WO2017073536A1 - vWFに結合するDNAアプタマー - Google Patents
vWFに結合するDNAアプタマー Download PDFInfo
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- WO2017073536A1 WO2017073536A1 PCT/JP2016/081518 JP2016081518W WO2017073536A1 WO 2017073536 A1 WO2017073536 A1 WO 2017073536A1 JP 2016081518 W JP2016081518 W JP 2016081518W WO 2017073536 A1 WO2017073536 A1 WO 2017073536A1
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- A61K31/7115—Nucleic acids or oligonucleotides having modified bases, i.e. other than adenine, guanine, cytosine, uracil or thymine
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- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
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- C12N2310/00—Structure or type of the nucleic acid
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- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/745—Assays involving non-enzymic blood coagulation factors
- G01N2333/755—Factors VIII, e.g. factor VIII C [AHF], factor VIII Ag [VWF]
Definitions
- the present invention relates to a DNA aptamer that binds to vWF containing an artificial base, a pharmaceutical composition containing the DNA aptamer, a method for detecting vWF using the DNA aptamer, and the like.
- Nucleic acid fragments that have binding activity to target molecules are called nucleic acid aptamers and are expected to be widely applied to medicine as nucleic acid drugs.
- Nucleic acid aptamers can be generated by in-vitro selection (SELEX method) for selecting and isolating nucleic acid fragments that bind to a target molecule from a nucleic acid fragment library composed of random base sequences.
- vWF is one of the blood coagulation factors present in the blood, and its genetic mutation is involved in von Willebrand disease, etc., and acquired thrombotic thrombocytopenia due to autoantibody production to vWF. It is known that purpura and the like are caused.
- Some nucleic acid aptamers for vWF have been developed so far (Non-patent Documents 1 and 2).
- conventional nucleic acid aptamers have only four types of bases compared to antibodies that are proteins consisting of 20 types of amino acids, so their variations are limited, binding ability, dissociation rate, and The performance such as stability was not satisfactory. Therefore, in order to use the nucleic acid aptamer in the medical field including treatment and diagnosis, it is important to improve these performances.
- the present inventor targeting vWF, by carrying out two types of SELEX methods (predetermin method and random library method described in WO2013 / 073602) using artificial base pair technology developed by the present inventor, A DNA aptamer containing an artificial base that strongly binds to vWF was obtained. Further, as a result of further research on the obtained DNA aptamer, the binding ability (for example, K D which is 10 times or more lower) in terms of K D and / or k off compared to the conventional nucleic acid aptamer ARC1172. And / or k off ). Further, the obtained DNA aptamer had an excellent Tm value and / or nucleolytic enzyme resistance.
- a DNA aptamer that binds to a vWF protein comprising the following base sequence (i) or (ii): (I) a nucleotide sequence represented by any of SEQ ID NOs: 13 to 16, 19 and 20, or (ii) a nucleotide sequence represented by (i) wherein 7- (2-thienyl) -3H-imidazo [4,5 -b] A nucleotide sequence in which one or several nucleotides are added, deleted, and / or substituted at positions other than pyridine-3-yl.
- the mini hairpin structure is The following nucleic acid regions (A) to (C) linked in order from the 5 ′ end to the 3 ′ end: (A) a first nucleic acid region consisting of 2 to 5 arbitrary nucleotides, (B) a second nucleic acid region comprising a base sequence of GNA or GNNA (where each N is independently G, T, A or C), and (C) complementary to the first nucleic acid region Consisting of a third nucleic acid region consisting of a typical base sequence, And, the first nucleic acid region and the third nucleic acid region are constituted by a stem portion and a loop portion consisting of the second nucleic acid region, which are base paired with each other, The DNA aptamer according to any one of (1) to (3).
- a DNA aptamer that binds to the vWF protein comprising the following base sequence (i) or (ii): (I) a nucleotide sequence represented by SEQ ID NO: 18 or 21, or (ii) a nucleotide sequence represented by (i), wherein 7- (2-thienyl) -3H-imidazo [4,5-b] pyridine-3- A nucleotide sequence in which one or several nucleotides are added, deleted, and / or substituted at a position other than yl.
- a DNA aptamer that binds to the vWF protein comprising the base sequence according to any one of (1) to (5).
- a DNA aptamer that binds to the vWF protein comprising the following base sequence (I) or (II): (I) a nucleotide sequence represented by any one of SEQ ID NOs: 1 to 4, 9 and 11, or (II) a nucleotide sequence represented by (I), wherein 7- (2-thienyl) -3H-imidazo [4,5 -b] A nucleotide sequence in which one or several nucleotides are added, deleted, and / or substituted at positions other than pyridine-3-yl.
- the DNA aptamer according to (7), wherein the base sequence of (I) is the sequence shown in SEQ ID NO: 1 or 11.
- the mini hairpin structure is The following nucleic acid regions (A) to (C) linked in order from the 5 ′ end to the 3 ′ end: (A) a first nucleic acid region consisting of 2 to 5 arbitrary nucleotides, (B) a second nucleic acid region comprising a base sequence of GNA or GNNA (where each N is independently G, T, A or C), and (C) complementary to the first nucleic acid region Consisting of a third nucleic acid region consisting of a typical base sequence, And, the first nucleic acid region and the third nucleic acid region are constituted by a stem portion and a loop portion consisting of the second nucleic acid region, which are base paired with each other, (7)
- a DNA aptamer that binds to the vWF protein comprising the following base sequence (I) or (II): (I) In the base sequence shown in SEQ ID NO: 12, or (II) In the base sequence shown in (I), other than 7- (2-thienyl) -3H-imidazo [4,5-b] pyridine-3-yl A nucleotide sequence in which one or several nucleotides are added, deleted, and / or substituted at the position. (12) A DNA aptamer that binds to a vWF protein, comprising the base sequence according to any one of (7) to (11). (13) A vWF protein detection agent comprising the DNA aptamer according to any one of (1) to (12).
- a kit for detecting vWF protein comprising the DNA aptamer according to any one of (1) to (12).
- a pharmaceutical composition comprising the DNA aptamer according to any one of (1) to (12).
- Treatment and / or treatment of a disease selected from the group consisting of thrombosis, thrombotic thrombocytopenic purpura, intracranial embolism, cerebral embolism, carotid artery stenosis, thrombotic microangiopathy, and acute myocardial infarction The pharmaceutical composition according to (15), for prevention.
- a method for detecting vWF protein comprising:
- the present invention provides a DNA aptamer for vWF that is superior in binding ability, dissociation rate, and / or stability to conventional nucleic acid aptamers. Also provided are vWF detection methods, methods for assisting diagnosis of the presence or absence of diseases such as thrombosis using the DNA aptamer of the present invention, and pharmaceutical compositions for the treatment and / or prevention of diseases such as thrombosis. Is done.
- Example 3 The predicted secondary structure of each DNA aptamer prepared in Example 3 is shown. Based on vWF1-DsDsDs (SEQ ID NO: 1) indicated by a, 3'-terminal Ds is replaced by A, vWF1-DsDsA (SEQ ID NO: 2) indicated by b, and intermediate part Ds is indicated by c vWF1-DsADs (SEQ ID NO: 3), vWF1-ADsDs (SEQ ID NO: 4) indicated by d in which Ds on the 5 ′ end side are replaced with A, and e in which Ds on the middle part and 3 ′ end side are replaced with A vWF1-DsAA (SEQ ID NO: 5) was prepared.
- the artificial base Ds is indicated by a square, and the site where Ds is replaced by A is indicated by an arrowhead.
- a bold line indicates a base capable of forming a Watson-Crick base pair
- a normal line indicates that the base is linked via a phosphodiester bond.
- the meanings of the bold line and the normal line are the same as those in FIGS. 1-2, 3, 6-1 and 6-2 below.
- the predicted secondary structure of each DNA aptamer prepared in Example 3 is shown.
- vWF1-DsDsDs SEQ ID NO: 1
- vWF1-ADsA SEQ ID NO: 6
- f Ds on the 5 ′ end side and 3 ′ end side are replaced with A
- Ds on the 5 ′ end side and the middle part VWF1-AADs SEQ ID NO: 7
- vWF1-AAA SEQ ID NO: 8
- stem part VWF1-R1Ds SEQ ID NO: 9 indicated by i excluding the AT pair at the end of was prepared.
- ARC1172 SEQ ID NO: 10
- j which is an existing vWF-binding DNA aptamer
- the artificial base Ds is indicated by a square, and the site where Ds is replaced by A is indicated by an arrowhead.
- FIG. 2A shows the result of DNA aptamer staining with SYBR GOLD upon electrophoresis.
- 2B is a graph showing the shift rate (binding rate) of each oligo as a relative shift rate, with the gel shift rate of ARC1172 (the ratio of the complex band when the band of the entire lane is 100%) being 1.0. It is.
- the binding reaction was performed at 37 ° C and the electrophoresis was performed at 4 ° C.
- the complex indicates a DNA aptamer bound to the vWF A1 domain, and the release indicates a free DNA aptamer.
- a to j show the results when the aptamers shown by a to j in FIGS. 1-1 and 1-2, respectively.
- Example 4 the secondary structure of the DNA aptamer used for measuring the binding activity by SPR is shown.
