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    • 专利摘要:
    ANTI-N3PGLU BETA-AMYLOID PEPTIDE ANTIBODIES AND THEIR USES. The present invention provides anti-N3pGlu A <sym> antibodies or their antigen binding fragment. In addition, the present invention provides the use of anti-N3pGlu A <sym> antibodies or their antigen binding fragment for the treatment of Alzheimer's disease. </sym> </sym>
    公开号:BR112013004056A2
    申请号:R112013004056-4
    申请日:2011-08-09
    公开日:2020-08-04
    发明作者:Jirong Lu；Ying Tang；Ronald Bradlev Demattos
    申请人:Eli Lilly And Company；
    IPC主号:
    专利说明:

    [001] [001] The present invention relates to antibodies that selectively bind the amyloid beta peptide N3pGlu and its use in the treatment of diseases related to the amyloid beta peptide (Aβ, also referred to as Abeta).
    [002] [002] The Aβ peptide in the circulation form is composed of 38-43 amino acids (most of the time 38, 40 or 42 amino acids) resulting from the cleavage of a precursor protein, amyloid precursor protein (APP). The conversion of Aβ from soluble to insoluble forms having a high β leaf content and the deposition of these insoluble forms as neuritic and cerebrovascular plaques in the brain have been associated with a number of conditions and diseases, including Alzheimer's disease (AD ), Down syndrome, and cerebral amyloid angiopathy (CAA).
    [003] [003] The deposits found on the plates are comprised mainly of a heterogeneous mixture of Aβ peptides. Aβ N3pGlu, also referred to as N3pE or Aβ p3-42, is a truncated form of the Aβ peptide found only in the plates. The need for Aβ N3pGlu in the first two amino acid residues at the N terminal of Aβ and has a pyroglutamate that was derived from glutamic acid in the third amino acid position. Although the Aβ N3pGlu peptide is a minor component of Aβ deposited in the brain, studies have shown that the Aβ N3pGlu peptide has aggressive aggregation properties and soon accumulates in the deposition cascade.
    [004] [004] While polyclonal and monoclonal antibodies targeting the Aβ N3pGlu peptide have been previously described (US 7,122,374 and WO 2010/009987), there is still a need for high affinity anti-N3pGlu monoclonal antibodies for employ the target in vivo (i.e., plaque binding) and subsequently lower plaque levels. Furthermore, assuming that the carboxyl terminal and amino terminal anti-Aβ antibodies leading to an increase in cerebral hemorrhage-related amyloid angiopathy (CAA), there is a need for anti-N3pGlu Aβ antibodies that do not result in a an increase in micro-hemorrhage even through chronic treatment results in a significant reduction in the deposited plaque.
    [005] [005] Antibodies within the scope of the present invention are therapeutically useful Aβ peptide N3pGlu antagonists having a number of desirable properties. The present antibodies bind the human peptide Aβ N3pGlu with high affinity and present dose-dependent plaque in vivo in reduction without an increase in cerebral amyloid angiopathy (CAA) related to micro-hemorrhage.
    [006] [006] The present invention provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment that has a Kd of 25oC of less than 1 x 10-9 M for the human Aβ N3pGlu peptide. In a preferred embodiment, the present invention provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment that has a Kd of 25 ° C of less than 9 x 10-10 M for the human Aβ N3pGlu peptide. In another preferred mode, the present invention provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment that has a Kd of 25oC of less than 7 x 10-10 M for the human peptide Aβ N3pGlu. In another preferred embodiment, the present invention provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment that has a Kd of 25 ° C between 9 x 10 -10 M and 1 x 10-10 M for the human Aβ N3pGlu peptide. In another preferred embodiment, the present invention provides an anti-N3pGlu Aβ antibody, or its antigen-binding fragment that has a Kd of 25oC between 9 x 10-10 M and 1 x 10-10 M for the peptide human Aβ N3pGlu.
    [007] [007] The present invention also provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment that has a Kd of 25oC of less than 1 x 10-9 M, or less than 9 x 10-10 M, or less than 7 x 10-10 M, or between 9 x 10-10 M and 1 x 10-10 M for the human peptide Aβ N3pGlu and smaller plaques in vivo. In another preferred embodiment, the present invention provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment that has a Kd of 25oC of less than 1 x 10-9 M, or less than 9 x 10-10 M, or less than 7 x 10-10 M, or between 9 x 10-10 M and 1 x 10-10 M for the human peptide Aβ N3pGlu and minor epidemics in vivo without increasing micro-related CAA bleeding.
    [008] [008] The present invention also provides a human-designed anti-N3pGlu Aβ antibody or its antigen-binding fragment comprising an LCVR and an HCVR where LCDR1 is KSX1X2SLLYSRX3KTYLN (SEQ ID NO: 51), LCDR2 is AVSKLX4S (SEQ ID NO: 52), LCDR3 is VQGTHYPFT (SEQ ID NO: 5) and HCDR1 is GYX5FTX6YYIN (SEQ ID NO: 53), HCDR2 is WINPGSGNTKYNEKFKG (SEQ ID NO: 8), and HCDR3 is EGX7TVY (SEQ ID NO: 54) , where X1 is S or T; X2 is Q or R, X3 is G or S, X4 is D or G, X5 is D or T, X6 is R or D, and X7 is I, T, E, or V.
