WO2012133572A1 - 形質細胞または形質芽細胞の選択方法、目的抗原特異的な抗体の製造方法、新規モノクローナル抗体 - Google Patents
形質細胞または形質芽細胞の選択方法、目的抗原特異的な抗体の製造方法、新規モノクローナル抗体 Download PDFInfo
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- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/26—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against hormones ; against hormone releasing or inhibiting factors
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- C—CHEMISTRY; METALLURGY
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- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
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- 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
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- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/563—Immunoassay; Biospecific binding assay; Materials therefor involving antibody fragments
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a method for selecting plasma cells or plasmablasts, a method for producing an antibody specific to a target antigen, and a novel monoclonal antibody. More specifically, the present invention relates to a method for selecting plasma cells or plasmablasts that specifically bind to the target antigen, and to produce antibodies specific to the target antigen using the plasma cells or plasmablasts obtained by using this method. And a novel monoclonal antibody newly obtained by this antibody production method.
- hybridomas with autonomous growth ability are produced by fusing antibody-producing cells with myeloma cells, and clones having antibody production ability with the desired specificity are screened from them.
- the method has been widely used.
- the hybridoma method has several drawbacks.
- One is that the hybridoma technique is limited to mouse antibody-producing cells, so that it is difficult to apply to other animal species.
- it takes a long time and labor to screen hybridomas.
- Another problem is that even if screening is performed, there is no guarantee that a clone having the ability to produce antigen-specific antibodies will be obtained.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2009-34047.
- Plasma cells purified from human lymphocytes are placed in microwells that have been specially processed, and antibodies secreted in large quantities from the plasma cells are immobilized on the substrate around the plasma cells and reacted with the labeled antigen. This is a method for identifying antigen-specific plasma cells.
- Patent Document 1 requires a special apparatus for identification of antigen-specific plasma cells, and requires very complicated operations for cell recovery. Furthermore, since this method requires purification of plasma cells using cell surface antigens, antigen-specific monoclonal antibodies cannot be produced from animal species for which plasma cell identification methods have not been established.
- an object of the present invention is to provide a technique for overcoming the above-mentioned drawbacks and efficiently producing antigen-specific monoclonal antibodies from a wide range of animal species.
- Another object of the present invention is to provide a new antigen-specific monoclonal antibody using the newly developed technique for producing an antigen-specific monoclonal antibody.
- B cells express antibodies on the cell membrane (membrane-type antibodies), and antigen binding to them causes class switching of immunoglobulin genes and somatic hypermutation, resulting in affinity for the antigen. Increased B cells are selected. Part of this high affinity B cell differentiates into a plasma cell and becomes an antibody-producing cell. With this differentiation, plasma cells are known to abolish the expression of membrane-type antibodies by selective splicing of immunoglobulin genes and to express secretory antibodies in large quantities (Immunological Reviews, Sarah A. Oracki, Jennifer A . Walker, Margaret L. Hibbs, Lynn M. Corcoran, David M. Tarlinton, Special Issue: B-Lymphocyte Biology, Volume 237, Issue 1, pages 140-159, September 2010: Which is specifically incorporated herein by reference)).
- the inventor In the process of analyzing rat, guinea pig and rabbit rabbit plasma cells, the inventor has newly found that the surface of plasma cells obtained from these animals expresses a quantity of membrane-type antibody molecules that can be analyzed for antigen binding. discovered. As a result, it was considered that antigen-specific plasma cells could be identified by directly binding the labeled antigen to the high-affinity membrane antibody expressed on the plasma cell surface. However, the amount of antibody molecules expressed on the plasma cell membrane is small, so even if there are plasma cells that specifically bind to the labeled antigen, antigen-specific plasma cells are not detected due to noise due to nonspecific adsorption of the labeled antigen. It was difficult to identify.
- antigen-specific plasma cells can be identified by a simple operation in which a fluorescently labeled antigen and an endoplasmic reticulum affinity fluorescent dye are allowed to act on a cell suspension solution prepared from an immunized animal. Completed the invention.
- the present invention is as follows. [1] Lymph, lymph tissue, blood cell sample or bone marrow-derived cells are collected from non-human animals, and the collected lymph, lymph tissue, blood cell sample or bone marrow-derived cells are sensitized in vitro to the target antigen, or non-human Immunize the animal with the antigen of interest, Collect lymph, lymph tissue, blood cell samples or bone marrow derived cells from non-human animals after immunization, Cells that are derived from the sensitized or collected lysate, lymphoid tissue, blood cell sample, or bone marrow, and (1) a labeled antigen of interest, and (2) a label that selectively binds to plasma cells and / or plasma blasts Mix with the substance, Selecting (1) the labeled target antigen and (2) a cell bound with the labeled substance, A method for selecting at least one of plasma cells and plasmablasts that specifically bind to an antigen of interest.
- Lymph fluid, lymph tissue, blood cell sample or bone marrow derived cells are collected from humans, and the collected lymph fluid, lymph tissue, blood cell sample or bone marrow derived cells are sensitized in vitro to the target antigen, or antibodies against the target antigen are administered.
- [3] Select at least one of plasma cells and plasmablasts that specifically bind to the target antigen by the method according to claim 1 or 2, Collect antibody genes against the target antigen from the selected cells, identify their base sequences, Preparing the antibody or antibody fragment based on the nucleotide sequence of the identified gene; A method for producing an antibody or antibody fragment specific for a target antigen.
- the labeling substance that selectively binds to plasma cells and / or plasma blasts is a fluorescent probe that has a high staining selectivity for the endoplasmic reticulum of cells compared to staining organelles other than the endoplasmic reticulum, A fluorescent probe for use in identification or isolation of plasma cells and / or plasmablasts, which can be distinguished from plasma cells and plasmablasts and cells other than plasma cells and plasmablasts by staining with a fluorescent probe.
- Item 4. The method according to any one of Items 1 to 3.
- [Five] Claims selected from the group consisting of (1) an amphipathic and cationic substance having moderate lipid solubility, and (2) a substance having a certain affinity for a protein exhibiting endoplasmic reticulum localization 4.
- the method according to 4. [6]
- the amphiphile has an amphipathic index (AI) of +6>AI> 0, and the medium lipophilicity has a hydrophobicity index (logP) of +6>logP> 0, which exceeds a certain level. 6.
- the organelle other than the endoplasmic reticulum is a plasma membrane, mitochondria, Golgi apparatus, lysosome, peroxome, nucleus, centrosome, cytoplasmic substrate, phagosome, endosome, or aggresome. the method of. [8] The method according to any one of claims 4 to 7, wherein the fluorescent probe is selected from the group consisting of fluorescently labeled glibenclamide, fluorescently labeled Brefeldin A, fluorescent probe, and fluorescent protein.
- Guinea pig against human insulin having the ⁇ chain variable region gene of the guinea pig antibody against human insulin represented by any one of SEQ ID NOs: 7 to 18 in the sequence listing or the amino acid sequence represented by any of SEQ ID NOs: 19 to 30 and 89 to 91 A gene encoding a peptide of the ⁇ chain variable region of an antibody.
- Guinea pig against human insulin having the gene of the kappa chain variable region of the guinea pig antibody against human insulin represented by any of SEQ ID NOs: 31 to 42 in the sequence listing or the amino acid sequence represented by any of SEQ ID NOs: 43 to 54 and 86 to 88 A gene encoding a peptide in the kappa chain variable region of an antibody.
- a peptide of the ⁇ chain variable region of a guinea pig antibody against human insulin having the amino acid sequence shown by any of SEQ ID NOs: 19-30 and 89-91.
- a peptide of the ⁇ chain variable region of a guinea pig antibody against human insulin having the amino acid sequence represented by any of SEQ ID NOs: 43 to 54 and 86 to 88.
- a guinea pig monoclonal antibody against human insulin having an amino acid sequence represented by any one of SEQ ID NOs: 19 to 30 and 89 to 91 as a variable region and a ⁇ chain having the amino acid sequence represented by SEQ ID NO: 4 as a constant region.
- a guinea pig monoclonal antibody against human insulin having the amino acid sequence shown by any of SEQ ID NOs: 43 to 54 and 86 to 88 as a variable region, and having a ⁇ chain having the amino acid sequence shown by SEQ ID NO: 5 as a constant region.
- a kappa chain containing a combination of any one of the following kappa chain CDR1, kappa chain CDR2 and kappa chain CDR3 or a gamma chain containing a combination of any one of the following gamma chain CDR1, gamma chain CDR2 and gamma chain CDR3 A guinea pig monoclonal antibody against human insulin.
- antigen-specific monoclonal antibodies can be rapidly produced from a wide range of animal species, thus providing new possibilities for the development of antibody drugs against target molecules that were difficult to produce using existing technologies. Is.
- FIG. 2 is a photograph of rat lymphocytes derived from iliac lymph nodes stained with a cell surface antibody and endoplasmic reticulum using an anti-rat IgG antibody (green, left figure) and ER-tracker, and observed with a fluorescence microscope. IgG expression was observed on the surface of ER-tracker strongly positive plasma cells (arrow).
- the result of Example 1 is shown. The results are obtained by staining rat lymphocytes derived from iliac lymph nodes using labeled GFP and ER-tracker, and then using a cell sorter.
- A is a two-dimensional analysis diagram of rat lymphocytes derived from iliac lymph nodes by the fluorescence intensity of GFP (vertical axis) and ER-tracker (horizontal axis).
- GFP positive and ER-tracker positive region (High) is shown as an antigen-specific plasma cell fraction, and a GFP negative and ER-tracker positive region (Low) is shown as a non-specific plasma cell fraction.
- B shows a fluorescence micrograph in which cells collected from the antigen-specific plasma cell fraction were fixed and subjected to membrane solubilization treatment, and FITC-labeled anti-rat IgG antibody was allowed to act on this to stain intracellular IgG.
- Example 1 The collected cells expressed intracellular immunoglobulins that are characteristic of plasma cells.
- CDNA was synthesized from the cells separated by the cell sorter, and the rat ⁇ chain and ⁇ chain variable region genes were amplified by 5′-RACE PCR using this as a template (K chain, G chain in the upper part of the figure).
- the amplified variable region was incorporated into a linearized expression vector to produce rat ⁇ chain and ⁇ chain immunoglobulin expression units.
- the results of agarose electrophoresis of the amplified DNA are shown (K expression unit, G expression unit at the bottom of the figure).
- the result of Example 1 is shown.
- FIG. 3 is a photograph of iliac lymph node-derived guinea pig lymphocytes stained with a cell surface antibody and an endoplasmic reticulum using an anti-guinea pig IgG antibody (green, left figure) and ER-tracker and observed with a fluorescence microscope. IgG expression was observed on the surface of ER-tracker strongly positive plasma cells (arrow). The result of Example 2 is shown.
- A shows two-dimensional guinea pig lymphocytes by fluorescence intensity when cells collected from guinea pig iliac lymph nodes are stained with fluorescently labeled human insulin (vertical axis) and ER-tracker (horizontal axis) and separated by cell sorter.
- the cells in the region indicated by R1 were used as the antigen-specific plasma cell fraction, and single cell sorting was performed.
- B cells obtained from the antigen-specific plasma cell fraction were fixed and subjected to membrane solubilization treatment, and FITC-labeled anti-guinea pig IgG antibody was allowed to act on this to stain intracellular IgG (green).
- the endoplasmic reticulum was stained with an endoplasmic reticulum affinity fluorescent dye ER-ID Red (red).
- Cell nuclei were stained with Hechst33342 (blue).
- the fractionated cells had intracellular immunoglobulins (green), characteristic of plasma cells, developed endoplasmic reticulum (red), and a nucleus that was biased toward one of the cells.
- Example 2 The result of Example 2 is shown. ⁇ and ⁇ chain variable region gene fragments were amplified from individual plasma cells isolated from the antigen-specific plasma cell fraction. A 1% agarose gel electrophoresis photograph of a typical amplification product is shown. G represents a guinea pig ⁇ variable region gene fragment, and K represents a ⁇ chain variable region gene fragment. The result of Example 2 is shown. 1 shows a 1% agarose gel electrophoresis photograph of linearized ⁇ chain and ⁇ chain expression units obtained by binding guinea pig ⁇ and ⁇ chain variable region gene fragments to respective linking double-stranded DNA fragments. G represents a linearized ⁇ chain expression unit, and K represents a ⁇ chain expression unit. The result of Example 2 is shown.
- Example 3 By introducing linearized ⁇ chain and ⁇ chain or ⁇ chain expression unit into 293FT cells, binding of recombinant antibody secreted into the medium to human insulin was shown.
- the horizontal axis shows the ability of human insulin to bind per ⁇ g of recombinant antibody.
- the result of Example 3 is shown.
- the results show that ovalbumin-positive and ER-tracker yangyang cells were present.
- the result of Example 3 is shown. It is the result of having performed the amplification reaction of the variable region of a rabbit immunoglobulin (kappa) chain gene using a primer (d) and a primer (ne). The result of Example 3 is shown.
- Example 3 It is the result of having confirmed conversion to the expression unit of (kappa) and (gamma) chain immunoglobulin gene fragment by the agarose gel electrophoresis method. The result of Example 3 is shown. It is the result of having investigated about the antigen binding ability of the recombinant rabbit monoclonal antibody obtained from the antigen-specific plasma cell and the non-specific plasma cell using ELISA method.
- the first aspect of the present invention is a method for selecting at least one of a plasma cell and a plasmablast that specifically bind to a target antigen.
- the first aspect of the present invention can be divided into two methods: a method for non-human animals (hereinafter referred to as NHA method) and a method for human subjects (hereinafter referred to as HU method).
- the NHA method for non-human animals is Lymph, lymph tissue, blood cell sample or bone marrow-derived cells are collected from non-human animals, and the collected lymph, lymph tissue, blood cell sample or bone marrow-derived cells are sensitized in vitro to the target antigen, or non-human Immunize the animal with the antigen of interest, Collect lymphatic fluid, lymphoid tissue, blood cell sample or bone marrow derived cells from animals after immunization, The sensitized or collected lymph fluid, lymphoid tissue, blood cell sample or bone marrow-derived cells, and (1) a labeled target antigen and (2) a plasma cell and / or a labeling substance that selectively binds to plasmablasts And mix Selecting (1) the labeled target antigen and (2) a cell bound with the labeled substance
- the HU method for humans is Lymph fluid, lymph tissue, blood cell sample or bone marrow derived cells are collected from humans, and the collected lymph fluid, lymph tissue, blood cell sample or bone marrow derived cells are sensitized in vitro to the target antigen, or antibodies against the target antigen are administered.
- Mix the substances Selecting (1) the labeled target antigen and (2) a cell bound with the labeled substance.
- the HU method at least one of human plasma cells and plasmablasts that specifically bind to the target antigen can be selected.
- non-human animal means all animals having an immune system other than human.
- mammals include ape, monkey, dog, cat, horse, cow, pig, sheep, goat, donkey, camel, llama, alpaca, reindeer, buffalo, yak, guinea pig, rabbit, mink, mouse, rat, gerbil Hamsters, golden hamsters, Armenian hamsters, ferrets, miniature pigs, raccoons, black rats, sunks, kangaroos, dolphins and the like.
- birds include chickens, quails or ostriches.
- the “target antigen” refers to microorganisms such as viruses, mycoplasma, bacteria, and molds, coronal animals such as shellfish, molting animals such as insects and crustaceans, new mouth animals such as vertebrates, and constituents thereof, Proteins, sugars, lipids, complex carbohydrates, nucleic acids, natural low molecular organic compounds, natural high molecular organic compounds, artificial low molecular organic compounds, artificial high molecular organic compounds, metal complexes, and the like.
- it is not intended to limit the type of target antigen and these are merely examples.
- the target antigen used for immunization of a non-human animal can be the target antigen as it is, but it can also be used as it is or in a state in which an organism containing the target antigen is killed or as an extract thereof, or an appropriate carrier. They can also be combined or mixed.
- ⁇ ⁇ ⁇ Collect lymph, lymph tissue, blood cell sample or bone marrow-derived cells from non-human animals, and sensitize the collected lymph, lymph tissue, blood cell sample or bone marrow-derived cells to the target antigen in vitro.
- Sensitization with the target antigen in vitro to lymph fluid and the like can be performed as follows. Dendritic cells, T cells, and B cells, which are antigen-presenting cells, are collected from non-human animals. Next, an antigen is allowed to act on a dendritic cell in a test tube to be phagocytosed and digested to produce a mature dendritic cell having the ability to present the antigen.
- T cells and B cells T cells and B cells, cytokines such as interleukin 2, and immunostimulants such as poly (dI-dC) are added, and B cells that respond to the antigen are proliferated and differentiated in vitro to finally produce antibodies. Plasma cells and plasmablasts are obtained.
- cytokines such as interleukin 2, and immunostimulants such as poly (dI-dC)
- immunostimulants such as poly (dI-dC)
- “immunizing a non-human animal with a target antigen” means bringing the target antigen into contact with the non-human animal and expressing immunity against the target antigen in the non-human animal.
- the method for expressing immunity to the target antigen is not particularly limited.
- a non-human animal can be immunized by administering or transplanting the target antigen to the non-human animal.
- the administration method or transplantation method of the target antigen include intraperitoneal administration, oral administration, subcutaneous injection, intravenous injection, intramuscular injection, or gene transfer into non-human animals. Examples thereof include a method of expressing in an animal body.
- the non-human animal can be immunized by bringing the target antigen into contact with the skin of the non-human animal.
- Immunization with a target antigen of a non-human animal is performed until immunization with the target antigen is established in the non-human animal. Therefore, the non-human animal is brought into contact with the target antigen until immunity with the target antigen is established.
- the frequency and duration of contact of the target antigen with the non-human animal and the amount of the target antigen used for one contact can be appropriately determined according to the ease of establishing immunity. Whether or not immunity with a target antigen is established in a non-human animal can be confirmed by a conventional method, for example, by collecting blood from the non-human animal and measuring the antibody contained in the serum by ELISA. .
- Lymph, lymph tissue, blood cell samples or bone marrow-derived cells are collected from the animal after immunization. Since the object of the present invention is to select at least one of plasma cells and / or plasmablasts of a non-human animal that specifically binds to the antigen of interest, the possibility of containing plasma cells and / or plasmablasts is high. Collect lymph, lymphoid tissue, blood cell samples or bone marrow derived cells.
