WO1999020641A1 - New triplex forming oligonucleotides and their use in anti-hbv - Google Patents
New triplex forming oligonucleotides and their use in anti-hbv Download PDFInfo
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- WO1999020641A1 WO1999020641A1 PCT/CN1998/000248 CN9800248W WO9920641A1 WO 1999020641 A1 WO1999020641 A1 WO 1999020641A1 CN 9800248 W CN9800248 W CN 9800248W WO 9920641 A1 WO9920641 A1 WO 9920641A1
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/113—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing
- C12N15/1131—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing against viruses
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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
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- C12N2310/00—Structure or type of the nucleic acid
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- C12N2310/15—Nucleic acids forming more than 2 strands, e.g. TFOs
Definitions
- Novel triple helix-forming oligonucleotide and its application in anti-HBV technology Novel triple helix-forming oligonucleotide and its application in anti-HBV technology
- the present invention relates to a novel triple-helix-forming oligonucleotide, in particular to a novel triple-helix-forming oligonucleotide and its modified derivative with a two-stage homopolypurine / homopolypyrimidine sequence that forms a triple-helix DNA. Structure and its application in anti-HBV. technical background
- TFO Triplex Forming Oligonucleotide
- triple-helix DNA can inhibit the binding of protein factors to DNA.
- TFO with EDTA-Fe 2+ at the end is combined with a specific target sequence to form a triple helix DNA, and the target double-stranded DNA can be specifically cut at the position where the triple helix DNA is formed (Moser HE, Dervan PB., Science, 1987, 238: 645-50.). Therefore, the formation of triple helix DNA is expected to inhibit gene expression at the DNA level, the so-called Antigene Strategy. Compared with antisense technology and ribozyme, it has its advantages.
- Triple helix-forming oligonucleotides use a specific sequence of double-stranded DNA as a binding site, and by forming a triple-helix DNA with a specific double-stranded DNA sequence or cutting the target DNA at the location of the triple-helix DNA, the gene transcription or replication is inhibited.
- Antisense nucleic acid and ribozyme All take mRNA as the target, and block mRNA expression by binding with mR A to block translation or promote mRNA degradation. In a cell, multiple mRNAs can be transcribed from a single DNA. Therefore, it may be more effective in blocking gene replication or transcription at the DNA level.
- a triple-helix-forming oligonucleotide fragment is designed in the promoter of a specific gene to form a triple-helix DNA with a specific sequence of the target gene, preventing DNA from binding to a protein or in a certain gene. Designing a triple-helix-forming oligonucleotide fragment with a specific sequence to form a triple-helix DNA at a specific site prevents replication and transcription complexes from passing, and can inhibit DNA replication or RNA transcription.
- the triple helix DNA formed by shorter TFO and shorter double-stranded target DNA is not stable and specific, so its inhibitory effect is not strong, which limits the practical application of anti-gene strategies. Only a few theoretical studies have been done to expand the range of target DNA formed by triple helix DNA, and there is no practical application.
- Home and Dervan et al. Designed an alternating triple-helix DNA, in which two homopolypurine sequences are located on two strands of double-stranded DNA, one part of TFO is paired with one purine strand in the double-strand, and the other part of TFO is Another pair of purine chains in the double strand (Home, DA, Dervan, PB, J. Ain. Chem.
- HBV is a hepatotropic DNA virus whose infection can cause acute or chronic hepatitis. 80% of patients with Hepatocellular Carcinoma (HCC) are infected with HBV. People with chronic HBV infection are at least 100 times more likely to develop HCC. China is a highly endemic region of Hepatitis B. About 8-10% of the population (approximately 100 million people) are positive for Hepatitis B (virus) Surface Antigen (HBsAg). Hepatitis B caused by HBV infection and its associated HCC are one of the major health problems worldwide. However, so far, effective treatments are still lacking in clinical practice.
- HCC Hepatocellular Carcinoma
- An object of the present invention is to provide a triple-helix-forming oligonucleotide capable of forming a triple-helix DNA structure with a homo-purine / homopyrimidine sequence close to the two segments.
- the triple helix-forming oligonucleotide can inhibit the expression of the hepatitis B virus gene and the reproduction of the hepatitis B virus. It includes two types of genes that can interact with the DR region of HBV and the second S promoter region of the HBV adr subtype, respectively.