    [009] [009] The present invention provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment comprising a light chain variable region (LCVR) and a heavy chain variable region (HCVR), in which the said LCVR comprises the polypeptides LCDR1, LCDR2, LCDR3 and HCVR comprises the polypeptides HCDR1, HCDR2, HCDR3 which are selected from the group consisting of:
    [0010] [0010] LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LCDR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYDFTRYYIN (SEQ ID NO: 6), HCDRN is WINS - NEKFKG (SEQ ID NO: 8), and HCDR3 is EGITVY (SEQ ID NO: 9);
    [0011] [0011] LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LCDR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYTFTRYYIN (SEQ ID NO: 7), HCDRN is WINS - NEKFKG (SEQ ID NO: 8), and HCDR3 is EGTTVY (SEQ ID NO: 10);
    [0012] [0012] LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LCDR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYTFTDYYIN (SEQ ID NO: 40), HCDRN is WINS - NEKFKG (SEQ ID NO: 8), and HCDR3 is EGETVY (SEQ ID NO: 41);
    [0013] [0013] LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LCDR2 is AVSKLGS (SEQ ID NO: 35), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYTFTRYYIN (SEQ ID NO: 7), HCDRN is WINPG - NEKFKG (SEQ ID NO: 8), and HCDR3 is EGTTVY (SEQ ID NO: 10); and
    [0014] [0014] LCDR1 is KSTRSLLYSRSKTYLN (SEQ ID NO: 45), LCDR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYTFTDYYIN (SEQ ID NO: 40), HCDR2 is WINPGSGNN - NEKFKG (SEQ ID NO: 8), and HCDR3 is EGVTVY (SEQ ID NO: 46).
    [0015] [0015] In one embodiment, the present invention provides a human-designed anti-N3pGlu Aβ antibody or its antigen binding fragment comprising an LCVR and an HCVR where LCDR1 is SEQ ID NO: 3, LCDR2 is SEQ ID NO: 4, LCDR3 is SEQ ID NO: 5, HCDR1 is SEQ ID NO: 6, HCDR2 is SEQ ID NO: 8, and HC-DR3 is SEQ ID NO: 9. In one embodiment, the present invention provides a human-designed anti-N3pGlu Aβ antibody or its antigen binding fragment comprising an LCVR and an HCVR where LCDR1 is SEQ ID NO: 3, LCDR2 is SEQ ID NO: 4,
    [0016] [0016] In another embodiment, the present invention provides a human-designed anti-N3pGlu Aβ antibody, or its antigen binding fragment comprising a light chain variable region (LCVR) and a heavy chain variable region (HCVR) , in which said LCVR and HCVR are the polypeptides selected from the group consisting of:
    [0017] [0017] LCVR of SEQ ID NO: 11 and HCVR of SEQ ID NO: 12;
    [0018] [0018] LCVR of SEQ ID NO: 11 and HCVR of SEQ ID NO: 13;
    [0019] [0019] LCVR of SEQ ID NO: 11 and HCVR of SEQ ID NO: 42;
    [0020] [0020] LCVR of SEQ ID NO: 36 and HCVR of SEQ ID NO: 37; and
    [0021] [0021] LCVR of SEQ ID NO: 47 and HCVR of SEQ ID NO: 48.
    [0022] [0022] In one embodiment, the present invention provides an anti-
    [0023] [0023] The present invention also provides a monoclonal Aβ anti-N3pGlu antibody comprising a light chain (LC) and a heavy chain (HC), wherein the LC and HC polypeptides are selected from the group consisting of in:
    [0024] [0024] LC of SEQ ID NO: 14 and HC of SEQ ID NO: 15;
    [0025] [0025] LC of SEQ ID NO: 14 and HC of SEQ ID NO: 16;
    [0026] [0026] LC of SEQ ID NO: 14 and HC of SEQ ID NO: 44;
    [0027] [0027] LC of SEQ ID NO: 38 and HC of SEQ ID NO: 39; and
    [0028] [0028] LC of SEQ ID NO: 49 and HC of SEQ ID NO: 50.
    [0029] [0029] In one embodiment, the present invention provides an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment comprising an LC of SEQ ID NO: 14 and an HC of SEQ ID NO: 15. In one In this embodiment, the present invention provides an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment comprising an LC of SEQ ID NO: 14 and an HC of SEQ
    [0030] [0030] In a preferred embodiment, the anti-N3pGlu Aβ monoclonal antibody comprises two light chains and two heavy chains where each LC is the polypeptide of SEQ ID NO: 14 and each HC is the polypeptide of SEQ ID NO: 15 In a preferred embodiment, the anti-N3pGlu Aβ monoclonal antibody comprises two light chains and two heavy chains where each LC is the polypeptide of SEQ ID NO: 14 and each HC is the polypeptide of SEQ ID NO: 16 In a preferred embodiment, the anti-N3pGlu Aβ monoclonal antibody comprises two light chains and two heavy chains where each LC is the polypeptide of SEQ ID NO: 14 and each HC is the polypeptide of SEQ ID NO: 44. In a preferred embodiment, the anti-N3pGlu Aβ monoclonal antibody comprises two light chains and two heavy chains where each LC is the polypeptide of SEQ ID NO: 38 and each HC is the polypeptide of SEQ ID NO: 39. In one embodiment preferred, the anti-N3pGlu Aβ monoclonal antibody comprises two light chains and two heavy chains in that each LC is the polypeptide of SEQ ID NO: 49 and each HC is the polypeptide of SEQ ID NO: 50.
