US20140273092A1 - Manufacturing methods to control c-terminal lysine, galactose and sialic acid content in recombinant proteins - Google Patents

Manufacturing methods to control c-terminal lysine, galactose and sialic acid content in recombinant proteins Download PDF

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US20140273092A1
US20140273092A1 US14/207,915 US201414207915A US2014273092A1 US 20140273092 A1 US20140273092 A1 US 20140273092A1 US 201414207915 A US201414207915 A US 201414207915A US 2014273092 A1 US2014273092 A1 US 2014273092A1
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antibody
zinc
concentration
culture medium
edta
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Marcel Flikweert
Charles Goochee
Francis Maslanka
Franciscus Johannes Ignatius Nagel
James Ryland
Eugene Schaefer
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Janssen Biologics BV
Janssen Biotech Inc
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/24—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against cytokines, lymphokines or interferons
    • C07K16/241—Tumor Necrosis Factors
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/10—Immunoglobulins specific features characterized by their source of isolation or production
    • C07K2317/14—Specific host cells or culture conditions, e.g. components, pH or temperature
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
    • C07K2317/21—Immunoglobulins specific features characterized by taxonomic origin from primates, e.g. man
    • 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
    • C07K2317/40—Immunoglobulins specific features characterized by post-translational modification
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/40—Immunoglobulins specific features characterized by post-translational modification
    • C07K2317/41—Glycosylation, sialylation, or fucosylation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/52—Constant or Fc region; Isotype
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/54—F(ab')2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/55—Fab or Fab'
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding
    • 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

  • CTL C-terminal lysine
  • infliximab endogenous circulating carboxypeptidases in the blood stream
  • CTL content in recombinant proteins having CTL residues can be used as a measure of manufacturing consistency and product homogeneity.
  • sialic acid content in recombinant proteins has been associated with many phenomena of physiological importance in humans.
  • the presence of sialic acid in glycoproteins, such as erythropoietin promotes a long circulatory half-life, while the absence of sialic acid in erythropoietin leads to rapid clearance of the protein from circulation.
  • increased sialic acid content in proteins may modulate immunogenicity of the protein in humans. Due to the importance of sialic acid in product safety and efficacy, sialic acid content should be kept within a range reflective of the range used in the clinic.
  • an anti-tumor necrosis factor alpha (TNF ⁇ ) antibody such as monoclonal antibody cA2 (also referred to herein as infliximab), having a desired C-terminal lysine (CTL) content, sialic acid content, galactose content and/or ratio of sialic acid to galactose by controlling culture conditions, including zinc concentration, ethylenediaminetetraacetic acid (EDTA) concentration and harvest time.
  • TNF ⁇ anti-tumor necrosis factor alpha
  • cA2 also referred to herein as infliximab
  • CTL C-terminal lysine
  • sialic acid content sialic acid content
  • galactose content galactose content
  • ratio of sialic acid to galactose by controlling culture conditions, including zinc concentration, ethylenediaminetetraacetic acid (EDTA) concentration and harvest time.
  • EDTA ethylenediaminetetraacetic acid
  • One embodiment of the invention is a method for producing an antibody having a C-terminal lysine content of about 20% to about 70%, and a sialic acid content of about 1% to about 20%, the method comprising culturing a zinc-responsive host cell transfected with DNA encoding the antibody in a culture medium comprising at least 0.5 ⁇ M zinc; and controlling the concentration of zinc in the culture medium, thereby producing the antibody.
  • the C-terminal lysine content of the antibody is about 40% to about 70%, e.g., about 55% to about 65%, e.g., or about 60%.
  • the sialic acid content of the antibody is about 3% to about 14%.
  • the antibody has a galactose content of about 50% to about 90%, or about 45% to about 85%.
  • the antibody has a ratio of sialic acid to galactose of about 0.05 to about 0.20.