- vWF1-DsDsDs (SEQ ID NO: 1) indicated by a, vWF1-AAA (SEQ ID NO: 8) indicated by h in which three Ds are replaced by A, and a part of stem region AT pair is replaced by GC pair k VWF1-DsDsDs-GC (SEQ ID NO: 11) and vWF1-DsDsDs-mhGC (SEQ ID NO: 12) indicated by l with a mini hairpin added to the 3 ′ end of vWF1-DsDsDs-GC were prepared.
- the binding analysis result with respect to vWF * A1 domain protein by SPR of various DNA aptamers is shown.
- B shows the result of vWF1-DsDsDs-GC
- C shows the result of vWF1-DsDsDs-mhGC
- D shows the result of vWF1-AAA
- E shows the result of ARC1172.
- A shows the standard absorbance of the DNA aptamer at each temperature
- B shows the first derivative of the standardized absorbance of the DNA aptamer at each temperature
- 2 shows the predicted secondary structure of the DNA aptamer prepared in Example 8.
- vWF2-DsDsDs (SEQ ID NO: 13) indicated by m
- Ds in the middle part was replaced with A
- vWF2-DsADs (SEQ ID NO: 14) indicated by n
- Ds on the middle part and 3 ′ end side were replaced with A vWF2-DsAA (SEQ ID NO: 15) indicated by o
- vWF2-AADs (SEQ ID NO: 16) indicated by p in which Ds at the 5 ′ terminal side and the middle part were replaced with A were prepared.
- the site where Ds is replaced by a square and Ds is replaced by A is indicated by an arrowhead. 2 shows the predicted secondary structure of the DNA aptamer prepared in Example 8.
- vWF2-DsDsDs (SEQ ID NO: 13), vWF2-AAA (SEQ ID NO: 17) indicated by q with all Ds replaced with A, AT base pair in stem part is replaced with GC base pair, and 3 'end VWF2-DsDsDsDs-mhGC (SEQ ID NO: 18) indicated by r with the mini hairpin DNA added to it, and the loop part of the intermediate part of WF2-DsDsDs-mhGC (SEQ ID NO: 18) as the loop part sequence of the mini hairpin DNA (5'- VWF2-DsDsDs-2mhGC (SEQ ID NO: 21) indicated by s substituted with GAA-3 ′) was prepared.
- ARC1172 SEQ ID NO: 10
- j which is an existing vWF-binding DNA aptamer
- Ds is a square
- Ds is replaced by A
- AT pair is replaced by GC pair with arrowhead
- minihairpin added site is replaced with arrowheaded square.
- a to C are the results of DNA aptamer staining with SYBR GOLD when electrophoresis was performed at 4 ° C./300 V, 25 ° C./40 W, and 37 ° C./40 W, respectively.
- the complex indicates a DNA aptamer bound to the vWF A1 domain, and the release indicates a free DNA aptamer.
- m to s show the results when the aptamers shown by m to s in FIGS. 6-1 and 6-2 are used.
- j indicates the result when ARC1172 is used.
- the binding analysis result with respect to vWF * A1 domain protein by SPR of various DNA aptamers is shown.
- A shows the result of ARC1172
- B shows the result of vWF2-DsDsDs
- C shows the result of vWF2-DsDsDs-2mhGC.
- the stability analysis result with respect to the nucleolytic enzyme in human serum of various DNA aptamers is shown. “C” at the left end of the lane indicates “control” and shows the result of only the serum not added with DNA aptamer. Unresolved bands are indicated by arrowheads.
- A shows the result of vWF2-DsDsDs
- B shows the result of vWF2-DsDsDs-mhGC
- C shows the result of vWF2-DsDsDs-2mhGC
- D shows the result of vWF2-AAA
- E shows the result of ARC1172.
- the measurement result of Tm value of various DNA aptamers is shown.
- A shows the standard absorbance of the DNA aptamer at each temperature
- B shows the first derivative of the standardized absorbance of the DNA aptamer at each temperature.
- nucleic acid or “nucleic acid molecule” refers to a biopolymer composed of nucleotides as structural units and linked by phosphodiester bonds.
- natural nucleotide refers to a nucleotide that exists in nature and is composed of a deoxyribonucleotide having a natural base of any one of adenine, guanine, cytosine and thymine, and adenine, guanine, Examples thereof include RNA composed of ribonucleotides having a natural base of either cytosine or thymine, or a combination thereof.
- non-natural nucleotide refers to a nucleotide that does not exist in nature, the base of which is an artificial base.
- the phosphate group and sugar constituting the non-natural nucleotide in the present invention are structurally identical to the phosphate group and sugar of the natural nucleotide.
- an “artificial base” or “base analog” is an artificially constructed chemical substance having properties similar to those of a natural base constituting a natural nucleotide, and is similar to a natural base. And a base analog (hereinafter referred to as “complementary artificial base”) that can form an artificial base pair.
- “artificial base pairing” refers to base pairing formed by a pair of complementary artificial bases such as adenine and thymine, adenine and uracil, or guanine and cytosine, which are natural bases.
- Artificial base pairing is based on chemical bonds via hydrogen bonds found in base pairing between natural bases, physical bonds via fitting based on the molecular structure between artificial bases, and hydrophobic interactions. Including stacking effect.
- the “characteristics similar to natural bases” possessed by artificial bases include the ability to replicate or transcribe nucleic acids (including reverse transcription) by complementation by artificial base pairing.
- Artificial bases like natural bases, have exclusive selectivity in artificial base pairing. Therefore, if a non-natural nucleotide having a pair of complementary artificial bases exists in a substrate nucleotide, even a nucleic acid molecule containing a non-natural nucleotide can be accurately detected in the same manner as a natural nucleotide due to complementarity between artificial bases. Can be duplicated and transcribed. Therefore, it is possible to amplify DNA molecules by a nucleic acid amplification method such as PCR while containing non-natural nucleotides.
- the artificial base include Ds (7- (2-thienyl) -3H-imidazo [4,5-b] pyridine-3-yl; referred to herein as “Ds”), Pn (2-nitropyrrole -1-yl; referred to herein as “Pn”), Pa (2-formyl-1H-pyrrole-1-yl; referred to herein as “Pa”), P (2-amino-imidazo [1 , 2-a] -1,3,5-triazin-4 (8H) -one; referred to herein as “P”), Z (6-amino-5-nitro-2 (1H) -pyridone; "Z” in the specification), 5SICS (6-methylisoquinoline-1 (2H) -thione; referred to herein as "5SICS”), NaM (3-methoxynaphthalen-2-yl; referred to herein as "NaM And MMO2 (2-methoxy-4-methylphenyl; referred to herein as “MMO
- An artificial base is a natural base that is structurally and / or close in nature to a complementary artificial base when the substrate does not contain a non-natural nucleotide having a complementary artificial base during replication or transcription.
- base pairing can be performed.
- the non-natural nucleotide in the template nucleic acid molecule is replaced with the natural nucleotide after replication or transcription.
- Ds it is known that it is replaced with A or T.
- modified base means a base that has been chemically chemically modified.
- Modified bases include, for example, modified pyrimidines (eg, 5-hydroxycytosine, 5-fluorouracil, 4-thiouracil, 5- (3-indole-2-ethyl) uracil, 5- (4-hydroxyphenyl-2-ethyl) Uracil), modified purines (eg 6-methyladenine, 6-thioguanosine) and other heterocyclic bases.
- modified pyrimidines eg, 5-hydroxycytosine, 5-fluorouracil, 4-thiouracil, 5- (3-indole-2-ethyl) uracil, 5- (4-hydroxyphenyl-2-ethyl) Uracil
- modified purines eg 6-methyladenine, 6-thioguanosine
- a “DNA aptamer” is an aptamer composed of DNA, and is based on a secondary structure of a single-stranded nucleic acid molecule through a hydrogen bond or the like, and a three-dimensional structure formed based on a tertiary structure.
- the DNA aptamer can be a function inhibitor of the target molecule.
- target molecule function refers to inhibition of biological functions such as catalytic function or gene expression control function (including control of transcription, translation, transport, etc.) and apoptosis control function of target molecule. Or to suppress.
- target molecule refers to a substance that can be a binding target of a DNA aptamer.
- vWF is exemplified as the target molecule.
- vWF refers to a von Willebrand factor protein (also referred to herein as “vWF protein”).
- vWF is one of the blood clotting factors present in the blood, and its genetic mutation is involved in various diseases such as von Willebrand disease, and acquired thrombotic platelets by the production of autoantibodies to vWF. It is known that reduced purpura and the like are caused.
- the biological species from which vWF is derived is not limited. For example, mammals, for example, primates such as humans and chimpanzees, laboratory animals such as rats and mice, livestock such as pigs, cows, horses, sheep, and goats. Examples include animals and pets such as dogs and cats, preferably human vWF.
- vWF is, for example, (a) an amino acid sequence represented by SEQ ID NO: 28, (b) an amino acid sequence in which one or several amino acids are added, deleted, and / or substituted in the amino acid sequence represented by SEQ ID NO: 28, Or (c) 70% or more, 80% or more, preferably 90% or more, 95% or more, 97% or more, 98% or more, or 99% or more identity to the amino acid sequence represented by SEQ ID NO: 28
- An amino acid sequence having vWF may consist of any of these amino acid sequences.
- the identity value indicates a value calculated by default setting using software (for example, FASTA, DANASYS, and BLAST) that calculates identity between a plurality of sequences.
- the A1 domain of vWF means a domain in vWF that has the ability to bind to the GPIb receptor on platelets.
