WO2012115241A1 - FcγRIIb特異的Fc抗体 - Google Patents
FcγRIIb特異的Fc抗体 Download PDFInfo
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- WO2012115241A1 WO2012115241A1 PCT/JP2012/054624 JP2012054624W WO2012115241A1 WO 2012115241 A1 WO2012115241 A1 WO 2012115241A1 JP 2012054624 W JP2012054624 W JP 2012054624W WO 2012115241 A1 WO2012115241 A1 WO 2012115241A1
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Definitions
- the present invention introduces an amino acid substitution in the Fc region of IgG as compared to the parent polypeptide, so that the H-type (H type) in which the 131st amino acid of the EU numbering in Fc ⁇ RIIa is His and the R type that is Arg.
- H type H-type
- a polypeptide comprising the Fc region in which the binding activity is maintained or decreased with respect to Fc ⁇ RIIa of any gene polymorphism of (R type) and the binding activity to Fc ⁇ RIIb is enhanced, a pharmaceutical composition containing the polypeptide
- the present invention relates to a therapeutic or prophylactic agent for immunoinflammatory diseases containing the polypeptide, and a method for producing them.
- the present invention compares Fc ⁇ RIIa with any gene polymorphism of H type (H type) in which the amino acid number 131 of the EU is His and R type (R type) which is Arg, compared to the parent polypeptide. Further, the present invention relates to a method for maintaining or decreasing the binding activity and enhancing the binding activity for Fc ⁇ RIIb, and a method for suppressing the production of an antibody when administered to a living body as compared with a parent polypeptide. Furthermore, in the present invention, compared to the parent polypeptide, Fc ⁇ RIIa is a polymorphic Fc ⁇ RIIa of either H type (H type) whose 131st amino acid is His or R type (R type) which is Arg. Even when the binding activity is maintained or reduced and the Fc ⁇ RIIb binding activity is enhanced, and when administered to the living body, antibody production is suppressed compared to the parent polypeptide. The present invention relates to a method for producing a polypeptide.
- Non-patent Documents 1 and 2 Antibodies are attracting attention as pharmaceuticals because of their high stability in blood and few side effects (Non-patent Documents 1 and 2). Most antibody drugs currently on the market are antibodies of the human IgG1 subclass. As one of the functions of IgG class antibodies, antibody-dependent cytotoxic activity (hereinafter referred to as ADCC activity) is known (Non-patent Document 3). In order for an antibody to exhibit ADCC activity, the Fc region of the antibody and the Fc ⁇ receptor (hereinafter referred to as Fc ⁇ R), which is an antibody-bound receptor present on the surface of effector cells such as killer cells, natural killer cells, and activated macrophages )) Is necessary.
- Fc ⁇ R Fc ⁇ receptor
- the Fc ⁇ R protein family includes Fc ⁇ RIa (CD64A), Fc ⁇ RIIa (CD32A), Fc ⁇ RIIb (CD32B), Fc ⁇ RIIIa (CD16A), and Fc ⁇ RIIIb (CD16B) isoforms.
- Fc ⁇ RIa, Fc ⁇ RIIa, and Fc ⁇ RIIIa are called active Fc ⁇ R because they have an immunoactive function, and Fc ⁇ RIIb has an immunosuppressive function, and is called inhibitory Fc ⁇ R (Non-patent Document 8).
- Fc ⁇ R When activated Fc ⁇ R is cross-linked with an immune complex, it induces phosphorylation of intracellular receptors or immunoreceptorsrostyrosine-based activating motifs (ITAMs) contained in FcR common ⁇ -chain, which is a signal transduction agent Activating SYK and initiating an activation signal cascade causes an inflammatory immune response (Non-patent Document 9).
- ITAMs immunoreceptorsrostyrosine-based activating motifs
- Fc ⁇ RIIb is the only Fc ⁇ R expressed in B cells (Non-patent Document 10). It has been reported that the primary immunity of B cells is suppressed by the interaction of the Fc region of the antibody with Fc ⁇ RIIb (Non-patent Document 11). In addition, when Fc ⁇ RIIb and B cell receptor (BCR) on B cells are cross-linked via immune complexes in blood, B cell activation is suppressed and B cell antibody production is suppressed. It is reported that it is suppressed (Non-patent Document 12).
- ITIM immunoreceptor tyrosine-based inhibitory motif
- Non-Patent Document 16 by associating only Fc ⁇ RIIb, it is reported that calcium influx due to B cell proliferation and BCR cross-linking is transiently suppressed without apoptosis of IgM-producing B cells independent of BCR.
- Fc ⁇ RIIb is also expressed on dendritic cells, macrophages, activated neutrophils, mast cells, and basophils. Also in these cells, Fc ⁇ RIIb inhibits the function of active Fc ⁇ R such as phagocytosis and release of inflammatory cytokines and suppresses inflammatory immune responses (Non-patent Document 8).
- Fc ⁇ RIIb knockout mice humoral immunity is not properly controlled (Non-patent Document 17), sensitivity to collagen-induced arthritis (CIA) is increased (Non-patent Document 18), and lupus-like symptoms are exhibited. In addition, it has been reported that the symptoms of a Goodpasture syndrome-like condition are exhibited (Non-patent Document 19).
- Fc ⁇ RIIb has been reported to be associated with human autoimmune diseases.
- SLE systemic lupus erythematosus
- Non-patent Document 20 Non-patent document 21, Non-patent document 22, Non-patent document 23, Non-patent document Patent Document 24
- decreased expression of Fc ⁇ RIIb on the surface of B cells of SLE patients have been reported (Non-patent Document 25, Non-Patent Document 26).
- Fc ⁇ RIIb is thought to play a role in controlling autoimmune diseases and inflammatory diseases, mainly involving B cells, and controls autoimmune diseases and inflammatory diseases. Is a promising target molecule.
- Non-patent Document 27 Development of antibody drugs with immunosuppressive properties compared to IgG1 by using the Fc region with enhanced binding to Fc ⁇ RIIb or improved Fc ⁇ RIIb binding selectivity compared to active Fc ⁇ R There is a possibility.
- the use of an antibody having a variable region that binds to BCR and an Fc that has enhanced binding to Fc ⁇ RIIb has been suggested to inhibit B cell activation (Non-patent Document 28).
- Non-patent Document 29 It has been reported that the IgM concentration is maintained, but the human IgE concentration decreases. It has been reported that CD79b and Fc ⁇ RIIb, which form not only IgE but also B-cell receptor complex, were cross-linked with an antibody, which suppressed B cell proliferation in vitro and alleviated symptoms in a collagen arthritis model. (Non-patent document 30).
- Fc ⁇ RI and Fc ⁇ RIIb on mast cells are combined using a molecule that fuses the Fc portion of IgE that binds to Fc ⁇ RI, the receptor for IgE, and the Fc portion of IgG that has enhanced binding to Fc ⁇ RIIb. It has been reported that cross-linking causes phosphorylation of Fc ⁇ RIIb and suppresses Fc ⁇ RI-dependent calcium influx, which enhances binding to Fc ⁇ RIIb and inhibits degranulation through stimulation of Fc ⁇ RIIb. This suggests that this is possible (Non-patent Document 31). These facts suggest that antibodies having Fc with improved Fc ⁇ RIIb binding activity are promising as therapeutic agents for inflammatory diseases such as autoimmune diseases.
- Non-patent Document 32 shows that the anti-tumor effect of an anti-CD40 antibody is enhanced by using an antibody having enhanced binding to Fc ⁇ RIIb.
- an antibody with enhanced binding to Fc ⁇ RIIb is expected to have an effect of enhancing the agonistic action of agonist antibodies including antibodies against the anti-TNF receptor family.
- Non-patent Document 28 There have been reports on antibodies with Fc that have improved Fc ⁇ RIIb binding activity (Non-patent Document 28).
- the Fc ⁇ RIIb binding activity was improved by adding modifications such as S267E / L328F, G236D / S267E, and S239D / S267E to the Fc region of the antibody.
- the antibody introduced with the mutation of S267E / L328F bound most strongly to Fc ⁇ RIIb, and the binding of Fc ⁇ RIa and Fc ⁇ RIIa to the H type was maintained at the same level as that of natural IgG1.
- this modification increased the binding of Fc ⁇ RIIa to the R-type by several hundred times as much as the binding to Fc ⁇ RIIb.
- Patent Document 5 Even if the binding to Fc ⁇ RIIb is enhanced compared to IgG1, cells such as platelets that do not express Fc ⁇ RIIb but express Fc ⁇ RIIa (Non-patent Document 8) are not enhanced binding to Fc ⁇ RIIb but to Fc ⁇ RIIa. Only the effect of enhanced binding is thought to affect. For example, it is known that the risk of thromboembolism is increased in a group of patients administered with bevacizumab, an antibody against VEGF (Non-patent Document 38).
- Non-patent Document 39 thromboembolism was observed in a clinical development test of an antibody against CD40 ligand, and the clinical trial was discontinued (Non-patent Document 39).
- Non-Patent Document 41 In systemic lupus erythematosus, one of the autoimmune diseases, there is a report that platelets are activated by an Fc ⁇ RIIa-dependent mechanism, and that platelet activation correlates with severity (Non-patent Document 42).
- Fc with enhanced binding to Fc ⁇ RIIb is significantly enhanced compared to native IgG1 for Fc ⁇ RIIa R type, so as a drug for patients with Fc ⁇ RIIa R type
- the value is significantly reduced.
- the Fc ⁇ RIIa H-type and R-type are observed at almost the same frequency in Caucasian and African-American (Non-patent document 44, Non-patent document 45). Therefore, when this Fc is used for the treatment of autoimmune diseases, the number of patients that can be safely used while enjoying the effect as a pharmaceutical is limited.
- Fc ⁇ RIIb is expressed in addition to Fc ⁇ RIIb on the surface of dendritic cells, even if binding to inhibitory Fc ⁇ RIIb is enhanced, if binding to active Fc ⁇ RIIa is also enhanced, the result is It is thought to promote maturation of dendritic cells. That is, it is considered that improving not only the binding activity to Fc ⁇ RIIb but also the ratio of the binding activity to Fc ⁇ RIIb to the binding activity to Fc ⁇ RIIa is important for bringing an immunosuppressive action to the antibody.
- Fc ⁇ RIIb plays an important role in the above-described agonist antibodies, enhancement of its binding activity is expected to enhance agonist activity.
- Fc ⁇ RIIa is enhanced in the same manner, undesired ADCC activity, ADCP activity, etc. may be exhibited, and side effects may occur. From such a viewpoint, it is preferable that the binding activity can be selectively enhanced with respect to Fc ⁇ RIIb.
- Fc ⁇ RIIb is one of the active Fc ⁇ Rs
- Fc ⁇ RIIa is 93% identical in sequence to the extracellular region, very similar in structure
- Fc ⁇ RIIa is a H type whose 131st amino acid is His as a gene polymorphism.
- H type H type
- RA type R type
- Patent Document 5 also reports a mutant with enhanced Fc ⁇ RIIb binding activity, but the degree is weak, and the development of a mutant having the above properties has been demanded.
- the present invention has been made in view of such a situation, and its purpose is to introduce an amino acid substitution in the Fc region of IgG as compared to the parent polypeptide, whereby the amino acid at position 131 of EU numbering in Fc ⁇ RIIa.
- the object is to provide a polypeptide comprising a region, a pharmaceutical composition containing the polypeptide, a therapeutic or preventive agent for an immunoinflammatory disease containing the polypeptide, and a method for producing them.
- Another object of the present invention is to provide a method for maintaining or decreasing the binding activity and enhancing the binding activity for Fc ⁇ RIIb, and a method for suppressing the production of an antibody when administered to a living body as compared with a parent polypeptide.
- Fc ⁇ RIIa of Fc ⁇ RIIa which is a polymorphism of either H type (H type) where the 131st amino acid is His or R type (R type) which is Arg.
- H type H type
- R type R type
- the present inventors have intensively studied a polypeptide containing the Fc region in which Fc-mediated binding to Fc ⁇ RIIa is decreased and binding to Fc ⁇ RIIb is enhanced compared to the parent polypeptide.
- the present inventors showed that Fc ⁇ RIIb binding activity was observed in a polypeptide comprising an antibody Fc region containing a modification that replaces Pro at position 238 of EU number with Asp or a modification that replaces Leu at position 328 of EU number with Glu. It was found that the binding activity through the Fc region was reduced against Fc ⁇ RIIa of both H-type and R-type gene polymorphisms.
- the binding activity to Fc ⁇ RIIb is enhanced, and both gene polymorphisms of H type and R type It was found that the binding activity through the Fc region is maintained or reduced even for Fc ⁇ RIIa.
- the present invention relates to the following.
- a polypeptide variant comprising an antibody Fc region in which at least one amino acid has been modified, wherein the binding activity to Fc ⁇ RIIa (R type) and Fc ⁇ RIIa (H type) is maintained or decreased as compared to the parent polypeptide
- Amino acid modification is as follows: substitution of EU numbering 238th Pro with Asp, EU numbering 237th Gly substitution with Trp, EU numbering 237th Gly substitution with Phe, EU numbering 267th Ser Substitution to Val, EU numbering 267th Ser to Gln, EU numbering 268His to Asn, EU numbering 271st Pro to Gly, EU numbering 326th Lys Leu Substitution to EU numbering 326th Lys to Gln, EU numbering 326th Lys to Glu, EU numbering 326th Lys to Met, EU numbering 239th Ser to Asp Substitution, substitution of EU numbering 267 Ser to Ala, substitution of EU numbering 234 Leu to Trp, substitution of EU numbering 234 Leu to Tyr, substitution of EU numbering 237 Gly to Ala, EU numbering 237th Gly replacement with Asp, EU number 237th Gly to Glu, EU numbering 237th Gly to Leu, EU numbering 237th Gly to to
- a polypeptide comprising an antibody Fc region has binding activity to Fc ⁇ RIIa (R type) and Fc ⁇ RIIa (H type) as compared to a parent polypeptide, comprising adding at least one amino acid modification to the Fc region.
- the amino acid modification is substitution of Pro at 238th EU number with Asp or substitution of EU numbering 328 Leu with Glu.
- Amino acid modification is the substitution of EU numbering 238th Pro to Asp, EU numbering 237th Gly to Trp, EU numbering 237th Gly to Phe, EU numbering 267th Ser Substitution to Val, EU numbering 267th Ser to Gln, EU numbering 268His to Asn, EU numbering 271st Pro to Gly, EU numbering 326th Lys Leu Substitution to EU numbering 326th Lys to Gln, EU numbering 326th Lys to Glu, EU numbering 326th Lys to Met, EU numbering 239th Ser to Asp Substitution, substitution of EU numbering 267 Ser to Ala, substitution of EU numbering 234 Leu to Trp, substitution of EU numbering 234 Leu to Tyr, substitution of EU numbering 237 Gly to Ala, EU numbering 237th Gly place in Asp EU numbering 237th Gly to Glu, EU numbering 237th Gly to Leu, EU numbering 237th Gly to Met, EU number
- a polypeptide comprising an antibody Fc region has binding activity to Fc ⁇ RIIa (R type) and Fc ⁇ RIIa (H type) as compared to a parent polypeptide, comprising adding at least one amino acid modification to the Fc region.
- a method for producing a polypeptide that is maintained or reduced and has enhanced binding activity to Fc ⁇ RIIb, wherein the amino acid modification is substitution of EU at number 238 Pro to Asp, or EU numbering 328 at Leu Glu A method that is a replacement of.
- Amino acid modification is the substitution of Asp at the EU numbering 238th Pro, and the substitution of Gly at the EU numbering 237th Gly, the substitution of The at the EU numbering 237th Gly, the Ser at the EU numbering 267th Substitution to Val, EU numbering 267th Ser to Gln, EU numbering 268His to Asn, EU numbering 271st Pro to Gly, EU numbering 326th Lys Leu Substitution to EU numbering 326th Lys to Gln, EU numbering 326th Lys to Glu, EU numbering 326th Lys to Met, EU numbering 239th Ser to Asp Substitution, substitution of EU numbering 267 Ser to Ala, substitution of EU numbering 234 Leu to Trp, substitution of EU numbering 234 Leu to Tyr, substitution of EU numbering 237 Gly to Ala, EU numbering 237th Gly place in Asp EU numbering 237th Gly to Glu, EU numbering 237th Gly to Leu, EU
- polypeptide containing the antibody Fc region is an IgG antibody.
- polypeptide containing the antibody Fc region is an Fc fusion protein molecule.
- a pharmaceutical composition comprising the polypeptide according to any one of [1] to [10], [21].
- a therapeutic or prophylactic agent for an immunoinflammatory disease containing the polypeptide according to any one of [1] to [10], [21].
- the therapeutic or prophylactic agent according to [24], wherein the immunoinflammatory disease is an autoimmune disease and is considered to be a disease caused by production of an antibody against a self antigen.
- a disease therapeutic agent comprising the polypeptide according to any one of [1] to [10], [21], wherein the disease is a disease in which a protein necessary for a living body is deficient .
- An antiviral agent comprising the polypeptide according to any one of [1] to [10], [21].
- the present invention also relates to a method for treating or preventing an immunoinflammatory disease, comprising the step of administering to the subject the polypeptide of the present invention or the polypeptide produced by the production method of the present invention.
- the present invention also relates to a kit for use in the therapeutic or prophylactic method of the present invention, comprising the polypeptide of the present invention or the polypeptide produced by the production method of the present invention, or the pharmaceutical composition of the present invention.
- the present invention also relates to the use of the polypeptide of the present invention or the polypeptide produced by the production method of the present invention in the manufacture of a therapeutic or prophylactic agent for immunoinflammatory diseases.
- the present invention also relates to the polypeptide of the present invention or the polypeptide produced by the production method of the present invention for use in the therapeutic or prophylactic method of the present invention.
- the present invention also includes the step of inhibiting the activation of B cells, mast cells, dendritic cells and / or basophils, comprising the step of administering to the subject the polypeptide of the present invention or the polypeptide produced by the production method of the present invention.
- the present invention also relates to a kit for use in the inhibition method of the present invention, comprising the polypeptide of the present invention, the polypeptide produced by the production method of the present invention, or the pharmaceutical composition of the present invention.
- the present invention also relates to the use of the polypeptide of the present invention or the polypeptide produced by the production method of the present invention in the production of a B cell, mast cell, dendritic cell and / or basophil activation inhibitor. Moreover, this invention relates to the polypeptide manufactured by the polypeptide of this invention, or the manufacturing method of this invention for using for the suppression method of this invention. The present invention also relates to a method for treating a disease deficient in a protein necessary for a living body, comprising a step of administering to the subject the polypeptide of the present invention or the polypeptide produced by the production method of the present invention.
- the present invention also relates to a kit for use in the treatment method of the present invention, comprising the polypeptide of the present invention, the polypeptide produced by the production method of the present invention, or the pharmaceutical composition of the present invention.
- the present invention also relates to the use of the polypeptide of the present invention or the polypeptide produced by the production method of the present invention in the production of a therapeutic agent for a disease lacking a protein necessary for a living body.
- the present invention also relates to the polypeptide of the present invention or the polypeptide produced by the production method of the present invention for use in the therapeutic method of the present invention.
- the present invention also relates to a virus suppression method comprising the step of administering the polypeptide of the present invention or the polypeptide produced by the production method of the present invention to a subject.
- the present invention also relates to a kit for use in the inhibition method of the present invention, comprising the polypeptide of the present invention, the polypeptide produced by the production method of the present invention, or the pharmaceutical composition of the present invention.
- the present invention also relates to the use of the polypeptide of the present invention or the polypeptide produced by the production method of the present invention in the production of an antiviral agent.
- this invention relates to the polypeptide manufactured by the polypeptide of this invention, or the manufacturing method of this invention for using for the suppression method of this invention.
- a polypeptide comprising an Fc region that maintains or decreases binding activity to Fc ⁇ RIIa of both H-type and R-type gene polymorphisms and has enhanced binding activity to Fc ⁇ RIIb.
- Peptides were provided. Patients with either R type or H type polymorphism by using the polypeptide with enhanced selectivity for binding to Fc ⁇ RIIb against any Fc ⁇ RIIa gene polymorphism (H type, R type) In contrast, it is possible to transmit an inhibitory signal of the inflammatory immune response via phosphorylation of ITIM of Fc ⁇ RIIb.
- the Fc of an antibody the property of selectively binding to Fc ⁇ RIIb, there is a possibility that anti-antibody production can be suppressed through an immunosuppressive action via Fc ⁇ RIIb.
- the horizontal axis represents the relative binding activity value of each PD ⁇ variant to Fc ⁇ RIIb, and the vertical axis represents the relative binding activity value of each PD variant to Fc ⁇ RIIa R type.
- the amount of binding of each PD variant to each Fc ⁇ R is the value of the binding amount to each Fc ⁇ R of IL6R-F652 ⁇ ⁇ (modified Fc in which EU numbering 238th Pro is replaced with Asp), which is an antibody before the introduction of the control as a control.
- the value further divided by 100 was used as the value of the relative binding activity of each PD variant to each Fc ⁇ R.
- the plot F652 in the figure shows the value of IL6R-F652.
- the vertical axis represents the relative binding activity value of Fc ⁇ RIIb to each modified product introduced into GpH7-B3 without P238D modification, and the horizontal axis represents each modified product introduced into IL6R-F652 with P238D modification.
- Relative binding activity values for Fc ⁇ RIIb are shown.
- the value of the binding amount of each variant to Fc ⁇ RIIb was divided by the value of the binding amount of the antibody to Fc ⁇ RIIb before the introduction of the modification, and the value obtained by multiplying by 100 was used as the relative binding activity value.
- the crystal structure of the Fc (P238D) / Fc ⁇ RIIb extracellular region complex and the model structure of the Fc (WT) / Fc ⁇ RIIb extracellular region complex are based on the distance between C ⁇ atoms to the Fc ⁇ RIIb extracellular region and FcFCH2 domain A.
- FIG. 1 represents the relative binding activity value of each 2B variant to Fc ⁇ RIIb, and the vertical axis represents the relative binding activity value of each 2B variant to the Fc ⁇ RIIa type R.
- FIG. 7 is a diagram showing the Fc Chain A EU numbering 233rd Glu and its peripheral residues in the Fc ⁇ RIIb extracellular region in the crystal structure of the Fc ⁇ ⁇ (P238D) / Fc ⁇ RIIb extracellular region complex.
- FIG. 3 is a diagram showing the EU numbering 330th Ala of Fc Chain A in the crystal structure of the Fc (P238D) / Fc ⁇ RIIb extracellular region complex and its peripheral residues in the Fc ⁇ RIIb extracellular region.
- the crystal structures of Fc (P238D) / Fc ⁇ RIIb extracellular region complex and Fc (WT) / Fc ⁇ RIIIa extracellular region complex are superimposed on Fc Chain B by the least square method based on the distance between C ⁇ atoms, It is the figure which showed the structure of 271st Pro of EU numbering of Fc
- the present invention provides a polypeptide comprising the Fc region, wherein the binding activity to Fc ⁇ RIIa is maintained or decreased and the binding activity to Fc ⁇ RIIb is enhanced by introducing an amino acid substitution into the Fc region of IgG as compared to the parent polypeptide.
- a polypeptide containing an antibody Fc region containing a substitution of EU numbering 238th Pro to Asp or EU numbering 328th Leu to Glu, and a substitution of EU numbering 238th Pro to Asp and Polypeptides comprising antibody Fc regions comprising combinations with several specific amino acid substitutions are provided.
- the present invention provides a method for maintaining or decreasing the binding activity of any gene polymorphism to Fc ⁇ RIIa and enhancing the binding activity to Fc ⁇ RIIb as compared to the parent polypeptide.
- the present invention also provides a method of suppressing antibody production when administered to a living body compared to the parent polypeptide.
- the polypeptide in the present invention usually refers to peptides and proteins having a length of about 10 amino acids or more. Moreover, although it is normally a polypeptide derived from a living organism
- Fc ⁇ receptor refers to a receptor that can bind to the Fc region of IgG1, IgG2, IgG3, IgG4 monoclonal antibodies, and is substantially an Fc ⁇ receptor gene.
