WO2006043521A1 - ホスホロチオエート結合を有する光学活性なオリゴ核酸化合物 - Google Patents
ホスホロチオエート結合を有する光学活性なオリゴ核酸化合物 Download PDFInfo
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- WO2006043521A1 WO2006043521A1 PCT/JP2005/019074 JP2005019074W WO2006043521A1 WO 2006043521 A1 WO2006043521 A1 WO 2006043521A1 JP 2005019074 W JP2005019074 W JP 2005019074W WO 2006043521 A1 WO2006043521 A1 WO 2006043521A1
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- WIPO (PCT)
- Prior art keywords
- oligonucleic acid
- acid compound
- general formula
- double
- nucleic acid
- Prior art date
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- C07H21/00—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H21/00—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids
- C07H21/02—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids with ribosyl as saccharide radical
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- 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
- C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
- C12N15/1034—Isolating an individual clone by screening libraries
- C12N15/1086—Preparation or screening of expression libraries, e.g. reporter assays
Definitions
- the present invention relates to an optically active oligonucleic acid compound having a phosphorothioate bond, which is useful as a therapeutic agent, a diagnostic agent or a research reagent, and a method for producing the same.
- an antisense method using oligo DNA is known as a method for suppressing the expression of a specific gene.
- Antisense molecules having a structure complementary to the target gene (mRNA) are theoretically capable of controlling the growth of cancer cells and the like at the gene level, and are expected to be used as new drugs. It has already been clarified that natural oligo DNA having a structure complementary to the target gene (mRNA) forms a stable duplex with the target gene (mRNA) and functions as an antisense molecule. However, it is clear that natural oligo DNA loses its function as an antisense molecule due to metabolism of its phosphate cross-links and nucleobase by various enzymes in the cell. . In order to make the antisense method an effective gene therapy method, nucleic acid molecules with features such as improved affinity for the target gene (mRNA), improved permeability to cells, and improved stability to nucleolytic enzymes. Creation is effective.
- oligo DNA having a phosphorothioate bond is the most studied compound and has been confirmed to have an antisense effect on various target genes (mRNAs).
- an oligo DNA having phosphorothioate bonds synthesized by ordinary chemical synthesis is a diastereomeric mixture of Rp and Sp, and N phosphorothioate bonds.
- Rp and Sp phosphorothioate bonds
- N phosphorothioate bonds
- This P-chiral problem is expected to greatly affect the affinity to the target gene (mRNA), stability to nucleolytic enzymes, etc., and synthesis of optically active nucleic acid compounds is desired.
- the Rp isomer enhances the binding ability to the target RNA in oligo DNA! / Sp isomers against exonuclease. It is reported that it is sufficiently stable.
- an optically active oligo DNA having a phosphorothioate bond has been synthesized (see Patent Document 1 and Non-Patent Document 1).
- the condensation step includes a step in which a phosphorothioate bond having an asymmetric center is formed, it is not always possible to obtain oligoDNA with high purity.
- an optically active oligo RNA having a phosphorothioate bond or an oligonucleic acid compound having RNA in the molecule has not yet been produced.
- RNA itself has various functions and activities. For example, it is known to suppress gene expression as seen in RNA interference.
- optically active oligo RNA having a phosphorothioate bond or an oligonucleic acid having RNA in the molecule has not yet been synthesized, so that the effects of the compound are sufficient for research. It has been done.
- Patent Document 1 International Publication No. 01 / 40515A1 Pamphlet
- Non-Patent Literature 1 Wojciech J. stec et al., Journal of American Chemical Soci ety, 120 (29), 7156 (1998)
- An object of the present invention is to provide an optically active oligonucleic acid compound having a phosphoholoate bond that can be useful mainly as a therapeutic agent, a diagnostic agent, or a research reagent, a method for producing the same, and a nucleic acid dimer as a raw material thereof There is to do.
- Optically active oligonucleic acid having a phosphorothioate bond represented by the following general formula (1) The compound can be produced by using at least one optically active nucleic acid dimer compound represented by the following general formula (2a) or (2b) as a nucleic acid synthesis unit. This will be described in detail below.
- each B independently represents ORP III as a nucleobase.
- n represents an integer in the range of 1 to 99.
- Each R 1 independently represents hydrogen, a hydroxyl group or an alkoxy group, and each represents at least one hydroxyl group.
- Each Y independently represents a substituent represented by the following general formula (la), (lb) or (lc), and each Y represents at least one substituent (la) or (1 b ). However, the case where Y of adjacent constituent monomers is any substituent (la) or (lb) is excluded.
- Z represents hydrogen or a phosphate group.
- Bx and Bx are the same or different and represent a nucleobase which may have a protecting group.
- R lal R lal
- R la2 is the same or different and represents hydrogen, alkoxy or silyloxy.
- R 2 represents acyl or a substituent represented by the following general formula (3a) or (3b).
- R 2a and R 2b are the same or different and represent a force representing alkyl, or a 5- to 6-membered saturated amino ring formed by combining R 2a and R 2b with an adjacent nitrogen atom.
- R 2d represents aryl or a 1 to 2 cyclic heterocyclic group.
- R 2 R 2e represents alkyl.
- R 3 represents alkyl, aryl, or a 1 to 2 cyclic heterocyclic group.
- R 4 represents hydrogen or a group capable of leaving under acidic conditions.
- nucleobase related to B, B, B is particularly limited as long as it is used for nucleic acid synthesis.
- adenine, guanine, cytosine, uracil, thymine, or a modified body thereof can be mentioned.
- a “modified product” of a nucleobase refers to a compound in which the nucleobase is substituted with an arbitrary substituent, and examples of the substituent related to the modified product of B, B, B include, for example, halogen, acyl, alkyl
- substituents can be selected from the group consisting of, arylalkyl, alkoxy, alkoxyalkyl, hydroxy, amino-containing monoalkylamino, dialkylamino, carboxy, cyano and -tro.
- examples of “norogen” include fluorine, chlorine, bromine and iodine.
- examples of “acyl” include linear or branched alkanoyl having 1 to 6 carbon atoms and aroyl having 7 to 13 carbon atoms. Specific examples include formyl, acetyl, n-propionyl, isopropionyl, n-butyryl, isobutyryl, tert-butyryl, valeryl, hexanol, benzoyl, naphthoyl, and levulyl. Examples of substituents that may be substituted with “acyl” include halogen, alkyl, alkoxy, nitro-containing trimethylsilyl, and trimethylsilyl. .
- acyl related to R 2 include, for example, levulinyl, acetyl, propionyl, butyryl, isobutyryl, benzoyl, 4-anisyl, phenylacetyl, phenoxyacetyl, 4 tert butylphenoxyacetyl, 4 Mention may be made of isopropylphenoxycetyl.
- the “alkyl” includes, for example, a linear or branched carbon number of 1 to 5 Can be mentioned. Specific examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl and tert-butyl. Examples of the substituent which may be substituted with the “alkyl” include halogen, alkyl, alkoxy, nitro-nitro and trimethylsilyl, and these forces are substituted by 3 to 3.
- examples of the “alkyl” related to R 2a and R 2b include methyl, ethyl, n-propyl and isopropyl, and the “alkyl” related to R 2c , R 2d and R 3 Examples include methyl, 2-cyanoethyl, 2-troethyl, and 2-trimethylsilylethyl.
- alkyl moiety of “arylalkyl”, “alkoxyalkyl”, “monoalkylamino” and “dialkylamino” are the same as the above “alkyl”.
- examples of “aryl” include those having 6 to 12 carbon atoms. Specifically, for example, phenyl, 1-naphthyl, 2-naphthyl and biphenyl can be mentioned.
- substituent which may be substituted with the “aryl” include halogen, alkyl, alkoxy, and nitro-containing nitro, and 1 to 3 of these are substituted.
- examples of the “aryl” related to R 2d and R 3 include 2-chlorophenol and 2-tert-butylphenol.
- aryl part of “aryl alkyl” may be the same as the above “aryl”.