- a homozygous purine / homopyrimidine sequence is combined with a triple helix to form an oligonucleotide. They can also be modified by 3 'monophosphorylation or other chemical modifications to improve stability.
- the triple helix-forming oligonucleotide can be used as a medicine for treating hepatitis B. Summary of the Invention
- the present invention provides a triple-helix-forming oligonucleotide capable of forming a triple-helix DNA structure with a homo-purine / homopyrimidine sequence close to the two segments.
- a triple helix-forming oligonucleotide capable of forming a triple-helix DNA structure with a homo-purine / homopyrimidine sequence close to the two segments.
- the corresponding triple helix-forming oligonucleotides were designed and applied on a DNA synthesizer
- the corresponding triple-helix-forming oligonucleotides and 3, monophosphorylated triple-helix-forming oligonucleotides were synthesized: (see Figures 1 and 2)
- the homo-purine / homopolymer is similar to the two regions of the DR region of the HBV and the promoter region of the pre-S gene.
- the triple helix is measured by a band electrophoresis band mobility shift assay method. Thermodynamic parameters of DNA formation. TFO B1-B5 can all bind to the two homopolypurine / homopyrimidine sequences of the two pre-S genes of HBV.
- TFO B1-B4 is stronger than B5, and B4 has the strongest effect.
- TF0 B11, B12, and B15 can all bind to the two homopolypurine / homopyrimidine sequences in the DR region of HBV.
- TFO B15 and B12 are stronger than Bl11, and B15 has the strongest effect.
- B5 and B11 only bind to the preS gene of the HBV adr subtype and a homopolypurine / homopyrimidine sequence in the DR region.
- TFO B1-B4 is stronger than B5, indicating that TFO B1-B4 can bind to two of the preS genes of HBV. Similar homopurine / homopyrimidine sequences bind.
- TFO B15 and B12 are stronger than Bll, indicating that TFO B15 and B12 can bind to two similar homopurine / homopyrimidine sequences in the DR region of HBV.
- the Hoogsteen bond or anti-Hoogsteen bond is paired with the target double-stranded DNA.
- the new triple helix-forming oligonucleotide of the present invention binds to the two homologous purine / homopyrimidine sequences of the HBV DR region and the two segments of the preS gene of the HBV adr subtype, the target double-stranded DNA structure has a purine to pyrimidine Turn to Purine.
- this transition reduced the stability of the triple-helix DNA, the stability and specificity of the extended triple-helix-forming oligonucleotide ultimately binding to the target double-stranded DNA were greatly improved, so its inhibitory effect Also stronger. This also proves that the most important factor affecting the stability of the formed triple-helix DNA is the length of the triple-helix-forming oligonucleotide.
- the present invention uses a HBV gene-containing plasmid ( ⁇ 1.2 ⁇ ) to transfect HepG2 cells of liver origin as a research model to study three The role of helix-forming oligonucleotides.
- the plasmid (pl.211) contains a 1.2-fold clone of the HBV (adr subtype) gene, including the full-length HBV genome and the overlapping region from 1403 to 1983. It can express all HBV mRNA. After pl.2II is transfected into HepG2 cells, it can produce Produce complete infectious virus particles.
- HBsAg and HBeAg expression levels can be measured with existing assay kits.
- the inhibitory effect of triple helix-forming oligonucleotides on HBV gene expression can be observed.
- the number of HBV virus DNA in cells can be measured.
- triple helix-forming oligonucleotides such as thiophosphate modification, methyl phosphate modification, 2'-0-methyl modification, 3 , Monophosphorylation modification, etc. to improve its stability.
- the serum is mainly 3, ⁇ 5, exonuclease, it requires a nucleic acid with an OH group at the 3 'end as a substrate, according to the previous research results of the inventor (see invention patent application number 97106495.4, application date 1997 6 Month 28), take 3, monophosphorylated modified oligonucleotide is the best modified derivative, when the 3 'OH group of the oligonucleotide is phosphorylated, it cannot be used as 3, ⁇ 5, exonuclease
- the substrate of the enzyme prolongs its residence time in serum and cells, so it can bind to the target gene more effectively.
- the stability of 3 'phosphorylated oligonucleotides in serum and cells was significantly higher than that of unmodified oligonucleotides, slightly higher than that of phosphorothioate-modified oligonucleotides, and 3' phosphorylated oligonucleotides.