- Fc ⁇ RI CD64
- isoforms Fc ⁇ RIa including allotypes H131 (H) and R131 (R)
- Fc ⁇ RIIb Fc ⁇ RIIb-1 and Fc ⁇ RIIb- 2
- Fc ⁇ RII CD32
- Fc ⁇ RIII CD16
- isoforms Fc ⁇ RIIIa including allotypes V158 and F158
- Fc ⁇ RIIIb including allotypes Fc ⁇ RIIIb-NA1 and Fc ⁇ RIIIb-NA2
- any undiscovered Human Fc ⁇ Rs or Fc ⁇ R isoforms or allotypes but are not limited to these.
- Fc ⁇ R includes, but is not limited to, those derived from human, mouse, rat, rabbit and monkey, and may be derived from any organism.
- Mouse Fc ⁇ Rs include Fc ⁇ RI (CD64), Fc ⁇ RII (CD32), Fc ⁇ RIII (CD16) and Fc ⁇ RIII-2 (CD16-2), as well as any undiscovered mouse Fc ⁇ Rs or Fc ⁇ R isoforms or allotypes. It is not limited to. Suitable examples of such Fc ⁇ receptors include human Fc ⁇ RI (CD64), Fc ⁇ RIIA (CD32), Fc ⁇ RIIB (CD32), Fc ⁇ RIIIA (CD16) and / or Fc ⁇ RIIIB (CD16).
- the polynucleotide sequence and amino acid sequence of Fc ⁇ RI are shown in SEQ ID NOs: 1 (NM_000566.3) and 2 (NP_000557.1), respectively.
- the polynucleotide sequence and amino acid sequence of Fc ⁇ RIIA are shown in SEQ ID NOs: 3 (BC020823.1) and 4 (AAH20823.1), respectively.
- the polynucleotide sequence and amino acid sequence of Fc ⁇ RIIB are shown in SEQ ID NOs: 5 (BC146678.1) and 6 (AAI46679.1), respectively.
- the polynucleotide and amino acid sequences of Fc ⁇ RIIIA are shown in SEQ ID NOs: 7 (BC033678.1) and 8 (AAH33678.1), respectively.
- the polynucleotide sequence and amino acid sequence of Fc ⁇ RIIIB are described in SEQ ID NOs: 9 (BC128562.1) and 10 (AAI28563.1), respectively (the RefSeq registration number
- Fc ⁇ RIIa has two gene polymorphisms in which the 131st amino acid of Fc ⁇ RIIa is substituted with histidine (H type) or arginine (R type) (J. Exp. Med, 172, 19-25, 1990).
- parent polypeptide means a polypeptide that is the basis for production of a polypeptide containing the antibody Fc region of the present invention. That is, it can be a polypeptide comprising an antibody Fc region, wherein at least one amino acid in the Fc region has not been modified.
- the parent polypeptide in the present invention may be, for example, a polypeptide containing an Fc region of a natural IgG, or a polypeptide containing an Fc region of IgG in which a modification other than the amino acid modification of the present invention is added to a natural IgG. It may be.
- Natural IgG refers to a polypeptide that includes the same amino acid sequence as IgG found in nature and belongs to the class of antibodies substantially encoded by immunoglobulin gamma genes.
- natural human IgG means natural human IgG1, natural human IgG2, natural human IgG3, natural human IgG4, and the like.
- Naturally-occurring IgG includes naturally occurring mutants.
- the Fc region of natural IgG means an Fc region including the same amino acid sequence as an Fc region originating from IgG found in nature.
- the Fc region of natural IgG is shown in FIG. 5 (SEQ ID NOs: 11 to 14).
- Fc region originating from natural human IgG1, Fc region originating from natural human IgG2, natural human IgG3 The Fc region originated from, and the Fc region originated from natural human IgG4.
- the Fc region of natural IgG includes mutants that naturally occur therefrom.
- the polypeptide or Fc region of the present invention has enhanced binding activity to various Fc ⁇ Rs, or whether the binding activity is maintained or decreased, for example, as shown in this Example, surface plasmon resonance (SPR) ) Immobilize antibodies on sensor chip using BIACORE, an interaction analysis instrument that utilizes the phenomenon, or Protein A, Protein L, Protein A / G, Protein G, anti-lamda chain antibody, anti-kappa chain antibody, antigen peptide, antigen protein It can be judged whether the value of the dissociation constant (KD) obtained from the analysis result of the sensorgram obtained by interacting various Fc ⁇ Rs as analytes with the sensor chip captured by, for example, has decreased or increased.
- KD dissociation constant
- a sensor chip in which Fc ⁇ R is directly immobilized on a sensor chip or immobilized via an anti-tag antibody, etc. it is obtained from analysis of a sensorgram in which a sample such as an antibody to be evaluated interacts as an analyte. It can be judged by whether the value of the dissociation constant (KD) has decreased or increased.
- KD dissociation constant
- the value of the sensorgram before and after the Fc ⁇ R directly immobilized on the sensor chip or the sample of the antibody to be evaluated against the sensor chip immobilized via an anti-tag antibody is interacted as an analyte. It can also be determined whether the amount of change has decreased or increased.
- Fc region binding activity to Fc ⁇ receptors includes ELISA and FACS (fluorescence activated cell sorting), ALPHA screen (Amplified Luminescent Proximity Homogeneous Asssay), BIACORE method using surface plasmon resonance (SPR) phenomenon, etc. (Proc. Natl. Acad. Sci. USA (2006) 103 (11), 4005-4010).
- ALPHA screen is implemented based on the following principle by ALPHA technology using two beads of donor and acceptor.
- a luminescent signal is detected only when the molecule bound to the donor bead interacts biologically with the molecule bound to the acceptor bead and the two beads are in close proximity.
- a photosensitizer in the donor bead excited by the laser converts ambient oxygen into excited singlet oxygen. Singlet oxygen diffuses around the donor bead, and when it reaches the adjacent acceptor bead, it causes a chemiluminescence reaction in the bead, and finally light is emitted.
- the chemiluminescence reaction does not occur because the singlet oxygen produced by the donor bead does not reach the acceptor bead.
- biotin-labeled polypeptide aggregates are bound to donor beads, and Fc ⁇ receptors tagged with glutathione S-transferase (GST) are bound to acceptor beads.
- GST glutathione S-transferase
- the polypeptide assembly containing the wild-type Fc region interacts with the Fc ⁇ receptor to produce a signal of 520-620 nm.
- Polypeptide aggregates containing untagged mutant Fc regions compete with the interaction between polypeptide aggregates containing wild-type Fc regions and Fc ⁇ receptors. Relative binding activity can be determined by quantifying the decrease in fluorescence that results from competition.
- biotinylate polypeptide aggregates such as antibodies using Sulfo-NHS-biotin and the like.
- a method of tagging the Fc ⁇ receptor with GST it is expressed in a cell or the like holding a fusion gene in which a polynucleotide encoding the Fc ⁇ receptor and a polynucleotide encoding GST are fused in-frame.
- a method of purification using a glutathione column can be appropriately employed.
- the obtained signal is suitably analyzed by fitting to a one-site competition model using nonlinear regression analysis using software such as GRAPHPAD PRISM (GraphPad, San Diego).
- the Biacore system takes the shift amount, that is, the mass change at the sensor chip surface on the vertical axis, and displays the time change of mass as measurement data (sensorgram).
- the amount of analyte bound to the ligand captured on the sensor chip surface is determined from the sensorgram. Further, the kinetics: association rate constant (ka) and dissociation rate constant (kd) are obtained from the sensorgram curve, and the dissociation constant (KD) is obtained from the ratio of the constants.
- an inhibition measurement method is also preferably used. Examples of inhibition assays are described in Proc. Natl. Acad. Sci. USA (2006) 103 (11), 4005-4010.
- Polypeptides with reduced Fc ⁇ R binding activity are assayed using essentially the same amount of parent polypeptide and a polypeptide (also referred to as a polypeptide variant) containing at least one amino acid modification in the Fc region of the parent polypeptide.
- a polypeptide also referred to as a polypeptide variant
- the KD value ratio (KD value of polypeptide variant / KD value of parent polypeptide) is preferably 1.25 or more, 2 or more, or 3 or more. More preferably, they are 5 or more, 10 or more, 100 or more, 1000 or more, or 10000 or more.
- the KD value is preferably increased by 1 ⁇ M or more, and increased by 2 ⁇ M or more, 3 ⁇ M or more, 5 ⁇ M or more, 10 ⁇ M or more, 20 ⁇ M or more, 50 ⁇ M or more, 100 ⁇ M or more. More preferably.
- the KD value measured by the above measurement method is preferably 0.0001 ⁇ M or more, 0.001 ⁇ M or more, 0.01 ⁇ M or more, 0.1 ⁇ M or more, 0.5 ⁇ M or more, 1 ⁇ M or more, 2 ⁇ M or more, 3 ⁇ M or more, More preferably, it is 5 ⁇ M or more, 10 ⁇ M or more, 100 ⁇ M or more, or 1000 ⁇ M or more.
- a polypeptide with enhanced binding activity to Fc ⁇ R is an Fc ⁇ R that has essentially stronger binding activity than the parent polypeptide when assayed with essentially the same amount of parent polypeptide and polypeptide variant. The one that combines with.
- the KD value ratio (KD value of parent polypeptide / KD value of polypeptide variant) is preferably 1.25 or more, 2 or more, or 3 or more. More preferably, they are 5 or more, 10 or more, 100 or more, 1000 or more, or 10000 or more. Further, in the KD value measured by the above measurement method, the KD value is preferably decreased by 0.001 ⁇ M or more, 0.01 ⁇ M, 0.1 ⁇ M, 1 ⁇ M or more, 2 ⁇ M or more, 3 ⁇ M or more, 5 ⁇ M or more, 10 ⁇ M or more, 20 ⁇ M or more.
- the KD value measured by the above measurement method is preferably 5 ⁇ M or less, and is 3 ⁇ M or less, 1 ⁇ M or less, 0.5 ⁇ M or less, 0.1 ⁇ M or less, 0.01 ⁇ M or less, 0.001 ⁇ M or less, 0.0001 ⁇ M or less. More preferably it is.
- a polypeptide whose binding activity to Fc ⁇ R is maintained (maintained) is essentially the amount of the parent polypeptide and a polypeptide (also referred to as a polypeptide variant) containing at least one amino acid modification in the Fc region of the parent polypeptide.
- a polypeptide also referred to as a polypeptide variant
- the polypeptide has the binding activity to Fc ⁇ RIIa maintained or decreased and the binding activity to Fc ⁇ RIIb is enhanced is determined by using the KD value of the polypeptide for Fc ⁇ RIIa and the KD value of the polypeptide for Fc ⁇ RIIb. It is possible to judge by this.
- the KD value for Fc ⁇ RIIb of the polypeptide of the present invention is smaller than the KD value for Fc ⁇ RIIb of the parent polypeptide, and the KD value for Fc ⁇ RIIa (R type, H type) of the polypeptide of the present invention is Fc ⁇ RIIa (R type). , H type) is increased or maintained than the KD value.
- the enhanced binding activity to Fc ⁇ RIIb means, for example, that the KD value ratio of [parent polypeptide KD value] / [polypeptide variant KD value] in the KD value measured by the above measurement method is It preferably means 1.6 or more, 2 or more, 3 or more, more preferably 5 or more, 10 or more, 20 or more, 30 or more, 50 or more.
- the KD value ratio of the stronger KD value of the binding activity to (H type) / [the KD value of the stronger binding activity of the parent polypeptide to Fc ⁇ RIIa (R type) and Fc ⁇ RIIa (H type)] is preferably Means 0.7 or more, 1 or more, 2 or more, 3 or more, more preferably 5 or more, 10 or more, 20 or more, 30 or more, 50 or more.
- the polypeptide in the present invention maintains or decreases the binding activity to Fc ⁇ RIIa R type and Fc ⁇ RIIa H type. More preferably, the binding activity is maintained or decreased for Fc ⁇ RIIa R type and Fc ⁇ RIIa H type, and the binding activity is maintained or decreased for Fc ⁇ RIIIa. Furthermore, it is preferable that the binding activity to Fc ⁇ RIa is maintained or decreased.
- the fact that the binding activity to Fc ⁇ RIIIa or Fc ⁇ RIa is maintained or decreased is, for example, that the KD value ratio of [polypeptide variant KD value] / [parent polypeptide KD value] in the KD value measured by the above measurement method is It preferably means 1 or more, 2 or more, 3 or more, more preferably 5 or more, 10 or more, 20 or more, 30 or more, 50 or more.
- the polypeptide of the present invention is a polypeptide having improved binding selectivity for Fc ⁇ RIIb over Fc ⁇ RIIa was determined according to the above example, the ratio of the KD value of Fc ⁇ RIIa to the KD value of Fc ⁇ RIIb of the polypeptide of the present invention ( It is possible to judge by comparing the ratio (KD value for Fc ⁇ RIIa / KD value for Fc ⁇ RIIb) between the KD value for Fc ⁇ RIIa and the KD value for Fc ⁇ RIIb and the KD value for Fc ⁇ RIIb). .
- the polypeptide of the present invention binds to Fc ⁇ RIIb rather than Fc ⁇ RIIa than the parent polypeptide. It can be determined that the selectivity has improved.
- the binding selectivity between Fc ⁇ RIIa (R type) and Fc ⁇ RIIb for example, in the KD value measured by the above-mentioned measurement method, [KD value of polypeptide variant against Fc ⁇ RIIa (R type)] / [Polypeptide variation
- the ratio of the KD value of the body to the Fc ⁇ RIIb] is preferably 1.2 or more, 2 or more, or 3 or more.
- the KD value ratio of the KD value of the body to Fc ⁇ RIIb] is preferably 4.2 or more, 5 or more, or 10 or more. More preferably, they are 20 or more, 30 or more, 50 or more, 100 or more, 200 or more.
- Whether the binding activity of the polypeptide of the present invention to various Fc ⁇ Rs has been maintained, enhanced, or decreased can also be determined by the increase or decrease in the binding amount of various Fc ⁇ Rs to the polypeptide of the present invention determined according to the above example.
- the amount of each Fc ⁇ R bound to the polypeptide captures the polypeptide on the sensor chip, and the difference in the RU value in the sensorgram changed before and after the various Fc ⁇ R analytes interacted with each polypeptide. It means the value divided by the difference in the RU values in the sensorgram that changed before and after.
- the polypeptide of the present invention maintains or decreases the binding activity to Fc ⁇ RIIa (R type, H type) and has an enhanced binding activity to Fc ⁇ RIIb was determined according to the above example, and the binding of the polypeptide to Fc ⁇ RIIa It can be determined by using the amount and the amount of the polypeptide bound to Fc ⁇ RIIb.
- the amount of binding of the polypeptide of the present invention to Fc ⁇ RIIb is greater than the amount of binding of the parent polypeptide to Fc ⁇ RIIb, and the amount of binding of the polypeptide of the present invention to Fc ⁇ RIIa (R type, H type) is Fc ⁇ RIIa (R
- the amount of binding to (type, H type) is equivalent (maintained) or preferably decreased. It is also possible to determine by appropriately combining the binding amount of the polypeptide to Fc ⁇ RIa and the binding amount to Fc ⁇ RIIIa determined according to the above example.
- Fc region refers to a region containing a fragment consisting of a hinge part or a part thereof, CH2 and CH3 domains in an antibody molecule.
- the Fc region of the IgG class is EU numbering (also referred to as EU INDEX in this specification) (see Fig. 5), which means, for example, from the 226th cysteine to the C terminus or the 230th proline to the C terminus. It is not limited to.
- the Fc region can be suitably obtained by partially eluting IgG1, IgG2, IgG3, IgG4 monoclonal antibody and the like with a protease such as pepsin and then re-eluting the fraction adsorbed on the protein A column.
- protease such as pepsin
- Such proteolytic enzymes are not particularly limited as long as they can digest full-length antibodies so that Fab and F (ab ') 2 can be produced in a limited manner by appropriately setting the reaction conditions of the enzyme such as pH.
- pepsin, papain, etc. can be illustrated.
- the present invention includes an Fc region containing a modification in which EU numbering 238th Pro is replaced with Asp or EU numbering 328th Leu in Glu with respect to human IgG (IgG1, IgG2, IgG3, IgG4).
- An antibody constant region is provided.
- the R-type of Fc ⁇ RIa, Fc ⁇ RIIIa, and Fc ⁇ RIIa by introducing a human IgG with a modification in which EU numbering 238th Pro is replaced with Asp or a modification in which EU numbering 328th Leu is replaced with Glu. It is possible to provide a polypeptide that maintains or decreases the binding activity to any gene polymorphism of H type and has enhanced binding activity to Fc ⁇ RIIb.
- the present invention adds a modification to at least one other Fc region to human IgG containing a modification in which EU numbering 238th Pro is replaced with Asp or a modification in which EU numbering 328th Leu is replaced with Glu.
- the modification means any one of substitution, deletion, addition, insertion, or a combination thereof.
- additional modifications can be included. Additional alterations can be selected from, for example, amino acid substitutions, deletions, modifications, or combinations thereof.
- modifications that improve binding selectivity to Fc ⁇ RIIb are preferable to Fc ⁇ RIIa (R type), and modifications that improve binding selectivity to Fc ⁇ RIIb are more preferable than Fc ⁇ RIIa (H type).
- a preferred amino acid substitution as such a modification is, for example, a modification in which Gly at EU numbering 237 is replaced with Trp, a modification in which Gly at EU numbering 237 is replaced with Phe, a modification in which Pro at EU numbering 238 is replaced with Phe, EU numbering 325th Asn is replaced with Met, EU numbering 267th Ser is replaced with Ile, EU numbering 328th Leu is replaced with Asp, EU numbering 267th Ser is replaced with Val Modification, modification with EU numbering 328 Leu replaced with Trp, EU numbering 267th Ser replaced with Gln, EU numbering 267th Ser replaced with Met, EU numbering 236th Gly replaced with Asp Substitution, EU numbering 327, Ala is replaced with Asn, EU numbering 3
- preferred amino acid substitutions are, for example, modifications in which EU numbering 237th Gly is replaced with Trp, EU numbering 237th Gly is replaced with Phe, and EU numbering 267th Ser is replaced with Val.
- amino acid substitution JolImmunol. 2006 Jan 1; 176 (1): 346-56, J Biol Chem. 2006 Aug 18; 281 (33): 23514-24, which improves the binding activity to FcRn, in the antibody constant region portion. ., Int Immunol. 2006 Dec; 18 (12): 1759-69., Nat Biotechnol. 2010 Feb; 28 (2): 157-9., WO / 2006/019447, WO / 2006/053301, WO / 2009 / 086320), amino acid substitution (WO / 2009/041613) for improving the heterogeneity and stability of the antibody may be added.
- polypeptide obtained by imparting the property of promoting the disappearance of an antigen described in WO2011 / 122011 and PCT / JP2011 / 072550 to the polypeptide of the present invention and a plurality of polypeptides described in WO2009 / 125825 and PCT / JP2011 / 077619 Polypeptides imparted with the property of repeatedly binding to the antigen of the molecule are also included in the present invention.
- polypeptide of the present invention include IgG antibodies.
- IgG antibody When an IgG antibody is used as the antibody, the type of the constant region is not limited, and it is possible to use IgG of an isotype (subclass) such as IgG1, IgG2, IgG3, and IgG4.
- the IgG antibody of the present invention is preferably human IgG, more preferably human IgG1 and human IgG4, and the amino acid sequences of the heavy chain constant regions of human IgG1 and human IgG4 are known.
- ⁇ Replace> When substituting an amino acid residue, the purpose is to modify, for example, the following points (a) to (c) by substituting with another amino acid residue.
- Amino acid residues are divided into the following groups based on general side chain properties: (1) Hydrophobicity: norleucine, met, ala, val, leu, ile; (2) Neutral hydrophilicity: cys, ser, thr, asn, gln; (3) Acidity: asp, glu; (4) Basicity: his, lys, arg; (5) Residues that affect chain orientation: gly, pro; and (6) Aromaticity: trp, tyr, phe.
- substitution of amino acid residues within each of these groups is called conservative substitution, while the substitution of amino acid residues between other groups is called non-conservative substitution.
- the substitution in the present invention may be a conservative substitution, a non-conservative substitution, or a combination of a conservative substitution and a non-conservative substitution.
- the modification of the amino acid sequence is prepared by various methods known in the art. These methods include, but are not limited to, site-directed mutagenesis (Hashimoto-Gotoh, T, Mizuno, T, Ogasahara, Y, and Nakagawa, M. (1995) An oligodeoxyribonucleotide- directed dual amber method for site-directed mutagenesis. Gene 152, 271-275, Zoller, MJ, and Smith, M.
- the amino acid modifications of the present invention include post-translational modifications.
- post-translational modifications addition or deletion of sugar chains can be shown.
- the 297th amino acid residue of EU numbering can be modified with a sugar chain.
- the sugar chain structure to be modified is not limited.
- antibodies expressed in eukaryotic cells contain glycosylation in the constant region. Therefore, antibodies expressed in the following cells are usually modified with some sugar chain.
- Mammalian antibody-producing cells ⁇ Eukaryotic cells transformed with an expression vector containing DNA encoding the antibody
- the eukaryotic cells shown here include yeast and animal cells.
- CHO cells and HEK293H cells are representative animal cells for transformation with an expression vector containing DNA encoding an antibody.
- those having no sugar chain modification at this position are also included in the constant region of the present invention.
- An antibody whose constant region is not modified with a sugar chain can be obtained by expressing a gene encoding the antibody in a prokaryotic cell such as Escherichia coli.
- saccharides added to glycans in the Fc region may be added (MAbs. 2010 2010 Sep-Oct; 2 (5): 519-27.).
- the present invention provides an antibody comprising an Fc region in which one of the above-described amino acid sequences is modified.
- antibody in the present invention is used in the broadest sense, and as long as the desired biological activity is exhibited, monoclonal antibodies (including full-length monoclonal antibodies), polyclonal antibodies, antibody variants, antibody fragments, multispecificity Any antibody such as an antibody (multispecific antibody) (for example, a bispecific antibody (bispecific antibody)), a chimeric antibody, or a humanized antibody is included.
- the antibody of the present invention is not limited to the type of antigen, the origin of the antibody, etc., and may be any antibody.
- the origin of the antibody is not particularly limited, and examples thereof include a human antibody, a mouse antibody, a rat antibody, and a rabbit antibody.
- monoclonal antibodies can be produced by the hybridoma method (Kohler and Milstein, steinNature 256: 495 (1975)) or recombinant methods (US Pat. No. 4,816,567). May be. Alternatively, it may be isolated from a phage antibody library (Clackson et al., Nature 352: 624-628 (1991); Marks et al., J. Mol. Biol. 222: 581-597 (1991)).
- Humanized antibodies are also referred to as reshaped human antibodies.
- non-human animals for example, humanized antibodies obtained by grafting mouse antibody CDRs to human antibodies are known.
- General genetic recombination techniques for obtaining humanized antibodies are also known.
- Overlap-Extension-PCR is known as a method for transplanting mouse antibody CDRs into human FRs.
- FR amino acid residues can be substituted so that the CDR of the reshaped human antibody forms an appropriate antigen-binding site.
- amino acid sequence mutations can be introduced into FRs by applying the PCR method used for transplantation of mouse CDRs into human FRs.
- Transgenic animals having all repertoires of human antibody genes are used as immunized animals, and desired by DNA immunization. Human antibodies can be obtained.
- the V region of a human antibody is expressed as a single chain antibody (scFv) on the surface of the phage by the phage display method.
- Phages expressing scFv that bind to the antigen can be selected.
- the DNA sequence encoding the V region of the human antibody that binds to the antigen can be determined.
- the V region sequence is fused in-frame with the sequence of the desired human antibody C region, and then inserted into an appropriate expression vector, whereby an expression vector can be prepared.
- the human antibody is obtained by introducing the expression vector into a suitable expression cell as described above and expressing the gene encoding the human antibody.
- These methods are already known (see International Publications WO1992 / 001047, WO1992 / 020791, WO1993 / 006213, WO1993 / 011236, WO1993 / 019172, WO1995 / 001438, and WO1995 / 015388).
- variable region constituting the antibody of the present invention can be a variable region that recognizes an arbitrary antigen.
- the antigen is not particularly limited, and any antigen may be used.
- an antigen for example, a ligand (cytokine, chemokine, etc.), a receptor, a cancer antigen, an MHC antigen, a differentiation antigen, an immunoglobulin and an immune complex partially containing an immunoglobulin are preferably exemplified.
