WO2021006202A1 - 改変ノイラミニダーゼ - Google Patents
改変ノイラミニダーゼ Download PDFInfo
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- WO2021006202A1 WO2021006202A1 PCT/JP2020/026174 JP2020026174W WO2021006202A1 WO 2021006202 A1 WO2021006202 A1 WO 2021006202A1 JP 2020026174 W JP2020026174 W JP 2020026174W WO 2021006202 A1 WO2021006202 A1 WO 2021006202A1
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- Prior art keywords
- neuraminidase
- modified
- neu1
- cells
- nucleic acid
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Definitions
- the present invention relates to a modified neuraminidase, a gene encoding a modified neuraminidase.
- the present invention also relates to a combination of modified neuraminidase and cathepsin A, a combination of a gene encoding modified neuraminidase and a gene encoding cathepsin A.
- the present invention also relates to vectors containing these genes.
- the present invention also relates to pharmaceutical compositions containing these.
- Neuraminidase also called N-acetyl- ⁇ -neuraminidase, lysosomal sialidase
- NEU1 neuraminidase 1
- Patent Document 1 discloses that NEU1 deficiency is also associated with amyloidosis
- Non-Patent Document 1 discloses that NEU1 is also associated with cancer metastasis / infiltration.
- Lysosomal storage disease also called lysosomal storage disease or lysosomal storage disease
- lysosomal storage disease encodes an acidic hydrolyzing enzyme (lysosomal enzyme) or cofactor contained in lysosomes, which are organelles that decompose and metabolize biomolecules inside and outside the cell.
- lysosomal enzyme lysosomal enzyme
- cofactor contained in lysosomes which are organelles that decompose and metabolize biomolecules inside and outside the cell.
- a group of inborn errors of metabolism based on mutations in the gene. It used to be an incurable disease, but since 1990, recombinant enzyme preparations secreted and purified from normal human lysosomal enzyme gene-introduced strains into cultured animal or plant cells have been regularly administered intravenously (1-2) to patients.
- Enzyme replacement therapy which is continuously administered at weekly intervals
- ERT Enzyme replacement therapy
- Non-Patent Document 2 Enzyme replacement therapy has a problem that applicable diseases are limited. Therefore, further treatment methods for lysosomal storage diseases are required.
- the present inventor examined gene therapy using human neuraminidase 1 and found that overexpression of human neuraminidase 1 resulted in intracellular crystals and cell rupture. Therefore, it has been found that the application of human neuraminidase 1 to gene therapy causes damage to cells and is dangerous.
- One of the objects of the present invention is to provide a modified neuraminidase that does not crystallize intracellularly and can be used for gene therapy.
- one of a further object of the present invention is to provide a means for co-localizing neuraminidase 1 to lysosomes.
- neuraminidase 1 does not crystallize even if it is overexpressed in the cell.
- neuraminidase 1 co-localizes with lysosomes by overexpressing cathepsin A (CTSA).
- CTSA cathepsin A
- the present invention (1) In the amino acid sequence shown in SEQ ID NO: 1. Includes (i) W173N and K175S mutations, or (ii) K358N mutations.
- a modified neuraminidase comprising a sequence having 80% sequence identity with the amino acid sequence set forth in SEQ ID NO: 1.
- the vector of (4) which is an AAV vector
- a pharmaceutical composition comprising the modified neuraminidase of (1) or (2) or the vector of any of (4)-(6).
- the pharmaceutical composition of (7) for the treatment of diseases associated with deletion or attenuation of neuraminidase 1 activity, Regarding.
- neuraminidase 1 that does not crystallize even when overexpressed or has very little crystallization.
- neuraminidase 1 can be co-localized with lysosomes when used in combination with cathepsin A.
- NEU1, B: lysosome, C: A and B are superimposed.
- the nucleus was stained with Hoechst 33258, NEU1 was stained with anti-NEU1, and lysosome was stained with Lysotracker.
- A: NEU1, B: lysosome, C: A and B are superimposed.
- the nucleus was stained with Hoechst 33258, NEU1 was stained with anti-NEU1, and lysosome was stained with Lysotracker.
- CTSA + NEU1 modified co-expression plasmid It is a figure which shows an example of CTSA + NEU1 modified co-expression plasmid. It is a figure which shows the plasmid expressing EGFP used as a negative control. It is a figure which shows the neuraminidase activity when each plasmid is introduced into NEU1 knockout HEK293 cells. It is a figure which shows the carboxypeptidase activity when each plasmid is introduced into NEU1 knockout HEK293 cells. It is a figure which shows the neuraminidase activity when each plasmid is introduced into CTSA knockout HEK293 cells.
- FIG. 1 It is a figure which shows the carboxypeptidase activity when the EGFP expression vector (negative control) and CTSA + NEU1 modified co-expression AAV vector are administered to various HEK293 cells.
- the figure shows the neuraminidase activity of healthy skin fibroblasts and the neuraminidase activity when an EGFP expression vector (negative control) or a CTSA + NEU1 modified co-expressing AAV vector is administered to skin fibroblasts derived from galactosialidosis patients. is there.
- the present invention provides, in certain embodiments, a modified neuraminidase.
- the present invention in a further aspect, provides a nucleic acid encoding a modified neuraminidase.
- the modified neuraminidase of this embodiment includes a sequence in which W and 175 K of amino acid position 173 of wild-type neuraminidase 1 shown in SEQ ID NO: 1 are mutated, or a sequence in which K of amino acid position 358 is mutated. More specifically, it includes W173N and K175S mutations, or K358N mutations. In certain embodiments, the modified neuraminidase of this embodiment has the above mutation and is about 75% or more, eg, about 80% or more, about 85% or more, about 90% or more, about the amino acid sequence set forth in SEQ ID NO: 1.
- the modified neuraminidase of this embodiment has the above mutations and further comprises one or more, eg, 1 to about 40, 1 to about 30 in the amino acid sequence set forth in SEQ ID NO: 1.
- the modified neuraminidase of this embodiment comprises or consists of the amino acid sequence set forth in SEQ ID NO: 2 or SEQ ID NO: 3.
- nucleic acid encoding the modified neuraminidase of this embodiment examples include the nucleic acid encoding the above-mentioned modified neuraminidase.
- the nucleic acid encoding wild-type neuraminidase 1 set forth in SEQ ID NO: 4 has a mutation at positions 517 to 319 and a mutation at two or more of positions 523 to 525, or at position 1074.
- Nucleic acids containing mutations can be mentioned. More specifically, nucleic acids containing mutations where positions 517-519 are AAT or AAC, positions 523-525 are TCT, TCC, TCA, TCG, AGT, AGC, or positions 1074 are T or C. Be done.
- the nucleic acid encoding the modified neuraminidase of this embodiment has the above mutation and is about 75% or more, eg, about 80% or more, about 85% or more, about 90 with the nucleic acid sequence set forth in SEQ ID NO: 4. % Or more, about 91% or more, about 92% or more, about 93% or more, about 94% or more, about 95% or more, about 96% or more, about 97% or more, about 98% or more, about 99% or more sequence identical Containing or consisting of a sequence having sex.
- the nucleic acid encoding the modified neuraminidase of this embodiment has the above mutation and further has one or more, for example, 1 to about 40, 1 to the nucleic acid sequence represented by SEQ ID NO: 4. Approximately 30 pieces, 1 piece to about 20 pieces, 1 piece to about 10 pieces, 1 piece to about 5 pieces, for example, 1 piece, 2 pieces, 3 pieces, 4 pieces or 5 pieces, or 1 piece to 4 pieces, for example 1 Containing or consisting of a nucleic acid sequence in which 1, 2, 3, or 4 amino acids are substituted, inserted, deleted and / or added.
- the nucleic acid encoding the modified neuraminidase of this embodiment comprises or comprises the nucleic acid sequence set forth in SEQ ID NO: 5 or SEQ ID NO: 6.
- the identity of the base sequence or amino acid sequence can be determined by using a homology search site using the Internet (for example, on the website of European Bioinformatics Institute (EBI), FASTA, BLAST, PSI-BLAST, and Homology searches such as SSEARCH are available: http: //www.ebi.ac.uk/Tools/sss/).
- a search using BLAST can be performed in the National Center for Biotechnology Information (NCBI) (for example, the BLAST page on the NCBI website; https://blast.ncbi.nlm.nih.gov/Blast. cgi; Altschul, SF et al., J. Mol.