- the ability of the nucleotide to be taken up by cells is higher than that of unmodified oligonucleotides and thiophosphate-modified oligonucleotides.
- the 3 'phosphorylated oligonucleotide does not have non-natural modification components, its metabolic degradation products have no toxic and side effects, so it is more superior and safe, and it is a better modification method.
- the triple-helix-forming oligonucleotides B4 (3T) and B15 (3, P) that have the strongest binding to the target sequence are selected to represent the study of the inhibitory effect of triple-helix-forming oligonucleotides on HBV gene expression and HBV virus reproduction Inhibitory effect.
- the research results show that the triple helix-forming oligonucleotide synthesized by the present invention can inhibit the expression of HBV gene and the replication of HBV virus DNA, thereby inhibiting the reproduction of hepatitis B virus, and therefore, it can be applied to formulating and inhibiting hepatitis B virus and treating hepatitis B Drug.
- HBV is a very closely arranged virus, and its four promoter sequences overlap with the coding region.
- its transcripts that is, the four mRNAs with a length of 3.5kb, 2.4kb, 2.1kb, and 0.8kb, all have a common 3 'end.
- the 3 'end of the 3.5 kb pregene RA is a template for viral reverse transcription into DNA.
- the two target sequences of HBV provided by the present invention are also present at 3.5 kb.
- Pre-gene RNA The DR region is at the 3 'end of the 3.5 kb pregene RNA, and the pre S gene region is in the middle of the 3.5 kb pregene RNA.
- RNA hybrid triple helix AsDR (3'P) 5 'TCT CCT CCC CCA ACT CCT CCCp 3', which forms the oligonucleotide B15 (3) (or B12 (3 'P), B11 (3, P)) —form a target sequence that can act on RNA to form (DNA) 2: RNA hybrid triple helix.
- triple helix-forming oligonucleotides and their modified derivatives with negative-sequence oligonucleotides in the same region can both inhibit the transcription of the HBV gene and form it on the target sequence of the pregene RNA.
- Heterozygous triple helix, which inhibits DNA reverse transcription, can ultimately more effectively inhibit the reproduction of hepatitis B virus.
- the triple helix-forming oligonucleotide and its modified derivative B4 can be used together with AsPS to formulate drugs that inhibit hepatitis B virus and treat hepatitis B, B15 (or Bl l, B12) It can be used together with AsDR to formulate drugs for inhibiting hepatitis B virus and treating hepatitis B.
- Triple helix-forming oligonucleotides and their modified derivatives B4 (3, P) (or B1 (3'P), B2 (3, P), B3 (3'P), B5 (3, P)), can And AsPS (3T)-used in the formulation to inhibit hepatitis B virus And medicines for treating hepatitis B.
- B15 (3, P) (or B11 (3'P), B12 (3, P)) can be used with AsDR (3'P) to formulate drugs that inhibit hepatitis B virus and treat hepatitis B.
- An oligonucleotide and a modified derivative thereof capable of forming a triple-helix DNA structure with two homo-purine / homopyrimidine sequences close to each other are provided.
- the length of the oligonucleotide is increased, and thus the formation thereof can be improved.
- Stability and Specificity of Triple Helix DNA can be formed with two homo-purine / homopyrimidine sequences that are close to each other, thus expanding the application of the anti-gene strategy of triple-helix-forming oligonucleotides.
- a triple helix-forming oligonucleotide is provided, which can inhibit the expression of the hepatitis B virus gene and the reproduction of the hepatitis B virus. This is a substance that directly inhibits the expression of the hepatitis B virus gene and the reproduction of the virus, and provides a new method for the treatment of hepatitis B.
- triple-helix-forming oligonucleotides to inhibit HBV gene expression and virus reproduction is highly specific, without affecting the human cells themselves.
- the triple helix-forming oligonucleotide provided by the present invention can also improve its stability in vivo by adding a phosphate to the 3, terminus. Make their inhibitory effect more obvious. Since the triple helix-forming oligonucleotide of the present invention does not contain non-natural modification components, its degradation products do not have toxic and side effects on the human body.
- RNA hybrid triple helix structure this structure can Suppressing the passage of replicators, inhibiting reverse transcription from viral RNA to DNA, and enhancing the effect of triple helix-forming oligonucleotides against hepatitis B virus.