- the A1 domain of vWF includes, for example, (a) the amino acid sequence of positions 1238 to 1481 of SEQ ID NO: 28, and (b) the addition or deletion of one or several amino acids in the amino acid sequence of positions 1238 to 1481 of SEQ ID NO: 28 For example, 70% or more, 80% or more, preferably 90% or more, preferably 95% or more with respect to the lost and / or substituted amino acid sequence, or (c) the amino acid sequence of positions 1238 to 1481 of SEQ ID NO: 28, It includes amino acid sequences having 97% or more, 98% or more, or 99% or more identity.
- the A1 domain of vWF may consist of any of these amino acid sequences.
- “several” means, for example, 1 to 6, 1 to 5, 1 to 4, 1 to 3, or 1 to 2.
- mini hairpin structure means that the following three nucleic acid regions of the first nucleic acid region, the second nucleic acid region, and the third nucleic acid region are in order from the 5 ′ end to the 3 ′ end. It has the structure connected to.
- Mini-hairpin DNA can increase the thermal stability of a DNA aptamer by increasing its degradation resistance to nucleolytic enzymes and / or increasing the Tm value of the DNA aptamer.
- the “first nucleic acid region” is a nucleic acid region consisting of 2 to 5 arbitrary nucleotides.
- the nucleotide refers to a deoxyribonucleotide having a base of guanine (G), adenine (A), cytosine (C) or thymine (T).
- the base of this nucleic acid region is preferably guanine or cytosine. This is because when the stem structure is formed with the third nucleic acid region described later, the Tm value increases as the GC content increases, and the stem structure can be stably retained. Therefore, it is most preferable that the entire base sequence of the first nucleic acid region is composed of G and / or C.
- the “second nucleic acid region” is a nucleic acid region consisting of a 5′-GNA-3 ′ or 5′-GNNA-3 ′ base sequence.
- Each N in the sequence independently consists of any of the natural bases (G, A, T, or C), for example T.
- the “third nucleic acid region” is a nucleic acid region having a base sequence complementary to the first nucleic acid region. Therefore, the base sequence of the third nucleic acid region is determined by the base sequence of the first nucleic acid region, and the first nucleic acid region and the third nucleic acid region form a base pair in the molecule. As a result, the first nucleic acid region and the third nucleic acid region have completely stem-paired stem portions, and the second nucleic acid region existing between the first and third nucleic acid regions has a loop portion. As a whole, a mini hairpin type DNA consisting of 7 to 14 nucleotides is formed. As an example of the mini hairpin type DNA, DNA having a base sequence shown in CGCGTAGCG (SEQ ID NO: 26) can be mentioned.
- DNA aptamer that binds to vWF comprising the following base sequence (i) or (ii): (I) any one of SEQ ID NOs: 13 to 16, 19 and 20, preferably a base sequence represented by any of SEQ ID NOs: 13, 14, 19 and 20, or (ii) a base sequence represented by (i) A nucleotide sequence in which one or several nucleotides are added, deleted, and / or substituted at a position other than Ds.
- the base sequence (i) includes 1 to 5, for example, 1 to 4, 1 to 3, 1 to 2, or 1 base pair, for example, a GC pair at its end. Terminal base pairs can increase the Tm value of DNA aptamers and improve thermal stability.
- the base sequence of (i) is, in addition to or in place of these base pairs, a sequence that forms a mini hairpin structure (hereinafter, also referred to as “mini hairpin sequence”), for example, It may be included on the 3 ′ end side.
- a sequence shown in SEQ ID NO: 18 in which a mini hairpin sequence is added to the sequence shown in SEQ ID NO: 19, and a mini hairpin in the sequence shown in SEQ ID NO: 20 examples include the sequence shown in SEQ ID NO: 21 with the sequence added.
- the present invention provides the nucleotide sequence shown in SEQ ID NO: 18 or 21, or the nucleotide sequence shown in SEQ ID NO: 18 or 21, with one or several nucleotides added or missing at positions other than Ds.
- the present invention relates to a DNA aptamer that binds to vWF, including a deleted, substituted, and / or inserted nucleotide sequence.
- the DNA aptamer of the present invention consists of the above base sequence (i) or (ii), or a base sequence obtained by adding a base pair and / or a mini hairpin sequence to the end of the base sequence.
- the DNA aptamer of the present invention containing the base sequence (i) or (ii) binds to vWF, for example, the A1 domain of vWF.
- DNA aptamers of the present invention comprising a nucleotide sequence of (i) or (ii) in terms of the dissociation constant K D and / or off-rate k off, may have the ability to bind to excellent vWF.
- the K D refer to the dissociation constant is represented by k off (dissociation rate) / k on (association rate).
- the DNA aptamer of the present invention containing the base sequence of (i) or (ii) is 1.0 ⁇ 10 ⁇ 7 , 1.0 ⁇ 10 ⁇ 8 , 1.0 ⁇ 10 ⁇ 9 , preferably 5.0 ⁇ in the binding analysis with vWF by Biacore.
- 10 -10, 3.0 ⁇ 10 -10 may have a 1.0 ⁇ 10 -10, or 8.0 ⁇ 10 -11 M or less for K D.
- the DNA aptamer of the present invention containing the base sequence of (i) or (ii) is 1.0 ⁇ 10 ⁇ 1 , preferably 9.0 ⁇ 10 ⁇ 2 , 8.0 ⁇ 10 ⁇ 2 , 7.0 ⁇ in Biacore binding analysis with vWF. It may have a k off of 10 ⁇ 2 , 6.0 ⁇ 10 ⁇ 2 , or 5.0 ⁇ 10 ⁇ 2 (1 / Ms) or less.
- the present invention relates to a DNA aptamer that binds to vWF, comprising the following base sequence (I) or (II): (I) any one of SEQ ID NOS: 1-4, 9, and 11, preferably the nucleotide sequence represented by SEQ ID NO: 1 or 11, or (II) 1 or 1 at a position other than Ds in the nucleotide sequence represented by (I) A nucleotide sequence in which several nucleotides are added, deleted, and / or substituted.
- the base sequence (I) includes 1 to 5, for example, 1 to 4, 1 to 3, 1 to 2, or 1 base pair, for example, a GC pair at its end. Terminal base pairs can increase the Tm value of DNA aptamers and improve thermal stability.
- the base sequence of (I) may contain a mini hairpin sequence in addition to these base pairs or in place of these base pairs, for example, on the 3 ′ end side.
- sequence in which a mini hairpin sequence is added to the sequence (I) is the sequence shown in SEQ ID NO: 12 in which a mini hairpin sequence is added to the sequence shown in SEQ ID NO: 11.
- the present invention provides the nucleotide sequence represented by SEQ ID NO: 12, or the nucleotide sequence represented by SEQ ID NO: 12, wherein one or several nucleotides are added, deleted, substituted, or substituted at positions other than Ds. And / or a DNA aptamer that binds to vWF, comprising an inserted base sequence.
- the DNA aptamer of the present invention consists of the base sequence (I) or (II), or a base sequence in which a base pair and / or a mini hairpin sequence is added to the end of the base sequence.
- the DNA aptamer of the present invention containing the base sequence (I) or (II) binds to vWF, for example, the A1 domain of vWF.
- the DNA aptamer of the present invention containing the base sequence (I) or (II) can have an excellent ability to bind to vWF, particularly in terms of the dissociation rate k off .
- the DNA aptamer of the present invention containing the base sequence of (I) or (II) is 1.0 ⁇ 10 ⁇ 1 , 1.0 ⁇ 10 ⁇ 2 , preferably 5.0 ⁇ 10 ⁇ 3 , preferably by binding analysis with vWF by Biacore, It may have a k off of 4.0 ⁇ 10 ⁇ 3 , 3.0 ⁇ 10 ⁇ 3 , or 2.0 ⁇ 10 ⁇ 3 (1 / Ms) or less.
- the DNA aptamer of the present invention containing the base sequence of (I) or (II) is 1.0 ⁇ 10 ⁇ 6 , 1.0 ⁇ 10 ⁇ 7 , 1.0 ⁇ 10 ⁇ 8 , preferably 1.0 ⁇ 10 ⁇ 8 , preferably by Biacore binding analysis with vWF 5.0 ⁇ 10 -9, 4.0 ⁇ 10 -9, may have a 3.0 ⁇ 10 -9, or 2.0 ⁇ 10 -9 M or less for K D.
- the length of the DNA aptamer (hereinafter also simply referred to as “the DNA aptamer of the present invention”) containing the sequence (i) or (ii), or (I) or (II) is, for example, 150 mer or less, 140 mer or less, 130 mer or less, 120 mer or less, 110 mer or less, preferably 100 mer or less, 90 mer or less, 80 mer or less, 70 mer or less, 60 mer or less, or 50 mer or less.
- the DNA aptamer of the present invention may optionally contain base analogs, other artificial bases, other modified bases, etc. in addition to Ds.
- the DNA aptamer of the present invention includes other substances such as polyethylene glycol (PEG) (for example, PEG polymer of about 20 to about 60 kDa), amino acids, peptides, invertedindT, lipids, dyes, fluorescent substances, enzymes, radioactive substances, It may be modified by adding biotin or the like. These substances may be linked via a known linker as necessary. Examples of the linker in the present specification include a nucleotide linker, a peptide linker, and a linker containing a disulfide bond. It is known that the half-life of a DNA aptamer can generally be extended by linking PEG.