- nucleic acid is a molecule in which nucleotides are polymerized, and includes oligonucleotides, polynucleotides, and the like. It also contains single-stranded or double-stranded DNA and the like. Furthermore, it also includes those formed only of natural nucleotides, those containing a part of unnatural bases, nucleotides and nucleosides, or synthetic nucleic acids. Typically, the nucleic acid is DNA.
- the modified neuraminidase of this embodiment may be a protein to which various modifications such as physiological modification such as sugar chain, labeling such as fluorescence or radioactive substance, or fusion with other proteins have been added.
- various modifications such as physiological modification such as sugar chain, labeling such as fluorescence or radioactive substance, or fusion with other proteins have been added.
- the method for producing the modified neuraminidase of this embodiment is not particularly limited, and examples thereof include recombinant expression (mammalian cells, yeast, Escherichia coli, insect cells, etc.), synthesis using a cell-free system, and the like.
- the cells used for these are not particularly limited, and examples thereof include HEK293 cells.
- the obtained modified neuraminidase can be isolated intracellularly or extracellularly (medium, etc.) and purified as a substantially pure and uniform protein.
- the separation and purification of the protein may be performed by using the separation and purification method used in the usual purification of the protein, and is not limited in any way. For example, a chromatography column, filter, ultrafiltration, salting out, solvent precipitation, solvent extraction, distillation, immunoprecipitation, SDS-polyacrylamide gel electrophoresis, isoelectric focusing, dialysis, recrystallization, etc. are appropriately selected. Proteins can be separated and purified by / or combination.
- the present invention provides, in other embodiments, a vector containing a nucleic acid encoding a modified neuraminidase.
- the vector include, but are not limited to, a plasmid vector, a retrovirus vector, a lentiviral vector, an adenovirus vector, an adenoassociate virus vector, a Sendai virus vector, a Sendai virus envelope vector, a papillomavirus vector, and the like. Absent.
- Preferred examples include retroviral vectors, lentiviral vectors, and adeno-associated virus (AAV) vectors.
- the vector is an AAV vector.
- AAV includes AAV1, AAV2, AAV3 (including 3A and 3B), AAV4, AAV5, AAV6, AAV7, AAV8, AAV9, AAV10, AAV11, tri-AAV, bovine. Includes, but is not limited to, AAV, dog AAV, horse AAV and sheep AAV, as well as any other AAV that is unknown or later discovered.
- the AAV vector is type AAV2.
- the vector may contain a promoter DNA sequence that effectively induces gene expression, a factor that controls gene expression, and a molecule necessary for maintaining the stability of DNA.
- the vector of this embodiment further comprises a nucleic acid encoding cathepsin A. Specifically, about 75% or more, for example, about 80% or more, about 85% or more, about 90% or more, about 91% or more, about 92% or more, about 93% or more with the amino acid sequence shown by SEQ ID NO: 13. , About 94% or more, about 95% or more, about 96% or more, about 97% or more, about 98% or more, about 99% or more, a nucleic acid, a sequence encoding a sequence comprising or consisting of a sequence having sequence identity. Number: 1 or more in the amino acid sequence represented by 13, for example, 1 to about 40, 1 to about 30, 1 to about 20, 1 to about 10, 1 to about 5.
- nucleotide containing or encoding an amino acid sequence nucleic acid containing or encoding an amino acid sequence set forth in SEQ ID NO: 3, about 75% or more of the nucleic acid sequence represented by SEQ ID NO: 14. For example, about 80% or more, about 85% or more, about 90% or more, about 91% or more, about 92% or more, about 93% or more, about 94% or more, about 95% or more, about 96% or more, about 97% or more.
- nucleic acid sequence shown by SEQ ID NO: 14 for example, 1 to about 40, 1 to about 30, 1 Approximately 20 pcs, 1 pcs to approximately 10 pcs, 1 pcs to approximately 5 pcs, for example 1, 2, 3, 4 pcs or 5 pcs, or 1 to 4 pcs, for example 1 pcs, 2 pcs.
- examples thereof include a nucleic acid containing or consisting of a sequence in which 3 or 4 nucleic acids are substituted, inserted, deleted and / or added, and a nucleic acid containing or consisting of the nucleic acid sequence represented by SEQ ID NO: 14.
- the present invention provides, in a further embodiment, cells that secrete modified neuraminidase.
- cells that secrete modified neuraminidase also secrete cathepsin A.
- the cell secreting the modified neuraminidase of this embodiment is, for example, a cell having the above nucleic acid sequence.
- the cell secreting the modified neuraminidase of this embodiment can be prepared, for example, by introducing the above vector.
- the present invention also, in a further embodiment, the above-mentioned modified neuraminidase, a combination of modified neuraminidase and catepsin A, a nucleic acid encoding a modified neuraminidase, a combination of a nucleic acid encoding a modified neuraminidase and a nucleic acid encoding catepsin A, a nucleic acid encoding a modified neuraminidase.
- a pharmaceutical composition comprising a vector containing, or a cell secreting a modified neuraminidase.
- the pharmaceutical composition of this embodiment can be formulated according to a conventional method (see, for example, Remington's Pharmaceutical Science, late edition, Mark Publishing Company, Easton, USA) and is a pharmaceutically acceptable carrier. And additives may be included together. For example, surfactants, excipients, colorants, flavoring agents, preservatives, stabilizers, buffers, suspending agents, tonicity agents, binders, disintegrants, lubricants, fluidity promoters, flavoring agents.
- the present invention is not limited to these, and other commonly used carriers can be appropriately used.
- Examples of the method for administering the pharmaceutical composition of this embodiment include oral administration and parenteral administration, and specific examples of such administration methods include injection administration, nasal administration, pulmonary administration, and transdermal administration.
- Examples of injection administration include systemic or local (eg, subcutaneous, intradermal, skin surface, eyeball or eyelid) of the pharmaceutical composition of this embodiment by intravenous injection, intramuscular injection, intraperitoneal injection, subcutaneous injection and the like. It can be administered to the conjunctival, nasal mucosa, oral and gastrointestinal mucosa, vaginal / intrauterine mucosa, intraperitoneal, intrathecal (eg, intratubal or lumbar intramedullary), or ventricular.
- intrathecal eg, intratubal or lumbar intramedullary
- the administration method can be appropriately selected depending on the patient's age, symptoms, etc.
- the dose can be selected in the range of about 0.000000001 mg to about 1000 mg per kg of body weight per administration.
- the dose can be selected in the range of about 0.00001 to about 100,000 mg / body per patient.
- a gene therapy vector in which a cell secreting modified neuraminidase or a DNA encoding modified neuraminidase is inserted is administered, it can be administered so that the amount of modified neuraminidase is within the above range in the target tissue. ..
- the composition is not limited to these doses.
- the pharmaceutical composition of this embodiment can be used for the treatment of diseases caused by deletion or attenuation of neuraminidase 1 activity.
- diseases include lysosomal storage diseases, amyloidosis, cancer and the like.
- the pharmaceutical composition of this embodiment can be used for the treatment of galactosialidosis or sialidosis.
- the term "patient” or “subject” includes humans or non-human animals, including, for example, humans, mice, rats, monkeys, pigs, dogs, rabbits, hamsters, guinea pigs and the like. However, it is not limited to these.
- treatment refers to, for example, any of alleviation, amelioration, and / or elimination, alleviation and / or stabilization of symptoms (eg, not progressing to more advanced stages). ..
- Necessary targets include the above-mentioned modified neuraminidase, a combination of modified neuraminidase and catepsin A, a nucleic acid encoding modified neuraminidase, a combination of a nucleic acid encoding modified neuraminidase and a nucleic acid encoding catepsin A, and a nucleic acid encoding modified neuraminidase.
- Necessary targets include the above-mentioned modified neuraminidase, a combination of modified neuraminidase and catepsin A, a nucleic acid encoding modified neuraminidase, a combination of a nucleic acid encoding modified neuraminidase and a nucleic acid encoding catepsin A, and a nucleic acid encoding modified neuraminidase.
- a method for treating lysosome storage disease, amyloidosis or cancer, preferably lysosome storage disease, more preferably galactosialidosis or sialidosis which comprises administering a vector containing a vector containing, or a composition containing cells secreting a modified neuraminidase; (3) The above-mentioned modified neuraminidase, combination of modified neuraminidase and catepsin A, nucleic acid encoding modified neuraminidase for the treatment of lysosome storage disease, amyloidosis or cancer, preferably lysosome storage disease, more preferably galactosialidosis or sialidosis.