- cytokines examples include interleukins 1-18, colony stimulating factors (G-CSF, M-CSF, GM-CSF, etc.), interferons (IFN- ⁇ , IFN- ⁇ , IFN- ⁇ , etc.), growth factors ( EGF, FGF, IGF, NGF, PDGF, TGF, HGF, etc.), tumor necrosis factor (TNF- ⁇ , TNF- ⁇ ), lymphotoxin, erythropoietin, leptin, SCF, TPO, MCAF, BMP.
- chemokines examples include CC chemokines such as CCL1 to CCL28, CXC chemokines such as CXCL1 to CXCL17, C chemokines such as XCL1 to XCL2, and CX3C chemokines such as CX3CL1.
- receptors include, for example, hematopoietic factor receptor family, cytokine receptor family, tyrosine kinase type receptor family, serine / threonine kinase type receptor family, TNF receptor family, G protein coupled receptor family, GPI Examples include receptors belonging to the receptor family such as anchor type receptor family, tyrosine phosphatase type receptor family, adhesion factor family, hormone receptor family and the like. Regarding the receptors belonging to these receptor families and their characteristics, a number of documents such as Cooke BA., King RJB., Van der Molen HJ. Ed. New Comprehesive Biochemistry Vol.
- Specific receptors belonging to the above receptor family include, for example, human or mouse erythropoietin (EPO) receptors (Blood (1990) 76 (1), 31-35, Cell (1989) 57 (2), 277- 285), human or mouse granulocyte colony stimulating factor (G-CSF) receptor (Proc. Natl. Acad. Sci. USA. (1990) 87 (22), 8702-8706, mG-CSFR, Cell (1990) 61 (2), 341-350), human or mouse thrombopoietin (TPO) receptor (Proc Natl Acad Sci U S A. (1992) 89 (12), 5640-5644, EMBO J.
- EPO erythropoietin
- human or mouse leptin receptor human or mouse growth hormone (GH) receptor, human or mouse Interleukin (IL) -10 receptor, human or mouse insulin-like growth factor (IGF) -I receptor, human or mouse leukemia inhibitory factor (LIF) receptor, human or mouse ciliary neurotrophic factor (CNTF) receptor A body etc. are illustrated suitably.
- GH growth hormone
- IL Interleukin
- IGF insulin-like growth factor
- LIF human or mouse leukemia inhibitory factor
- CNTF ciliary neurotrophic factor
- Cancer antigens are antigens that are expressed as cells become malignant and are also called tumor-specific antigens.
- abnormal sugar chains appearing on the cell surface and protein molecules when cells become cancerous are also cancer antigens and are also called cancer sugar chain antigens.
- cancer antigens include, for example, GPC3 (Int J Cancer. (2003) 103 (4) that belongs to the GPI-anchored receptor family as the above receptor but is expressed in several cancers including liver cancer. , 455-65), EpCAM expressed in multiple cancers including lung cancer (Proc Natl Acad Sci U S A. (1989) 86 (1), ⁇ ⁇ 27-31), CA19-9, CA15-3, serial SSEA -1 (SLX) and the like are preferable.
- GPC3 Int J Cancer. (2003) 103 (4) that belongs to the GPI-anchored receptor family as the above receptor but is expressed in several cancers including liver cancer. , 455-65
- EpCAM expressed in multiple cancers including lung cancer Proc Natl Acad Sci U S A. (19
- MHC antigens are mainly classified into MHC class I antigen and MHC class II antigen, which includes HLA-A, -B, -C, -E, -F, -G, -H.
- MHC class II antigens include HLA-DR, -DQ, and -DP.
- Immunoglobulins include IgA, IgM, IgD, IgG, and IgE.
- the immune complex includes at least any component of immunoglobulin.
- Other antigens include the following molecules: 17-IA, 4-1BB, 4Dc, 6-keto-PGF1a, 8-iso-PGF2a, 8-oxo-dG, A1 adenosine receptor, A33, ACE, ACE- 2, Activin, Activin A, Activin AB, Activin B, Activin C, Activin RIA, Activin RIA ALK-2, Activin RIB ALK-4, Activin RIIA, Activin RIIB, ADAM10, ADAM12, ADAM15, ADAM17 / TACE, ADAM8 , ADAM9, ADAMTS, ADAMTS4, ADAMTS5, addressin, aFGF, ALCAM, ALK, ALK-1, ALK-7, alpha-1-antitry
- the site to be modified and the number of amino acids to be modified are not particularly limited.
- amino acids present in CDR and / or FR can be appropriately modified.
- the amino acid of the variable region is modified, although not particularly limited, it is preferable that the binding activity is maintained, for example, 50% or more, preferably 80% or more, more preferably 100% or more compared to before modification. It preferably has binding activity. Further, the binding activity may be increased by amino acid modification. For example, the binding activity may be 2 times, 5 times, 10 times, etc., compared to before the modification.
- the amino acid sequence alteration may be at least one of substitution, addition, deletion, and modification of amino acid residues.
- the modification to pyroglutamic acid by pyroglutamylation of N-terminal glutamine of the variable region is a modification well known to those skilled in the art. Therefore, the antibody of the present invention comprises a variable region in which the heavy chain is modified with pyroglutamic acid when the N-terminus of the heavy chain is glutamine.
- variable region of the antibody of the present invention may be of any sequence, mouse antibody, rat antibody, rabbit antibody, goat antibody, camel antibody, humanized antibody obtained by humanizing these non-human antibodies, and human It may be a variable region of an antibody of any origin, such as an antibody.
- “Humanized antibody” refers to an antibody derived from a mammal other than a human, also referred to as a reshaped human antibody, such as a complementarity determination region (CDR) of a mouse antibody to the CDR of a human antibody. It is transplanted.
- CDR complementarity determination region
- variable region of the antibody of the present invention may be capable of repeatedly binding to an antigen by having pH dependency for binding to the antigen (WO2009 / 125825).
- the light chain constant region of an antibody has a ⁇ chain and ⁇ chain type constant region, but any light chain constant region may be used. Furthermore, in the present invention, the light chain constant region may be a light chain constant region that has been modified by amino acid substitution, deletion, addition, and / or insertion.
- the heavy chain constant region of the antibody of the present invention for example, the heavy chain constant region of a human IgG antibody can be used, and preferably the heavy chain constant region of a human IgG1 antibody or human IgG4 antibody.
- polypeptide of the present invention can be combined with other proteins, bioactive peptides and the like to form Fc fusion protein molecules.
- proteins and bioactive peptides include, but are not limited to, receptors, adhesion molecules, ligands, and enzymes.
- Fc fusion protein molecule of the present invention include a protein in which an Fc domain is fused to a receptor protein that binds to a target.
- a protein in which an Fc domain is fused to a receptor protein that binds to a target For example, TNFR-Fc fusion protein, IL1R-Fc fusion protein, VEGFR-Fc fusion protein, CTLA4 -Fc fusion proteins and the like (Nat Med. 2003 Jan; 9 (1): 47-52, BioDrugs. 2006; 20 (3): 151-60.).
- the protein to be fused to the polypeptide of the present invention may be any molecule as long as it binds to the target molecule.
- scFv molecule WO2005 / 037989
- single domain antibody molecule WO2004 / 058821, WO2003 / 002609
- antibody -Like molecule a multispecific antibody that binds to multiple types of target molecules or epitopes.
- DARPins WO2002 / 020565
- Affibody WO1995 / 001937
- Avimer WO2004 / 044011, WO2005 / 040229
- Adnectin WO2002 / 032925
- the antibody and Fc fusion protein molecule may also be a multispecific antibody that binds to multiple types of target molecules or epitopes.
- the antibodies of the present invention also include modified antibodies.
- modified antibody include antibodies bound to various molecules such as polyethylene glycol (PEG) and cytotoxic substances.
- PEG polyethylene glycol
- Such a modified antibody can be obtained by chemically modifying the antibody of the present invention. Methods for modifying antibodies have already been established in this field.
- the antibody of the present invention may be a bispecific antibody.
- Bispecific antibody refers to an antibody having variable regions that recognize different epitopes in the same antibody molecule, but the epitope may exist in different molecules or in the same molecule. It may be.
- polypeptide of the present invention can be produced by methods known to those skilled in the art.
- the antibody can be prepared by the following method, but is not limited thereto.
- DNA encoding the heavy chain of an antibody the DNA encoding the heavy chain in which one or more amino acid residues in the Fc region are substituted with other amino acids of interest, and the DNA encoding the light chain of the antibody
- DNA encoding a heavy chain in which one or more amino acid residues in the Fc region are substituted with other amino acids of interest for example, obtain the Fc region portion of the DNA encoding the natural heavy chain, It can be obtained by appropriately introducing substitutions so that a codon encoding a specific amino acid in the region encodes another amino acid of interest.
- DNA encoding a protein in which one or more amino acid residues in the Fc region of the natural heavy chain are substituted with other amino acids of interest By designing a DNA encoding a protein in which one or more amino acid residues in the Fc region of the natural heavy chain are substituted with other amino acids of interest, and chemically synthesizing the DNA, It is also possible to obtain DNA encoding a heavy chain in which one or more amino acid residues in the Fc region are substituted with other amino acids of interest.
- the amino acid substitution site and the type of substitution are not particularly limited. Moreover, it is not restricted to substitution, Any of deletion, addition, insertion, or those combinations may be sufficient.
- DNA encoding a heavy chain in which one or more amino acid residues in the Fc region are substituted with other amino acids of interest can be produced by dividing into partial DNAs.
- Examples of combinations of partial DNAs include DNA encoding a variable region and DNA encoding a constant region, or DNA encoding a Fab region and DNA encoding an Fc region, but are not limited to these combinations. is not.
- the DNA encoding the light chain can also be produced by dividing it into partial DNAs.
- DNA encoding a heavy chain variable region is incorporated into an expression vector together with DNA encoding a heavy chain constant region to construct a heavy chain expression vector.
- DNA encoding a light chain variable region is incorporated into an expression vector together with DNA encoding a light chain constant region to construct a light chain expression vector.
- the DNA encoding the target antibody When the DNA encoding the target antibody is incorporated into an expression vector, it is incorporated into the expression vector so that it is expressed under the control of an expression control region such as an enhancer or promoter. Next, host cells are transformed with this expression vector to express the antibody. In that case, a combination of an appropriate host and an expression vector can be used.
- vectors examples include M13 vectors, pUC vectors, pBR322, pBluescript, and pCR-Script.
- pGEM-T pDIRECT, pT7 and the like can be used in addition to the above vector.
- an expression vector is particularly useful.
- an expression vector for example, when the host is E. coli such as JM109, DH5 ⁇ , HB101, XL1-Blue, a promoter that can be efficiently expressed in E. coli, such as the lacZ promoter (Ward et al., Nature (1989) 341). , 544-546; FASEB J. (1992) 6, 2422-2427, incorporated herein by reference in its entirety, araB promoter (Better et al., Science (1988) 240, 1041-1043, in its entirety by reference) Are incorporated herein), or have a T7 promoter or the like.
- such vectors include pGEX-5X-1 (Pharmacia), “QIAexpress® system” (QIAGEN), pEGFP, or pET (in this case, the host expresses T7 RNA polymerase).
- pGEX-5X-1 Pulacia
- QIAexpress® system QIAGEN
- pEGFP pEGFP
- pET in this case, the host expresses T7 RNA polymerase.
- BL21 is preferred).
- the vector may also contain a signal sequence for polypeptide secretion.
- the signal sequence for polypeptide secretion is the pelB signal sequence (Lei, S. P. et al J. Bacteriol. (1987) 169, 4397, which is incorporated herein by reference in its entirety when produced in the periplasm of E. coli. Built in).
- Introduction of a vector into a host cell can be performed using, for example, the lipofectin method, the calcium phosphate method, or the DEAE-Dextran method.
- vectors for producing the polypeptide of the present invention include mammalian-derived expression vectors (for example, pcDNA3 (manufactured by Invitrogen), pEGF-BOS® (Nucleic® Acids.® Res.
- pEF Bacillus subtilis-derived expression vectors
- pCDM8 Bacillus subtilis-derived expression vectors
- insect cell-derived expression vectors eg, “Bac-to-BACBAbaculovairus expression system” (GIBCO BRL), pBacPAK8
- plant-derived expression vectors eg, pMH1, pMH2
- animal virus-derived expression vectors eg, pHSV, pMV, pAdexLcw
- retrovirus-derived expression vectors eg, pZIPneo
- yeast-derived expression vectors eg, “Pichia® Expression® Kit” (manufactured by Invitrogen), pNV11, SP-Q01
- Bacillus subtilis-derived expression vectors for example, pPL608, pKTH50.
- promoters required for expression in cells such as the SV40 promoter (Mulligan et al., Nature (1979) 277, 108, see MMTV-LTR promoter, EF1 ⁇ promoter (Mizushima et al., Nucleic Acids Res. (1990) 18, 5322, which is hereby incorporated by reference in its entirety), CAG promoter ( Gene. (1991) 108, 193, which is incorporated herein by reference in its entirety, is essential to have a CMV promoter, etc., and a gene (eg, drug (neomycin) for selecting transformed cells. And drug resistance genes that can be discriminated by G418, etc.).
- Examples of such a vector include pMAM, pDR2, pBK-RSV, pBK-CMV, pOPRSV, and pOP13.
- a vector having a DHFR gene complementary to the CHO cell lacking the nucleic acid synthesis pathway for example, , PCHOI, etc.
- amplifying with methotrexate (MTX) for example, COS with a gene expressing SV40 T antigen on the chromosome
- COS with a gene expressing SV40 T antigen on the chromosome An example is a method of transforming with a vector (such as pcD) having an SV40 replication origin using cells.
- a vector such as pcD
- the replication origin those derived from polyoma virus, adenovirus, bovine papilloma virus (BPV) and the like can also be used.
- the expression vectors are selectable markers: aminoglycoside transferase (APH) gene, thymidine kinase (TK) gene, E. coli xanthine guanine phosphoribosyltransferase (Ecogpt) gene, dihydrofolate reductase ( dhfr) gene and the like.
- APH aminoglycoside transferase
- TK thymidine kinase
- Ecogpt E. coli xanthine guanine phosphoribosyltransferase
- dhfr dihydrofolate reductase
- Antibody recovery can be performed, for example, by culturing transformed cells and then separating them from the inside of the cell or the culture solution of molecularly transformed cells.
- methods such as centrifugation, ammonium sulfate fractionation, salting out, ultrafiltration, 1q, FcRn, protein A, protein G column, affinity chromatography, ion exchange chromatography, and gel filtration chromatography are used. It can carry out in combination as appropriate.
- the present invention relates to a polypeptide comprising an antibody Fc region, wherein the binding activity to Fc ⁇ RIIa is maintained or reduced as compared to the parent polypeptide, comprising adding at least one amino acid modification to the Fc region, and binding to Fc ⁇ RIIb Methods of producing polypeptides with enhanced activity are provided.
- a production method including the following steps can be mentioned; (A) in a polypeptide comprising an antibody Fc region, the step of adding at least one amino acid modification to the Fc region; (B) measuring the binding activity to Fc ⁇ RIIa and the binding activity to Fc ⁇ RIIb of the polypeptide modified in the step (a), and (c) maintaining or decreasing the binding activity to Fc ⁇ RIIa as compared with the parent polypeptide. And a polypeptide having enhanced binding activity to Fc ⁇ RIIb.
- a preferred embodiment is a method for producing a polypeptide comprising an antibody Fc region, (A) modifying the nucleic acid encoding the polypeptide so that the binding activity to Fc ⁇ RIIa is maintained or decreased and the binding activity to Fc ⁇ RIIb is enhanced compared to the parent polypeptide; (B) introducing the nucleic acid into a host cell and culturing it so as to express it, (C) recovering the polypeptide from the host cell culture.
- antibodies and Fc fusion protein molecules produced by the production method are also included in the present invention.
- the present invention also relates to a polypeptide comprising an antibody Fc region, which comprises adding at least one amino acid modification to the Fc region, and when administered to a living body, the antibody against the polypeptide compared to the parent polypeptide
- a method for producing a polypeptide in which the production of is suppressed For example, a production method including the following steps can be mentioned; (A) a polypeptide comprising an antibody Fc region, wherein at least one amino acid modification is applied to the Fc region; and (b) when the polypeptide modified in the step (a) is administered to a living body, A step of confirming that production of an antibody is suppressed as compared with a polypeptide.
- Whether the production of antibodies against the polypeptide has been suppressed can be confirmed by a method such as actually administering the polypeptide to an animal.
- the binding activity to Fc ⁇ RIIa and the binding activity to Fc ⁇ RIIb are measured, and it can be determined that the production of the antibody is suppressed by increasing the value obtained by dividing the KD value for Fc ⁇ RIIa by the KD value for Fc ⁇ RIIb.
- Such a polypeptide is thought to be useful as a pharmaceutical because it can suppress the production of antibodies without activating activated Fc ⁇ R.
- the polypeptide is modified such that Pro at EU numbering 238 is replaced with Asp or Leu at EU numbering 328 is replaced with Glu. To do.
- EU numbering 237th Gly substitution with Trp in addition to substitution of 238th Pro with Asp at EU numbering 238, EU numbering 237th Gly substitution with Trp, EU numbering 237th Gly substitution with Phe, EU numbering 267 Substitution of Ser for Val, EU numbering 267, Ser for Gln, EU numbering, 268th His for Asn, EU numbering, 271th Pro for Gly, EU numbering, 326th Lys to Leu, EU numbering 326 Lys to Gln, EU numbering 326 Lys to Glu, EU numbering 326 Lys to Met, EU numbering 239th Ser Substitution of Asp, EU numbering 267, Ser to Ala, EU numbering, 234, Leu to Trp, EU numbering, 234, Leu to Tyr, EU numbering, 237, Gly to Ala Replacement, EU numbering 237th Gly Asp Substitution, EU numbering 237th Gly substitution to Glu, EU numbering 237th Gly substitution to Leu, EU numbering 2
- the present invention provides a method for modifying a polypeptide to produce a polypeptide that maintains or decreases the binding activity to Fc ⁇ RIIa and has an enhanced binding activity to Fc ⁇ RIIb compared to the parent polypeptide.
- the present invention also provides a method for modifying a polypeptide to produce a polypeptide in which the production of an antibody is suppressed compared to a parent polypeptide when administered to a living body.
- the polypeptide is modified so that Pro at EU numbering 238th is replaced with Asp or Leu at EU numbering 328 is replaced with Glu.
- EU numbering 237th Gly substitution with Trp in addition to substitution of 238th Pro with Asp at EU numbering 238, EU numbering 237th Gly substitution with Trp, EU numbering 237th Gly substitution with Phe, EU numbering 267 Substitution of Ser for Val, EU numbering 267, Ser for Gln, EU numbering, 268th His for Asn, EU numbering, 271th Pro for Gly, EU numbering, 326th Lys to Leu, EU numbering 326 Lys to Gln, EU numbering 326 Lys to Glu, EU numbering 326 Lys to Met, EU numbering 239th Ser Substitution of Asp, EU numbering 267, Ser to Ala, EU numbering, 234, Leu to Trp, EU numbering, 234, Leu to Tyr, EU numbering, 237, Gly to Ala Replacement, EU numbering 237th Gly Asp Substitution, EU numbering 237th Gly substitution to Glu, EU numbering 237th Gly substitution to Leu, EU numbering 2
- the present invention is a polypeptide comprising an antibody Fc region, wherein at least one amino acid is modified, the binding activity to Fc ⁇ RIIa is maintained or decreased, and the binding activity to Fc ⁇ RIIb is enhanced compared to the parent polypeptide.
- Nucleic acids encoding the polypeptides are provided.
- the nucleic acid of the present invention may be in any form such as DNA or RNA.
- the present invention provides a vector containing the nucleic acid of the present invention.
- the type of vector can be appropriately selected by those skilled in the art depending on the host cell into which the vector is introduced. For example, the above-described vectors can be used.
- the present invention relates to a host cell transformed with the vector of the present invention.
- the host cell can be appropriately selected by those skilled in the art.
- the above-described host cell can be used.
- the present invention relates to a polypeptide comprising an antibody Fc region, wherein the binding activity to Fc ⁇ RIIa is maintained or decreased as compared to the parent polypeptide, comprising adding at least one amino acid modification to the Fc region, and against Fc ⁇ RIIb.
- a method for enhancing binding activity is provided.
- the present invention also relates to a polypeptide comprising an antibody Fc region, which comprises adding at least one amino acid modification to the Fc region, and when administered to a living body, the antibody against the polypeptide compared to the parent polypeptide A method for inhibiting the production of
- the polypeptide in a polypeptide containing the Fc region of human IgG, is modified so that Pro at EU numbering 238th is replaced with Asp or Leu at EU numbering 328 is replaced with Glu.
- EU numbering 237th Gly substitution with Trp in addition to substitution of 238th Pro with Asp at EU numbering 238, EU numbering 237th Gly substitution with Trp, EU numbering 237th Gly substitution with Phe, EU numbering 267 Substitution of Ser for Val, EU numbering 267, Ser for Gln, EU numbering, 268th His for Asn, EU numbering, 271th Pro for Gly, EU numbering, 326th Lys to Leu, EU numbering 326 Lys to Gln, EU numbering 326 Lys to Glu, EU numbering 326 Lys to Met, EU numbering 239th Ser Substitution of Asp, EU numbering 267, Ser to Ala, EU numbering, 234, Leu to Trp, EU numbering, 234, Leu to Tyr, EU
- the present invention provides a pharmaceutical composition containing the polypeptide of the present invention.
- the pharmaceutical composition of the present invention can be formulated by a known method by introducing a pharmaceutically acceptable carrier in addition to the antibody or Fc fusion protein molecule of the present invention.
- a pharmaceutically acceptable carrier for example, it can be used parenterally in the form of a sterile solution with water or other pharmaceutically acceptable liquid, or an injection of suspension.
- a pharmacologically acceptable carrier or medium specifically, sterile water, physiological saline, vegetable oil, emulsifier, suspension, surfactant, stabilizer, flavoring agent, excipient, vehicle, preservative It is conceivable to formulate by combining with a binder or the like as appropriate and mixing in a unit dosage form generally required for pharmaceutical practice.
- Aqueous solutions for injection include, for example, isotonic solutions containing physiological saline, glucose and other adjuvants such as D-sorbitol, D-mannose, D-mannitol and sodium chloride, and suitable solubilizers such as You may use together with alcohol, specifically ethanol, polyalcohol, for example, propylene glycol, polyethylene glycol, nonionic surfactant, for example, polysorbate 80 (TM), HCO-50.
- isotonic solutions containing physiological saline glucose and other adjuvants such as D-sorbitol, D-mannose, D-mannitol and sodium chloride, and suitable solubilizers such as You may use together with alcohol, specifically ethanol, polyalcohol, for example, propylene glycol, polyethylene glycol, nonionic surfactant, for example, polysorbate 80 (TM), HCO-50.
- alcohol specifically ethanol, polyalcohol, for example, propylene glycol, polyethylene glycol, nonionic surfactant
- oily liquid examples include sesame oil and soybean oil, which may be used in combination with benzyl benzoate or benzyl alcohol as a solubilizing agent.
- oily liquid examples include sesame oil and soybean oil, which may be used in combination with benzyl benzoate or benzyl alcohol as a solubilizing agent.
- buffer for example, phosphate buffer, sodium acetate buffer, a soothing agent, for example, procaine hydrochloride, stabilizer, for example, benzyl alcohol, phenol, antioxidant.
- the prepared injection solution is usually filled into a suitable ampoule.
- Administration is preferably parenteral administration, and specific examples include injection, nasal administration, pulmonary administration, and transdermal administration.
- the injection dosage form can be administered systemically or locally by, for example, intravenous injection, intramuscular injection, intraperitoneal injection, subcutaneous injection and the like.
- the administration method of the pharmaceutical composition of the present invention can be appropriately selected depending on the age and symptoms of the patient.
- the dose of the pharmaceutical composition containing the antibody or the polynucleotide encoding the antibody can be selected, for example, in the range of 0.0001 mg to 1000 mg per kg body weight. Alternatively, for example, the dose can be selected in the range of 0.001 to 100,000 mg / body per patient, but is not necessarily limited to these values.