- PEG polyethylene glycol
- the method for producing the DNA aptamer of the present invention is not particularly limited. Any method known in the art may be used.
- the DNA aptamer of the present invention can be chemically synthesized based on the above sequence according to a known solid phase synthesis method. See, for example, Current-Protocols-in-Nucleic-Acid-Chemistry, Volume 1, and Section 3 for the chemical synthesis of nucleic acids.
- many life science manufacturers for example, Takara Bio Inc., Sigma-Aldrich® Corporation, etc.
- the DNA aptamer may be prepared by ligating the fragments by intramolecular annealing, ligase ligation, or the like.
- the DNA aptamer of the present invention after chemical synthesis is preferably purified by a method known in the art before use.
- the purification method include a gel purification method, an affinity column purification method, and an HPLC method.
- composition comprising a DNA aptamer
- the invention relates to a pharmaceutical composition comprising a DNA aptamer of the invention.
- the pharmaceutical composition of the present invention can also contain one or more other drugs as long as the DNA aptamer of the present invention does not lose the binding ability to vWF.
- the present invention relates to a pharmaceutical composition for delivering a drug to a lesion site, comprising a DNA aptamer and another drug.
- Other agents may be conjugated to the DNA aptamer, thereby making it possible to efficiently deliver the agent to the lesion site using the ability of the DNA aptamer to bind to vWF.
- the method for binding the DNA aptamer and the drug is not limited.
- vWF-related diseases include thrombosis, thrombotic thrombocytopenic purpura, intracranial embolism, cerebral embolism, carotid artery stenosis, thrombotic microangiopathy, and acute myocardial infarction.
- a therapeutic effect is expected by administering the pharmaceutical composition to a subject suffering from these diseases, and a prophylactic effect is expected by administering the pharmaceutical composition to a subject at risk of suffering from these diseases.
- the pharmaceutical composition of the present invention can contain a pharmaceutically acceptable carrier.
- “Pharmaceutically acceptable carrier” refers to a substance that is added in a range that facilitates formulation of a pharmaceutical composition ordinarily used in the field of pharmaceutical technology and application to a living body and does not inhibit or suppress its action.
- Carriers include, for example, excipients, binders, disintegrants, fillers, emulsifiers, flow control agents, lubricants, or stabilizers.
- excipient examples include sugars such as monosaccharides, disaccharides, cyclodextrins and polysaccharides (specifically, but not limited to, glucose, sucrose, lactose, raffinose, mannitol, sorbitol, inositol, Including dextrin, maltodextrin, starch and cellulose), metal salts (eg, sodium phosphate or calcium phosphate, calcium sulfate, magnesium sulfate), citric acid, tartaric acid, glycine, low, medium, high molecular weight polyethylene glycol (PEG), Pluronics, or combinations thereof.
- sugars such as monosaccharides, disaccharides, cyclodextrins and polysaccharides (specifically, but not limited to, glucose, sucrose, lactose, raffinose, mannitol, sorbitol, inositol, Including dextrin, mal
- binder examples include starch paste using corn, wheat, rice, or potato starch, gelatin, tragacanth, methylcellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, and / or polyvinylpyrrolidone.
- disintegrant examples include the starch, carboxymethyl starch, cross-linked polyvinyl pyrrolidone, agar, alginic acid, sodium alginate or salts thereof.
- filler examples include the sugar and / or calcium phosphate (for example, tricalcium phosphate or calcium hydrogen phosphate).
- emulsifier examples include sorbitan fatty acid ester, glycerin fatty acid ester, sucrose fatty acid ester, and propylene glycol fatty acid ester.
- Examples of the “flow additive modifier” and “lubricant” include silicate, talc, stearate or polyethylene glycol.
- antioxidants such as ascorbic acid and sulfite
- saccharides such as trehalose and glucose
- the pharmaceutical composition of the present invention may contain, in addition to the above-mentioned additives, a flavoring agent, a solubilizing agent (solubilizing agent), a suspending agent, a diluent, a surfactant, an absorption enhancer (for example, Quaternary ammonium salts, sodium lauryl sulfate, etc.), extenders, moisturizers, humectants (eg, glycerin, starch, etc.), adsorbents (eg, starch, lactose, kaolin, bentonite, colloidal silicic acid, etc.), disintegration Inhibitors (for example, sucrose, stearin, cocoa butter, hydrogenated oil, etc.), coating agents, coloring agents, preservatives, fragrances, flavoring agents, sweetening agents, buffering agents, isotonic agents, soothing agents, solubilizing agents Etc. can also be included.
- a flavoring agent for example, a solubil
- surfactant examples include lignosulfonic acid, naphthalene sulfonic acid, phenol sulfonic acid, alkali metal salt, alkaline earth metal salt and ammonium salt of dibutyl naphthalene sulfonic acid, alkyl aryl sulfonate, alkyl sulfate, alkyl sulfonate.
- the pharmaceutical composition of the present embodiment can include one or more of the above carriers in one pharmaceutical composition.
- the dosage form of the pharmaceutical composition of the present invention is not particularly limited as long as it is a form that does not inactivate the active ingredient and can exhibit its pharmacological effect in vivo after administration. Usually, it varies depending on the administration method and / or prescription conditions.
- dosage forms suitable for oral administration include solid preparations (including tablets, pills, sublinguals, capsules, drops, troches), granules, powders, powders, liquids, and the like.
- the solid preparation can be made into a dosage form known in the art, for example, a sugar-coated tablet, a gelatin-encapsulated tablet, an enteric tablet, a film-coated tablet, a double tablet, or a multilayer tablet, if necessary. .
- Parenteral administration is subdivided into systemic administration and local administration, and local administration is further subdivided into intra-tissue administration, transepidermal administration, transmucosal administration, and rectal administration.
- the dosage form can be made suitable for.
- dosage forms suitable for systemic or intra-tissue administration include injections that are liquids.
- Suitable dosage forms for transepidermal or transmucosal administration include, for example, liquids (including coating agents, eye drops, nasal drops, and inhalants), suspensions (including emulsions and creams), and powders (points). Nasal and suction agents), pastes, gels, ointments, plasters and the like.
- Examples of dosage forms suitable for rectal administration include suppositories.
- each dosage form are not particularly limited as long as the dosage form is within the range of dosage forms known in the art for each dosage form.
- the DNA aptamer of the present invention is dissolved in a pharmaceutically acceptable solvent, and if necessary, a pharmaceutically acceptable carrier is added, and manufactured by a method commonly used in the art. Can do.
- Examples of the “pharmaceutically acceptable solvent” include water, ethanol, propylene glycol, ethoxylated isostearyl alcohol, polyoxylated isostearyl alcohol, polyoxyethylene sorbitan fatty acid esters and the like. These are preferably adjusted to be isotonic with blood as necessary.
- the pharmaceutical composition of the present invention can be administered to a living body in a pharmaceutically effective amount for treating or preventing a target disease such as cancer.
- the living body to be administered is a vertebrate, preferably a mammal, more preferably a human.
- the pharmaceutical composition of the present invention may be administered either systemically or locally. It can select suitably according to the kind of disease, onset location, or a progression degree. If the onset site is a local disease, local administration directly administered to and around the onset site by injection or the like is preferable. This is because a sufficient amount of the DNA aptamer of the present invention can be administered to a site (tissue or organ) to be treated, and other tissues are hardly affected. On the other hand, when the treatment site cannot be specified or the onset is a systemic disease, systemic administration by intravenous injection or the like is preferable, although there is no limitation. This is because the DNA aptamer of the present invention is distributed throughout the body through the bloodstream, so that it can be administered even to a lesion that cannot be detected by diagnosis.
- the pharmaceutical composition of the present invention can be administered by any appropriate method that does not deactivate the active ingredient.
- it may be parenteral (for example, injection, aerosol, application, eye drop, nose drop) or oral.
- parenteral for example, injection, aerosol, application, eye drop, nose drop
- oral Preferably, it is an injection.
- the injection site is not particularly limited. Any site may be used as long as the DNA aptamer which is an active ingredient can bind to the target substance. Examples thereof include intravenous, intraarterial, intrahepatic, intramuscular, intraarticular, intramedullary, intrathecal, intraventricular, transpulmonary, transdermal, subcutaneous, intradermal, and intraperitoneal.
- the present invention relates to a method for treating and / or preventing a disease, comprising administering the DNA aptamer of the present invention or the pharmaceutical composition described above to a subject.
- the disease targeted for prevention and / or treatment of the pharmaceutical composition of the present invention is a vWF-related disease.
- thrombosis examples include thrombosis, thrombotic thrombocytopenic purpura, intracranial embolism, cerebral embolism, carotid artery stenosis, thrombotic microangiopathy, and acute myocardial infarction.
- animal species that can be “subjects” include, for example, mammals, primates such as humans and chimpanzees, laboratory animals such as rats and mice, and livestock animals such as pigs, cows, horses, sheep, and goats. And pets such as dogs and cats, preferably humans.
- the present invention relates to a vWF detection agent comprising the DNA aptamer of the present invention.
- the vWF detection agent of the present invention is an agent for detecting vWF in vivo or in vitro using the binding ability of the DNA aptamer of the present invention to vWF.
- a DNA aptamer with a fluorescent reagent in advance and administering it, the expression intensity of vWF can be determined in vivo and its localization can be examined. This may be able to assist in the diagnosis of the vWF-related disease.
- the DNA aptamer of the present invention is useful in imaging and tissue staining.