- examples of the “alkoxy” include linear or branched ones having 1 to 4 carbon atoms. Specifically, for example, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy and tert-butoxy can be mentioned.
- substituent which may be substituted with the “alkoxy” include alkyl and alkoxy, and 1 to 3 of these may be substituted.
- examples of the “alkoxy” related to R ⁇ Rlal and Rla2 include methoxy, ethoxy and methoxyethoxy.
- alkoxy part of “alkoxyalkyl” may be the same as the above “alkoxy”.
- “norogen”, “alkyl” and “alkoxy” which are the substituents of “acyl”, “alkyl”, and “aryl” are the same as those described above.
- nucleobase is a protected nucleic acid having an amino group
- R lal as according to the R la2 "Shiriruokishi", for example, it can be mentioned trimethylsilyl, Toryechirushiriru, tert- butyldimethylsilyl, triisopropoxide building silyl, a tert- Buchirujifu two Rushiri Honoré.
- the "1 to 2 cyclic heterocyclic group" relating to R 2d and R 3 includes, for example, 1 to 3 selected heteroatoms such as a nitrogen atom, an oxygen atom, and sulfur nuclear power. Examples thereof include a 5- to 12-membered monocyclic ring or condensed ring which may have 1 to 6 unsaturated bonds or may be substituted. Examples of the strong substituent include 1 to 3 identical or different substituents selected from the group force consisting of alkyl, alkoxy, halogen, and nitro. Of these, 1-benzotriazole and 1-morpholino are preferable.
- Examples of the “group capable of leaving under acidic conditions” related to R 4 include trityl, 4, 4′-dimethoxytrityl, 9 phenylxanthen-9yl, 2-tetrahydrobiranyl, 1-methoxy — 4-Tetrahydroviral can be mentioned.
- Examples of the “5- to 6-membered saturated amino ring group” relating to R 2a and R 2b include pyrrolidine-1-yl, piperidine-1-yl, and morpholine-1-yl. .
- the asymmetric center on the phosphorous atom at the phosphorothioate binding site present in the oligonucleic acid conjugate produced in the present invention is all by the optically active nucleic acid dimer compound (2a) or (2b). be introduced.
- the nucleic acid dimer compound (2a) or (2b) used in the method for producing an oligonucleic acid compound according to the present invention is produced by a so-called solid phase method or a so-called liquid phase method. It depends on whether it is manufactured.
- FIG. 1 shows a chromatogram obtained by reverse-phase HPLC analysis of (Rp) —AsA (l).
- the vertical axis represents time (minutes) and the horizontal axis represents absorption intensity.
- FIG. 2 shows a chromatogram obtained by reverse phase HPLC analysis of (Sp) —AsA (2).
- the vertical axis represents time (minutes) and the horizontal axis represents absorption intensity.
- FIG. 3 shows a chromatogram obtained by reverse-phase HPLC analysis of a mixture of (Rp) —AsA (l) and (Sp) —AsA (2).
- the vertical axis represents time (minutes) and the horizontal axis represents absorption intensity.
- FIG. 4 shows a chromatogram obtained by ion exchange HPLC analysis of the oligonucleic acid compound (3) synthesized in Example 8.
- the vertical axis represents time (minutes) and the horizontal axis represents absorption intensity.
- FIG. 5 shows a chromatogram obtained by ion exchange HPLC analysis of the oligonucleic acid compound (4) synthesized in Example 9.
- the vertical axis represents time (minutes) and the horizontal axis represents absorption intensity.
- a method of producing an oligonucleic acid compound having a phosphorothioate bond by a solid-phase method is, for example, by performing steps 1 to 7 shown below to step by step from 3 ′ to 5 ′ in the direction of nucleic acid.
- steps 1 to 7 shown below By synthesizing the synthesis units, an oligonucleic acid compound having a phosphorothioate bond having a nucleic acid polymerization degree of 2 to LOO can be produced.
- the production method can be carried out by any method using a manual or an automatic synthesizer, but a method using an automatic synthesizer is preferable from the viewpoint of simplification of the operation method and the accuracy of synthesis.
- those other than the nucleic acid synthesis unit are used for oligo DNA synthesis. If it is generally used, it will not be specifically limited.
- Step 1 A step of removing the protecting group for the hydroxyl group at the 5 ′ position by allowing an acid to act on the nucleic acid complex supported on the solid phase carrier.
- nucleic acid compound represented by the following general formula (6), (6a), (6b) supported on a solid phase carrier, or the operations of steps A to D described later are performed.
- This can be carried out by allowing an acid to act on oligo RNA or oligo DNA (hereinafter referred to as “nucleic acid compound supported on a solid phase carrier”) carried on a solid phase carrier produced by the above method.
- solid phase carrier examples include controlled pore glass (CPG), oxalylated-constant glass (for example, Alul et al., Nucleic Acids Research, 1991, 19,] 527), TentaGel support-aminoaminoglycol glycol derivative support (see, eg, Wright et al., Tetrahedron Letters, 1993, 34, 3373), Poros—polystyrene Z dibulebenzene copolymer. Can do.
- CPG controlled pore glass
- oxalylated-constant glass for example, Alul et al., Nucleic Acids Research, 1991, 19,] 527
- TentaGel support-aminoaminoglycol glycol derivative support see, eg, Wright et al., Tetrahedron Letters, 1993, 34, 3373
- linker examples include 3-aminopropyl, succiol, 2,2′-diethanol sulfol, and long one-chain alkylamino (LCAA).
- R 2 L include substituents represented by the following general formulas (9a) and (9b).
- R 2E has the same meaning as described above.
- the compound (6a) or (6b) in which R 2 L is a substituent (9a) or (9b) can be obtained by, for example, nucleic acid dimer compound (2a) or (2b) force known methods (for example, Steven P. Adams et al. , Journa 1 of American Chemical Society, 105, 661 (1983), T. Horn et al., Tetrah edron Letters, 27, 4705 (1986), A. Guzaev et al., US Pat. No. 5,959,090) it can.
- Step 2 A step of condensing a nucleic acid synthesis unit using an active agent with the nucleic acid compound produced in Step 1 and supported on a solid phase carrier.
- This step can be carried out by allowing the nucleic acid synthesis unit and the activator to act on the nucleic acid complex supported on the solid phase carrier.
- nucleic acid monomer unit examples include compounds represented by the following general formula (10a) which can be produced or obtained as commercially available products according to known methods.
- R 2pa represents a substituent represented by the general formula (3a).
- nucleic acid dimer unit examples include an optically active nucleic acid dimer compound represented by the following general formula (2a) or (2b).
- oligonucleic acid unit examples include an oligonucleic acid compound represented by the following general formula (11a).
- Examples of the "activator” include 1H-tetrazole, 5- (4-trifluoro) 1H-tetrazole, and diisopropylaminotetrazolide.
- the reaction temperature in the above reaction is suitably 20 ° C to 50 ° C.
- the reaction time varies depending on the type of activator used and the reaction temperature, but usually 1 minute to 1 hour is appropriate.
- the amount of the reagent to be used is 1 to 10 times the molar amount of the nucleic acid compound supported on the solid phase carrier, and preferably 1 to 10 times the molar amount!
- Step 3 5 of the nucleic acid compound supported on the solid phase carrier that was unreacted in Step 2
- This step is a reaction to protect the 5′-position hydroxyl group of the nucleic acid compound supported on the solid phase carrier, which has not been reacted in Step 2, and is capped to the nucleic acid compound supported on the solid phase carrier. It can be carried out by acting an agent.
- Examples of the "capping agent” include acetic anhydride or phenoxyacetic anhydride.
- the capping agent can be used by diluting with a suitable solvent so as to have a concentration of 0.05 to 1M.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction.
- 4-dimethylaminopyridine or N-methylimidazole can be used as the “reaction accelerator”.
- the reaction temperature in the above reaction is suitably 20 ° C to 50 ° C.
- the reaction time varies depending on the type of capping agent used and the reaction temperature, but usually 1 to 30 minutes is appropriate.
