EP4313071A1 - Oligonucléotides anti-sens pour leur utilisation dans un traitement anticancéreux - Google Patents
Oligonucléotides anti-sens pour leur utilisation dans un traitement anticancéreuxInfo
- Publication number
- EP4313071A1 EP4313071A1 EP22714905.1A EP22714905A EP4313071A1 EP 4313071 A1 EP4313071 A1 EP 4313071A1 EP 22714905 A EP22714905 A EP 22714905A EP 4313071 A1 EP4313071 A1 EP 4313071A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cells
- antisense oligonucleotide
- treatment
- aso
- seq
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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Classifications
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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
- C12N15/11—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
- C12N15/1137—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 enzymes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/16—Amides, e.g. hydroxamic acids
- A61K31/165—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide
- A61K31/166—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide having the carbon of a carboxamide group directly attached to the aromatic ring, e.g. procainamide, procarbazine, metoclopramide, labetalol
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/16—Amides, e.g. hydroxamic acids
- A61K31/17—Amides, e.g. hydroxamic acids having the group >N—C(O)—N< or >N—C(S)—N<, e.g. urea, thiourea, carmustine
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- A—HUMAN NECESSITIES
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- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/16—Amides, e.g. hydroxamic acids
- A61K31/17—Amides, e.g. hydroxamic acids having the group >N—C(O)—N< or >N—C(S)—N<, e.g. urea, thiourea, carmustine
- A61K31/175—Amides, e.g. hydroxamic acids having the group >N—C(O)—N< or >N—C(S)—N<, e.g. urea, thiourea, carmustine having the group, >N—C(O)—N=N— or, e.g. carbonohydrazides, carbazones, semicarbazides, semicarbazones; Thioanalogues thereof
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- A—HUMAN NECESSITIES
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- A61K31/28—Compounds containing heavy metals
- A61K31/282—Platinum compounds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
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- A—HUMAN NECESSITIES
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- A61K31/00—Medicinal preparations containing organic active ingredients
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- A61K31/555—Heterocyclic compounds containing heavy metals, e.g. hemin, hematin, melarsoprol
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/70—Carbohydrates; Sugars; Derivatives thereof
- A61K31/7088—Compounds having three or more nucleosides or nucleotides
- A61K31/711—Natural deoxyribonucleic acids, i.e. containing only 2'-deoxyriboses attached to adenine, guanine, cytosine or thymine and having 3'-5' phosphodiester links
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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
- C12N2310/00—Structure or type of the nucleic acid
- C12N2310/10—Type of nucleic acid
- C12N2310/11—Antisense
Definitions
- Antisense oligonucleotides for their use in an anti-cancer treatment
- the invention relates to antisense oligonucleotides for their use in an anticancer treatment. It falls within the field of therapeutic applications and more particularly concerns the use of antisense oligonucleotides to sensitize glioma cells to anti-cancer treatments.
- GBM Glioblastoma multiforme
- type IV astrocytoma is a rare brain tumor (4 cases per 100,000 inhabitants in France each year), with rapid growth and whose vital prognosis is poor since only 2% of patients survive the more than 2 years after diagnosis. Tumors have a glial origin, so they are called gliomas. It has been shown more recently that deregulated subventricular zone stem cells could be the cause of GBM (“Human glioblastoma arises from subventricular zone cells with low-level driver mutations” Lee et al. 2018). The environmental and molecular factors at the origin of these deregulations remain to be determined. Tumors are made up of multiple more or less differentiated cell types. Among these cells, rare cancer stem cells are responsible for resistance to cancer treatments and tumor recurrence.
- the first phase of treatment consists of surgical excision.
- the GBM cells proliferate rapidly and invade the cerebral parenchyma and it is therefore impossible to remove the whole tumor and in particular the stem cells.
- Repeated cycles of radiotherapy and chemotherapy with oral temozolomide (TMZ) for 7 days every 28 days can slow tumor regrowth.
- TMZ is a DNA alkylating agent that adds a methyl group at the N-7 or 0-6 position of guanine and at the N-3 position of adenine.
- TMZ is a DNA alkylating agent that adds a methyl group at the N-7 or 0-6 position of guanine and at the N-3 position of adenine.