- the present invention relates to a composition for detecting vWF comprising the DNA aptamer of the present invention. Since the composition of the composition is the same as that of the pharmaceutical composition, the description is omitted here.
- the present invention relates to a vWF detection kit containing the DNA aptamer of the present invention.
- the kit of the present invention may contain a buffer, a labeling reagent, and / or instructions in addition to the DNA aptamer of the present invention.
- the present invention relates to a method for detecting vWF.
- the method includes contacting a sample obtained from a subject with the DNA aptamer of the present invention, and detecting vWF based on the binding of the sample and the DNA aptamer. This method may be able to assist in the diagnosis of the vWF-related disease.
- Examples of the sample used in the present method include tissues and biological samples.
- tissues include lesion sites such as brain, heart, liver, pancreas, lungs, bone marrow, lymph nodes, and spleen.
- biopsy samples of these tissues can be used.
- biological samples include, for example, blood, plasma, lymph, tissue fluid, urine, and cells such as peripheral blood cells, hair matrix cells, oral cells, nasal cells, intestinal cells, vaginal cells, mucosal cells, and sputum (alveoli Cell or pneumohepatic cell etc.), preferably blood or plasma.
- the detection step of the detection method of the present invention is not particularly limited as long as it utilizes the binding between the sample and the DNA aptamer, and a known method may be used.
- a known method may be used.
- an SPR method, a turbidimetric method, a colorimetric method, or a fluorescence method can be used.
- SPR surface plasmon resonance
- the SPR method is a measurement method that utilizes this phenomenon, and can measure the adsorbate on the surface of the metal thin film that is the sensor portion with high sensitivity.
- the DNA aptamer of the present invention is immobilized on the surface of the metal thin film in advance, the sample is allowed to pass through the surface of the metal thin film, and before and after the sample passing caused by the binding between the nucleic acid molecule and the target substance.
- the target substance in the sample can be detected by detecting the difference in adsorbate on the metal surface.
- a substitution method, an indirect competition method, and the like are known, and any of them may be used.
- the turbidimetric method irradiates a solution with light and optically measures the attenuation of scattered light scattered by a substance suspended in the solution or transmitted light that has passed through the solution using a colorimeter or the like. It is a method of measuring the amount of substance in it.
- the target substance in the sample can be quantitatively detected by measuring the absorbance before and after adding the DNA aptamer of the present invention to the sample.
- the target substance can be detected by using it together with an antibody against the target substance.
- a method using an ELISA sandwich method may be used. In this method, first, the DNA aptamer of the present invention is immobilized on a solid support, and then a sample is added to bind the target substance present in the sample and the DNA aptamer. Subsequently, after washing the sample, an anti-target substance antibody is added to bind to the target substance. After washing, the target substance in the sample can be detected by detecting the anti-target substance antibody using a secondary antibody with an appropriate label.
- beads made of materials such as polystyrene, polycarbonate, polyvinyltoluene, polypropylene, polyethylene, polyvinyl chloride, nylon, polymethacrylate, latex, gelatin, agarose, cellulose, sepharose, glass, metal, ceramics or magnetic materials
- Insoluble carriers in the form of microplates, test tubes, sticks or test pieces can be used.
- the present invention relates to a method for assisting diagnosis of the presence or absence of a vWF-related disease in a subject.
- This method includes the step of administering the DNA aptamer of the present invention or the composition for detecting vWF of the present invention to a subject, and the step of detecting the DNA aptamer.
- a DNA aptamer is detected at a high concentration at a specific site in a living body, it can be determined that a disease has occurred at that site.
- a known method may be used, and for example, the above fluorescence method can be used.
- Example 1 Selection of DNA aptamer that binds to vWF using Ds predetermin DNA library> A DNA library containing the artificial base Ds was prepared according to the predetermin method described in WO2013 / 073602. The library used in the predetermin method is designed to include an artificial base Ds at a specific fixed position in a random base sequence.
- the DNA fragment total number of molecular species 300 pmol, about 2 ⁇ 10 14 molecules
- the target protein vWF A1 domain U-Protein, V003
- DNA binding to the target protein is selected and isolated using magnetic beads, and further, polyacrylamide gel electrophoresis is performed to cut out and isolate the DNA-vWF A1 domain complex, followed by PCR amplification.
- a round selection operation was performed. The conditions for each selection are shown in Table 1. After 8 rounds of selection, the sequence was analyzed to obtain a DNA aptamer sequence containing the artificial base Ds.
- Example 2 Sequencing of DNA aptamer> In order to accurately identify the position of the artificial base Ds, the following operation was performed and accurate sequencing was performed.
- a single-stranded DNA library prepared by PCR amplification of DNA fragments obtained after 8 rounds with dDsTP and Diol1-dPxTP was added to a 100 nM / 1x binding solution (20 mM Tris-HCl, 0.5 M NaCl, 10 mM MgCl 2 and diluted to a pH of 7.6), and 20 ⁇ l of the solution and a biotinylated probe (5 ⁇ M, 1 ⁇ l) were mixed.
- annealing is performed (90 ° C for 3 minutes, slow cooling at -0.1 ° C / second, -55 ° C for 15 minutes), mixed with streptavidin magnetic beads (5 ⁇ L) substituted with 1x binding solution, and mixed at 55 ° C for 5 minutes.
- streptavidin magnetic beads 5 ⁇ L
- the biotinylated probe and the DNA fragment hybridized complementary to the probe were immobilized on the magnetic beads.
- the solution was removed using a magnetic stand, excess DNA fragments not hybridized to the probe were removed, and the magnetic beads were washed 5 times with 150 ⁇ L of 1 ⁇ binding solution (55 ° C.). Thereafter, 20 ⁇ L of sterilized water was added to the magnetic beads after washing, and the solution was recovered immediately after heating at 75 ° C. for 5 minutes, thereby recovering the DNA fragment hybridized to the probe.
- DNA sequencing was performed by the following two methods ((i) and (ii)) using the DNA fragment recovered using the probe as a template.
- the DNA sequencing reaction was performed in a total volume of 20 ⁇ L using a commercially available BigDye® Terminator® v1.1® Cycle Sequencing Kit (Thermo Fisher® Scientific). Double-stranded DNA fragments (about 0.15 pmol) obtained by PCR amplification and purification using 5′- ACGACCGTTCTCTAATTTTGACGTT-3 ′ (SEQ ID NO: 23) and 5′-ACCAAATTATTGCGATACAGACCCT-3 ′ (SEQ ID NO: 24) as sequence primers , DdPa′TP or dPa′TP, or ddDsTP or dDsTP (500 pmol) were added to the reaction solution, and 25 cycles of PCR (96 ° C.
- the artificial base template showed a pattern (gap) indicating artificial bases at three locations, whereas the sequence using natural substituted DNA as the template In the reaction sample, the peak of A is shown. Therefore, in addition to the two Ds positions (random regions 6th and 15th) indicated by the tag sequence, the 19th artificial base Ds is also present. I found out that
- Example 3 Analysis of binding activity of DNA aptamer by gel shift assay>
- 40-mer and 38-mer DNA aptamers with the primer region truncated were prepared.
- the names and sequences of the prepared DNA aptamers are shown in Table 2, and the secondary structure predicted from the base sequence obtained by the selection is shown in FIG.
- vWF1-DsDsDs (SEQ ID NO: 1), vWF1-DsDsA (SEQ ID NO: 2) in which Ds on the 3 ′ end side are replaced with A, vWF1-DsADs (SEQ ID NO: 3) in which Ds in the middle part is replaced with A, VWF1-ADsDs (SEQ ID NO: 4) in which Ds on the 5 ′ end side is replaced with A, vWF1-DsAA (SEQ ID NO: 5) in which Ds on the middle part and 3 ′ end side are replaced with A, 5 ′ end side and 3 ′ VWF1-ADsA (SEQ ID NO: 6) with Ds on the terminal side replaced with A, vWF1-AADs (SEQ ID NO: 7) with Ds on the 5 ′ terminal side and the middle part replaced with A, vWF1 with all Ds replaced with A -AAA (SEQ ID NO: 8), Ds on the 3 v
- each DNA aptamer (100 nM) and vWF A1 domain (100 nM, U-Protein, V003) are suspended in 20 ⁇ L of a reaction solution (1 ⁇ PBS, 0.005% Nonidet P-40). And incubated at 37 ° C. for 30 minutes. After that, 25% glycerol containing bromophenol blue was added to a final concentration of 5% glycerol, and 8% non-denaturing polyacrylamide gel electrophoresis was performed at 4 ° C. Each DNA aptamer bound to the vWF A1 domain and the free state Each DNA aptamer was separated.
- the DNA aptamer was stained with SYBR® Gold (Thermo® Fisher® Scientific) diluted 1/20000 in 1 ⁇ TBE solution, and detected by Bio Image Analyzer LAS-4000 (Fuji Film).
- the gel shift rate was calculated as a percentage of the value obtained by dividing the amount of complex estimated from the band by the amount of free and complex.
- Example 4 Analysis by Biacore of binding of DNA aptamer to vWF>
- the binding ability of the obtained DNA aptamer was measured by surface plasmon resonance (SPR) using Biacore T200 manufactured by GE Healthcare.
