Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
  • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
  • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
  • C07K16/289—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against CD45
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
  • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
  • A61K51/04—Organic compounds
  • A61K51/08—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins
  • A61K51/10—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody
  • A61K51/1027—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody against receptors, cell-surface antigens or cell-surface determinants
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
  • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
  • A61K51/04—Organic compounds
  • A61K51/08—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins
  • A61K51/10—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody
  • A61K51/1045—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody against animal or human tumor cells or tumor cell determinants
  • A61K51/1069—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody against animal or human tumor cells or tumor cell determinants the tumor cell being from blood cells, e.g. the cancer being a myeloma
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
  • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
  • A61K51/04—Organic compounds
  • A61K51/08—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins
  • A61K51/10—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody
  • A61K51/1093—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody conjugates with carriers being antibodies
  • A61K51/1096—Antibodies or immunoglobulins; Fragments thereof, the carrier being an antibody, an immunoglobulin or a fragment thereof, e.g. a camelised human single domain antibody or the Fc fragment of an antibody conjugates with carriers being antibodies radioimmunotoxins, i.e. conjugates being structurally as defined in A61K51/1093, and including a radioactive nucleus for use in radiotherapeutic applications
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2317/00—Immunoglobulins specific features
  • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
  • C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2317/00—Immunoglobulins specific features
  • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
  • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
  • C07K2317/565—Complementarity determining region [CDR]
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2317/00—Immunoglobulins specific features
  • C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
  • C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value

Definitions

• the invention relates to the field of antibody-based therapeutics.
• the CD45 antigen is a member of the protein tyrosine phosphatase (PTP) family and is a 180-240 kD trans-membrane glycoprotein. It is also known as the leukocyte common antigen (LCA), T200, or Ly-5. CD45 plays a key role in T-cell and B-cells receptor signal transduction. Different isoforms of CD45 exist due to variable splicing of its exons. These isoforms are very specific to the activation and maturation state of the cell as well as cell type.
• PTP protein tyrosine phosphatase
• LCA leukocyte common antigen
• CD45 plays a key role in T-cell and B-cells receptor signal transduction. Different isoforms of CD45 exist due to variable splicing of its exons. These isoforms are very specific to the activation and maturation state of the cell as well as cell type.
• the various isofonns have the same trans-membrane and cytoplasmic segments, but different extra-cellular domains, and are differentially expressed on subpopulations of B- and T-cell lymphocytes.
• the primary ligands described for CD45 include galectin-1, CD1, CD2, CD3, CD4, TCR, CD22 and Thy-1.
• CD45RA recognizes the product of exon- A.
• CD45RB recognizes the product of exon-B.
• the mAbs designated CD45RO selectively bind to the 180 kD isoform (without any of the variable exons A, B or C) which is restricted to a subset of cortical thymocytes, activated T cells and memory cells, and is absent on B cells.
• BC8 also known as apamistamab, is a murine IgGl monoclonal antibody that recognizes all isoforms of human CD45.
• CD45 Cells of hematopoietic origin, except mature erythrocytes and platelets, generally express CD45. High expression of CD45 is seen with most acute lymphoid and myeloid leukemias. Since CD45 is not found on tissues of non-hematopoietic origin, its specific expression in leukemia has made it a good target for developing therapeutics, including radio- immunotherapeutics. For example, CD45 is expressed at a density of approximately 200,000 to 300,000 sites per cell on circulating leukocytes and malignant B cells.
• an anti-huCD45 antibody comprising:
• a heavy chain which is mCD45-HC parental, huCD45.HCl, huCD45.HC2, huCD45.HC3, huCD45.HCl, or huCD45.HC4, or any of said heavy chains without the signal sequence, or a heavy chain comprising the heavy chain variable region of any of said heavy chains;
• a related aspect of the invention provides an anti-huCD45 antibody or a human CD45-binding antibody fragment, including:
• an immunoglobulin heavy chain variable region including SEQ ID NO:2 (from mCD45-HC parental), SEQ ID NO:7 (from huCD45.HCl), SEQ ID NO: 12 (from huCD45.HC2), SEQ ID NO: 17 (from huCD45.HC3), or SEQ ID NO:22 (from huCD45.HC4); and
• an immunoglobulin light chain variable region including SEQ ID NO:28 (from mCD45-LC parental), SEQ ID NO:33 (from huCD45.LCl), SEQ ID NO:38 (from huCD45.LC2), SEQ ID NO:43 (from huCD45.LC3), or SEQ ID NO:48 (from huCD45.LC4), provided that when the heavy chain variable region includes SEQ ID NO:2, the light chain variable region is not SEQ ID NO:28.