- the amount of the reagent used is 1 to: the LOO-fold molar amount is appropriate with respect to the nucleic acid compound supported on the solid phase carrier, and the 1 to 10-fold molar amount is preferred! /.
- Step 4 A step of converting a phosphite group into a phosphate group by allowing an oxidizing agent to act on the nucleic acid compound produced in Step 2.
- This step is a reaction for converting trivalent phosphorus to pentavalent phosphorus using an oxidizing agent, and can be carried out by allowing the oxidizing agent to act on the nucleic acid mixture supported on the solid phase carrier. it can
- Examples of the "oxidant" include iodine and tert-butyl hydroperoxide.
- the oxidizing agent used in this step can be diluted with an appropriate solvent so as to have a concentration of 0.05 to 2M.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include pyridine, tetrahydrofuran, water, or a mixed solvent thereof.
- a peroxide for example, tert butyl hydride peroxide Z dichloromethane
- the reaction temperature is suitably 20 ° C to 50 ° C.
- the reaction time varies depending on the kind of oxidizing agent used and the reaction temperature, but usually 1 to 30 minutes is appropriate.
- the amount of the reagent to be used is suitably 1 to 100-fold mol amount, preferably 10 to 50-fold mol amount based on the nucleic acid compound supported on the solid phase carrier.
- Step 5 An oligonucleic acid compound having a desired chain length phosphorothioate bond produced by repeating Steps 1 to 4 above is excised from the solid phase carrier, and each nucleobase moiety and each 2 ' Removing the protective group for the hydroxyl group at the position.
- This step is a reaction in which an oligonucleic acid compound having a phosphorothioate bond having a desired chain length is removed from the solid phase carrier and the linker by a cleaving agent. It can be carried out by adding a cleaving agent to a solid phase carrier on which an oligonucleic acid conjugate having a thioate bond is supported. Further, in this step, the protecting group of each nucleobase can be removed.
- Examples of the "cutting agent” include concentrated aqueous ammonia and methylamine.
- the “cutting agent” used in this step can be used by diluting with water, methanol, ethanol, isopropyl alcohol, acetonitrile, tetrahydrofuran or a mixed solvent thereof, for example. Of these, ethanol is preferred.
- the reaction temperature is suitably 15 ° C to 75 ° C, preferably 15 ° C to 30 ° C, more preferably 18 ° C to 25 ° C.
- the deprotection reaction time is suitably 1 to 30 hours, preferably 1 to 24 hours, and more preferably 12 to 24 hours.
- the concentration of hydroxyammonium hydroxide in the solution used for deprotection is suitably 20-30% by weight, preferably 25-30% by weight, more preferably 28-30% by weight. .
- the amount of the reagent used is suitably 100 to 100 times the molar amount, preferably 10 to 50 times the molar amount of the nucleic acid compound supported on the solid phase carrier! /.
- the step of removing the hydroxyl-protecting group at the 2'-position is a "reagent for deprotecting the hydroxyl-protecting group at the 2'-position", for example, tetra-n-butylammofluoride, hydrogen trifluoride'triethyl.
- the reaction can be carried out by allowing an amine salt to act on an oligonucleic acid compound having a phosphorothioate bond of a desired chain length that has been cut out from a solid phase carrier.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include tetrahydrofuran, N-methylpyrrolidone, pyridine and a mixed solvent thereof.
- the reaction temperature is suitably 20 ° C to 80 ° C.
- the reaction time varies depending on the type of deprotecting agent to be used and the reaction temperature, but usually 1 hour to 100 hours is appropriate.
- the amount of reagent to be used is appropriate in the range of 50 to 500-fold molar amount with respect to the protecting group to be removed, and 50-: LOO-fold molar amount is preferred! / ⁇ .
- This process is a reaction that finally removes the protecting group of the 5′-hydroxyl group of the oligonucleic acid compound, and acts on the oligonucleic acid compound having a phosphorothioate bond cleaved by the solid phase carrier force. Can be implemented.
- Examples of the "acid” include triclonal acetic acid, dichloroacetic acid, acetic acid and the like.
- the acid used in this step can also be diluted with an appropriate solvent.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include dichloromethane, acetonitrile, water, a buffer solution having a pH of 2 to 5 or a mixed solvent thereof.
- Examples of the buffer solution include an acetate buffer solution.
- the reaction temperature is suitably 20 ° C to 50 ° C.
- the reaction time varies depending on the type of acid used and the reaction temperature, but usually 1 minute to 1 hour is appropriate.
- the amount of the reagent to be used is suitably 1 to 100 times the molar amount, preferably 1 to 10 times the molar amount of the nucleic acid compound supported on the solid phase carrier!
- Step 7 A step of separating and purifying the oligonucleic acid compound produced in Step 6.
- the “separation and purification step” refers to usual separation and purification means from the above reaction mixture, such as extraction, concentration, neutralization, filtration, centrifugation, recrystallization, C-force C reverse phase column chromatography, C
- oligonucleic acid compounds having the desired phosphorothioate bond can be obtained. It is a process of isolation and purification.
- Examples of the "elution solvent” include acetonitrile, methanol, ethanol, isopropyl alcohol, water alone, or a mixed solvent in any ratio.
- examples of additives include sodium phosphate, potassium phosphate, sodium chloride salt, potassium salt salt, ammonium acetate, triethylammonium acetate, sodium acetate, acetic acid lithium, Tris-HCl, Ethylenediamine tetraacetic acid can be added at a concentration of lmM to 2M, and the pH of the solution can be adjusted in the range of 1 to 9.
- the phosphorothioate having a desired chain length is obtained.
- An oligonucleic acid compound (1) having a bond can be produced.
- the operation of the above step 6 is performed before the operation of the above step 5, and then the operation of the above step 5 is performed, and then the operation of the above step 7 is performed next. It can also be isolated and purified.
- a method for producing an oligonucleic acid compound having a phosphorothioate bond by a liquid phase method is, for example, by condensing nucleic acid synthesis units step by step through the following steps a to d, and the degree of nucleic acid polymerization: 2:
- An oligonucleic acid compound having a phosphorothioate bond of LOO can be produced.
- V is generally used as long as it is generally used for oligo DNA synthesis.
- nucleic acid monomer block examples include compounds represented by the following general formula (10b), which are available as manufactured or commercially available products according to known methods.
- R 2pb represents acyl or a substituent represented by the following general formula (3b).
- acyl according to R 2pb include the same as described above. Among them, the same can be mentioned.
- nucleic acid dimer unit is represented, for example, by the following general formula (2a) or (2b)
- Examples thereof include an optically active nucleic acid dimer compound.
- oligonucleic acid unit is, for example, a compound represented by the following general formula (l ib), or a nucleic acid monomer unit, a nucleic acid dimer unit or an oligonucleic acid unit through steps a and b.
- An oligonucleic acid compound produced by condensing (l ib) can be mentioned.
- Step a Selective deprotection step.
- the selective deprotection step is a step of producing a selectively deprotected compound by allowing a reagent that removes the protecting group at the 5′-position or 3′-position to act on the nucleic acid synthesis unit.
- a reagent that removes the protecting group at the 5′-position or 3′-position to act on the nucleic acid synthesis unit.
- a nucleic acid synthesis unit such as a nucleic acid monomer unit, a nucleic acid dimer unit or an oligonucleic acid unit
- a protecting group which is substituted with a hydroxyl group at the 5-position is used.
- a step for removing for example, a cyanoethyl group, which is a protecting group on a phosphate group substituted with a hydroxyl group at the 3 ′ position.
- a cyanoethyl group which is a protecting group on a phosphate group substituted with a hydroxyl group at the 3 ′ position.
- the “reagent for removing the cyanoethyl group” include pyridine-triethylamine-water.
- Examples of the “reagent for removing the 4,4′-dimethoxytrityl group” include triclonal acetic acid and acetic acid.