- the dose and administration method vary depending on the weight, age, symptoms, etc. of the patient, but can be appropriately selected by those skilled in the art.
- the polypeptide of the present invention is useful as an active ingredient of a drug that suppresses the activation of B cells, mast cells, dendritic cells and / or basophils.
- the polypeptide of the present invention can selectively act on Fc ⁇ RIIb without activating activated Fc ⁇ R, thereby suppressing activation of B cells, mast cells, dendritic cells and / or basophils It is.
- Activation of B cells includes proliferation, IgE production, IgM production, IgA production and the like.
- the polypeptide of the present invention suppresses IgE production of B cells by crosslinking Fc ⁇ RIIb and IgE, suppresses IgM production of B cells by crosslinking with IgM, and suppresses IgA production by crosslinking with IgA To do.
- molecules expressed on B cells such as BCR, CD19, CD79b, etc. that contain ITAM domain in the cell or that interact with ITAM domain directly or indirectly crosslink Fc ⁇ RIIb.
- the activation of mast cells includes proliferation, activation by IgE, degranulation and the like.
- the polypeptide of the present invention described above directly binds Fc ⁇ RIIb with a molecule containing an ITAM domain expressed on mast cells such as IgE receptors Fc ⁇ RI, DAP12, CD200R3 or the like and interacting with the ITAM domain. It is possible to suppress proliferation, activation by IgE, etc. and suppression of degranulation by cross-linking indirectly or indirectly.
- the activation of basophil includes proliferation, degranulation and the like.
- the above-mentioned polypeptide of the present invention can be activated also in basophils by directly or indirectly cross-linking Fc ⁇ RIIb and a molecule on the cell membrane containing an ITAM domain in the cell or interacting with the ITAM domain.
- the activation of dendritic cells includes proliferation, degranulation and the like.
- the above-described polypeptide of the present invention is also active in dendritic cells by directly or indirectly cross-linking Fc ⁇ RIIb with a molecule that contains an ITAM domain in the cell or interacts with the ITAM domain. , Degranulation and proliferation can be suppressed.
- the polypeptide of the present invention is useful as an active ingredient of a therapeutic or prophylactic agent for immunoinflammatory diseases.
- the polypeptide of the present invention can suppress the activation of B cells, mast cells, dendritic cells and / or basophils, and as a result, the polypeptide of the present invention is administered.
- it is possible to treat or prevent immunoinflammatory diseases.
- Immunoinflammatory disease includes, but is not limited to: rheumatoid arthritis, autoimmune hepatitis, autoimmune thyroiditis, autoimmune blistering, autoimmune corticosteroids , Autoimmune hemolytic anemia, autoimmune thrombocytopenic purpura, megacytic anemia, autoimmune atrophic gastritis, autoimmune neutropenia, autoimmune orchitis, autoimmune encephalomyelitis , Autoimmune receptor disease, autoimmune infertility, chronic active hepatitis, glomerulonephritis, interstitial pulmonary fibrosis, multiple sclerosis, Paget's disease, osteoporosis, multiple myeloma, uveitis, acute And chronic spondylitis, gouty arthritis, inflammatory bowel disease, adult respiratory distress syndrome (ARDS), psoriasis, Crohn's disease, Graves' disease, juvenile diabetes, Addison's disease, myasthenia grav
- the polypeptide of the present invention suppresses the production of autoantibodies and treats or prevents the autoimmune diseases in autoimmune diseases in which production of antibodies against autoantigens (autoantibodies) is considered to be the cause of the diseases. It is useful as an active ingredient of drugs. It has been reported that by using a molecule that fuses AchR, an autoantigen of myasthenia gravis, with the Fc part of an antibody, it suppresses the proliferation of B cells expressing BCR that recognizes AchR and induces apoptosis. (J Neuroimmunol, 227, 35-43, 2010).
- the BCR of the B cell that expresses the BCR against the self antigen and Fc ⁇ RIIb are cross-linked to express the BCR against the self antigen. It is possible to suppress the proliferation of B cells and induce apoptosis.
- Such autoimmune diseases include Guillain-Barre syndrome, myasthenia gravis, chronic atrophic gastritis, autoimmune hepatitis, primary biliary cirrhosis, primary sclerosing cholangitis, autoimmune pancreatitis, aortitis syndrome , Goodpasture syndrome, rapid progressive glomerulonephritis, giant erythroblastic anemia, autoimmune hemolytic anemia, autoimmune neutropenia, idiopathic thrombocytopenic purpura, Graves' disease, Hashimoto's disease, primary Hypothyroidism, idiopathic Addison's disease, insulin-dependent diabetes mellitus, chronic discoid lupus erythematosus, localized scleroderma, pemphigus, pemphigoid, gestational herpes zoster, linear IgA bullous dermatosis, acquired epidermis Includes bullous disease, alopecia areata,
- the polypeptide of the present invention is useful as an active ingredient of a therapeutic agent for a disease lacking a protein necessary for a living body.
- a treatment method is used in which the protein is administered and supplemented as a drug, but since the patient originally lacks the protein, the protein supplemented from the outside is It is recognized as a foreign substance and an antibody against the protein is produced. As a result, the protein is easily removed, and the effect as a drug is diminished.
- a fusion protein of such a protein and the antibody Fc region described in the present invention it is possible to crosslink BCR and Fc ⁇ RIIb on B cells recognizing the protein and to suppress antibody production against the protein. It is.
- Proteins to be supplemented include Factor VIII, Factor IX, TPO, EPO, ⁇ -iduronidase, iduronate sulfatase, A type heparan N-sulfatase, B type ⁇ -N-acetylglucosaminidase, C type acetyl CoA: ⁇ -glucosaminidase acetyltransferase, D type N -acetylglucosamine 6-sulfatase, galactose 6-sulfatase, N-acetylgalactosamine 4-sulfatase, ⁇ -glucuronidase, ⁇ -galactosidase, acidic ⁇ -galactosidase, glucocerebrosidase.
- the polypeptide of the present invention is useful as an active ingredient of an antiviral agent.
- An antibody against a virus and containing an Fc region according to the present invention is capable of suppressing antibody-dependent infection enhancement that is found in an antibody against a virus.
- Antibody-dependent infection enhancement is a phenomenon in which a virus is phagocytosed via an active Fc ⁇ R using a neutralizing antibody against the virus and infects Fc ⁇ R-expressing cells, thereby spreading the infection. It has been reported that the binding of neutralizing antibodies to dengue virus to Fc ⁇ RIIb plays an important role in suppressing the enhancement of antibody-dependent infection (Proc Natl Acad Sci USA, 108, 12479-12484, 2011).
- Viruses include dengue viruses (DENV1, DENV2, DENV4) and HIV. However, it is not limited only to these.
- polypeptide of the present invention is useful as an active ingredient of a prophylactic or therapeutic agent for arteriosclerosis.
- An antibody against oxidized LDL that causes arteriosclerosis and comprising an Fc region according to the present invention can prevent Fc ⁇ RIIa-dependent inflammatory cell adhesion.
- Antioxidant LDL antibody inhibits the interaction between oxidized LDL and CD36.
- Antioxidant LDL antibody binds to endothelial cells, and the Fc part is recognized by Fc ⁇ RIIa or Fc ⁇ RI dependently and adheres to it. Reported (Immunol Lett, 108, 52-61, 2007).
- an antibody containing the Fc region described in the present invention for such an antibody, it is considered that Fc ⁇ RIIa-dependent binding is inhibited and that monosite adhesion is suppressed by a suppression signal via Fc ⁇ RIIb. .
- the polypeptide of the present invention is useful as an active ingredient of a therapeutic or preventive agent for cancer.
- a therapeutic or preventive agent for cancer As described above, it is known that by enhancing the binding to Fc ⁇ RIIb, the agonist activity of the agonist antibody is enhanced, and the antitumor effect of the antibody is also enhanced.
- the agonist antibody used is useful for the treatment or prevention of cancer.
- Fc regions described in the present invention are Aliases, CD120a, CD120b, Lymphotoxin ⁇ receptor, CD134, CD40, FAS, TNFRSF6B, CD27, CD30, CD137, TNFRSF10A, TNFRSF10B, TNFRSF10C, TNFRSF10D, RANK, Osteorotegerin, TNFRSFB, TNFRSFB12, TNFRSFB12 , TNFRSF14, Nerve growth factor receptor, TNFRSF17, TNFRSF18, TNFRSF19, TNFRSF21, TNFRSF25, Ectodysplasin A2 receptor, etc. It also enhances the agonist activity of agonist antibodies other than those described above.
- Cancers include, but are not limited to: lung cancer (including small cell lung cancer, non-small cell lung cancer, lung adenocarcinoma and lung squamous cell carcinoma), colon cancer, rectal cancer, colon cancer Breast cancer, liver cancer, stomach cancer, pancreatic cancer, renal cancer, prostate cancer, ovarian cancer, thyroid cancer, bile duct cancer, peritoneal cancer, mesothelioma, squamous cell carcinoma, cervical cancer, endometrial cancer, bladder cancer, esophageal cancer, head Cervical cancer, nasopharyngeal cancer, salivary gland tumor, thymoma, skin cancer, basal cell tumor, malignant melanoma, anal cancer, penile cancer, testicular cancer, Wilms tumor, acute myeloid leukemia (acute myelocytic leukemia, acute myeloblast Sphere leukemia, acute promyelocytic leukemia, acute myelomonocytic leukemia and acute monoc
- the present invention also relates to a method for treating or preventing an immunoinflammatory disease, comprising the step of administering to the subject (patient) the polypeptide of the present invention or the polypeptide produced by the production method of the present invention.
- the present invention also provides a kit for use in the therapeutic or prophylactic method of the present invention, comprising at least the polypeptide of the present invention or the polypeptide produced by the production method of the present invention, or the pharmaceutical composition of the present invention. .
- the kit may be packaged with a pharmaceutically acceptable carrier, a medium, instructions describing the method of use, and the like.
- the present invention also relates to the use of the polypeptide of the present invention or the polypeptide produced by the production method of the present invention in the manufacture of a therapeutic or prophylactic agent for immunoinflammatory diseases.
- the present invention also relates to the polypeptide of the present invention or the polypeptide produced by the production method of the present invention for use in the therapeutic or prophylactic method of the present invention.
- Example 1 Comprehensive analysis of binding of Fc variant to Fc ⁇ R Compared with IgG1, Fc-mediated binding to active Fc ⁇ R, particularly Fc ⁇ RIIa gene polymorphisms of H type and R type. In order to produce an antibody with reduced and enhanced binding to Fc ⁇ RIIb, mutations were introduced into the IgG1 antibody, and comprehensive analysis of binding to each Fc ⁇ R was performed.
- variable region (SEQ ID NO: 15) of the anti-glypican 3 antibody which is an anti-glypican 3 antibody with an improved GpH7 CDR, disclosed in WO2009 / 041062 was used.
- GpL16-k0 (SEQ ID NO: 16) of glypican 3 antibody with improved plasma kinetics disclosed in WO2009 / 041062 was commonly used as the antibody L chain.
- B3 (SEQ ID NO: 17) obtained by introducing a mutation of K439E into G1d from which Gly and Lys at the C-terminus of IgG1 were removed was used as the antibody H chain constant region.
- This H chain is referred to as GpH7-B3 (SEQ ID NO: 18), and the L chain is referred to as GpL16-k0 (SEQ ID NO: 16).
- B3 variants For GpH7-B3, amino acids considered to be involved in Fc ⁇ R binding and the surrounding amino acids (EU numbering from 234 to 239, 265 to 271, 295, 296, 298, 300, 324 To 337) were replaced with the original amino acid and 18 amino acids excluding Cys. These Fc variants are called B3 variants. B3 variants were expressed and purified by the method of Reference Example 1, and the binding to each Fc ⁇ R (Fc ⁇ RIa, Fc ⁇ RIIa H type, Fc ⁇ RIIa R type, Fc ⁇ RIIb, Fc ⁇ RIIIa) was comprehensively evaluated by the method of Reference Example 2. About the interaction analysis result with each Fc ⁇ R, a diagram was prepared according to the following method.
- the amount of binding to the Fc ⁇ R of the antibody derived from each B3 variant is the antibody to be compared without introducing a mutation in B3 (EU numbering from 234 to 239, 265 to 271, 295, 296 , 298th, 300th, 324th to 337th were divided by the value of the binding amount to Fc ⁇ R of the antibody having the human IgG1 sequence. A value obtained by further multiplying the value by 100 was used as an indicator of the relative binding activity of each mutant to Fc ⁇ R.
- the horizontal axis represents the relative binding activity value of each mutant to Fc ⁇ RIIb
- the vertical axis represents the relative binding activity value of each mutant to Fc ⁇ RIa, Fc ⁇ RIIa H type, Fc ⁇ RIIa R type, and Fc ⁇ RIIIa. Displayed (FIGS. 1, 2, 3, 4).
- mutation mutated A modification that replaces the 238th Pro with Asp in EU numbering
- mutation mutated B EU numbering 328th Leu
- Example 2 SPR analysis of Fc ⁇ RIIb selective binding variants The binding of each of the EU numbering 238th Pro found in Example 1 to Asp was analyzed in more detail.
- variable region (SEQ ID NO: 19) of the antibody against the human interleukin 6 receptor disclosed in WO2009 / 125825 as the antibody heavy chain variable region is used as the variable region of human IgG1 (SEQ ID NO: 19).
- IL6R-G1d (SEQ ID NO: 20) having G1d from which terminal Gly and Lys were removed was used as the H chain of IgG1.
- IL6R-G1d-v1 (SEQ ID NO: 21) was prepared by substituting Asp for the 238th Pro of EU numbering IL6R-G1d.
- IL6R-G1d-v2 (SEQ ID NO: 23) was prepared by substituting Glu for Leu at the EU numbering 328th of IL6R-G1d. Further, for comparison, IL6R-G1d-v3 (SEQ ID NO :) in which EU numbering 267th Ser of IL6R-G1d described in Non-Patent Document 27 is substituted with Glu, and Leu of EU numbering 328th is substituted with Phe. 24) was produced.
- IL6R-L (SEQ ID NO: 22), which is the L chain of tocilizumab, was commonly used as the antibody L chain, and the antibody was expressed and purified with each H chain according to the method of Reference Example 1.
- Antibodies having amino acid sequences derived from IL6R-G1d, IL6R-G1d-v1, IL6R-G1d-v2, IL6R-G1d-v3 as the obtained antibody H chains are IgG1, IgG1-v1, IgG1-v2, Called IgG1-v3.
- KD was calculated using the following 1: 1 binding model formula described in Biacore T100 Software Handbook BR1006-48 Edition AE.
- the behavior of molecules interacting in the 1: 1 binding model on Biacore can be expressed by the following equation 1.
- Equation 2 Equation 2
- R max represents the value of R max obtained by global fitting with a 1: 1 Langmuir binding model to the sensorgram obtained as a result of IgG1 interaction analysis for each Fc ⁇ R as the capture amount of IgG1. The value obtained by multiplying by the capture amount of IgG1-v1 and IgG1-v2.
- R max at the time of measurement is the antibody that is bound on the chip at the time of measurement. It is a calculation based on the assumption that it is proportional to the amount of.
- R eq was the amount of each Fc ⁇ R binding to each variant on the sensor chip observed at the time of measurement.
- Capture amounts of IgG1, IgG1-v1, and IgG1-v2 when analyzing the interaction with Fc ⁇ RIIa type H are 452, 469.2, and 444.2 RU.
- Capture amounts of IgG1, IgG1-v1, and IgG1-v2 when analyzing the interaction with Fc ⁇ RIIIa Were 454.5, 470.8, 447.1 RU.
- the R max obtained when global fitting was performed with the 1: 1 Langmuir binding model on the sensorgram obtained as a result of the interaction analysis of IgG1 with Fc ⁇ RIIa H type and Fc ⁇ RIIIa was 69.8 and 63.8 RU, respectively. .
- R max of each for the R max of IgG1-v1, IgG1-v2 Fc ⁇ RIIa H type 72.5,68.6 RU, IgG1-v1 for Fc ⁇ RIIIa, IgG1-v2 was calculated to be respectively 66.0,62.7 RU .
- the KD values for IgG1, IgG1-v1, IgG1-v2, and IgG1-v3 Fc ⁇ R are shown in Table 1 (KD values for each Fc ⁇ R of each antibody), and the KD values for each Fc ⁇ R of IgG1 are IgG1-v1, IgG1-v2
- the relative KD values of IgG1-v1, IgG1-v2, and IgG1-v3 divided by the KD value for each Fc ⁇ R of IgG1-v3 are shown in Table 2 (relative KD values for each Fc ⁇ R of each antibody).
- IgG1-v1 has a binding activity reduced to 0.047 times for Fc ⁇ RIa, decreased to 0.10 times for Fc ⁇ R ⁇ IIa R type, and binding activity to Fc ⁇ RIIa H type 0.014.
- the binding activity for Fc ⁇ RIIIa was reduced by a factor of 0.061.
- the binding activity for Fc ⁇ RIIb was improved by 4.8 times.
- IgG1-v2 has a 0.74 fold decrease in binding activity to Fc ⁇ RIa compared to IgG1, a 0.41 fold decrease in Fc ⁇ R IIa R type, and a binding activity to Fc ⁇ RIIa H type. It decreased 0.064 times and the binding activity to Fc ⁇ RIIIa was reduced 0.14 times. On the other hand, the binding activity for Fc ⁇ RIIb was improved 2.3 times.
- IgG1-v1 having a modification in which EU numbering 238th Pro is replaced with Asp and IgG1-v2 having a modification in which EU numbering 328th Leu is replaced with Glu are both polymorphic of Fc ⁇ RIIa. It was clarified that it has the property of increasing the binding to the inhibitory Fc ⁇ R, Fc ⁇ RIIb, while attenuating the binding to all active Fc ⁇ Rs.
- the selectivity of the obtained variant for Fc ⁇ RIIb was evaluated using the ratio of the binding activity to Fc ⁇ RIIb and the binding activity to Fc ⁇ RIIa R type or H type as an index.
- I / A (R) or I / A (H) which is a value obtained by dividing the KD value for Fc ⁇ RIIa R type or H type by the KD value for Fc ⁇ RIIb, is used as an index of selectivity of Fc ⁇ RIIb for each Fc ⁇ RIIa. It was.
- This index shows a larger value as the KD value for Fc ⁇ RIIb decreases or as the KD value for Fc ⁇ RIIa increases. That is, it is shown that the relative binding activity to Fc ⁇ RIIb compared to Fc ⁇ RIIa is improved in the variant showing a larger value.
- This index is summarized in Table 3 for each variant.
- IgG1-v3 to which the existing technology was applied compared to IgG1 showed a larger value than IgG1 for I / A (H) and was more selective for Fc ⁇ RIIb, but I / A (R) showed a smaller value than IgG1, and the selectivity for Fc ⁇ RIIb was improved.
- IgG1-v1 and IgG1-v2 found in this Example both show values greater than IgG1 for both I / A (R) and I / A (H), and the selectivity for Fc ⁇ RIIb is any of Fc ⁇ RIIa.
- IgG1-v3 described in Table 2 from Non-Patent Document 27 certainly increased the binding to Fc ⁇ RIIb by 408 times and the binding to Fc ⁇ RIIa H type decreased to 0.51 times, whereas Fc ⁇ RIIa R type Binding to 522 times.
- IgG1-v1 and IgG1-v2 suppress the binding to both Fc ⁇ RIIa R type and H type, and enhance the binding to Fc ⁇ RIIb, so that it is more selective for Fc ⁇ RIIb than IgG1-v3. It is considered a variant that binds. That is, the modification in which EU numbering 238th Pro is replaced with Asp and the EU numbering 328th Leu is replaced with Glu is extremely useful for the development of therapeutic agents for immunoinflammatory diseases and the like.
- Example 3 Effect of combination of selective binding modification of Fc ⁇ RIIb and amino acid substitution of other Fc region Substitution of 238th Pro of EU numbering 238 with improved selectivity for Fc ⁇ RIIb found in Example 1 and Example 2 We tried to further enhance the selectivity for Fc ⁇ RIIb based on the modified product.
- EU numbering that enhances the selectivity for Fc ⁇ RIIb described in Example 2 with respect to IL6R-G1d_v1 (SEQ ID NO: 21) in which IL6R-G1d is modified by substituting Pro at position 238 for EU numbering with Asp is used.
- a modified IL6R-G1d-v4 (SEQ ID NO: 25) into which the substitution of Glu for the second Leu was introduced was prepared according to the method of Reference Example 1 together with IL6R-L (SEQ ID NO: 22).
- An antibody having an amino acid sequence derived from IL6R-G1d-v4 as the obtained antibody H chain is designated as IgG1-v4.
- the binding activity of IgG1, IgG1-v1, IgG1-v2, and IgG1-v4 to Fc ⁇ RIIb was evaluated according to the method of Reference Example 2, and the results are shown in Table 4.
- IL6R-G1d-v1 SEQ ID NO: 21
- IL6R-G1d is modified by substituting Pro at position 238 of EU numbering to Asp.
- a modified IL6R-G1d-v5 SEQ ID NO: 26
- An antibody having an amino acid sequence derived from IL6R-G1d-v5 as the obtained antibody H chain is designated as IgG1-v5.
- the binding activity of IgG1, IgG1-v1, IgG1-v3, and IgG1-v5 to Fc ⁇ RIIb was evaluated according to the method of Reference Example 2, and the results are shown in Table 5.
- S267E / L328F, which had an effect of enhancing Fc ⁇ RIIb in Example 2 was introduced into the modified P238D, and the binding activity to Fc ⁇ RIIb before and after the introduction of the modification was evaluated. The results are shown in Table 5.
- Example 4 Comprehensive analysis of binding to Fc ⁇ RIIb of a modification in which modification of the hinge part is introduced in addition to modification of P238D As shown in Example 3, the 238th Pro of EU numbering against human natural IgG1 Even when Fc substituted with Asp was combined with other modifications predicted to further increase the binding to Fc ⁇ RIIb, the expected combination effect was not obtained. Therefore, based on the modified Fc in which the 238th Pro in the EU numbering was replaced with Asp, a study was carried out to find a variant that further enhances the binding to Fc ⁇ RIIb by comprehensively introducing modifications to that Fc. did.
- IL6R-G1d SEQ ID NO: 20
- IL6R-F11 in which a modification that replaces Met at EU position 252 with Tyr and a modification that replaces Asn at EU position 434 with Tyr is introduced
- SEQ ID NO: 27 SEQ ID NO: 27
- IL6R-F652 SEQ ID NO: 28
- the antibody H chain sequence in which the region near the EU numbering 238th residue was replaced with IL6R-F652 by 18 kinds of amino acids excluding the original amino acid and cysteine.
- Each of the expression plasmids was prepared.
- IL6R-L (SEQ ID NO: 22) was commonly used as the antibody L chain. These variants were expressed, purified and expressed by the method of Reference Example 1. These Fc variants are called PD variants. By the method of Reference Example 2, the interaction of each PD variant with Fc ⁇ RIIa R type and Fc ⁇ RIIb was comprehensively evaluated.
- a diagram was created according to the following method. Binding amount of each PD ⁇ variant binding to each Fc ⁇ R of the antibody (IL6R-F652 / IL6R-L, which is a modification obtained by substituting the 238th Pro in the EU numbering with Asp) using the value of the binding amount to each Fc ⁇ R as a control. The value obtained by dividing by 100 and further multiplied by 100 was taken as the value of the relative binding activity of each PD variant to each Fc ⁇ R.
- the horizontal axis shows the relative binding activity value of each PD variant to Fc ⁇ RIIb
- the vertical axis shows the relative binding activity value of each PD ⁇ ⁇ ⁇ ⁇ variant to Fc ⁇ RIIa R type (FIG. 6).
- Table 7 summarizes the results of measuring the KD values of the variants shown in Table 6 for Fc ⁇ RIa, Fc ⁇ RIIaR, Fc ⁇ RIIaH, Fc ⁇ RIIb, and Fc ⁇ RIIIaV by the method of Reference Example 2.
- the sequence number in the table represents the sequence number of the H chain of the evaluated variant, and the modification represents the modification introduced into IL6R-F11 (SEQ ID NO: 27).
- IL6R-G1d / IL6R-L used as a template for producing IL6R-F11 is shown as *.