• the anti-huCD45 antibody or human CD45 -binding antibody fragment includes:
• an immunoglobulin heavy chain sequence including SEQ ID NO:6 (from mCD45- HC parental), SEQ ID NO:11 (fromhuCD45.HCl), SEQ ID NO: 16 (fromhuCD45.HC2), SEQ ID NO:21 (from huCD45.HC3), or SEQ ID NO:26 (from huCD45.HC4); and (ii) an immunoglobulin light chain sequence including SEQ ID NO: 32 (from mCD45- LC parental).
• SEQ ID NO:37 (from huCD45.LCl), SEQ ID NO:42 (fromhuCD45.LC2), SEQ ID NO:47 (from huCD45.LC3), or SEQ ID NO:52 (from huCD45.LC4).
• Another aspect of the invention provides an anti-huCD45 antibody or a huCD45 -binding antibody fragment, including:
• CDRs immunoglobulin heavy chain complementarity determining regions
• CDRs immunoglobulin light chain complementarity determining regions
• a related aspect of the invention provides an anti-huCD45 antibody or a huCD45 -binding antibody fragment, including:
• CDRs immunoglobulin heavy chain complementarity determining regions
• CDRs immunoglobulin light chain complementarity determining regions
• FIGS. 1-10 Various antibody heavy and light chain amino acid sequences are set forth in FIGS. 1-10.
• FIG. 1 shows the amino acid sequence of a heavy chain of mouse anti-huCD45 antibody (“m CD45-HC parental”) that binds all isoforms of human CD45 (huCD45) and portions thereof used as the basis for producing humanized anti-huCD45 antibodies.
• m CD45-HC parental mouse anti-huCD45 antibody
• FIG. 2 shows the amino acid sequence of a humanized anti-huCD45 antibody heavy chain (“hu CD45.HC1”) and portions thereof.
• FIG. 3 shows the amino acid sequence of a humanized anti-huCD45 antibody heavy chain (“hu CD45.HC2”) and portions thereof.
• FIG. 4 shows the amino acid sequence of a humanized anti-huCD45 antibody heavy chain (“hu CD45.HC3”) and portions thereof.
• FIG. 5 shows the amino acid sequence of a humanized anti-huCD45 antibody heavy chain (“hu CD45.HC4”) and portions thereof.
• FIG. 6 shows the amino acid sequence of a light chain of mouse anti-huCD45 antibody (“m CD45-LC parental”) and portions thereof used as the basis for producing humanized anti-huCD45 antibodies.
• FIG. 7 shows the amino acid sequence of a humanized anti-huCD45 antibody light chain (“hu CD45.LC1”) and portions thereof.
• FIG. 8 shows the amino acid sequence of a humanized anti-huCD45 antibody light chain (“hu CD45.LC2”) and portions thereof.
• FIG. 9 shows the amino acid sequence of a humanized anti-huCD45 antibody light chain (“hu CD45.LC3”) and portions thereof.
• FIG. 10 shows the amino acid sequence of a humanized anti-huCD45 antibody light chain (“hu CD45.LC4”) and portions thereof.
• CDR complementarity determining region
• One aspect of the invention provides an anti-(human CD45) [“anti-huCD45”] antibody, comprising:
• a heavy chain which is mCD45-HC parental, huCD45.HCl, huCD45.HC2, huCD45.HC3, huCD45.HCl, or huCD45.HC4, or any of said heavy chains without the signal sequence, or a heavy chain comprising the heavy chain variable region of any of said heavy chains;
• the parental murine monoclonal antibody including the parental heavy chain shown in FIG. 1 and the parental light chain shown in FIG. 6, which binds all isoforms of human CD45 was used as the basis for designing humanized anti-huCD45 antibodies.
• Antibodies consisting of various combinations of the humanized immunoglobulin heavy chains and immunoglobulin light chains were expressed in CHO cells and isolated for analysis and comparison to the parental antibody. Binding experiments were performed using an Octet HTX (Sartorius, Bohemia, New York, USA) at 25°C to determine the KD’s of the antibodies.
• the antibodies were loaded onto anti -human Fc capture (AHC) sensors.
• Table 1 hu CD45 HC3+LC3 retained similar binding affinity as the parental antibody while all other humanized samples showed less than 10-fold changes in KD values relative to the parental antibody.
• Another aspect of the invention provides an anti-huCD45 antibody or a human CD45-binding antibody fragment, including:
• an immunoglobulin heavy chain variable region including SEQ ID NO:2 (from mCD45-HC parental), SEQ ID NO:7 (from huCD45.HCl), SEQ ID NO: 12 (from huCD45.HC2), SEQ ID NO: 17 (from huCD45.HC3), or SEQ ID NO:22 (from huCD45.HC4); and
• an immunoglobulin light chain variable region including SEQ ID NO:28 (from mCD45-LC parental), SEQ ID NO:33 (from huCD45.LCl), SEQ ID NO:38 (from huCD45.LC2), SEQ ID NO:43 (from huCD45.LC3), or SEQ ID NO:48 (from huCD45.LC4), provided that when the heavy chain variable region includes SEQ ID NO:2, the light chain variable region is not SEQ ID NO:28.