    [0031] [0031] The present invention also provides a pharmaceutical composition comprising an anti-N3pGlu Aβ monoclonal antibody of the present invention or its antigen-binding fragment
    [0032] [0032] In a further aspect, the present invention provides a method of treating a condition associated with Aβ peptide activity, comprising administering to a human patient in need thereof an anti-N3pGlu Aβ monoclonal antibody or antigen binding fragment of the present invention.
    [0033] [0033] In a further aspect, the present invention provides a method of treating a condition selected from the group consisting of clinical or preclinical Alzheimer's disease, Alzheimer's prodromal disease, Down syndrome, and clinical or pre-CAA clinical, comprising the administration to a human in need of it an anti-N3pGlu Aβ monoclonal antibody of the present invention or its antigen binding fragment. In a preferred embodiment, the present invention provides a method of treating Alzheimer's disease.
    [0034] [0034] In a further aspect, the present invention provides an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment, for use in therapy. In a preferred embodiment, the present invention provides an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment, for use in the treatment of a condition selected from the clinical or preclinical disease of Alzheimer, prodromal disease Alzheimer's disease, Down syndrome, or clinical or preclinical CAA. In a more preferred embodiment, the present invention provides an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment, for use in the treatment of Alzheimer's disease. In another preferred embodiment, the present invention provides an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment, for use in preventing a condition selected from clinical or preclinical Alzheimer's disease, Alzheimer's prodromal disease , Clinical or preclinical CAA. In a more preferred embodiment, the present invention provides an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment for use in preventing Alzheimer's disease.
    [0035] [0035] In a further aspect, the present invention provides a use of an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment, in the production of a medicament for the treatment of a condition selected from a group consisting of in clinical or preclinical Alzheimer's disease, Alzheimer's prodromal disease, Down syndrome, and clinical or preclinical CAA. In a preferred embodiment, the present invention provides a use of an anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment, in the production of a medicament for the treatment of Alzheimer's disease.
    [0036] [0036] A life-size antibody is an immunoglobulin molecule comprising 2 heavy chains (H) and 2 light chains (L) interconnected by means of disulfide bonds. The amino terminal part of each chain includes a variable region of about 100-110 amino acids primarily responsible for recognizing the antigen through the complementarity determining regions (CDRs) contained therein. The carboxy terminal portion of each chain defines a constant region primarily responsible for the effector function.
    [0037] [0037] CDRs are interspersed with the regions that are conserved, so-called structural (FR) regions. Each light chain variable region (LCVR) and heavy chain variable region (HCVR) is composed of 3 CDRs and 4 FRs, arranged from the amino terminal to the carboxy terminal in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, FR4. The 3 CDRs of the light chain are referred to as "LCDR1, LCDR2, and LCDR3" and the 3 CDRs of the heavy chain are referred to as "HCDR1, HCDR2, and HCDR3". CDRs contain most of the residues that form the specific interactions with the antigen. The numbering and positioning of the CDR amino acid residues within the LCVR and HCVR regions are in accordance with the well-known Kabat numbering convention.
    [0038] [0038] Light chains are classified as cape or lambda, and are characterized by means of a specific constant region as known in the art. Heavy chains are classified as gamma, mu, alpha, delta, or epsilon, and define the isotype of an antibody as IgG, IgM, IgA, IgD, or IgE, respectively. IgG antibodies can also be divided into subclasses, for example, IgG1, IgG2, IgG3, or IgG4. Each type of heavy chain is characterized by means of a specific constant region with a sequence well known in the art.