- KD (IIaR) / KD (IIb) and KD (IIaH) / KD (IIb) in the table are the values obtained by dividing the KD value for Fc ⁇ RIIaR of each variant by the KD value for Fc ⁇ RIIb of each variant, The value obtained by dividing the KD value for each variant Fc ⁇ RIIaH by the KD value for each variant Fc ⁇ RIIb is shown.
- KD (IIb) of the parent polypeptide / KD (IIb) of the modified polypeptide refers to a value obtained by dividing the KD value for Fc ⁇ RIIb of the parent polypeptide by the KD value for Fc ⁇ RIIb of each variant.
- Table 7 shows the KD value of the stronger binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of each variant / the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the parent polypeptide.
- the parent polypeptide refers to a variant having IL6R-F11 (SEQ ID NO: 27) in the H chain.
- the ratio of the KD value of each variant to Fc ⁇ RIIaR / the ratio of the KD value of each variant to Fc ⁇ RIIb, and the KD value of each variant to Fc ⁇ RIIaH / the ratio of the KD value of each variant to Fc ⁇ RIIb are relative to the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH.
- any of Table 7 The variant also had better binding selectivity to Fc ⁇ RIIb than the parent polypeptide.
- the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the variant / the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the parent polypeptide is 1 or more when the variant has a binding activity against Fc ⁇ RIIaR and Fc ⁇ RIIaH This means that the stronger binding of the binding activities is equivalent to or less than the stronger binding of the parent polypeptides to Fc ⁇ RIIaR and Fc ⁇ RIIaH.
- Example 5 X-ray crystal structure analysis of complex of Fc containing P238D and Fc ⁇ RIIb extracellular region As shown in the previous Example 3, it improves the binding activity of Fc ⁇ RIIb to Fc containing P238D It is also clear that even if a modification that improves the selectivity to Fc ⁇ RIIb is introduced, the binding activity to Fc ⁇ RIIb is reduced, and this is due to the fact that the structure of the interaction interface between Fc and Fc ⁇ RIIb introduces P238D It was thought that it had changed.
- Fc (P238D) the three-dimensional structure of the complex of IgG1 Fc (hereinafter referred to as Fc (P238D)) with the mutation of P238D and the extracellular region of Fc ⁇ RIIb was clarified by X-ray crystal structure analysis, It was decided to compare the complex, conformation, and binding mode of IgG1 Fc (hereinafter Fc (WT)) and Fc ⁇ RIIb extracellular region.
- Fc (WT) / Fc ⁇ RIIIb extracellular region complex (Nature, 2000, 400, 267-273; J. Biol Chem.
- Fc ⁇ RIIa and Fc ⁇ RIIb the amino acid sequence in the extracellular region is Since 93% matches and has very high homology, the three-dimensional structure of the Fc (WT) / Fc ⁇ RIIb extracellular region complex is modeled from the crystal structure of the Fc (WT) / Fc ⁇ RIIa extracellular region complex Estimated by
- the three-dimensional structure of the Fc (P238D) / Fc ⁇ RIIb extracellular region complex was determined at a resolution of 2.6 mm by X-ray crystal structure analysis.
- the structure of the analysis result is shown in FIG.
- the Fc ⁇ RIIb extracellular region is sandwiched between two Fc CH2 domains, and the three-dimensional structure of the complex of Fc (WT) and Fc ⁇ RIIIa, Fc ⁇ RIIIb, and Fc ⁇ RIIa extracellular regions analyzed so far It is similar.
- the crystal structure of the Fc (P238D) / Fc ⁇ RIIb extracellular region complex and the model structure of the Fc (WT) / Fc ⁇ RIIb extracellular region complex are combined into the Fc ⁇ RIIb extracellular region and the Fc CH2 domain A.
- the degree of overlap between Fc CH2 domains B was not good, and it was revealed that there was a three-dimensional structural difference in this part.
- the distance between the Fc ⁇ RIIb extracellular region and the Fc CH2 domain B is 3.7.
- the difference in interatomic interaction between Fc ⁇ RIIb and Fc CH2 domain B was compared between Fc (WT) and Fc (P238D) by extracting and comparing the following atomic pairs. As shown in Table 8, the interatomic interaction between Fc CH2 domain B and Fc ⁇ RIIb does not match between Fc (P238D) and Fc (WT).
- Fc (P238D) and Fc (WT) the position of the amino acid residue at position 238 in the EU numbering, which is the position of mutagenesis, changes, and the loop structure in the vicinity that continues from the hinge region is Fc (P238D) and Fc (WT) Then, it can be seen that it has changed (FIG. 10).
- Fc (WT) the EU numbering 238th Pro is inside the protein and forms a hydrophobic core with the surrounding residues, but when this changes to a very hydrophilic Asp with a charge, Being in the hydrophobic core as it is is disadvantageous in terms of energy in terms of desolvation.
- Fc (P238D) expression purification Preparation of Fc containing the P238D modification was performed as follows. First, the gene number Fc (P238D) obtained by substituting Ser at the 220th EU numbering Cys of hIL6R-IgG1-v1 (SEQ ID NO: 21) and cloning the C terminal from Glu at the 236th EU numbering was used as a reference example. According to the method described in 1, an expression vector was prepared, expressed and purified. Note that the Cys at number 220 in EU numbering forms a disulfide bond with Cys of the L chain in normal IgG1, but when preparing only Fc, the L chain is not co-expressed, so unnecessary disulfide bond formation occurs. Replaced with Ser to avoid.
- Endo F1 (Protein Science 1996, 5, 2617-2622) 0.29 mg expressed and purified by Escherichia coli as a fusion protein with glutathione S-transferase was added to 2 mg of the Fc ⁇ RIIb extracellular region sample obtained for crystallization, and 0.1 M By leaving it at room temperature for 3 days under a buffer condition of Bis-Tris pH 6.5, it was cleaved leaving N-acetylglucosamine in which an N-type sugar chain was directly bound to Asn.
- the Fc ⁇ RIIb extracellular region sample that had been subjected to this sugar chain cleavage treatment was concentrated with a 5000 MWCO ultrafiltration membrane and equilibrated with 20 mM HEPS pH 7.5, 0.05 M NaCl (Superdex200 10/300).
- Fc (P238D) was added to the resulting sugar chain-cleaved Fc ⁇ RIIb extracellular region fraction so that the Fc ⁇ RIIb extracellular region was slightly in excess at a molar ratio, and after concentration through a 10,000 MWCO ultrafiltration membrane, 20 mM HEPS pH 7.5 And purified by gel filtration column chromatography (Superdex200 10/300) equilibrated with 0.05M NaCl to obtain a sample of Fc (P238D) / Fc ⁇ RIIb extracellular region complex.
- MATRIX Hydra II Plus One
- the sample was kept frozen by placing it in a nitrogen stream at -178 ° C. A total of 225 X-rays were rotated while the crystal was rotated by 0.8 ° using the CCD detector Quantum 270 (ADSC) equipped with a beam line. Diffraction images were collected. The program Xia2 (CCP4 Software Suite), XDS Package (Walfgang Kabsch) and Scala (CCP4 Software Suite) were used to determine the lattice constant from the obtained diffraction images, index the diffraction spots, and process the diffraction data. Finally, diffraction intensity data up to a resolution of 2.46 mm was obtained.
- the amino acid residue part of A chain 6-178 was extracted from the structure coordinates of PDB code: 2FCB, which is the crystal structure of the Fc ⁇ RIIb extracellular region, and used as a model for searching the Fc ⁇ RIIb extracellular region.
- the Fc CH3 domain, Fc ⁇ RIIb extracellular region, and Fc CH2 domain are determined in turn from the rotation function and translation function in the crystal lattice of each search model, and the Fc (P238D) / Fc ⁇ RIIb extracellular region complex.
- An initial model of crystal structure was obtained. The obtained initial model was refined with a rigid body that moves two Fc CH2 domains, two Fc CH3 domains, and the Fc ⁇ RIIb extracellular region.
- the reliability factor R value was 40.4%, and the Free R value was 41.9%. Furthermore, structure refinement using the program Refmac5 (CCP4 Software Suite), 2Fo-Fc calculated based on the structural factor Fc calculated from the experimentally determined structural factor Fo, the model, and the phase calculated from the model The model was refined with the program Coot (Paul Emsley) while looking at the electron density map with Fo-Fc as a coefficient, and the model was refined by repeating these. Finally, by incorporating water molecules into the model based on the electron density map with coefficients of 2Fo-Fc and Fo-Fc and performing refinement, 24291 diffraction intensity data with a resolution of 25-2.6 mm is finally obtained. The crystallographic reliability factor R value was 23.7% and the Free R value was 27.6% for the model that used 4846 non-hydrogen atoms.
- Example 6 Analysis of binding to Fc ⁇ R of Fc variant whose alteration site was determined based on crystal structure X-ray crystal structure analysis of complex of Fc (P238D) and Fc ⁇ RIIb extracellular region obtained in Example 5 Based on the results of the above, on the modified Fc in which the EU numbering 238th Pro is replaced with Asp, it is predicted to affect the interaction with Fc ⁇ RIIb (EU numbering 233rd, 240th, 241st, 263th , 265, 266, 267, 268, 271, 273, 295, 296, 298, 300, 323, 325, 326, 327, 328, 330, 332 A comprehensive modification was introduced into the residue (No. 334), and the binding to Fc ⁇ RIIb was further enhanced.
- IL6R-B3 (SEQ ID NO: 40) was prepared by introducing a modification in which IL number 439th Lys was replaced with Glu to IL6R-G1d (SEQ ID NO: 20) prepared in Example 2.
- IL6R-BF648 (SEQ ID NO: 41) in which a modification in which 238th Pro was replaced with Asp was introduced by IL numbering was prepared for IL6R-B3.
- IL6R-L (SEQ ID NO: 22) was commonly used as the antibody L chain.
- the amount of binding of each variant to each Fc ⁇ R is the value of the amount of binding to each Fc ⁇ R of the antibody before introduction of the modification (IL6R-BF648 / IL6R-L with 238th Pro in the EU numbering replaced with Asp) as a control.
- the value further divided by 100 was used as the relative binding activity value for each Fc ⁇ R of each variant.
- the horizontal axis shows the relative binding activity value of each variant to Fc ⁇ RIIb, and the vertical axis shows the relative binding activity value of each variant to Fc ⁇ RIIa R type (FIG. 13).
- Table 10 summarizes the results of measuring the KD values of the variants shown in Table 9 for Fc ⁇ RIa, Fc ⁇ RIIaR, Fc ⁇ RIIaH, Fc ⁇ RIIb, and Fc ⁇ RIIIa type V by the method of Reference Example 2.
- the sequence number in the table represents the sequence number of the H chain of the evaluated variant, and the modification represents the modification introduced into IL6R-B3 (SEQ ID NO: 40).
- IL6R-G1d / IL6R-L used as a template for producing IL6R-B3 is indicated by *.
- KD (IIaR) / KD (IIb) and KD (IIaH) / KD (IIb) in the table are the values obtained by dividing the KD value for Fc ⁇ RIIaR of each variant by the KD value for Fc ⁇ RIIb of each variant, The value obtained by dividing the KD value for each variant Fc ⁇ RIIaH by the KD value for each variant Fc ⁇ RIIb is shown.
- KD (IIb) of the parent polypeptide / KD (IIb) of the modified polypeptide refers to a value obtained by dividing the KD value for Fc ⁇ RIIb of the parent polypeptide by the KD value for Fc ⁇ RIIb of each variant.
- Table 10 shows the stronger KD value of the binding activity of each variant to Fc ⁇ RIIaR and Fc ⁇ RIIaH / the stronger KD value of the binding activity of the parent polypeptide to Fc ⁇ RIIaR and Fc ⁇ RIIaH.
- the parent polypeptide refers to a variant having IL6R-B3 (SEQ ID NO: 40) in the H chain.
- the formula 2 described in Reference Example 2 is used. This is a value calculated by using the formula.
- the affinity for Fc ⁇ RIIb was improved compared to IL6R-B3 for any of the variants, and the range of the improvement was 2.1 to 9.7 times.
- the ratio of the KD value of each variant to Fc ⁇ RIIaR / the ratio of the KD value of each variant to Fc ⁇ RIIb, and the KD value of each variant to Fc ⁇ RIIaH / the ratio of the KD value of each variant to Fc ⁇ RIIb are relative to the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH. Represents a typical binding activity to Fc ⁇ RIIb. That is, this value is a value indicating the high binding selectivity of each variant to Fc ⁇ RIIb.
- the ratio of the KD value / Fc ⁇ RIIb to the Fc ⁇ RIIaR of the parent polypeptide IL6R-B3 / IL6R-L, and the ratio of the KD value to the Fc ⁇ RIIaH / KD value to the Fc ⁇ RIIb are 0.3 and 0.2, respectively. This variant also improved the binding selectivity to Fc ⁇ RIIb over the parent polypeptide.
- the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the variant / the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the parent polypeptide is 1 or more when the variant has a binding activity against Fc ⁇ RIIaR and Fc ⁇ RIIaH This means that the stronger binding of the binding activities is equivalent to or less than the stronger binding of the parent polypeptides to Fc ⁇ RIIaR and Fc ⁇ RIIaH. Since this value was 4.6 to 34.0 in the variant obtained this time, it can be said that the stronger binding of the variant obtained this time to Fc ⁇ RIIaR and Fc ⁇ RIIaH was reduced more than that of the parent polypeptide.
- the variant obtained this time has enhanced or reduced the binding activity to Fc ⁇ RIIb while maintaining or reducing the binding activity to Fc ⁇ RIIa R type and H type. It became clear that the selectivity was improved.
- the affinity of each of the variants was reduced compared to IL6R-B3.
- FIG. 14 shows the crystal structure of the Fc (P238D) / Fc ⁇ RIIb extracellular region complex.
- the H chain located on the left side is FcFChain A
- the H chain located on the right side is Fc Chain B.
- the EU numbering 233rd site in Fc Chain A is located near the 113th Lys of EU numbering Fc ⁇ RIIb.
- the electron density of the side chain of E233 has not been observed well, and it is in a highly mobile state.
- FIG. 15 also shows the environment near the EU numbering 330th site in the structure of the Fc (P238D) / Fc ⁇ RIIb extracellular region complex.
- Fc (P238D) Fc Chain A EU numbering around 330th site is a hydrophilic environment composed of Fc ⁇ RIIb EU numbering 85th Ser, 86th Glu, 163rd Lys, etc. I understand that. Therefore, it is speculated that the modification of replacing EU numbering 330th Ala with Lys or Arg contributes to enhanced interaction of Fc ⁇ RIIb with EU numbering 85th Ser or EU numbering 86th Glu. .
- FIG. 16 shows the crystal structures of the Fc (P238D) / Fc ⁇ RIIb extracellular region complex and the Fc (WT) / Fc ⁇ RIIIa extracellular region complex, and the least square method based on the C ⁇ atom distance with respect to Fc ChainhaB.
- the structure of the 271th Pro of the EU numbering is shown. These two structures are in good agreement, but have different three-dimensional structures at the EU numbering 271th Pro site.
- the EU numbering 271 is Pro.
- Example 7 Verification of combination effect of modification that enhances binding to Fc ⁇ RIIb by combining with P238D Among the modifications obtained in Examples 4 and 6, effect to enhance binding to Fc ⁇ RIIb or to Fc ⁇ RIIb The modification
- IL6R-L is commonly used for the antibody L chain, and the antibody is expressed and purified according to the method of Reference Example 1, and each Fc ⁇ R (Fc ⁇ RIa, Fc ⁇ RIIa H type, Fc ⁇ RIIa R type, Fc ⁇ RIIb, Fc ⁇ RIIIa, and Fc ⁇ RIIIa is obtained by the method of Reference Example 2.
- the binding to type V was comprehensively evaluated.
- the relative binding activity was calculated according to the following method.
- the amount of binding of each variant to each Fc ⁇ R is the value of the amount of binding to each Fc ⁇ R of the antibody before introduction of the modification (IL6R-BF648 / IL6R-L with 238th Pro in the EU numbering replaced with Asp) as a control.
- the value further divided by 100 was used as the relative binding activity value for each Fc ⁇ R of each variant.
- the horizontal axis shows the value of the relative binding activity of each variant to Fc ⁇ RIIb, and the vertical axis shows the value of the relative binding activity of each variant to Fc ⁇ RIIa R type (Table 11).
- the sequence number in the table represents the sequence number of the H chain of the evaluated variant, and the modification represents the modification introduced into IL6R-B3 (SEQ ID NO: 40).
- IL6R-G1d / IL6R-L used as a template for producing IL6R-B3 is indicated by *.
- Table 12 summarizes the results of measuring the KD values of the variants shown in Table 11 for Fc ⁇ RIa, Fc ⁇ RIIaR, Fc ⁇ RIIaH, Fc ⁇ RIIb, and Fc ⁇ RIIIa type V by the method of Reference Example 2.
- the sequence number in the table represents the sequence number of the H chain of the evaluated variant, and the modification represents the modification introduced into IL6R-B3 (SEQ ID NO: 40).
- IL6R-G1d / IL6R-L used as a template for producing IL6R-B3 is indicated by *.
- KD (IIaR) / KD (IIb) and KD (IIaH) / KD (IIb) in the table are the values obtained by dividing the KD value for Fc ⁇ RIIaR of each variant by the KD value for Fc ⁇ RIIb of each variant, The value obtained by dividing the KD value for each variant Fc ⁇ RIIaH by the KD value for each variant Fc ⁇ RIIb is shown.
- KD (IIb) of the parent polypeptide / KD (IIb) of the modified polypeptide refers to a value obtained by dividing the KD value for Fc ⁇ RIIb of the parent polypeptide by the KD value for Fc ⁇ RIIb of each variant.
- Table 12 shows the KD value of the stronger binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of each variant / the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the parent polypeptide.
- the parent polypeptide refers to a variant having IL6R-B3 (SEQ ID NO: 40) in the H chain.
- Table 12 since the cells painted in gray were weakly bound to IgG by Fc ⁇ R and could not be analyzed correctly by kinetic analysis, they were described in Reference Example 2 [Formula 2] This is a value calculated by using the formula.
- the ratio of the KD value of each variant to Fc ⁇ RIIaR / the ratio of the KD value of each variant to Fc ⁇ RIIb, and the KD value of each variant to Fc ⁇ RIIaH / the ratio of the KD value of each variant to Fc ⁇ RIIb are relative to the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH. Represents a typical binding activity to Fc ⁇ RIIb. That is, this value is a value indicating the high binding selectivity of each variant to Fc ⁇ RIIb.
- the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the variant / the stronger KD value of the binding activity to Fc ⁇ RIIaR and Fc ⁇ RIIaH of the parent polypeptide is 1 or more when the variant has a binding activity against Fc ⁇ RIIaR and Fc ⁇ RIIaH This means that the stronger binding of the binding activities is equivalent to or less than the stronger binding of the parent polypeptides to Fc ⁇ RIIaR and Fc ⁇ RIIaH.
- the variant obtained this time has enhanced or reduced the binding activity to Fc ⁇ RIIb while maintaining or reducing the binding activity to Fc ⁇ RIIa R type and H type. It became clear that the selectivity was improved.
- the affinity of each of the variants was reduced compared to IL6R-B3.
- the prepared plasmid was transiently introduced into human fetal kidney cancer cell-derived HEK293H strain (Invitrogen) or FreeStyle293 cell (Invitrogen) to express the antibody. After the obtained culture supernatant was collected, the culture supernatant was obtained through a 0.22 ⁇ m filter MILLEX®-GV (Millipore) or a 0.45 ⁇ m filter MILLEX®-GV (Millipore). From the obtained culture supernatant, the antibody was purified by rProtein A Sepharose Fast Flow (GE Healthcare) or Protein G Sepharose 4 Fast Flow (GE Healthcare) by a method known to those skilled in the art.
- the purified antibody concentration was measured by measuring the absorbance at 280 nm using a spectrophotometer, and the antibody concentration was calculated from the obtained value using an extinction coefficient calculated by a method such as PACE (Protein Science 1995; 4: 2411-2423).
- Fc ⁇ RIIIb was prepared with reference to J. Clin. Invest., 1989, 84, 1688-1691.
- the obtained gene fragment was inserted into an animal cell expression vector to prepare an expression vector.
- the produced expression vector was transiently introduced into human fetal kidney cancer cell-derived FreeStyle293 cells (Invitrogen) to express the target protein.
- the target protein was expressed in the presence of Kifunesine at a final concentration of 10 ⁇ g / mL so that the sugar chain added to Fc ⁇ RIIb became a high mannose type.
- the culture supernatant was obtained through a 0.22 ⁇ m filter. In principle, the obtained culture supernatant was purified by the following four steps.
- the first step is cation exchange column chromatography (SP Sepharose FF)
- the second step is affinity column chromatography against His tag (HisTrap ⁇ ⁇ ⁇ ⁇ HP)
- the third step is gel filtration column chromatography (Superdex200)
- the fourth step is aseptic Filtration was performed.
- Fc ⁇ RI anion exchange column chromatography using Q ⁇ ⁇ sepharose FF in the first step was performed.
- the absorbance at 280 nm was measured using a spectrophotometer, and the concentration of the purified protein was calculated from the obtained value using the extinction coefficient calculated by the method of PACE or the like (Protein Science 1995; 4: 2411-2423).
- Biacore® T100 GE Healthcare
- Biacore® T200 GE Healthcare
- Biacore® A100 GE Healthcare
- Biacore® 4000 an interaction analysis between each modified antibody and the Fc ⁇ receptor prepared above was performed.
- HBS-EP + GE Healthcare
- Series S Sensor Chip CM5 GE Healthcare
- Series S sensor Chip CM4 GE Healthcare
- antigen peptide ProteinA (Thermo Scientific)
- Protein A / G Thermo Scientific
- Protein L ACTIGEN
- a chip on which BioVision was immobilized, or an antigen peptide that had been biotinylated in advance against Series ⁇ ⁇ S Sensor Chip SA (certified) (GE Healthcare) and immobilized was used.
- the target antibody was captured by these sensor chips, the Fc ⁇ receptor diluted with the running buffer was allowed to interact, the binding amount to the antibody was measured, and the antibodies were compared. However, since the binding amount of Fc ⁇ receptor depends on the amount of captured antibody, comparison was made with a correction value obtained by dividing the binding amount of Fc ⁇ receptor by the capture amount of each antibody. Further, the antibody captured on the sensor chip was washed by reacting 10 mM mM glycine-HCl, pH 1.5, and the sensor chip was regenerated and used repeatedly.
- a polypeptide comprising an Fc region that maintains or decreases binding activity to Fc ⁇ RIIa of both H-type and R-type gene polymorphisms and has enhanced binding activity to Fc ⁇ RIIb.
- Peptides were provided. Patients with either R type or H type polymorphism by using the polypeptide with enhanced selectivity for binding to Fc ⁇ RIIb against any Fc ⁇ RIIa gene polymorphism (H type, R type) In contrast, it is possible to transmit an inhibitory signal of the inflammatory immune response via phosphorylation of ITIM of Fc ⁇ RIIb.
- the Fc of an antibody the property of selectively binding to Fc ⁇ RIIb, there is a possibility that anti-antibody production can be suppressed through an immunosuppressive action via Fc ⁇ RIIb.
