chemically synthesizing and mixing sub-libraries having individual tag sequences.
- Protein-SELEX for sFLT-1 was performed on a 1 mL scale using 5000 pmol of the above library as the starting material.
- As the target protein Fctag-attached sFLT-1 or Histag-attached sFLT-1 (both manufactured by SinoBiological) was used depending on the round. After 7 rounds of selection, the obtained DNA was subjected to sequence analysis.
- Example 2 Sequencing of DNA obtained by Protein-SELEX IonPGM sequencing (ThermoFisherScientific) was used to identify the base sequence of the DNA obtained after 7 rounds. When sequences that correctly retained the primer sequences at both ends were extracted from a total of 428,716 reads, the analysis subjects were 134,637 sequences. Based on the extracted sequences, clustering was performed under conditions in which sequences with two base differences were considered to be derived sequences, and the degree of sequence enrichment was confirmed, and five sequences were identified as binding sequence candidates. Each of these candidate sequences was chemically synthesized, and binding ability screening was performed individually.
- Example 3 Binding Ability Screening of Candidate Sequences (ELOSA) Five candidate sequences were screened by binding ability analysis using the ELOSA method with the sequences immobilized on a plate. Specifically, 5 pmol of biotin-labeled sequences were added to a Neutravidin-coated plate (ThermoFisherScientific) and immobilized by shaking at room temperature for 30 minutes. Then, inactivated FBS (fetal bovine serum) was added to the well with the immobilized sequence and the well was blocked by shaking at room temperature for 30 minutes. After blocking, 400 nM of Histag-attached sFLT-1 recombinant protein was added and the binding reaction with the candidate sequence was carried out at room temperature for 30 minutes.
- FBS fetal bovine serum
- Example 4 Alteration of candidate sequences
- the results are shown in FIG. 2.
- 6-2-3-3-biotin used in Example 1 was used as a negative control
- FLT11 was used as a positive control.
- FLT7-1-1 SEQ ID NO: 6
- FLT7-1-2 SEQ ID NO: 7
- the predicted secondary structures of FLT7-1-1 and FLT7-1-2 are shown in Figures 4(a) and (b), respectively.
- Example 5 Secondary selection of DNA aptamers obtained by Protein-SELEX
- a second selection Doped selection
- the secondary structure of the DNA aptamer was estimated.
- selection was performed again using a library prepared at a ratio containing 55% of the base composition of the original sequence obtained in the 1st selection and 15% of the other nucleotides.
- Histag-attached sFLT-1 was used, and 4 rounds were performed on a 1 mL scale using 5000 pmol of the library as the starting material.
- the predicted secondary structure of the sequence obtained by Doped selection is shown in FIG. 5.
- NGS analysis was performed using IonPGM sequencing (ThermoFisherScientific), and the top six sequences with high enrichment rates obtained from the analysis results were individually synthesized and subjected to binding analysis.
- the variable base (pair) was only one base pair consisting of the third base from the 5' end and the third base from the 3' end.
- the sequence of SEQ ID NO: 9 is a sequence in which the third base C from the 5' end is replaced with G, and the third base G from the 3' end is replaced with C.
- Example 6 Binding analysis of DNA aptamer (FLT7-1-2) to sFLT-1
- the binding ability of the DNA aptamer FLT7-1-2 obtained in Example 4 was measured by surface plasmon resonance (SPR) using a Biacore T200 from GE Healthcare. Biotin-labeled dT was introduced at the "X" position of the aptamer sequence.
- the DNA aptamer was prepared by chemical synthesis. In the synthesis, two types of linkers, a C6 linker and a TEG (triethylene glycol) linker, were selected as linkers to be bound to biotin, and aptamers containing each were prepared.
- the biotin-labeled DNA aptamer was mixed with D-PBS, heated to 95°C, and then rapidly cooled to fold (reconstitute) it.
- a streptavidin-coated SA chip (Cytiva) was then used as the SPR sensor chip, and the biotin-labeled DNA aptamer was irreversibly immobilized on the chip, after which its binding to sFLT-1 was analyzed.
- the SPR measurement conditions were a running buffer (D-PBS, 0.05% Tween 20) and a set temperature of 25°C.
- Each DNA aptamer was immobilized on the sensor chip by folding a DNA solution diluted with D-PBS solution to 6.25 nM (heat denatured at 95°C for 5 minutes, then rapidly cooled on ice), followed by adding Tween 20 to a final concentration of 0.05%.