- Figure 1 The 21 bp double-stranded sequence of the HBV pre-S gene and the designed triple-helix-forming oligonucleotide sequence.
- the numbers in the sequence indicate the position of the underlined bases in the HBV gene.
- the bases in bold italics are Different nature pairs inserted in genes and bases inserted at corresponding positions in TFO.
- Figure 2 25 bp double-stranded sequence of the HBVDR region and the designed triple-helix-forming oligonucleotide sequence.
- the numbers on the sequence indicate the position of the underlined bases in the HBV gene.
- the bold italic bases are the different nature pairs inserted in the gene and the bases inserted at the corresponding positions in the TFO.
- FIG. 3 Gel electrophoresis analysis of the 21-bp double-stranded sequence of HBV pre-S gene and TFOBl-B6.
- A, B, C, D, E, F, G are the results of TFOB1-B6 and control oligonucleotide (NC) binding to double-stranded DNA, respectively.
- S, D, and T next to the picture indicate the positions of single-stranded, double-stranded, and triple-helix DNA, respectively.
- S at the bottom of the photo is a single-stranded DNA control without TFO;
- D is a double-stranded DNA control without TFO;
- the concentrations of TFO used in 1-7 are 1, 2, 3, 4, 5, 6, 7 ⁇
- A, B, C, D, and E are the results of TFOB11-B15 binding to double-stranded DNA, respectively.
- the rest is the same as Figure 3.
- Figure 6 Curve of the relationship between the ratio of triple-helix DNA to double-stranded DNA (b-f) and TFO concentration a when the 25-bp double-stranded sequence of HBVDR region and TFO B11-15 form triple-helix DNA.
- Figure 7 Time curve of HBsAg expression inhibition by triple helix-forming oligonucleotides.
- the triple helix-forming oligonucleotide or control deoxynucleotide concentration was 10 Mmol / L. Without oligonucleotide (X), add B4 (3'P) (4), add B15 (3, P) ( ⁇ ), control deoxynucleotide (A).
- Figure 8 Time curve of HBeAg expression inhibition by triple helix-forming oligonucleotides.
- the triple helix-forming oligonucleotide or control deoxynucleotide concentration was 10 m O l / L.
- the concentration of the triple helix-forming oligonucleotide B15 is 10 ⁇ / L.
- Figure 10 Ding? 0815 (3>) inhibited HBeAg expression in HepG 2 cells pre-transfected with 1 ⁇ ⁇ plasmid.
- the concentration of the triple helix-forming oligonucleotide B15 was 10 ⁇ / L.
- Figure 11 Dot blot detection of HBV DNA in HepG 2 cells.
- TFO B1-B4 is used at the corresponding position of the pre-S gene fragment cytosine, respectively, using thymine, cytosine, adenine or guanine to determine which base can be better paired with GC to form a more stable TFO B6 is the same as the 11 nucleotides at the 5 'end of TFO B1-B4, which are all purine nucleotides, and can be the same as the pre-S gene.
- the fragment forms a triple helix DNA, and the 8 nucleotides at the 3 ′ end of TFO B6 are all T, which cannot form a triple helix DNA with the pre-S gene fragment.
- TFO Bl-B4 and TFO B6 By comparing the stability of TFO Bl-B4 and TFO B6 with the pre-S gene fragment to form a triple helix DNA, we can understand whether the 3, TFO B1-B4 end can form a triple-helix DNA with the pre-S gene fragment, so that it is known that In the double-stranded DNA / homopolypyrimidine sequence, if a base of a different nature is inserted, whether triple-helix DNA formation is interrupted or not, NC is the control oligonucleotide.
- the corresponding positions of TT in the fragment are AA, GG, CC or TT, respectively, to determine which base can be better paired with two ATs to form a more stable tribasic body, so that the triple helix DNA it forms has High stability;
- TFO B1-B5 and TFO B11-B15 oligonucleotides were modified by 3'monophosphorylation.
- Oligonucleotides were synthesized on a DNA synthesizer (ABI391-EP) manufactured by PE company using the phosphite amide triester method, and purified by polyacrylamide gel electrophoresis.
- a 0.2 ⁇ mol solid phase column (product of Glen Research) was used to synthesize using a 0.2 ⁇ mol synthesis sequence on an ABI 391EP DNA synthesizer.