- Plasma cells and plasma blasts are cells that are terminally differentiated B lymphocytes and specialized in antibody production. These cells are particularly useful for isolating antibodies with high binding ability because somatic mutation of antibody genes called affinity maturation and selection by antigen have already been performed.
- plasma cells and plasmablasts are heterogeneous cell populations composed of several subsets, and their presence in lymphoid tissues is as low as 0.1% or less, so that high-purity isolation is difficult.
- Conventional methods require several steps of positive / negative selection in combination with antibodies against at least three cell surface markers to identify and isolate plasma cells and plasmablasts from peripheral blood and lymph nodes. (Sanderson, R. D., Lalor, P., Bernfield, M. B lymphocytes express and lose syndecan at specific stages of differentiation: Cell Regulation 1: 27-35 (1989): Non-Patent Document 1 (all The description is specifically incorporated herein as disclosure)).
- the lymph, lymph tissue, blood cell sample or bone marrow can be prepared, for example, as follows.
- the swollen lymph fluid and lymph tissue are surgically removed from a non-human animal that has been injected with the antigen subcutaneously, muscle, or footpad for about one month.
- the cells inside the lymph node are in PBS solution (10 mM phosphate buffer, 120 mM NaCl, 2.7 mM KCl, pH 7.6) by breaking the lymph node membrane using tweezers.
- PBS solution 10 mM phosphate buffer, 120 mM NaCl, 2.7 mM KCl, pH 7.6
- As the blood cell sample mononuclear cells obtained by separating blood obtained by heparin blood collection from an immunized animal by density gradient centrifugation are used.
- Bone marrow is cut from both bone ends of the femur removed from the immunized animal, and PBS solution is allowed to flow into the bone marrow from an injection needle inserted into one bone end, so that bone marrow cells that have flowed out from the other bone end are removed. Use.
- ⁇ Selection of cells From the collected lymph nodes, at least one of plasma cells and plasmablasts of a non-human animal that specifically binds to the target antigen is selected. In order to perform this selection, (1) a labeled target antigen and (2) a labeling substance that selectively binds to plasma cells and / or plasmablasts are used.
- a labeled target antigen is a substance containing the same epitope as the target antigen used for immunization of a non-human animal. Therefore, the labeled target antigen and the target antigen used for immunization can be the same substance or different substances containing a common epitope.
- any label capable of selecting plasma cells and / or plasmablasts to which the labeled target antigen has been bound may be used.
- Examples of such a label include a fluorescent label and a magnetic bead label.
- a labeling substance that selectively binds to a target antigen and plasma cells and / or plasmablasts is a labeling substance that selectively binds to plasma cells and / or plasmablasts. As long as it can be distinguished from cells bound only to the antigen of interest and cells bound only to the labeling substance that selectively binds to plasma cells and / or plasma blasts.
- Labeling substance that selectively binds to plasma cells and / or plasmablasts examples include, for example, fluorescent probe 1 described below. Can do.
- Fluorescent probe 1 is a fluorescent probe for use in the identification or isolation of plasma cells and plasmablasts, and has a higher affinity for the endoplasmic reticulum than for other organelles, in other words, It is a fluorescent probe that selectively stains the endoplasmic reticulum of cells.
- Plasma cells and plasmablasts have abnormally developed endoplasmic reticulum compared to plasma cells and cells other than plasmablasts, and as a result, the fluorescence intensity obtained by staining with fluorescent probe 1 is as follows. Compared to the fluorescence intensity when cells other than plasmablasts are stained with the fluorescent probe 1, the difference is such that the plasma cells, plasmablasts and plasma cells, and cells other than plasmablasts can be distinguished.
- the fluorescence intensity ratio (fluorescence intensity of plasma cells and plasmablasts / fluorescence intensity of plasma cells and cells other than plasmablasts) shown by the fluorescent probe 1 is, for example, 3 times or more.
- plasma cells and plasmablasts in which cells other than plasma cells and plasmablasts coexist are obtained from fluorescence intensity and plasma cells and plasmablasts from plasma cells and cells other than plasmablasts. Both can be identified by the difference in intensity of the fluorescence intensity. Therefore, by staining with the fluorescent probe 1, it is possible to easily identify the plasma cell and the plasmablast from the cell group in which cells other than the plasma cell and the plasmablast coexist, and the identified plasma cell and plasmablast It is possible to obtain a cell group containing a large amount of plasma cells and plasmablasts.
- the fluorescent probe 1 can be distinguished from each other if the fluorescence intensity from the stained plasma cells and plasmablasts is at least three times the fluorescence intensity from the stained plasma cells and cells other than plasmablasts. From the viewpoint of facilitating identification, it is preferably 4 times or more, more preferably 5 times or more.
- this fluorescence intensity ratio varies depending on the types of cells other than plasma cells and plasmablasts, and the degree of development of the endoplasmic reticulum differs depending on the types of cells other than plasma cells and plasmablasts. The higher the fluorescence intensity ratio, the more efficiently the plasma cells and plasmablasts can be identified from the cell group including cells other than plasma cells and plasmablasts.
- cells other than plasma cells and plasmablasts include erythrocytes, platelets, T lymphocytes, B lymphocytes, granulocytes, macrophages, eosinophils, basophils, eosinophils, macrophages and the like.
- plasma cells using the fluorescent probe 1 and discrimination between plasmablasts and plasma cells and cells other than plasmablasts can be performed as follows. Fluorescent probe 1 is added to the cell suspension and stained at 37 ° C. for 30 minutes. The concentration of the fluorescent probe 1 suitable for staining varies depending on the type of the fluorescent probe 1, but is, for example, 100 nM to 1 ⁇ M. After staining, the cells are washed with PBS. The washed cells are, for example, (1) observing the localization of the fluorescent probe in the cells using a fluorescence microscope, or (2) plasma cells as well as plasmablasts based on the intensity of fluorescence emitted from the cells. Or cells other than plasma cells and plasmablasts. A method for distinguishing plasma cells and plasmablasts from plasma cells and cells other than plasmablasts will be described in detail in Plasma cells and plasmablast identification / separation methods.
- a substance that can be used as the fluorescent probe 1 can be screened from a substance with unknown staining selectivity. Screening of a fluorescent probe suitable as the fluorescent probe 1 of the present invention having high staining selectivity for the endoplasmic reticulum of cells is performed by immunostaining of proteins localized in the endoplasmic reticulum (immunoglobulin in plasma cells and plasmablasts), which will be described later.
- the ratio of the fluorescence intensity A of the whole cell to the fluorescence intensity B from the endoplasmic reticulum (B) using a method of identifying the endoplasmic reticulum of a cell by expressing a recombinant fluorescent protein that migrates to the endoplasmic reticulum in cultured cells. / A) can be used.
- the method for screening a substance that can be used as the fluorescent probe 1 can be carried out using only plasma cells and plasmablasts, or using only plasma cells and cells other than plasmablasts.
- plasma cells and plasmablasts have developed endoplasmic reticulum and high fluorescence intensity can be obtained by staining
- the use of plasma cells and plasmablasts has a higher selectivity for the staining of substances with respect to the endoplasmic reticulum of the cells. Evaluation is easier.
- it since it is not easy to obtain plasma cells and plasmablasts, it can be used as fluorescent probe 1 by evaluating the staining (staining power) to the endoplasmic reticulum using cells other than plasma cells and plasmablasts. Substances can also be screened.
- the ratio (B / A) of the fluorescence intensity A of the whole cell and the fluorescence intensity B from the endoplasmic reticulum is obtained.
- Available substances can be screened.
- the B / A value to be used as the threshold is determined according to the degree of endoplasmic reticulum development in the cells. It is appropriate to appropriately set a value lower than the B / A value as a threshold employed in the screening method, for example, about 50%.
- Examples of cells other than plasma cells and plasmablasts include erythrocytes, platelets, T lymphocytes, B lymphocytes, macrophages, neutrophils, eosinophils, and basophils as other cells.
- hybridoma cells, plasma cells and plasmablast tumor cells, or multiple myeloma cells can be used instead of plasma cells and plasmablasts. This is because hybridoma cells, plasma cells and plasma blast tumor cells, and multiple myeloma cells also develop the endoplasmic reticulum to produce immunoglobulins, so that high fluorescence intensity is obtained by staining. This is because it is easier to evaluate the staining selectivity of a substance with respect to the endoplasmic reticulum.
- Fluorescent probe 1 with high staining selectivity for plasma cells and plasma blast cells and plasma cells and the endoplasmic reticulum of cells other than plasma blast cells includes: (1) Amphiphilic and cationic, and moderate Examples thereof include a substance having fat solubility, and (2) a substance having a certain affinity for a protein showing localization of the endoplasmic reticulum.
- the substance having the property (1) or (2) has both the staining property to the endoplasmic reticulum of plasma cells and plasmablasts and the staining property to the endoplasmic reticulum of plasma cells and cells other than plasmablasts. Compared to other organelles, the staining is higher.
- amphipathic and cationic in (1) above specifically means that the amphipathic index (AI) is, for example, +6> AI> 0.
- the amphiphilic index is a value obtained by calculating the apparent logP value of the lipophilic domain of the molecule. Specifically, this is a value calculated according to the model of Morrall et al. Based on the fragment value of Hansch et al., Taking into account the carbon chain length and its positional relationship and the polar effect of the cationic quaternary ammonium group. [Hansch C, Leo AJ.
- “medium lipid solubility” means that the hydrophobic index (logP) is, for example, +6> logP> 0.
- the hydrophobicity index is the hydrophobicity value of the whole molecule calculated by the fragment estimation method of Hansch et al. Specifically, the influence of the structure attached to the hydrophobic group indicated by AI is added.
- “having a certain affinity for a protein showing endoplasmic reticulum localization” specifically means that the dissociation constant has an affinity of 0.1 ⁇ M to 0.1 nM.
- a substance having a certain affinity for a protein showing localization of the endoplasmic reticulum is also a fluorescent probe for selectively staining the endoplasmic reticulum of cells.
- Examples of substances that are amphipathic and cationic and have moderate fat solubility include compounds represented by A, B, or C below.
- the compound represented by Formula A is DiOC6 (3) (3,3'-dihexyloxacarbocyanine iodide), which accumulates in mitochondria at low concentrations, but accumulates in the endoplasmic reticulum at high concentrations.
- the compound represented by formula B is rhodamine B hexyl ester, which accumulates in mitochondria at low concentrations but accumulates in the endoplasmic reticulum at high concentrations.
- the compound represented by Formula C is ER-Tracker Blue white DPX, which mainly accumulates in the endoplasmic reticulum and also stains the Golgi apparatus at high concentrations. It is the fluorescent probe used in the Example. All of these compounds represented by A, B or C are amphipathic, cationic and moderately fat-soluble (see reference, Why fluorescent probes for endoplasmic reticulumare selective: an experimental and QSAR-modeling study).
- the amphiphilic index (AI) and hydrophobic index of the compound represented by A are 4.5 and 4.4, respectively, and have a monovalent cation.
- the amphiphilic index (AI) and hydrophobicity index of the compound represented by B are 4.8 and 5.9, respectively, and have a monovalent cation.
- the compound represented by C has an amphiphilic index (AI) and a hydrophobic index of 5.1 and 0.7, respectively, and has a monovalent cation. As shown in the Examples, the compound represented by C has a fluorescence intensity of 4 or more times higher than that when staining plasma cells and plasmablasts. is there.
- the dyes (Dye) 1, 5, 7 and 10 are amphiphiles that are cationic and moderately fat-soluble, and are examples of the fluorescent probe 1. These dyes are those described in US Application Publication US 2010/0068752 A1, the entire description of which is specifically incorporated herein by reference. These dyes can be synthesized based on the description of the above-mentioned US application publication, and some of them are commercially available.
- the amphiphilic index (AI) and hydrophobicity index of Dye 1 are 4.95 and 3.77, respectively, and have a monovalent cation.
- the amphiphilic index (AI) and the hydrophobic index of Dye 5 are 5.11 and 4.32, respectively, and have a monovalent cation.
- the amphiphilic index (AI) and hydrophobicity index of Dye 7 are 4.19 and 3.29, respectively, and have a monovalent cation.
- the dye (Dye) 10 has an amphiphilic index (AI) and a hydrophobic index of 4.25 and 5.71, respectively, and has a monovalent cation.
- the hydrophobic index of the dyes (Dye) 1, 5, 7 and 10 is calculated using two independent logP calculation indexes (logP (annlogp), logP (atomic6)) using CompuDrug's calculation software Pallas.
- LogP (combined) 0.863 ⁇ logP (annlogp) + 0.137 ⁇ logP (atomic6), which is the sum of values multiplied by a coefficient for enhancing the coincidence.
- the amphipathic index was calculated by excluding the phosphate group (P-0) from the value of logP (annlogp).
- Examples of substances having a certain affinity or higher for proteins showing localization of the endoplasmic reticulum include fluorescently labeled glibenclamide and fluorescently labeled Brefeldin® A.
- glibenclamide is a compound represented by the following formula, and trade names: ER-Tracker (registered trademark) Green (BODIPY (R) FL glibenclamide, ER-Tracker (registered trademark) Red, (BODIPY (R) TR glibenclamide is glibenclamide
- the glibenclamide compound is known to bind to sulphonylurea receptors of ATP-sensitive K + channels, which are abundant in the endoplasmic reticulum, and inhibit its action. Dissociation constant of glibenclamide to ATP-sensitive K + channel is 0.1 ⁇ 3.6nM.
- Brefeldin® A is a compound represented by the following formula, and trade name: BODIPY-brefeldin® A is commercially available as a compound in which a fluorescent dye (BODIPY) is bound to Brefeldin® A.
- BODIPY fluorescent dye
- Brefeldin A shows functional inhibition of Arf1 protein, a GTP-exchanging factor that acts in vesicle transport from the endoplasmic reticulum to the Golgi apparatus.
- the amount of fluorescent probe 1 added to lymph, lymphoid tissue, blood cell sample, or bone marrow can be appropriately determined in consideration of the sensitivity of the detector, the composition of the cell suspension, the staining time, etc.
- ER-Tracker Blue white DPX In this case, it can be in the range of 100 nM to 1 ⁇ M. However, it is not intended to be limited to this range.
- the lymph, lymph tissue, blood cell sample, or bone marrow stained with the fluorescent probe 1 identifies plasma cells and plasmablasts (or plasma cells and cells with high possibility of plasmablasts) based on fluorescence.
- the method for identifying plasma cells and plasmablasts includes (1) a method for observing the location of the fluorescent probe in the stained cells under a fluorescence microscope, and (2) a cell subjected to sputum staining. There is a method based on the fluorescence intensity emitted from.
- the method of observing the localization of a fluorescent probe in a cell using a fluorescence microscope is that the region of the endoplasmic reticulum contained in the cell is strongly stained (i.e., emits strong fluorescence).
- a cell in which the area ratio of the strongly stained endoplasmic reticulum region is about 65% or more can be identified as a plasma cell and a plasma blast.
- the fluorescence intensity of the entire cell is about 65% or more when the fluorescence intensity of the entire cell is 100%. It can also be identified as a blast.
- the fluorescence intensity occupied by the endoplasmic reticulum is about 65% of the fluorescence intensity from one whole cell, and 35% in other organelles (mitochondrion, Golgi apparatus, plasma membrane, etc.)
- the fluorescent dye migrates.
- the ratio of the fluorescence intensity of the whole cell to the fluorescence intensity from the endoplasmic reticulum is determined by culturing immunostaining of proteins localized in the endoplasmic reticulum (immunoglobulin in plasma cells and plasmablasts) and recombinant fluorescent proteins that migrate to the endoplasmic reticulum.
- proteins localized in the endoplasmic reticulum immunoglobulin in plasma cells and plasmablasts
- recombinant fluorescent proteins that migrate to the endoplasmic reticulum By expressing in a cell, it can be determined as follows using a method for identifying the endoplasmic reticulum of the cell.
- 293 cells are used to express recombinant fluorescent protein (red) in cultured cells, and the cells are stained with fluorescent probe 1 (for example, ER-Tracker Blue Blue White).
- fluorescent probe 1 for example, ER-Tracker Blue Blue White.
- A the fluorescence intensity of the fluorescent probe 1 in the whole cell and display it as A
- B the fluorescent probe in the region (endoplasmic reticulum) stained with the recombinant fluorescent protein (red)
- the fluorescence intensity of 1 is measured and displayed as B.
- the fluorescence intensity B corresponds to the amount of fluorescent probe 1 localized in the endoplasmic reticulum.
- the ratio of the fluorescence intensity B from the endoplasmic reticulum of the cell to the fluorescence intensity A from one whole cell can be expressed as B / A x 100 (%).
- B / A x 100 %.
- ER-tracker Blue / white intensity A occupying one whole cell and ER- in the region stained with immunoglobulin (green) (endoplasmic reticulum)
- the fluorescence intensity B of trackerBBlue / white was measured, the value of B / A x 100 was 65% or more.
- the fluorescent probe 1 has a fluorescence intensity obtained in plasma cells and plasmablasts as compared to the fluorescence intensity obtained in cells other than plasma cells and plasmablasts, for example, 3 times or more, preferably 4 times or more, More preferably, it is five times higher. Therefore, plasma cells and plasmablast candidates from the cells stained with the fluorescent probe 1 can be easily identified based on the fluorescence intensity using the above-described fluorescence scanner or the like.
- plasma cells and plasmablasts are candidates only The ratio of true plasma cells as well as plasma blasts contained in is increased.
- plasma cells and plasmablasts that show high fluorescence intensity compared to plasma cells and cells other than plasmablast cells but show relatively low fluorescence intensity below the reference fluorescence intensity ratio may be excluded. There is. Therefore, considering the characteristics of plasma cells and plasma blasts contained in the sample lymph, lymphoid tissue or blood cell sample, especially the degree of development of the endoplasmic reticulum, the criteria for selecting plasma cells and plasma blasts as candidates. It is preferable to select the fluorescence intensity ratio.
- the method of the present invention it is preferable to further collect (sort) candidate plasma cells and plasmablasts identified by the above method.
- the identified cells can be collected, for example, by sorting with a cell sorter. Identification of plasma cells and plasmablasts based on fluorescence and plasma cells identified as plasma cells and plasmablasts (or likely plasma cells and plasmablasts) based on fluorescence and plasma cell candidates Is sorted by a cell sorter.