- the DNA solution was immobilized on the SA chip by injecting 2.1 ⁇ L (equivalent to 25 seconds) at a flow rate of 5 ⁇ L/min. After immobilization, the DNA aptamer nonspecifically adsorbed on the SA chip was washed away by injecting 50 mM NaOH solution (5 ⁇ L, 5 times) at a flow rate of 20 ⁇ L/min.
- the interaction between the immobilized DNA aptamer (FLT7-1-2) and sFLT-1 was monitored by injecting 0 nM, 1 nM, 2 nM, 4 nM, 8 nM, 16 nM, 32 nM, 64 nM, and 128 nM sFLT-1 solutions (diluted with running buffer).
- the measurement conditions were a flow rate of 100 ⁇ L/min, a protein injection time of 150 seconds, and a dissociation time of 900 seconds.
- the chip was regenerated (dissociation of bound proteins and refolding of DNA) by injecting 25 ⁇ L (equivalent to 15 seconds) of a 50 mM NaOH solution, followed by running buffer for 10 minutes.
- a cell with no immobilized DNA was used as a reference cell, and its response value was subtracted from the sensorgram of each DNA aptamer.
- Figure 6 shows the results when a C6 linker was used as the biotin linker. As a result of this measurement, the KD value of the obtained DNA aptamer was 210 ⁇ 0.006 pM.
- Example 7 Analysis of stability of DNA aptamer in human plasma
- the stability of the aptamer FLT7-1-2mh (SEQ ID NO: 8), in which the fifth base from the 3' end of FLT7-1-2 was replaced with A, against nucleases contained in human plasma was examined.
- the DNA aptamer (final concentration 720 nM) was mixed so that the human plasma concentration was 96%, and the solution was incubated at 37°C. After 0 hours, 0.5 hours, 1 hour, 3 hours, and 6 hours, 20 ⁇ L of the mixed solution was mixed with 110 ⁇ L of 1 ⁇ TBE, 10M Urea solution to stop the degradation reaction.
- Example 8 Confirmation of the ability of aptamer-immobilized Sepharose to remove recombinant sFLT-1
- the sFLT-1 aptamer-immobilized beads were reacted with inactivated FBS spiked with recombinant sFLT-1 to confirm the rate of recombinant sFLT-1 removal.
- sFLT-1 aptamer having an amino linker at the base at the X position of FLT7-1-2 was mixed with NHS-activated Sepharose beads (Cytiva) to prepare sFLT-1 aptamer-immobilized beads.
- the sFLT-1 aptamer-immobilized beads (100, 200, 300, 400 and 500 ⁇ L slurry) were mixed with 1 mL of inactivated FBS containing 8 ng equivalent of recombinant sFLT-1 (Sino biological) at room temperature for 30 minutes.
- the amount of recombinant sFLT-1 was set to be equivalent to the blood concentration of patients with preeclampsia.
- the amount of sFLT-1 remaining in the supernatant was quantified by ELISA.
- Example 9 Confirmation of the ability of aptamer-immobilized Sepharose to remove sFLT-1 from serum of patients with preeclampsia Using the aptamer-immobilized Sepharose described in Example 8, the sFLT-1 removal rate in the serum of patients with preeclampsia was confirmed. Specifically, taking into consideration the amount of sFLT-1 in the patient serum and the possibility that unknown binding inhibitors may be contained in the serum, the sFLT-1 aptamer-immobilized beads were increased to 600 ⁇ L slurry, and 500 ⁇ L of the patient serum was mixed at room temperature for 30 minutes. Thereafter, sFLT-1 in the supernatant was quantified in the same manner as in the method described in Example 8.