- nucleic acid encoding a modified neuraminidase a combination of a nucleic acid encoding a modified neuraminidase and a nucleic acid encoding catepsin A, a vector containing a nucleic acid encoding a modified neuraminidase, or a cell secreting a modified neuraminidase.
- modified neuraminidase nucleic acid encoding modified neuraminidase
- vector containing nucleic acid encoding modified neuraminidase cells secreting modified neuraminidase, their morphology, formulation, method of administration, and dosage in these embodiments.
- the embodiment is as described above.
- either simultaneous administration or sequential administration may be performed, or both may be used as one preparation.
- the cell disruption solution is centrifuged at 12000 ⁇ g at 4 ° C. for 5 minutes, and the supernatant is collected to obtain a cell extract.
- the protein is quantified by Bio-Rad DC Protein assay reagent.
- ⁇ Immune fluorescent staining> 1.8 Passage to well chamber slides F-10 Ham (Sigma Aldrich) with fetal bovine serum (Biosera) and PBS are warmed to a final concentration of 10%. Transfection is performed for 24 hours, and the medium of CHO 24 hours after the medium exchange is aspirated with an ejector and washed with 1 mL of 1 ⁇ PBS. Add 1 mL of 0.05% trypsin-1 mM EDTA / PBS and incubate at 37 ° C. for 2 minutes. Add 1 mL of F-10 Ham, exfoliate cells and collect the entire volume in a 15 mL tube.
- Lysottracker Red DND-99 (Thermo) is diluted with F-10 Ham to a final concentration of 1 ⁇ M, replaced with a medium containing Lysottracker, and cultured for 1 hour. After removing the medium, wash once with 500 ⁇ M / well of PBS, add 200 ⁇ L of 4% PFA / PBS, and fix at room temperature for 30 minutes. Wash 3 times at 500 ⁇ L / well. Add 200 ⁇ L / well of 5% goat serum (Cedarlane) and 1% BSA (Sigma Aldrich) / PBS and block at room temperature for 1 hour.
- ⁇ SDS-PAGE> 1 Preparation of separation gel 30% acrylamide: 3.125 mL, 4 ⁇ lower layer buffer (1.5 M Tris-HCl, pH 8.8): 1.875 mL, MilliQ water: 2.425 mL, 10% SDS: 75 ⁇ L, 10% APS : 25 ⁇ L and TEMED: 5 ⁇ L are mixed and poured into a gel plate, water-saturated butanol is laminated on the gel plate, and the mixture is solidified at room temperature to prepare a separation gel (12.5%).
- Sample preparation 6 Sample buffer (0.3M Tris-HCl, pH 6.8, 36% glycerol, 24% SDS, 1.2% 2-mercaptoethanol, 0.012% bromophenol blue) was added to 20 ⁇ L of cells. Add 4 ⁇ L to 40 ⁇ g of the crushed solution and boil for 3 minutes. Add 4 ⁇ L of 6 ⁇ sample buffer to 5 ⁇ L of biotinylated marker or prestained marker, and scalpel up to 24 ⁇ L with Milli-Q water. Soak the sample in a hot water bath at 100 ° C for 3 minutes.
- Sample buffer 0.3M Tris-HCl, pH 6.8, 36% glycerol, 24% SDS, 1.2% 2-mercaptoethanol, 0.012% bromophenol blue
- the electrophoresis tank is filled with the electrophoresis buffer (25 mM Tris, 192 mM glycine, 0.1% SDS), the gel plate is set, and the electrophoresis buffer is also put on the cathode side. Remove the comb, trim the wells and apply the entire sample. Perform SDS-PAGE with a constant current of 20 mA.
- the electrophoresis buffer 25 mM Tris, 192 mM glycine, 0.1% SDS
- ⁇ Western blotting> The gel for concentration is cut out from the gel after electrophoresis and immersed in a blotting buffer (48 mM Tris, 39 mM glycine, 20% methanol) for about 15 minutes. Immerse the PVDF membrane in methanol and then in blotting buffer for 15 minutes. Soak filter paper (6 sheets) in blotting buffer for 15 minutes. Moisten the trans blotter with a transfer buffer, set the filter paper (3 sheets), PVDF film, gel, and filter paper (3 sheets) in this order, and start the transfer. Perform at 15V for about 1 hour. The transferred PVDF membrane is taken out, 50% Blocking ONE / TBS is added, and blocking is performed for 1 hour. Apply the primary antibody solution and react at 4 ° C.
- Example 1 Preparation of modified neuraminidase and confirmation of activity 1.
- Amplification of the gene encoding wild-type human neuraminidase 1 The gene encoding human neuraminidase 1 (SEQ ID NO: 4) is the following primer Forward primer: TTTTTCTAGACACCATGACTGGGGAGCGAC (SEQ ID NO: 7).
- the PCR reaction solution was: forward primer: 1 ⁇ L (50 pmol), reverse primer: 1 ⁇ L (50 pmol), template plasmid (pcDNA3.1 Hygro (-) NEU1): 1 ⁇ L (10 ng), 10 ⁇ KOD buffer: 5 ⁇ L, 25 mM sulfonyl 4 : 2 ⁇ L, 2 mM dNTPs: 5 ⁇ L, KOD plus (Toyobo): 1 ⁇ L were prepared by priming up to 50 ⁇ L with Milli-Q water.
- DNA sample buffer (10 mM Tris-HCl (pH 8.0), 50 mM EDTA, 33% glycerol, 0.3% bromophenol blue). The whole amount was run on a 1% agarose gel. The main band was excised with a Gel Execution kit (Qiagen), and the DNA was purified. The obtained DNA fragments were mixed in this molar amount.
- E. coli transformation ligation product was added to 100 ⁇ L of DH5 ⁇ competent cells (Nippon Gene) and placed on ice for 30 minutes. Heat shock was applied at 42 ° C. for 60 seconds. 300 ⁇ L of SOC medium was added, and the mixture was incubated at 37 ° C. for 1 hour. The entire amount was applied to LB (containing 100 ⁇ g / mL ampicillin). Incubated at 37 ° C. for 14 hours.
- the supernatant was taken, 450 ⁇ L of 2-propanol was added, and the mixture was mixed well. Centrifugated at 18000 xg for 20 minutes at 4 ° C. The supernatant was removed, and 1 mL of 75% ethanol was added. Centrifugation was performed at 18,000 ⁇ g at 4 ° C. for 5 minutes. The supernatant was removed and the pellet was air dried. The pellet was dissolved in 10 ⁇ L of TE buffer (pH 8.0).
- DMEM 4500 mg / mL glucose
- PBS containing fetal bovine serum Biosera
- the medium of HEK293 cultured in a 10 cm dish was aspirated with an ejector and washed with 4 mL of 1 ⁇ PBS.
- 1 mL of 0.05% trypsin-1 mM EDTA / PBS was added, and the cells were cultured at 37 ° C. for 2 minutes.
- 1 mL of DMEM was added, cells were peeled off, and the whole amount was collected in a 15 mL tube.
- NEU1 activity The neuraminidase activity of wild-type NEU1 and NEU1 modified types 1 and 2 was measured according to the method described in ⁇ Measurement of neuraminidase activity> above. The value obtained by subtracting the measured value of neuraminidase activity of NEU1 unintroduced cells from the obtained measured value was defined as neuraminidase activity. The results are shown in the table below and FIG. Both modified types 1 and 2 showed relatively high activity, although they were lower than wild type NEU1.
- Example 2 Confirmation of crystallization of modified neuraminidase 1.
- Transfection into CHO cells Transfect CHO cells with a plasmid incorporating a gene encoding the above wild-type NEU1 and NEU1 modified type 1 (hereinafter, unless otherwise specified, NEU1 modified type 1 is also simply referred to as NEU1 modified type). did. Specifically, the procedure was as follows. F-10 Ham (Sigma Aldrich) and PBS containing fetal bovine serum (Biosera) were warmed to a final concentration of 10%. The medium of CHO cultured in a 10 cm dish (Greener) was sucked with an ejector and washed with 5 mL of 1 ⁇ PBS.
- Opti-MEM (Thermo) was dispensed at 150 ⁇ L ⁇ 2 ⁇ number of plasmids. To one side, 2.5 ⁇ g of each plasmid and 5 ⁇ L of P3000 (Thermo) were added. To the other, 7.5 ⁇ L of Lipofectamine 3000 (Thermo) was added. Both solutions were mixed and allowed to stand at room temperature for 15 minutes. The mixture was applied to the cells and cultured for 24 hours. The medium was replaced with 2 mL of fresh F-10 Ham.