- SPR surface plasmon resonance
- the sequences of various DNA aptamers used for the analysis are shown in Table 2 above, and the predicted secondary structure is shown in FIG. Based on vWF1-DsDsDs (SEQ ID NO: 1), vWF1-AAA (SEQ ID NO: 8) in which three Ds are replaced with A, and vWF1-DsDsDs-GC (sequence in which a part of the AT pair in the stem region is replaced with a GC pair No.
- vWF1-DsDsDs-mhGC (SEQ ID NO: 12) in which a mini hairpin was added to the 3 ′ end of vWF1-DsDsDs-GC was prepared.
- ARC1172 (SEQ ID NO: 10) was used as a positive control.
- Each of these DNA aptamers was prepared by chemical synthesis as a biotin-labeled nucleic acid having the base sequence shown in the figure and purified on a denaturing acrylamide gel.
- Each nucleic acid fragment was prepared by mixing with a phosphate buffer (pH 7.4), heating at 95 ° C., and then gradually cooling to 25 ° C. to fold (reconstruct). Then, using a SA chip coated with streptavidin (GE Healthcare) as an SPR sensor chip, the DNA aptamer was irreversibly immobilized on the chip, and then analyzed for binding to the vWF-A1 domain.
- the SPR measurement conditions were a running buffer (phosphate buffer containing 155 mM NaCl, 0.05% Nonidet P-40) and a set temperature of 37 ° C.
- Each DNA aptamer was immobilized on the sensor chip by folding the DNA solution diluted with PBS solution to 25 nM (95 ° C, heat-denatured for 3 minutes, and gradually cooled to 25 ° C), and then the final concentration of 0.05 % Nonidet P-40 was added.
- the DNA solution was immobilized on the SA chip by injecting 40 ⁇ L (equivalent to 8 minutes) at a flow rate of 5 ⁇ L / min.
- the DNA aptamer non-specifically adsorbed on the SA chip was washed by injecting 50 ⁇ mM NaOH solution at a flow rate of 20 ⁇ L / min (5 ⁇ m, 5 times).
- Interaction detection between immobilized DNA aptamer and vWF A1 domain was performed using 0 nM, 0.3125 nM, 0.625 nM, 1.25 nM, 2.5 nM, 5 nM, 10 nM and 20 nM vWF A1 domain solution (diluted with running buffer). ) was monitored by injection through Kinetic-Injection mode.
- the measurement conditions are a flow rate of 100 ⁇ L / min and a protein injection time of 150 seconds.
- Chip regeneration binding protein dissociation and DNA refolding was performed by injecting 50 ⁇ mM NaOH solution with 5 ⁇ L (corresponding to 15 seconds) and then running running buffer for 10 minutes.
- the sensorgram of each DNA aptamer is obtained from the sensorgram of each DNA aptamer using the cell to which the DNA is not immobilized as a reference cell in order to subtract the response value due to the bulk effect and nonspecific adsorption to the sensor chip. deducted.
- Tm value analysis of DNA aptamer The thermal stability (Tm value) of various DNA aptamers (vWF1-DsDsDs, vWF1-DsDsDs-GC, vWF1-DsDsDs-GCmh, vWF1-AAA final concentration: 2 ⁇ M) was measured. The change in absorbance of the DNA aptamer was measured with a UV-visible spectrophotometer UV-2450 (Shimadzu), and the Tm value, which is the melting temperature, was calculated from the first derivative. The results are shown in FIG.
- vWF1-DsDsDs-GC and vWF1-DsDsDs-mhGC had a Tm value of 10 ° C. or more higher than that of ARC1172, which is an existing DNA aptamer, and was significantly superior in thermal stability to ARC1172.
- Example 6 Selection of DNA aptamer that binds to vWF using random DNA library>
- a DNA library containing the artificial base Ds was prepared.
- the library used in the random library method is designed to include an artificial base Ds at a predetermined probability at a random position in a random base sequence.
- the selection method was performed according to the method of Example 1. Briefly, DNA fragments (total number of molecular species 300 pmol, ie about 2 ⁇ 10 14 molecules) were used as the first round library, and the target protein vWF A1 domain (U-Protein, V003) was mixed.
- DNA that binds to the target protein is selected and isolated using magnetic beads, and further PCR-amplified after selection and isolation by excising the DNA-vWF A1 domain complex by polyacrylamide gel electrophoresis, totaling 7 rounds The selection operation was performed. The conditions for each selection round are shown in Table 3. After 7 rounds of selection, the sequence was analyzed to obtain a DNA aptamer sequence containing the artificial base Ds.
- sequence analysis of the DNA library obtained after 7 rounds 151,495 sequences were obtained as total sequences to be analyzed.
- a sequence group of 100 clones or more was extracted, and clones having similar sequences were aggregated.
- the highest sequence was a single sequence, accounting for 44% or more of the entire sequence. Accounted for%.
- sequence group including the uppermost sequence three sites with a high appearance rate of only A or T were observed.
- Example 7 Sequencing of DNA aptamer> In order to accurately identify the position of the artificial base Ds, the following operation was performed and accurate sequencing was performed.
- the probe sequence of a DNA fragment consisting of 25 bases designed to be specific to the top sequence obtained in Example 6: 5′-CGTTGAGACCTGTTAGGTGCTCTTC-3 ′ (SEQ ID NO: 25) was used. This probe was obtained by biochemically labeling the 5 ′ end and purchased from Thermo Fisher Fisher Scientific, which had been chemically synthesized and simply purified. The isolation of the target sequence from the library using the probe was performed in the same manner as in Example 2.
- the sequencing analysis of DNA containing the artificial base Ds was performed in the same manner as in Example 2.
- the artificial base template showed a pattern (gap) indicating artificial bases at three locations, whereas the sequence using natural substituted DNA as the template In the reaction sample, the peak of A is shown, and from this, it was found that the artificial base Ds is present in three places (random region 9th, 21st, 32nd).
- Example 8 Analysis of binding activity of DNA aptamer by gel shift assay>
- a DNA aptamer with the primer region truncated was prepared, and binding analysis was performed by gel shift assay.
- the sequence of the DNA aptamer used in this example is shown in Table 4, and the expected secondary structure is shown in FIG.
- vWF2-DsDsDs (SEQ ID NO: 13), vWF2-DsADs (SEQ ID NO: 14) with Ds in the middle part replaced with A, vWF2-DsAA (SEQ ID NO: with the Ds on the middle part and 3 'end side replaced with A) 15), vWF2-AADs (SEQ ID NO: 16) in which the Ds on the 5 ′ end side and the middle part are replaced with A (SEQ ID NO: 16), vWF2-AAA (SEQ ID NO: 17) in which all Ds are replaced with A, and AT base pairs in the stem part VWF2-DsDsDs-mhGC (SEQ ID NO: 18) was prepared by substituting GC base pairs and adding a mini hairpin DNA to the 3 ′ end.
- the vWF2-DsDsDsDsDsDsDsDsDsDsDsDsDsDsDs was obtained by substituting the loop part of the middle part of WF2-DsDsDsDs-mhGC with the loop part sequence of mini hairpin DNA -2mhGC (SEQ ID NO: 21) was prepared.
- An existing DNA aptamer ARC1172 (SEQ ID NO: 10) was also prepared. Each DNA aptamer was prepared according to a conventional method by chemical synthesis.
- ARC1172 Compared with ARC1172 (j) used as a positive control, ARC1172 showed almost no binding by electrophoresis at 25 ° C to 37 ° C, whereas vWF2-DsDsDs containing artificial base Ds (m) , VWF2-DsADs (n), vWF2-DsDsDs-mhGC (r), and vWF2-DsDsDs-2mhGC (s) maintained binding even during electrophoresis at 25 ° C to 37 ° C.
- Example 9 Analysis by Biacore of binding of DNA aptamer to vWF> The binding ability of the obtained DNA aptamer was measured by surface plasmon resonance (SPR) using Biacore T200 of GE Healthcare.
- SPR surface plasmon resonance
- the DNA aptamer sequence used for the analysis is shown in Table 4 above, and the secondary structure predicted from the base sequence and the like obtained by selection is shown in FIG.
- Each of these DNA aptamer mutants was prepared by chemically synthesizing a nucleic acid having the base sequence shown in the figure, and then purified on a denaturing acrylamide gel.
- Each nucleic acid fragment was prepared by mixing with a phosphate buffer (pH 7.4), heating at 95 ° C., and then gradually cooling to 25 ° C. to fold (reconstruct).
- SPR binding analysis was carried out in the same manner as in Examples except that the detection of the interaction between the DNA aptamer and the vWF A1 domain was performed at 0 nM, 0.078125 nM, 0.15625 nM, 0.3125 nM, 0.625 nM, 1.25 nM, 2.5 nM, and 5 nM. Same as 4.
- Example 10 Stability analysis of DNA aptamer in human serum> The stability of each DNA aptamer to nucleolytic enzymes contained in human serum was examined. Each DNA aptamer (vWF2-DsDsDs, vWF2-DsDsDs-mhGC, vWF2-DsDsDs-2mhGC, vWF2-AAA, ARC1172, final concentration 2 ⁇ M) was mixed so that the human serum concentration was 96%, and this solution was added to 37%. Incubated at 0 ° C.
- Table 5 shows the remaining ratio (%) of each DNA aptamer at each time estimated from the intensity of the undegraded band when the time of 0 h is 100%.