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Abstract
Description
国際公開第2013/073602号に記載のプレデターミン法に従って人工塩基Dsを含むDNAライブラリーの調製を行った。このDNAライブラリーは、3’、5’両末端に配置されたプライマー配列と、タグ配列と、固定配列と、ランダム配列を有する中間部からなる計92塩基の配列を含むDNAで構成される。中間部のランダム配列中の2箇所に人工塩基Dsを組み込んでおり、その組み込み位置は、タグ配列から判定できる。個別のタグ配列を有するサブライブラリーを化学合成し、混合することで、DNAライブラリーを調製した。sFLT-1に対するProtein-SELEXを、上記ライブラリー5000pmolを出発材料として1mLのスケールで実施した。標的タンパク質としてFctag付きsFLT-1またはHistag付きsFLT-1(ともにSinoBiological社製)を、ラウンドに応じて使用した。7ラウンドのセレクション終了後、得られたDNAを配列の解析に供した。
IonPGMsequencing(ThermoFisherScientific)により、7ラウンド後に得られたDNAの塩基配列の特定を行った。総リード(read)数428716配列から両末端のプライマー配列を正しく保持している配列を抽出したところ、解析対象は134637配列であった。抽出した配列を基に、2塩基違いの配列を派生配列とみなす条件でクラスタリングし、配列の濃縮程度を確認したところ、5配列が結合配列候補として挙がった。それらの候補配列をそれぞれ化学合成して、個々に結合能スクリーニングを実施した。
候補配列5種について、配列をプレートに固定したELOSA法による結合能解析によりスクリーニングにかけた。具体的には、5pmolのビオチン標識配列をNeutravidinコーティングプレート(ThermoFisherScientific)に加え、室温で30分振盪することで固定した。その後、配列を固定したwellに非働化FBS(ウシ胎児血清)を加え室温で30分振盪することでブロッキングをした。ブロッキング後、400nMのHistag付きsFLT-1リコンビナントタンパク質を加え、室温で30分間、候補配列との結合反応を行った。その後、1×D-PBST(0.05wt% Tween20)で3回洗浄した。配列に結合したsFLT-1リコンビナントタンパク質の検出は、HRP標識抗Histag抗体(R&D)で検出した。具体的には、非働化FBS中で1000倍希釈したHRP標識抗Histag抗体を加え、遮光下、室温で1時間振盪した。その後、1xD-PBST(0.05wt%Tween20)で3回洗浄した。そこに、Substrate Reagent(R&D)を加え、遮光下、室温で20分間反応させた。その後、2NのH2SO4を加え反応を止め、450nmの吸光度(OD450)を計測することで候補配列とHistag付きsFLT-1との結合を検出した。
アプタマー名:6-2-3-3-biotin
5’-GCACCCAADsTGATTGATCGTGCGGCCTTTAGGDsTTAGAGGCC-3’
アプタマー名:6-2-3-2-biotin
5’-CACCCAADsTGATTGATCGTGTGTCCTTTAGGDsTTAGAGGGCG-3’
実施例3で高い結合能を示した候補配列FLT5およびFLT7について、短鎖化およびミニヘアピン配列付加による改変を行った。Histag付きsFLT-1に対して高い結合能を示した候補配列について、短鎖化を行い、実施例3に記載のELOSA法と同様に、Histag付きsFLT-1に対する結合能を確認した。その結果を図2に示す。ネガティブコントロールとして実施例1で用いた6-2-3-3-biotinを、ポジティブコントロールとしてFLT11を、それぞれ用いた。解析の結果、FLT5-1(配列番号4)およびFLT7-1(配列番号5)が改変前のFLT5およびFLT7のそれぞれと比較して同等の結合能を維持していることが明らかとなった。
実施例4で得られた配列を含むDNAアプタマーFLT7-1-2について、国際公開第2013/073602号の実施例3に記載の方法に準じてセカンドセレクション(Doped selection)を実施し、DNAアプタマーの二次構造の推定を行った。セカンドセレクションでは、1stセレクションで得られたオリジナル配列のそれぞれの塩基組成を55%、その他ヌクレオチドをそれぞれ15%含む割合で調製されたライブラリーを使って、再びセレクションを行った。セレクションでは、Histag付きsFLT-1のみを用い、5000pmolのライブラリーを出発材料として1mLのスケールで4ラウンドを実施した。Doped selectionによって得られた配列の予測される二次構造を図5に示す。実施例2と同様に、IonPGMsequencing(ThermoFisherScientific)を用いたNGS解析を行い、解析結果から得られた濃縮率が高い配列上位6配列について、個々に合成し結合解析を行った。その結果、可変塩基(対)は、5’末端から3番目の塩基および3’末端から3番目の塩基からなる塩基対の一箇所のみであった。配列番号9の配列は、5’末端から3番目の塩基CがGに、3’末端から3番目の塩基GがCに、それぞれ置換された配列である。