- Example 3 Co-localization of NEU1 with lysosomes in cathepsin A overexpressing cells Transformation was performed according to a known method to obtain a pCXN 2 plasmid (referred to as pCXN 2 CTSA) having the full length of human cathepsin A (CTSA) cDNA (SEQ ID NO: 14). Created (Fig. 5).
- CHO cells were transfected with pCXN 2 CTSA according to the method described above. After 24 hours of medium replacement, the medium was replaced with 2 mL of new medium. 400 ⁇ g / mL G418 (Invivogen) was added as a selective drug, and the cells were cultured for 3 days.
- the medium was changed, the selected drug was added again, and the cells were cultured for another week.
- the cells were increased by changing to a medium without a selective drug.
- the above-mentioned NEU1 modified form 1 was introduced into the obtained CTSA overexpressing cells according to the above-mentioned method, and immunostaining was performed. The results are shown in FIG. As shown in the figure, the NEU1 modified form co-localized with lysosomes in CTSA overexpressing cells. This indicates that NEU1 is transported to lysosomes if CTSA is sufficient.
- Example 4 Preparation of a vector that co-expresses two genes (CTSA and NEU1 modified form) 1.
- Reverse primer: AAAAAGATCTTCAGAGTGTCCCATAGACAC (SEQ ID NO: 16), was prepared in the same procedure as in Example 1.1 above.
- CTSA cDNA Amplification The gene encoding CTSA cDNA (SEQ ID NO: 14) is loaded with the following primers: TTTTAGATCTCACCATGATCCGAGCCGCGCC (SEQ ID NO: 17). Reverse primer: AAAAGCGGCCGCTCAGTATGGCTGCTTGTTC (SEQ ID NO: 18), Using pCXN 2 CTSA as a template plasmid, treatment was performed in the same procedure as in Example 1.1.
- Example 5 Enzyme activity in cells into which various plasmids have been introduced
- each plasmid of EGFP negative control, FIG. 8
- CTSA CTSA
- FEU1 mod NEU1
- FIGS. 9-12 The results are shown in FIGS. 9-12.
- a plasmid into which only mod NEU1 has been introduced shows the same level of NEU1 activity as usual, and is considered to be more effective than wild-type NEU1 in consideration of not crystallizing.
- a vector that co-expresses CTSA and NEU1 is highly likely to be effective for gene therapy of lysosomal storage diseases, particularly galactosialidosis and sialidosis.
- Example 6 Preparation of CTSA + mod NEU1 co-expressing AAV2 1.
- Preparation of pBI-CMV1 CTSA + mod NEU1 NV for template Prepare the restriction enzyme reaction solution as shown in the table below, change the Milli-Q water used to dissolve the air-dried pellets from 10 ⁇ L to 8 ⁇ L, and use EcoRV 0.5 ⁇ L as the restriction enzyme. The treatment was carried out in the same procedure as in Examples 1.3 to 6 except that 0.5 ⁇ L of Xho I (Takara) was used. The one with one band was used as pBI-CMV1 CTSA + mod NEU1 NV as a template for producing a vector for AAV production (FIG. 13).
- CTSA mod NEU1 co-expression unit and EGFP cDNA amplification
- pBI-CMV1 CTSA + mod NEU1 NV and pEGFP-N1 (Takara) as template plasmids
- treatment was performed in the same procedure as in Example 1.1.
- Restriction enzyme treatment The procedure was the same as in Example 1.3, except that the restriction enzyme reaction solution was prepared as shown in the table below.
- Example 7 Transfection of CTSA + mod NEU1 co-expressing AAV2 into HEK293 cells 1.
- DMEM 4500 mg / mL glucose
- PBS containing fetal bovine serum Biosera
- the medium of HEK293 cultured in a 10 cm dish was aspirated with an ejector and washed with 4 mL of 1 ⁇ PBS.
- 1 mL of 0.05% trypsin-1 mM EDTA / PBS was added, and the cells were cultured at 37 ° C. for 2 minutes.
- DMEM 1 mL of DMEM was added, cells were peeled off, and the whole amount was collected in a 15 mL tube. Centrifuge at 200 xg at room temperature for 5 minutes, remove the supernatant, suspend in 3 mL of DMEM, take 30 ⁇ L and add to a 1.5 mL tube. 30 ⁇ L of 0.3% trypan blue was added and mixed to stain the cells. A cell count was performed using a complete blood count plate. 4 ⁇ 10 6 cells were sprinkled on a 10 cm dish (Greener). DMEM was added to the final 10 mL. Incubate at 5% CO 2 , 37 ° C. for 24 hours.
- the contents were transferred to a 1.5 mL tube and centrifuged at 10000 ⁇ g, 4 ° C. for 10 minutes. Again, vortex-centrifugation was performed for 15 seconds. The supernatant was transferred to a new 1.5 mL tube, 50 ⁇ L of AAV Extraction Solution B (Takara) was added and mixed. 100 ⁇ L each was dispensed and stored at ⁇ 80 ° C.
- AAV Quantitative AAV solution 5 ⁇ L, water: 12 ⁇ L, 10 ⁇ DNase buffer: 2 ⁇ L, DNase I (Takara): 1 ⁇ L are gently mixed by pipetting to prepare a DNase reaction solution, 7 ° C., 30 minutes ⁇ 95 ° C., It was allowed to react for 10 minutes.
- Forward primer 5'-GGAACCCCTAGTGATGGAGTT (SEQ ID NO: 23)
- Reverse primer 5'-CGGCCTCAGTGAGCGA (SEQ ID NO: 24)
- Use iQ CYBR Green supermix (2x) Bio-Rad: 10 ⁇ L, 100 ⁇ M forward primer: 0.1 ⁇ L, 100 ⁇ M reverse primer: 0.1 ⁇ L, Nuclease free water: 4.8 ⁇ L, and mix in total.
- a master mix of 15 ⁇ L / sample was prepared.
- pAAV-CMV was diluted to 2 ⁇ 10 9 moles / ⁇ L.
- the plasmid was serially diluted as shown in the table below. The sample was diluted as follows.
- Example 7 CTSA + mod NEU1 co-expressed AAV2 infection Extract containing virus was added to galactosialidosis (GS) or sialidosis (SD) patient-derived skin fibroblasts at 2 ⁇ 10 5 vg / cell or 1 ⁇ 10 5 vg / cell. It was cultured for 1 week. Skin fibroblasts F598 derived from galactosialidosis patients, skin fibroblasts F643 derived from patients with sialidosis, and skin fibroblasts F258 derived from healthy subjects were used as positive controls. Cells were lysed with a detergent and neuraminidase activity was measured with 4-MU-NANA. The results are shown in FIGS. 18 and 19. Addition of AAV2 CTSA + mod NEU1 increased neuraminidase activity in both GS and SD patient-derived skin fibroblasts.
- Example 8 The NEU1 modified form is secreted into the CHO cell supernatant.
- the CHO cells transfected in the same procedure as in Example 2.1 are cultured in a serum-free medium, the culture supernatant is collected, and purified CTSA is added to the above. Neuraminidase activity was measured according to the method. The results are shown in FIG. 1.18 mg of NEU1 modified form 1 was secreted per 1 L of medium.
- Example 9 Purification of CTSA + mod NEU1 co-expressing AAV2 vector Zolotukin et. al. Gene Ther. , 6, 973-985 (1999), purify the vector according to the discontinuous gradient method.
- PBS PBS-MK
- DNase I and RNase A are added and reacted at 37 ° C. for 1 hour.
- Centrifuge at 10000 xg, 10 ° C. for 5 minutes and filter the supernatant with a 0.45 ⁇ m filter.
- PBS-MK is passed through the filter to push out the liquid remaining in the filter.
- Example 10 In vivo In vivo Administration Protocol CTSA mutant Anesthetize mice and cut open the scalp. Insert a two-step needle 1 mm to the right of the bregma and 0.5 mm to the tail and administer 25 ⁇ L of AAV solution. Place the mouse on the body warmer and maintain body temperature until waking up from anesthesia. After 1 week, dissect and divide into cerebrum and cerebellum, and measure enzyme activity.