    [0039] [0039] As used herein, the term "monoclonal antibody" (Mab) refers to an antibody that is derived from or isolated from a clone or single copy including, for example, any phage, eukaryotic, or prokaryotic clone, and not the method by which it is produced. Mabs of the present invention preferably exist in a homogeneous or substantially homogeneous population. Complete Mabs contain two heavy chains and two light chains. The phrase "antigen binding fragments" includes, for example, Fab fragments, Fab 'fragments, F (ab') 2 fragments, and single chain Fv fragments. The monoclonal antibodies of the present invention and their antigen binding fragments can be produced, for example, by means of recombinant technologies, phage display technologies, synthetic technologies
    [0040] [0040] The phrase "human-engineered antibodies" refers to monoclonal antibodies that have binding and functional properties according to the invention, and that have framework regions that are substantially human or fully human surrounding CDRs derived from an antibody not human. The "antigen binding fragments" of such human-designed antibodies include, for example, Fab fragments, Fab 'fragments, F (ab') 2 fragments, and single chain Fv fragments. The "frame region" or "frame sequence" refers to any of the frame regions 1 through
    [0041] [0041] Fully human structures are those that are identical to a known human germline structure sequence. The germline sequences of the human structure can be obtained from ImMunoGeneTics (IMGT) through their website http://imgt.cines.fr, or from The Immunoglobulin FactsBook by Marie-Paule Lefranc and Gerard Lefranc, Academic Press, 2001 , ISBN
    [0042] [0042] Antibodies engineered by humans in addition to those described herein having similar functional properties according to the present invention can be generated using several different methods. The specific compounds of the antibodies described herein can be used as compounds of the parent antibody or standards to prepare additional compounds of the antibody. In one approach, the CDRs of the parent antibody compound are grafted into a human structure that has a high sequence identity with the parent antibody compound structure. The sequence identity of the new structure should generally be at least about 80%, at least about 85%, at least about 90%, at least about 95%, or at least about 99 % identical to the sequence of the corresponding structure in the parent antibody compound. This graft can result in a reduction in binding affinity compared to that of the source antibody. If this is the case, the structure can be re-transformed to the origin structure in certain positions based on the specific criteria described by Queen and others, (1991) Proc. Natl. Acad. Sci. USA 88: 2869. Additional references describing methods useful in humanizing mouse antibodies include U.S. Patent Nos. 4,816,397; 5,225,539, and
    [0043] [0043] The identification of waste to consider retransformation can be performed as follows:
    [0044] [0044] When an amino acid falls under the category that follows, the amino acid of the structure of the human germline sequence being employed (a "receptor structure") is replaced by an amino acid of the structure from a structure of the antibody compound source (the "donor structure"):
    [0045] [0045] the amino acid in the human structure region of the receptor structure is unusual for human structures in that position, whereas the corresponding amino acid in the donor immunoglobulin is typical for human structures in that position;
    [0046] [0046] the position of the amino acid is immediately adjacent to one of the CDRs; or
    [0047] [0047] any atom of the side chain of an amino acid of the structure is within about 5-6 angstrons (center to center) of any atom of an amino acid of the CDR in a three-dimensional immunoglobulin model.
    [0048] [0048] When each of the amino acids in the human structure region of the recipient structure and a corresponding amino acid in the donor structure is generally uncommon for the human structures in that position, that amino acid can be replaced by a typical amino acid for human structures in that position. This retransformation criterion allows one to recover the activity of the compound of the originating antibody.
    [0049] [0049] Another approach for generating human-designed antibodies having similar functional properties for the antibody compounds described here involves randomly mutating amino acids within the grafted CDRs without altering the structure, and analyzing the resulting molecules for alloy affinity - tion and other functional properties that are as good as or better than those of the compounds of the originating antibody. Individual mutations can also be introduced at each amino acid position within each CDR, followed by an assessment of the effects of such mutations on binding affinity and other functional properties. Individual mutations producing the improved properties can be combined to assess their effects in combination with each other.
    [0050] [0050] In addition, a combination of both previous approaches is possible. After grafting the CDR, one can re-transform the specific structure regions, in addition to introducing the amino acid changes in the CDRs. This methodology is described in Wu and other
    [0051] [0051] Applying the teachings of the present invention, a person skilled in the art can employ common techniques, for example, site-directed mutagenesis, to replace the amino acids within the structure and CDR sequences currently described and thereby still generate the amino acid sequences from the variable region derived from the current sequences. Any alternative of naturally occurring amino acids can be introduced at a specific substitution site. The methods described here can then be employed to evaluate these additional variable region amino acid sequences to identify the sequences having the functions indicated in vivo. In this way, additional sequences suitable for the preparation of human-designed antibodies and their antigen binding parts according to the present invention can be identified. Preferably, the substitution of the amino acid within the structures is restricted to one, two, or three positions within any one or more of the 4 light chain and / or heavy chain structure regions described herein. Preferably, amino acid substitution within C-DRs is restricted to one, two, or three positions within any one or more of the 3 light chain and / or heavy chain CDRs. Combinations of various changes within these framework regions and the C-DRs described above are also possible.
    [0052] [0052] The term "treating" (or "treating" or "treatment") refers to processes involving a decrease, interruption, interruption, control, halt, reduction, or reversal of the progression or severity of a symptom, disorder, condition, or existing disease, but not necessarily involves a total elimination of all disease-related symptoms, conditions, or disorders associated with the anti-N3pGlu Aβ antibody.
    [0053] [0053] The antibodies of the present invention can be used
    [0054] [0054] The results of the tests that follow demonstrate that the monoclonal antibodies and their antigen-binding fragments of the present invention are useful for the treatment of a condition associated with the activity of Aβ peptide such as Alzheimer's disease, Down syndrome , and CAA. Example 1: Production of Antibodies
    [0055] [0055] Initial Antibody Generation: Transgenic FVB mice are immunized with the human amyloid β peptide modified by pyroglutamate and truncated by N 3-42 terminal (N3pGlu) pretreated at 37 ° C overnight to form the aggregate of. The spleen cells of the mice are harvested and the reactive B cells Aβ1-40 depleted by MACS. The remaining cells are separated for binding to the aggregated Aβ N3pGlu peptide. RNA is isolated from selected B cells and converted to cDNA using oligo dT. The light and heavy variable regions of the antibody are obtained by PCR using the primers of the antibody signal sequence and cloned into the phage vector by Kunkel mutagenesis to produce the Fab library. The Fab library is evaluated for binding to the N3pGlu peptide aggregated by Single Point ELISA (SPE) and counter evaluated against Aβ1-40. Positive clones are characterized by DNA sequencing, fab expression, and binding to the Aβ N3pGlu peptide, and lack of binding to the soluble Aβ1-40 or Aβ1-42 peptide.