  • the antibody is an anti-TNF ⁇ antibody or antigen-binding fragment thereof, wherein said anti-TNF ⁇ antibody or antigen-binding fragment thereof (i) competitively inhibits binding of A2 (ATCC Accession No. PTA-7045) to human TNF ⁇ ; and (ii) binds to a neutralizing epitope of human TNF ⁇ with an affinity of at least 1 ⁇ 10 8 liter/mole, measured as an association constant (Ka).
  • the anti-TNF ⁇ antibody or antigen-binding fragment thereof can be, e.g., a chimeric antibody, a human antibody, or a humanized antibody.
  • the anti-TNF ⁇ antibody or antigen-binding fragment thereof can be of immunoglobulin class IgG1, IgG2, IgG3, IgG4 or IgM and, in some embodiments, comprises an IgG1 constant region.
  • the anti-TNF ⁇ antibody or antigen-binding fragment thereof is selected from the group consisting of Fab, Fab′, F(ab′) 2 and Fv.
  • the anti-TNF ⁇ antibody or antigen-binding fragment thereof comprises a human constant region and a non-human variable region, or a human constant region and a human variable region.
  • the antibody or antigen-binding fragment thereof comprises at least one human light chain and at least one human heavy chain.
  • the light chain comprises all antigen-binding regions of the light chain of A2 (ATCC Accession No. PTA-7045).
  • the heavy chain comprises all antigen-binding regions of the heavy chain of A2 (ATCC Accession No. PTA-7045).
  • the light chain comprises all antigen-binding regions of the light chain of A2 (ATCC Accession No. PTA-7045) and the heavy chain comprises all antigen-binding regions of the heavy chain of A2 (ATCC Accession No. PTA-7045).
  • the anti-TNF ⁇ antibody or antigen-binding fragment thereof comprises an IgG1 human constant region and a non-human variable region comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 3 and SEQ ID NO: 5, or encoded by a nucleic acid sequence selected from the group consisting of SEQ ID NO: 2 and SEQ ID NO: 4.
  • the anti-TNF ⁇ antibody or antigen-binding fragment thereof has epitopic specificity identical to monoclonal antibody cA2 and, in some embodiments, the anti-TNF ⁇ antibody or antigen-binding fragment thereof is monoclonal antibody cA2.
  • the concentration of zinc in the culture medium is in the range of about 0.6 ⁇ M to about 6.5 ⁇ M, or about 0.6 ⁇ M to about 1.1 ⁇ M.
  • the culture medium further comprises EDTA in a concentration range of about 2.5 ⁇ M to about 30 ⁇ M, or about 5 ⁇ M to about 16 ⁇ M, and the method further comprises controlling the concentration of EDTA in the culture medium.
  • the method further comprises recovering the antibody, for example, when the zinc-responsive host cells in the culture medium reach a cell density of about 1.5 million cells per mL to about 11 million cells per mL, or about 3 million cells per mL to about 11 million cells per mL.
  • the concentration of zinc is controlled until the antibody is recovered, or during an exponential growth phase of the zinc-responsive host cells.
  • controlling the concentration of zinc comprises monitoring the concentration of zinc in the culture medium, and regulating the concentration of zinc in the culture medium, such that the concentration of zinc in the culture medium is at least 0.5 ⁇ M or in the range of about 0.6 ⁇ M to about 6.5 ⁇ M.
  • the zinc-responsive host cell is an SP2/0 cell.
  • Another embodiment of the invention is a method for controlling C-terminal lysine content of an antibody having a C-terminal lysine content of about 20% to about 70%, in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • Yet another embodiment of the invention is a method for controlling sialic acid content of an antibody having a sialic acid content of about 1% to about 20% in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • Yet another embodiment of the invention is a method for controlling galactose content of an antibody having a galactose content of about 50% to about 90% in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • Yet another embodiment of the invention is a method for controlling the ratio of sialic acid to galactose in an antibody having a ratio of sialic acid to galactose of about 0.05 to about 0.20 in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • the antibody is an anti-TNF ⁇ antibody or antigen-binding fragment thereof, and/or the antibody is biosynthesized by an SP2/0 cell.