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Abstract
Description
B細胞以外にも、IgEの受容体であるFcεRIと結合するIgEのFc部分とFcγRIIbに対する結合を増強したIgGのFc部分とを融合させた分子を使って、マスト細胞上のFcεRIとFcγRIIbとを架橋することで、FcγRIIbのリン酸化を引き起こし、FcεRI依存的なカルシウムの流入を抑制することが報告されており、これはFcγRIIbに対する結合を増強することでFcγRIIbの刺激を介した脱顆粒の阻害が可能であることを示唆している (非特許文献31)。
これらのことから、FcγRIIbに対する結合活性を向上させたFcを持つ抗体が自己免疫疾患等の炎症性疾患の治療薬として有望であることが示唆される。
FcγRIIbに対する結合がIgG1と比べて増強していたとしても、FcγRIIbを発現せずFcγRIIaを発現している血小板のような細胞(非特許文献8)に関しては、FcγRIIbに対する結合の増強ではなく、FcγRIIaに対する結合の増強の効果のみが影響すると考えられる。例えば、VEGFに対する抗体であるbevacizumabを投与された患者群では血栓塞栓症のリスクが上昇することが知られている(非特許文献38)。また、CD40 ligandに対する抗体の臨床開発試験においても同様に血栓塞栓症が観察され、臨床試験が中止された(非特許文献39)。これらのいずれの抗体の場合も、動物モデルなどを使ったその後の研究により、投与した抗体が血小板上のFcγRIIaに対する結合を介して血小板を凝集し、血栓を形成することが示唆されている(非特許文献40, 非特許文献41)。自己免疫疾患の一つである全身性エリテマトーデスにおいてはFcγRIIa依存的な機構によって血小板が活性化し、血小板の活性化が重症度と相関するという報告がある(非特許文献42)。このような血栓塞栓症を発症するリスクが元々高い患者に対して、FcγRIIaに対する結合を増強させた抗体を投与することは、仮にFcγRIIbに対する結合が増強されていたとしても、血栓塞栓症の発症リスクを一層高めることになり、極めて危険である。
また、FcγRIIaに対する結合を増強させた抗体はマクロファージを介した抗体依存的貪食活性 (ADCP)が増強することが報告されている(非特許文献43)。抗体の抗原がマクロファージによって貪食されると同時に抗体自身も貪食されることになるが、その場合その抗体由来のペプチド断片も抗原提示され、抗原性が高くなると考えられ、抗体に対する抗体(抗抗体)の産生リスクを上昇させると考えられる。すなわち、FcγRIIaに対する結合を増強すると、抗体に対する抗体の産生リスクを高め、医薬品としての価値を著しく減じてしまう。
すなわち、FcγRIIaに対する結合を増強すると、血小板凝集を介した血栓形成のリスクを上昇させてしまい、また抗原性が高くなり、抗抗体産生のリスクを高めてしまうという点で、医薬品としての価値を著しく減じてしまう。
また、FcγRIIbを欠損した樹状細胞、あるいは抗FcγRIIb抗体によりFcγRIIbと抗体のFc部分との相互作用が阻害された樹状細胞においては、樹状細胞の成熟が自発的に起こることが報告されている(非特許文献46,非特許文献47)。この報告から、FcγRIIbは炎症などが生じていない定常状態において、積極的に樹状細胞の成熟を抑制していることが示唆される。樹状細胞表面にはFcγRIIbに加えて、FcγRIIaも発現していることから、例え抑制型のFcγRIIbに対する結合を増強したとしても、活性型のFcγRIIa等に対する結合も増強されていれば、結果として樹状細胞の成熟を促してしまうと考えられる。すなわち、FcγRIIbに対する結合活性だけではなく、FcγRIIaに対する結合活性に対してFcγRIIbに対する結合活性の比率を改善することが、抗体に免疫抑制的な作用をもたらす上では重要であると考えられる。
このことから、FcγRIIbの結合を介した免疫抑制的な作用を利用した医薬品の創出を考えた場合、FcγRIIbに対する結合活性を増強するのみならず、FcγRIIa H型、R型いずれの遺伝子多型に対しても結合を天然型IgG1と同程度に維持するか、それ以下に減弱したFcが求められている。
これに対して、これまでにFc領域にアミノ酸改変を導入することで、FcγRIIbに対する結合の選択性を上昇させた例が報告されている(非特許文献48)。しかし、この文献中で報告されているFcγRIIbに対する選択性が改善したとされるいずれの変異体においても、天然型IgG1と比べてFcγRIIbに対する結合が減少していた。そのため、これらの変異体が実際にFcγRIIbを介した免疫抑制的な反応をIgG1以上に引き起こすことは困難であると考えられる。
また先に述べたアゴニスト抗体においてもFcγRIIbは重要な役割を果たしているため、その結合活性の増強をすることで、アゴニスト活性の増強も期待される。しかしながら、FcγRIIaに対する結合も同様にして増強してしまうと、目的としないADCC活性やADCP活性などを発揮してしまい、副作用が出てしまう恐れがある。そのような観点からも、FcγRIIbに対して選択的に結合活性を増強できることが好ましい。
〔1〕 少なくとも一つのアミノ酸が改変された抗体Fc領域を含むポリペプチド変異体であって、親ポリペプチドと比較して、FcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性が維持あるいは減少し、FcγRIIbに対する結合活性が増強し、かつ〔ポリペプチド変異体のFcγRIIa(R型)に対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕の値が1.2以上であるポリペプチド。
〔2〕 〔ポリペプチド変異体のFcγRIIa(H型)に対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕の値が4.2以上である、〔1〕に記載のポリペプチド。
〔3〕 〔親ポリペプチドのFcγRIIbに対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕の値が1.6以上である、〔1〕または〔2〕に記載のポリペプチド。
〔4〕 〔ポリペプチド変異体のFcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性のうち強い方のKD値〕/〔親ポリペプチドのFcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性のうち強い方のKD値〕の値が0.7以上である、〔1〕から〔3〕のいずれか一項に記載のポリペプチド。
〔5〕 親ポリペプチドと比較して、FcγRIIIaに対する結合活性が維持あるいは減少した、〔1〕から〔4〕のいずれか一項に記載のポリペプチド。
〔6〕 親ポリペプチドと比較して、FcγRIaに対する結合活性が維持あるいは減少した、〔1〕から〔5〕のいずれか一項に記載のポリペプチド。
〔7〕 アミノ酸改変が、EUナンバリング238番目のProのAspへの置換又はEUナンバリング328番目のLeuのGluへの置換である、〔1〕から〔6〕のいずれか一項に記載のポリペプチド。
〔8〕アミノ酸改変が、EUナンバリング238番目のProのAspへの置換、およびEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換である、〔1〕から〔7〕のいずれか一項に記載のポリペプチド。
〔9〕 前記抗体Fc領域を含むポリペプチドがIgG抗体である、〔1〕から〔8〕のいずれか一項に記載のポリペプチド。
〔10〕 前記抗体Fc領域を含むポリペプチドがFc融合タンパク質分子である、〔1〕から〔8〕のいずれか一項に記載のポリペプチド。
〔11〕 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、親ポリペプチドと比較して、FcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性を維持あるいは減少し、かつFcγRIIbに対する結合活性を増強する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
〔12〕 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、生体に投与された場合に、親ポリペプチドと比較して、該ポリペプチドに対する抗体の産生を抑制する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
〔13〕 アミノ酸改変が、EUナンバリング238番目のProのAspへの置換、およびEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換である、〔11〕または〔12〕に記載の方法。
〔14〕 前記抗体Fc領域を含むポリペプチドがIgG抗体である、〔11〕から〔13〕のいずれか一項に記載の方法。
〔15〕 前記抗体Fc領域を含むポリペプチドがFc融合タンパク質分子である、〔11〕から〔13〕のいずれか一項に記載の方法。
〔16〕 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、親ポリペプチドと比較して、FcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性が維持あるいは減少され、かつFcγRIIbに対する結合活性が増強されたポリペプチドを製造する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
〔17〕 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、生体に投与された場合に、親ポリペプチドと比較して、該ポリペプチドに対する抗体の産生が抑制されたポリペプチドを製造する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
〔18〕 アミノ酸改変が、EUナンバリング238番目のProのAspへの置換、およびEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換である、〔16〕または〔17〕に記載の方法。
〔19〕 前記抗体Fc領域を含むポリペプチドがIgG抗体である、〔16〕から〔18〕のいずれか一項に記載の方法。
〔20〕 前記抗体Fc領域を含むポリペプチドがFc融合タンパク質分子である、〔16〕から〔18〕のいずれか一項に記載の方法。
〔21〕 〔16〕から〔20〕のいずれか一項に記載の方法により製造されたポリペプチド。
〔22〕 〔1〕から〔10〕、〔21〕のいずれか一項に記載のポリペプチドを含有する医薬組成物。
〔23〕 〔1〕から〔10〕、〔21〕のいずれか一項に記載のポリペプチドを含有するB細胞、マスト細胞、樹状細胞および/または好塩基球の活性化抑制剤。
〔24〕 〔1〕から〔10〕、〔21〕のいずれか一項に記載のポリペプチドを含有する免疫炎症性疾患の治療剤又は予防剤。
〔25〕 免疫炎症性疾患が自己免疫疾患であって、自己抗原に対する抗体の産生が原因と考えられる疾患である、〔24〕に記載の治療剤又は予防剤。
〔26〕 〔1〕から〔10〕、〔21〕のいずれか一項に記載のポリペプチドを含有する疾患治療剤であって、該疾患が生体に必要なタンパク質を欠損する疾患である治療剤。
〔27〕 〔1〕から〔10〕、〔21〕のいずれか一項に記載のポリペプチドを含有する抗ウィルス剤。
また本発明は、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドを対象へ投与する工程を含む、免疫炎症性疾患の治療方法または予防方法に関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチド、または本発明の医薬組成物を含む、本発明の治療方法または予防方法に用いるためのキットに関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチドの、免疫炎症性疾患の治療剤または予防剤の製造における使用に関する。また本発明は、本発明の治療方法または予防方法に使用するための、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドに関する。また本発明は、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドを対象へ投与する工程を含む、B細胞、マスト細胞、樹状細胞および/または好塩基球の活性化抑制方法に関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチド、または本発明の医薬組成物を含む、本発明の抑制方法に用いるためのキットに関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチドの、B細胞、マスト細胞、樹状細胞および/または好塩基球の活性化抑制剤の製造における使用に関する。また本発明は、本発明の抑制方法に使用するための、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドに関する。また本発明は、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドを対象へ投与する工程を含む、生体に必要なタンパク質を欠損する疾患の治療方法に関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチド、または本発明の医薬組成物を含む、本発明の治療方法に用いるためのキットに関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチドの、生体に必要なタンパク質を欠損する疾患の治療剤の製造における使用に関する。また本発明は、本発明の治療方法に使用するための、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドに関する。また本発明は、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドを対象へ投与する工程を含む、ウィルスの抑制方法に関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチド、または本発明の医薬組成物を含む、本発明の抑制方法に用いるためのキットに関する。また本発明は、本発明のポリペプチドもしくは本発明の製造方法により製造されたポリペプチドの、抗ウィルス剤の製造における使用に関する。また本発明は、本発明の抑制方法に使用するための、本発明のポリペプチドまたは本発明の製造方法により製造されたポリペプチドに関する。
より具体的には、EUナンバリング238番目ProのAspへの置換又はEUナンバリング328番目のLeuのGluへの置換を含む抗体Fc領域を含むポリペプチド、およびEUナンバリング238番目ProのAspへの置換といくつかの特定のアミノ酸置換との組み合わせを含む抗体Fc領域を含むポリペプチドを提供する。さらに本発明は親ポリペプチドと比較して、いずれの遺伝子多型のFcγRIIaに対する結合活性を維持あるいは減少させ、かつFcγRIIbに対する結合活性を増強させる方法を提供する。また本発明は生体に投与された場合に、親ポリペプチドと比較して、抗体の産生を抑制する方法を提供する。
FcγRIIAのポリヌクレオチド配列及びアミノ酸配列は、それぞれ配列番号:3(BC020823.1)及び4(AAH20823.1)に、
FcγRIIBのポリヌクレオチド配列及びアミノ酸配列は、それぞれ配列番号:5(BC146678.1)及び6(AAI46679.1)に、
FcγRIIIAのポリヌクレオチド配列及びアミノ酸配列は、それぞれ配列番号:7(BC033678.1)及び8(AAH33678.1)に、及び
FcγRIIIBのポリヌクレオチド配列及びアミノ酸配列は、それぞれ配列番号:9(BC128562.1)及び10(AAI28563.1)に記載されている(カッコ内はRefSeq登録番号を示す)。
また、上記の測定法で測定したKD値において、KD値が1μM以上増加していることが好ましく、2μM以上、3μM以上、5μM以上、10μM以上、20μM以上、50μM以上、100μM以上増加していることがさらに好ましい。また、上記の測定法で測定したKD値において、KD値が0.0001μM以上であることが好ましく、0.001μM以上、0.01μM以上、0.1μM以上、0.5μM以上、1μM以上、2μM以上、3μM以上、5μM以上、10μM以上、100μM以上、1000μM以上であることが更に好ましい。
また、上記の測定法で測定したKD値において、KD値が0.001μM以上低下していることが好ましく、0.01μM、0.1μM、1μM以上、2μM以上、3μM以上、5μM以上、10μM以上、20μM以上、50μM以上、100μM以上低下していることがさらに好ましい。
また、上記の測定法で測定したKD値において、KD値が5μM以下であることが好ましく、3μM以下、1μM以下、0.5μM以下、0.1μM以下、0.01μM以下、0.001μM以下、0.0001μM以下であることが更に好ましい。
本発明において、FcγRIIbに対する結合活性が増強したとは、例えば、上記の測定法で測定したKD値において、〔親ポリペプチドのKD値〕/〔ポリペプチド変異体のKD値〕のKD値比が、好ましくは1.6以上、2以上、3以上、さらに好ましくは、5以上、10以上、20以上、30以上、50以上となることを意味する。
また、FcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性が維持あるいは減少したとは、例えば、上記の測定法で測定したKD値において、〔ポリペプチド変異体のFcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性のうち強い方のKD値〕/〔親ポリペプチドのFcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性のうち強い方のKD値〕のKD値比が、好ましくは0.7以上、1以上、2以上、3以上、さらに好ましくは、5以上、10以上、20以上、30以上、50以上となることを意味する。
FcγRIIIaあるいはFcγRIaに対する結合活性が維持あるいは減少したとは、例えば、上記の測定法で測定したKD値において、〔ポリペプチド変異体のKD値〕/〔親ポリペプチドのKD値〕のKD値比が、好ましくは1以上、2以上、3以上、さらに好ましくは、5以上、10以上、20以上、30以上、50以上となることを意味する。
FcγRIIa(R型)とFcγRIIbの間での結合選択性としては、例えば、上記の測定法で測定したKD値において、〔ポリペプチド変異体のFcγRIIa(R型)に対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕のKD値比が、好ましくは1.2以上、2以上、3以上である。さらに好ましくは、5以上、10以上、20以上、30以上である。
FcγRIIa(H型)とFcγRIIbの間での結合選択性としては、例えば、上記の測定法で測定したKD値において、〔ポリペプチド変異体のFcγRIIa(H型)に対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕のKD値比が、好ましくは4.2以上、5以上、10以上である。さらに好ましくは、20以上、30以上、50以上、100以上、200以上である。
上記の改変は1箇所であってもよいし、2箇所以上の組み合わせであってもよい。そのような改変で好ましい例としては、表6~7、表9~12に記載の改変が挙げられる。
アミノ酸残基を置換する場合には、別のアミノ酸残基に置換することで、例えば次の(a)~(c)のような点について改変する事を目的とする。
(a) シート構造、若しくは、らせん構造の領域におけるポリペプチドの背骨構造;
(b) 標的部位における電荷若しくは疎水性、または
(c)側鎖の大きさ。
(1) 疎水性: ノルロイシン、met、ala、val、leu、ile;
(2) 中性親水性: cys、ser、thr、asn、gln;
(3) 酸性: asp、glu;
(4) 塩基性: his、lys、arg;
(5) 鎖の配向に影響する残基: gly、pro;及び
(6) 芳香族性: trp、tyr、phe。
・哺乳動物の抗体産生細胞
・抗体をコードするDNAを含む発現ベクターで形質転換された真核細胞
さらに、本発明は上述のいずれかに記載のアミノ酸配列が改変されたFc領域を含む抗体を提供する。
ケモカインの例としては、CCL1~CCL28などのCCケモカイン、CXCL1~CXCL17などのCXCケモカイン、XCL1~XCL2などのCケモカイン、CX3CL1などのCX3Cケモカインを挙げることができる。
その他の抗原としては下記のような分子;17-IA、4-1BB、4Dc、6-ケト-PGF1a、8-イソ-PGF2a、8-オキソ-dG、A1 アデノシン受容体、A33、ACE、ACE-2、アクチビン、アクチビンA、アクチビンAB、アクチビンB、アクチビンC、アクチビンRIA、アクチビンRIA ALK-2、アクチビンRIB ALK-4、アクチビンRIIA、アクチビンRIIB、ADAM、ADAM10、ADAM12、ADAM15、ADAM17/TACE、ADAM8、ADAM9、ADAMTS、ADAMTS4、ADAMTS5、アドレシン、aFGF、ALCAM、ALK、ALK-1、ALK-7、アルファ-1-アンチトリプシン、アルファ-V/ベータ-1アンタゴニスト、ANG、Ang、APAF-1、APE、APJ、APP、APRIL、AR、ARC、ART、アルテミン、抗Id、ASPARTIC、心房性ナトリウム利尿因子、av/b3インテグリン、Axl、b2M、B7-1、B7-2、B7-H、B-リンパ球刺激因子(BlyS)、BACE、BACE-1、Bad、BAFF、BAFF-R、Bag-1、BAK、Bax、BCA-1、BCAM、Bcl、BCMA、BDNF、b-ECGF、bFGF、BID、Bik、BIM、BLC、BL-CAM、BLK、BMP、BMP-2 BMP-2a、BMP-3 オステオゲニン(Osteogenin)、BMP-4 BMP-2b、BMP-5、BMP-6 Vgr-1、BMP-7(OP-1)、BMP-8(BMP-8a、OP-2)、BMPR、BMPR-IA(ALK-3)、BMPR-IB(ALK-6)、BRK-2、RPK-1、BMPR-II(BRK-3)、BMP、b-NGF、BOK、ボンベシン、骨由来神経栄養因子、BPDE、BPDE-DNA、BTC、補体因子3(C3)、C3a、C4、C5、C5a、C10、CA125、CAD-8、カルシトニン、cAMP、癌胎児性抗原(CEA)、癌関連抗原、カテプシンA、カテプシンB、カテプシンC/DPPI、カテプシンD、カテプシンE、カテプシンH、カテプシンL、カテプシンO、カテプシンS、カテプシンV、カテプシンX/Z/P、CBL、CCI、CCK2、CCL、CCL1、CCL11、CCL12、CCL13、CCL14、CCL15、CCL16、CCL17、CCL18、CCL19、CCL2、CCL20、CCL21、CCL22、CCL23、CCL24、CCL25、CCL26、CCL27、CCL28、CCL3、CCL4、CCL5、CCL6、CCL7、CCL8、CCL9/10、CCR、CCR1、CCR10、CCR10、CCR2、CCR3、CCR4、CCR5、CCR6、CCR7、CCR8、CCR9、CD1、CD2、CD3、CD3E、CD4、CD5、CD6、CD7、CD8、CD10、CD11a、CD11b、CD11c、CD13、CD14、CD15、CD16、CD18、CD19、CD20、CD21、CD22、CD23、CD25、CD27L、CD28、CD29、CD30、CD30L、CD32、CD33(p67タンパク質)、CD34、CD38、CD40、CD40L、CD44、CD45、CD46、CD49a、CD52、CD54、CD55、CD56、CD61、CD64、CD66e、CD74、CD80(B7-1)、CD89、CD95、CD123、CD137、CD138、CD140a、CD146、CD147、CD148、CD152、CD164、CEACAM5、CFTR、cGMP、CINC、ボツリヌス菌毒素、ウェルシュ菌毒素、CKb8-1、CLC、CMV、CMV UL、CNTF、CNTN-1、COX、C-Ret、CRG-2、CT-1、CTACK、CTGF、CTLA-4、CX3CL1、CX3CR1、CXCL、CXCL1、CXCL2、CXCL3、CXCL4、CXCL5、CXCL6、CXCL7、CXCL8、CXCL9、CXCL10、CXCL11、CXCL12、CXCL13、CXCL14、CXCL15、CXCL16、CXCR、CXCR1、CXCR2、CXCR3、CXCR4、CXCR5、CXCR6、サイトケラチン腫瘍関連抗原、DAN、DCC、DcR3、DC-SIGN、補体制御因子(Decay accelerating factor)、des(1-3)-IGF-I(脳IGF-1)、Dhh、ジゴキシン、DNAM-1、Dnase、Dpp、DPPIV/CD26、Dtk、ECAD、EDA、EDA-A1、EDA-A2、EDAR、EGF、EGFR(ErbB-1)、EMA、EMMPRIN、ENA、エンドセリン受容体、エンケファリナーゼ、eNOS、Eot、エオタキシン1、EpCAM、エフリンB2/EphB4、EPO、ERCC、E-セレクチン、ET-1、ファクターIIa、ファクターVII、ファクターVIIIc、ファクターIX、線維芽細胞活性化タンパク質(FAP)、Fas、FcR1、FEN-1、フェリチン、FGF、FGF-19、FGF-2、FGF3、FGF-8、FGFR、FGFR-3、フィブリン、FL、FLIP、Flt-3、Flt-4、卵胞刺激ホルモン、フラクタルカイン、FZD1、FZD2、FZD3、FZD4、FZD5、FZD6、FZD7、FZD8、FZD9、FZD10、G250、Gas6、GCP-2、GCSF、GD2、GD3、GDF、GDF-1、GDF-3(Vgr-2)、GDF-5(BMP-14、CDMP-1)、GDF-6(BMP-13、CDMP-2)、GDF-7(BMP-12、CDMP-3)、GDF-8(ミオスタチン)、GDF-9、GDF-15(MIC-1)、GDNF、GDNF、GFAP、GFRa-1、GFR-アルファ1、GFR-アルファ2、GFR-アルファ3、GITR、グルカゴン、Glut4、糖タンパク質IIb/IIIa(GPIIb/IIIa)、GM-CSF、gp130、gp72、GRO、成長ホルモン放出因子、ハプテン(NP-capまたはNIP-cap)、HB-EGF、HCC、HCMV gBエンベロープ糖タンパク質、HCMV gHエンベロープ糖タンパク質、HCMV UL、造血成長因子(HGF)、Hep B gp120、ヘパラナーゼ、Her2、Her2/neu(ErbB-2)、Her3(ErbB-3)、Her4(ErbB-4)、単純ヘルペスウイルス(HSV) gB糖タンパク質、HSV gD糖タンパク質、HGFA、高分子量黒色腫関連抗原(HMW-MAA)、HIV gp120、HIV IIIB gp 120 V3ループ、HLA、HLA-DR、HM1.24、HMFG PEM、HRG、Hrk、ヒト心臓ミオシン、ヒトサイトメガロウイルス(HCMV)、ヒト成長ホルモン(HGH)、HVEM、I-309、IAP、ICAM、ICAM-1、ICAM-3、ICE、ICOS、IFNg、Ig、IgA受容体、IgE、IGF、IGF結合タンパク質、IGF-1R、IGFBP、IGF-I、IGF-II、IL、IL-1、IL-1R、IL-2、IL-2R、IL-4、IL-4R、IL-5、IL-5R、IL-6、IL-6R、IL-8、IL-9、IL-10、IL-12、IL-13、IL-15、IL-18、IL-18R、IL-23、インターフェロン(INF)-アルファ、INF-ベータ、INF-ガンマ、インヒビン、iNOS、インスリンA鎖、インスリンB鎖、インスリン様増殖因子1、インテグリンアルファ2、インテグリンアルファ3、インテグリンアルファ4、インテグリンアルファ4/ベータ1、インテグリンアルファ4/ベータ7、インテグリンアルファ5(アルファV)、インテグリンアルファ5/ベータ1、インテグリンアルファ5/ベータ3、インテグリンアルファ6、インテグリンベータ1、インテグリンベータ2、インターフェロンガンマ、IP-10、I-TAC、JE、カリクレイン2、カリクレイン5、カリクレイン6、カリクレイン11、カリクレイン12、カリクレイン14、カリクレイン15、カリクレインL1、カリクレインL2、カリクレインL3、カリクレインL4、KC、KDR、ケラチノサイト増殖因子(KGF)、ラミニン5、LAMP、LAP、LAP(TGF-1)、潜在的TGF-1、潜在的TGF-1 