• the anti-huCD45 antibody or human CD45 -binding antibody fragment includes:
• an immunoglobulin heavy chain sequence including SEQ ID NO:6 (from mCD45- HC parental), SEQ ID NO:11 (fromhuCD45.HCl), SEQ ID NO: 16 (fromhuCD45.HC2), SEQ ID NO:21 (from huCD45.HC3), or SEQ ID NO:26 (from huCD45.HC4); and
• an immunoglobulin light chain sequence including SEQ ID NO: 32 (from mCD45- LC parental), SEQ ID NO:37 (from huCD45.LCl), SEQ ID NO:42 (fromhuCD45.LC2), SEQ ID NO:47 (from huCD45.LC3), or SEQ ID NO:52 (from huCD45.LC4).
• a further aspect of the invention provides an anti-huCD45 antibody or a huCD45 -binding antibody fragment, including:
• CDRs immunoglobulin heavy chain complementarity determining regions
• CDRs immunoglobulin light chain complementarity determining regions
• the antibody or antibody fragment includes a heavy chain variable region that includes the heavy chain CDRs and a light chain variable region that includes the light chain CDRs.
• a related aspect of the invention provides an anti-huCD45 antibody or a huCD45 -binding antibody fragment, including:
• CDRs immunoglobulin heavy chain complementarity determining regions
• CDRs immunoglobulin light chain complementarity determining regions
• the antibody or antibody fragment includes a heavy chain variable region that includes the heavy chain CDRs and a light chain variable region that includes the light chain CDRs.
• the antibody or antibody fragment or protein further includes with respect to one or more of the recited CDRs, in any and all combinations, additional N-terminal and/or C-terminal amino acid sequence, of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 amino acid residues immediately adjacent to the one or more CDRs (on either or both of the N-terminal and C-terminal side of the CDR(s)) as shown in the any of the respective variable region amino acid sequences set forth in FIGS. 1-10.
• Another aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45-binding antibody fragment (such as Fab fragment, Fab2 fragment, or scFv molecule) or an immunoglobulin light chain, including an antibody light chain variable region including the following light chain CDRs: a CDR-L1 including the amino acid sequence RASKSVSTSGYSYLH (SEQ ID NO:59), KSSKSVSTSGYSYLH (SEQ ID NO:62), RASKSVSTSGYSYLA (SEQ ID NO:65), RASKSVSTSGYSYLS (SEQ ID NO:66), or RASKSVSTSGYSYLN (SEQ ID NO:67); a CDR-L2 including the amino acid sequence LASNLES (SEQ ID NO: 60), LASNLA (SEQ ID NO:68), LASNLAT (SEQ ID NO:63), LASNLQ (SEQ ID NO:69), LASNLQS (SEQ ID NO:64), LAST
• next amino acid residues following the CDR-L3 sequence QHSRELPFT (SEQ ID NO:61 ) in the protein may, for example, be FGQ.
• a further aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45-binding antibody fragment (such as Fab fragment, Fab2 fragment, or scFv molecule) or an immunoglobulin heavy chain, including an antibody heavy chain variable region including the following light chain CDRs: a CDR-H1 including the amino acid sequence GFDFSRYWMS (SEQ ID NO:53) or GFDFSRYWMN (SEQ ID NO: 85); a CDR-H2 including the amino acid sequence EINPTSSTINFTPSLKD (SEQ ID NO:54), EINPTSSTINFADSVKG (SEQ ID NO:56), EINPTS STINY ADS VKG (SEQ ID NO:57), EINPTSSTINFVDSVKG (SEQ ID NO:58), YINPTSSTIYYADSVKG (SEQ ID NO:74), AINPTSSTIYYADSVKG (SEQ ID NO:75), NINPTSSTIYYVDSVKG (SEQ ID NO:
• Still another aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45-binding antibody fragment (such as Fab fragment, Fab2 fragment, or scFv molecule), including:
• an antibody light chain variable region including the following light chain CDRs: a CDR-L1 including the amino acid sequence RASKSVSTSGYSYLH (SEQ ID NO:59), KSSKSVSTSGYSYLH (SEQ ID NO:62), RASKSVSTSGYSYLA (SEQ ID NO:65), RASKSVSTSGYSYLS (SEQ ID NO:66), or RASKSVSTSGYSYLN (SEQ ID NO:67); a CDR-L2 including the amino acid sequence LASNLES (SEQ ID NO: 60), LASNLA (SEQ ID NO:68), LASNLAT (SEQ ID NO:63), LASNLQ (SEQ ID NO:69), LASNLQS (SEQ ID NO:64), LASTRES (SEQ ID NO:70), LASTRAT (SEQ ID NO:71), LASNRAT (SEQ ID NO:72), or LASSQLS (SEQ ID NO:73); and a CDR-L3 including the ammo acid
• an antibody heavy chain variable region including the following heavy chain CDRs: a CDR-H1 including the amino acid sequence GFDFSRYWMS (SEQ ID NO:53) or GFDFSRYWMN (SEQ ID NO: 85); a CDR-H2 including the amino acid sequence EINPTSSTINFTPSLKD (SEQ ID NO:54), EINPTSSTINFADSVKG (SEQ ID NO:56), EINPTS STINY ADS VKG (SEQ ID NO:57), EINPTSSTINFVDSVKG (SEQ ID NO:58), YINPTSSTIYYADSVKG (SEQ ID NO:74), AINPTSSTIYYADSVKG (SEQ ID NO:75), NINPTSSTIYYVDSVKG (SEQ ID NO:76), or SINPTSSTIYYADSVKG (SEQ ID NO:77); and a CDR-H3 including the amino acid sequence GNYYRYGDAMDY (SEQ ID NO:55), provided that the combination of CDR-LI including the amino acid
• next amino acid residues following the CDR-L3 sequence QHSRELPFT (SEQ ID NO:61) in the protein may, for example, be FGQ.