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Abstract
Description
この出願は、令和1年7月5日に日本国特許庁に出願された出願番号2019-126376号の優先権の利益を主張する。優先権基礎出願はその全体について、出典明示により本明細書の一部とする。
(1)配列番号:1に示されるアミノ酸配列において:
(i)W173NおよびK175S変異、または
(ii)K358N変異、を含み、
配列番号:1に示されるアミノ酸配列と80%の配列同一性を有する配列を含む、改変ノイラミニダーゼ、
(2)配列番号:2または配列番号:3に示される配列を有する、改変ノイラミニダーゼ、
(3)(1)または(2)の改変ノイラミニダーゼをコードする核酸、
(4)(3)の核酸を含む、ベクター、
(5)AAVベクターである、(4)のベクター、
(6)さらに、カテプシンAをコードする核酸を含む、(4)または(5)のベクター、
(7)(1)または(2)の改変ノイラミニダーゼ、または(4)~(6)のいずれかのベクターを含む、医薬組成物、
(8)ノイラミニダーゼ1活性の欠失または減弱に関連する疾患の治療のための、(7)の医薬組成物、
に関する。
(1)必要とする対象に、上記改変ノイラミニダーゼ、改変ノイラミニダーゼとカテプシンAの組み合わせ、改変ノイラミニダーゼをコードする核酸、改変ノイラミニダーゼをコードする核酸とカテプシンAをコードする核酸の組み合わせ、改変ノイラミニダーゼをコードする核酸を含むベクター、または改変ノイラミニダーゼを分泌する細胞を投与することを含む、リソソーム蓄積症、アミロイドーシスまたはがん、好ましくはリソソーム蓄積症、より好ましくはガラクトシアリドーシスまたはシアリドーシスの治療方法;
(2)必要とする対象に、上記改変ノイラミニダーゼ、改変ノイラミニダーゼとカテプシンAの組み合わせ、改変ノイラミニダーゼをコードする核酸、改変ノイラミニダーゼをコードする核酸とカテプシンAをコードする核酸の組み合わせ、改変ノイラミニダーゼをコードする核酸を含むベクター、または改変ノイラミニダーゼを分泌する細胞を含む組成物を投与することを含む、リソソーム蓄積症、アミロイドーシスまたはがん、好ましくはリソソーム蓄積症、より好ましくはガラクトシアリドーシスまたはシアリドーシスの治療方法;
(3)リソソーム蓄積症、アミロイドーシスまたはがん、好ましくはリソソーム蓄積症、より好ましくはガラクトシアリドーシスまたはシアリドーシスの治療のための、上記改変ノイラミニダーゼ、改変ノイラミニダーゼとカテプシンAの組み合わせ、改変ノイラミニダーゼをコードする核酸、改変ノイラミニダーゼをコードする核酸とカテプシンAをコードする核酸の組み合わせ、改変ノイラミニダーゼをコードする核酸を含むベクター、または改変ノイラミニダーゼを分泌する細胞の使用;
(4)リソソーム蓄積症、アミロイドーシスまたはがん、好ましくはリソソーム蓄積症、より好ましくはガラクトシアリドーシスまたはシアリドーシスの治療のための医薬の製造における、上記改変ノイラミニダーゼ、改変ノイラミニダーゼとカテプシンAの組み合わせ、改変ノイラミニダーゼをコードする核酸、改変ノイラミニダーゼをコードする核酸とカテプシンAをコードする核酸の組み合わせ、改変ノイラミニダーゼをコードする核酸を含むベクター、または改変ノイラミニダーゼを分泌する細胞の使用、も提供する。
<ノイラミニダーゼ活性測定>
1.細胞破砕液の作製
培地を除去した後、PBSで細胞を剥がし、1.5mLチューブに回収する。これを500×g、4℃で5分間遠心分離し、上清を除去して1mLのPBSで再懸濁し、再度遠心分離した。上清を除去し、250μの溶解バッファー(1% Triton X-100/150mM NaCl/50mM酢酸ナトリウムバッファー(pH4.5)/1μMペプスタチンA(ペプチド研究所)/2mM EDTA)を加え、ピペッティングにより細胞破砕液を得る。
溶解バッファーで希釈した細胞破砕液を96ウェルプレートに5μLずつ分注する。下表の濃度の検量線を96ウェルプレート内に作製する。
DC Protein Assay Reagent(Bio-Rad)のA液とS液を50:1で混合し、各ウェルに25μLずつ加えた後、B液を200μLずつ加え、15分間、室温で反応させる。750nmの吸光度をプレートリーダー(Tecan)で測定し、タンパク質定量を行う。
細胞破砕液を20μLずつ分注し、20μLの基質溶液(0.2M酢酸ナトリウムバッファー(pH4.5):8μL、Mili-Q水:5μL、50mg/mL BSA(Sigma Aldrich):2μL、2mM 4-MU-NANA(Carbosynth):5μL)を加え、37℃で30分間反応させる。その後、0.2Mグリシン-NaOHバッファー(pH10.7)を370μL加え、反応を停止させる。下表の濃度の検量線を作製する。
励起波長355nm、蛍光波長460nmで蛍光強度を測定し、比活性を算出する。
上記細胞破砕液を12000×g、4℃、5分間遠心し、上清を回収して細胞抽出液とする。Bio-Rad DC Protein assay reagentでタンパク定量を行っておく。
1.5mLチューブ3本に細胞抽出液25μLを加える。基質MIXとして、0.2M NaOAcバッファー(pH5.6):12.5μL、3mM Z-Phe-Leu(Sigma Aldrich):12.5μLを混合したものをチューブ2本に加え、3mM Z-Phe-Leuの代わりに水を12.5μL混合したものを基質(-)としてチューブ1本に加える。30分間、25℃で反応させた後、100℃の沸騰水に3分間浸し、反応を停止させる。
下表のとおり、検量線のスタンダードを調製する。
チューブ1本あたり、0.1Mリン酸カリウムバッファー(pH7.0):500μL、0.2M N-エチルマレイミド(Sigma Aldrich):1.25μL、L-アミノ酸オキシダーゼ(Corotalus atrox由来、Sigma Aldrich)/20mMリン酸カリウム(pH7.0):1μL、ペルオキシダーゼ(Sigma Aldrich):0.5μL、10mg/mL o-Dianisidine(Sigma Aldrich)溶液:15μLを混合した2次反応液を調製し、各サンプル、スタンダードに加え、37℃、40分間インキュベートする。40分後、6M HClを500μLずつ各サンプル、スタンダードに加え、反応を停止させる。各サンプルおよびスタンダードを96ウェルプレートに200μLずつ加え、540nmの吸光度を測定する。
1.8ウェルチャンバースライドへの継代
最終濃度10%になるようウシ胎児血清(Biosera)を加えたF-10 Ham(Sigma Aldrich)、およびPBSを温めておく。トランスフェクションを24時間行い、培地交換後さらに24時間後のCHOの培地をアスピレーターで吸引し、1×PBS 1mLで洗浄する。0.05%トリプシン-1mM EDTA/PBS 1mLを加え、37℃、2分間培養する。F-10 Ham 1mLを加え、細胞を剥がし、15mLチューブに全量回収する。200×g、室温で5分間遠心し、上清を除いてF-10 Ham 1mLで懸濁、30μLを取って1.5mLチューブに加える。0.3%トリパンブルー30μLを加え、混合して細胞を染色する。血球計数版を用いて、セルカウントを行う。8ウェルチャンバースライド(Thermo)に1×104細胞/ウェル加え、F-10 Hamで300μLにメスアップする。
Lysotrackerで染色する場合は、Lysotracker Red DND-99(Thermo)を最終濃度1μMになるようにF-10 Hamで希釈し、Lysotracker入りの培地に交換して1時間培養する。培地を除き、PBS 500μM/ウェルで1回洗浄後に4%PFA/PBSを200μL加え、室温で30分間固定する。500μL/ウェルで3回洗浄する。5%ヤギ血清(Cedarlane)、1%BSA(Sigma Aldrich)/PBSを200μL/ウェル加え、室温、1時間ブロッキングする。1次抗体(抗NEU1 F-8(Santa Cruz、100倍希釈)、または抗LAMP1(abcam、300倍希釈))で処理(150μL/ウェル)し、4℃、16時間置く。1次抗体液を除き、0.1%Tween20/PBS 500μLで洗浄する(×5回)。PBS 500μLで洗浄する(×1回)。2次抗体(Alexa Fluor 488 conjugated anti-mouse IgG (H+L) F(ab’)2(CST、1000倍希釈)またはAlexa Fluor 555 conjugated anti-rabbit IgG (H+L) F(ab’)2(CST、1000倍希釈))およびHoechst 33258での処理(150μL/ウェル)を、室温、1時間行う。0.1%Tween20/PBS 500μL/ウェルで洗浄する(×5回)。PBS 500μL/ウェルで洗浄する(×2回)。50%グリセロール/PBSで封入し、共焦点レーザー顕微鏡LSM700で観察する。