- the cells can be selected and separated as a group of a plurality of cells, but preferably, the cells are individually selected and separated one by one.
- the cells selected here are cells that have binding properties to the target antigen, but the antibodies to the target antigens that each cell has are not necessarily the same, and the amino acid sequences of the antigen binding sites of each antibody are expected to be different. Is done. Accordingly, the same target antigen can be obtained by individually selecting and separating cells one by one and applying each cell one by one to the method for producing an antibody or antibody fragment specific for the target antigen described later. It is possible to obtain different monoclonal antibodies that specifically bind to.
- the cells selected by this method are cells that show binding to the target antigen and are likely to be plasma cells and / or plasmablasts. It is possible to select at least one of plasma cells and plasmablasts of the non-human animal to be bound.
- lymph, lymph tissue, blood cell sample or bone marrow-derived cells are collected from a human, and the collected lymph, lymph tissue, blood cell sample or bone marrow-derived cells are sensitized in vitro with a target antigen or cells.
- a target antigen such as collected lymph can be performed by the same method as described above. That is, dendritic cells, T cells, and B cells, which are antigen-presenting cells, are collected from humans.
- an antigen is allowed to act on a dendritic cell in a test tube to be phagocytosed and digested to produce a mature dendritic cell having the ability to present the antigen.
- T cells and B cells cytokines such as interleukin 2, and immunostimulants such as poly (dI-dC) are added, and B cells that respond to the antigen are proliferated and differentiated in vitro to finally produce antibodies. Plasma cells and plasmablasts are obtained.
- lymph fluids received from humans with antibodies more specifically, blood received from humans with antibodies against the target antigen, or lymph nodes removed by surgery for the purpose of disease treatment, etc.
- blood cells or lymphocytes are separated from blood or tissue provided by a human having an antibody against the target antigen, and (1) a labeled target antigen, and (2) a plasma cell and / or A labeling substance that selectively binds plasmablasts is mixed.
- the target antigen used for immunization, (1) the labeled target antigen, and (2) the labeling substance that selectively binds plasma cells and / or plasmablasts are the same as in the NHA method.
- selection of cells bound to (1) a labeled target antigen and (2) a labeling substance that selectively binds plasma cells and / or plasmablasts is the same as in the NHA method.
- a sample provided from a human having an antibody against the target antigen is used, at least one of human plasma cells and plasmablasts that specifically bind to the target antigen can be selected.
- the second aspect of the present invention is a method for producing an antibody or antibody fragment specific for a target antigen.
- At least one of plasma cells and plasmablasts that specifically bind to the target antigen in the method of the present invention is selected, Collect antibody genes against the target antigen from the selected cells, identify their base sequences, Preparing the antibody or antibody fragment based on the nucleotide sequence of the identified gene; It is a method including. By this method, an antibody or antibody fragment specific to the target antigen can be produced.
- the method for selecting at least one of plasma cells and plasmablasts that specifically bind to the target antigen in the method of the present invention is as described above.
- Antibody genes against the target antigen are collected from the selected cells, and their base sequences are identified.
- the selected cell is a cell that shows binding to the antigen of interest, and is a plasma cell or a plasmablast.
- antibody genes can be collected and identified by handling a group consisting of a plurality of these selected cells.
- antibody genes are collected from individual cells and their nucleotide sequences are identified. To do. This makes it possible to obtain different monoclonal antibodies that specifically bind to the same target antigen.
- a known method can be used for collecting antibody genes against the target antigen from the selected cells and identifying the base sequence.
- the method of collecting antibody genes against the target antigen and synthesizing cDNA from the collected antibody genes uses, for example, the methods described in WO2009 / 091048 (US2011 / 0020879A1, the entire description of which is specifically incorporated herein by reference) Furthermore, a method for cloning the synthesized cDNA is, for example, the homologous recombination method described in WO2009 / 110606, US2011 / 0117609A1 (the entire description of which is specifically incorporated herein by reference).
- identification of the base sequence of the synthesized cDNA can be carried out using a known DNA base sequence determination method, and the antibody against the target antigen can be identified by identifying the base sequence of the cDNA. Genes can be identified.
- a plurality of projecting enclosures are provided in alignment on one surface of a substrate, the projecting enclosure has at least one notch, and an inside thereof
- a space that can hold droplets and at least the surface of the substrate surface that holds the droplets is immobilized on magnetic beads using a reaction jig whose contact angle with pure water is in the range of 90 to 150 °.
- the magnet is moved from the surface opposite to the surface having the protruding enclosure of the substrate.
- It is a reaction method including performing reaction and / or washing by sequentially moving them.
- the substance immobilized on the magnetic beads can be used, for example, by using, for example, oligo dT having binding ability to mRNA in selected cells.
- the cDNA synthesis method is the reaction jig described above, wherein a reaction jig provided with at least two protruding enclosures in one column is used in the droplet holding space of the two protruding enclosures.
- the droplets of the cell lysis solution containing the surface tension reducing reagent and the cDNA synthesis solution are retained in this order, and the mRNA immobilized on the magnetic beads is retained in the droplet retaining space of the two protruding enclosures.
- the solution held in the substrate can be sequentially moved from the surface opposite to the surface having the protruding enclosure of the substrate using a magnet to obtain cDNA immobilized on the magnetic beads.
- the above cDNA synthesis method can be carried out, for example, by using a reaction jig provided with at least four protruding enclosures in one column.
- a reaction jig provided with at least four protruding enclosures in one column.
- droplets of the cell lysis solution, the mRNA washing solution, the cDNA synthesis solution, and the cDNA washing solution are respectively held in this order, and the magnetic
- the mRNA immobilized on the beads is sequentially moved to the solution held in the space of the four protruding enclosures using a magnet from the surface opposite to the side where the substrate protrusions are provided. Thereby, cDNA immobilized on the magnetic beads is obtained.
- the volume of the C-shaped projection space of the reaction jig used in the cDNA synthesis method is suitably in the range of 0.5 to 100 ⁇ L, for example.
- the cell lysis solution retained in the space of the first C-shaped protrusion is, for example, a solution of 3 ⁇ L in total containing 100 mM Tris HCl (pH 7.5), 500 mM LiCl, 1% lithium dodecyl sulfate 5 mM dithiothreitol. Can do.
- the mRNA washing solution held in the space of the second C-shaped protrusion can be a solution of 3 ⁇ L in total containing 10 mM Tris HCl (pH 7.5), 0.15 M LiCl, 0.1% lithium dodecyl sulfate.
- the washing solution for reverse transcription reaction held in the space of the third C-shaped protrusion is 50 mM Tris HCl (pH 8.3), 75 mM KCl, 3 mM MgCl 2 , 0.1% Triton X-100, 0.5 mM dNTP, 5 mM. It can be a 3 ⁇ L total solution containing DTT, 2 unit RNase inhibitor.
- the reverse transcription reaction solution retained in the space of the fourth C-shaped projection is 50 mM Tris HCl (pH 8.3), 75 mM KCl, 3 mM MgCl 2 , 0.1% Triton X-100, 0.5 mM dNTP, 5 mM DTT, A total volume of 3 ⁇ L containing 2 unit RNase inhibitor and 8 unit SuperScript III Reverse transcriptase can be used. However, these are examples and are not intended to be limited to these solutions.
- mRNA immobilized on magnetic beads There are no particular restrictions on the type or length of the mRNA. MRNAs derived from various organisms can be used. As the magnetic beads, for example, particles having a particle system of 2.8 ⁇ m and oligo dT25 covalently bonded to the surface can be used. Immobilization of mRNA on magnetic beads can be performed as follows.
- the mRNA immobilized on the magnetic beads is sequentially added to the solution (droplet) held in the space of the four C-shaped protrusions.
- the magnet for example, a small neodymium magnet can be used.
- Each droplet is allowed to stay for the time required for reaction or washing.
- the time required for the reaction or washing varies depending on the reaction conditions and washing conditions, but can be, for example, in the range of 1 second to 1 hour.
- the above reaction and washing can be performed at room temperature (room temperature), but the temperature can be adjusted as necessary. Furthermore, when the amount of droplets is small, the solvent in the solution may evaporate, so put the reaction jig in a sealed container and keep the humidity in the container constant to prevent the solvent from evaporating. Is preferred. In order to keep the humidity in the container constant, a container containing water or a suitable aqueous solution can coexist in the sealed container.
- the cDNA immobilized on the magnetic beads can be obtained by sequentially retaining and passing the mRNA immobilized on the magnetic beads in the solution (droplet) held in the space of the four C-shaped projections. .
- the obtained cDNA can be used in subsequent steps without being cut out from the magnetic beads. Specifically, the obtained cDNA can be subjected to the cloning method described below.
- a cloning method using the homologous recombination method described in WO2009 / 110606 is a homologous recombination method in which a PCR product containing a sequence of a target gene (antibody gene) having amplification primer sequences P1 and P2 at both ends, Homologous pair consisting of homologous recombination regions VP1 and VP2 consisting of base sequences homologous to the primer sequences P1 and P2 for PCR product amplification, and consisting of base sequences homologous to part T1 inside P1 Using a linearized vector having the recombination region VT1 on the terminal side of VP1 and / or the homologous recombination region VT2 consisting of a base sequence homologous to the partial sequence T2 inside P2 on the terminal side of VP2.
- T1 and T2 has a base sequence unique to the target gene
- the PCR product is subjected to homologous recombination reaction and inserted into the vector, and the target PCR product is specifically vectorized Recombinant DNA inserted into Methods including obtaining a method of using.
- a PCR product containing the sequence of the target gene (antibody gene) having the amplification primer sequences P1 and P2 at both ends can be obtained from the cDNA obtained above by the method described in WO2009 / 110606.
- a recombinant DNA molecule in which the target PCR product is specifically inserted into the vector is prepared, and then the obtained recombinant DNA molecule is amplified,
- the antibody gene can be cloned.
- the target gene (antibody gene) contained in the amplified recombinant DNA molecule (recombinant vector) is excised from the vector by, for example, restriction enzyme treatment and purified as necessary. Separation and purification of the target gene can be performed by conventional methods. Examples of the separation and purification of the target gene include gel extraction and column purification. The separated and purified target gene can be used for, for example, determination of a base sequence, incorporation into an expression vector, and functional analysis of the target gene.
- an antibody or antibody fragment Based on the nucleotide sequence of the identified gene, an antibody or antibody fragment is prepared. Preparation of an antibody or antibody fragment based on the nucleotide sequence of the identified gene can be performed using an antibody gene fragment prepared using the specific method for producing a DNA fragment described in WO2011 / 027808.
- a method for producing a ligated DNA fragment in which ligation DNA regions are ligated on both sides of a target gene comprising (1) to (4).
- the target gene is an antibody gene.
- a base sequence containing the target gene sequence in the center having regions that can associate with both ends, and the two regions capable of associating do not associate with each other And one or both regions have a unique base sequence in which at least a part of the base sequence is included in the target gene sequence, and has a protruding end of 1 nucleotide or more at the 3 ′ end of both associable regions Preparing a 3 ′ overhanging double stranded gene fragment, (2) preparing a ligation double-stranded DNA fragment containing a ligation DNA region in the center and having regions that can associate with both ends, (3-1) One associable region of the 3′-end protruding double-stranded gene fragment has a base sequence homologous to the associable region at one end of the linking double-stranded DNA fragment.
- the sequence on the terminal side to which the 3 ′ protruding end is added is the side that binds to the DNA region for ligation in one of the regions that can associate with the double-stranded DNA fragment for ligation, (3-2)
- the protruding end from one of the regions capable of associating in the 3′-end protruding double-stranded gene fragment does not have a chain extension function in the DNA synthesis reaction, (3-3)
- the other associateable region of the 3′-end protruding double-stranded gene fragment is composed of a base sequence homologous to the associateable region at the other end of the linking double-stranded DNA fragment.
- the sequence on the terminal side to which the 3 ′ protruding end is added is the side that binds to the DNA region for ligation in the other associateable region of the ligation double-stranded DNA fragment, (3-4)
- the protruding end from the other associateable region of the 3′-end protruding double-stranded gene fragment does not have a chain extension function in the DNA synthesis reaction, (4)
- the ligated DNA fragment is obtained by performing heat denaturation, reassociation and DNA synthesis reaction at least twice. Including, A method for producing a ligated DNA fragment.
- region 1 Assuming that one of the associable regions is “region 1” and the other associable region is “region 2”, the ligated DNA fragment is schematically represented as region 2—ligation DNA region—region 1 -Target gene-Region 2-DNA region for ligation-A DNA fragment having at least one sequence represented by region 1.
- the ligation DNA region comprises sequence A and sequence B as two ligation DNA regions;
- One of the regions capable of associating the 3′-end protruding double-stranded gene fragment has sequences P1 and T1 from the end side, and the other has sequences P2 and T2 from the end side, and at least of sequences T1 and T2
- One of the regions capable of associating the double-stranded DNA fragment for ligation has the sequences VP1 and VT1 from the terminal side, the other has the sequences VP2 and VT2 from the terminal side, and the sequences VP1 and VT1 are the sequences P1 and VT1.
- VT1 The ligated DNA fragment represented by VT1 is VT2-VP2 (T2-P2) -sequence B-sequence A-VP1-VT1 (P1-T1) -target gene-VT2-VP2 (T2-P2) -sequence B
- VP1-VT1 (P1-T1) means VT1-VP1 that is homologous to T1-P1.
- the sequence that does not have a chain extension function is a sequence that is non-homologous to the sequence adjacent to the VP2 of the sequence B.
- a sequence that does not have a chain extension function in the DNA synthesis reaction at the protruding end at the end is a non-homologous sequence when adjacent to VP1 of the sequence A.
- the protruding end is a sequence containing dideoxynucleotide at the 3 ′ end.
- the ligated DNA fragment produced by the method according to [1] as a template, the ligated DNA fragment so as to amplify at least one of the ligation DNA regions and the target gene sequence contained in the ligated DNA fragment.
- PCR is performed using a forward primer and a reverse primer that function in different ligation DNA regions contained in the DNA to produce a DNA fragment containing at least one ligation DNA region and all of the target gene sequence it can.
- a deoxynucleotide terminal is added to a double-stranded DNA fragment containing a target gene sequence and a polydeoxynucleotide.
- the method can further comprise obtaining a 3′-overhanging double-stranded gene fragment containing a target gene sequence by acting on a transferase.
- the double-stranded DNA fragment containing the sequence of the target gene has a sequence P1 and a sequence P2 at each end, has a sequence T1 in a part of the inside of the sequence P1, and has an inner side of the sequence P2.
- sequence T2 (In part, it has the sequence T2, and one or both of the sequences T1 and T2 have a base sequence unique to the target gene.)
- sequence T1 and T2 have a base sequence unique to the target gene, or one or both of the sequence P1 and the sequence P2 have a base sequence unique to the target gene.
- sequences P1 and P2 are independently 10 bases or more
- the target gene is an antibody gene
- the 3′-protruding double-stranded gene fragment includes a sequence derived from the antibody gene
- the linking double-stranded DNA fragment Alternatively, the region VP1 and the region VT1 in the linking double-stranded DNA fragment having the sequence A can have a sequence derived from or not derived from an antibody gene.
- the target gene is an antibody gene
- the 3′-protruding double-stranded gene fragment includes a sequence derived from the antibody gene
- the linking double-stranded DNA fragment Alternatively, the region VP2 and the region VT2 in the linking double-stranded DNA fragment having the sequence B can be sequences derived from or not derived from an antibody gene.
- An antibody can be produced using the ligated DNA fragment produced by the method described in [4] or [5].
- the method for producing an antibody using the obtained ligated DNA fragment can be carried out using a method such as the cationic liposome method.
- the antibody can be produced by introducing the ligated DNA fragment into a cell such as the 293T cell line and then culturing the cell to express the antibody gene.
- the present invention includes genes and peptides of the variable and constant regions of guinea pig antibodies against human insulin newly obtained using the above-described method of the present invention, as well as rumott monoclonal antibodies against human insulin.
- ⁇ chain constant region gene of guinea pig antibody against human insulin having the base sequence shown in SEQ ID NO: 1 in the sequence listing
- ⁇ chain constant region of guinea pig antibody against human insulin having the amino acid sequence shown in SEQ ID NO: 4
- a peptide of a ⁇ -chain constant region of a guinea pig antibody against human insulin having a gene encoding a peptide and the amino acid sequence represented by SEQ ID NO: 4.
- ⁇ chain constant variable region gene of guinea pig antibody against human insulin having the nucleotide sequence shown in SEQ ID NO: 7-18 in the sequence listing, ⁇ of guinea pig antibody against human insulin having amino acid sequence shown in SEQ ID NO: 19-30
- a peptide of a ⁇ chain variable region of a guinea pig antibody against human insulin having a gene encoding a chain variable region peptide and the nucleotide sequence shown in SEQ ID NOs: 19 to 30.
- a guinea pig monoclonal antibody against human insulin having the amino acid sequence represented by any of SEQ ID NOs: 19 to 30 as a variable region and the ⁇ chain having the amino acid sequence represented by SEQ ID NO: 4 as a constant region.
- a guinea pig monoclonal antibody against human insulin having the amino acid sequence shown by any of SEQ ID NOs: 43 to 54 as a variable region and having a ⁇ chain having the amino acid sequence shown by SEQ ID NO: 5 as a constant region.
- variable region and constant region genes and peptides of guinea pig antibodies against human insulin of the present invention refer to the description of Examples described later using known DNA and peptide preparation methods. Can be prepared.
- Example 1 Production of rat monoclonal antibody [Materials and methods] As immunized animals, Wistar rats were 6 weeks old. Antigen is GFP. For immunization, 50 ⁇ g of GFP was injected intramuscularly three times every other month on both sides of the rat ridge. After immunization, iliac lymph nodes were collected from rats. GFP was fluorescently labeled with Alexafluor488 and purified by gel filtration. The iliac lymph node-derived lymphocytes were suspended in a PBS-0.5% bovine serum albumin solution, GFP (0.5 ⁇ g / ml) was added, and the mixture was stirred at 4 ° C. for 30 minutes to label the cells with antigen.