- the amount of "reagent for removing 4,4'-dimethoxytrityl group” and “reagent for removing cyanoethyl group” used is 1 to 20 times that of 4,4'-dimethoxytrityl group or cyanoethyl group to be removed. Molar amount, more preferably 1 to 10 times molar amount.
- the reaction temperature in the above reaction is, for example, suitably 20 ° C to 100 ° C, preferably 0 ° C to 80 ° C, more preferably 5 ° C to 30 ° C.
- the reaction time varies depending on the type of raw material used and the reaction temperature, but usually 1 minute to 1 hour is appropriate.
- Step b Condensation step, This step is usually carried out in the presence of an excess of organic amine in an appropriate solvent in the presence of two types of selectively deprotected nucleic acid synthesis units (for example, nucleic acid synthesis from which the 5'-position hydroxyl protecting group has been eliminated). It can be carried out by allowing a condensing reagent to act on the unit and the nucleic acid synthesis unit from which the protecting group for the hydroxyl group at the 3 ′ position has been eliminated.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction.
- ethers such as tetrahydrofuran, jetyl ether, 1,4 dioxane, -tolyl such as acetonitrile, pio-tolyl, benzene
- hydrocarbons such as toluene, organic amines such as pyridine, and mixed solvents thereof.
- the amount of the condensing reagent used is suitably 1 to 20 times the molar amount of the nucleic acid monomer unit, nucleic acid dimer unit or oligonucleic acid unit which is the nucleic acid synthesis unit, and 1 to 10 times the molar amount. Is preferred.
- the reaction temperature is suitably, for example, 20 ° C to 100 ° C, preferably 0 ° C to 80 ° C, more preferably 5 ° C to 30 ° C.
- the reaction time varies depending on the type of raw material used and the reaction temperature, but usually 30 minutes to 100 hours is appropriate.
- Step c A step of removing all protecting groups.
- This step is a step of removing all the protecting groups of the protected oligonucleic acid conjugate having a desired chain length produced by repeating the above steps a and b.
- Examples of the “reagent for removing each protecting group” used in this step include ammonia, a reagent for removing a silyl group, and an acid.
- ammonia examples include an aqueous solution of ammonium hydroxide and an ammonia Z methanol solution.
- the reaction temperature is suitably 18 ° C to 75 ° C, preferably 18 ° C to 65 ° C, more preferably 25 ° C to 55 ° C.
- the reaction time is suitably 1 to 30 hours, preferably 1 to 24 hours.
- the concentration of hydroxyammonium hydroxide in the solution used for deprotection is suitably 20 to 30% by weight, preferably 25 to 30% by weight.
- the amount of reagent used is In terms of the protecting group to be removed, a molar amount of 1 to LOO is suitable, and a molar amount of 10 to 50 is preferred.
- Examples of the “reagent for removing a silyl group” include a protecting group for the hydroxyl group at the 2′-position, and examples thereof include tetra-n-butylammonium fluoride and hydrogen trifluoride's triethylamine salt.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include tetrahydrofuran, N-methylpyrrolidone, pyridine, triethylamine, and a mixed solvent thereof. Reaction temperature is 20 ° C ⁇ 80
- the reaction time varies depending on the type of deprotecting agent used and the reaction temperature, but usually 1 hour to 100 hours is appropriate.
- the amount of the reagent to be used is suitably 50 to 500-fold molar amount with respect to the protecting group to be removed, and preferably 50 to: L00-fold molar amount.
- Examples of the “acid” include triclonal acetic acid and acetic acid.
- the acid can also be used after diluting with an appropriate solvent.
- Examples of the reaction solvent include dichloromethane, acetonitrile, water, and a mixed solvent thereof.
- the reaction temperature is suitably 20 ° C to 50 ° C.
- the reaction time varies depending on the type of acid used and the reaction temperature, and usually 1 minute to 1 hour is appropriate.
- the amount of reagent used is suitably 1 to 100 times the molar amount of the compound supported on the solid support, preferably 1 to 10 times the molar amount! (4) Step d: Purification step.
- Purification process refers to the usual separation and purification means from the above reaction mixture, for example, extraction, concentration, neutralization, filtration, centrifugation, recrystallization, C force C reverse phase column chromatography, C force
- nucleic acid dimer compound (2a) or (2b) is used as a nucleic acid synthesis unit. Ribonuclear as a constituent monomer of the compound
- At least one acid compound must be used. [0054] 1 (c).
- nucleic acid dimer compound (2a) or (2b) in which the phosphorothioate binding site is highly protected so as not to cause racemization in the case of the solid phase method, the nucleic acid dimer compound) (2a) or (2b), in the case of the liquid phase method, the nucleic acid dimer compound (2a
- this method forms only phosphodiester bonds in the same way as conventional methods for producing oligonucleic acid compounds. .
- the present invention makes it possible to easily produce a highly pure oligonucleic acid compound by using the highly pure nucleic acid dimer compound (2a) or (2b) as one of the nucleic acid synthesis units. It is a manufacturing method that can. ⁇ or as a purity oligonucleic acid compounds prepared by the present invention, f Retsumen is ,, 50 0 / 0-100 0/0 force S appropriate, from 95 to 99.99 0/0 force S Preferably, 99 ⁇ 99.9% is more preferred.
- Examples of the present invention include optically active nucleic acid dimer compounds represented by the following general formula (2a) or (2b) (hereinafter referred to as “the nucleic acid dimer of the present invention”).
- the nucleic acid dimer of the present invention has a feature that it does not cause racemization because it has a highly protected optically active phosphorothioate binding site. Therefore, the nucleic acid dimer of the present invention is useful as a raw material compound for producing an optically active oligonucleic acid compound (1) having a phosphorothioate bond, for example.
- nucleic acid dimer of the present invention include the following compounds 1. to 14.
- the nucleic acid dimer of the present invention can be produced as follows.
- the raw material when there is a substituent that is not desired to react with the raw material (for example, hydroxy, amino-containing carboxy), the raw material is subjected to a protective group (for example, a benzoyl or 4-sulfol group) according to a known method in advance. Generally, it is used for the reaction after protecting with. After the reaction, the protecting group can be removed according to a known method such as catalytic reduction, alkali treatment, acid treatment or the like.
- a protective group for example, a benzoyl or 4-sulfol group
- the nucleic acid dimer of the present invention can be produced from a known compound or an easily manufacturable intermediate through, for example, the following Step A to Step D.
- Step A A step of producing a nucleic acid dimer compound (15). [Chemical 17]
- R 2x represents a substituent represented by the following general formulas (13a) to (13e).
- R 3a and R 3b are the same or different and each represents alkyl.
- R 3e , R 3d and R 3e represent alkyl.
- R 3i represents alkyl, aryl, or a bicyclic heterocyclic ring.
- q, r, s, and t each independently represent an integer in the range of 1 to 2.
- Examples of the “alkyl” relating to R 3a , R 3b , R 3 R 3d , R 3e , and R 3i include the same ones as described above. Among them, the “alkyl” related to R 3a , R 3b and R 3e can be the same as the “alkyl” related to R 2a and R 2b . Examples of the “alkyl” related to R 3 R 3d and R 3i include the same “alkyl” related to R 2e .
- aryl and “1-2-cyclic heterocycle” according to R 3i are the same as those described above. Among them, the “aryl” related to R 3i can be the same as the “aryl” related to R 2d .
- the nucleic acid compound (13) can be produced by dissolving the nucleic acid compound (12) in an appropriate solvent and reacting with an appropriate phosphorylating reagent. This reaction itself is known This can be done according to the method.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include dichloromethane, acetonitrile, toluene, and a mixed solvent thereof.
- Examples of the “phosphorylating reagent” include 2-chlorophenol dichlorothiophosphate, 2,4 dichlorophenol dichlorophosphate, 2-cyanoethyl diisopropylchlorophosphoramidite, 2-cyanoethyl tetraisopropylphosphorodioxide. Mention may be made of amidites.
- the amount of the phosphorylating reagent used is preferably 1 to 20 times the molar amount relative to the compound (12), more preferably 1 to 10 times the molar amount.