1.分離用ゲルの作成
30%アクリルアミド:3.125mL、4×下層バッファー(1.5M Tris-HCl、pH8.8):1.875mL、MilliQ水:2.425mL、10%SDS:75μL、10%APS:25μL、TEMED:5μLを混合し、ゲル板に流し込んで、上に水飽和ブタノールを積層し、室温で固めて分離用ゲル(12.5%)を作製する。
30%アクリルアミド:0.65mL、4×上層バッファー(0.5M Tris-HCl、pH6.8):1.25mL、MilliQ水:3.02mL、10%SDS:50μL、10%APS:25μL、TEMED:5μLを混合し、ゲル板に流し込んで、コームを差し込み、室温で固めて濃縮用ゲルを作製する。
6×サンプルバッファー(0.3M Tris-HCl、pH6.8、36%グリセロール、24%SDS、1.2%2-メルカプトエタノール、0.012%ブロモフェノールブルー)を20μLにメスアップした細胞破砕液40μg分に4μL加え、3分間煮沸する。ビオチン化マーカー、またはプレステインドマーカー5μLに6×サンプルバッファーを4μL加え、24μLにMilli-Q水でメスアップする。サンプルを100℃の湯浴に3分間浸ける。
泳動槽を泳動バッファー(25mM Tris、192mMグリシン、0.1%SDS)で満たし、ゲル板をセットしてカソード側にも泳動バッファーを入れる。コームを抜き、ウェルを整えてサンプルを全量アプライする。20mA定電流でSDS-PAGEを行う。
泳動後のゲルから濃縮用ゲルを切り取り、ブロッティングバッファー(48mM Tris、39mMグリシン、20%メタノール)に15分程浸す。PVDF膜をメタノールに浸し、さらにブロッティングバッファーに15分間浸す。ろ紙(6枚)をブロッティングバッファーに15分間浸す。トランスブロッターを転写バッファーで湿らせ、ろ紙(3枚)、PVDF膜、ゲル、ろ紙(3枚)の順にセットし、転写を開始する。15V、約1時間行う。転写が終わったPVDF膜を取り出し、50%Blocking ONE/TBSを加えて1時間、ブロッキングする。1次抗体溶液をアプライし、4℃で一晩反応させる。PBS-Tで洗浄し(5分×3回)、その後、PBSで2回洗浄する。二次抗体溶液をPVDF膜に付ける。PBS-Tで洗浄し(5分×3回)、PBSで1回洗浄し、TBSで1回洗浄する。その後、HRP標識の場合はWestern lightning Ultra(PerkinElmer)に浸し、Bio-Rad Chemi Doc RXS+で検出する。AP標識の場合は、BCIP/NBT(Wako)/50mM MgSO4/TBSに浸し、検出する。
1.野生型ヒトノイラミニダーゼ1をコードする遺伝子の増幅
ヒトノイラミニダーゼ1をコードする遺伝子(配列番号:4)を、以下のプライマー
フォワードプライマー:TTTTTCTAGACACCATGACTGGGGAGCGAC(配列番号:7)
リバースプライマー:ATATAAGCTTTCAGAGTGTCCCATAGA(配列番号:8)、
を用いて94℃2分間を1回、94℃30秒間、57℃30秒間、68℃60秒間のサイクルを35サイクル行うPCR反応により増幅した。PCR反応液は、フォワードプライマー:1μL(50pmol)、リバースプライマー:1μL(50pmol)、テンプレートプラスミド(pcDNA3.1 Hygro (-) NEU1):1μL(10ng)、10×KODバッファー:5μL、25mM MgSO4:2μL、2mM dNTPs:5μL、KOD plus(Toyobo):1μLを、Milli-Q水で50μLにメスアップして調製した。
上述のプライマーに加えて、改変型1の作製のため、以下のプライマー、
フォワードプライマー:CTACCATGTTGGTAAACAGCAGCGATGATGGTGTTTC(配列番号:9)
リバースプライマー:GAAACACCATCATCGCTGCTGTTTACCAACATGGTAG(配列番号:10)、
および改変型2の作製のため、以下のプライマー、
フォワードプライマー:CTCATGGCGGAACGAGACAGTCC(配列番号:11)
リバースプライマー:GGACTGTCTCGTTCCGCCATGAG(配列番号:12)、
を使用した。
上記1.と同様にPCR増幅した後、エタノール125μL、2M NaCl 5μLを加え、18000×g、4℃、30分間遠心した。上清を除き、DNAサンプルバッファー(10mM Tris-HCl(pH8.0)、50mM EDTA、33%グリセロール、0.3%ブロモフェノールブルー)で溶解した。全量を1%アガロースゲルで泳動した。Gel Extraction kit(Qiagen)で主要バンドを切り出し、DNAを精製した。得られたDNAフラグメントを当モル混合した。25mM MgSO4 2μL、2mM dNTPs 5μL、KOD plusバッファー5μL、KOD plus 1μLを加え、水で50μLにメスアップした。これを、94℃2分間を1回、94℃30秒間、57℃30秒間、68℃80秒間のサイクルを35サイクル行うPCR反応により増幅した。
PCR後の反応液にTE飽和フェノールとCIA(クロロホルムとイソアミルアルコールを24:1で混合したもの)を25μLずつ加え、よく振った。4℃、20000×g、5分間遠心分離した。上清を新しい1.5mLチューブに回収し、CIAを50μL加えた。4℃、20000×g、5分間遠心分離した。上清を新しい1.5mLチューブに回収し、エタノール125μLと2M NaClを5μL加えた。20000×g、4℃、20分間遠心分離した。上清を捨て、ペレットを風乾した。Milli-Q水を10μL加え、ペレットを溶解した。下表のとおり制限酵素反応液を調製し、37℃、16時間反応させた。
制限酵素反応液を全量、1%アガロースゲルで泳動した。主要バンドを切り出し、Gel Extraction kitでDNAを精製した。プラスミド25fmol、インサート125fmolを混合し、同体積のDNA Ligation kit mighty mix(Takara)を加え、16℃、16時間反応させた。
ライゲーション産物をDH5αコンピテントセル(ニッポンジーン)100μLに加え、30分間氷上に置いた。60秒間、42℃でヒートショックを加えた。SOC培地を300μL加え、37℃、1時間インキュベートした。LB(100μg/mLアンピシリン入り)に全量塗った。37℃、14時間インキュベートした。
LB培地2mLに100mg/mLアンピシリンを2μL加えた。コロニーを爪楊枝で拾って培地に入れ、37℃、16時間振とうした。菌液1mLをとり、室温、1000×g、5分間遠心分離した。上清を除き、氷冷したSolI(50mMスクロース、25mM Tris-HCl(pH8.0)、10mM EDTA)を100μL加え、再懸濁した。SolII(0.2M NaOH、1%SDS)を200μL加え、転倒混和して氷上で5分間放置した。氷冷したSolIII(3M酢酸カリウム、2M酢酸)を150μL加え、転倒混和した。12000×g、4℃、5分間遠心分離した。上清を取り、10mg/mL RNase A(Sigma Aldrich)を1μL入れ、37℃、1時間インキュベートした。TE飽和フェノールとCIAを255μLずつ加え、よく振り混ぜた。12000×g、5分間、4℃遠心分離した。上清を回収し、CIA 450μLを加え、よく振り混ぜた。12000×g、5分間、4℃遠心分離した。上清を取り、2-プロパノールを450μL加え、よく混ぜた。18000×g、20分間、4℃遠心分離した。上清を除き、75%エタノールを1mL加えた。18000×g、4℃、5分間遠心分離した。上清を除き、ペレットを風乾した。TEバッファー(pH8.0)10μLでペレットを溶かした。各DNA溶液1μL、10×Mバッファー2μL、0.1%BSA 2μL、Milli-Q水14μL、Xba I 0.5μL、Hind III 0.5μLをそれぞれ混合し、37℃、1時間、インキュベートした。6×DNAサンプルバッファーを4μL加え、1%アガロースゲルで泳動した。
ミニプレップで、インサートが正確に挿入されているプラスミドを持つコロニーを1mLのLB培地(100μg/mLアンピシリン入り)に入れ、12時間、37℃で培養した。200mLのLB培地(100μg/mLアンピシリン入り)に移し、37℃で16時間培養した。Hipure plasmid midiprep kit(Thermo)を用いて、DNAを抽出・精製した。得られたプラスミドに目的の変異が入っているか、配列を確認した(NEU1改変型導入プラスミドについて、図1)。