- a 0.2 ⁇ ⁇ 3 'phosphate solid-phase column (3'-phosphate CPG Glen Research company product, full name 2- [2- (4,4, -dimethyltriphenylmethoxy) ethanesulfonyl] ethyl-butane
- Diacyl long-chain fluorenylamine-microporous glass beads (2- [2- (4,4'-Dimethoxytrityloxy) ethylsulfomyl] ethyl-succinoyl long chain alkylamino-CPG) were synthesized using the same synthetic sequence.
- oligonucleotide fragment 1 Take 50 pmol of oligonucleotide fragment 1 (or ⁇ ), add 50 ⁇ [ ⁇ - 32 ⁇ ] ⁇ , 2 u ⁇ 4 polynucleotide kinase, ⁇ ⁇ ⁇ ⁇ 4 Forward Buffer, add double distilled water to 10 ⁇ Incubate at 37 ° C for 1 hour, take 4 ⁇ 1 in an ice bath, add another 6 ⁇ 1 to 50 pmol oligonucleotide fragment ⁇ (or IV), incubate at 100 ° C for 5 minutes, slowly anneal, and then walk 15% non-denaturing polymer.
- TFO + double-stranded DNA triple-helix DNA, assuming that the initial concentrations of the triple-helix-forming oligonucleotide and the double-stranded DNA are a and b, respectively.
- the concentration of the helical DNA is f.
- the concentrations of the triple-helix-forming oligonucleotide and the double-stranded DNA after equilibrium are (af) and (bf), respectively.
- Ka ⁇ When a »f, a-f « a, then,
- 2-2-1 TFO and Hepatitis B virus preS gene are similar to two homopurine / homopyrimidine sequences 2-2-1-1 TFO and labeled hepatitis B virus preS double-stranded gene segment to form triple helix DNA and coagulate Gel block analysis
- Oligonucleotide fragment I was renatured after fragmentation at the 5 and 32 P ends, and purified by polyacrylamide gel electrophoresis to obtain a 32 P-labeled oligonucleotide single-strand and a 32 P-labeled hepatitis B virus preS gene. Double-stranded fragment.
- a synthetic oligonucleotide and a 32 P-labeled double-stranded fragment of the hepatitis B virus preS gene were used for gel retardation analysis.
- the oligonucleotide designed and synthesized in the present invention, in addition to the control oligonucleotide NC, has other oligonucleotides.
- the nucleotides Bl, B2, B3, B4, B5, and B6 can all form triple helix DNA with the hepatitis B virus gene fragment, as shown in FIG.
- Tri-helix DNA was formed, and the 8 poly T bases at its 3 and ends could not be paired with the target double-stranded DNA.
- the results are shown in Figure 3, Figure 4, and Table 1.
- TFO B6 and the HBV preS gene fragment formed a triple-helix.
- the amount of DNA and its Ka value are significantly less than those of oligonucleotides B1-B4, and are similar to B5, indicating that both the 5 'and 3' ends of oligonucleotides B1-B4 can interact with the target double-stranded DNA Combine to form triple helix DNA.
- TFO Bl-B4 has 5 polynucleosides of the same sequence at the 5 terminal, 11 nucleotides and 3 3 terminal nucleotides, except that the 12th position is D, C, A or G, respectively. They are different from the stability of the triple-helix DNA formed by the pre-S segment of the hepatitis B virus gene. It can be understood that the corresponding position in the third helical oligonucleotide of the target double-stranded DNA homopolypurine strand when inserted into a single cytosine Which base to use to pair it with.
- the results show that the combination of TFO B4 and the hepatitis B virus gene fragment to form triple-helix DNA is the most stable. Therefore, if a C base is inserted in the middle of the homopolypurine strand of the target double-stranded DNA, it is more stable to form a GGC tribase by applying a G base to the homopolypurine TFO.
- TFO B5 has only 11 nucleotides and TFO B1-B4 has 17 nucleotides.
- oligonucleotide B5 can form triple-helix DNA with the target sequence, it is less stable than TFO B1-B4. Therefore, relative to the same target double-stranded DNA sequence, the longer the TFO, the more stable the triple helix DNA they form, and the length of the oligonucleotide is the main factor that determines the stability of the triple helix DNA.