• a further aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45-binding antibody fragment (such as Fab fragment, Fab2 fragment, or scFv molecule) or an immunoglobulin light chain, including an antibody light chain variable region including the following light chain CDRs: a CDR-L1 including the amino acid sequence RASKSVSTSGYSYLH (SEQ ID NO:59) or KSSKSVSTSGYSYLH (SEQ ID NO:62); a CDR-L2 including the amino acid sequence LASNLA (SEQ ID NO:68), LASNLAT (SEQ ID NO:63), LASNLQ (SEQ ID NO:69), or LASNLQS (SEQ ID NO: 64); and a CDR-L3 including the amino acid sequence QHSRELPFT (SEQ ID NO:61).
• the next amino acid residues following the CDR-L3 sequence QHSRELPFT (SEQ ID NO:61) in the protein may, for example, be FGQ.
• Another aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45-binding antibody fragment (such as Fab fragment, Fab2 fragment, or scFv molecule) or an immunoglobulin heavy chain, including an antibody heavy chain variable region including the following heavy chain CDRs: a CDR-H1 including the amino acid sequence GFDFSRYWMS (SEQ ID NO:53); a CDR-H2 including the amino acid sequence EINPTSSTINFADSVKG (SEQ ID NO:56), EINPTSSTINYADSVKG (SEQ ID NO:57), or EINPTSSTINFVDSVKG (SEQ ID NO:58); and a CDR-H3 including the amino acid sequence GNYYRYGDAMDY (SEQ ID NO:55).
• an anti-CD45 antibody or CD45-binding antibody fragment such as Fab fragment, Fab2 fragment, or scFv molecule
• an immunoglobulin heavy chain including an antibody heavy chain variable region including the following heavy chain CDRs: a C
• a still further aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45-binding antibody fragment (such as Fab fragment, Fab2 fragment, or scFv molecule), including:
• an antibody light chain variable region including the following light chain CDRs: a CDR-L1 including the amino acid sequence RASKSVSTSGYSYLH (SEQ ID NO:59) or KSSKSVSTSGYSYLH (SEQ ID NO:62); a CDR-L2 including the amino acid sequence LASNLES (SEQ ID NO: 60), LASNLA (SEQ ID NO:68), LASNLAT (SEQ ID NO:63), LASNLQ (SEQ ID NO:69), LASNLQS (SEQ ID NO:64); and a CDR-L3 including the amino acid sequence QHSRELPFT (SEQ ID N0:61); and
• an antibody heavy chain variable region including the following heavy chain CDRs: a CDR-H1 including the amino acid sequence GFDFSRYWMS (SEQ ID NO:53); a CDR-H2 including the amino acid sequence EINPTSSTINFTPSLKD (SEQ ID NO:54), EINPTSSTINFADSVKG (SEQ ID NO:56), EINPTS STINY ADS VKG (SEQ ID NO:57), or EINPTS STINFVDS VKG (SEQ ID NO:58); and a CDR-H3 including the amino acid sequence GNYYRYGDAMDY (SEQ ID NO:55), provided that the combination of CDR-L1 including the amino acid sequence RASKSVSTSGYSYLH (SEQ ID NO: 59), CDR-L2 including the amino acid sequence LASNLES (SEQ ID NO: 60), CDR-L3 including the amino acid sequence QHSRELPFT (SEQ ID NO:61), CDR-H1 including the amino acid sequence GFDFSRYWMS (SEQ ID NO
• the next amino acid residues following the CDR-L3 sequence QHSRELPFT (SEQ ID NO:61) in the protein may, for example, be FGQ.