- MGMT 06-methylguanine DNA methyltransferase
- the present invention aims to overcome the aforementioned drawbacks by providing an antisense oligonucleotide having the ability to reduce the level of expression of the huntingtin protein in glioma cells, for use in sensitizing said cells to cancer treatment.
- the present invention further relates to an antisense oligonucleotide having the ability to decrease the level of expression of the protein huntingtin and of the protein 6-O-methylguanine DNA methyltransferase (MGMT) in glioma cells, for its use in sensitizing said cells to an anti-cancer treatment.
- MGMT protein 6-O-methylguanine DNA methyltransferase
- the huntingtin protein is a pleiotropic protein of 350 kDa. This protein is mainly studied in its mutant form, i.e. presenting an expansion of more than 36 CAG triplets in exon 1 of its gene sequence because the mutated gene (huntingtin gene with the abnormal expansion of CAG triplets) encoding the HTT protein causes Huntington's disease, a fatal neurodegenerative disease. Wild-type HTT maintains the stem state of cells. Indeed, the decrease in HTT levels in stem/progenitor cells of different origins leads to a depletion of the reservoir of these cells which will tend to differentiate early (Godin et al. 2010, Elias et al. 2014, Lopes et al.
- HTT has also been shown to participate in the epithelial-mesenchymal transition, and in its absence, breast cancer cells are more metastatic and non-cancerous cells lose their polarity (Elias et al. 2015, Thion et al. 2015).
- Antisense oligonucleotides also called ASO from the Anglo-Saxon terminology “Antisense Oligonucleotides” are short synthetic DNA sequences (approximately 20 bases) which target the messenger RNA (mRNA) of interest according to the principle of Crick and Watson of nitrogenous base pairing. The mRNA is then degraded by RNAse H and is therefore not translated into protein.
- ASOs present phosphothiorate bonds and modifications of nitrogenous bases with in particular the addition of 2'-0-methoxyethyl (MOE) groups on the nucleotides of the 3' and 5' ends making them resistant to nucleases and soluble in water.
- MOE 2'-0-methoxyethyl
- the antisense oligonucleotide sequences used in the present invention to reduce HTT levels in glioma cells are sequences available in the literature (Kordasiewicz et al. 2012, “In Vivo Evaluation of Candidate Allele-specific Mutant Huntingtin Gene Silencing Antisense Oligonucleotides” Southwell et al. 2014).
- ASO of sequence SEQ ID NO: 1 also called in the description of the present application antisense oligonucleotides RG6042.
- HTT levels are decreased in the cerebrospinal fluid of patients with Huntington's disease (Tabrizi et al. 2019).
- the 6-O-methylguanine DNA methyltransferase (MGMT) protein is a DNA repair enzyme. It is found expressed in different tissues of the body (low tissue specificity). In the brain, it is expressed by endothelial cells and glial cells but not by neurons.
- MGMT MGMT-induced MGMT
- brain tumours following repeated cycles of radiotherapy/chemotherapy, certain cells re-expressing MGMT emerge, “take over” the other cells of the tumor mass which are partly eliminated by the treatment. These resistant cells are the cause of tumor recurrence.
- antisense oligonucleotides having the ability to reduce the level of expression of the huntingtin protein and of the 6-O-methylguanine DNA methyltransferase (MGMT) protein in glioma cells according to the invention is therefore particularly advantageous in order to avoid the phenomenon of tumor recurrence.
- MGMT 6-O-methylguanine DNA methyltransferase
- the invention also responds to the following characteristics, implemented separately or in each of their technically effective combinations.
- the antisense oligonucleotide comprises between 12 and 35 nucleic bases.
- the antisense oligonucleotide is chosen from antisense oligonucleotides of sequence SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3 and SEQ ID NO: 4.
- the antisense oligonucleotide is chosen from antisense oligonucleotides having a sequence identical to at least 50%, preferably at least 60%, more preferably at least 70%, of preferably at least 80%, preferably at least 90%, preferably at least 92%, more preferably at least 95%, preferably at least 96%, preferably at least 97%, preferably at least 98%, of preferably at least 99%, with a sequence chosen from SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3 and SEQ ID NO: 4.
- the anticancer treatment to which the glioma cells are sensitized is a treatment which causes damage to the DNA of said cells.
- the anticancer treatment to which the glioma cells are sensitized is treatment with a DNA alkylating agent.
- the alkylating agent is preferably chosen from temozolomide (TMZ), lomustine (CCNU), carmustine (BCNU), procarbazine and carboplatin.