- the reaction temperature in the above reaction is preferably 0 ° C to 50 ° C.
- the reaction time varies depending on the type of raw material used and the reaction temperature, but usually 30 minutes to 100 hours is appropriate.
- a nucleic acid dimer compound (15) is produced by dissolving the nucleic acid compound (13) in an appropriate solvent and reacting the nucleic acid compound (14) with an appropriate active agent or condensing agent. can do. This reaction itself can be performed by a known method.
- activator examples include 1H-tetrazole, 5-ethylthiotetrazole, 3,4-dichloroimidazole, 3,4-disianoimidazole, benzotriazole triflate, imidazole triflate, 5- (4--trophee -L) 1 1H-tetrazole, diisopropylaminotetrazolide.
- condensing agent examples include 1- (2-methyrenesulfonyl) 3 ditrow 1, 2,4 triazole, 2, 4, 6 trimethylbenzensulfol tetrazole or 1 (2, 4, 6 triisopropyl).
- the use amount of the activator or condensing agent is preferably 1 to 20 times the molar amount relative to the nucleic acid compound (13), more preferably 1 to: LO times the molar amount.
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include dichloromethane, acetonitrile, toluene, and a mixed solvent thereof.
- a suitable reaction temperature is 0 ° C to 50 ° C.
- the reaction time varies depending on the type of raw materials used, reaction temperature, etc. Usually, 30 minutes to 100 hours is appropriate.
- R 2x is a substituent (13a) to (13d), for example, it can be oxidized with a sulfurizing reagent.
- a sulfurizing reagent examples include sulfur, 3H-1,2, benzodithiol 3-one 1,1-dioxide (view cage reagent), 3 amino-1,2,4-dithiazole-5 thione (ADTT).
- the amount of the sulfurizing reagent used is preferably 1 to 20 times the molar amount, more preferably 1 to 10 times the molar amount with respect to the nucleic acid compound (13).
- the solvent used when oxidizing with the sulfurizing reagent is not particularly limited as long as it does not participate in the reaction, and examples thereof include dichloromethane, acetonitrile, pyridine, and a mixed solvent thereof.
- the nucleic acid dimer compound (15) produced in this step is a one-to-one diastereomeric mixture because it has an asymmetric center at the phosphorothioate-bound phosphorus atom.
- the nucleic acid compound (13) in which R 2x is an optically active substituent (13d) is used, the ratio is shifted to one diastereomer, so that the separation step of the next step may be simplified. is there.
- Step B A step of producing an optically active nucleic acid dimer compound (15a) or (15b) by separation.
- the nucleic acid dimer compound (15) which is a diastereomeric mixture, can be separated into optically active nucleic acid dimer compounds (15a) and (15b) having phosphorothioate bonds by a separation operation such as silica gel chromatography. .
- nucleic acid dimer compounds (15a) and (15b) produced in this step are nucleic acid dimers of the present invention in which R 2 is acyl.
- Step C A step of selectively removing R 2y of the nucleic acid dimer compound (15a) or (15b).
- the nucleic acid dimer compound (16a) or (16b) can be produced by dissolving the nucleic acid dimer compound (15a) or (15b) in an appropriate solvent and reacting with a reagent that selectively removes R 2y. .
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include pyridine, acetonitrile, and a mixed solvent thereof.
- examples of the “reagent for selectively removing R 2y ” include R 1al or R la2 is tert-butyldimethylsilyl, R 4 is 4,4′ -dimethoxytrityl, and R 3 is 2 —If it is cyanoethyl and R 2y is levulinyl, the reagent for selectively removing R 2y should include 0.5M hydrazine monohydrate Z acetic acid pyridine (1: 4) solution. Can do.
- the amount of the “reagent for selectively removing R 2y ” is 1 to 20 times the molar amount, more preferably 1 to 10 times the molar amount of the nucleic acid dimer compound (15a) or (15b). It is.
- the reaction temperature is preferably 0 ° C to 50 ° C.
- the reaction time varies depending on the type of raw materials used, reaction temperature, etc. Usually, 30 minutes to 100 hours is appropriate.
- Step D A step of producing the nucleic acid dimer compound (17a) or (17b).
- the nucleic acid dimer compound (17a) or (17b) can be produced by dissolving the nucleic acid dimer compound (16a) or (16b) in an appropriate solvent and allowing the phosphate reagent to act.
- nucleic acid dimer compounds (17a) and (17b) produced in this step are the nucleic acid dimers of the present invention in which R 2 is the substituents (3 a) and (3b).
- the reaction solvent is not particularly limited as long as it does not participate in the reaction, and examples thereof include dichloromethane, acetonitrile, toluene, and a mixed solvent thereof.
- Examples of the “phosphoric acid reagent” include 2-cyanoethyl diisopropyl chloride phosphoramidite, 2-cyanoethyl tetraisopropyl phosphorodiamidite, 2-chlorophenyl phosphoryl dichlorate. Id can be mentioned.
- the phosphorylating reagent is used in an amount of 1 to 20 times, more preferably 1 to 10 times the molar amount of the nucleic acid dimer compound (16a) or (16b).
- the reaction temperature is suitably, for example, ⁇ 20 ° C.
- the optically active oligonucleic acid compound represented by the following general formula (1) (hereinafter referred to as “the oligonucleic acid of the present invention”) will be described in detail.
- n is suitably an integer in the range of 1 to 99, preferably an integer in the range of 10 to 50, more preferably an integer in the range of 15 to 30.
- the present invention also includes a photoactive oligonucleic acid compound having a phosphorothioate bond represented by the following general formula (4) (in combination with the oligonucleic acid compound (1): Also referred to as “oligonucleic acid”).
- T 1 represents hydrogen or a substituent represented by the following general formula (5a).
- T 2 represents a hydroxyl group or a substituent represented by the following general formula (5a) or (5b).
- n is suitably an integer in the range of 1 to 49, preferably an integer in the range of 5 to 25, and more preferably an integer in the range of 7 to 15.
- the oligonucleic acid of the present invention can be used as a free acid. It can also be used in the form of a salt according to a known method. Examples of such “salts” include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as calcium salts, and tertiary organic amine salts such as triethylamine and pyridine.
- the present invention includes, for example, the oligonucleic acid of the present invention or a salt thereof, wherein the phosphorothioate binding force existing in the molecule is Rp configuration or Sp configuration.
- examples of the present invention include a highly pure oligonucleic acid of the present invention.
- the purity of the present invention oligo nucleic acid for example, is suitably from 50% to 100%, 95-99. 99% strength S preferably ⁇ , 99-99. Preferably from 9 0/0 power! / ⁇ 0
- the present inventors have found that the RNA that can form a complementary strand with it is the same as or more than the natural oligo RNA. It was revealed that a hybrid having affinity and thermodynamically stable was formed (Test Example 1). Therefore, it was revealed that the oligonucleic acid of the present invention is a useful compound as an antisense molecule. Among them, the oligonucleic acid of the present invention in which phosphorothioate bonds are all in the Rp configuration is particularly useful as an antisense molecule.
- the present inventors have clarified that the oligonucleic acid of the present invention is more resistant to nucleolytic enzymes (phosphodiesterase I, sushi serum) than natural oligo RNAs having the same sequence ( Test example 3, test example 4).
- nucleolytic enzymes phosphodiesterase I, sushi serum
- natural oligo RNAs having the same sequence Test example 3, test example 4.
- Examples of the present invention include natural oligo RNA having a sequence complementary to the oligonucleic acid of the present invention or a double-stranded oligonucleic acid mixture with the oligonucleic acid of the present invention.
- the double-stranded oligonucleic acid compound is a pair of 12 to 52 base oligonucleic acid compound having a double strand forming part of 10 to 50 base pairs,
- the mRNA complementary to the double-stranded oligonucleic acid conjugate is cleaved, and thereby a pair of oligonucleic acids having an activity that suppresses the synthesis of the gene product encoded by the mRNA.