- vWF2-DsDsDs-mhGC and vWF2-DsDsDs-2mhGC the amount of remaining full-length DNA aptamer was significantly higher than that in vWF-DsDsDs, which showed improved stability against nucleolytic enzymes contained in serum. Suggests that. ARC1172 used as a positive control had a residual ratio of 20% after incubation at 37 ° C. for 72 hours, whereas vWF2-DsDsDs-2mhGC remained 75% even after 72 hours. From the above, it is shown that the DNA aptamer of the present invention has higher stability against nucleolytic enzymes than ARC1172, and the addition of a mini-hairpin sequence can greatly improve the stability against nucleolytic enzymes in serum. It was done.
- Example 11 Thermal stability analysis of DNA aptamer> Thermal stability (Tm value) of each DNA aptamer (vWF2-DsDsDs, vWF2-DsADs, vWF2-DsAA, vWF2-AADs, vWF2-AAA, vWF2-DsDsDs-mhGC, vWF2-DsDsDs-2mhGC, final concentration 2 ⁇ M) It was measured. The change in absorbance of the DNA aptamer was measured with a UV-visible spectrophotometer UV-2450 (Shimadzu), and the Tm value, which is the melting temperature, was calculated from the first derivative.
- vWF2-DsDsDs-mhGC Tm 75.5 ° C
- replacing the AT base pair in the stem sequence with a GC base pair and adding a mini hairpin DNA to the 3 ′ end increases the Tm value by about 9 ° C.
- Replacement with the sequence increased the Tm value by about 10 ° C.
- a DNA aptamer having a stable structure even at a higher temperature could be produced.
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Abstract
Description
(1)以下の(i)又は(ii)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー:
(i)配列番号13~16、19及び20のいずれかに示される塩基配列、又は
(ii)(i)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。
(2)(i)の塩基配列が、配列番号13、14、19又は20に示される配列である、(1)に記載のDNAアプタマー。
(3)1~5個のGC対を塩基配列の末端に含む、(1)又は(2)に記載のDNAアプタマー。
(4)塩基配列の3'末端にミニヘアピン構造をさらに含み、
前記ミニヘアピン構造が、
5'末端側から3'末端側に向かって順番に連結された以下の(A)~(C)の核酸領域:
(A)2~5個の任意のヌクレオチドからなる第1核酸領域、
(B)GNA又はGNNA(ここで、各Nは、独立に、G、T、A若しくはCのいずれかである)の塩基配列からなる第2核酸領域、及び
(C)第1核酸領域に相補的な塩基配列からなる第3核酸領域
からなり、
かつ、第1核酸領域及び第3核酸領域が互いに塩基対合したステム部分と第2核酸領域からなるループ部分によって構成される、
(1)~(3)のいずれかに記載のDNAアプタマー。
(5)以下の(i)又は(ii)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー:
(i)配列番号18若しくは21に示される塩基配列、又は
(ii)(i)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。
(6)(1)~(5)のいずれかに記載の塩基配列からなる、vWFタンパク質に結合するDNAアプタマー。
(7)以下の(I)又は(II)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー:
(I)配列番号1~4、9及び11のいずれかに示される塩基配列、又は
(II)(I)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。
(8)(I)の塩基配列が、配列番号1又は11に示される配列である、(7)に記載のDNAアプタマー。
(9)1~5個のGC対を塩基配列の末端に含む、(7)又は(8)に記載のDNAアプタマー。
(10)塩基配列の3'末端にミニヘアピン構造をさらに含み、
前記ミニヘアピン構造が、
5'末端側から3'末端側に向かって順番に連結された以下の(A)~(C)の核酸領域:
(A)2~5個の任意のヌクレオチドからなる第1核酸領域、
(B)GNA又はGNNA(ここで、各Nは、独立に、G、T、A若しくはCのいずれかである)の塩基配列からなる第2核酸領域、及び
(C)第1核酸領域に相補的な塩基配列からなる第3核酸領域
からなり、
かつ、第1核酸領域及び第3核酸領域が互いに塩基対合したステム部分と第2核酸領域からなるループ部分によって構成される、
(7)~(9)のいずれかに記載のDNAアプタマー。
(11)以下の(I)又は(II)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー:
(I)配列番号12に示される塩基配列、又は
(II)(I)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。
(12)(7)~(11)のいずれかに記載の塩基配列からなる、vWFタンパク質に結合するDNAアプタマー。
(13)(1)~(12)のいずれかに記載のDNAアプタマーを含むvWFタンパク質検出剤。
(14)(1)~(12)のいずれかに記載のDNAアプタマーを含むvWFタンパク質検出用キット。
(15)(1)~(12)のいずれかに記載のDNAアプタマーを含む医薬組成物。
(16)血栓症、血栓性血小板減少性紫斑病、頭蓋内塞栓、脳塞栓症、頸動脈狭窄、血栓性微小血管症、及び急性心筋梗塞症からなる群から選択される疾患の治療及び/又は予防のための、(15)に記載の医薬組成物。
(17)被験体から得られたサンプルを、(1)~(12)のいずれかに記載のDNAアプタマーと接触させる工程、及び
前記サンプルと前記DNAアプタマーの結合に基づいてvWFタンパク質を検出する工程、
を含む、vWFタンパク質を検出する方法。
本明細書で使用する一般的な用語の定義について以下で説明する。
一態様において、本発明は、以下の(i)又は(ii)の塩基配列を含む、vWFに結合するDNAアプタマーに関する:
(i)配列番号13~16、19及び20のいずれか、好ましくは配列番号13、14、19及び20のいずれかに示される塩基配列、又は
(ii)(i)に示される塩基配列において、Ds以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。
(I)配列番号1~4、9及び11のいずれか、好ましくは配列番号1又は11に示される塩基配列、又は
(II)(I)に示される塩基配列において、Ds以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。
一態様において、本発明は、本発明のDNAアプタマーを含む医薬組成物に関する。本発明の医薬組成物は、本発明のDNAアプタマーが有するvWFへの結合能を失わない範囲において、他の薬剤を一以上含有することもできる。
一態様において、本発明は本発明のDNAアプタマー又は上記医薬組成物を被験体に投与することを含む、疾患の治療及び/又は予防方法に関する。
一態様において、本発明は、本発明のDNAアプタマーを含むvWF検出剤に関する。本発明のvWF検出剤は、本発明のDNAアプタマーのvWFへの結合能を利用して、in vivo又はin vitroにおいてvWFを検出するための薬剤である。例えば、DNAアプタマーをあらかじめ蛍光試薬等で標識し、これを投与することによって、生体内でvWFの発現強度を決定し、またその局在を調べることができる。これによって、上記vWF関連疾患の診断を補助することが可能となり得る。本発明のDNAアプタマーは、イメージング及び組織染色等において有用である。
一態様において、本発明は、vWFを検出する方法に関する。本方法は、被験体から得られたサンプルを、本発明のDNAアプタマーと接触させる工程、及びサンプルとDNAアプタマーの結合に基づいてvWFを検出する工程を含む。本方法によって、上記vWF関連疾患の診断を補助することが可能となり得る。
WO2013/073602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。プレデターミン法で用いるライブラリーは、ランダムな塩基配列中の特定の固定された位置に人工塩基Dsを含むようにデザインされたものである。手短には、DNA断片(分子種総数は300 pmol、約2×1014分子)を1ラウンド目のライブラリーとして用い、標的タンパク質であるvWF A1ドメイン(U-Protein社、V003)を混合した後、磁気ビーズを用いて標的タンパク質に結合するDNAを選別及び単離し、さらにポリアクリルアミドゲル電気泳動を行いDNA-vWF A1ドメイン複合体を切り出すことにより選別及び単離後、PCR増幅を行い、計8ラウンドのセレクション操作を行った。各セレクションの条件は表1に示した。8ラウンドのセレクション終了後、配列の解析を行い、人工塩基Dsを含むDNAアプタマーの配列を得た。
人工塩基Dsの位置を正確に同定するため、以下の操作を行い、正確な配列決定を行った。
配列同定した人工塩基Dsを3箇所に含むDNAアプタマーのvWF A1ドメインタンパクに対する結合を調べるために、プライマー領域を切り詰めた40-mer及び38-merのDNAアプタマーを調製した。調製した各DNAアプタマーの名称及び配列を表2に、セレクションで得られた塩基配列等から予測される二次構造を図1に示す。
得られたDNAアプタマーの結合能を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。解析に用いた各種DNAアプタマーの配列を上記表2に、予測される二次構造を図3に示す。vWF1-DsDsDs(配列番号1)を元に、三つのDsをAに置換したvWF1-AAA(配列番号8)、ステム領域のAT対の一部をGC対に置換したvWF1-DsDsDs-GC(配列番号11)、vWF1-DsDsDs-GC の3'末端にミニヘアピンを付加したvWF1-DsDsDs-mhGC(配列番号12)を調製した。また、陽性対照として、ARC1172(配列番号10)を用いた。