- the anticancer treatment to which the glioma cells are sensitized is a treatment with temozolomide (TMZ)
- the glioma cells are preferably sensitized so that the lethal dose 50 (LD50) at TMZ is reduced by at least 30% but preferably by at least 40%.
- the lethal dose 50 (LD50) designates the concentration of TMZ for which cell viability is reduced by 50% relative to the control condition (without use of antisense oligonucleotides which are the subject of the present invention).
- the anticancer treatment to which the glioma cells are sensitized is a treatment using radiation.
- the invention relates to a pharmaceutical composition
- a pharmaceutical composition comprising at least one antisense oligonucleotide which is the subject of the present invention, or comprising a salt, an ester, a salt of such an ester or a pharmaceutically acceptable prodrug thereof.
- ci and a pharmaceutically acceptable carrier or diluent, for use in sensitizing said cells to anti-cancer treatment.
- a "pharmaceutical composition comprising an antisense oligonucleotide” refers to a composition comprising an antisense oligonucleotide targeting huntingtin in a pharmaceutically acceptable diluent.
- Pharmaceutically acceptable diluents are well known to those skilled in the art. The selection of a pharmaceutically acceptable diluent or carrier is based on a number of factors, including but not limited to the solubility of the compound and route of administration. These considerations are well understood by those skilled in the art.
- a "pharmaceutical carrier” or excipient can be a pharmaceutically acceptable solvent, a suspending agent or any other pharmacologically inert vehicle for delivering one or more nucleic acids to an animal and are known in the technical field.
- the excipient can be liquid or solid and is chosen, taking into account the intended mode of administration, so as to obtain the volume, consistency, etc. desired when combined with a nucleic acid and the other components of a given pharmaceutical composition.
- pharmaceutically acceptable salt designates the physiologically and pharmaceutically acceptable salts of the compounds of the invention: that is to say the salts which retain the desired biological activity of the parent compound and do not confer on it adverse toxicological effects.
- Sodium salts of antisense oligonucleotides are useful and are well accepted for therapeutic administration to humans.
- prodrug herein refers to a therapeutic agent which is prepared in an inactive or less active form which is converted to an active form (i.e. a drug) in the body or cells. of it by the action of endogenous enzymes or other chemical substances and/or conditions.
- the present invention relates to the antisense oligonucleotide or the composition comprising at least one antisense oligonucleotide according to the present invention for its use in the treatment of a brain tumor.
- the present invention relates to the antisense oligonucleotide or the composition comprising at least one antisense oligonucleotide according to the present invention for its use in the treatment of glioblastoma multiforme or type IV astrocytoma.
- FIG. 1 illustrates in A the results of the western blot carried out from cells of the U251 cell line having been transfected with the antisense oligonucleotide (ASO) RG6042 (SEQ ID NO: 1), with the ASO Scr (for "scramble” in Anglo-Saxon terminology and “jamming” in French terminology) or treated with lipofectamine alone (Ctrl for control), and, in B, the quantification of HTT protein levels obtained in western blot after 4 repetitions of the experiment presented in (A);
- ASO antisense oligonucleotide
- FIG. 2 illustrates in A the result of the western blot carried out from cells of the U87 cell line having been transfected with ASO RG6042, with ASO Scr or treated with lipofectamine alone (Ctrl), and, in B, the quantification of the protein levels of FITT obtained in western blot after at least 3 repetitions of the experiment presented in (A);
- FIG. 3 illustrates in A the result of the western blot carried out from cells of the T98G cell line having been transfected with ASO RG6042, with ASO Scr or treated with lipofectamine alone (Ctrl), and, in B, the quantification of the protein levels of HTT obtained in western blot after 5 repetitions of the experiment presented in (A);
- FIG. 4 illustrates in A the result of the western blot carried out from cells of the T98G cell line having been transfected with ASO RG6042, with ASO Scr or treated with lipofectamine alone (Ctrl), and, in B, the quantification of the protein levels of MGMT obtained in western blot after 4 repetitions of the experiment presented in (A);