- the double-stranded oligonucleic acid conjugate is not limited to the siRNA reported by Tusc hi et al.
- the double-stranded oligonucleic acid of the present invention it is a pair of 12-52 base oligonucleic acid compounds, more preferably a pair of 15-30 base oligonucleic acid compounds.
- the double-stranded oligonucleic acid of the present invention when introduced into a cell as a complex with a ribosome, exhibits RNA interference equivalent to that of a single-stranded oligo-RNA of oligo RNA consisting of all phosphodiester bonds having the same sequence. It was shown that it suppresses protein expression (Test Example 2). Therefore, it was revealed that the double-stranded oligonucleic acid of the present invention is a useful compound as siRNA.
- nucleolytic enzyme phosphoesterase I
- phosphoesterase I nucleolytic enzyme
- the present invention includes a complex of the oligonucleic acid of the present invention and a carrier effective for transferring the oligonucleic acid into cells, or the double-stranded oligonucleic acid of the present invention and the double-stranded
- a pharmaceutical composition comprising a complex with a carrier effective for transferring an oligonucleic acid into cells is provided.
- the pharmaceutical composition of the present invention includes, for example, diseases caused by overexpression of Bel-2 protein, diseases desired to promote apoptosis, Or it can be used for treatment and Z or prevention of hematological malignancies. These diseases specifically include hematological malignancies including both lymphoma and leukemia, and solid tumors such as liver cancer, skin cancer, breast cancer, lung cancer, gastrointestinal cancer, prostate cancer, uterine cancer, bladder Such as cancer.
- the carrier that forms a complex with the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention is effective for transferring the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention into a cell.
- a cationic carrier such as a cationic polymer, or a carrier that uses a viral envelope.
- Desirable cationic ribosomes include ribosomes containing 2-0- (2-jetylaminoethyl) -powered rubermoyl 1,3-O-dioleoylglycerol (hereinafter referred to as ribosome A), oligofetamine ( Invitrogen), Lipofectin (Invitrogen), Lipofectamine (Invitrogen), Ribophetamine 2000 (Invitrogen), DMRIE—C (Invitrogen), GeneSilencer (Gene Therapy Systems), TransMessenger (QIAGEN), TransIT TKO (Miru s) , Etc.
- ribosome A oligofetamine
- Invitrogen Lipofectin
- Lipofectamine Invitrogen
- Ribophetamine 2000 Invitrogen
- DMRIE—C Invitrogen
- GeneSilencer Gene Therapy Systems
- TransMessenger QIAGEN
- TransIT TKO TransIT TKO
- Desirable cationic polymers include JetSI (Qbiogene), Jet-PEI (polyethyleneimine; Qbiogene), and the like. Desirable as a carrier utilizing a viral envelope is GenomeONE (HVJ-E ribosome; Ishihara Sangyo) etc.
- the oligonucleic acid or double-stranded oligonucleic acid of the present invention contained in the pharmaceutical composition of the present invention and a carrier Can be prepared by methods known to those skilled in the art. Briefly, it is prepared by mixing a carrier dispersion having an appropriate concentration and a solution of the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention.
- the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention is negatively charged in an aqueous solution.
- a strand oligonucleic acid and a cationic carrier easily form a complex.
- an electrolyte solution such as water for injection, distilled water for injection and physiological saline, and a sugar solution such as glucose solution and maltose solution may be used.
- those skilled in the art can appropriately select conditions such as pH and temperature when forming the complex.
- the oligonucleic acid of the present invention in a 10% maltose aqueous solution is added to a 16 mg Zml ribosome dispersion in a 10% maltose aqueous solution.
- the solution of the double-stranded oligonucleic acid of the present invention is gradually added while stirring at pH 7.4 and 25 ° C.
- the composite can be made into a uniform composition by carrying out a dispersion treatment using an ultrasonic dispersion device or a high-pressure emulsification device if necessary.
- a dispersion treatment using an ultrasonic dispersion device or a high-pressure emulsification device if necessary.
- the optimal method and conditions for preparing the complex of the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention and the carrier depend on the carrier to be used. The best method can be selected.
- the compounding ratio of the oligonucleic acid of the present invention or the complex of the present invention double stranded oligonucleic acid and the carrier contained in the pharmaceutical composition of the present invention is 1 part by weight of the oligonucleic acid of the present invention or the double stranded oligonucleic acid of the present invention 1 to 200 parts by weight of support is suitable. Desirably, it is 2.5 to: LOO parts by weight, more preferably 10 to 20 parts by weight with respect to 1 part by weight of the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention.
- the pharmaceutical composition of the present invention may contain a pharmaceutically acceptable carrier or diluent in addition to the complex of the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention and a carrier.
- Acceptable carriers or diluents are essentially chemically inert and harmless compositions that do not have any effect on the biological activity of the pharmaceutical composition of the present invention. Examples of such carriers or diluents include, but are not limited to, salt solutions, sugar solutions, daricerol solutions, ethanol and the like.
- compositions of the invention are provided in a form that contains an effective amount of the conjugate for therapeutic and Z or prevention and can be effectively administered to a patient.
- the pharmaceutical composition of the present invention may be in the form of a liquid such as an injection or infusion, an external preparation such as an ointment or lotion, or a lyophilized formulation! /.
- this complex is present in the concentration range of 0.001 to 25% (wZv), preferably within the concentration range of 0.01 to 5% (wZv).
- wZv concentration range of 0.01 to 5%
- WZV concentration range of 0.1 to 2%
- the pharmaceutical composition of the present invention may be any pharmaceutically acceptable additive such as an emulsifying aid.
- agents for example, cabrylic acid, cabric acid, lauric acid, myristic Acid, palmitic acid, stearic acid, Oleic acid, linoleic acid, arachidonic acid, docosahexaenoic acid
- pharmaceutically acceptable salts thereof for example, sodium salt, potassium salt, calcium salt
- emulsification aids such as albumin and dextran
- cholesterol phosphati
- Stabilizers such as sodium chloride, glucose, maltose, ratatoose, sucrose, trehalose; hydrochloric acid, nitric acid, phosphoric acid, acetic acid, sodium hydroxide, potassium hydroxide, triethanolamine, etc.
- PH adjusting agent Any pharmaceutically acceptable additive can be added in an appropriate step either before or after dispersion of the complex.
- the lyophilized preparation can be prepared by subjecting the complex of the oligonucleic acid of the present invention or the double-stranded oligonucleic acid of the present invention to a carrier, followed by lyophilization.
- the lyophilization treatment can be performed by a conventional method. For example, a predetermined amount of the complex solution after the dispersion treatment described above is dispensed into a vial in a sterilized state, and pre-dried at about ⁇ 40 to ⁇ 20 ° C. for about 2 hours. Primary drying can be performed at 10 ° C. under reduced pressure, followed by secondary drying at about 15-25 ° C. under reduced pressure and lyophilized. In general, the inside of the nozzle can be replaced with nitrogen gas and stoppered to obtain a lyophilized preparation of the pharmaceutical composition of the present invention.
- the freeze-dried preparation of the present invention can be re-dissolved and used by adding an appropriate solution (re-dissolved solution).
- re-dissolved solution examples include electrolyte solutions such as water for injection and physiological saline, glucose solution, and other general infusion solutions.
- electrolyte solutions such as water for injection and physiological saline, glucose solution, and other general infusion solutions.
- the amount of this redissolved solution varies depending on the application and is not particularly limited, but it is suitably 0.5 to 2 times the amount of the solution before lyophilization, or 500 ml or less.
- the pharmaceutical composition of the present invention can be administered intravenously, intraarterially, orally, intratissueally, transdermally, transmucosally or transmucosally to animals including humans that are desired to be administered in dosage unit form. It can be administered rectally and may be administered by an appropriate method according to the patient's symptoms. Particularly preferred are intravenous administration, transdermal administration, and transmucosal administration. In addition, local administration such as local administration in cancer can also be performed. Needless to say, it is administered in dosage forms suitable for these administration methods, for example, various injections, oral preparations, drops, absorbents, eye drops, ointments, lotions, suppositories and the like.