- Oligonucleotide fragment m was renatured with fragment IV after being labeled at 5, terminal 32 P, and purified by non-denaturing polyacrylamide gel electrophoresis to obtain 32 P-labeled oligonucleotide single-strand and 32 P-labeled hepatitis B virus DR Area Domain double-stranded fragment.
- the synthetic oligonucleotide and the 32 P-labeled double-stranded fragment of the hepatitis B virus DR region were used for gel block analysis.
- the oligonucleotides Bl, B12, B13, B14, and B15 designed and synthesized by the present invention can be used with the hepatitis B virus.
- the DR segment of the gene forms a triple helix DNA, as shown in Figure 5.
- end 8 bp of the 21 ′ bp gene fragment from 1734 to 1754 of the DR region of hepatitis B virus are homopolypurines / homopolypyrimidines Sequence, two AT base pairs are inserted at positions 1745 and 1746 in the middle.
- the 11 homopolypurine bases of TFO B11 can bind to the first homopolypurine / homopyrimidine sequence at the 5 'end of the target DNA.
- the 11' 5 'end of TFO B12-B15 and 8 at the 3' end The oligopurine nucleotides of the nucleotides can bind to two homopolypurine / homopyrimidine sequences of the target double-stranded DNA, respectively, and two nucleotides AA, GG, CC and TT are inserted in the middle. Based on the differences between the stability of the triple-helix DNA and the hepatitis B virus gene fragments, the corresponding position in the third helical oligonucleotide of the homo-purine strand of the target double-stranded DNA can be understood. Which base should be used to pair it with.
- Nucleotides B11-B15 can be combined with target double-stranded DNA to form triple helix DNA, but their stability is different.
- the stability of TFO B13 combined with target DNA to form triple helix DNA and the stability of B11 combined with target DNA to form triple helix DNA are similar, indicating that only 11 bases at the 5 'end of TFO B13 participate in the formation of triple helix DNA, while TFO B15
- the stability of B12 and target DNA forming triple helix DNA is significantly higher than the stability of B11 and target DNA forming triple helix DNA, indicating that TFO B15 and B12 have 5 nucleotides, 11 ends and 3, 8 nucleosides.
- TFO B14 has only 11 nucleotides and TFO B15 has 21 nucleotides. Both of them can form triple-helix DNA with the target sequence.
- TFO B15 and target DNA to form triple-helix DNA is significantly higher than that of TFO B11.
- TFO B15 and the target DNA in the DR region Comparing the stability of TFO B15 and the target DNA in the DR region to form a triple helix DN A compared to the stability of TFO B4 and the DNA in the pre S region to form a triple helix DNA, TFO B15 and the target DNA in the DR region form a triple helix The stability of DNA is higher than that of TFO B4 and the target DNA of the pre-S region to form a triple helix DNA. B15 is longer than B4, which also indicates that the longer the TFO, the more stable the triple helix DNA they form.
- Example 3 Effect of Triple Helix-forming Oligonucleotides B4 (3, P) and B15 (3, P) on Hepatitis B Virus Gene Expression
- HepG 2 cells were cultured in 1 x DMEM (containing 10% fetal bovine serum) at 37 ° C, 5% C0 2. One day before transfection, the cells were seeded in 96-well plates and cultured overnight. 2 hours before transfection Replace with fresh medium.
- 1 x DMEM containing 10% fetal bovine serum
- Preparation solution A 0.8 ⁇ ⁇ plasmid pl.2II (by Wang, Shanghai Institute of Biochemistry, Chinese Academy of Sciences (Provided by Professor Yuan), and different concentrations of deoxynucleotides TFO B4 (3'P) or TFO B15 (3'P), deoxynucleotides are 0, 40, 80, 120, 160, 200 pmoL when When the transfection volume is 20 ⁇ , the final concentration of deoxynucleotide is 0, 2, 4, 6, 8, 10 ⁇ / L), add DMEM to 10 ⁇ 1, and mix; Solution B: 0.3 ⁇ lipofectin, 9.7 ⁇ DMEM, mix well and leave at room temperature for 30 minutes. Solution A and solution B were mixed and left at room temperature for 30 minutes.