実施例4で得られたDNAアプタマーFLT7-1-2の結合能を、GEヘルスケア社のBiacoreT200を用いた表面プラズモン共鳴(SPR)によって測定した。ビオチン標識されたdTをアプタマーの配列の「X」の位置に導入した。DNAアプタマーを化学合成によって調製した。合成にあたっては、ビオチンと結合させるリンカーとして、C6リンカーとTEG(トリエチレングリコール)リンカーの2種類を選択し、それぞれを含むアプタマー調製した。
FLT7-1-2の3’末端から5番目の塩基をAに置換したアプタマーFLT7-1-2mh(配列番号8)のヒト血漿中に含まれる核酸分解酵素に対する安定性を調べた。DNAアプタマー(最終濃度720nM)を、ヒト血漿濃度が96%となるように混合し、この溶液を37℃でインキュベートした。0時間後、0.5時間後、1時間後、3時間後および6時間後に混合溶液20μLを110μLの1×TBE、10MUrea溶液と混合して分解反応を止めた。反応後のサンプルを7MUrea変性12%ポリアクリルアミドゲル電気泳動で分離した後、ゲルをSYBRGOLD(ThermoFisher Scientific)で染色して1本鎖核酸を検出した。ゲル泳動結果を図8に示す。ゲルの染色結果より、6時間インキュベートサンプルにおいても、分解物由来のバンドはほとんど観察されず、全長の状態で安定に存在することが明らかとなった。アフェレーシスにおける血液サンプルとの接触においても安定で、sFLT-1除去能を保持することが示唆された。
sFLT-1アプタマー固定ビーズと、リコンビナントsFLT-1をスパイクした非働化FBSを反応させ、リコンビナントsFLT-1除去率を確認した。具体的には、NHS活性化セファロースビーズ(Cytiva社)に、FLT7-1-2のXの位置の塩基にアミノリンカーを有するsFLT-1アプタマーを混合し、sFLT-1アプタマー固定ビーズを調製した。sFLT-1アプタマー固定ビーズ(100、200、300、400および500μLスラリー)を、8ng相当のリコンビナントsFLT-1(Sino biological)が含まれる非働化FBS1mLと室温で30分間混合した。リコンビナントsFLT-1量は、妊娠高血圧腎症患者の血中濃度と同等に設定した。上清に残存するsFLT-1量をELISA法で定量した。
実施例8に記載したアプタマー固定セファロースを用い、妊娠高血圧腎症患者血清中のsFLT-1除去率を確認した。具体的には、患者血清中のsFLT-1の量や、血清中に未知の結合阻害因子が含まれる可能性を考慮し、sFLT-1アプタマー固定ビーズを600μLスラリーに増やし、患者血清500μLを室温で30分間混合した。その後、実施例8に記載の方法と同様に上清中のsFLT-1を定量した。結果を図10に示す。患者1(TD-PE-004)血清サンプルから約24000pg/mL(59%)、患者2(TD-PE-006)サンプルから約8200pg/mL(57%)のsFLT-1が除去できることが明らかとなり、リコンビナントに限らず、天然型のsFLT-1除去能を有していることが示された。
Claims (12)
- 人工塩基7-(2-チエニル)-3H-イミダゾ[4,5-b]-ピリジン-3-イル(Ds)を2箇所に含む塩基配列を有し、2箇所のDsの間に13個から18個の塩基を含み、三次構造形成時に一本鎖を形成する配列内に2つのDsのうちの少なくとも一方が位置する、sFLT-1に選択的に結合するDNAアプタマー。
- 配列番号1,3または4に記載の塩基配列を有する、請求項1に記載のDNAアプタマー。
- (a)配列番号2または5から9のいずれかに記載の塩基配列を有する、または、
(b)配列番号2または5から9のいずれかに記載の塩基配列において、2個のDsのうち5’側に位置するDsの5’側に連結された、3個から7個の塩基を有する塩基配列と、2個のDsのうち3’側に位置するDsの3’側に連結された、Dsから数えて10番目の塩基から3個から7個の塩基を有する塩基配列とが、塩基対を形成する任意の配列である、請求項1に記載のDNAアプタマー。 - 配列番号7または8に記載の塩基配列を有する、請求項3に記載のDNAアプタマー。
- 配列番号6または7に記載の塩基配列中の塩基Xが人工的に製造された塩基であり、該人工的に製造された塩基が、リンカー、中分子化合物、高分子化合物、生体高分子、または生体高分子に親和性のあるポリマーで修飾されている、請求項3に記載のDNAアプタマー。
- 請求項1から5のいずれか1項に記載のDNAアプタマーが固定化された、アフェレーシス処理に用いられる担体。
- 前記アフェレーシス処理の対象がsFLT-1ポジティブな血液である、請求項6に記載の担体。
- 前記アフェレーシス処理を適用する疾患が、妊娠高血圧腎症、滲出性加齢黄斑変性、網膜中心静脈閉塞症、網膜静脈分枝閉塞症、糖尿病黄斑浮腫、脈絡膜血管新生、悪性腫瘍、デュシェンヌ型筋ジストロフィーからなる群から選択される、請求項6に記載の担体。
- 請求項1から5のいずれか1項に記載のDNAアプタマーを含むsFLT-1除去材。
- 請求項1から5のいずれか1項に記載のDNAアプタマーを含むsFLT-1除去キット。
- 請求項1から5のいずれか1項に記載のDNAアプタマーを含む医薬組成物。
- 妊娠高血圧腎症、滲出性加齢黄斑変性、網膜中心静脈閉塞症、網膜静脈分枝閉塞症、糖尿病黄斑浮腫、脈絡膜血管新生、悪性腫瘍、デュシェンヌ型筋ジストロフィーからなる群から選択される疾患の治療および/または予防のための、請求項11に記載の医薬組成物。