- the dosage of the pharmaceutical composition of the present invention may vary depending on the patient's condition such as drug, dosage form, age and weight. It is desirable to determine the condition, route of administration, nature and degree of illness, etc., but in general, the amount of the oligonucleic acid of the present invention or the oligonucleic acid of the present invention is usually 0.1 mg Range power of 10 gZ Z human, preferably lmg to 500 mgZ day Z human range is common. In some cases, lower doses may be sufficient, and vice versa may be required, and may be given once to several times daily or at intervals of 1 to several days. Monkey.
- the DNA used to produce the double-stranded oligonucleic acid of the present invention can be made into a pharmaceutical composition together with pharmaceutically acceptable additives.
- the DNA used to generate the double-stranded oligonucleic acid of the present invention has a base sequence of the duplex forming part of the double-stranded oligonucleic acid of the present invention as a deoxyribonucleotide (wherein the nucleotide sequence Uracil is converted to thymine) means a plasmid or the like for producing a double-stranded oligonucleic acid of the present invention containing DNA.
- DMTr is 4,4-dimethoxytrityl
- ps is O— (2-cyanoethyl) thiophosphoryl
- s is thiophosphoryl
- Lev is lebrilyl
- CEP is 2-cyanoethyl N , N-diisopropyl phosphoramidite
- TBDMS tert-butyldimethylsilyl
- A adenosine, C, cytidine, G, guanosine, U, uridine
- DT is a thymidine
- P A, P C, P G, P U represents a nucleic acid which is protected respectively.
- Rp and Sp represent a stereo on the phosphorus atom of the phosphorothioate bond.
- the number after the compound name indicates that it is an optically active compound.
- 1 is added to the compound with a large Rf value
- 2 is added to the compound with a small Rf value. did.
- the compound name produced using these raw material compounds is followed by the number of the raw material and the compound number.
- the target compound was prepared using DMTrO—Aps A—OLev-2 in the same manner as in Example 1, Step 3-1.
- Example 1 AsA-1 and AsA-2 obtained in Step 3-1 and Example 1 Step 3-2 are described in the literature (B. Karwowski et al. Bioorg. Med) Chem. Lett. 11 (2001) 1001 — 1003)
- svPDE snake venom phosphodiesterase
- NP1 AsA-2 nuclease P 1
- Example 1 the compound produced in Example 1 has the chemical structure shown in Table 1.
- Liquid feed LC— 6 A (Shimadzu Corporation)
- Solution A 50 mM triethylamine-acetic acid buffer solution containing 5% acetonitrile
- Solution B 50 mM triethylamine acetate buffer containing 90% acetonitrile
- Diastereomer with a large Rf value (DMTrO— P Ups P U—OLev—1; Example 2-1): 1. 05 g, 77% yield Small diastereomers (DMTrO— p Ups p U—OLev— 2; Example 2-2): 1. 12 g, 8 2% yield
- Step 2-1 Using DMTrO— P Ups P U—OLev-l and using the same method as in Example 1, Step 2-1, 1.37 g of the target compound was obtained as a white foam.
- Example 1 In the same manner as in Step 3-1, DMTrO— p Ups p U—OCEP—1 to UsU—1 and DMTrO— p Ups p U—OCEP—2 to UsU—2 were produced, respectively. In the same way as in step 4, the structure of UsU-1 and UsU2 was determined. The results are shown in Table 2 [Table 2]
- Example 1 In the same manner as in Step 3-1, DMTrO— p Aps p G—OCEP—1 to AsG—l and DMTrO— p Aps P G—OCEP—2 to AsG—2 were produced, respectively. In the same manner as in step 4, the structures of AsG-1 and AsG-2 were determined. The results are shown in Table 3, [Table 3]
- the target compound was produced using DMTrO— p Gps p A—OLev-1 in the same manner as in Example 1, step 2-1.
- Example 1 In the same manner as in Step 3-1, DMTrO— P Gps P A—OCEP—l to GsA—1 and DMTrO— P Gps P A—OCEP—2 to GsA—2 were produced, respectively. In the same manner as in step 4, the structures of GsA-1 and GsA-2 were determined. The results are shown in Table 4.
- the target compound was prepared in the same manner as in Example 1, Step 2-1.
- Diastereomer with a large Rf value (DMTrO— p Aps p C—OLev—1; Example 6—1): 3.57 g
- the target compound was produced using DMTrO— p Aps p C—OLev-2 in the same manner as in Example 1, Step 2-1.
- Example 1 DMTrO— p Aps p C—OCEP—1 to AsC—1 and DMTrO— p Aps p C—OCEP—2 to AsC—2 were produced in the same manner as in Step 3-1, respectively. In the same manner as in step 4, the structures of AsC-1 and AsC-2 were determined. The results are shown in Table 6.
- Diastereomer with a large Rf value (DMTrO— p GpsdT—OLev—1; Example 7-1): 3.18 g
- the target compound was produced using DMTrO- P GpsdT-OLev-l in the same manner as in Example 1, Step 2-1.
- Example 1 In the same manner as in Step 3-1, DMTrO— p GpsdT—OCEP—1 and GsdT—1, and DMTrO— p GpsdT—OCEP—2 to GsdT—2 were produced, respectively. In the same manner, the structure of GsdT-1 GsdT-2 was determined. The results are shown in Table 7.
- the CPG column (DMTr-ON) was treated with concentrated aqueous ammonia Z ethanol (3Z1) to cleave the solid phase carrier, and then incubated at 55 ° C for 17 hours to deprotect the base protecting group. This was concentrated to dryness and stirred in a mixed solution of 3HF / TEA, TEA, N-methylpyrrolidine and N-methylpyrrolidone at 55 ° C. for 2 hours to deprotect the hydroxyl-protecting group at the 2 ′ position. The reaction solution was cooled to room temperature, poured into 2-propanol, and the resulting precipitate was collected by centrifugation.
- concentrated aqueous ammonia Z ethanol (3Z1)
- Liquid feed LC— 6 A (Shimadzu Corporation)
- UV-visible spectrometer detection wavelength 260nm
- the target compound was synthesized in the same manner as in Example 8 using SpTr DMTrO-ApsA-OCEP-2.
- the target compound was synthesized in the same manner as in Example 8 using DMTrO-UpsU-OCEP 1 which is an Rp form. Ion exchange HPLC analysis was used to confirm that the target compound was almost single. The same measurement conditions as in Example 8 were used.
- the target compound was synthesized using the same method as Example 8 using SpTr DMTrO-UpsU-OCEP 2. Ion exchange HPLC analysis was used to confirm that the target compound was almost single. The same measurement conditions as in Example 8 were used.
- DMTrO— P Aps P G-OCEP-1 which is Rp, DMTrO— P Gps P A—O CEP— 1 which is Rp, DMTrO— P Aps P A—OCEP—1, which is Rp, Rp DMTrO- P U ps P C- OCEP- 1 , is Rp body DMTrO- P Aps P C- OCEP- 1, is Rp body DM TrO- P GpsdT- OCEP- Asetonitoriru 2 so that each becomes 0. 1M
- the amidite solution dissolved in 1 and the solid phase carrier is a commercially available thymidine CPG column, the condensation catalyst is tetrazole, the oxidizing agent is 2.
- OM tert butyl hydride peroxide in dichloromethane solution the cabbing solution is acetic anhydride and N-methyl
- an oligonucleic acid compound was synthesized by an automatic nucleic acid synthesizer (Expedite TM) in the same manner as in Example 8 to obtain the desired compound. Reverse phase HPLC analysis was used to confirm that the target compound was almost single. The same measurement conditions as in Example 1 were used.