• the CDR-H2 may, for example, include the amino acid sequence EINPTSSTINFADSVKG (SEQ ID NO:56),
• EINPTS STINYADS VKG (SEQ ID NO 57), or EINPTS STINFVDS VKG (SEQ ID NO:58).
• One aspect of the invention provides an immunoglobulin heavy chain variable region or a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab2 or scFv molecule, including an immunoglobulin heavy chain variable region sequence that includes one or more of the amino acid substitutions disclosed in any of the non- parental immunoglobulin heavy chain variable regions disclosed herein versus the parental immunoglobulin heavy chain variable region disclosed herein, in any combination, but otherwise includes the same amino acid sequence as the parental immunoglobulin heavy chain variable region sequence.
• One aspect of the invention provides an immunoglobulin light chain variable region or a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab2 or scFv molecule, including an immunoglobulin light chain variable region that includes one or more of the amino acid substitutions disclosed in any of the non-parental immunoglobulin light chain variable regions disclosed herein versus the parental immunoglobulin light chain variable region disclosed herein, in any combination, but otherwise includes the same amino acid sequence as the parental immunoglobulin light chain variable region sequence.
• One aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab 2 or scFv molecule, including:
• an immunoglobulin heavy chain variable region that includes one or more of the amino acid substitutions disclosed in any of the non-parental immunoglobulin heavy chain variable regions disclosed herein versus the parental immunoglobulin heavy chain variable region disclosed herein, in any combination, but otherwise includes the same amino acid sequence as the parental immunoglobulin heavy chain variable region sequence;
• an immunoglobulin light chain variable region that includes one or more of the amino acid substitutions disclosed in any of the non-parental immunoglobulin light chain variable regions disclosed herein versus the parental immunoglobulin light chain variable region disclosed herein, in any combination, but otherwise includes the same amino acid sequence as the parental immunoglobulin light chain variable region sequence.
• One aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab2 or scFv molecule, including:
• the parental immunoglobulin light chain variable region disclosed herein or an immunoglobulin light chain variable region that includes one or more of the amino acid substitutions disclosed in any of the non-parental immunoglobulin light chain variable regions disclosed herein versus the parental immunoglobulin light chain variable region disclosed herein, in any combination, but otherwise includes the same amino acid sequence as the parental immunoglobulin heavy chain variable region sequence. provided that the protein does not include both the parental immunoglobulin heavy chain variable region disclosed herein and the parental immunoglobulin light chain variable region disclosed herein.
• the protein does not include the parental immunoglobulin heavy chain variable region disclosed herein and does not include the parental immunoglobulin light chain variable region disclosed herein.
• One aspect of the invention provides an immunoglobulin heavy chain variable region or a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab2 or scFv molecule, including an immunoglobulin heavy chain variable region sequence that includes the amino acid sequence: EVKLLESGGGLVOPGGSLKLSCAASGFDFSRYWMX1WVROAPGKGLEWX2X3X4INP TSSTIX 5 X 6 X 7 X 8 SLKX 9 X 10 X 11 X 12 ISRDNX 13 KNX 14 LYLQMSX 15 X 16 RX 17 EDTAX 18 YYC A RGNYYRYGDAMDYWGOGTX19VTVSS (SEQ ID NO:78), wherein
• X 1 is S or N
• X 2 is I or V
• X3 is G, S or A
• X 4 is E, Y, A, N, or S,
• X 5 is N or Y
• X 6 is F or Y
• X 7 is T, A, or V
• X 8 is P or D
• X 9 is D or G
• X 10 is K or R
• X 11 is V or F
• X 12 is F or T
• X 13 is A or S
• X 14 is T or S
• X 15 is K or S
• X 16 is V or L
• X 17 is S or A
• X 18 is L or V
• X 19 is S or M, provided that the amino acid sequence does not include the sequence EVKLLESGGGLVQPGGSLKLSCAASGFDFSRYWMSWVROAPGKGLEWIGEINPTSST INFTPSLKDKVFISRDNAKNTLYLOMSKVRSEDTALYYCARGNYYRYGDAMDYWG QGTSVTVSS (SEQ ID NO:2).
• the heavy chain variable region amino acid sequence of this aspect may be referred to herein as “the Modified Heavy Chain Variable Region Sequence” or the “M.H.C.V.R. Sequence”.