最終濃度10%になるよう、ウシ胎児血清(Biosera)を加えたDMEM(4500mg/mLグルコース)(Sigma Aldrich)、PBSを温めておいた。10cmディッシュ(Iwaki Collagen typeIcoated)で培養したHEK293の培地をアスピレーターで吸引し、1×PBS 4mLで洗浄した。0.05%トリプシン-1mM EDTA/PBS 1mLを加え、37℃、2分間培養した。DMEM 1mLを加え、細胞を剥がし、15mLチューブに全量回収した。200×g、室温で5分間遠心し、上清を除いてDMEM 1mLで懸濁、30μLを取って1.5mLチューブに加えた。0.3%トリパンブルー30μLを加え、混合して細胞を染色した。血球計数版を用いて、セルカウントを行った。35mmディッシュ(Iwaki Collagen typeIcoated)に細胞を1×106個撒いた。最終1.5mLになるようにDMEMを加えた。5%CO2、37℃で24時間培養した。Opti-MEM(Thermo)を150μL×2×プラスミド数分注した。一方に各プラスミド2.5μg、P3000(Thermo)を5μL加えた。もう一方にLipofectamine 3000(Thermo)を7.5μL加えた。両液を混ぜて15分間、室温に置いた。混合液を細胞にかけ、24時間、培養した。培地を新しいDMEM 2mLに交換した。
上記<ノイラミニダーゼ活性測定>に記載の方法に従って、野生型NEU1、NEU1改変型1、2のノイラミニダーゼ活性を測定した。得られた測定値から、NEU1未導入細胞のノイラミニダーゼ活性の測定値を差し引いた値をノイラミニダーゼ活性とした。結果を下表、および図2に示す。改変型1、2とも、野生型NEU1よりは低いものの、比較的高い活性を示した。
1.CHO細胞へのトランスフェクション
上記野生型NEU1およびNEU1改変型1(以下、特に断らない場合はNEU1改変型1を単にNEU1改変型とも称する)をコードする遺伝子を組み込んだプラスミドで、CHO細胞をトランスフェクトした。具体的には、以下の手順で実施した。最終濃度10%になるよう、ウシ胎児血清(Biosera)を加えたF-10 Ham(Sigma Aldrich)、PBSを温めておいた。10cmディッシュ(Greiner)で培養したCHOの培地をアスピレーターで吸い、1×PBS 5mLで洗浄した。0.05%トリプシン-1mM EDTA/PBS 1mLを加え、37℃、2分間培養した。F-10 Ham 1mLを加え、細胞を剥がし、15mLチューブに全量回収した。200×g、室温で5分間遠心分離し、上清を除いてF-10 Ham 1mLで懸濁、30μLを取って1.5mLチューブに加えた。0.3%トリパンブルー30μLを加え、混合して細胞を染色した。血球計数版を用いて、セルカウントを行った。35mmディッシュ(Greiner)に細胞を1×106個撒いた。最終1.5mLになるようにF-10 Hamを加えた。5%CO2、37℃で24時間培養した。Opti-MEM(Thermo)を150μL×2×プラスミド数分注した。一方に各プラスミド2.5μg、P3000(Thermo)を5μL加えた。もう一方にLipofectamine 3000(Thermo)を7.5μL加えた。両液を混ぜて15分間、室温に置いた。混合液を細胞にかけ、24時間培養した。培地を新しいF-10 Ham 2mLに交換した。
上記<免疫蛍光染色>に記載の方法に従って、遺伝子導入して4日後に、NEU1については抗NEU1抗体、リソソームについては抗LAMP1を用いて免疫染色を行った。
公知の方法に従って形質転換を行い、ヒトカテプシンA(CTSA)cDNA(配列番号:14)の全長を有するpCXN2プラスミド(pCXN2 CTSAという)を作成した(図5)。上記の方法に従い、CHO細胞をpCXN2 CTSAでトランスフェクトした。培地交換24時間後、新しい培地2mLに交換した。選択薬剤として400μg/mL G418(Invivogen)を加え、3日間培養した。培地交換し、再度選択薬剤を加え、さらに1週間培養した。選択薬剤無しの培地に交換し、細胞を増やした。得られたCTSA過剰発現細胞に、上記のNEU1改変型1を上記の方法に従い導入、免疫染色を行った。結果を図6に示す。図に示されるとおり、CTSA過剰発現細胞において、NEU1改変型はリソソームと共局在した。このことは、CTSAが十分にあれば、NEU1がリソソームへ輸送されることを示す。
1.NEU1改変型1(mod NEU1)のcDNA増幅、ベクターへの組み込み
以下のプライマー
フォワードプライマー:TTTTGAATTCCACCATGACTGGGGAGCGACC(配列番号:15)
リバースプライマー:AAAAAGATCTTCAGAGTGTCCCATAGACAC(配列番号:16)、
を用いて、上記実施例1.1と同様の手順で調製した。
制限酵素としてEcoR I 0.5μL、Bgl II 0.5μLを使用する以外は、実施例1.4~6と同様の手順で処理した。得られたインサートが正確に組み込まれているプラスミドをpBI-CMV1 mod NEU1とし、次のCTSA cDNA組み込みに用いた。
CTSA cDNAをコードする遺伝子(配列番号:14)を、以下のプライマー
フォワードプライマー:TTTTAGATCTCACCATGATCCGAGCCGCGCC(配列番号:17)
リバースプライマー:AAAAGCGGCCGCTCAGTATGGCTGCTTGTTC(配列番号:18)、
テンプレートプラスミドとしてpCXN2 CTSAを用いて、実施例1.1と同様の手順で処理した。
制限酵素としてBgl II 0.5μL、Not I 0.5μLを使用する以外は、実施例1.4~6と同様の手順で処理した。得られたインサートが正確に組み込まれているプラスミドをpBI-CMV1 CTSA+mod NEU1(図7)とし、以降の実験に用いた。
実施例1.7と同様の手順で処理した。
上記のCTSA+mod NEU1に加え、EGFP(ネガティブコントロール、図8)、CTSA(図5)、mod NEU1(図1)の各プラスミドを、上述の方法に従い、それぞれCTSAノックアウト(KO)またはNEU1ノックアウトHEK293細胞に導入した。導入後、界面活性剤で細胞を溶解し、上記の方法に従い、ノイラミニダーゼ活性およびカルボキシペプチダーゼ活性をそれぞれ測定した。結果を図9~12に示す。両酵素を同時に発現するプラスミドを導入した細胞は、CTSA KO、NEU1 KO細胞の両方で、ノイラミニダーゼ活性とカルボキシペプチダーゼ活性が上昇した。また、ノイラミニダーゼのみを発現するプラスミドを導入した細胞は、NEU1 KO細胞では通常のHEK293細胞と同程度のノイラミニダーゼ活性を示したが、CTSA KO細胞では通常のHEK293細胞よりも低いノイラミニダーゼ活性を示した。これにより、ノイラミニダーゼ活性には、CTSA活性が重要であることが明らかとなった。mod NEU1のみを導入したプラスミドであっても、通常と同程度のNEU1活性を示しており、結晶化しないことを考慮すれば、野生型NEU1よりも有効であると考えられる。また、CTSAとNEU1を同時発現するベクターは、リソソーム蓄積症、特にガラクトシアリドーシス、シアリドーシスの遺伝子治療に有効である可能性が高いことが示された。
1.テンプレート用pBI-CMV1 CTSA+mod NEU1 NV 作成
下表のとおり制限酵素反応液を調製し、風乾したペレットの溶解に使用するMilli-Q水を10μLから8μLに変更し、制限酵素としてEcoR V 0.5μL、Xho I(Takara)0.5μLを使用する以外は、実施例1.3~6と同様の手順で処理した。バンドが1本のものを、pBI-CMV1 CTSA+mod NEU1 NVとして、AAV製造用ベクター作製用テンプレートとして用いた(図13)。
以下のプライマー
フォワードプライマー:TTTTAAGCTTGAGTCAGTGAGCGAGGAAGC(配列番号:19)、
TTTTGAATTCCACCATGGTGAGCAAGGG(配列番号:20)、
リバースプライマー:TTTTTCTAGATCAGAGTGTCCCATAGACACTG(配列番号:21)、
AAAAAGATCTTTACTTGTACAGCTCGTCCATGC(配列番号:22)、
テンプレートプラスミドとしてpBI-CMV1 CTSA+mod NEU1 NV、およびpEGFP-N1(Takara)を用いて、実施例1.1と同様の手順で処理した。
3.制限酵素処理
下表のとおり制限酵素反応液を調製した以外は、実施例1.3と同様の手順で処理した。