- Figure 5 illustrates the result of the western blot carried out from cells of the T98G cell line having been transfected with ASO RG6042, with ASO PH1, with ASO PH2, with ASO PH3, or with the ASO Scr;
- FIG. 6 Figure 6 illustrates the quantification of the protein levels of HTT in A and of MGMT in B, obtained by western blot after at least four repetitions of the experiment presented in Figure 5;
- FIG. 7 illustrates a graph of HTT mRNA expression in A quantified by qPCR, and a graph of MGMT mRNA expression in B quantified by qPCR, in T98G cells treated with l 'ASO RG6042;
- FIG. 8 illustrates at A a curve showing the percentage of living cells of the U251 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl) as a function of the dose of TMZ received and, at B, the concentration of TMZ measured at the LD50 for cells of the U251 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl);
- FIG. 9 illustrates at A a curve showing the percentage of living cells of the U87 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl) as a function of the dose of TMZ received and, at B, the concentration of TMZ measured at the LD50 for cells of the U87 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl);
- Figure 10 illustrates at A a curve showing the percentage of living cells of the T98G line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl) as a function of the dose of TMZ received and, at B, the concentration of TMZ measured at the LD50 for cells of the T98G line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl);
- FIG. 11 illustrates at A a curve showing the percentage of living cells of the U251 line transfected with ASO RG6042 or Scr as a function of the dose of Lomustine received and, at B, the mean of the concentrations of Lomustine measured at the LD50 in 4 different MTT tests for cells of line U251 transfected with ASO RG6042 or Scr;
- Figure 12 illustrates at A a curve showing the percentage of live cells of the T98G line transfected with ASO RG6042 or Scr as a function of the dose of Lomustine received and, at B, the mean of the concentrations of Lomustine measured at the LD50 in 4 different MTT assays for T98G cell line transfected with ASO RG6042 or Scr.
- glioma cells transfected with antisense oligonucleotides The U87, T98G and U251 glioma cell lines are cultured in DMEM medium ("Dulbecco/Vogt modified Eagle's minimal essential medium" in English terminology and "Eagle's minimum essential medium modified by Dulbecco/Vogt” in English terminology). French) supplemented with 10% fetal calf serum and 1% penicillin and streptomycin.
- ASO antisense oligonucleotide
- the ASO Scr (for "scramble” in Anglo-Saxon terminology and “jamming” in French terminology) is an ASO serving as a control whose sequence SEQ ID NO: 5 is ⁇ A * CATG * > A * C * C * G * C * A * C * T * C * A * ⁇ CTAT * A> where * is a phosphorothioate bond and the bases between the signs ⁇ and > are 2'-O-methoxyethyl RNA.
- the cells are then used either in a susceptibility test to temozolomide (TMZ), or in a susceptibility test to the alkylating agent Lomustine, or in huntingtin (HTT) and 6- protein level expression tests.
- TMZ temozolomide
- HTT huntingtin
- 6- protein level expression tests O-methylguanine DNA methyltransferase (MGMT).
- the cells are rinsed with phosphate-buffered saline (PBS) and then lysed in RIPA-type lysis buffer supplemented with protease and phosphatase inhibitors.
- PBS phosphate-buffered saline
- the proteins solubilized in the buffer are harvested after centrifugation, denatured in Laemmli loading buffer and deposited on polyacrylamide gel. After migration, the proteins are transferred onto a polyvinylidine difluoride (PVDF) membrane.
- PVDF polyvinylidine difluoride
- the HTT protein is revealed by incubation with the D7F7 antibody (#5656, from the Cell signaling technology ® brand). Vinculin is used as a load control.
- Figure 1 illustrates in A the results of the western blot carried out from cells of the U251 cell line having been transfected with ASO RG6042, with ASO Scr or simply treated with lipofectamine alone (Ctrl for control), and, in B, the quantification of HTT protein levels obtained by western blot after 4 repetitions of the experiment presented in A.
- FIG. 2 illustrates at A the result of the western blot produced from cells of the U87 cell line having been transfected with ASO RG6042, with ASO Scr or treated with lipofectamine alone (Ctrl), and, in B, the quantification of HTT protein levels obtained by western blot after at least 3 repetitions of the experiment presented in A.
- FIG. 3 illustrates at A the result of the western blot produced from cells of the T98G cell line having been transfected with ASO RG6042, with ASO Scr or treated with lipofectamine alone (Ctrl), and, in B, the quantification of HTT protein levels obtained by western blot after 5 repetitions of the experiment presented in A.