- GFP 0.5 ⁇ g / ml
- the cells were centrifuged, suspended in DMEM medium, ER-Tracker (1 ⁇ M) was added thereto, and the mixture was allowed to stand at room temperature for 5 minutes to stain the endoplasmic reticulum. After washing the cells with PBS, the antigen-specific plasma cell fraction is GFP positive and ER-tracker strong positive cells, and the antigen non-specific plasma cell fraction is GFP negative and ER-tracker strong positive cells using a cell sorter. separated.
- Lymphocytes prepared from iliac lymph nodes were stained with anti-rat IgG (green) and ER-tracker and then observed with a fluorescence microscope. As a result, IgG expression was observed on the surface of plasma cells strongly positive for ER-tracker, although it was weak (FIG. 1).
- FIG. 2A High and Low in FIG. 2A.
- the isolated cells were fixed and solubilized with cell membranes, and stained with anti-rat antibodies. As a result, the fractionated cells expressed a large amount of antibody in their cytoplasm. (FIG. 2B).
- cDNA synthesis cDNA synthesis and immunoglobulin gene amplification were performed according to the method described in “Reaction jig and reaction method, and cDNA synthesis method” (WO2009 / 091048) (FIG. 3).
- mRNA washing solution A 10 mM TrisHCl (pH 7.5), 0.15 M LiCl, 0.1% LiDS
- mRNA washing solution B 75 mM KCl, 3 mM MgCl 2
- Triton X 0.1% Triton X
- 0.5 mM dNTP 0.5 mM dNTP
- 5 mM DTT 2 unit RNase inhibitor
- cDNA synthesis solution 50 mM Tris HCl (pH 8.3), 75 mM KCl, 3 mM MgCl2, 0.1% Triton X-100, 0.5 mM dNTP, 5 mM DTT, 2 unit RNase inhibitor, 10 unit SuperScriptllll Reversesetripase (Invitrogen) was added and reacted for 1 hour at 37 ° C.
- 3 ⁇ L of 3 ′ tailing washing solution 50 mM potassium phosphate (pH 7.0), 0.5 mM dGTP, 0.1% Triton X was added to the magnetic beads.
- PCR reaction solution (primer 0.2 ⁇ M each, dNTP 0.2 mM, Takara Bio PrimeSTAR thermostable DNA polymerase 1U) was added to the magnetic beads, and the reaction was performed at 94 ° C. for 30 seconds to 68 ° C. for 40 seconds. 35 cycles were performed.
- the primer used was (a) and annealed to poly G added to the 3 ′ end of cDNA by TdT.
- the primer sequence is (A) and is derived from the constant region of the rat immunoglobulin ⁇ chain gene.
- the primer sequence is (c) and is derived from the constant region of the rat immunoglobulin ⁇ chain gene.
- variable region of the rat immunoglobulin ⁇ chain gene An amplification reaction was performed. Similarly, amplification reaction of the variable region of rat immunoglobulin kappa chain gene was performed using primer (d) and primer (f).
- the primers used were 1st PCR sense primer 5-GCTAGCGCTACCGGACTCAGATCCCCCCCCCCCDN-3 (A) (SEQ ID NO: 55) Antisense primer for 1st PCR ⁇ chain amplification 5- GCAGGTGACGGTCTGGCTGGRCCAGGTGCTGGA-3 (I) (SEQ ID NO: 56) Antisense primer for first PCR ⁇ chain amplification 5- TCGTTCAGTGCCATCAATCTTCCACTTGAC-3 (U) (SEQ ID NO: 57) Sense primer for second PCR amplification 5-CGCTAGCGCTACCGGACTCAGATCCC-3 (d) (SEQ ID NO: 58) Antisense primer for second PCR gamma chain amplification 5- CTGCAGGACAGCTGGGAAGGTGTGCAC-3 (e) (SEQ ID NO: 59) Antisense primer for second PCR ⁇ chain amplification 5- TAACTGTTCCGTGGATGGTGGGAAGAT-3 (F) (SEQ ID NO: 60) After the
- rat immunoglobulin linearized expression vector Preparation of rat immunoglobulin linearized expression vector
- rat ⁇ -chain gene and ⁇ -chain gene expression unit was prepared according to the method of “Specific method for producing a linked DNA fragment containing a target gene-derived sequence” (WO2011 / 027808). did. That is, 2 units of terminaldeoxynucleotidyltransferase was added to 1 ⁇ L of each PCR product amplified by the 5′-RACE-PCR method, reacted at 37 ° C. for 30 minutes, and then heated at 94 ° C. for 5 minutes to stop the enzyme reaction. .
- a rat ⁇ chain gene expression unit was prepared by adding a rat ⁇ chain gene double-stranded DNA fragment to the rat ⁇ chain gene solution and performing a reaction.
- 5-AGAGAAACCGTCTATCAGGGCGATGGC-3 (ki) (SEQ ID NO: 61)
- 5-AGAGACCCTTTGACGTTGGAGTCCACG-3 (ku)
- SEQ ID NO: 62 After the reaction, 1 ⁇ L each of the PCR solution was taken, and the conversion of ⁇ and ⁇ chain immunoglobulin gene fragments into expression units was confirmed by agarose gel electrophoresis (see the lower part of FIG. 3). Double-stranded DNA fragment for gene ligation
- the double-stranded DNA fragment for ligation of rat ⁇ -chain gene consists of rat ⁇ -chain constant region (1-873) ligation sequence II (1-54), poly A addition signal (1045-1051), CMV promoter (1577-2172), ligation It consists of sequence 1 (2173-2201) (SEQ ID NO: 63).
- Double-stranded DNA fragment for gene ligation comprises rat ⁇ chain constant region (1-325), ligation sequence II (1-53), poly A addition signal (507-513), It consists of a CMV promoter (1038-1633) and linking sequence 1 (1634-1662) (SEQ ID NO: 64).
- the full-length rat ⁇ chain and ⁇ chain gene expression units amplified in the above experiment were introduced into 293FT cells and cultured for 2 days to secrete recombinant rat antibodies in the cell culture medium.
- Antigen-binding ability of recombinant rat monoclonal antibodies obtained from antigen-specific plasma cells and non-specific plasma cells was examined using ELISA (FIG. 4).
- Recombinant rats obtained from antigen-specific plasma cells were examined.
- As for the monoclonal antibody 9 out of 12 clones showed strong binding force to GFP. In contrast, only 1 out of 12 recombinant rat monoclonal antibodies obtained from all plasma cell fractions showed strong binding to GFP.
- antigen-specific plasma cells can be identified by high-efficiency production of antigen-specific rat monoclonal antibodies by simply allowing the labeled antigen and ER-tracker to act on the lymphocyte suspension. It became clear that this is possible.
- Example 2 Production of Anti-Human Insulin Guinea Pig Monoclonal Antibody Insulin binds to insulin receptors present on the cell surface of liver, muscle and adipose tissue, and regulates the energy metabolism in the body by controlling glucose uptake into cells. It is an important hormone that plays a regulatory role. The measurement of blood insulin concentration is extremely important in grasping the pathological conditions such as diabetes and obesity. Since the structure of mammalian insulin has high homology except for guinea pigs, it is difficult to produce monoclonal antibodies using mice. For this reason, polyclonal antibodies obtained from guinea pig serum have been used to measure the blood concentration of human insulin.
- an anti-human insulin guinea pig monoclonal antibody was prepared using the present invention.
- the immunized animals used were 6 weeks old guinea pigs.
- the antigen is human insulin.
- 50 ⁇ g of human insulin was injected intramuscularly 4 times every other month on both sides of the guinea pig tail.
- iliac lymph nodes were collected from guinea pigs. Insulin was fluorescently labeled with Alexafluor594 and purified by gel filtration.
- [result] Lymphocytes were suspended from the iliac lymph nodes in PBS-0.5% bovine serum albumin solution, and then a fluorescent dye-labeled anti-guinea pig antibody was added and stirred at 4 ° C. for 30 minutes. The cells were centrifuged, suspended in DMAM medium, ER-Tracker (1 ⁇ M) was added thereto, and the mixture was allowed to stand at room temperature for 5 minutes. The endoplasmic reticulum was stained and observed with a fluorescence microscope. As a result, IgG expression was observed on the surface of plasma cells strongly positive for ER-tracker (FIG. 5).
- the iliac guinea pig lymphocyte suspension was stained with Alexafluor594-labeled insulin and ER-tracker and analyzed with a flow cytometer.
- a labeled insulin-positive and ER-tracker strong cell group was present (R1 in FIG. 6). This was defined as an antigen-specific plasma cell fraction.
- cDNA synthesis cDNA synthesis and immunoglobulin gene amplification were performed according to the method described in "Reaction jig and reaction method, and cDNA synthesis method" (WO2009 / 091048).
- mRNA for washing mRNA 10 mM TrisHCl (pH 7.5), 0.15 M LiCl, 0.1% LiDS
- mRNA washing solution B 75 mM KCl, 3 mM MgCl 2.
- 0.1% Triton X 0.1% Triton X, 0.5 mM dNTP, 5 mM DTT, 2 unit RNase inhibitor
- cDNA synthesis was performed.
- cDNA synthesis solution 50 mM Tris HCl (pH 8.3), 75 mM KCl, 3 mM MgCl 2 , 0.1% Triton X-100, 0.5 mM dNTP, 5 mM DTT, 2 unit RNase inhibitor, 10 unit SuperScriptll Reversesetripase (Invitrogen) was added and reacted for 1 hour at 37 ° C.
- 3 ⁇ L of 3 ′ tailing washing solution 50 mM potassium phosphate (pH 7.0), 0.5 mM dGTP, 0.1%) was added.
- the primer used was (a) and annealed to poly G added to the 3 ′ end of cDNA by TdT.
- the primer sequence is (K) and is derived from the constant region of the guinea pig immunoglobulin ⁇ chain gene.
- the primer sequence is (ko) and is derived from the constant region of the guinea pig immunoglobulin ⁇ chain gene.
- the primer sequence is (sa) and is derived from the constant region of the guinea pig immunoglobulin ⁇ chain gene.
- variable region of the rat immunoglobulin ⁇ chain gene An amplification reaction was performed. Similarly, amplification reaction of the variable region of rat immunoglobulin kappa chain gene was performed using primer (d) and primer (s). Similarly, amplification reaction of the variable region of rat immunoglobulin ⁇ chain gene was performed using primer (d) and primer (se) (FIG. 7).
- the primers used were Antisense primer for 1st PCR ⁇ chain amplification 5-GGTGCTGCTGGCCGGGTGGGCTACATTGCA-3 (K) (SEQ ID NO: 65) Antisense primer for first PCR ⁇ chain amplification 5-CAGAGCCATCCACCTTCCACTTGACGG-3 (co) (SEQ ID NO: 66) Antisense primer for first PCR ⁇ chain amplification 5-CTGCTGGCCATGTATTTGTTGTCGCTCTG-3 (sa) (SEQ ID NO: 67) Sense primer for second PCR amplification 5-CTGAAGGACGGCCGGGAAGGTGTGCAC-3 (si) (SEQ ID NO: 68) Antisense primer for second PCR ⁇ chain amplification 5-GGAAGAGGGAGATAGTTGGCTTCTGCACACTC-3 (su) (SEQ ID NO: 69) Antisense primer for second PCR ⁇ chain amplification 5-AGAAGGAATTCAGGAGACACACCACTGT-3 (se) (SEQ ID NO
- the cDNA prepared from guinea pig spleen cells was used to clone the guinea pig ⁇ chain gene constant region, ⁇ chain gene constant region and ⁇ chain gene constant region, The sequence was determined. Specifically, 3 ⁇ L of cell lysate containing 3 ⁇ g of magnetic beads (Dynapies) bound to oligo dT25 was added to guinea pig spleen cells (100 mM TrisHCl (pH 7.5), 500 mM LiCl, 1% dodecyl sulfate Li (LiDS), 5 mM).
- mRNA washing solution B 75 mM KCl, 3 mM MgCl 2.
- Triton X 0.5 mM dNTP, 5 mM DTT, 2 unit RNase inhibitor
- cDNA synthesis solution 50 mM Tris HCl (pH 8.3), 75 mM KCl, 3 mM MgCl 2 , 0.1% Triton X-100, 0.5 mM dNTP, 5 mM DTT, 2 unit RNase inhibitor, 10 unit SuperScriptll Reversesetriptase (Invitrogen) was added and reacted at 37 ° C. for 1 hour.
- primer (So) and (Ta) for ⁇ chain constant region primer (h) and (tu) for ⁇ chain constant region
- primer (te) and (g) The ⁇ chain constant region was amplified.
- Gamma chain constant region amino acid sequence (SEQ ID NO: 4) CLVKGYFPEPVTVKWNSGALTSGVHTFPAVLQSGLYSLTSMVTVPSSQKKATCNVAHPASSTKVDKTVEPIRTPQPNPCTCPKCPPPENLGGPSVFIFPPKPKDTLMISLTPRVTCVVVDVSQDEPEVQFTWFVDNKPVGNAETKPRVEQYNTTFRVESVLPIQHQDWLRGKEFKCKVYNKALPAPIEKTISKTKGAPRMPDVYTLPPSRDELSKSKVSVTCLIINFFPADIHVEWASNRVPVSEKEYKNTPPIEDADGSYFLYSKLTVDKSAWDQGTVYTCSVMHEALHNHVTQKAISRSPG
- Kappa chain constant region sequence GGGACCAAGCTGGAAATCAAACGGAGTGTGCAGAAGCCAACTATCTCCCTCTTCCCTCCATCATCTGAGGAGGTGACAGCTGGAAGTGCCTCAGTTGTGTGCTTCATTAATAGCTTCTATCCAAGAGACATCACCGTCAAGTGGAAGGTGGATGGCTCTGAACGCTCACAAGGCATCCTGAACAGTTACACAGATCAGGACAGCAAGGACAACACCTACAGCCTCAGTAGCACCCTGGCGCTGACGGCTTCAGAGTACAATCAGCATGAGAGGTACACCTGCGAGGTCTCCCACGCTGGCCTGACCTCACCCGCTGCCAAGACCATCAACAGGAGCGAGTGCTAGCTAG
- the guinea pig ⁇ chain gene, ⁇ chain gene, and ⁇ chain gene expression unit was prepared according to the method described in “Specific method for producing a ligated DNA fragment containing a target gene-derived sequence” (WO2011 / 027808). That is, 2 units of terminaldeoxynucleotidyltransferase was added to 1 ⁇ L of each PCR product amplified by the 5′-RACE-PCR method, reacted at 37 ° C. for 30 minutes, and then heated at 94 ° C. for 5 minutes to stop the enzyme reaction. It was.
- a guinea pig ⁇ chain gene expression unit was prepared.
- a guinea pig ⁇ chain gene expression unit was prepared by adding a double-stranded DNA fragment for ligation of guinea pig ⁇ chain genes to the guinea pig ⁇ chain gene solution.
- a guinea pig lambda chain gene expression unit was prepared by adding a guinea pig lambda chain gene double-stranded DNA fragment for ligation to a guinea pig lambda chain gene solution.
- the double-stranded DNA fragment for ligation of guinea pig ⁇ chain gene includes guinea pig ⁇ chain constant region (1-911), linking sequence II (1-96), poly A addition signal (912-1118), CMV promoter (1628-2093), Consists of linking sequence 1 (2094-2123) (SEQ ID NO: 77).
- the double-stranded DNA fragment for ligation of guinea pig ⁇ chain gene is the guinea pig ⁇ chain constant region (1-345), It consists of linking sequence II (1-55), poly A addition signal (346-548), CMV promoter (1058-1652), linking sequence 1 (1653-1682) (SEQ ID NO: 78).
- the double-stranded DNA fragment (sequence) for ligation of guinea pig ⁇ chain gene consists of guinea pig ⁇ chain constant region (1-272), ligation sequence II (1-52), poly A addition signal (53-410), CMV promoter (985- 1579), consisting of linking sequence 1 (1580-1609) (SEQ ID NO: 79).
- the full-length guinea pig ⁇ chain, ⁇ chain, and ⁇ chain gene expression units amplified in the above experiment were introduced into 293FT cells and cultured for 2 days to secrete the recombinant guinea pig antibody into the cell culture medium.
- the human insulin binding ability of recombinant guinea pig monoclonal antibodies obtained from antigen-specific plasma cells and non-specific plasma cells was examined by ELISA (FIG. 9). As a result, among 241 monoclonal antibodies obtained from antigen-specific plasma cells, 146 clones showed 10 times the insulin binding ability of the negative control, and 77 clones showed 50 times the strong binding ability of the negative control.
- antigen-specific plasma cells can be identified and antigen-specific monoclonal antibodies can be produced from these by simply applying labeled antigen and ER-tracker to the lymphocyte suspension. It became clear that this is possible.
- FR1, CDR1, FR2, CDR2, FR3, CDR3, and FR4 of the ⁇ chain and ⁇ chain constant variable regions of the guinea pig antibody against human insulin were determined using homology with human immunoglobulin variable regions, respectively.
- the amino acid sequences of ⁇ chain and ⁇ chain FR1-4 and CDR1-3 of the resulting guinea pig monoclonal antibodies 12 are shown in the following table.
- [result] Lymphocytes were suspended from the iliac lymph node in a PBS-0.5% bovine serum albumin solution, Alexafluor488 fluorescently labeled ovalbumin was added, and the mixture was stirred at 4 ° C. for 30 minutes.
- the cells were centrifuged and resuspended in PBS, ER-Tracker (1 ⁇ M) was added to the cells, and the cells were left at room temperature for 5 minutes to stain the endoplasmic reticulum and analyzed with a flow cytometer. As a result, there was a cell group positive for ovalbumin and ER-tracker strong (FIG. 10). This was defined as an antigen-specific plasma cell fraction.
- cDNA synthesis cDNA synthesis and immunoglobulin gene amplification were performed according to the method described in "Reaction jig and reaction method, and cDNA synthesis method" (WO2009 / 091048).
- mRNA washing solution A 10 mM TrisHCl (pH 7.5), 0.15 M LiCl, 0.1% LiDS
- mRNA washing solution B 75 mM KCl, 3 mM MgCl2
- Triton X 0.5 mM dNTP, 5 mM DTT, 2 unit RNase inhibitor
- cDNA synthesis solution 50 mM Tris HCl (pH 8.3), 75 mM KCl, 3 mM MgCl 2, 0.1% Triton X-100, 0.5 mM dNTP, 5 mM DTT, 2 unit RNase inhibitor, 10 unit SuperScriptllll Reversesetripase (Invitrogen) was added and reacted for 1 hour at 37 ° C.