制限酵素としてBgl II 0.5μL、Not I 0.5μLを使用する以外は、実施例1.4~6と同様の手順で処理した。得られたインサートが正確に組み込まれているベクターをpAAV-CMV CTSA+mod NEU1(図14)あるいはpAAV-CMV EGFPとし、以降の実験に用いた。
実施例1.7と同様の手順で処理した。
1.HEK293FT播種
最終濃度10%になるよう、ウシ胎児血清(Biosera)を加えたDMEM(4500mg/mLグルコース)(Sigma Aldrich)、PBSを温めておいた。10cmディッシュ(Iwaki Collagen typeIcoated)で培養したHEK293の培地をアスピレーターで吸引し、1×PBS 4mLで洗浄した。0.05%トリプシン-1mM EDTA/PBS 1mLを加え、37℃、2分間培養した。DMEM 1mLを加え、細胞を剥がし、15mLチューブに全量回収した。200×g、室温で5分間遠心し、上清を除いてDMEM 3mLで懸濁、30μLを取って1.5mLチューブに加えた。0.3%トリパンブルー30μLを加え、混合して細胞を染色した。血球計数版を用いて、セルカウントを行った。10cmディッシュ(Greiner)に細胞を4×106個撒いた。最終10mLになるようにDMEMを加えた。5%CO2、37℃で24時間培養した。
CalPhos Transfection Reagent(Takara)を使用した。Calcium Solutionを滅菌水で6倍希釈した。希釈したCalcium Solution 1000μLにプラスミド3種類(pAAV-CMV EGFPまたはpAAV CTSA+mod NEU1;pRC2-mi342;pHelper、各TEバッファー(pH8.0)中1μg/μL、図15)を6μLずつ加えた。2×HBSを1018μL加え、15回激しく振って混合した。室温で3分間静置し、細胞に全量加えた。12時間後、DMEM(2%ウシ胎児血清)8mLに全量培地交換した。
細胞に0.5M EDTA-NaOH(pH8.0)を100μL加え、10分間、室温に置いた。細胞をはがし、15mLチューブに回収した。ディッシュを2mLのDMEM+25μLの0.5M EDAT-NaOH(pH8.0)で洗いこみ、上記のチューブに回収した。1700×g、4℃、10分間遠心分離した。可能な限り上清を除き、ボルテックスで細胞をほぐした。500μLのAAV Extraction Solution A(Takara)を加えた。15秒間ボルテックスした。1.5mLチューブに中身を移し、10000×g、4℃、10分間遠心分離した。再度、15秒間のボルテックス~遠心分離を行った。上清を新しい1.5mLチューブに移し、AAV Extraction Solution B(Takara)を50μL加え、混合した。100μLずつ分注し、-80℃で保存した。
AAV溶液:5μL、水:12μL、10×DNaseバッファー:2μL、DNase I(Takara):1μLを、ピペッティングで穏やかに混ぜてDNase反応液を調製し、7℃、30分間→95℃、10分間反応させた。以下のプライマー、
フォワードプライマー:5'-GGAACCCCTAGTGATGGAGTT(配列番号:23)
リバースプライマー:5'-CGGCCTCAGTGAGCGA(配列番号:24)、
を使用して、iQ CYBR Green supermix(2×)(Bio-Rad):10μL、100μMフォワードプライマー:0.1μL、100μMリバースプライマー:0.1μL、Nuclease free water:4.8μLを混合し、全量で15μL/サンプルのマスターミックスを調製した。pAAV-CMVを2×109 moles/μLに希釈した。
下表のようにプラスミドを段階希釈した。
次のようにサンプルを希釈した。
1:20希釈:サンプル5μL+水95μL、
1:100希釈:1:20希釈を20μL+水80μL、
1:500希釈:1:100希釈を20μL+水80μL、
1:2500希釈:1:500希釈を20μL+水80μL、
各サンプルとスタンダードを5μLずつ96ウェルプレートにアプライし、マスターミックスを15μLずつ加え、ピペッティングして混ぜた。95℃3分間/95℃15秒間/60℃60秒間/read plate/ステップ3から40サイクル/融解曲線55℃→95℃の条件でPCRを行った。解析にはBio-Rad CFX ConnectリアルタイムPCR解析システムを用いた。
ウイルスを含む抽出液を1×105vg/細胞でNEU1ノックアウト(KO)あるいはCTSA KO HEK293に添加し、1週間培養した。界面活性剤で細胞を溶解し、4-MU-NANAでノイラミニダーゼ活性を、Z-Phe-Leu-OHでカルボキシペプチダーゼ活性を測定した。結果を図16、17に示す。図に示すとおり、CTSA KO、NEU1 KO HEK293の両方で、AAV2 CTSA+mod NEU1を添加するとノイラミニダーゼ活性、およびカルボキシペプチダーゼ活性が上昇した
ウイルスを含む抽出液を2×105vg/細胞あるいは1×105vg/細胞でガラクトシアリドーシス(GS)、またはシアリドーシス(SD)患者由来皮膚繊維芽細胞に添加し、1週間培養した。ガラクトシアリドーシス患者由来皮膚繊維芽細胞F598、シアリドーシス患者由来皮膚繊維芽細胞F643、およびポジティブコントロールとして健常者由来皮膚繊維芽細胞F258、を使用した。界面活性剤で細胞を溶解し、4-MU-NANAでノイラミニダーゼ活性を測定した。結果を図18、19に示す。GS患者由来、SD患者由来皮膚繊維芽細胞の両方で、AAV2 CTSA+mod NEU1を添加するとノイラミニダーゼ活性が上昇した。
実施例2.1と同様の手順でトランスフェクトしたCHO細胞を、無血清培地で培養し、培養上清を回収し、精製CTSAを加えて上記の方法に従い、ノイラミニダーゼ活性を測定した。結果を図20に示す。培地1Lあたり、1.18mgのNEU1改変型1が分泌されていた。
Zolotukhin et. al. Gene Ther., 6, 973-985 (1999)に記載される非連続グラジエント法に基づいてベクターを精製する。凍結保存していた細胞に1mM塩化マグネシウム入りPBS(PBS-MK)を加え、融解する。DNase I、およびRNase Aを加え、37℃、1時間反応させる。10000×g、10℃、5分間遠心し、上清を0.45μmフィルターでフィルトレーションする。また、PBS-MKをフィルターに通し、フィルター内に残った液を押し出す。超遠心チューブにサンプルを加え、長い針を付けたシリンジで、15%イオジキサノール/1MNaCl/PBS-MKをサンプルの下にアプライする。次いで、25%イオジキサノール/フェノールレッド/PBS-MKを下層にアプライする。また、40%イオジキサノール/PBS-MKを下層にアプライする。さらに、54%イオジキサノール/PBS-MKを下層にアプライする。50000rpm(使用ローターは70.1 Ti、200000×g)、18℃、2時間遠心する。遠心終了後、40%イオジキサノール層を回収する。100kDa cut Amicon Ultra でPBSにバッファー交換する。
CTSA mutantマウスを麻酔し、頭皮を切り開く。ブレグマから右に1mm、尾の方に0.5mmの位置に二段針を差し込み、AAV溶液を25μL投与する。カイロの上にマウスを置き、麻酔から覚めるまで体温を維持する。1週間後、解剖して大脳と小脳に分け、酵素活性を測定する。
Claims (8)
- 配列番号:1に示されるアミノ酸配列において:
(i)W173NおよびK175S変異、または
(ii)K358N変異、を含み、
配列番号:1に示されるアミノ酸配列と80%の配列同一性を有する配列を含む、改変ノイラミニダーゼ。 - 配列番号:2または配列番号:3に示される配列を有する、改変ノイラミニダーゼ。
- 請求項1または2に記載の改変ノイラミニダーゼをコードする核酸。
- 請求項3に記載の核酸を含む、ベクター。
- AAVベクターである、請求項4に記載のベクター。
- さらに、カテプシンAをコードする核酸を含む、請求項4または5に記載のベクター。
- 請求項1または2に記載の改変ノイラミニダーゼ、または請求項4~6のいずれか1項に記載のベクターを含む、医薬組成物。
- ノイラミニダーゼ1活性の欠失または減弱に関連する疾患の治療のための、請求項7に記載の医薬組成物。
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CN114555800A (zh) | 2022-05-27 |
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