- Inhibition rate A M2 X 1 0t without uridine
- HepG2 cells were cultured in 12-well plates, and each well was transfected with TFO B4 (3, P) or TFO B15 (3, P) with HB V gene plasmid pi.211 10 ⁇ g and 10 pmol / L, each sample Repeat 3 times, and every Take 12 ⁇ ⁇ culture medium for 12 hours, of which 100 ⁇ culture medium is used to determine HBeAg, and another 100 ⁇ culture medium is used to determine HBsAg. The average value is calculated in three replicates. The results are shown in Figures 7 and 8.
- HBeAg and HBsAg began to be expressed on the second day, and the expression gradually increased with time.
- 10 ⁇ / L TFO B4 (3'P) or TFO B15 (3T) were co-transfected with HBV plasmid DNA, the expressions of HBeAg and HBsAg were significantly lower than without TFO, especially when TFO B15 (3'P ), The inhibition of HBeAg and HBsAg expression was particularly significant, and the expression of HBeAg and HBsAg increased slowly.
- HBeAg and HBsAg are significantly smaller than the inhibitory effect of triple helix-forming oligonucleotides on the expression of HBeAg and HBsAg.
- HepG2 cells were cultured in a 12-well plate, and each well was transfected with the plasmid HBV gene pl.2II, respectively. Then, was added to the cell culture medium at a final concentration of 10 0101? 0 815 (3), repeat 3 times for each sample, and take 200 ⁇ culture medium every 10 hours, of which 100 ⁇ culture medium is used to determine HBeAg, and another 100 ⁇ culture medium is used to determine HBsAg. The results are shown in Figures 9 and 10. After the HBV gene was transfected into HepG 2 cells, when no triple helix was added to form the oligonucleotide, HBeAg and HBsAg began to be expressed on the second day, and the expression gradually increased with time.
- HepG 2 cells were cultured in 1 x DMEM (containing 10% fetal bovine serum) culture medium, at 37 ° C, 5% C0 2 culture day, cells were seeded in 12-well plates, cultured overnight before transfection, transfection before 5 Change the fresh culture medium every hour.
- Preparation solution A plasmid ⁇ 1.2 ⁇ 10 ⁇ ⁇
- the final concentration of the triple helix-forming oligonucleotide in the transfection mixture was 10 ⁇ / L
- serum-free DMEM was added to 110 ⁇ , and mixed
- solution B 6 ⁇ lipofectin, 114 ⁇ serum-free DMEM, mix well and leave at room temperature for 30 minutes.
- 10 ⁇ / L triple helix-forming oligos were treated for 5 days, then the cells were digested with trypsin, and the cells repeated three times were combined, centrifuged at 3000 g for 2 minutes at 4 ° C, and the cells were collected in 1.5 ml Eppendorf tubes and 1 ml of TRIzol reagent was added Mix well, let stand for 5 minutes at room temperature, add 0.2 ml of chloroform, shake for 15 seconds, place at room temperature for 2-3 minutes, centrifuge at 1200g for 15 minutes at 4 ° C, transfer the aqueous phase to another 1.5 ml Eppendorf tube, For total RNA extraction.
- Plasmid ⁇ 1.2 ⁇ was digested with BamHI and electrophoresed to purify a complete linear HBV DNA with a length of 3.2 kb.
- HBV DNA probes were prepared using a random hexanucleotide primer method (see: Molecular Cloning Experiment Guide, Second Edition, J By Sambrook &, EF Fritsch and T. Maniatis, translated by Jin Dongyan, etc. Science Press, 1986, 502-504).
- a denatured DNA sample was spotted onto a nylon membrane with a suction filter sampler, cross-linked to the membrane with UV, and then hybridized with a 32 P-labeled HBV DNA probe.