• One aspect of the invention provides an immunoglobulin light chain variable region or a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab2 or scFv molecule, including an immunoglobulin light chain variable region sequence that includes the amino acid sequence: DIX L1 X L2 TQSPX L3 X L4 LX L5 X L6 SX L7 GX L8 RX L9 TXL 10 X L11 CX L32 X L13 SKSVSTSGYSYLX L14 WYQQKPGQX L1 5 PX L16 LLIYLASX L17 X L18 X L19 X L20 GX L21 PX L22 RFSGSGSGTDFTLX L23 IX L24 X L25 X L26 X L27 X L28 EDX L29 AX L30 YYCQHSRELPFTFGX L31 GTKLEIK (SEQ ID NO: 79), wherein
• X L1 is D or E
• X L2 is A or V or Q
• X L3 is L or M
• X L4 is A or D or S
• X L5 is S or T
• X L6 is A or S
• X L7 is V or L or A
• X L8 is L or P or V
• XL9 is Q or E or D
• X L10 is A or V
• X L11 is I or L
• X L12 is S or N or T
• X L13 is A or S
• X L14 is H, A , S, orN,
• X L15 is P or A
• X L16 is K or R
• X L17 is N or T or S
• X L18 is L or R
• X L19 is E or A or Q
• X L20 is S or T
• X L21 is V or I
• X L22 is A or D or S
• X L23 is N or T
• X L24 is H or S
• X L25 is P or S
• X L26 is V or L
• X L27 is E or Q
• X L28 is E or A or P
• X L29 is A or V or F
• X L30 is T or V
• X L31 is S or Q
• X L32 is R or K provided that the amino acid sequence does not include the sequence DIALTQSPASLAVSLGORATISCRASKSVSTSGYSYLHWYOQKPGOPPKLLIYLASNL ESGVPARFSGSGSGTDFTLNIHPVEEEDAATYYCQHSRELPFTFGSGTKLEIK (SEQ ID NO:28).
• the light chain variable region amino acid sequence of this aspect may be referred to herein as “the Modified Light Chain Variable Region Sequence” or the “M.L.C.V.R. Sequence”.
• One aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab2 or scFv molecule, including:
• One aspect of the invention provides a protein, such as an anti-CD45 antibody or CD45 binding antibody fragment such as a Fab, Fab2 or scFv molecule, including:
• One aspect of the invention provides a protein, such as a CD45 binding scFv molecule or a protein including at least one scFv segment, that includes a consecutive (amino to carboxy terminal order) amino acid sequence that includes amino acids 1-120 (the amino acids through and including the sequence VTVS or corresponding amino acid positions) or amino acids 1-121 of a heavy chain variable region as disclosed herein, followed by a linker amino acid sequence, followed by the amino acid sequence of a light chain variable region disclosed herein, provided that the protein does not include both amino acids 1-120 of the parental heavy chain variable region sequence disclosed herein and the parental light chain variable region sequence disclosed herein.
• the protein does not include either of amino acids 1-120 of the parental heavy chain variable region sequence disclosed herein and the parental light chain variable region sequence disclosed herein.
• linker amino acid sequence may, for example, include any of the amino acid sequences:
• (G3S) n where, for example, n is 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, such as (G3S)4, i.e., GGGSGGGSGGGSGGGS (SEQ ID NO:82); or
• (G4S)n i.e., (GGGGS [SEQ ID NO: 83]) n where, for example, n is 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, such as (G4S) 5 , i.e., GGGGSGGGGSGGGGSGGGGSGGGGS,(SEQ ID NO: 84).
• the heavy chain variable region and light chain variable regions disclosed herein each include three (3) complementarity determining regions (CDRs).
• CDRs complementarity determining regions
• the CDRs are surrounded by immunoglobulin framework regions (FRs) in the following manner: FR1 is the amino acid sequence preceding (N-terminal to) CDR1, FR2 is the amino acid sequence between CDR1 and CDR2, FR3 is the amino acid sequence between CDR2 and CDR3, and FR4 is the amino acid sequence following (C -terminal to) CDR3 to the end of the variable region sequence.
• FR1 is the amino acid sequence preceding (N-terminal to) CDR1
• FR2 is the amino acid sequence between CDR1 and CDR2
• FR3 is the amino acid sequence between CDR2 and CDR3
• FR4 is the amino acid sequence following (C -terminal to) CDR3 to the end of the variable region sequence.
• antibody fragment includes without limitation proteolytic fragments of antibodies, such as Fab or Fab2 (F(ab')z) fragments, recombinant antibody fragments with covalently associated or non-covalently associated chains, scFv molecules, and rlgG fragments ("rlgG” refers to reduced IgG (-75,000 daltons)) also known as half-IgG.
• the proteins may, for example, be linked directly or indirectly, via a chemically conjugated chelator, to a radionuclide, for example, to target cytotoxic radiation to CD45-expressing cells in mammalian subject such as ahuman patient, or to non-cytotoxically image CD45-expression in a mammalian subject such as a human patient.
• a radionuclide for example, to target cytotoxic radiation to CD45-expressing cells in mammalian subject such as ahuman patient, or to non-cytotoxically image CD45-expression in a mammalian subject such as a human patient.