    [0056] [0056] The unique mutant amino acid libraries are constructed and evaluated by SPE for binding to the aggregated Aβ N3pGlu peptide, but not for Aβ1-42. Beneficial mutations are combined in the combinatorial libraries. The combinatorial variants optimized by affinity are selected and converted into the mouse IgG1 for affinity measurement by BIACORE® and binding of the Aβ plate by immunohistochemistry. From an identified clone, the mAb protein is made in both mouse IgG1 (mE8) and IgG2a (mE8c) isotypes for in vivo efficacy studies. mE8 does not bind the mouse Aβ N3pGlu sequence (mpE3-16) or human Aβ1-42.
    [0057] [0057] The human germline structures VH1-69 / JH6 and Vk-A18 / JK2 are used for the initial humanization. The CDRs of the mE8 antibody (with four affinity mutations) are grafted onto human structures resulting in hE8-C6 antibody. Another affinity optimization is performed on the hE8-C6 structure, and the beneficial mutations are combined to produce high affinity, humanized variant R5, R17, R24 and 2420.
    [0058] [0058] Second optimization cycle to improve the drug's developability: Two humanized variants, hE8-C6 and R17, are chosen as the framework for a second optimization cycle to improve the serum half-life of the antibody by reducing non-specific binding to cells and to increase the affinity of the antibody to the soluble Aβ N3pGlu peptide. A soluble biotinylated peptide consisting of the 14 N-terminal amino acids of Aβ N3pGlu (pE3-16B) is synthesized and evaluated to be equivalent to the Aβ N3pGlu peptide for binding to the mE8 antibody. A high productivity filter life assay using pE3-16B is developed and applied for all subsequent library analysis. All strokes of the filter support sieve are confirmed by binding to aggregated Aβ N3pGlu.
    [0059] [0059] The libraries of the hE8-C6 variants are reevaluated using the filter support assay and a set of beneficial mutations is identified. A subset of it is used to produce the combinatorial library. Four combi variants (CoII-E10, CoII-G2, CoII-G8 and CoII-E2) are selected from this approach.
    [0060] [0060] Computer modeling is used to create the structural models of the V region of hE8-C6, R17, R24 and other variants. The structural analysis of the model identifies the positive charges introduced for the cluster of affinity optimization at the binding site, a potential cause of non-specific antibody linking the cells. Based on the modeling, several positions are selected to introduce changes to balance the potential of the electrostatic surface. A combinatorial library is synthesized through the combination of some beneficial mutations from the analysis of the library and the changes defined through structural modeling. Three variants (R17m-B4, R17m-A12 and R17m-B12) are selected from this effort for other studies.
    [0061] [0061] The structural analysis of the model also discovers a steric confrontation between the residue of the light chain structure Y36 and the residues in the heavy chain CDR3. The Y36L mutation is introduced to the hE8-C6 light chain to produce hE8L variant. This change in structure is only found to have a significant impact on both increased antibody affinity and reduced nonspecific cell binding.
    [0062] [0062] The other effort was to test different human structures for humanization. The CDRs of the mE8 antibody are grafted into the VH5-51 / VKO2 and VH3-23 / VKA2 structures. Fab humanized with VH5-51 / VKO2 (hE8-51O2) is determined to be equivalent, if not better, to hE8-C6 at the Aβ N3pGlu bond. The introduction of additional beneficial mutations in hE8-51O2 generates the combi CI-A1, CI-B6, C1-C7 and CI-B8 variants.
    [0063] [0063] After passing all in vitro assays, including ELISA and BIACORE® for antigen affinity and specificity, non-specific cell binding, and IHC staining, five mAbs, B12L, C1-C7, hE8L, R17L, and R17 variants are selected.
    [0064] [0064] Antibodies can be produced and purified essentially as follows. An appropriate host cell, such as HEK 293 EBNA or CHO, is either transiently or stably transfected with an expression system for antibody secretion employing an optimal predetermined ratio of the HC: LC vector or a unique vector system encoding HC as well. , such as SEQ ID NO: 56, and SEQ ID NO: 43, and LC, such as SEQ ID NO: 55. Clari fi ed media, in which the antibody has been hidden, is purified using any of the many techniques commonly employed. For example, the medium can be conveniently applied to a Protein A or G Sepharose FF column that has been equilibrated with a compatible buffer, such as phosphate buffered saline (pH 7.4). The column is washed to remove non-specific binding components. The binding antibody is eluted, for example, by a pH gradient (such as 0.1 M sodium phosphate buffer, pH 6.8 to 0.1 M sodium citrate buffer, pH 2 , 5). Antibody fractions are detected, such as, by means of SDS-PAGE, and are then pooled. Additional purification is optional, depending on the intended use. The antibody can be concentrated and / or filtered sterile using common techniques. The multimers and soluble aggregate can be effectively removed using common techniques, including size exclusion, hydrophobic interaction, ion exchange, or hydroxyapatite chromatography. The purity of the antibody after these chromatography steps
    [0065] [0065] The surface plasmon resonance evaluated with the BIACORE® 2000 instrument is used to measure the binding of the A3 N3pGlu antibodies to the anti-N3pGlu. Except as noted, all reagents and materials are from BIACORE® AB (Upsala, Sweden). All measurements are carried out at 25 ° C. The samples are dissolved in HBS-EP buffer (150 mM sodium chloride, 3 mM EDTA, 0.005% P-20 (weight / volume) surfactant, and 10 mM HEPES, pH 7.4).