- the protocol is the same as for the previously cited test of the level of expression of the HTT protein with the only change being the use of anti-MGMT antibodies (#2739, from the Cell signaling technology ® brand) in incubation for reveal the MGMT protein. Vinculin is also used here as a load control.
- FIG. 4 illustrates at A the result of the western blot produced from cells of the T98G cell line having been transfected with ASO RG6042, with ASO Scr or treated with lipofectamine alone (Ctrl) and, in B, quantification of MGMT protein levels obtained by western blot after at least 4 repetitions of the experiment presented in A.
- T98G cells transfected with ASO RG6042, or ASO PH1, or ASO PH2 or ASO PH3, or ASO Scr are harvested for testing the level of expression of HTT proteins and MGMT.
- the protocol is the same as for the previously cited tests for the level of expression of the HTT protein and the level of expression of the MGMT protein.
- Vinculin is also used here as a load control.
- Figure 5 illustrates the result of the western blot produced from cells of the T98G cell line having been transfected with ASO RG6042, with ASO PH1, with ASO PH2, with ASO PH3, or with the ASO Scr.
- FIG. 6 illustrates the quantification of the protein levels of HTT in A and of MGMT in B, obtained by western blot after at least four repetitions of the experiment presented in FIG. 5.
- the statistics were carried out using the Kruskal-wallis test followed by Dunn's multiple comparison test, error bars, SEM, * p ⁇ 0.05, ** p ⁇ 0.001.
- FIG. 7 illustrates the expression of the mRNA of HTT in A and of MGMT in B quantified by qPCR. Statistics were established using Mann Whitney's t-test, error bars, SEM, * p ⁇ 0.05, **** p ⁇ 0.0001.
- TTZ Temozolomide
- the cells transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl for control) are harvested for the TMZ sensitivity test.
- the TMZ was prepared in the form of a stock solution of 50 mM in 33.3 mM of citrate monohydrate. The solution is sonicated, filtered and frozen at -20 ° C until further use (Nygren, H., and Eksborg, S. (2012), “Stability of temozolomide in solutions aimed for oral treatment prepared from a commercially available powder for infusion”, Pharm Methods 3, 1-3). The cells are distributed in 96-well culture dishes at the rate of 200 cells per well for the U251 and T98G lines and 100 cells per well for the U87 line. The cells are left developing for 24 hours.
- the cells are then treated for 48 hours with increasing doses of TMZ at the rate of 10 mM to 110 mM for the U87 and U251 lines and from 100 mM to 1500 mM for the T98G line. Each dilution is tested in triplicate.
- the control condition consists of cells treated with complete culture medium. Blank wells contain only complete culture medium.
- the medium containing the TMZ is removed and replaced with fresh complete culture medium in which the cells are left to incubate for 72 hours.
- An MTT test (known live cell count test) is then set up in order to evaluate the cell survival in the different wells.
- the yellow probe of MTT 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide, is then added at a working concentration of 0.5 mg. ml 1 to each well.
- the wells are incubated for 4 hours in a humidified incubator with 95% air and 5% CO2 at 37°C.
- the insoluble purple formazan resulting from the reduction of the MTT probe in living cells is solubilized by adding a solubilizing solution (10% sodium dodecyl sulfate (SDS) and 0.01% hydrogen chloride (HCl) in water) overnight at 37 ° C.
- SDS sodium dodecyl sulfate
- HCl hydrogen chloride
- the optical density (OD) of the contents of each well is then analyzed with a spectrophotometer at wavelengths between 490 nm and 570 nm.
- the lethal dose 50 denotes the concentration of TMZ for which cell viability is reduced by 50% relative to the control condition.
- FIG. 8 illustrates at A a curve showing the percentage of living cells of the U251 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl) as a function of the dose of TMZ received and, at B, the average TMZ concentrations measured at the LD50 in 4 different MTT tests for cells of the U251 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl).
- FIG. 8 illustrates at A a curve showing the percentage of living cells of the U251 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl) as a function of the dose of TMZ received and, at B, the average TMZ concentrations measured at the LD50 in 4 different MTT tests for cells of the U251 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl).
- FIG 9 illustrates at A a curve showing the percentage of living cells of the U87 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl) as a function of the dose of TMZ received and, at B, the averages TMZ concentrations measured at the LD50 in 4 different MTT tests for cells of the U251 line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl).