• the antibody may be directly labeled with 131 I according to the methods disclosed in U.S. Patent No. 10,420,851 or the antibody may be chemically conjugated to a chelator, such as p-SCN-DOTA and labeled with a radionuclide 225 Ac, according to the procedures described in U.S. Patent No. 9,603,954.
• the radionuclide may, for example, be selected from 131 I, 125 I, 123 I, 32 P, 213 Po, 134 Ce, 43 Sc, 44 Sc, 47 Sc, 55 Co, 60 Cu, 61 Cu, 62 Cu, 64 Cu, 67 Cu, 66 Ga, 67 Ga, 68 Ga, 82 Rb, 86 Y, 87 Y, 90 Y, 89 Zr, 97 RU, 105 Rh, 109 Pd, i n In, 117m Sn, 149 Pm, 149 Tb, 161 Tb, 153 Sm, 177 Lu, 186 Re, 188 Re, 199 Au, 2O1 T1, 137 CS, 223 Ra, 203 Pb, 212 Pb, 211 At, 212 BI, 213 BI, 225 AC, and 227 Th.
• the chelator group in the various aspects of the invention may, for example, include: 1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid (DO3A) or a derivative thereof; 1,4,7-triazacyclononane-1,4-diacetic acid (NODA) or a derivative thereof; 1,4,7- triazacyclononane-1,4,7-triacetic acid (NOTA) or a derivative thereof; 1,4,7,10- tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) or a derivative thereof; 1,4,7- triazacyclononane, 1 -glutaric acid-4, 7-diacetic acid (NODAGA) or a derivative thereof;
• DO3A 1,4,7-triazacyclononane-1,4-diacetic acid
• NOTA 1,4,7- triazacyclononane-1,4,7-triacetic acid
• DOTA 1,4,7- tri
• the proteins may, for example, be linked to one or more cytotoxic drugs to target and deplete CD45-expressing cells in a mammalian subject such as a human patient.
• ADC antibody-drug-conjugate
• the ADC may, for example, be a conjugate with a cytotoxin containing a benzodiazepine moiety, for example, a pyrrolobenzodiazepine (PBD) or an indolinobenzodiazepine (I GN) moiety, as disclosed in U. S. Pub. No. 20220175951.
• compositions including a radiolabeled antibody may include one or more pharmaceutically acceptable carriers or pharmaceutically acceptable excipients.
• Such carriers are well known to those skilled in the art.
• injectable drug delivery systems include solutions, suspensions, gels, microspheres and polymeric injectables, and can include excipients such as solubility-altering agents (e.g., ethanol, propylene glycol and sucrose) and polymers (e g., polycaprylactones and PEGA's).
• solubility-altering agents e.g., ethanol, propylene glycol and sucrose
• polymers e g., polycaprylactones and PEGA's.
• An exemplary formulation may be as substantially described in U.S. Patent 10,420,851 or International Pub. No. WO 2017/155937, incorporated by reference herein.
• the formulation may include 0.5% to 5.0% (w/v) of an excipient selected from the group consisting of ascorbic acid, polyvinylpyrrolidone (PVP), human serum albumin (HSA), a water-soluble salt of HSA, and mixtures thereof.
• an excipient selected from the group consisting of ascorbic acid, polyvinylpyrrolidone (PVP), human serum albumin (HSA), a water-soluble salt of HSA, and mixtures thereof.
• Certain formulations may include 0.5-5% ascorbic acid; 0.5-4% polyvinylpyrrolidone (PVP); and the monoclonal antibody in 50 mM PBS buffer, pH 7.
• the humanized and various anti-huCD45 antibodies disclosed herein may, for example, be labeled with a radionuclide, such as 133 I, 177 Lu, 211 At, 227 Th or 225 Ac, or conjugated to a cytotoxic drug, for use as a conditioning agent in preparation of a bone marrow transplant (BMT) or of a hematopoietic stem cell transplant (HSCT), for example, for the treatment of a hematological cancer, or in preparation of administration of a genetically engineered cell therapy such as a CAR-T therapy for the treatment of a cancer, or for use as a direct treatment of a hematological cancer, such as a myeloid or lymphoid hematological cancer, such as a leukemia, for example acute myeloid leukemia (AML), or a lymphoma, for example non- Hodgkin lymphoma (NHL), or for use as an immunological resetting agent in the treatment of an autoimmune disease such
• the hematological cancer or disorder treated may, for example, be a leukemia (such as acute myeloid leukemia (AML), acute promyelocytic leukemia, acute lymphoblastic leukemia (ALL), acute mixed lineage leukemia, chronic myeloid leukemia (CML), chronic lymphocytic leukemia (CLL), hairy cell leukemia, or large granular lymphocytic leukemia), myelodysplastic syndrome (MDS), a myeloproliferative disorder (such as polycythemia vera, essential thrombocytosis, primary myelofibrosis or chronic myeloid leukemia), multiple myeloma, MGUS and similar disorders, a lymphoma (such as Hodgkin's lymphoma (HL), non-Hodgkin lymphoma (NHL), primary mediastinal large B-cell lymphoma, diffuse large B-cell lymphoma, follicular lymphoma, transformed folli
• the radiolabeled or drug- conjugated anti-huCD45 antibody is administered as a maintenance therapy to a subject who previously received a BMT or HSCT in treatment of a hematological cancer such as AML or another described herein, for example, to treat or to prevent a relapse or recurrence of the cancer.