    [0066] [0066] A series of Abeta peptides with positional changes (mutant glycine) are synthesized to assess the impact of a certain residue on the binding of the antibody and thereby identify the characteristics and the sequence necessary for the recognition of the antibody:
    [0067] [0067] The importance of a truncated (des 1,2) and modified form of glutamic acid (3 pyr-E or 3 pyr-Glu) is assessed by comparing the Aβ 1-42 Aβ 3-16 bond versus pE3-16 (SEQ ID NO: 1 versus SEQ ID NO: 26 versus SEQ ID NO: 25, respectively). The peptides are dissolved in PBS at 5mg / ml before dilution for binding experiments.
    [0068] [0068] Ligation is assessed using multiple analytical cycles of antibody capture, association / peptide injection, prolonged buffer flow for dissociation, and surface regeneration. For the step of capturing the antibody, depending on the type of antibody to be captured, how the CM5 chip is immobilized or with protein A or goat anti-mouse Fc. Except for mouse antibodies, each cycle consists of: ~ 5-7 L injection of 10 g / mL of anti-N3pGlu antibody at 5 l / min (capture of approximately 3,000 RU), injection of 100 L of peptide in 50 l / min (1000 nM - 62.5 nM in two-fold serial dilutions for each cycle), followed by 10 minutes of dissociation. For a mouse antibody, the flow rate is 50 L / min, and 20 L of mouse antibody at 50 g / ml is injected. In both cases, the chip surface is regenerated using 20 L of 10 mM glycine hydrochloride, pH 1.5. The link affinity (KD) is then obtained from the association and dissociation rates for each cycle using a 1: 1 link model in the BIAevaluation analysis software. The anti-N3pGlu, B12L and R17L antibodies and the mouse parental antibody (mE8C) recognize Aβ N3pGlu specifically, with a KD less than 1 nM. The anti-N3pGlu, B12L and R17L antibodies and the mouse parental antibody (mE8C) also binds to pE3-16 with similar affinity, indicating that the epitope is located within this region of the peptides. The binding analysis of antibodies to the mutant glycine peptides shows that the residues critical for binding were 3 to 7: pyroE in position 3, F in position 4, R in position 5, H in position 6, D in position 7 The detectable binding to Aβ1-40 is not detected by the antibodies of the present invention. Example 3: Affinity of binding to aggregated N3pGlu
    [0069] [0069] BIACORE® experiments are also conducted to monitor the binding of anti-N3pGlu antibodies to the aggregated Aβ N3pGlu. In this experiment, the Aβ N3pGlu peptide is immobilized at different densities for flow cells 2 (low density, LD), 3 (medium density, MD), and 4 (high density, HD) on a CM-5 chip through chemistry amine coupling. Different levels of Aβ N3pGlu peptide are immobilized to examine the impact of surface density on the binding of anti-N3pGlu antibodies. After immobilization, most N3pGlu aggregates on the surface as demonstrated by the lack of binding of a control Mab that only recognizes the monomer peptide. This aggregated form of peptide mimics the property of the aggregated abeta peptide in the form of fibril or amyloid, in which the N-terminal region of the peptides is exposed and can be targeted with antibodies.
    [0070] [0070] The binding is evaluated using the multiple analytical cycles at 25 ° C. each cycle is performed at a flow rate of 50 L / min and consists of the following steps: 250 L injection of N3pGlu antibody solution (starting at 500 nM and using two-fold serial dilutions for each cycle) followed by 20 minutes for decoupling,
    [0071] [0071] Immunohistochemical analysis is performed with exogenously added Aβ antibodies in order to determine the ex vivo target fit in the brain sections from a fixed PDAPP brain (24 months old). The transgenic PDAPP mouse has been shown to develop much of the pathology associated with Alzheimer's disease. For murine antibodies, a biotin tag was used as the label since this experiment was conducted on murine tissue, and so a direct comparison between non-biotinylated non-murine anti-N3pGlu antibodies is not appropriate. The 3D biotinylated N terminal antibody (1-5) robustly labels the significant amounts of Aβ deposited in the hippocampus PDAPP, whereas the biotinylated mE8 labels only a subset of deposits. Unlike the human AD brain, the vast majority of Aβ deposited in the PDAPP brain is life-size. Similar plaque labeling for non-biotinylated anti-N3pGlu antibodies, such as B12L and R17L (compared to mE8), is observed. No specific plaque labeling is observed either for the mouse or human control IgG's. Because the composition and likely structure of deposited Aβ are dramatically different in the AD brain, non-biotinylated anti-N3pGlu antibodies (3 µg / ml) are investigated to determine whether they bind to Aβ deposited in brain sections from the brain. Freshly frozen AD. The positive control antibody (3D6 bi-tinylated) intensely labels many Aβ plaques in the AD brain, considering that the negative control antibodies (human and murine IgG) lack any appreciable binding. Several of the non-biotinylated anti-N3pGlu antibodies, such as B12L and R17L, bind similarly to the deposited Aβ. These histological studies demonstrate that the anti-N3pGlu antibodies of the present invention can employ the target Aβ deposited ex vivo. Example 5: Target Adjustment Studies In Vivo
    [0072] [0072] The ability of anti-N3pGlu antibodies to employ the target deposited in vivo is assessed. A 4-week subchronic study is performed with biotinylated murine antibodies 3D6 and mE8c at 40 mg / kg weekly administered intraperitoneally (IP). The brains are harvested at the conclusion of the experiment and the level of the target adjustment is determined through histological examination of the brain. Animals injected with biotinylated 3D6 have plaque labeling only along the hippocampal fissure, whereas mice injected with biotinylated mE8c have robust plate labeling in the hippocampus and cortical regions. Very similar target fit patterns are seen in a 3-day trial more acute (hippocampal fissure 3D6 staining and mE8 labeling both in the hippocampal and cortical regions). These results strongly suggest that the 3D6 antibody, which binds both soluble and insoluble Aβ, is
    [0073] [0073] A study of therapeutic plaque reduction in 23-month-old PDAPP mice is performed with the following antibodies: negative control antibody (IgG2a), 3D6, mE8 (IgG1), and mE8c (IgG2a). Elderly PDAPP mice are injected subcutaneously with 12.5 mg / kg of each antibody per week for three months.