- FIG. 10 illustrates at A a curve showing the percentage of living cells of the T98G line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl) as a function of the dose of TMZ received and, at B, the average TMZ concentrations measured at the LD50 in 6 different MTT tests for cells of the T98G line transfected with ASO RG6042 or treated with lipofectamine alone (Ctrl).
- the cells transfected with ASO RG6042 or ASO Scr are harvested for the susceptibility test to the alkylating agent Lomustine.
- Lomustine was prepared in the form of a stock solution of 50 mg/ml (214 mM) in pure ethanol. The solution was filtered to sterilize it (0.2 ⁇ m pore filter) and frozen at -20 ° C until further use.
- the cells are distributed in 96-well culture dishes at the rate of 200 cells per well for the U251 and T98G lines. The cells are left developing for 24 hours.
- the cells are then treated for 48 hours with increasing doses of Lomustine at the rate of 5 mM to 500 mM for the U251 line and from 100 mM to 1500 mM for the T98G line. Each dilution is tested in three copies.
- the control condition consists of cells treated with complete culture medium. Blank wells contain only complete culture medium.
- the medium containing Lomustine is removed and replaced with fresh complete culture medium in which the cells are left to incubate for 72 h.
- An MTT test is then set up in the same way as the previous test concerning sensitivity to TMZ in order to evaluate the cell survival in the different wells.
- the lethal dose 50 denotes the concentration of Lomustine for which cell viability is reduced by 50% relative to the control condition.
- FIG. 11 illustrates at A a curve showing the percentage of living cells of the U251 line transfected with ASO RG6042 or Scr as a function of the dose of Lomustine received and, at B, the mean of the concentrations of Lomustine measured at the LD50 in 4 different MTT assays for U251 cell line transfected with ASO RG6042 or Scr.
- FIG. 12 illustrates at A a curve showing the percentage of live cells of the T98G line transfected with ASO RG6042 or Scr as a function of the dose of Lomustine received and, at B, the mean of the concentrations of Lomustine measured at the LD50 in 4 different MTT assays for T98G cell line transfected with ASO RG6042 or Scr.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2102992A FR3121039B1 (fr) | 2021-03-25 | 2021-03-25 | Oligonucléotides anti-sens pour leur utilisation dans un traitement anticancéreux |
| PCT/FR2022/050497 WO2022200720A1 (fr) | 2021-03-25 | 2022-03-18 | Oligonucléotides anti-sens pour leur utilisation dans un traitement anticancéreux |
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| EP4313071A1 true EP4313071A1 (fr) | 2024-02-07 |
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| EP22714905.1A Pending EP4313071A1 (fr) | 2021-03-25 | 2022-03-18 | Oligonucléotides anti-sens pour leur utilisation dans un traitement anticancéreux |
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| US (1) | US20240158797A1 (fr) |
| EP (1) | EP4313071A1 (fr) |
| JP (1) | JP2024511134A (fr) |
| CN (1) | CN117062610A (fr) |
| CA (1) | CA3207034A1 (fr) |
| FR (1) | FR3121039B1 (fr) |
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| FR2836831B1 (fr) * | 2002-03-07 | 2004-06-25 | Centre Nat Rech Scient | Combinaison chimiotherapie et antisens de la dna demethylase |
| EP1991677A2 (fr) * | 2006-01-26 | 2008-11-19 | Isis Pharmaceuticals, Inc. | Compositions et leurs utilisations dirigées contre la huntingtine |
| NZ714887A (en) * | 2009-09-11 | 2019-07-26 | Ionis Pharmaceuticals Inc | Modulation of huntingtin expression |
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2021
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- 2022-03-18 CN CN202280024533.6A patent/CN117062610A/zh active Pending
- 2022-03-18 US US18/281,642 patent/US20240158797A1/en active Pending
- 2022-03-18 JP JP2023558575A patent/JP2024511134A/ja active Pending
- 2022-03-18 CA CA3207034A patent/CA3207034A1/fr active Pending
- 2022-03-18 WO PCT/FR2022/050497 patent/WO2022200720A1/fr not_active Ceased
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| CA3207034A1 (fr) | 2022-09-29 |
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| CN117062610A (zh) | 2023-11-14 |
| JP2024511134A (ja) | 2024-03-12 |
| US20240158797A1 (en) | 2024-05-16 |
| FR3121039A1 (fr) | 2022-09-30 |
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