bp1、LBP、LDGF、LECT2、レフティ、ルイス-Y抗原、ルイス-Y関連抗原、LFA-1、LFA-3、Lfo、LIF、LIGHT、リポタンパク質、LIX、LKN、Lptn、L-セレクチン、LT-a、LT-b、LTB4、LTBP-1、肺表面、黄体形成ホルモン、リンホトキシンベータ受容体、Mac-1、MAdCAM、MAG、MAP2、MARC、MCAM、MCAM、MCK-2、MCP、M-CSF、MDC、Mer、METALLOPROTEASES、MGDF受容体、MGMT、MHC(HLA-DR)、MIF、MIG、MIP、MIP-1-アルファ、MK、MMAC1、MMP、MMP-1、MMP-10、MMP-11、MMP-12、MMP-13、MMP-14、MMP-15、MMP-2、MMP-24、MMP-3、MMP-7、MMP-8、MMP-9、MPIF、Mpo、MSK、MSP、ムチン(Muc1)、MUC18、ミュラー管抑制物質、Mug、MuSK、NAIP、NAP、NCAD、N-Cアドヘリン、NCA 90、NCAM、NCAM、ネプリライシン、ニューロトロフィン-3、-4、または-6、ニュールツリン、神経成長因子(NGF)、NGFR、NGF-ベータ、nNOS、NO、NOS、Npn、NRG-3、NT、NTN、OB、OGG1、OPG、OPN、OSM、OX40L、OX40R、p150、p95、PADPr、副甲状腺ホルモン、PARC、PARP、PBR、PBSF、PCAD、P-カドヘリン、PCNA、PDGF、PDGF、PDK-1、PECAM、PEM、PF4、PGE、PGF、PGI2、PGJ2、PIN、PLA2、胎盤性アルカリホスファターゼ(PLAP)、PlGF、PLP、PP14、プロインスリン、プロレラキシン、プロテインC、PS、PSA、PSCA、前立腺特異的膜抗原(PSMA)、PTEN、PTHrp、Ptk、PTN、R51、RANK、RANKL、RANTES、RANTES、レラキシンA鎖、レラキシンB鎖、レニン、呼吸器多核体ウイルス(RSV)F、RSV Fgp、Ret、リウマイド因子、RLIP76、RPA2、RSK、S100、SCF/KL、SDF-1、SERINE、血清アルブミン、sFRP-3、Shh、SIGIRR、SK-1、SLAM、SLPI、SMAC、SMDF、SMOH、SOD、SPARC、Stat、STEAP、STEAP-II、TACE、TACI、TAG-72(腫瘍関連糖タンパク質-72)、TARC、TCA-3、T細胞受容体(例えば、T細胞受容体アルファ/ベータ)、TdT、TECK、TEM1、TEM5、TEM7、TEM8、TERT、睾丸PLAP様アルカリホスファターゼ、TfR、TGF、TGF-アルファ、TGF-ベータ、TGF-ベータ Pan Specific、TGF-ベータRI(ALK-5)、TGF-ベータRII、TGF-ベータRIIb、TGF-ベータRIII、TGF-ベータ1、TGF-ベータ2、TGF-ベータ3、TGF-ベータ4、TGF-ベータ5、トロンビン、胸腺Ck-1、甲状腺刺激ホルモン、Tie、TIMP、TIQ、組織因子、TMEFF2、Tmpo、TMPRSS2、TNF、TNF-アルファ、TNF-アルファベータ、TNF-ベータ2、TNFc、TNF-RI、TNF-RII、TNFRSF10A(TRAIL R1 Apo-2、DR4)、TNFRSF10B(TRAIL R2 DR5、KILLER、TRICK-2A、TRICK-B)、TNFRSF10C(TRAIL R3 DcR1、LIT、TRID)、TNFRSF10D(TRAIL R4 DcR2、TRUNDD)、TNFRSF11A(RANK ODF R、TRANCE R)、TNFRSF11B(OPG OCIF、TR1)、TNFRSF12(TWEAK R FN14)、TNFRSF13B(TACI)、TNFRSF13C(BAFF R)、TNFRSF14(HVEM ATAR、HveA、LIGHT R、TR2)、TNFRSF16(NGFR p75NTR)、TNFRSF17(BCMA)、TNFRSF18(GITR AITR)、TNFRSF19(TROY TAJ、TRADE)、TNFRSF19L(RELT)、TNFRSF1A(TNF RI CD120a、p55-60)、TNFRSF1B(TNF RII CD120b、p75-80)、TNFRSF26(TNFRH3)、TNFRSF3(LTbR TNF RIII、TNFC R)、TNFRSF4(OX40 ACT35、TXGP1 R)、TNFRSF5(CD40 p50)、TNFRSF6(Fas Apo-1、APT1、CD95)、TNFRSF6B(DcR3 M68、TR6)、TNFRSF7(CD27)、TNFRSF8(CD30)、TNFRSF9(4-1BB CD137、ILA)、TNFRSF21(DR6)、TNFRSF22(DcTRAIL R2 TNFRH2)、TNFRST23(DcTRAIL R1 TNFRH1)、TNFRSF25(DR3 Apo-3、LARD、TR-3、TRAMP、WSL-1)、TNFSF10(TRAIL Apo-2リガンド、TL2)、TNFSF11(TRANCE/RANKリガンド ODF、OPGリガンド)、TNFSF12(TWEAK Apo-3リガンド、DR3リガンド)、TNFSF13(APRIL TALL2)、TNFSF13B(BAFF BLYS、TALL1、THANK、TNFSF20)、TNFSF14(LIGHT HVEMリガンド、LTg)、TNFSF15(TL1A/VEGI)、TNFSF18(GITRリガンド AITRリガンド、TL6)、TNFSF1A(TNF-a コネクチン(Conectin)、DIF、TNFSF2)、TNFSF1B(TNF-b LTa、TNFSF1)、TNFSF3(LTb TNFC、p33)、TNFSF4(OX40リガンド gp34、TXGP1)、TNFSF5(CD40リガンド CD154、gp39、HIGM1、IMD3、TRAP)、TNFSF6(Fasリガンド Apo-1リガンド、APT1リガンド)、TNFSF7(CD27リガンド CD70)、TNFSF8(CD30リガンド CD153)、TNFSF9(4-1BBリガンド CD137リガンド)、TP-1、t-PA、Tpo、TRAIL、TRAIL R、TRAIL-R1、TRAIL-R2、TRANCE、トランスフェリン受容体、TRF、Trk、TROP-2、TSG、TSLP、腫瘍関連抗原CA125、腫瘍関連抗原発現ルイスY関連炭水化物、TWEAK、TXB2、Ung、uPAR、uPAR-1、ウロキナーゼ、VCAM、VCAM-1、VECAD、VE-Cadherin、VE-cadherin-2、VEFGR-1(flt-1)、VEGF、VEGFR、VEGFR-3(flt-4)、VEGI、VIM、ウイルス抗原、VLA、VLA-1、VLA-4、VNRインテグリン、フォン・ヴィレブランド因子、WIF-1、WNT1、WNT2、WNT2B/13、WNT3、WNT3A、WNT4、WNT5A、WNT5B、WNT6、WNT7A、WNT7B、WNT8A、WNT8B、WNT9A、WNT9A、WNT9B、WNT10A、WNT10B、WNT11、WNT16、XCL1、XCL2、XCR1、XCR1、XEDAR、XIAP、XPD、HMGB1、IgA、Aβ、CD81, CD97, CD98, DDR1, DKK1, EREG、Hsp90, IL-17/IL-17R、IL-20/IL-20R、酸化LDL, PCSK9, prekallikrein , RON, TMEM16F、SOD1, Chromogranin A, Chromogranin B、tau, VAP1、高分子キニノーゲン、IL-31、IL-31R、Nav1.1、Nav1.2、Nav1.3、Nav1.4、Nav1.5、Nav1.6、Nav1.7、Nav1.8、Nav1.9、EPCR、C1, C1q, C1r, C1s, C2, C2a, C2b, C3, C3a, C3b, C4, C4a, C4b, C5, C5a, C5b, C6, C7, C8, C9, factor B, factor D, factor H, properdin、sclerostin、fibrinogen, fibrin, prothrombin, thrombin, 組織因子, factor V, factor Va, factor VII, factor VIIa, factor VIII, factor VIIIa, factor IX, factor IXa, factor X, factor Xa, factor XI, factor XIa, factor XII, factor XIIa, factor XIII, factor XIIIa, TFPI, antithrombin III, EPCR, トロンボモデュリン、TAPI, tPA, plasminogen, plasmin, PAI-1, PAI-2、GPC3、Syndecan-1、Syndecan-2、Syndecan-3、Syndecan-4、LPA、S1Pならびにホルモンおよび成長因子のための受容体が例示され得る。
他のタンパク質、生理活性ペプチドとしては、例えば受容体、接着分子、リガンド、酵素が挙げられるが、これらに限定されるものではない。
例えば以下の工程を含む製造方法を挙げることができる;
(a)抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加える工程、
(b)前記工程(a)で改変されたポリペプチドの、FcγRIIaに対する結合活性およびFcγRIIbに対する結合活性を測定する工程、および
(c)親ポリペプチドと比較して、FcγRIIaに対する結合活性が維持あるいは減少し、かつFcγRIIbに対する結合活性が増強したポリペプチドを選択する工程。
(a)親ポリペプチドと比較して、FcγRIIaに対する結合活性が維持あるいは減少し、かつFcγRIIbに対する結合活性が増強するように、当該ポリペプチドをコードする核酸を改変する工程、
(b)宿主細胞に当該核酸を導入し発現するように培養する工程、
(c)宿主細胞培養物から当該ポリペプチドを回収する工程、を含む方法である。
さらに当該製造方法によって製造される抗体及びFc融合タンパク質分子も本発明に含まれる。
また本発明は、抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、生体に投与された場合に、親ポリペプチドと比較して、該ポリペプチドに対する抗体の産生が抑制されたポリペプチドの製造方法を提供する。
例えば以下の工程を含む製造方法を挙げることができる;
(a)抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加える工程、および
(b)前記工程(a)で改変されたポリペプチドが生体に投与された場合に、親ポリペプチドと比較して、抗体の産生が抑制されることを確認する工程。
該ポリペプチドに対する抗体の産生が抑制されたかどうかは、動物に実際に該ポリペプチドを投与するなどの方法により確認することができる。あるいは、FcγRIIaに対する結合活性およびFcγRIIbに対する結合活性を測定し、FcγRIIaに対するKD値をFcγRIIbに対するKD値で割った値が増加することをもって、抗体の産生が抑制されたと判断することもできる。そのようなポリペプチドは、活性型FcγRを活性化することなく、抗体の産生を抑制することができるため、医薬品として有用であると考えられる。
上記製造方法における好ましい態様としては、例えばヒトIgGのFc領域を含むポリペプチドにおいてEUナンバリング238番目のProがAspに置換またはEUナンバリング328番目のLeuがGluに置換されるように当該ポリペプチドを改変する。別の好ましい態様としては、EUナンバリング238番目のProのAspへの置換に加えて、さらにEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換が行われるように当該ポリペプチドを改変する。
また本発明は、生体に投与された場合に、親ポリペプチドと比較して、抗体の産生が抑制されたポリペプチドを作製するための、ポリペプチドを改変する方法を提供する。
好ましい態様としては、例えばヒトIgGのFc領域を含むポリペプチドにおいてEUナンバリング238番目のProがAspに置換またはEUナンバリング328番目のLeuがGluに置換されるように当該ポリペプチドを改変する。別の好ましい態様としては、EUナンバリング238番目のProのAspへの置換に加えて、さらにEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換が行われるように当該ポリペプチドを改変する。
また本発明は、抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、生体に投与された場合に、親ポリペプチドと比較して、該ポリペプチドに対する抗体の産生を抑制する方法を提供する。
上記のいずれかの方法により製造されたポリペプチドも本発明に含まれる。
本発明は、本発明のポリペプチドを含有する医薬組成物を提供する。
本発明の医薬組成物は、本発明の上記抗体又はFc融合タンパク質分子に加えて医薬的に許容し得る担体を導入し、公知の方法で製剤化することが可能である。例えば、水もしくはそれ以外の薬学的に許容し得る液との無菌性溶液、又は懸濁液剤の注射剤の形で非経口的に使用できる。例えば、薬理学上許容される担体もしくは媒体、具体的には、滅菌水や生理食塩水、植物油、乳化剤、懸濁剤、界面活性剤、安定剤、香味剤、賦形剤、ベヒクル、防腐剤、結合剤などと適宜組み合わせて、一般に認められた製薬実施に要求される単位用量形態で混和することによって製剤化することが考えられる。具体的には、軽質無水ケイ酸、乳糖、結晶セルロース、マンニトール、デンプン、カルメロースカルシウム、カルメロースナトリウム、ヒドロキシプロピルセルロース、ヒドロキシプロピルメチルセルロース、ポリビニルアセタールジエチルアミノアセテート、ポリビニルピロリドン、ゼラチン、中鎖脂肪酸トリグリセライド、ポリオキシエチレン硬化ヒマシ油60、白糖、カルボキシメチルセルロース、コーンスターチ、無機塩類等を担体として挙げることができる。これら製剤における有効成分量は指示された範囲の適当な用量が得られるようにするものである。
注射のための無菌組成物は注射用蒸留水のようなベヒクルを用いて通常の製剤実施に従って処方することができる。
アラニン:Ala:A
アルギニン:Arg:R
アスパラギン:Asn:N
アスパラギン酸:Asp:D
システイン:Cys:C
グルタミン:Gln:Q
グルタミン酸:Glu:E
グリシン:Gly:G
ヒスチジン:His:H
イソロイシン:Ile:I
ロイシン:Leu:L
リジン:Lys:K
メチオニン:Met:M
フェニルアラニン:Phe:F
プロリン:Pro:P
セリン:Ser:S
スレオニン:Thr:T
トリプトファン:Trp:W
チロシン:Tyr:Y
バリン:Val:V
IgG1と比較して、活性型FcγR、特にFcγRIIaのH型およびR型のいずれの遺伝子多型に対してもFcを介した結合が減少し、かつFcγRIIbに対する結合が増強した抗体を作製するために、IgG1抗体に変異を導入し、各FcγRに対する結合の網羅的解析を実施した。
それぞれのFcγRとの相互作用解析結果について、以下の方法に従って図を作製した。各B3 variantに由来する抗体のFcγRに対する結合量の値を、B3に変異を導入していない比較対象となる抗体(EUナンバリングで234番目から239番目、265番目から271番目、295番目、296番目、298番目、300番目、324番目から337番目がヒト天然型IgG1の配列を有する抗体)のFcγRに対する結合量の値で割った。その値を更に100倍した値を、各変異体のFcγRに対する相対的な結合活性の指標とした。横軸に各変異体のFcγRIIbに対する相対的な結合活性の値、縦軸に各変異体の活性型FcγRであるFcγRIa、FcγRIIa H型、FcγRIIa R型、FcγRIIIaに対する相対的な結合活性の値をそれぞれ表示した(図1、2、3、4)。
実施例1で見出したEUナンバリング238番目のProをAspに置換した改変について各FcγRに対する結合をより詳細に解析した。
1:1結合モデルで相互作用する分子のBiacore上での挙動は以下の式1によって表わすことができる。
C: concentration
RI:bulk refractive index contribution in the sample
Rmax:analyte binding capacity of the surface
〔式2〕
の式に代入して、IgG1-v1、IgG1-v2のFcγRIIa H型およびFcγRIIIaに対するKDを算出した。
このような性質を持つ改変はこれまでに報告が無く、実際に図1、2、3、4に示すように極めて希有である。EUナンバリング238番目のProをAspに置換した改変やEUナンバリング328番目のLeuをGluに置換した改変は免疫炎症性疾患等の治療薬の開発に極めて有用である。
実施例1および実施例2で見出したFcγRIIbに対する選択性が向上されたEUナンバリング238番目のProをAspに置換した改変体を元にしてFcγRIIbに対する選択性を更に増強することを試みた。
まず、IL6R-G1dにEUナンバリング238番目のProをAspに置換した改変を導入したIL6R-G1d_v1(配列番号:21)に対して、実施例2に記載したFcγRIIbに対する選択性を増強するEUナンバリング328番目のLeuのGluへの置換を導入した改変体IL6R-G1d-v4(配列番号:25)を作製し、IL6R-L (配列番号:22)と合わせて、参考例1の方法にしたがって調製した。ここで得られた抗体H鎖としてIL6R-G1d-v4に由来するアミノ酸配列を有する抗体をIgG1-v4とする。IgG1、IgG1-v1、IgG1-v2、IgG1-v4のFcγRIIbに対する結合活性を参考例2の方法にしたがって評価し、その結果を表4に示した。
P238D改変体に対して、実施例2でFcγRIIbに対する増強効果のあったS267E/L328Fを導入して、改変導入前後でのFcγRIIbに対する結合活性を評価し、その結果を表5に示した。
実施例3で示したように、ヒト天然型IgG1に対してEUナンバリング238番目のProをAspに置換したFcに対し、さらにFcγRIIbへの結合を上げると予測される他の改変を組み合わせても、期待される組み合わせ効果は得られなかった。そこで、EUナンバリング238番目のProをAspに置換した改変Fcを元にして、そのFcに対して改変を網羅的に導入することにより、さらにFcγRIIbへの結合を増強する改変体を見出す検討を実施した。抗体H鎖としては、IL6R-G1d(配列番号:20)に対し、EUナンバリング252番目のMetをTyrに置換する改変、EUナンバリング434番目のAsnをTyrに置換する改変を導入したIL6R-F11(配列番号:27)を作製し、これに対してさらにEUナンバリング238番目のProをAspに置換する改変を導入したIL6R-F652(配列番号:28)を作製した。IL6R-F652に対し、EUナンバリング238番目の残基の近傍の領域(EUナンバリング234番目から237番目、239番目)を元のアミノ酸とシステインを除く18種類のアミノ酸にそれぞれ置換した抗体H鎖配列を含む発現プラスミドをそれぞれ用意した。抗体L鎖にはIL6R-L(配列番号:22)を共通して用いた。これらの改変体を参考例1の方法により発現、精製し、発現させた。これらのFc変異体をPD variantと呼ぶ。参考例2の方法により各PD variantのFcγRIIa R型およびFcγRIIbに対する相互作用を網羅的に評価した。
表6に示した改変体のFcγRIa, FcγRIIaR, FcγRIIaH, FcγRIIb, FcγRIIIaVに対するKD値を参考例2の方法で測定した結果を表7にまとめた。なお、表中の配列番号は評価した改変体のH鎖の配列番号を、また、改変とはIL6R-F11(配列番号:27)に対して導入した改変を表す。ただし、IL6R-F11を作製する際の鋳型としたIL6R-G1d/IL6R-Lについては、*として示した。また、表中のKD(IIaR)/KD(IIb)およびKD(IIaH)/KD(IIb)はそれぞれ、各改変体のFcγRIIaRに対するKD値を各改変体のFcγRIIbに対するKD値で割った値、各改変体のFcγRIIaHに対するKD値を各改変体のFcγRIIbに対するKD値で割った値を示す。親ポリペプチドのKD(IIb)/改変ポリペプチドのKD(IIb)は、親ポリペプチドのFcγRIIbに対するKD値を各改変体のFcγRIIbに対するKD値で割った値を指す。これらに加えて、各改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値/親ポリペプチドのFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値を表7に示した。ここで親ポリペプチドとは、IL6R-F11(配列番号:27)をH鎖に持つ改変体のことを指す。なお、表7中灰色で塗りつぶしたセルは、FcγRのIgGに対する結合が微弱であり、速度論的な解析では正しく解析できないと判断されたため、参考例2に記載の
〔式2〕
の式を利用して算出した値である。
表7から、いずれの改変体もIL6R-F11と比較してFcγRIIbに対する親和性が向上し、その向上の幅は1.9倍から5.0倍であった。各改変体のFcγRIIaRに対するKD値/各改変体のFcγRIIbに対するKD値の比、および各改変体のFcγRIIaHに対するKD値/各改変体のFcγRIIbに対するKD値の比は、FcγRIIaRおよびFcγRIIaHに対する結合活性に対する相対的なFcγRIIbに対する結合活性を表す。つまり、この値は各改変体のFcγRIIbへの結合選択性の高さを示した値であり、この値が大きければ大きいほどFcγRIIbに対して結合選択性が高い。親ポリペプチドであるIL6R-F11/IL6R-LのFcγRIIaRに対するKD値/FcγRIIbに対するKD値の比、およびFcγRIIaHに対するKD値/FcγRIIbに対するKD値の比はいずれも0.7であるため、表7のいずれの改変体も親ポリペプチドよりもFcγRIIbへの結合選択性が向上していた。改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値/親ポリペプチドのFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値が1以上であるとは、その改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合が親ポリペプチドのFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合と同等であるか、より低減していることを意味する。今回得られた改変体ではこの値が0.7から5.0であったため、今回得られた改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合は親ポリペプチドのそれと比較してほぼ同等か、それよりも低減していたと言える。これらの結果から、今回得られた改変体では親ポリペプチドと比べて、FcγRIIa R型およびH型への結合活性を維持または低減しつつ、FcγRIIbへの結合活性を増強しており、FcγRIIbへの選択性を向上させていることが明らかとなった。また、FcγRIaおよびFcγRIIIaVに対しては、いずれの改変体もIL6R-F11と比較して親和性が低下していた。
先の実施例3に示した通り、P238Dを含むFcに対して、FcγRIIbとの結合活性を向上する、あるいはFcγRIIbへの選択性を向上させる改変を導入しても、FcγRIIbに対する結合活性が減弱してしまうことが明らかとなり、この原因としてFcとFcγRIIbとの相互作用界面の構造がP238Dを導入することで変化してしまっていることが考えられた。そこで、この現象の原因を追及するためP238Dの変異をもつIgG1のFc(以下、Fc(P238D))とFcγRIIb細胞外領域との複合体の立体構造をX線結晶構造解析により明らかにし、天然型 IgG1のFc (以下、Fc(WT)) とFcγRIIb細胞外領域との複合体と立体構造ならびに結合様式を比較することとした。なお、FcとFcγR細胞外領域との複合体の立体構造については、すでに複数の報告があり、Fc(WT) / FcγRIIIb細胞外領域複合体(Nature, 2000, 400, 267-273; J.Biol.Chem. 2011, 276, 16469-16477)、Fc(WT) / FcγRIIIa細胞外領域複合体(Proc.Natl.Acad.Sci.USA, 2011, 108, 12669-126674)、Fc(WT) / FcγRIIa細胞外領域複合体(J. Imunol. 2011, 187, 3208-3217)の立体構造が解析されている。これまでにFc(WT) / FcγRIIb細胞外領域複合体の立体構造は解析されていないが、Fc(WT)との複合体の立体構造が既知であるFcγRIIaとFcγRIIbでは細胞外領域においてアミノ酸配列の93%が一致し、非常に高い相同性を有していることから、Fc (WT) / FcγRIIb細胞外領域複合体の立体構造はFc(WT) / FcγRIIa細胞外領域複合体の結晶構造からモデリングにより推定した。
次に詳細な比較のため、Fc(P238D) / FcγRIIb細胞外領域複合体の結晶構造とFc(WT) / FcγRIIb細胞外領域複合体のモデル構造とを、FcγRIIb細胞外領域ならびにFc CH2ドメインAに対しCα原子間距離をもとにした最小二乗法により重ね合わせた(図9)。その際、Fc CH2ドメインB同士の重なりの程度は良好でなく、この部分に立体構造的な違いがあることが明らかとなった。さらにFc(P238D) / FcγRIIb細胞外領域複合体の結晶構造ならびにFc(WT) / FcγRIIb細胞外領域複合体のモデル構造を使い、FcγRIIb細胞外領域とFc CH2ドメインBとの間でその距離が3.7Å以下の原子ペアを抽出し比較することで、FcγRIIbとFc CH2ドメインBとの間の原子間相互作用の違いをFc(WT)とFc(P238D)とで比較した。表8に示すとおり、Fc(P238D)とFc(WT)では、Fc CH2ドメインBとFcγRIIbとの間の原子間相互作用は一致していない。
P238D改変を含むFcの調製は以下のように行った。まず、hIL6R-IgG1-v1(配列番号:21)のEUナンバリング220番目のCysをSerに置換し、EUナンバリング236番目のGluからそのC末端をPCRによってクローニングした遺伝子配列Fc(P238D)を参考例1に記載の方法にしたがって発現ベクターの作製、発現、精製を行った。なお、EUナンバリング220番目のCysは通常のIgG1においては、L鎖のCysとdisulfide bondを形成しているが、Fcのみを調製する場合、L鎖を共発現させないため、不要なdisulfide bond形成を回避するためにSerに置換した。
参考例2の方法にしたがって調製した。
結晶化用に得られたFcγRIIb細胞外領域サンプル 2mgに対し、glutathione S-transferaseとの融合蛋白として大腸菌により発現精製したEndo F1(Protein Science 1996, 5, 2617-2622) 0.29mgを加え、0.1M Bis-Tris pH6.5のBuffer条件で、室温にて3日間静置することにより、N型糖鎖をAsnに直接結合したN-acetylglucosamineを残して切断した。次にこの糖鎖切断処理を施したFcγRIIb細胞外領域サンプルを5000MWCOの限外ろ過膜により濃縮し、20mM HEPS pH7.5, 0.05M NaClで平衡化したゲルろ過カラムクロマトグラフィー(Superdex200 10/300)により精製した。さらに得られた糖鎖切断FcγRIIb細胞外領域画分にFc(P238D)をモル比でFcγRIIb細胞外領域のほうが若干過剰となるよう加え、10000MWCOの限外ろ過膜により濃縮後、20mM HEPS pH7.5, 0.05M NaClで平衡化したゲルろ過カラムクロマトグラフィー(Superdex200 10/300)により精製、Fc(P238D) / FcγRIIb細胞外領域複合体のサンプルを得た。