    [0074] [0074] A histological study is carried out to investigate whether the mechanism of action of N3pGlu antibodies that leads to decreased plaque reduction in elderly PDAPP mice would result in an exacerbation of CAA-related micro-hemorrhage.
    Previous studies have shown that the treatment of elderly transgenic APP mice with certain anti-Aβ carboxyl terminal and amino-terminal antibodies should lead to an increase in CAA-related micro-hemorrhage (Pfeifer et al., 2002; Wilcock and others, 2004; Racke and others, 2005). Although the fundamental mechanism of this potential adverse event is unclear, two non-mutually exclusive hypotheses have been proposed: the redistribution of Aβ in cerebral blood vessels (Wilcock et al., 2004) or the direct attachment of antibodies to Existing CAA (Racke et al., 2005). Biochemical and histological analysis shows that Aβp3-x is a constituent of CAA in both AD patients and elderly PDAPP mice.
    A detailed histological analysis for micro-hemorrhage in elderly PDAPP mice (23 to 26 months of age) that was therapeutically treated with control antibodies and N3pGlu is performed for three months with subcutaneous injections weekly at 12.5 mg / kg.
    The positive control for the analysis of micro-hemorrhage is 3D6 of the chronically treated animals that have previously demonstrated that this anti-Aβ amino-terminal antibody significantly exacerbates micro-hemorrhage (Racke et al., 2005). At the conclusion of the study, one hemi-brain of each animal is fixed by drop-fixed in 4% formaldehyde and embedded in paraffin.
    Coronal sections covering 2 mm of tissue are sectioned on 50 slides (four 10 µm sections per slide). Eleven slides of the same intervals crossing the 2 mm of tissue are stained with Perls Blue in order to visualize hemosiderin (accumulation of cellular iron due to micro-hemorrhage). Two sections per slide are manually counted in a blind manner.
    Chronic treatment of elderly PDAPP mice with 3D6 (positive control) dramatically increases micro-hemorrhage (p <0.001). Importantly, it is shown that treatment with each mE8 (IgG1) or mE8c (IgG2a) does not exacerbate micro-hemorrhage, even through these N3pGlu antibodies significantly less Aβ deposited in these animals.
    These results demonstrate that the N3pGlu antibodies in this Example do not exacerbate CAA-related micro-hemorrhage in elderly PDAPP mice.
    权利要求:
    Claims (1)
    [1]
    1. Human-designed anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment, characterized by the fact that it comprises a light chain variable region (LCVR) and a heavy chain variable region (HCVR), in that said LC-VR comprises the polypeptides LCDR1, LCDR2, and LCDR3 and HCVR comprises polypeptides HCDR1, HCDR2, and HCDR3 which are selected from the group consisting of: a) LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LC-DR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYDFTRYYIN (SEQ ID NO: 6), HCDR2 is WINPGSGNTKYNEKFKG (SEQ ID NO: 8), and HCDR3 is EGIT (SEQ ID NO: 9); b) LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LC-DR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYTFTRYYIN (SEQ ID NO: 7), HCDR2 is WINPGSGNTKYNEKFKG (SEQ ID NO: 8), and HCDR3 is EGTTVY (SEQ ID NO: 10); c) LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LC-DR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYTFTDYYIN (SEQ ID NO: 40), HCDR2 is WINPGSGNTKYNEKFKG (SEQ ID NO: 8), and HCDR3 is EGETVY (SEQ ID NO: 41); d) LCDR1 is KSSQSLLYSRGKTYLN (SEQ ID NO: 3), LC-DR2 is AVSKLGS (SEQ ID NO: 35), LCDR3 is VQGTHYPFT (SEQ ID NO: 5), HCDR1 is GYTFTRYYIN (SEQ ID NO: 7), HCDR2 is WINPGSGNTKYNEKFKG (SEQ ID NO: 8), and HCDR3 is EGTTVY (SEQ ID NO: 10); and e) LCDR1 is KSTRSLLYSRSKTYLN (SEQ ID NO: 45), LC-DR2 is AVSKLDS (SEQ ID NO: 4), LCDR3 is VQGTHYPFT (SEQ ID NO:
    5), HCDR1 is GYTFTDYYIN (SEQ ID NO: 40), HCDR2 is WINPGSGNTKYNEKFKG (SEQ ID NO: 8), and HCDR3 is EGVTVY (SEQ ID NO: 46).