- DMTrO— p Aps p G-OCEP-2 Sp form DMTrO— p Gps p A—O CEP—2, Sp form DMTrO— p Aps p A—OCEP—2, Sp form DMTrO- using P U ps P C- OCEP- 2, DM TrO- P GpsdT- OCEP- 1 is DMTrO- P Aps P C- OCEP- 2, Sp which is a Sp body, as in example 8
- an oligonucleic acid compound was synthesized to obtain the target compound. Reverse phase HPLC analysis was used to confirm that the target compound was almost single. The same measurement conditions as in Example 1 were used.
- the final concentration of 21 mer (A) of the oligonucleic acid compound synthesized in Example 8, the oligonucleic acid compound synthesized in Example 9, or natural adenosine is 1.
- a phosphate buffer solution (0.1 M sodium chloride, 10 mM sodium phosphate, pH 7.5) containing the same amount of polyuridic acid (Poly (U)) as the sample was prepared.
- Each sample solution prepared in this way was heated to 70 ° C and then slowly cooled to room temperature. Then, using a Hitachi U-3210 self-recording spectrophotometer, it took 120 minutes from 20 ° C to 80 ° C. The absorbance at 260 nm was measured while raising the temperature. Each double-stranded melting temperature (Tm value) was determined from the obtained absorbance temperature curve.
- the oligonucleic acid compound produced in Example 10 the oligonucleic acid compound produced in Example 11, or the natural uridine 21mer (U) and polyadenylic acid (Po
- oligonucleic acid of the present invention has an affinity for RNA similar to or higher than that of natural oligo RNA.
- oligonucleic acid compounds in which all phosphorothioate bonds in the oligonucleic acid compound are Rp have been clearly improved in affinity.
- Double-stranded oligonucleic acid conjugates were introduced into A431 cells together with a carrier, and the Bel-2 protein expression inhibitory activity was quantitatively evaluated by Western blotting. Preparation of two-chain oligonuclear compound phase.
- ribosome A containing 2-0- (2-jetylaminoethyl) -powered rubermoyl 1,3-O-dioleoylglycerol and purified egg yolk lecithin as a carrier, a complex with a double-stranded oligonucleic acid complex was prepared. Prepared.
- a complex was prepared by mixing 16 parts by weight of ribosome A with 1 part by weight of a double-stranded oligonucleic acid compound.
- preparation of 2 ml of a complex solution with a final concentration of 300 nM of a double-stranded oligonucleic acid compound is shown.
- concentration of the double-stranded oligonucleic acid conjugate complex is V, which is included in the complex when it is assumed that the double-stranded oligonucleic acid conjugate is completely double-stranded. Indicated by the molar concentration of the double-stranded oligonucleic acid compound.
- the sense strand and the antisense strand dissolved in water for injection were diluted with 10% maltose to prepare a double-stranded oligonucleic acid compound solution containing both strands at a concentration of 600 nM.
- 16 mg Zml of ribosome A dispersion was diluted to 0.130 mgZml with 10% maltose.
- a double-stranded oligonucleic acid compound-ribosome complex solution having a final concentration of double-stranded oligonucleic acid compound of 300 nM was prepared.
- This composite was dispersed for 15 seconds using a 600 W bath-type ultrasonic device to make the composite particles uniform.
- A431 cells epidermal cancer cells
- DMEM medium Sigma, D6046
- the DMEM medium (Sigma, D6046) containing 0% FBS was added and the medium was changed.
- the cells were cultured for 72 hours in a 37 ° C 5% CO incubator. Cells are washed with PBS (Phosphate buffer
- a polyacrylamide gel (ATTO E-T520L) was used, and 15 g of sample was applied per lane. After completion of electrophoresis, the protein in the gel was transferred to a polyvinylidene fluoride (PVDF) membrane, and PBST containing 5% skim milk (PBST-MLK; where PBST was composed of 0.1% Tween20 in PBS buffer) Blocked for 1 hour at room temperature.
- PVDF membrane that has been blocked
- DAKO M0887 mouse anti-human Bel-2 monoclonal antibody diluted 500 times with BST-MLK
- the amount of Bel-2 protein when a double-stranded oligonucleic acid compound (GL3) that suppresses luciferase expression was transfected was used as a negative control.
- the double-stranded oligonucleic acid conjugate used is shown below.
- the single-stranded oligonucleic acid compound used is shown below.
- Table 10 shows the results of the degradation resistance of these single-stranded oligonucleic acid compounds to exonuclease.
- a 32 P-labeled single-stranded oligonucleic acid compound was obtained in the same manner as in Test Example 3. 40 1 of 10% ⁇ shea serum 32 P-labeled RN A3. 3 pmol and incubated for 30 minutes at 37 ° C. The reaction was stopped by recovering 9 1 and extracting with phenol Z black mouth form. PAGE was performed by the method of Test Example 3, and 21-base RNA was quantified. Collected immediately after addition of sushi serum The single-stranded oligonucleic acid compound was defined as a residual rate of 100%.
- the single-stranded oligonucleic acid compound used is shown below.
- Double-stranded RNA was formed by reducing the temperature from 70 ° C to 37 ° C over 1 hour at 1 minute at C and 1 minute at 70 ° C. Desalted with MicroSpin G-25 Columns (Amersham Bioscience). 33 mM Tris—HCl (pH 8.9), 0.6 pM in double-stranded RNA 400 pmol in 0.6 67 mM MgCl
- Phosphodiesterase I Exonuclease from Crotalus Ada manteus Venom; Worthington Biochemical Corporation
- 258 mU of Phosphodiesterase I was incubated at 7 ° C for 15 minutes. After the incubation, the reaction was stopped by extracting 10 ⁇ l with phenol and chloroform. The aqueous layer was confirmed by PAGE.
- Double-stranded RNA was analyzed by polyacrylamide gel electrophoresis (PAGE; 12% polyacrylamide; acrylamide: bisacrylamide 19: 1; 89 mM TrisZ89 mM boric acid Z2 mM EDT A). After staining with ethidium bromide, 19 base pair RNA was quantified using ChemiDoc (BioRad). The residual ratio of 19 base pair RNA recovered immediately after enzyme addition was defined as 100%.
- the double-stranded oligonucleic acid compound used is shown below.
- the natural double-stranded oligonucleic acid compound has no degradation resistance to exonuclease, but the oligonucleic acid of the present invention having a phosphoroate bond is not As a result, it was found that a large number of compounds remained and the degradation resistance to exonuclease was very high. Among them, the oligonucleic acid of the present invention in which all of the thioate bonds are Sp was found to have a remarkable effect. Industrial applicability
- the method for producing an optically active oligonucleic acid compound having a phosphorothioate bond according to the present invention is known in the prior art1, and the method for producing an oligonucleic acid compound having a phosphorothioate bond Unlike the conventional method for producing an oligonucleic acid compound, only a phosphodiester bond is formed.
- an optically active nucleic acid dimer compound having a high purity phosphorothioate bond as a nucleic acid synthesis unit, an optically active oligonucleic acid compound having a high purity phosphoroate bond can be easily produced. This is a possible manufacturing method.
- nucleic acid dimer of the present invention is a nucleic acid dimer compound having a phosphoroate bond
- an optically active oligonucleic acid compound having a phosphoroate bond is produced. It is useful as a raw material compound that can be made.
- an optically active oligonucleic acid compound having a phosphorothioate bond that can be produced using at least one nucleic acid dimer of the present invention is compared with a natural oligonucleic acid compound having the same sequence. Thus, it showed very high resistance to exonuclease or sushi serum.
- an optically active oligonucleic acid compound having a phosphorothioate bond and having a sequence similar to that of a natural type oligo RNA having a cleavage activity for a target gene (mRNA) is synthesized with a natural type oligo RNA. Since the oligonucleic acid of the present invention having various enzyme resistances is useful as a therapeutic agent, diagnostic agent, or research reagent because it has almost the same or higher affinity and cleavage activity for almost the same target gene (mRNA). .
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WO2001040515A1 (en) * | 1999-11-12 | 2001-06-07 | Isis Pharmaceuticals, Inc. | Gapped oligomers having site specific chiral phosphorothioate internucleoside linkages |
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