- 3 ⁇ L of 3 ′ tailing washing solution 50 mM potassium phosphate (pH 7.0), 0.5 mM dGTP, 0.1% Triton X was added to the magnetic beads.
- 3 ′ tailing reaction solution 50 mM potassium phosphate (pH 7.0), 0.5 mM dGTP, 0.1% Triton X-100, 4 mM magnesium chloride, terminal deoxynucleotidyltransferase 10 U was added, and the reaction was performed at 37 ° C. for 30 minutes.
- Amplification of rabbit ⁇ and ⁇ chain variable region gene fragments After washing magnetic beads with 3 ⁇ L of TE solution (10 mM TrisHCl (pH 7.5), 1 mM EDTA, 0.1% Triton X-100), 5′-RACE PCR was performed. The human immunoglobulin ⁇ chain and ⁇ chain genes were amplified. In the first PCR reaction, 25 ⁇ L of PCR reaction solution (primer 0.2 ⁇ M each, dNTP 0.2 mM, Takara Bio PrimeSTAR thermostable DNA polymerase 1U) was added to the magnetic beads, and the reaction was performed at 94 ° C. for 30 seconds to 68 ° C. for 40 seconds. 35 cycles were performed.
- the primer used was (a) and annealed to poly G added to the 3 ′ end of cDNA by TdT.
- the primer sequence is (na)) and is derived from the constant region of the rabbit immunoglobulin ⁇ chain gene.
- the primer sequence is (d) and is derived from the constant region of the rabbit immunoglobulin ⁇ chain gene.
- variable region of the rabbit immunoglobulin ⁇ chain gene An amplification reaction was performed. Similarly, amplification reaction of the variable region of rabbit immunoglobulin kappa chain gene was performed using primer (d) and primer (ne). (FIG. 11).
- the primers used were Antisense primer for 1st PCR ⁇ chain amplification 5-GCTGGCTGCTTGAGGTCACGCTCACCAC-3 (Na) (SEQ ID NO: 80) Antisense primer for first PCR ⁇ chain amplification 5- CAGTTGTTTGGGTGGTGCCATCCAC-3 (D) (SEQ ID NO: 81) Antisense primer for second PCR gamma chain amplification 5- CTGCCGGACGGACGGGAAGGTGCGTAC-3 (nu) (SEQ ID NO: 82) Antisense primer for second PCR ⁇ chain amplification 5- ACACACGATGGTGACTGTTCCAGTTG-3 (ne) (SEQ ID NO: 83)
- rabbit ⁇ chain gene and ⁇ chain gene expression unit was prepared according to the method of “Specific production method of linked DNA fragment containing target gene-derived sequence” (WO2011 / 027808) did. That is, 2 units of terminaldeoxynucleotidyltransferase was added to 1 ⁇ L of each PCR product amplified by the 5′-RACE-PCR method, reacted at 37 ° C. for 30 minutes, and then heated at 94 ° C. for 5 minutes to stop the enzyme reaction. .
- the double-stranded DNA fragment for ligation of rabbit ⁇ chain gene consists of rabbit ⁇ chain constant region (1-893) ligation sequence II (1-93), poly A addition signal (1065-1071), CMV promoter (1606-2195), ligation It consists of sequence
- Double-stranded DNA fragment for gene ligation The double-stranded DNA fragment for ligation of rabbit ⁇ chain gene consists of rabbit ⁇ chain constant region (1-312), ligation sequence II (1-95), poly A addition signal (507-513), It consists of CMV promoter (1050-1633) and linking sequence 1 (1640-1675) (SEQ ID NO: 85).
- the full-length rabbit ⁇ chain and ⁇ chain gene expression units amplified in the above experiment were introduced into 293FT cells and cultured for 2 days to secrete the recombinant rabbit antibody in the cell culture medium.
- the antigen-binding ability of recombinant rabbit monoclonal antibodies obtained from antigen-specific plasma cells and non-specific plasma cells was examined using ELISA (FIG. 13). Recombinant rabbits obtained from antigen-specific plasma cells were examined.
- the monoclonal antibody showed a strong binding force to ovalbumin.
- antigen-specific plasma cells can be identified by high-efficiency production of antigen-specific rabbit monoclonal antibodies by simply applying labeled antigen and ER-tracker to the lymphocyte suspension. It became clear that this is possible.
- the present invention is useful in the field related to antibody production.
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Abstract
Description
[1]
非ヒト動物からリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を目的抗原にin vitroで感作させるか、または、非ヒト動物を目的抗原で免疫し、
免疫成立後の非ヒト動物からリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、
前記感作させた、または採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞と、(1)標識した目的抗原、および(2)形質細胞および/または形質芽細胞に選択的に結合する標識物質とを混合し、
前記(1)標識した目的抗原および(2)標識物質が結合した細胞を選択することを含む、
目的抗原に特異的に結合する形質細胞および形質芽細胞の少なくとも一方を選択する方法。
[2]
ヒトからリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を目的抗原にin vitroで感作させるか、または目的抗原に対する抗体を有するヒトからリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、
前記感作させた、または採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞と、(1)標識した目的抗原と(2)形質細胞および/または形質芽細胞を選択的に結合する標識物質を混合し、
前記(1)標識した目的抗原および(2)標識物質が結合した細胞を選択することを含む、
目的抗原に特異的に結合するヒトの形質細胞および形質芽細胞の少なくとも一方を選択する方法。
[3]
請求項1または2に記載の方法で目的抗原に特異的に結合する形質細胞および形質芽細胞の少なくとも一方の細胞を選択し、
選択した細胞から目的抗原に対する抗体遺伝子を採取し、その塩基配列を同定し、
同定した遺伝子の塩基配列に基づいて前記抗体または抗体の断片を調製する、
ことを含む目的抗原に特異的な抗体または抗体の断片の製造方法。
[4]
形質細胞および/または形質芽細胞に選択的に結合する標識物質が、細胞の小胞体に対する染色選択性が、小胞体以外の細胞小器官に対する染色選択性に比べて高い蛍光プローブであって、該蛍光プローブによる染色により、形質細胞及び形質芽細胞と形質細胞及び形質芽細胞以外の細胞とを識別可能な、形質細胞及び/又は形質芽細胞の同定又は単離に用いるための蛍光プローブである請求項1~3のいずれか1項に記載の方法。
[5]
(1)両親媒でカチオニックであり、かつ中程度の脂溶性を有する物質、および(2)小胞体局在を示すタンパク質に対して一定以上の親和性を有する物質から成る群から選ばれる請求項4に記載の方法。
[6]
前記両親媒は、両親媒性インデックス(AI)が、+6>AI>0であり、中程度の脂溶性は、疎水性インデックス(logP)が、+6>logP>0であり、一定以上の親和性は、解離定数が0.1μM~0.1nMの範囲である請求項5に記載の方法。
[7]
前記小胞体以外の細胞小器官が、形質膜、ミトコンドリア、ゴルジ体、リソソーム、パーオキソーム、核、中心体、細胞質基質、ファゴソーム、エンドソーム、又はアグリソームである請求項4~6のいずれか1項に記載の方法。
[8]
前記蛍光プローブが、蛍光標識glibenclamide、蛍光標識Brefeldin A、蛍光プローブ、および蛍光タンパク質から成る群から選ばれる請求項4~7のいずれか1項に記載の方法。
[9]
配列表の配列番号1で示されるヒトインスリンに対するモルモット抗体のγ鎖定常領域の遺伝子または配列表の配列番号4で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域のペプチドをコードする遺伝子。
[10]
配列表の配列番号2で示されるヒトインスリンに対するモルモット抗体のκ鎖定常領域の遺伝子または配列表の配列番号5で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域のペプチドをコードする遺伝子。
[11]
配列表の配列番号3で示されるヒトインスリンに対するモルモット抗体のλ鎖定常領域の遺伝子または配列表の配列番号6で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域のペプチドをコードする遺伝子。
[12]
配列表の配列番号4で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域のペプチド。
[13]
配列表の配列番号5で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域のペプチド。
[14]
配列表の配列番号6で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域のペプチド。
[15]
配列表の配列番号7~18のいずれかで示されるヒトインスリンに対するモルモット抗体のγ鎖可変領域の遺伝子または配列番号19~30及び89~91のいずれかで示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖可変領域のペプチドをコードする遺伝子。
[16]
配列表の配列番号31~42のいずれかで示されるヒトインスリンに対するモルモット抗体のκ鎖可変領域の遺伝子または配列番号43~54及び86~88のいずれかで示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖可変領域のペプチドをコードする遺伝子。
[17]
配列番号19~30及び89~91のいずれかで示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖可変領域のペプチド。
[18]
配列番号43~54及び86~88のいずれかで示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖可変領域のペプチド。
[19]
可変領域として配列番号19~30及び89~91のいずれかで示されるアミノ酸配列を有し、かつ定常領域として配列番号4で示されるアミノ酸配列を有するγ鎖を有する、ヒトインスリンに対するモルモットモノクローナル抗体。
[20]
可変領域として配列番号43~54及び86~88のいずれかで示されるアミノ酸配列を有し、かつ定常領域として配列番号5で示されるアミノ酸配列を有するκ鎖を有する、ヒトインスリンに対するモルモットモノクローナル抗体。
[21]
下記κ鎖CDR1、κ鎖CDR2及びκ鎖CDR3のいずれか1つずつの組合せを含むκ鎖または下記γ鎖CDR1、γ鎖CDR2及びγ鎖CDR3のいずれか1つずつの組合せを含むγ鎖を含むヒトインスリンに対するモルモットモノクローナル抗体。
本発明の第1の態様は、目的抗原に特異的に結合する形質細胞および形質芽細胞の少なくとも一方を選択する方法である。
非ヒト動物からリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を目的抗原にin vitroで感作させるか、または、非ヒト動物を目的抗原で免疫し、
免疫成立後の動物からリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、
前記感作させた、または採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞と、(1)標識した目的抗原および(2)形質細胞および/または形質芽細胞に選択的に結合する標識物質とを混合し、
前記(1)標識した目的抗原および(2)標識物質が結合した細胞を選択することを含む。
NHA法により、目的抗原に特異的に結合する非ヒト動物の形質細胞および形質芽細胞の少なくとも一方を選択することができる。
ヒトからリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を目的抗原にin vitroで感作させるか、または目的抗原に対する抗体を有するヒトからリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、
前記感作させた、または採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞と、(1)標識した目的抗原、および(2)形質細胞および/または形質芽細胞を選択的に結合する標識物質を混合し、
前記(1)標識した目的抗原および(2)標識物質が結合した細胞を選択することを含む。
HU法により、目的抗原に特異的に結合するヒトの形質細胞および形質芽細胞の少なくとも一方を選択することができる。
非ヒト動物を目的抗原で免疫する。
本発明において「非ヒト動物」とは、ヒト以外の免疫系を有する全ての動物を意味する。そのような動物の例としては、哺乳動物、鳥類などを挙げることができる。哺乳動物の例としては、類人猿、サル、イヌ、ネコ、ウマ、ウシ、ブタ、ヒツジ、ヤギ、ロバ、ラクダ、ラマ、アルパカ、トナカイ、スイギュウ、ヤク、モルモット、ウサギ、ミンク、マウス、ラット、スナネズミ、ハムスター、ゴールデンハムスター、アルメニアンハムスター、フェレット、ミニブタ、アライグマ、フクロネズミ、スンクス、カンガルー、イルカなどを挙げることができる。鳥類としては、ニワトリ、ウズラまたはダチョウなどを挙げることができる。
免疫成立後の動物からリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取する。本発明の目的は、目的抗原に特異的に結合する非ヒト動物の形質細胞および形質芽細胞の少なくとも一方を選択することであるので、形質細胞および/または形質芽細胞を含む可能性が高い、リンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取する。
採取したリンパ節から、目的抗原に特異的に結合する非ヒト動物の形質細胞および形質芽細胞の少なくとも一方を選択する。この選択を行うために、(1)標識した目的抗原、および(2)形質細胞および/または形質芽細胞に選択的に結合する標識物質を用いる。
標識した目的抗原とは、非ヒト動物の免疫に用いた目的抗原と同一のエピトープを含む物質である。従って、標識した目的抗原と免疫に用いた目的抗原とは、全く同一の物質であることもできるし、共通するエピトープを含む別の物質であることもできる。
形質細胞および/または形質芽細胞に選択的に結合する標識物質としては、例えば、以下に説明する蛍光プローブ1を挙げることができる。
蛍光プローブ1は、形質細胞並びに形質芽細胞の同定または単離に用いるための蛍光プローブであって、細胞の小胞体に対する親和性が、他の小器官に対する親和性に比べて高い、換言すると、細胞の小胞体を選択的に染色する蛍光プローブである。形質細胞並びに形質芽細胞は、形質細胞並びに形質芽細胞以外の細胞に比べて、小胞体が異常に発達しており、その結果、蛍光プローブ1での染色により得られる蛍光強度は、形質細胞並びに形質芽細胞以外の細胞が蛍光プローブ1で染色された場合の蛍光強度に比べて、形質細胞並びに形質芽細胞と形質細胞並びに形質芽細胞以外の細胞とを識別可能な程度の差を示す。蛍光プローブ1が示す、上記蛍光強度比(形質細胞並びに形質芽細胞の蛍光強度/形質細胞並びに形質芽細胞以外の細胞の蛍光強度)は、例えば、3倍以上である。
(1)標識した目的抗原および(2)標識物質が結合した細胞の選択は、目的抗原の標識および形質細胞および/または形質芽細胞に特異的に結合する標識物質の種類に応じて、適宜選択することができる。目的抗原の標識および形質細胞および/または形質芽細胞に特異的に結合する標識物質のいずれもが蛍光標識(例えば、蛍光色素)の場合には、これら標識が発する蛍光を利用して、(1)標識した目的抗原および(2)標識物質が結合した細胞を選択することができる。(1)標識した目的抗原および(2)標識物質が結合した細胞の選択方法やこの方法に用いる装置には特に制限はない。既存の細胞を個々の細胞レベルで分離する方法も装置をそのまま利用できる。
本発明の第2の態様は、目的抗原に特異的な抗体または抗体の断片の製造方法である。
選択した細胞から目的抗原に対する抗体遺伝子を採取し、その塩基配列を同定し、
同定した遺伝子の塩基配列に基づいて前記抗体または抗体の断片を調製する、
ことを含む方法である。この方法により、目的抗原に特異的な抗体または抗体の断片の製造することができる。