    2. Human-designed Aβ anti-N3pGlu monoclonal antibody or its antigen binding fragment according to claim 1, characterized by the fact that it comprises a light chain variable region (LCVR) and a variable chain region heavy (HCVR), in which said LCVR and HCVR are the polypeptides selected from the group consisting of: a) LCVR of SEQ ID NO: 11 and HCVR of SEQ ID NO: 12; b) LCVR of SEQ ID NO: 11 and HCVR of SEQ ID NO: 13; c) LCVR of SEQ ID NO: 11 and HCVR of SEQ ID NO: 42; d) LCVR of SEQ ID NO: 36 and HCVR of SEQ ID NO: 37; and e) LCVR of SEQ ID NO: 47 and HCVR of SEQ ID NO: 48.
    3. Human-designed Aβ anti-N3pGlu monoclonal antibody or its antigen binding fragment according to claim 1 or 2, characterized by the fact that it comprises a light chain (LC) and a heavy chain (HC ), in which the LC and HC polypeptides are selected from the group consisting of: a) LC from SEQ ID NO: 14 and HC from SEQ ID NO: 15; b) LC of SEQ ID NO: 14 and HC of SEQ ID NO: 16; c) LC of SEQ ID NO: 14 and HC of SEQ ID NO: 44; d) LC of SEQ ID NO: 38 and HC of SEQ ID NO: 39; and e) LC from SEQ ID NO: 49 and HC from SEQ ID NO: 50.
    4. Human-designed anti-N3pGlu Aβ monoclonal antibody or its antigen binding fragment according to claim 3, characterized by the fact that it comprises two light chains and two heavy chains in which each light chain and each chain heavy are the polypeptides selected from the group consisting of:
    a) LC of SEQ ID NO: 14 and HC of SEQ ID NO: 15; b) LC of SEQ ID NO: 14 and HC of SEQ ID NO: 16; c) LC of SEQ ID NO: 14 and HC of SEQ ID NO: 44; d) LC of SEQ ID NO: 38 and HC of SEQ ID NO: 39; and e) LC from SEQ ID NO: 49 and HC from SEQ ID NO: 50.
    5. Pharmaceutical composition, characterized by the fact that it comprises the human-designed antibody or its antigen binding fragment, as defined in any one of claims 1 to 4, and a pharmaceutically acceptable carrier, diluent, or excipient.
    6. Pharmaceutical composition, characterized by the fact that it comprises the human-designed antibody or its antigen binding fragment, as defined in any one of claims 1 to 4 and a pharmaceutically acceptable carrier, diluent, or excipient for use in therapy.
    7. Pharmaceutical composition, characterized by the fact that it comprises the human-designed antibody or its antigen binding fragment, as defined in any one of claims 1 to 4 and a pharmaceutically acceptable carrier, diluent, or excipient, for use in the treatment of a condition selected from clinical or preclinical Alzheimer's disease, Alzheimer's prodromal disease, Down syndrome, or clinical or preclinical CAA.
    8. Pharmaceutical composition, characterized by the fact that it comprises the human-designed antibody or its antigen binding fragment, as defined in any one of claims 1 to 4 and a pharmaceutically acceptable carrier, diluent, or excipient for use in the treatment of Alzheimer's disease.
    9. Antibody designed by human or its antigen binding fragment, according to any one of claims 1 to 4, characterized by the fact that it is for use in therapy.
    10. Antibody designed by human or its antigen binding fragment, according to any one of claims 1 to 4, characterized for use in the treatment of a condition selected from the clinical or preclinical disease Alzheimer's disease, Alzheimer's prodromal disease, Down syndrome, or clinical or preclinical CAA.
    11. Antibody designed by human or its antigen binding fragment according to claim 10, characterized by the fact that it is for use in the treatment of Alzheimer's disease.
    12. Use of an antibody, as defined in any one of claims 1 to 4, characterized in that it is for the preparation of a pharmaceutical composition in the treatment of clinical or preclinical Alzheimer's disease, Alzheimer's prodromal disease, Down, and clinical or preclinical cerebral amyloid angiopathy (CAA).
    13. Invention, characterized by any of its concretizations or categories of claim encompassed by the material initially revealed in the patent application or in its examples presented herein.
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    法律状态:
    2020-08-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-11-17| B07D| Technical examination (opinion) related to article 229 of industrial property law [chapter 7.4 patent gazette]|Free format text: DE ACORDO COM O ARTIGO 229-C DA LEI NO 10196/2001, QUE MODIFICOU A LEI NO 9279/96, A CONCESSAO DA PATENTE ESTA CONDICIONADA A ANUENCIA PREVIA DA ANVISA. CONSIDERANDO A APROVACAO DOS TERMOS DO PARECER NO 337/PGF/EA/2010, BEM COMO A PORTARIA INTERMINISTERIAL NO 1065 DE 24/05/2012, ENCAMINHA-SE O PRESENTE PEDIDO PARA AS PROVIDENCIAS CABIVEIS. |
    2020-12-29| B07E| Notification of approval relating to section 229 industrial property law [chapter 7.5 patent gazette]|
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    2022-02-15| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
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