Fc(P238D) / FcγRIIb細胞外領域複合体のサンプルを10000MWCOの限外ろ過膜 により約10mg/mlまで濃縮し、シッティングドロップ蒸気拡散法により結晶化をおこなった。結晶化にはHydra II Plus One (MATRIX)を用い、100mM Bis-Tris pH6.5、17% PEG3350, 0.2M Ammonium acetate, 2.7%(w/v) D-Galactoseのリザーバー溶液に対し、リザーバー溶液:結晶化サンプル=0.2μl:0.2μlで混合して結晶化ドロップを作成し、シール後、20℃に静置したところ、薄い板状の結晶を得ることに成功した。
得られたFc(P238D) / FcγRIIb細胞外領域複合体の単結晶一つを100mM Bis-Tris pH6.5, 20% PEG3350, Ammonium acetate, 2.7%(w/v) D-Galactose, Ethylene glycol 22.5%(v/v) の溶液に浸した後、微小なナイロンループ付きのピンで溶液ごとすくいとり、液体窒素中で凍結させ、高エネルギー加速器研究機構の放射光施設フォトンファクトリーBL-1AにてX線回折データの測定をおこなった。なお、測定中は常に-178℃の窒素気流中に置くことで凍結状態を維持し、ビームライン備え付けのCCDディテクタQuantum 270(ADSC)により、結晶を0.8°ずつ回転させながらトータル225枚のX線回折画像を収集した。得られた回折画像からの格子定数の決定、回折斑点の指数付け、ならびに回折データの処理には、プログラムXia2(CCP4 Software Suite)、XDS Package(Walfgang Kabsch)ならびにScala(CCP4 Software Suite)を用い、最終的に分解能2.46Åまでの回折強度データを得た。本結晶は、空間群P21に属し、格子定数a=48.85Å、b=76.01Å、c=115.09Å、α=90°、β=100.70°、γ=90°であった。
Fc(P238D) / FcγRIIb細胞外領域複合体の結晶構造決定は、プログラムPhaser(CCP4 Software Suite)を用いた分子置換法によりおこなった。得られた結晶格子の大きさとFc(P238D) / FcγRIIb細胞外領域複合体の分子量から非対称単位中の複合体の数は一個と予想された。Fc(WT) / FcγRIIIa細胞外領域複合体の結晶構造であるPDB code:3SGJの構造座標から、A鎖239-340番ならびにB鎖239-340番のアミノ酸残基部分を別座標として取り出し、それぞれFc CH2ドメインの探索用モデルとした。同じくPDB code:3SGJの構造座標から、A鎖341-444番とB鎖341-443番のアミノ酸残基部分を一つの座標として取り出し、Fc CH3ドメインの探索用モデルとした。最後にFcγRIIb細胞外領域の結晶構造であるPDB code:2FCBの構造座標からA鎖6-178番のアミノ酸残基部分を取り出しFcγRIIb細胞外領域の探索用モデルとした。Fc CH3ドメイン、FcγRIIb細胞外領域、Fc CH2ドメインの順番に各探索用モデルの結晶格子内での向きと位置を、回転関数および並進関数から決定し、Fc(P238D) / FcγRIIb細胞外領域複合体結晶構造の初期モデルを得た。得られた初期モデルに対し2つのFc CH2ドメイン、2つのFc CH3ドメインならびにFcγRIIb細胞外領域を動かす剛体精密化をおこなったところ、この時点で25-3.0Åの回折強度データに対し、結晶学的信頼度因子R値は40.4%、Free R値は41.9%となった。さらにプログラムRefmac5(CCP4 Software Suite)を用いた構造精密化と、実験的に決定された構造因子Foとモデルから計算された構造因子Fcならびにモデルから計算された位相をもとに算出した2Fo-Fc、Fo-Fcを係数とする電子密度マップを見ながらのモデル修正をプログラムCoot(Paul Emsley)でおこない、これらを繰り返すことでモデルの精密化をおこなった。最後に2Fo-Fc、Fo-Fcを係数とする電子密度マップをもとに水分子をモデルに組み込み、精密化をおこなうことで、最終的に分解能25-2.6Åの24291個の回折強度データを用い、4846個の非水素原子を含むモデルに対し、結晶学的信頼度因子R値は23.7%、Free R値は27.6%となった。
Fc(WT) / FcγRIIa細胞外領域複合体の結晶構造であるPDB code:3RY6の構造座標をベースに、プログラムDisovery Studio 3.1(Accelrys)のBuild Mutants機能を使い、FcγRIIbのアミノ酸配列と一致するように構造座標中のFcγRIIaに変異を導入した。その際、Optimization LevelをHigh、Cut Radiusを4.5とし、5つのモデルを発生させ、その中から最もエネルギースコアが良いものを採用し、Fc(WT) / FcγRIIb細胞外領域複合体のモデル構造とした。
実施例5で得られたFc (P238D)とFcγRIIb細胞外領域との複合体のX線結晶構造解析の結果に基づき、EUナンバリング238番目のProをAspに置換した改変Fc上で、FcγRIIbとの相互作用に影響を与えることが予測される部位(EUナンバリング233番目、240番目、241番目、263番目、265番目、266番目、267番目、268番目、271番目、273番目、295番目、296番目、298番目、300番目、323番目、325番目、326番目、327番目、328番目、330番目、332番目、334番目の残基)に対して網羅的な改変を導入し、さらにFcγRIIbとの結合を増強する組み合わせ改変体を検討した。
その結果、図13に示すように、全改変中24種類の改変において、改変導入前の抗体と比較してFcγRIIbに対する結合を維持または増強する効果があることを見出した。これらの改変体のそれぞれのFcγRに対する結合を表9に示す。なお、表中の配列番号は評価した改変体のH鎖の配列番号を、また、改変とはIL6R-B3(配列番号:40)に対して導入した改変を表す。ただし、IL6R-B3を作製する際の鋳型としたIL6R-G1d/IL6R-Lについては、*として示した。
〔式2〕
の式を利用して算出した値である。
表10から、いずれの改変体もIL6R-B3と比較してFcγRIIbに対する親和性が向上し、その向上の幅は2.1倍から9.7倍であった。各改変体のFcγRIIaRに対するKD値/各改変体のFcγRIIbに対するKD値の比、および各改変体のFcγRIIaHに対するKD値/各改変体のFcγRIIbに対するKD値の比は、FcγRIIaRおよびFcγRIIaHに対する結合活性に対する相対的なFcγRIIbに対する結合活性を表す。つまり、この値は各改変体のFcγRIIbへの結合選択性の高さを示した値であり、この値が大きければ大きいほどFcγRIIbに対して結合選択性が高い。親ポリペプチドであるIL6R-B3/IL6R-LのFcγRIIaRに対するKD値/FcγRIIbに対するKD値の比、およびFcγRIIaHに対するKD値/FcγRIIbに対するKD値の比はそれぞれ0.3、0.2であるため、表10のいずれの改変体も親ポリペプチドよりもFcγRIIbへの結合選択性が向上していた。改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値/親ポリペプチドのFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値が1以上であるとは、その改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合が親ポリペプチドのFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合と同等であるか、より低減していることを意味する。今回得られた改変体ではこの値が4.6から34.0であったため、今回得られた改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合は親ポリペプチドのそれよりも低減していたと言える。これらの結果から、今回得られた改変体では親ポリペプチドと比べて、FcγRIIa R型およびH型への結合活性を維持または低減しつつ、FcγRIIbへの結合活性を増強しており、FcγRIIbへの選択性を向上させていることが明らかとなった。また、FcγRIaおよびFcγRIIIaVに対しては、いずれの改変体もIL6R-B3と比較して親和性が低下していた。
実施例4、実施例6において得られた改変の中で、FcγRIIbへの結合を増強する効果もしくはFcγRIIbへの結合を維持し、他のFcγRへの結合を抑制する効果が見られた改変同士を組み合わせ、その効果を検証した。
実施例6の方法と同様に、表6, 9から特に優れた改変を選択し、抗体H鎖IL6R-BF648に対して組み合わせて導入した。抗体L鎖には共通してIL6R-Lを用い、参考例1の方法に従い、抗体を発現、精製させ、参考例2の方法により各FcγR(FcγRIa、 FcγRIIa H型、FcγRIIa R型、FcγRIIb、FcγRIIIa V型)に対する結合を網羅的に評価した。
それぞれのFcγRとの相互作用解析結果について、以下の方法に従って相対的結合活性を算出した。各改変体の各FcγRに対する結合量の値を、コントロールとした改変導入前の抗体(EUナンバリング238番目のProをAspに置換したIL6R-BF648/IL6R-L)の各FcγRに対する結合量の値で割り、さらに100倍した値を各改変体の各FcγRに対する相対的な結合活性の値とした。横軸に各改変体のFcγRIIbに対する相対的な結合活性の値、縦軸に各改変体のFcγRIIa R型に対する相対的な結合活性の値をそれぞれ表示した(表11)。
なお、表中の配列番号は評価した改変体のH鎖の配列番号を、また、改変とはIL6R-B3(配列番号:40)に対して導入した改変を表す。ただし、IL6R-B3を作製する際の鋳型としたIL6R-G1d/IL6R-Lについては、*として示した。
〔式2〕
の式を利用して算出した値である。
表12から、いずれの改変体もIL6R-B3と比較してFcγRIIbに対する親和性が向上し、その向上の幅は3.0倍から99.0倍であった。各改変体のFcγRIIaRに対するKD値/各改変体のFcγRIIbに対するKD値の比、および各改変体のFcγRIIaHに対するKD値/各改変体のFcγRIIbに対するKD値の比は、FcγRIIaRおよびFcγRIIaHに対する結合活性に対する相対的なFcγRIIbに対する結合活性を表す。つまり、この値は各改変体のFcγRIIbへの結合選択性の高さを示した値であり、この値が大きければ大きいほどFcγRIIbに対して結合選択性が高い。親ポリペプチドであるIL6R-B3/IL6R-LのFcγRIIaRに対するKD値/FcγRIIbに対するKD値の比、およびFcγRIIaHに対するKD値/FcγRIIbに対するKD値の比はそれぞれ0.3、0.2であるため、表12のいずれの改変体も親ポリペプチドよりもFcγRIIbへの結合選択性が向上していた。改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値/親ポリペプチドのFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方のKD値が1以上であるとは、その改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合が親ポリペプチドのFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合と同等であるか、より低減していることを意味する。今回得られた改変体ではこの値が0.7から29.9であったため、今回得られた改変体のFcγRIIaRおよびFcγRIIaHに対する結合活性のうち強い方の結合は親ポリペプチドのそれと比較してほぼ同等か、それよりも低減していたと言える。これらの結果から、今回得られた改変体では親ポリペプチドと比べて、FcγRIIa R型およびH型への結合活性を維持または低減しつつ、FcγRIIbへの結合活性を増強しており、FcγRIIbへの選択性を向上させていることが明らかとなった。また、FcγRIaおよびFcγRIIIaVに対しては、いずれの改変体もIL6R-B3と比較して親和性が低下していた。
抗体の可変領域のH鎖およびL鎖の塩基配列をコードする全長の遺伝子の合成は、Assemble PCR等を用いて、当業者公知の方法で作製した。アミノ酸置換の導入はPCR等を用いて当業者公知の方法で行った。得られたプラスミド断片を動物細胞発現ベクターに挿入し、H鎖発現ベクターおよびL鎖発現ベクターを作製した。得られた発現ベクターの塩基配列は当業者公知の方法で決定した。作製したプラスミドをヒト胎児腎癌細胞由来HEK293H株(Invitrogen社)、またはFreeStyle293細胞(Invitrogen社)に、一過性に導入し、抗体の発現を行った。得られた培養上清を回収した後、0.22μmフィルターMILLEX(R)-GV(Millipore)、または0.45μmフィルターMILLEX(R)-GV(Millipore)を通して培養上清を得た。得られた培養上清から、rProtein A Sepharose Fast Flow(GEヘルスケア)またはProtein G Sepharose 4 Fast Flow(GEヘルスケア)を用いて当業者公知の方法で、抗体を精製した。精製抗体濃度は、分光光度計を用いて280 nmでの吸光度を測定し、得られた値からPACE等の方法により算出された吸光係数を用いて抗体濃度を算出した(Protein Science 1995 ; 4 : 2411-2423)。
FcγRの細胞外ドメインを以下の方法で調製した。まずFcγRの細胞外ドメインの遺伝子の合成を当業者公知の方法で実施した。その際、各FcγRの配列はNCBIに登録されている情報に基づき作製した。具体的には、FcγRIについてはNCBIのアクセッション番号NM_000566.3の配列、FcγRIIaについてはNCBIのアクセッション番号NM_001136219.1の配列、FcγRIIbについてはNCBIのアクセッション番号NM_004001.3の配列、FcγRIIIaについてはNCBIのアクセッション番号NM_001127593.1の配列、FcγRIIIbについてはNCBIのアクセッション番号NM_000570.3の配列に基づいて作製し、C末端にHisタグを付加した。またFcγRIIa、FcγRIIIa、FcγRIIIbについては多型が知られているが、多型部位についてはFcγRIIaについてはJ. Exp. Med., 1990, 172: 19-25、FcγRIIIaについてはJ. Clin. Invest., 1997, 100 (5): 1059-1070, FcγRIIIbについてはJ. Clin. Invest., 1989, 84, 1688-1691を参考にして作製した。
1:1 binding modelで相互作用する分子のBiacore上での挙動は以下の式1によって表わすことができる。
〔式1〕
Req:a plot of steady state binding levels against analyte concentration
C: concentration
RI:bulk refractive index contribution in the sample
Rmax:analyte binding capacity of the surface
この式を変形すると、KDは以下の式2のように表わすことができる。
〔式2〕
この式にRmax、RI、Cの値を代入することで、KDを算出することが可能である。RI、Cについては測定結果のセンサーグラム、測定条件から値を求めることができる。Rmaxの算出については、以下の方法にしたがった。その測定回に同時に評価した比較対象となる相互作用が十分強い抗体について、上記の1:1 Langmuir binding modelでglobal fittingさせた際に得られたRmaxの値を、比較対象となる抗体のセンサーチップへのキャプチャー量で除し、評価したい改変抗体のキャプチャー量で乗じて得られた値をRmaxとした。
Claims (27)
- 少なくとも一つのアミノ酸が改変された抗体Fc領域を含むポリペプチド変異体であって、親ポリペプチドと比較して、FcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性が維持あるいは減少し、FcγRIIbに対する結合活性が増強し、かつ〔ポリペプチド変異体のFcγRIIa(R型)に対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕の値が1.2以上であるポリペプチド。
- 〔ポリペプチド変異体のFcγRIIa(H型)に対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕の値が4.2以上である、請求項1に記載のポリペプチド。
- 〔親ポリペプチドのFcγRIIbに対するKD値〕/〔ポリペプチド変異体のFcγRIIbに対するKD値〕の値が1.6以上である、請求項1または2に記載のポリペプチド。
- 〔ポリペプチド変異体のFcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性のうち強い方のKD値〕/〔親ポリペプチドのFcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性のうち強い方のKD値〕の値が0.7以上である、請求項1から3のいずれか一項に記載のポリペプチド。
- 親ポリペプチドと比較して、FcγRIIIaに対する結合活性が維持あるいは減少した、請求項1から4のいずれか一項に記載のポリペプチド。
- 親ポリペプチドと比較して、FcγRIaに対する結合活性が維持あるいは減少した、請求項1から5のいずれか一項に記載のポリペプチド。
- アミノ酸改変が、EUナンバリング238番目のProのAspへの置換又はEUナンバリング328番目のLeuのGluへの置換である、請求項1から6のいずれか一項に記載のポリペプチド。
- アミノ酸改変が、EUナンバリング238番目のProのAspへの置換、およびEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換である、請求項1から7のいずれか一項に記載のポリペプチド。
- 前記抗体Fc領域を含むポリペプチドがIgG抗体である、請求項1から8のいずれか一項に記載のポリペプチド。
- 前記抗体Fc領域を含むポリペプチドがFc融合タンパク質分子である、請求項1から8のいずれか一項に記載のポリペプチド。
- 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、親ポリペプチドと比較して、FcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性を維持あるいは減少し、かつFcγRIIbに対する結合活性を増強する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
- 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、生体に投与された場合に、親ポリペプチドと比較して、該ポリペプチドに対する抗体の産生を抑制する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
- アミノ酸改変が、EUナンバリング238番目のProのAspへの置換、およびEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換である、請求項11または12に記載の方法。
- 前記抗体Fc領域を含むポリペプチドがIgG抗体である、請求項11から13のいずれか一項に記載の方法。
- 前記抗体Fc領域を含むポリペプチドがFc融合タンパク質分子である、請求項11から13のいずれか一項に記載の方法。
- 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、親ポリペプチドと比較して、FcγRIIa(R型)およびFcγRIIa(H型)に対する結合活性が維持あるいは減少され、かつFcγRIIbに対する結合活性が増強されたポリペプチドを製造する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
- 抗体Fc領域を含むポリペプチドにおいて、該Fc領域に少なくとも一つのアミノ酸改変を加えることを含む、生体に投与された場合に、親ポリペプチドと比較して、該ポリペプチドに対する抗体の産生が抑制されたポリペプチドを製造する方法であって、該アミノ酸改変がEUナンバリング238番目のProのAspへの置換、又はEUナンバリング328番目のLeuのGluへの置換である方法。
- アミノ酸改変が、EUナンバリング238番目のProのAspへの置換、およびEUナンバリング237番目のGlyのTrpへの置換、EUナンバリング237番目のGlyのPheへの置換、EUナンバリング267番目のSerのValへの置換、EUナンバリング267番目のSerのGlnへの置換、EUナンバリング268番目のHisのAsnへの置換、EUナンバリング271番目のProのGlyへの置換、EUナンバリング326番目のLysのLeuへの置換、EUナンバリング326番目のLysのGlnへの置換、EUナンバリング326番目のLysのGluへの置換、EUナンバリング326番目のLysのMetへの置換、EUナンバリング239番目のSerのAspへの置換、EUナンバリング267番目のSerのAlaへの置換、EUナンバリング234番目のLeuのTrpへの置換、EUナンバリング234番目のLeuのTyrへの置換、EUナンバリング237番目のGlyのAlaへの置換、EUナンバリング237番目のGlyのAspへの置換、EUナンバリング237番目のGlyのGluへの置換、EUナンバリング237番目のGlyのLeuへの置換、EUナンバリング237番目のGlyのMetへの置換、EUナンバリング237番目のGlyのTyrへの置換、EUナンバリング330番目のAlaのLysへの置換、EUナンバリング330番目のAlaのArgへの置換、EUナンバリング233番目のGluのAspへの置換、EUナンバリング268番目のHisのAspへの置換、EUナンバリング268番目のHisのGluへの置換、EUナンバリング326番目のLysのAspへの置換、EUナンバリング326番目のLysのSerへの置換、EUナンバリング326番目のLysのThrへの置換、EUナンバリング323番目のValのIleへの置換、EUナンバリング323番目のValのLeuへの置換、EUナンバリング323番目のValのMetへの置換、EUナンバリング296番目のTyrのAspへの置換、EUナンバリング326番目のLysのAlaへの置換、EUナンバリング326番目のLysのAsnへの置換、EUナンバリング330番目のAlaのMetへの置換のグループから選択される少なくとも一つの置換である、請求項16または17に記載の方法。
- 前記抗体Fc領域を含むポリペプチドがIgG抗体である、請求項16から18のいずれか一項に記載の方法。
- 前記抗体Fc領域を含むポリペプチドがFc融合タンパク質分子である、請求項16から18のいずれか一項に記載の方法。
- 請求項16から20のいずれか一項に記載の方法により製造されたポリペプチド。
- 請求項1から10、21のいずれか一項に記載のポリペプチドを含有する医薬組成物。
- 請求項1から10、21のいずれか一項に記載のポリペプチドを含有するB細胞、マスト細胞、樹状細胞および/または好塩基球の活性化抑制剤。
- 請求項1から10、21のいずれか一項に記載のポリペプチドを含有する免疫炎症性疾患の治療剤又は予防剤。
- 免疫炎症性疾患が自己免疫疾患であって、自己抗原に対する抗体の産生が原因と考えられる疾患である、請求項24に記載の治療剤又は予防剤。
- 請求項1から10、21のいずれか一項に記載のポリペプチドを含有する疾患治療剤であって、該疾患が生体に必要なタンパク質を欠損する疾患である治療剤。
- 請求項1から10、21のいずれか一項に記載のポリペプチドを含有する抗ウィルス剤。
Priority Applications (114)
Application Number | Priority Date | Filing Date | Title |
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AU2012222252A AU2012222252B2 (en) | 2011-02-25 | 2012-02-24 | FcgammaRIIb-specific Fc antibody |
KR1020207023693A KR20200103845A (ko) | 2011-02-25 | 2012-02-24 | FcγRIIb 특이적 Fc 항체 |
KR1020137024252A KR102147548B1 (ko) | 2011-02-25 | 2012-02-24 | FcγRIIb 특이적 Fc 항체 |
MX2013009774A MX352889B (es) | 2011-02-25 | 2012-02-24 | Anticuerpo de fc especifico para fcyriib. |
SG2013064340A SG192945A1 (en) | 2011-02-25 | 2012-02-24 | Fcgriib-specific fc antibody |
EP12749420.1A EP2679681B2 (en) | 2011-02-25 | 2012-02-24 | FcgammaRIIB-specific FC antibody |
CA2827923A CA2827923C (en) | 2011-02-25 | 2012-02-24 | Fc.gamma.riib-specific fc antibody |
JP2013501147A JP6032818B2 (ja) | 2011-02-25 | 2012-02-24 | FcγRIIb特異的Fc抗体 |
CN201280020170.5A CN103492565B (zh) | 2011-02-25 | 2012-02-24 | FcγRIIb特异性Fc抗体 |
US14/001,218 US20140093496A1 (en) | 2011-02-25 | 2012-02-24 | Fc-gamma-RIIb-SPECIFIC Fc ANTIBODY |
BR112013021526-7A BR112013021526B1 (pt) | 2011-02-25 | 2012-02-24 | Polipeptídio variante, métodos para manter ou diminuir as atividades de ligação a fcgriia (tipo r) e fcgriia (tipo h) e aumentar a atividade de ligação a fcgriib de um polipeptídio e para a supressão da produção de um anticorpo contra um polipeptídio compreendendo a região fc do anticorpo, métodos para a produção do referido polipeptídio com atividades de ligação mantidas ou diminuídas e aumentada e para a produção suprimida de um anticorpo, composição farmacêutica e uso de um polipeptídio |
EP19190090.1A EP3604330A1 (en) | 2011-02-25 | 2012-02-24 | Fcgammariib-specific fc antibody |
RU2013143303A RU2608504C2 (ru) | 2011-02-25 | 2012-02-24 | FcγRIIb-СПЕЦИФИЧНОЕ Fc-АНТИТЕЛО |
KR1020227044264A KR20230005405A (ko) | 2011-02-25 | 2012-02-24 | FcγRIIb 특이적 Fc 항체 |
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