選択した細胞から目的抗原に対する抗体遺伝子を採取し、その塩基配列を同定する。選択した細胞は、目的抗原に対する結合性を示す細胞であり、かつ形質細胞または形質芽細胞である。本発明では、これら選択した細胞の複数からなる集団で扱って、抗体遺伝子の採取と同定を行うこともできるが、好ましくは、個々の細胞について、それぞれ抗体遺伝子を採取し、その塩基配列を同定する。これにより、同一の目的抗原に対して特異的に結合する、異なるモノクローナル抗体を得ることが可能になる。
WO2009/091048に記載の方法は、基板の一方の表面に複数の突起状囲いが、整列して設けられており、前記突起状囲いは、少なくとも1つの切欠き部を有し、かつ内部には液滴を保持できる空間を有し、かつ前記基板表面の少なくとも前記液滴を保持する面は、純水に対する接触角が90~150°の範囲である反応治具を用い、磁気ビーズに固定化した物質を、上記突起状囲いの液滴保持用空間に保持された表面張力低下試薬を含有する溶液の液滴中で、前記基板の突起状囲いを有する表面とは反対側の表面から磁石を用いて、順次移動させることにより、反応及び/または洗浄を行うことを含む、反応方法である。この反応方法において磁気ビーズに固定化した物質として、選択した細胞中のmRNAと結合性を有する、例えば、オリゴdTを用いることで、実施できる。
第1のハの字型突起の空間に保持される細胞溶解用溶液は、例えば、100mM Tris HCl (pH7.5), 500mM LiCl, 1% ドデシル硫酸リチウム 5mM dithiothreitolを含む全量3μLの溶液であることができる。
第2のハの字型突起の空間に保持されるmRNA洗浄用溶液は、10mM Tris HCl (pH7.5), 0.15M LiCl, 0.1% ドデシル硫酸リチウムを含む全量3μLの溶液であることができる。
第3のハの字型突起の空間に保持される逆転写反応用洗浄溶液は、50mM Tris HCl (pH8.3), 75mM KCl, 3mM MgCl2, 0.1% Triton X-100, 0.5mM dNTP, 5mM DTT, 2 unit RNase inhibitorを含む全量3μLの溶液であることができる。
第4のハの字型突起の空間に保持される逆転写反応溶液は、50mM Tris HCl (pH8.3), 75mM KCl, 3mM MgCl2, 0.1% Triton X-100, 0.5mM dNTP, 5mM DTT, 2 unit RNase inhibitor, 8 unit SuperScript III Reverse transcriptaseを含む全量3μLの溶液であることができる。
但し、これらは例示であって、これらの溶液に限定される意図ではない。
同定した遺伝子の塩基配列に基づいて、抗体または抗体の断片を調製する。
同定した遺伝子の塩基配列に基づく抗体または抗体の断片の調製は、WO2011/027808に記載のDNA断片の特異的作製方法を用いて作製した抗体遺伝子の断片を用いて行うことができる。
[1]
標的遺伝子の両方の側に連結用DNA領域を連結させた連結DNA断片を製造する方法であって、(1)~(4)を含む方法。尚、以下において標的遺伝子は、抗体遺伝子である。
(1)標的遺伝子配列を含む二本鎖遺伝子断片から、中央部に標的遺伝子配列を含み、両末端側にそれぞれ会合可能な領域を有し、前記会合可能な2つの領域は互いに会合しない塩基配列を有し、かつ一方または両方の領域は少なくとも一部の塩基配列が標的遺伝子配列に含まれる固有の塩基配列であり、両方の会合可能な領域の3’端に1ヌクレオチド以上の突出末端を有する3’端突出二本鎖遺伝子断片を準備し、
(2)中央部に連結用DNA領域を含み、両末端側にそれぞれ会合可能な領域を有する連結用二本鎖DNA断片を準備し、
(3-1)前記3’端突出二本鎖遺伝子断片の一方の会合可能な領域は、前記連結用二本鎖DNA断片の一方の末端の会合可能な領域と相同的な塩基配列からなるが、3’突出端が付加された末端側の配列が連結用二本鎖DNA断片の一方の会合可能な領域では連結用DNA領域と結合する側であり、
(3-2)前記3’端突出二本鎖遺伝子断片の一方の会合可能な領域からの突出末端は、DNA合成反応において鎖伸長機能を有さず、
(3-3)前記3’端突出二本鎖遺伝子断片の他方の会合可能な領域は、前記連結用二本鎖DNA断片の他方の末端の会合可能な領域と相同的な塩基配列からなるが、3’突出端が付加された末端側の配列が連結用二本鎖DNA断片の他方の会合可能な領域では連結用DNA領域と結合する側であり、
(3-4)前記3’端突出二本鎖遺伝子断片の他方の会合可能な領域からの突出末端は、DNA合成反応において鎖伸長機能を有さず、
(4)上記3’端突出二本鎖遺伝子断片及び連結用二本鎖DNA断片を用いて、熱変性、再会合及びDNA合成反応を少なくとも2回行うことで、上記連結DNA断片を得ることを含む、
連結DNA断片の製造方法。
(a)前記一方の会合可能な領域を「領域1」とし、他方の会合可能な領域を「領域2」とすると、前記連結DNA断片は、模式的に領域2-連結用DNA領域-領域1-標的遺伝子-領域2-連結用DNA領域-領域1で示される配列を少なくとも1つ有するDNA断片である。
(b)連結用DNA領域が2つの連結用DNA領域として配列Aおよび配列Bを含み、
前記3’端突出二本鎖遺伝子断片の会合可能な領域は、一方が末端側から配列P1およびT1を有し、他方が末端側から配列P2およびT2を有し、配列T1および配列T2の少なくとも一方は標的遺伝子配列に含まれる固有の塩基配列を有し、
前記連結用二本鎖DNA断片の会合可能な領域は、一方が末端側から配列VP1およびVT1を有し、他方が末端側から配列VP2およびVT2を有し、配列VP1およびVT1は、配列P1およびT1とそれぞれ相同的な塩基配列を有し、配列VP2およびVT2は、配列P2およびT2とそれぞれ相同的な塩基配列を有する。
(c)前記3’端突出二本鎖遺伝子断片は、P1-T1-標的遺伝子-T2-P2で表され、前記連結用二本鎖DNA断片は、VT2-VP2-配列B-配列A-VP1-VT1で表され、前記連結DNA断片は、VT2-VP2(T2-P2)-配列B-配列A-VP1-VT1(P1-T1)-標的遺伝子-VT2-VP2(T2-P2)-配列B-配列A-VP1-VT1(P1-T1)を少なくとも1つ有するDNA断片である、但し、VT2-VP2(T2-P2)は、T2-P2と相同的なVT2-VP2であることを意味し、VP1-VT1(P1-T1)は、T1-P1と相同的なVT1-VP1であることを意味する。
(d)配列P2の3’端にある突出末端のDNA合成反応において鎖伸長機能を有さない配列は前記配列BのVP2と隣接する配列と非相同的な配列であり、配列P1の3’端にある突出末端のDNA合成反応において鎖伸長機能を有さない配列は前記配列AのVP1と隣接すると非相同的な配列である。
(e)前記突出末端は、3’端にダイデオキシヌクレオチドを含む配列である。
[1]に記載の方法で製造した連結DNA断片を鋳型として、連結DNA断片に含まれる少なくとも1つの少なくとも一部の連結用DNA領域と標的遺伝子の配列の全てを増幅するように、連結DNA断片に含まれる異なる連結用DNA領域で機能するフォワードプライマーおよびリバースプライマーを用いてPCRを行い、少なくとも1つの少なくとも一部の連結用DNA領域と標的遺伝子の配列の全てを含むDNA断片を製造することができる。
[1]の(b)に記載の方法で製造した連結DNA断片を鋳型として、配列Aの塩基配列の一部を標的遺伝子に向かうように3’端に含むフォワードプライマー、および配列Bの塩基配列の一部を標的遺伝子に向かうように3’端に含むリバースプライマーを用いてPCRを行い、配列A、標的遺伝子の配列および配列Bが連結されたDNA断片を得ることを含むDNA断片を製造する。
(a)[1](b)(c)及び[2](a)(b)に記載の製造方法においては、標的遺伝子の配列を含む二本鎖DNA断片およびポリデオキシヌクレオチドに、デオキシヌクレオチドターミナルトランスフェラーゼを作用させて、標的遺伝子の配列を含む3’端突出二本鎖遺伝子断片を得ることをさらに含むことができる。(但し、前記標的遺伝子の配列を含む二本鎖DNA断片は、配列P1および配列P2を各末端に有し、前記配列P1の内側の一部に配列T1を有し、前記配列P2の内側の一部に配列T2を有し、かつ前記配列T1およびT2の一方又は両方は、標的遺伝子に固有の塩基配列を有する。)
(b)前記配列T1および配列T2の一方または両方が、標的遺伝子に固有の塩基配列を有するか、または前記配列P1および配列P2の一方または両方が、標的遺伝子に固有の塩基配列を有する。
(c)前記配列P1およびP2は、独立に10塩基以上である
[1]~[3]においては、前記標的遺伝子が抗体遺伝子であり、前記3’端突出二本鎖遺伝子断片が前記抗体遺伝子に由来する配列を含み、ならびに、前記連結用二本鎖DNA断片または前記配列Aを有する連結用二本鎖DNA断片における前記領域VP1および領域VT1は、抗体遺伝子に由来するまたは由来しない配列を有することができる。
[1]~[3]においては、前記標的遺伝子が抗体遺伝子であり、前記3’端突出二本鎖遺伝子断片が前記抗体遺伝子に由来する配列を含み、ならびに、前記連結用二本鎖DNA断片または前記配列Bを有する連結用二本鎖DNA断片における前記領域VP2および領域VT2は、抗体遺伝子に由来するまたは由来しない配列であることができる。
[4]または[5]に記載の方法で製造された連結DNA断片を用いて抗体を製造することができる。ここで得られた連結DNA断片を用いて、抗体を製造する方法は、例えば、カチオニックリポソーム法などの方法を用いて実施できる。具体的には、上記連結DNA断片を293T細胞株などの細胞に導入し、次いで、細胞を培養することで抗体遺伝子を発現させて抗体を製造することができる。
本発明は、上記本発明の方法を用いて新たに得られた、ヒトインスリンに対するモルモット抗体の可変領域および定常領域の遺伝子およびペプチド、さらにはヒトインスリンに対するルモットモノクローナル抗体を包含する。
(1)配列表の配列番号1で示される塩基配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域の遺伝子、配列番号4で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域のペプチドをコードする遺伝子、及び配列番号4で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域のペプチド。
(2)配列表の配列番号2で示される塩基配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域の遺伝子、配列番号5で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域のペプチドをコードする遺伝子、及び配列番号5で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域のペプチド。
(3)配列表の配列番号3で示される塩基配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域の遺伝子、配列番号6で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域のペプチドをコードする遺伝子及び配列番号6で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域のペプチド。
(5)配列表の配列番号31~42で示される塩基配列を有するヒトインスリンに対するモルモット抗体のκ鎖可変領域の遺伝子、配列番号43~54で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖可変領域のペプチドをコードする遺伝子及び配列番号43~54で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖可変領域のペプチド。
(7)可変領域として配列番号43~54のいずれかで示されるアミノ酸配列を有し、かつ定常領域として配列番号5で示されるアミノ酸配列を有するκ鎖を有する、ヒトインスリンに対するモルモットモノクローナル抗体。
[材料と方法]
免疫動物はウイスター系ラット♀6週齢を用いた。抗原はGFP。免疫は、ラット尾根部の両側にGFP 50μgを一ヶ月おきに3回筋肉注射した。免疫成立後、ラットより腸骨リンパ節を採取した。GFPはAlexafluor488にて蛍光標識し、ゲルろ過により精製した。
腸骨リンパ節由来リンパ球をPBS-0.5%牛血清アルブミン溶液に懸濁させた後、GFP (0.5μg/ml)を加え4℃にて30分間撹拌させ、細胞の抗原標識を行った。細胞を遠心分離後DMEM培地に懸濁させ、これにER-Tracker (1μM)を加え5分間室温で放置することで小胞体を染色した。細胞をPBSで洗浄後、抗原特異的形質細胞画分をGFP陽性でER-tracker強陽性細胞として、また抗原非特異的形質細胞画分をGFP陰性でER-tracker強陽性細胞として、セルソーターにて分離した。
腸骨リンパ節より調製したリンパ球を、抗ラットIgG(緑)およびER-trackerによって染色後、蛍光顕微鏡にて観察した。その結果ER-tracker強陽性の形質細胞表面に弱いながらIgGの発現が認められた(図1)。
cDNA合成および免疫グロブリン遺伝子増幅は、「反応治具及び反応方法、並びにcDNAの合成方法」(WO2009/091048)に記載の方法に準じて行った(図3)。
セルソーターにより分離された個々のラットプラズマ細胞をオリゴdT25が結合した磁気ビーズ(ダイナピーズ)3μgの入った細胞溶解液3μL(100mM TrisHCl(pH7.5),500mM LiCl,1%ドデシル硫酸 Li(LiDS),5mM dithiothreitol)に加え、細胞内のmRNAを磁気ビーズに結合させた。 次に磁気ビーズを、3μLのmRNA洗浄用溶A(10mM TrisHCl(pH7.5),0.15M LiCl,0.1% LiDS)、続いて3μLのmRNA洗浄用溶液B(75mM KCl,3mM MgCl2,0.1%TritonX,0.5mM dNTP,5mM DTT,2unit RNase inhibitor)にて1回洗浄した後、cDNA合成を行った。洗浄後の磁気ビーズに、cDNA合成用溶液3μL(50mM Tris HCl(pH8.3),75mM KCl,3mM MgCl2,0.1%TritonX-100,0.5mM dNTP,5mM DTT,2 unit RNase inhibitor,l0unit SuperScriptlll Reversetranscriptase(Invitrogen)を加え、37℃にて1時間反応させた。次に磁気ビーズを3’テーリング洗浄溶液3μL(50mMリン酸カリウム(pH7.0),0.5mM dGTP,0.1%TritonX-100,4mM塩化マグネシウム)にて洗浄し、新たに3’テーリング反応溶液3μL(50mMリン酸カリウム(pH7.0),0.5mM dGTP,0.1%TritonX-100,4mM塩化マグネシウム,terminaldeoxynucleotidyltransferase 10U)を加え、37℃にて30分間反応を行った。
磁気ビーズを3μLのTE溶液(10mM TrisHCl(pH7.5),1mM EDTA,0.1%TritonX-100)にて洗浄後、5’-RACE PCR法を用いてヒト免疫グロブリンγ鎖及びκ鎖遺伝子の増幅を行った。1回目のPCR反応は、磁気ビーズに25μLのPCR反応溶液(プライマーを各0.2μM、dNTP 0.2 mM、タカラバイオPrimeSTAR耐熱性DNAポリメラーゼ lU含有)を加え94℃30秒-68℃40秒の反応を35サイクル行った。用いたプライマーは(ア)であり、TdTによりcDNAの3’端に付加されたポリGにアニーリングする。プライマー配列は(イ)であり、ラット免疫グロブリンγ鎖遺伝子の定常領域に由来する。プライマー配列は(ウ)であり、ラット免疫グロブリンκ鎖遺伝子の定常領域に由来する。
用いたプライマーは、
1回目PCRセンスプライマー
5-GCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCCDN-3 (ア)(配列番号55)
1回目PCRγ鎖増幅用アンチセンスプライマー
5- GCAGGTGACGGTCTGGCTGGRCCAGGTGCTGGA-3 (イ)(配列番号56)
1回目PCRκ鎖増幅用アンチセンスプライマー
5- TCGTTCAGTGCCATCAATCTTCCACTTGAC-3 (ウ)(配列番号57)
2回目PCR増幅用センスプライマー
5-CGCTAGCGCTACCGGACTCAGATCCC-3 (エ)(配列番号58)
2回目PCRγ鎖増幅用アンチセンスプライマー
5- CTGCAGGACAGCTGGGAAGGTGTGCAC-3 (オ)(配列番号59)
2回目PCRκ鎖増幅用アンチセンスプライマー
5- TAACTGTTCCGTGGATGGTGGGAAGAT-3 (カ)(配列番号60)
反応後、PCR溶液各1μLを取り、アガロースゲル電気泳動法にてκ及びγ鎖免疫グロブリン遺伝子断片の発現ユニットへの変換を確認した(図3上を参照)
ラットγ鎖遺伝子、κ鎖遺伝子発現ユニット作製は、「標的遺伝子由来配列を含む連結DNA断片の特異的作製方法」(WO2011/027808)の方法に準じて調製した。
即ち5'-RACE-PCR法により増幅された各PCR産物1μLに、terminaldeoxynucleotidyltransferaseを2 unit加え、37℃にて30分反応させ、その後94℃にて5分間加熱することで酵素反応を停止させた。
同様に、ラットκ鎖遺伝子溶液に、ラットκ鎖遺伝子連結用二本鎖DNA断片を加え反応を行い、ラットκ鎖遺伝子発現ユニットを作製した。
5-AGAGAAACCGTCTATCAGGGCGATGGC-3 (キ)(配列番号61)
5-AGAGACCCTTTGACGTTGGAGTCCACG-3 (ク)(配列番号62)
反応後、PCR溶液各1μLを取り、アガロースゲル電気泳動法にてκ及びγ鎖免疫グロブリン遺伝子断片の発現ユニットへの変換を確認した(図3下を参照)
遺伝子連結用二本鎖DNA断片
TGGAACTCTGGAGCCCTGTCCAGCGGTGTGCACACCTTCCCAGCTGTCCTGCAGTCTGGGCTCTACACTCTCACCAGCTCAGTGACTGTACCCTCCAGCACCTGGCCCAGCCAGACCGTCACCTGCAACGTAGCCCACCCGGCCAGCAGCACCAAGGTGGACAAGAAAATTGTGCCCAGAAACTGTGGAGGTGATTGCAAGCCTTGTATATGTACAGGCTCAGAAGTATCATCTGTCTTCATCTTCCCCCCAAAGCCCAAAGATGTGCTCACCATCACTCTGACTCCTAAGGTCACGTGTGTTGTGGTAGACATTAGCCAGGACGATCCCGAGGTCCATTTCAGCTGGTTTGTAGATGACGTGGAAGTCCACACAGCTCAGACTCGACCACCAGAGGAGCAGTTCAACAGCACTTTCCGCTCAGTCAGTGAACTCCCCATCCTGCACCAGGACTGGCTCAATGGCAGGACGTTCAGATGCAAGGTCACCAGTGCAGCTTTCCCATCCCCCATCGAGAAAACCATCTCCAAACCCGAAGGCAGAACACAAGTTCCGCATGTATACACCATGTCACCTACCAAGGAAGAGATGACCCAGAATGAAGTCAGTATCACCTGCATGGTAAAAGGCTTCTATCCCCCAGACATTTATGTGGAGTGGCAGATGAACGGGCAGCCACAGGAAAACTACAAGAACACTCCACCTACGATGGACACAGATGGGAGTTACTTCCTCTACAGCAAGCTCAATGTGAAGAAGGAAAAATGGCAGCAGGGAAACACGTTCACGTGTTCTGTGCTGCATGAAGGCCTGCACAACCACCATACTGAGAAGAGTCTCTCCCACTCTCCGGGTAAATGACCCGCGGCCGCGACTCTAGATCATAATCAGCCATACCACATTTGTAGAGGTTTTACTTGCTTTAAAAAACCTCCCACACCTCCCCCTGAACCTGAAACATAAAATGAATGCAATTGTTGTTGTTAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTAAGGCGTAAATTGTAAGCGTTAATATTTTGTTAAAATTCGCGTTAAATTTTTGTTAAATCAGCTCATTTTTTAACCAATAGGCCGAAATCGGCAAAATCCCTTATAAATCAAAAGAATAGACCGAGATAGGGTTGAGTGTTGTTCCAGTTTGGAACAAGAGTCCACTATTAAAGAACGTGGACTCCAACGTCAAAGGGCGAAAAACCGTCTATCAGGGCGATGGCCCACTACGTGAACCATCACCCTAATCAAGTTTTTTGGGGTCGAGGTGCCGTAAAGCACTAAATCGGAACCCTAAAGGGAGCCCCCGATTTAGAGCTTGACGGGGAAAGCCGGCGAACGTGGCGAGAAAGGAAGGGAAGAAAGCGAAAGGAGCGGGCGCTAGGGCGCTGGCAAGTGTAGCGGTCACGCTGCGCGTAACCACCACACCCGCCGCGCTTAATGCGCCGCTACAGGGCGCGTCagatctTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTGGTTTAGTGAACCGTCAGATCCGCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCC