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Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/529,812 US6682930B1 (en) | 1997-10-21 | 1998-10-19 | Triplex forming oligonucleotides and their use in anti-HBV |
| JP2000516982A JP2002511384A (ja) | 1997-10-21 | 1998-10-19 | 新規な三重らせん形成性オリゴヌクレオチドおよび抗−hbvにおけるそれらの使用 |
| AU95287/98A AU9528798A (en) | 1997-10-21 | 1998-10-19 | New triplex forming oligonucleotides and their use in anti-hbv |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97106667A CN1215058A (zh) | 1997-10-21 | 1997-10-21 | 新的三链形成寡核苷酸结构及其在抗乙肝病毒中的应用 |
| CN97106667.1 | 1997-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999020641A1 true WO1999020641A1 (en) | 1999-04-29 |
Family
ID=5168886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN1998/000248 Ceased WO1999020641A1 (en) | 1997-10-21 | 1998-10-19 | New triplex forming oligonucleotides and their use in anti-hbv |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6682930B1 (zh) |
| JP (1) | JP2002511384A (zh) |
| CN (2) | CN1215058A (zh) |
| AU (1) | AU9528798A (zh) |
| WO (1) | WO1999020641A1 (zh) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004078181A1 (en) * | 2003-03-05 | 2004-09-16 | Capital Biochip Company, Ltd. | Rna interference based methods and compositions for inhibiting hbv gene expression |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030104973A1 (en) * | 1997-08-21 | 2003-06-05 | Quark Biotech, Inc. | Hypoxia-regulated genes |
| US7973156B2 (en) * | 1997-08-21 | 2011-07-05 | Quark Pharmaceuticals Inc. | Hypoxia-regulated genes |
| CN114507663A (zh) * | 2020-11-16 | 2022-05-17 | 浙江柏拉阿图医药科技有限公司 | 寡核苷酸及其在抗乙型肝炎和丁型肝炎病毒中的应用 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995019433A2 (en) * | 1994-01-12 | 1995-07-20 | Targetech, Inc. | Anti-hepatitis b poly- and oligonucleotides |
| CN1122138A (zh) * | 1993-01-21 | 1996-05-08 | 海布里顿公司 | 折回三螺旋形成寡核苷酸 |
| WO1996039502A1 (en) * | 1995-06-06 | 1996-12-12 | Hybridon Inc. | Oligonucleotides specific for hepatitis b virus |
| WO1996040710A1 (en) * | 1995-06-07 | 1996-12-19 | Hybridon, Inc. | Triplex-forming antisense oligonucleotides having abasic linkers targeting nucleic acids comprising mixed sequences of purines and pyrimidines |
| WO1997003211A1 (en) * | 1995-07-13 | 1997-01-30 | Isis Pharmaceuticals, Inc. | Antisense inhibition of hepatitis b virus replication |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5556956A (en) | 1993-11-04 | 1996-09-17 | Board Of Regents, The University Of Texas System | Methods and compositions relating to the androgen receptor gene and uses thereof |
-
1997
- 1997-10-21 CN CN97106667A patent/CN1215058A/zh active Pending
-
1998
- 1998-10-19 US US09/529,812 patent/US6682930B1/en not_active Expired - Fee Related
- 1998-10-19 CN CNB988104474A patent/CN1176098C/zh not_active Expired - Fee Related
- 1998-10-19 JP JP2000516982A patent/JP2002511384A/ja active Pending
- 1998-10-19 WO PCT/CN1998/000248 patent/WO1999020641A1/zh not_active Ceased
- 1998-10-19 AU AU95287/98A patent/AU9528798A/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122138A (zh) * | 1993-01-21 | 1996-05-08 | 海布里顿公司 | 折回三螺旋形成寡核苷酸 |
| WO1995019433A2 (en) * | 1994-01-12 | 1995-07-20 | Targetech, Inc. | Anti-hepatitis b poly- and oligonucleotides |
| WO1996039502A1 (en) * | 1995-06-06 | 1996-12-12 | Hybridon Inc. | Oligonucleotides specific for hepatitis b virus |
| WO1996040710A1 (en) * | 1995-06-07 | 1996-12-19 | Hybridon, Inc. | Triplex-forming antisense oligonucleotides having abasic linkers targeting nucleic acids comprising mixed sequences of purines and pyrimidines |
| WO1997003211A1 (en) * | 1995-07-13 | 1997-01-30 | Isis Pharmaceuticals, Inc. | Antisense inhibition of hepatitis b virus replication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004078181A1 (en) * | 2003-03-05 | 2004-09-16 | Capital Biochip Company, Ltd. | Rna interference based methods and compositions for inhibiting hbv gene expression |
Also Published As
| Publication number | Publication date |
|---|---|
| US6682930B1 (en) | 2004-01-27 |
| JP2002511384A (ja) | 2002-04-16 |
| CN1176098C (zh) | 2004-11-17 |
| AU9528798A (en) | 1999-05-10 |
| CN1276794A (zh) | 2000-12-13 |
| CN1215058A (zh) | 1999-04-28 |
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