各種DNAアプタマー(vWF1-DsDsDs、vWF1-DsDsDs-GC、vWF1-DsDsDs-GCmh、vWF1-AAA最終濃度:2 μM)の熱安定性(Tm値)を測定した。DNAアプタマーの吸光度変化を、紫外可視分光光度計 UV-2450(島津)により測定し、その一次微分から融解温度であるTm値を算出した。結果を図5に示す。vWF1-DsDsDsはTm = 65.7℃、vWF1-DsDsDs-GCはTm = 73.0℃、vWF1-DsDsDs-mhGCはTm = 74.7℃と、ステム部分のGC対の増加及びミニヘアピンDNAの付加により熱安定性が向上していることが示された。特に、vWF1-DsDsDs-GC及びvWF1-DsDsDs-mhGCは、既存のDNAアプタマーであるARC1172と比較してもTm値が10℃以上高く、熱安定性がARC1172より顕著に優れていた。一方で、DsをAに置換したvWF1-AAAはTm = 63.0℃と僅かに低下しており、Ds自体が熱安定性に関与していることが示された。
WO2013/073602に記載のランダムライブラリー法に従って、人工塩基Dsを含むDNAライブラリーの調製を行った。ランダムライブラリー法で用いるライブラリーは、ランダムな塩基配列中のランダムな位置に所定の確率で人工塩基Dsを含むようにデザインされたものである。セレクション方法は実施例1の方法に従って行った。手短には、DNA断片(分子種総数は300 pmol、すなわち約2×1014分子)を1ラウンド目のライブラリーとして用い、標的タンパク質であるvWF A1ドメイン(U-Protein社、V003)を混合した後、磁気ビーズを用いて標的タンパク質に結合するDNAを選別及び単離し、さらにポリアクリルアミドゲル電気泳動によってDNA-vWF A1ドメイン複合体を切り出すことにより選別及び単離後、PCR増幅し、計7ラウンドのセレクション操作を行った。各セレクションラウンドの条件は表3に示した。7ラウンドのセレクション終了後、配列の解析を行い、人工塩基Dsを含むDNAアプタマー配列を得た。
人工塩基Dsの位置を正確に同定するため、以下の操作を行い、正確な配列決定を行った。
配列同定した人工塩基Dsを3箇所に含むDNAアプタマーのvWF A1ドメインタンパクに対する結合を調べるために、プライマー領域を切り詰めたDNAアプタマーを作製し、ゲルシフトアッセイによって結合解析を行った。本実施例に使用したDNAアプタマーの配列を表4に、予想される二次構造を図6に示した。
得られたDNAアプタマーの結合能をGEヘルスケア社のBiacoreT200を用いた表面プラズモン共鳴(SPR)により測定した。解析に用いたDNAアプタマーの配列は、上記表4に示し、セレクションで得られた塩基配列等から予測される二次構造を図6に示した。
各DNAアプタマーのヒト血清中に含まれる核酸分解酵素に対する安定性を調べた。各DNAアプタマー(vWF2-DsDsDs、vWF2-DsDsDs-mhGC、vWF2-DsDsDs-2mhGC、vWF2-AAA、ARC1172、最終濃度2 μM)を、ヒト血清濃度が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、1時間後、6時間後、24時間後、48時間後、及び72時間後に混合溶液から10 μLを分取し、110μLの1×TBE、10M Urea溶液と混合して分解反応を止めた。反応後のサンプルを変性15%ポリアクリルアミドゲル電気泳動で分離した後、ゲルをSYBR GOLD(Thermo Fisher Scientific)で染色して1本鎖核酸を検出した。ヒト血清中の核酸分解酵素による分解産物のバンドパターンをバイオイメージャーLAS-4000(富士フィルム)で解析した。
各DNAアプタマー(vWF2-DsDsDs、vWF2-DsADs、vWF2-DsAA、vWF2-AADs、vWF2-AAA、vWF2-DsDsDs-mhGC、vWF2-DsDsDs-2mhGC、最終濃度2 μM)の熱安定性(Tm値)を測定した。DNAアプタマーの吸光度変化を、紫外可視分光光度計 UV-2450(島津)により測定し、その一次微分から融解温度であるTm値を算出した。
Claims (17)
- 以下の(i)又は(ii)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー: (i)配列番号13~16、19及び20のいずれかに示される塩基配列、又は
(ii)(i)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。 - (i)の塩基配列が、配列番号13、14、19又は20に示される配列である、請求項1に記載のDNAアプタマー。
- 1~5個のGC対を塩基配列の末端に含む、請求項1又は2に記載のDNAアプタマー。
- 塩基配列の3'末端にミニヘアピン構造をさらに含み、
前記ミニヘアピン構造が、
5'末端側から3'末端側に向かって順番に連結された以下の(A)~(C)の核酸領域:
(A)2~5個の任意のヌクレオチドからなる第1核酸領域、
(B)GNA又はGNNA(ここで、各Nは、独立に、G、T、A若しくはCのいずれかである)の塩基配列からなる第2核酸領域、及び
(C)第1核酸領域に相補的な塩基配列からなる第3核酸領域
からなり、
かつ、第1核酸領域及び第3核酸領域が互いに塩基対合したステム部分と第2核酸領域からなるループ部分によって構成される、
請求項1~3のいずれか一項に記載のDNAアプタマー。 - 以下の(i)又は(ii)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー: (i)配列番号18若しくは21に示される塩基配列、又は
(ii)(i)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。 - 請求項1~5のいずれか一項に記載の塩基配列からなる、vWFタンパク質に結合するDNAアプタマー。
- 以下の(I)又は(II)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー: (I)配列番号1~4、9及び11のいずれかに示される塩基配列、又は
(II)(I)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。 - (I)の塩基配列が、配列番号1又は11に示される配列である、請求項7に記載のDNAアプタマー。
- 1~5個のGC対を塩基配列の末端に含む、請求項7又は8に記載のDNAアプタマー。
- 塩基配列の3'末端にミニヘアピン構造をさらに含み、
前記ミニヘアピン構造が、
5'末端側から3'末端側に向かって順番に連結された以下の(A)~(C)の核酸領域:
(A)2~5個の任意のヌクレオチドからなる第1核酸領域、
(B)GNA又はGNNA(ここで、各Nは、独立に、G、T、A若しくはCのいずれかである)の塩基配列からなる第2核酸領域、及び
(C)第1核酸領域に相補的な塩基配列からなる第3核酸領域
からなり、
かつ、第1核酸領域及び第3核酸領域が互いに塩基対合したステム部分と第2核酸領域からなるループ部分によって構成される、
請求項7~9のいずれか一項に記載のDNAアプタマー。 - 以下の(I)又は(II)の塩基配列を含む、vWFタンパク質に結合するDNAアプタマー: (I)配列番号12に示される塩基配列、又は
(II)(I)に示される塩基配列において、7-(2-thienyl)-3H-imidazo[4,5-b]pyridine-3-yl以外の位置において1又は数個のヌクレオチドが付加、欠失、及び/又は置換された塩基配列。 - 請求項7~11のいずれか一項に記載の塩基配列からなる、vWFタンパク質に結合するDNAアプタマー。
- 請求項1~12のいずれか一項に記載のDNAアプタマーを含むvWFタンパク質検出剤。
- 請求項1~12のいずれか一項に記載のDNAアプタマーを含むvWFタンパク質検出用キット。
- 請求項1~12のいずれか一項に記載のDNAアプタマーを含む医薬組成物。
- 血栓症、血栓性血小板減少性紫斑病、頭蓋内塞栓、脳塞栓症、頸動脈狭窄、血栓性微小血管症、及び急性心筋梗塞症からなる群から選択される疾患の治療及び/又は予防のための、請求項15に記載の医薬組成物。
- 被験体から得られたサンプルを、請求項1~12のいずれか一項に記載のDNAアプタマーと接触させる工程、及び
前記サンプルと前記DNAアプタマーの結合に基づいてvWFタンパク質を検出する工程、
を含む、vWFタンパク質を検出する方法。
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KR1020187013314A KR20180072722A (ko) | 2015-10-30 | 2016-10-25 | vWF에 결합하는 DNA 앱타머 |
US15/771,588 US10760083B2 (en) | 2015-10-30 | 2016-10-25 | DNA aptamer that binds to vWF |
CN201680063729.0A CN108350461B (zh) | 2015-10-30 | 2016-10-25 | 结合vWF的DNA适配体 |
KR1020237014013A KR102640903B1 (ko) | 2015-10-30 | 2016-10-25 | vWF에 결합하는 DNA 앱타머 |
JP2017547793A JP6721189B2 (ja) | 2015-10-30 | 2016-10-25 | vWFに結合するDNAアプタマー |
ES16859766T ES2903041T3 (es) | 2015-10-30 | 2016-10-25 | Aptámero de ADN capaz de unión a vWF |
AU2016346270A AU2016346270A1 (en) | 2015-10-30 | 2016-10-25 | DNA aptamer capable of bonding to vWF |
CA3003576A CA3003576A1 (en) | 2015-10-30 | 2016-10-25 | Dna aptamer that binds to vwf |
SG11201803631YA SG11201803631YA (en) | 2015-10-30 | 2016-10-25 | DNA aptamer that binds to vWF |
EP16859766.4A EP3369820B1 (en) | 2015-10-30 | 2016-10-25 | Dna aptamer capable of bonding to vwf |
HK18113106.4A HK1253955A1 (zh) | 2015-10-30 | 2018-10-12 | 結合vwf的dna適配體 |
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WO2020256639A1 (en) * | 2019-06-21 | 2020-12-24 | Agency For Science, Technology And Research | An aptamer for dengue virus and related methods and products |
US10788488B1 (en) * | 2019-11-12 | 2020-09-29 | Alfaisal University | Full-length and truncated anti-coagulant Dabigatran etexilate specific DNA aptamers for electrochemical and fluorescence sensing applications |
WO2021158583A1 (en) * | 2020-02-04 | 2021-08-12 | Band Therapeutics, Llc | Regulation of von willebrand factor (vwf) |
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