ラットκ鎖遺伝子連結用二本鎖DNA断片はラットκ鎖定常領域(1-325)、連結配列II(1-53)、ポリA付加シグナル(507-513)、CMVプロモーター(1038-1633)、連結配列1(1634-1662)からなる(配列番号64)。
GGGCTGATGCTGCACCAACTGTATCTATCTTCCCACCATCCACGGAACAGTTAGCAACTGGAGGTGCCTCAGTCGTGTGCCTCATGAACAACTTCTATCCCAGAGACATCAGTGTCAAGTGGAAGATTGATGGCACTGAACGACGAGATGGTGTCCTGGACAGTGTTACTGATCAGGACAGCAAAGACAGCACGTACAGCATGAGCAGCACCCTCTCGTTGACCAAGGCTGACTATGAAAGTCATAACCTCTATACCTGTGAGGTTGTTCATAAGACATCATCCTCACCCGTCGTCAAGAGCTTCAACAGGAATGAGTGTTAGACGCGGCCGCGACTCTAGATCATAATCAGCCATACCACATTTGTAGAGGTTTTACTTGCTTTAAAAAACCTCCCACACCTCCCCCTGAACCTGAAACATAAAATGAATGCAATTGTTGTTGTTAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTAAGGCGTAAATTGTAAGCGTTAATATTTTGTTAAAATTCGCGTTAAATTTTTGTTAAATCAGCTCATTTTTTAACCAATAGGCCGAAATCGGCAAAATCCCTTATAAATCAAAAGAATAGACCGAGATAGGGTTGAGTGTTGTTCCAGTTTGGAACAAGAGTCCACTATTAAAGAACGTGGACTCCAACGTCAAAGGGCGAAAAACCGTCTATCAGGGCGATGGCCCACTACGTGAACCATCACCCTAATCAAGTTTTTTGGGGTCGAGGTGCCGTAAAGCACTAAATCGGAACCCTAAAGGGAGCCCCCGATTTAGAGCTTGACGGGGAAAGCCGGCGAACGTGGCGAGAAAGGAAGGGAAGAAAGCGAAAGGAGCGGGCGCTAGGGCGCTGGCAAGTGTAGCGGTCACGCTGCGCGTAACCACCACACCCGCCGCGCTTAATGCGCCGCTACAGGGCGCGTCagatctTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTGGTTTAGTGAACCGTCAGATCCGCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCC
インスリンは、肝臓、筋肉や脂肪組織の細胞表面に存在するインスリン受容体と結合し、ブドウ糖の細胞内への取り込みを制御することで体内のエネルギー代謝を調節する役割を担う重要なホルモンである。血中インスリン濃度の測定は糖尿病、肥満等の病態を把握する上でも極めて重要な意味を持っている。哺乳動物のインスリンの構造は、モルモットを除いては高いホモロジーを有しているため、マウスを用いたモノクローナル抗体の作製は困難である。このため、ヒトインスリンの血中濃度測定にはモルモット血清から得られたポリクローナル抗体が用いられてきた。しかしポリクローナル抗体は免疫動物個体間のロット差が大きく、一定の品質を維持することが困難であり、抗ヒトインスリンモルモットモノクローナル抗体の開発が望まれていた。そこで本発明を用い、抗ヒトインスリンモルモットモノクローナル抗体の作製を行った。
免疫動物はモルモット♀6週齢を用いた。抗原はヒトインスリン。免疫は、モルモット尾部の両側にヒトインスリン50μgを一ヶ月おきに4回筋肉注射した。免疫成立後、モルモットより腸骨リンパ節を採取した。インスリンはAlexafluor594にて蛍光標識し、ゲルろ過により精製した。
腸骨リンパ節よりリンパ球をPBS-0.5%牛血清アルブミン溶液に懸濁させた後、蛍光色素標識抗モルモット抗体を加え4℃にて30分間撹拌させた。細胞を遠心分離後DMAM培地に懸濁させ、これにER-Tracker (1μM)を加え5分間室温で放置することで小胞体を染色し蛍光顕微鏡にて観察した。その結果ER-tracker強陽性の形質細胞表面にIgGの発現が認められた(図5)。
cDNA合成および免疫グロブリン遺伝子増幅は、「反応治具及び反応方法、並びにcDNAの合成方法」(WO2009/091048)に記載の方法に準じて行った。
セルソーターにより分離された個々のモルモットプラズマ細胞をオリゴdT25が結合した磁気ビーズ(ダイナピーズ)3μgの入った細胞溶解液3μL(100mM TrisHCl(pH7.5),500mM LiCl,1%ドデシル硫酸 Li(LiDS),5mM dithiothreitol)に加え、細胞内のmRNAを磁気ビーズに結合させた。 次に磁気ビーズを、3μLのmRNA洗浄用溶A(10mM TrisHCl(pH7.5),0.15M LiCl,0.1% LiDS)、続いて3μLのmRNA洗浄用溶液B(75mM KCl,3mM MgCl2,0.1%TritonX,0.5mM dNTP,5mM DTT,2unit RNase inhibitor)にて1回洗浄した後、cDNA合成を行った。洗浄後の磁気ビーズに、cDNA合成用溶液3μL(50mM Tris HCl(pH8.3),75mM KCl,3mM MgCl2,0.1%TritonX-100,0.5mM dNTP,5mM DTT,2 unit RNase inhibitor,l0unit SuperScriptlll Reversetranscriptase(Invitrogen)を加え、37℃にて1時間反応させた。次に磁気ビーズを3’テーリング洗浄溶液3μL(50mMリン酸カリウム(pH7.0),0.5mM dGTP,0.1%TritonX-100,4mM塩化マグネシウム)にて洗浄し、新たに3’テーリング反応溶液3μL(50mMリン酸カリウム(pH7.0),0.5mM dGTP,0.1%TritonX-100, 4mM塩化マグネシウム,terminaldeoxynucleotidyltransferase 10U)を加え、37℃にて30分間反応を行った。
磁気ビーズを3μLのTE溶液(10mM TrisHCl(pH7.5),1mM EDTA,0.1%TritonX-100)にて洗浄後、5’-RACE PCR法を用いてヒト免疫グロブリンγ鎖及びκ鎖遺伝子の増幅を行った。1回目のPCR反応は、磁気ビーズに25μLのPCR反応溶液(プライマーを各0.2μM、dNTP 0.2 mM、タカラバイオPrimeSTAR耐熱性DNAポリメラーゼ lU含有)を加え94℃30秒-68℃40秒の反応を35サイクル行った。用いたプライマーは(ア)であり、TdTによりcDNAの3’端に付加されたポリGにアニーリングする。プライマー配列は(ケ)であり、モルモット免疫グロブリンγ鎖遺伝子の定常領域に由来する。プライマー配列は(コ)であり、モルモット免疫グロブリンκ鎖遺伝子の定常領域に由来する。プライマー配列は(サ)であり、モルモット免疫グロブリンλ鎖遺伝子の定常領域に由来する。
用いたプライマーは、
1回目PCRγ鎖増幅用アンチセンスプライマー
5-GGTGCTGCTGGCCGGGTGGGCTACATTGCA-3 (ケ)(配列番号65)
1回目PCRκ鎖増幅用アンチセンスプライマー
5-CAGAGCCATCCACCTTCCACTTGACGG-3(コ)(配列番号66)
1回目PCRλ鎖増幅用アンチセンスプライマー
5-CTGCTGGCCATGTATTTGTTGTCGCTCTG-3(サ)(配列番号67)
2回目PCR増幅用センスプライマー
5-CTGAAGGACGGCCGGGAAGGTGTGCAC-3(シ)(配列番号68)
2回目PCRκ鎖増幅用アンチセンスプライマー
5-GGAAGAGGGAGATAGTTGGCTTCTGCACACTC-3(ス)(配列番号69)
2回目PCRλ鎖増幅用アンチセンスプライマー
5-AGAAGGAATTCAGGAGACACACCACTGT-3(セ)(配列番号70)
上記で調製されたcDNAを鋳型として用い、プライマー(ソ)と(タ)でγ鎖定常領域を、プライマー(チ)と(ツ)でκ鎖定常領域を、プライマー(テ)と(ト)でλ鎖定常領域を増幅した。増幅されたDNA断片をpBlucscript SKベクターのXhoI/NotIサイトに挿入した後、塩基配列を決定した。
(ソ)5-AGAGACTCGAGTGCCTGGTCAAGGGCTACTTCCCTGA-3(配列番号71)
(タ)5-GAGAGAGCGGCCGCTCATTTACCCGGAGACCGGGAGAT-3(配列番号72)
(チ)5-AGAGACTCGAGGGGACCAAGCTGGAAATCAAACGGA-3(配列番号73)
(ツ)5-GAGAGAGCGGCCGCCTAGCACTCGCTCCTGTTGATGGTCT-3(配列番号74)
(テ)5-AGAGACTCGAGGAGGAGCTCCAGGACAACAAGGC-3(配列番号75)
(ト)5-GAGAGAGCGGCCGCTAAGAACACTCTGACGGGGCCAC-3(配列番号76)
TGCCTGGTCAAGGGCTACTTCCCTGAGCCGGTGACTGTGAAATGGAACTCAGGGGCCCTGACCAGTGGAGTGCACACCTTCCCGGCCGTCCTTCAGTCAGGCCTGTACTCACTCACCAGCATGGTAACTGTGCCCTCCAGCCAGAAGAAGGCCACCTGCAATGTAGCCCACCCGGCCAGCAGCACCAAGGTGGACAAGACTGTTGAGCCTATTCGAACTCCTCAACCCAACCCGTGTACATGTCCCAAGTGCCCACCTCCTGAAAACCTGGGTGGACCATCTGTCTTCATCTTTCCCCCGAAGCCCAAGGACACGCTCATGATCTCCCTGACCCCTAGGGTCACATGTGTGGTGGTAGATGTGAGCCAAGATGAGCCTGAAGTCCAGTTCACATGGTTCGTGGACAACAAACCGGTCGGCAATGCTGAGACAAAGCCCCGAGTGGAGCAATACAACACGACATTCCGCGTGGAAAGTGTCCTCCCCATCCAGCACCAGGACTGGCTGAGGGGCAAGGAATTCAAGTGCAAGGTCTACAACAAAGCCCTGCCAGCCCCCATAGAGAAGACCATCTCCAAAACCAAAGGGGCTCCCCGCATGCCAGATGTGTACACCCTTCCCCCGTCCCGAGACGAGCTATCCAAGAGCAAAGTCAGTGTGACCTGCCTGATCATCAACTTCTTTCCTGCCGACATCCACGTGGAGTGGGCCAGCAATAGGGTTCCAGTGAGTGAGAAGGAATACAAGAACACCCCACCCATTGAGGACGCTGACGGGTCCTACTTCCTCTACAGCAAGCTCACTGTGGATAAGAGCGCGTGGGATCAGGGAACCGTCTACACCTGCTCCGTGATGCATGAAGCCCTGCACAATCATGTCACTCAGAAGGCCATCTCCCGGTCTCCGGGTAA
CLVKGYFPEPVTVKWNSGALTSGVHTFPAVLQSGLYSLTSMVTVPSSQKKATCNVAHPASSTKVDKTVEPIRTPQPNPCTCPKCPPPENLGGPSVFIFPPKPKDTLMISLTPRVTCVVVDVSQDEPEVQFTWFVDNKPVGNAETKPRVEQYNTTFRVESVLPIQHQDWLRGKEFKCKVYNKALPAPIEKTISKTKGAPRMPDVYTLPPSRDELSKSKVSVTCLIINFFPADIHVEWASNRVPVSEKEYKNTPPIEDADGSYFLYSKLTVDKSAWDQGTVYTCSVMHEALHNHVTQKAISRSPG
GGGACCAAGCTGGAAATCAAACGGAGTGTGCAGAAGCCAACTATCTCCCTCTTCCCTCCATCATCTGAGGAGGTGACAGCTGGAAGTGCCTCAGTTGTGTGCTTCATTAATAGCTTCTATCCAAGAGACATCACCGTCAAGTGGAAGGTGGATGGCTCTGAACGCTCACAAGGCATCCTGAACAGTTACACAGATCAGGACAGCAAGGACAACACCTACAGCCTCAGTAGCACCCTGGCGCTGACGGCTTCAGAGTACAATCAGCATGAGAGGTACACCTGCGAGGTCTCCCACGCTGGCCTGACCTCACCCGCTGCCAAGACCATCAACAGGAGCGAGTGCTAG
GTKLEIKRSVQKPTISLFPPSSEEVTAGSASVVCFINSFYPRDITVKWKVDGSERSQGILNSYTDQDSKDNTYSLSSTLALTASEYNQHERYTCEVSHAGLTSPAAKTINRSEC
GAGGAGCTCCAGGACAACAAGGCCACAGTGGTGTGTCTCCTGAATTCCTTCTACCCCGGCTCTGTGAATGTCAGCTGGAAGGCAGATGGCACCACCATCAACCAGGGCGTGCAGACCACACAGCCTGCCAAACAGAGCGACAACAAATACATGGCCAGCAGCTACCTGACACTGACTCCCGACCAGTGGAGGTCTCACCAGAGAATCAGCTGCCAGGTCAAACACGAGGCAGGCAATGTGGAGAAGAGTTTGGCCCCGTCAGAGTGTTCTTAA
EELQDNKATVVCLLNSFYPGSVNVSWKADGTTINQGVQTTQPAKQSDNKYMASSYLTLTPDQWRSHQRISCQVKHEAGNVEKSLAPSECS
即ち、5'-RACE-PCR法により増幅された各PCR産物1μLに、terminaldeoxynucleotidyltransferaseを2 unit加え、37℃にて30分反応させ、その後94℃にて5分間加熱することで酵素反応を停止させた。
反応後、PCR溶液各1μLを取り、アガロースゲル電気泳動法にてκ及びγ鎖免疫グロブリン遺伝子断片の発現ユニットへの変換を確認した(図8を参照)。
TGCCTGGTCAAGGGCTACTTCCCTGAGCCGGTGACTGTGAAATGGAACTCAGGGGCCCTGACCAGTGGAGTGCACACCTTCCCGGCCGTCCTTCAGTCAGGCCTGTACTCACTCACCAGCATGGTAACTGTGCCCTCCAGCCAGAAGAAGGCCACCTGCAATGTAGCCCACCCGGCCAGCAGCACCAAGGTGGACAAGACTGTTGAGCCTATTCGAACTCCTCAACCCAACCCGTGTACATGTCCCAAGTGCCCACCTCCTGAAAACCTGGGTGGACCATCTGTCTTCATCTTTCCCCCGAAGCCCAAGGACACGCTCATGATCTCCCTGACCCCTAGGGTCACATGTGTGGTGGTAGATGTGAGCCAAGATGAGCCTGAAGTCCAGTTCACATGGTTCGTGGACAACAAACCGGTCGGCAATGCTGAGACAAAGCCCCGAGTGGAGCAATACAACACGACATTCCGCGTGGAAAGTGTCCTCCCCATCCAGCACCAGGACTGGCTGAGGGGCAAGGAATTCAAGTGCAAGGTCTACAACAAAGCCCTGCCAGCCCCCATAGAGAAGACCATCTCCAAAACCAAAGGGGCTCCCCGCATGCCAGATGTGTACACCCTTCCCCCGTCCCGAGACGAGCTATCCAAGAGCAAAGTCAGTGTGACCTGCCTGATCATCAACTTCTTTCCTGCCGACATCCACGTGGAGTGGGCCAGCAATAGGGTTCCAGTGAGTGAGAAGGAATACAAGAACACCCCACCCATTGAGGACGCTGACGGGTCCTACTTCCTCTACAGCAAGCTCACTGTGGATAAGAGCGCGTGGGATCAGGGAACCGTCTACACCTGCTCCGTGATGCATGAAGCCCTGCACAATCATGTCACTCAGAAGGCCATCTCCCGGTCTCCGGGTAAATGAGCGGCCGCGACTCTAGATCATAATCAGCCATACCACATTTGTAGAGGTTTTACTTGCTTTAAAAAACCTCCCACACCTCCCCCTGAACCTGAAACATAAAATGAATGCAATTGTTGTTGTTAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTAAGGCGTAAATTGTAAGCGTTAATATTTTGTTAAAATTCGCGTTAAATTTTTGTTAAATCAGCTCATTTTTTAACCAATAGGCCGAAATCGGCAAAATCCCTTATAAATCAAAAGAATAGACCGAGATAGGGTTGAGTGTTGTTCCAGTTTGGAACAAGAGTCCACTATTAAAGAACGTGGACTCCAACGTCAAAGGGCGAAAAACCGTCTATCAGGGCGATGGCCCACTACGTGAACCATCACCCTAATCAAGTTTTTTGGGGTCGAGGTGCCGTAAAGCACTAAATCGGAACCCTAAAGGGAGCCCCCGATTTAGAGCTTGACGGGGAAAGCCGGCGAATAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTGGTTTAGTGAACCGTCAGATCCGCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCC
連結配列II(1-55)、ポリA付加シグナル(346-548)、CMVプロモーター(1058-1652)、連結配列1(1653-1682)からなる(配列番号78)。
GGGACCAAGCTGGAAATCAAACGGAGTGTGCAGAAGCCAACTATCTCCCTCTTCCCTCCATCATCTGAGGAGGTGACAGCTGGAAGTGCCTCAGTTGTGTGCTTCATTAATAGCTTCTATCCAAGAGACATCACCGTCAAGTGGAAGGTGGATGGCTCTGAACGCTCACAAGGCATCCTGAACAGTTACACAGATCAGGACAGCAAGGACAACACCTACAGCCTCAGTAGCACCCTGGCGCTGACGGCTTCAGAGTACAATCAGCATGAGAGGTACACCTGCGAGGTCTCCCACGCTGGCCTGACCTCACCCGCTGCCAAGACCATCAACAGGAGCGAGTGCTAGGCGGCCGCGACTCTAGATCATAATCAGCCATACCACATTTGTAGAGGTTTTACTTGCTTTAAAAAACCTCCCACACCTCCCCCTGAACCTGAAACATAAAATGAATGCAATTGTTGTTGTTAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTAAGGCGTAAATTGTAAGCGTTAATATTTTGTTAAAATTCGCGTTAAATTTTTGTTAAATCAGCTCATTTTTTAACCAATAGGCCGAAATCGGCAAAATCCCTTATAAATCAAAAGAATAGACCGAGATAGGGTTGAGTGTTGTTCCAGTTTGGAACAAGAGTCCACTATTAAAGAACGTGGACTCCAACGTCAAAGGGCGAAAAACCGTCTATCAGGGCGATGGCCCACTACGTGAACCATCACCCTAATCAAGTTTTTTGGGGTCGAGGTGCCGTAAAGCACTAAATCGGAACCCTAAAGGGAGCCCCCGATTTAGAGCTTGACGGGGAAAGCCGGCGAACGTGGCGAGAAAGGAAGGGAAGAAAGCGAAAGGAGCGGGCGCTAGGGCGCTGGCAAGTGTAGCGGTCACGCTGCGCGTAACCACCACACCCGCCGCGCTTAATGCGCCGCTACAGGGCGCGTCagatctTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTGGTTTAGTGAACCGTCAGATCCGCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCC