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|---|---|---|---|---|
| US20120215150A1 (en) * | 2011-01-20 | 2012-08-23 | Henry John Smith | Treatment of pre-eclampsia using targeted apheresis |
| WO2013073602A1 (ja) * | 2011-11-18 | 2013-05-23 | 独立行政法人理化学研究所 | 標的タンパク質に結合する核酸断片 |
| WO2016143700A1 (ja) * | 2015-03-06 | 2016-09-15 | タグシクス・バイオ株式会社 | Dnaアプタマーの安定化法 |
| WO2016158851A1 (ja) * | 2015-03-30 | 2016-10-06 | 日産化学工業株式会社 | 血管内皮増殖因子受容体に結合する核酸アプタマー |
| US20180093032A1 (en) * | 2016-08-15 | 2018-04-05 | Henry John Smith | Targeted apheresis using binding agents or ligands immobilized on membranes |
| US20220233755A1 (en) * | 2021-01-16 | 2022-07-28 | Henry J. Smith | Targeted apheresis to treat preeclampsia |
-
2024
- 2024-05-09 WO PCT/JP2024/017306 patent/WO2024232421A1/ja active Pending
- 2024-05-09 CN CN202480031966.3A patent/CN121175423A/zh active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120215150A1 (en) * | 2011-01-20 | 2012-08-23 | Henry John Smith | Treatment of pre-eclampsia using targeted apheresis |
| WO2013073602A1 (ja) * | 2011-11-18 | 2013-05-23 | 独立行政法人理化学研究所 | 標的タンパク質に結合する核酸断片 |
| WO2016143700A1 (ja) * | 2015-03-06 | 2016-09-15 | タグシクス・バイオ株式会社 | Dnaアプタマーの安定化法 |
| WO2016158851A1 (ja) * | 2015-03-30 | 2016-10-06 | 日産化学工業株式会社 | 血管内皮増殖因子受容体に結合する核酸アプタマー |
| US20180093032A1 (en) * | 2016-08-15 | 2018-04-05 | Henry John Smith | Targeted apheresis using binding agents or ligands immobilized on membranes |
| US20220233755A1 (en) * | 2021-01-16 | 2022-07-28 | Henry J. Smith | Targeted apheresis to treat preeclampsia |
Non-Patent Citations (2)
| Title |
|---|
| KOSEKI, CHIZUKO: "Development of apheresis column for treatment of preeclampsia using sFlt-1 specific DNA aptamer ligand", JAPANESE JOURNAL OF APHERESIS, JAPANESE SOCIETY FOR APHERESIS, JP, vol. 42, no. 1, 1 January 2023 (2023-01-01), JP , pages 56, XP009558909, ISSN: 1340-5888 * |
| OWARI, KENSUKE ET AL.: "Attempt at Development of Next-Generation Apheresis Utilizing Artificial Base-Introduced DNA Aptamers", JAPANESE JOURNAL OF APHERESIS, JAPANESE SOCIETY FOR APHERESIS, JP, vol. 41, 12 November 2022 (2022-11-12), JP , pages 118, XP009558910, ISSN: 1340-5888 * |
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|---|---|
| CN121175423A (zh) | 2025-12-19 |
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