• a hematological cancer such as AML or another described herein, for example, to treat or to prevent a relapse or recurrence of the cancer.
• the subject may be a mammal such as a human patient.
• Example 1 Production of a radiolabeled chelator-conjugated anti-huCD45 antibody
• a vial of lyophilized p-SCN-Bn-DOTA is reconstituted with metal-free water to a concentration of 10 mg/ml.
• 0.02 ml of ascorbic acid solution (150 mg/ml) and 0.05 ml of reconstituted p-SCN-Bn- DOTA are added and the pH adjusted to between 5 and 5.5 with 2M tetramethylammonium acetate (TMAA). The mixture is then heated at 55 ⁇ 4°C for 30 minutes.
• TMAA tetramethylammonium acetate
• the final product may be purified by size exclusion chromatography using 10DG resin and eluted with 2 ml of 1% HSA.
• Radiolabeling may be conjugated to a linker, such as any of the linkers described in the above indicated patent applications.
• An exemplary linker includes at least dodecane tetraacetic acid (DOTA), wherein agoal of the conjugation reaction is to achieve a DOTA-antibody ratio of 3: 1 to 5: 1.
• Chelation with the radionuclide, such as 177 Lu, 90 Y, or 225 AC may then be performed and efficiency and purity of the resulting radiolabeled antibody, such as an anti-CD45 antibody, may be determined by HPLC and iTLC.
• 3 pL of a ImM DTPA solution may be added to the reaction mixture and incubated at room temperature for 20 min to bind the unreacted 225 Ac into the 225 Ac-DTPA complex.
• Instant thin layer chromatography with 10cm silica gel strip and lOmM EDTA/normal saline mobile phase may be used to determine the radiochemical purity of 225 Ac-DOTA-anti-CD45 through separating 225 Ac-labeled anti-CD45 ( 225 Ac-DOTA-anti-CD45) from free 225 Ac ( 225 Ac-DTPA). In this system, the radiolabeled antibody stays at the point of application and 225 Ac-DTPA moves with the solvent front.
• An exemplary radiolabeled targeting agent such as 225 Ac-DOTA- antibody, may be purified either on PD10 columns pre-blocked with 1% HSA or on Vivaspin centrifugal concentrators with a 50 kDa MW cut-off with 2 x 1.5 mL washes, 3 min per spin.
• Example 2 Radio-iodination of anti-huCD45 antibody and purification in the presence of Ascorbic acid
• Anti-CD45 antibodies may be radio-iodinated according to the following method.
• an anti-CD45 antibody is labeled with 20 to 30 mCi of 131 I — Na (30 mCi) in the presence of chloramine-T (23 micrograms) in PBS buffer (pH 7.2). The reaction is quenched with the addition of aqueous sodium thiosulfate (69 micrograms) and diluted with cold Nal (1 mg). Immediately following, a concentrated ascorbic acid solution made in 50 mM PBS (pH 7) is added to achieve 2.5% (w/v) ascorbic acid strength in the quenched reaction mixture. Labeling reactions up to 3,000 mCi per batch may, for example, be successfully performed using this method.
• the radiolabeled antibody such as radiolabeled immunoglobulin
• the radiolabeled antibody can be purified by gel filtration on a sterile, pre-packed commercially available Sephadex G25 column (GE HiPrep 26/10 column, bed volume 53 mL) using PBS (50 mM, pH 7) mobile phase supplemented with 2.5% (w/v) ascorbic acid to stabilize the radiolabeled product.
• PBS 50 mM, pH 7
• mobile phase supplemented with 2.5% (w/v) ascorbic acid
• Up to 1,000 mCi reaction volume can be purified on a single column.
• the product can be collected in a 5 to 35 mL elution volume from the column.
• Radio-iodinated reaction batches of ⁇ 200 mCi may be purified in a similar fashion on a smaller desalting column (GE PD10 column, bed volume 8.6 mL).
• Example 3 Radio-iodination of anti-CD45 immunoglobulin and purification in the presence of Ascorbic acid and HSA
• the radio-iodination and purification may be performed essentially as described in Example 2, except that 2% or 4% (w/v) HSA is also added along with 2.5% (w/v) ascorbic acid to the quenched reaction as well as in the elution buffer during the purification process.

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