GAGGAGCTCCAGGACAACAAGGCCACAGTGGTGTGTCTCCTGAATTCCTTCTACCCCGGCTCTGTGAATGTCAGCTGGAAGGCAGATGGCACCACCATCAACCAGGGCGTGCAGACCACACAGCCTGCCAAACAGAGCGACAACAAATACATGGCCAGCAGCTACCTGACACTGACTCCCGACCAGTGGAGGTCTCACCAGAGAATCAGCTGCCAGGTCAAACACGAGGCAGGCAATGTGGAGAAGAGTTTGGCCCCGTCAGAGTGTTCTTAGCGGCCGCGACTCTAGATCATAATCAGCCATACCACATTTGTAGAGGTTTTACTTGCTTTAAAAAACCTCCCACACCTCCCCCTGAACCTGAAACATAAAATGAATGCAATTGTTGTTGTTAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTAAGGCGTAAATTGTAAGCGTTAATATTTTGTTAAAATTCGCGTTAAATTTTTGTTAAATCAGCTCATTTTTTAACCAATAGGCCGAAATCGGCAAAATCCCTTATAAATCAAAAGAATAGACCGAGATAGGGTTGAGTGTTGTTCCAGTTTGGAACAAGAGTCCACTATTAAAGAACGTGGACTCCAACGTCAAAGGGCGAAAAACCGTCTATCAGGGCGATGGCCCACTACGTGAACCATCACCCTAATCAAGTTTTTTGGGGTCGAGGTGCCGTAAAGCACTAAATCGGAACCCTAAAGGGAGCCCCCGATTTAGAGCTTGACGGGGAAAGCCGGCGAACGTGGCGAGAAAGGAAGGGAAGAAAGCGAAAGGAGCGGGCGCTAGGGCGCTGGCAAGTGTAGCGGTCACGCTGCGCGTAACCACCACACCCGCCGCGCTTAATGCGCCGCTACAGGGCGCGTCagatctTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTGGTTTAGTGAACCGTCAGATCCGCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCC
ウサギは他の動物では得られない高親和性の抗体を作製することが知られている。そこで本発明を用い、ウサギモノクローナル抗体の作製を行った。
免疫動物はウサギ♀6週齢を用いた。抗原は卵白アルブミン。免疫は、ウサギ尾部の両側に卵白アルブミン300μgを一ヶ月おきに4回筋肉注射した。免疫成立後、腸骨リンパ節を採取した。卵白アルブミンはAlexafluor488にて蛍光標識し、ゲルろ過により精製した。
腸骨リンパ節よりリンパ球をPBS-0.5%牛血清アルブミン溶液に懸濁させた後、Alexafluor488蛍光標識卵白アルブミンを加え4℃にて30分間撹拌させた。細胞を遠心分離後PBSに再懸濁させ、これにER-Tracker (1μM)を加え5分間室温で放置することで小胞体を染色しフローサイトメーターにて解析した。その結果、卵白アルブミン陽性でER-tracker強陽の細胞群が存在した(図10)。これを抗原特異的形質細胞画分とした。
cDNA合成および免疫グロブリン遺伝子増幅は、「反応治具及び反応方法、並びにcDNAの合成方法」(WO2009/091048)に記載の方法に準じて行った。セルソーターにより分離された個々のウサギプラズマ細胞をオリゴdT25が結合した磁気ビーズ(ダイナピーズ)3μgの入った細胞溶解液3μL(100mM TrisHCl(pH7.5),500mM LiCl,1%ドデシル硫酸 Li(LiDS),5mM dithiothreitol)に加え、細胞内のmRNAを磁気ビーズに結合させた。 次に磁気ビーズを、3μLのmRNA洗浄用溶A(10mM TrisHCl(pH7.5),0.15M LiCl,0.1% LiDS)、続いて3μLのmRNA洗浄用溶液B(75mM KCl,3mM MgCl2,0.1%TritonX,0.5mM dNTP,5mM DTT,2unit RNase inhibitor)にて1回洗浄した後、cDNA合成を行った。洗浄後の磁気ビーズに、cDNA合成用溶液3μL(50mM Tris HCl(pH8.3),75mM KCl,3mM MgCl2,0.1%TritonX-100,0.5mM dNTP,5mM DTT,2 unit RNase inhibitor,l0unit SuperScriptlll Reversetranscriptase(Invitrogen)を加え、37℃にて1時間反応させた。次に磁気ビーズを3'テーリング洗浄溶液3μL(50mMリン酸カリウム(pH7.0),0.5mM dGTP,0.1%TritonX-100,4mM塩化マグネシウム)にて洗浄し、新たに3'テーリング反応溶液3μL(50mMリン酸カリウム(pH7.0),0.5mM dGTP,0.1%TritonX-100, 4mM塩化マグネシウム,terminaldeoxynucleotidyltransferase 10U)を加え、37℃にて30分間反応を行った。
磁気ビーズを3μLのTE溶液(10mM TrisHCl(pH7.5),1mM EDTA,0.1%TritonX-100)にて洗浄後、5'-RACE PCR法を用いてヒト免疫グロブリンγ鎖及びκ鎖遺伝子の増幅を行った。1回目のPCR反応は、磁気ビーズに25μLのPCR反応溶液(プライマーを各0.2μM、dNTP 0.2 mM、タカラバイオPrimeSTAR耐熱性DNAポリメラーゼ lU含有)を加え94℃30秒-68℃40秒の反応を35サイクル行った。用いたプライマーは(ア)であり、TdTによりcDNAの3'端に付加されたポリGにアニーリングする。プライマー配列は(ナ))であり、ウサギ免疫グロブリンγ鎖遺伝子の定常領域に由来する。プライマー
配列は(ニ)であり、ウサギ免疫グロブリンκ鎖遺伝子の定常領域に由来する。
用いたプライマーは、
1回目PCRγ鎖増幅用アンチセンスプライマー
5-GCTGGCTGCTTGAGGTCACGCTCACCAC-3 (ナ)(配列番号80)
1回目PCRκ鎖増幅用アンチセンスプライマー
5- CAGTTGTTTGGGTGGTGCCATCCAC-3 (ニ)(配列番号81)
2回目PCRγ鎖増幅用アンチセンスプライマー
5- CTGCCGGACGGACGGGAAGGTGCGTAC-3 (ヌ)(配列番号82)
2回目PCRκ鎖増幅用アンチセンスプライマー
5- ACACACGATGGTGACTGTTCCAGTTG-3 (ネ)(配列番号83)
ウサギγ鎖遺伝子、κ鎖遺伝子発現ユニット作製は、「標的遺伝子由来配列を含む連結DNA断片の特異的作製方法」(WO2011/027808)の方法に準じて調製した。即ち5'-RACE-PCR法により増幅された各PCR産物1μLに、terminaldeoxynucleotidyltransferaseを2 unit加え、37℃にて30分反応させ、その後94℃にて5分間加熱することで酵素反応を停止させた。
同様に、ウサギκ鎖遺伝子溶液に、ウサギκ鎖遺伝子連結用二本鎖DNA断片を加え反応を行い、ウサギκ鎖遺伝子発現ユニットを作製した。
反応後、PCR溶液各1μLを取り、アガロースゲル電気泳動法にてκ及びγ鎖免疫グロブリン遺伝子断片の発現ユニットへの変換を確認した(図12)。
遺伝子連結用二本鎖DNA断片
CTGGTCAAAGGCTACCTCCCGGAGCCAGTGACCGTGACCTGGAACTCGGGCACCCTCACCAATGGGGTACGCACCTTCCCGTCCGTCCGGCAGTCCTCAGGCCTCTACTCGCTGAGCAGCGTGGTGAGCGTGACCTCAAGCAGCCAGCCCGTCACCTGCAACGTGGCCCACCCAGCCACCAACACCAAAGTGGACAAGACCGTTGCGCCCTCGACATGCAGCAAGCCCACGTGCCCACCCCCTGAACTCCTGGGGGGACCGTCTGTCTTCATCTTCCCCCCAAAACCCAAGGACACCCTCATGATCTCACGCACCCCCGAGGTCACATGCGTGGTGGTGGACGTGAGCCAGGATGACCCCGAGGTGCAGTTCACATGGTACATAAACAACGAGCAGGTGCGCACCGCCCGGCCGCCGCTACGGGAGCAGCAGTTCAACAGCACGATCCGCGTGGTCAGCACCCTCCCCATCGCGCACCAGGACTGGCTGAGGGGCAAGGAGTTCAAGTGCAAAGTCCACAACAAGGCACTCCCGGCCCCCATCGAGAAAACCATCTCCAAAGCCAGAGGGCAGCCCCTGGAGCCGAAGGTCTACACCATGGGCCCTCCCCGGGAGGAGCTGAGCAGCAGGTCGGTCAGCCTGACCTGCATGATCAACGGCTTCTACCCTTCCGACATCTCGGTGGAGTGGGAGAAGAACGGGAAGGCAGAGGACAACTACAAGACCACGCCGGCCGTGCTGGACAGCGACGGCTCCTACTTCCTCTACAGCAAGCTCTCAGTGCCCACGAGTGAGTGGCAGCGGGGCGACGTCTTCACCTGCTCCGTGATGCACGAGGCCTTGCACAACCACTACACGCAGAAGTCCATCTCCCGCTCTCCGGGTAAATGAGCGCGGCCGCGACTCTAGATCATAATCAGCCATACCACATTTGTAGAGGTTTTACTTGCTTTAAAAAACCTCCCACACCTCCCCCTGAACCTGAAACATAAAATGAATGCAATTGTTGTTGTTAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTAAGGCGTAAATTGTAAGCGTTAATATTTTGTTAAAATTCGCGTTAAATTTTTGTTAAATCAGCTCATTTTTTAACCAATAGGCCGAAATCGGCAAAATCCCTTATAAATCAAAAGAATAGACCGAGATAGGGTTGAGTGTTGTTCCAGTTTGGAACAAGAGTCCACTATTAAAGAACGTGGACTCCAACGTCAAAGGGCGAAAAACCGTCTATCAGGGCGATGGCCCACTACGTGAACCATCACCCTAATCAAGTTTTTTGGGGTCGAGGTGCCGTAAAGCACTAAATCGGAACCCTAAAGGGAGCCCCCGATTTAGAGCTTGACGGGGAAAGCCGGCGAACGTGGCGAGAAAGGAAGGGAAGAAAGCGAAAGGAGCGGGCGCTAGGGCGCTGGCAAGTGTAGCGGTCACGCTGCGCGTAACCACCACACCCGCCGCGCTTAATGCGCCGCTACAGGGCGCGTCagatctTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTGGTTTAGTGAACCGTCAGATCCGCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCC
ウサギκ鎖遺伝子連結用二本鎖DNA断片はウサギκ鎖定常領域(1-312)、連結配列II (1-95)、ポリA付加シグナル(507-513)、CMVプロモーター(1050-1633)、連結配列1(1640-1675)からなる(配列番号85)。
ATCCAGTTGCACCTACTGTCCTCATCTTCCCACCAGCTGCTGATCAGGTGGCAACTGGAACAGTCACCATCGTGTGTGTGGCGAATAAATACTTTCCCGATGTCACCGTCACCTGGGAGGTGGATGGCACCACCCAAACAACTGGCATCGAGAACAGTAAAACACCGCAGAATTCTGCAGATTGTACCTACAACCTCAGCAGCACTCTGACACTGACCAGCACACAGTACAACAGCCACAAAGAGTACACCTGCAAGGTGACCCAGGGCACGACCTCAGTCGTCCAGAGCTTCAACAGGGGTGACTGCTAGAGCGGCCGCGACTCTAGATCATAATCAGCCATACCACATTTGTAGAGGTTTTACTTGCTTTAAAAAACCTCCCACACCTCCCCCTGAACCTGAAACATAAAATGAATGCAATTGTTGTTGTTAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTAAGGCGTAAATTGTAAGCGTTAATATTTTGTTAAAATTCGCGTTAAATTTTTGTTAAATCAGCTCATTTTTTAACCAATAGGCCGAAATCGGCAAAATCCCTTATAAATCAAAAGAATAGACCGAGATAGGGTTGAGTGTTGTTCCAGTTTGGAACAAGAGTCCACTATTAAAGAACGTGGACTCCAACGTCAAAGGGCGAAAAACCGTCTATCAGGGCGATGGCCCACTACGTGAACCATCACCCTAATCAAGTTTTTTGGGGTCGAGGTGCCGTAAAGCACTAAATCGGAACCCTAAAGGGAGCCCCCGATTTAGAGCTTGACGGGGAAAGCCGGCGAACGTGGCGAGAAAGGAAGGGAAGAAAGCGAAAGGAGCGGGCGCTAGGGCGCTGGCAAGTGTAGCGGTCACGCTGCGCGTAACCACCACACCCGCCGCGCTTAATGCGCCGCTACAGGGCGCGTCagatctTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTGGTTTAGTGAACCGTCAGATCCGCTAGCGCTACCGGACTCAGATCCCCCCCCCCCCC
Claims (21)
- 非ヒト動物からリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を目的抗原にin vitroで感作させるか、または、非ヒト動物を目的抗原で免疫し、
免疫成立後の非ヒト動物からリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、
前記感作させた、または採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞と、(1)標識した目的抗原、および(2)形質細胞および/または形質芽細胞に選択的に結合する標識物質とを混合し、
前記(1)標識した目的抗原および(2)標識物質が結合した細胞を選択することを含む、
目的抗原に特異的に結合する形質細胞および形質芽細胞の少なくとも一方を選択する方法。 - ヒトからリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を目的抗原にin vitroで感作させるか、または目的抗原に対する抗体を有するヒトからリンパ液、リンパ組織、血球試料又は骨髄由来の細胞を採取し、
前記感作させた、または採取したリンパ液、リンパ組織、血球試料又は骨髄由来の細胞と、(1)標識した目的抗原と(2)形質細胞および/または形質芽細胞を選択的に結合する標識物質を混合し、
前記(1)標識した目的抗原および(2)標識物質が結合した細胞を選択することを含む、
目的抗原に特異的に結合するヒトの形質細胞および形質芽細胞の少なくとも一方を選択する方法。 - 請求項1または2に記載の方法で目的抗原に特異的に結合する形質細胞および形質芽細胞の少なくとも一方の細胞を選択し、
選択した細胞から目的抗原に対する抗体遺伝子を採取し、その塩基配列を同定し、
同定した遺伝子の塩基配列に基づいて前記抗体または抗体の断片を調製する、
ことを含む目的抗原に特異的な抗体または抗体の断片の製造方法。 - 形質細胞および/または形質芽細胞に選択的に結合する標識物質が、細胞の小胞体に対する染色選択性が、小胞体以外の細胞小器官に対する染色選択性に比べて高い蛍光プローブであって、該蛍光プローブによる染色により、形質細胞及び形質芽細胞と形質細胞及び形質芽細胞以外の細胞とを識別可能な、形質細胞及び/又は形質芽細胞の同定又は単離に用いるための蛍光プローブである請求項1~3のいずれか1項に記載の方法。
- (1)両親媒でカチオニックであり、かつ中程度の脂溶性を有する物質、および(2)小胞体局在を示すタンパク質に対して一定以上の親和性を有する物質から成る群から選ばれる請求項4に記載の方法。
- 前記両親媒は、両親媒性インデックス(AI)が、+6>AI>0であり、中程度の脂溶性は、疎水性インデックス(logP)が、+6>logP>0であり、一定以上の親和性は、解離定数が0.1μM~0.1nMの範囲である請求項5に記載の方法。
- 前記小胞体以外の細胞小器官が、形質膜、ミトコンドリア、ゴルジ体、リソソーム、パーオキソーム、核、中心体、細胞質基質、ファゴソーム、エンドソーム、又はアグリソームである請求項4~6のいずれか1項に記載の方法。
- 前記蛍光プローブが、蛍光標識glibenclamide、蛍光標識Brefeldin A、蛍光プローブ、および蛍光タンパク質から成る群から選ばれる請求項4~7のいずれか1項に記載の方法。
- 配列表の配列番号1で示される塩基配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域の遺伝子または配列表の配列番号4で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域のペプチドをコードする遺伝子。
- 配列表の配列番号2で示される塩基配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域の遺伝子または配列表の配列番号5で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域のペプチドをコードする遺伝子。
- 配列表の配列番号3で示される塩基配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域の遺伝子または配列表の配列番号6で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域のペプチドをコードする遺伝子。
- 配列表の配列番号4で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖定常領域のペプチド。
- 配列表の配列番号5で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖定常領域のペプチド。
- 配列表の配列番号6で示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のλ鎖定常領域のペプチド。
- 配列表の配列番号7~18のいずれかで示されるヒトインスリンに対するモルモット抗体のγ鎖可変領域の遺伝子または配列番号19~30及び89~91のいずれかで示されるヒトインスリンに対するモルモット抗体のγ鎖可変領域のペプチドをコードする遺伝子。
- 配列表の配列番号31~42のいずれかで示されるヒトインスリンに対するモルモット抗体のκ鎖可変領域の遺伝子または配列番号43~54及び86~88のいずれかで示されるヒトインスリンに対するモルモット抗体のκ鎖可変領域のペプチドをコードする遺伝子。
- 配列番号19~30及び89~91のいずれかで示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のγ鎖可変領域のペプチド。
- 配列番号43~54及び86~88のいずれかで示されるアミノ酸配列を有するヒトインスリンに対するモルモット抗体のκ鎖可変領域のペプチド。
- 可変領域として配列番号19~30及び89~91のいずれかで示されるアミノ酸配列を有し、かつ定常領域として配列番号4で示されるアミノ酸配列を有するγ鎖を有する、ヒトインスリンに対するモルモットモノクローナル抗体。
- 可変領域として配列番号43~54及び86~88のいずれかで示されるアミノ酸配列を有し、かつ定常領域として配列番号5で示されるアミノ酸配列を有するκ鎖を有する、ヒトインスリンに対するモルモットモノクローナル抗体。
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CN103534352B (zh) | 2016-12-28 |
EP2703485A4 (en) | 2015-08-12 |
US20140031528A1 (en) | 2014-01-30 |
JP5963746B2 (ja) | 2016-08-03 |
JPWO2012133572A1 (ja) | 2014-07-28 |
US9487583B2 (en) | 2016-11-08 |
KR20140032394A (ko) | 2014-03-14 |
CN103534352A (zh) | 2014-01-22 |
EP2703485A1 (en) | 2014-03-05 |
EP2703485B1 (en) | 2018-12-26 |
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