  • the antibody is a mAb which binds amino acids of an epitope of TNF, which is produced by a hybridoma or by a recombinant host.
  • the antibody is a chimeric antibody which recognizes an epitope recognized by A2.
  • the antibody is a chimeric antibody designated as chimeric A2 (cA2) (i.e., infliximab).
  • the antibodies include murine mAb A2, which is produced by a cell line designated c134A and chimeric antibody cA2, which is produced by a cell line designated c168A.
  • Cell line c134A is stored at Janssen Research & Development, Welsh & McKean Road, Springhouse, Pa.
  • Cell line c168A is stored at Janssen Research & Development, 200 Great Valley Parkway, Malvern, Pa., 19355, Janssen Biologics BV, Leiden, The Netherlands.
  • the methods disclosed herein can be used to improve batch homogeneity in, for example, a commercial manufacturing process, such as the manufacturing process used to produce infliximab, a monoclonal anti-TNF ⁇ antibody used in the treatment of, for example, autoimmune diseases in humans.
  • FIG. 1 shows a capillary isoelectric focusing (cIEF) electropherogram of a sample of infliximab.
  • cIEF capillary isoelectric focusing
  • FIG. 2 is a fitted line plot of percentage of des-lysine (% lacking C-terminal lysine, abbreviated des-Lys) from reverse phase peptide mapping as a function of percentage of cIEF Peak 1, and shows the correlation between CTL content (expressed as percentage of des-Lys) and the percentage of Peak 1.
  • FIG. 3 is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying Zn +2 concentrations on CTL removal.
  • Y-axis % desl-Lys;
  • X-axis bioreactor age in days.
  • FIG. 4 is a graph of percentage of infliximab oligosaccharides with sialic acid, as determined by the WAX method, as a function of bioreactor age, and shows the effect of varying Zn +2 concentrations on the percentage of sialic acid.
  • Y-axis % sialic acid;
  • X-axis bioreactor age in days.
  • FIG. 5 is a graph of viable cell density as a function of bioreactor age, and shows the effect of varying Zn +2 concentrations on the viable cell density.
  • Y-axis viable cell density (millions of viable cells/mL);
  • X-axis bioreactor age in days.
  • FIG. 6 is a graph of percentage of viable cells as a function of bioreactor age, and shows the effect of varying Zn +2 concentrations on the culture viability.
  • Y-axis % viable cells
  • X-axis bioreactor age in days.
  • FIG. 7 is a graph of infliximab concentration as a function of bioreactor age, and shows the effect of varying Zn +2 concentrations on the concentration of infliximab.
  • the y-axis concentration mg/mL as indicated contains a a typographical error. The concentration is mg/L.
  • Y-axis infliximab concentration (mg/L)
  • X-axis bioreactor age in days.
  • FIG. 8A is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on CTL removal in the presence of 0.76 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5 Zn:1 EDTA:10” was 6.3 ⁇ M, rather than 0.76 ⁇ M; the targeted concentration of 0.76 ⁇ M Zn +2 was implemented from Day 13 until the end of the experiment).
  • Y-axis % desl-Lys;
  • X-axis bioreactor age in days.
  • FIG. 8B is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on CTL removal in the presence of 1.7 ⁇ M Zn +2 .
  • Y-axis % desl-Lys;
  • X-axis bioreactor age in days.
  • FIG. 9A is a graph of percentage of infliximab oligosaccharides with sialic acid, as determined by the WAX method, as a function of bioreactor age, and shows the effect of varying EDTA concentrations on the percentage of sialic acid in the presence of 0.76 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5 Zn:1 EDTA:10” was 6.3 ⁇ M, rather than 0.76 ⁇ M; the targeted concentration of 0.76 ⁇ M Zn +2 was implemented from Day 13 until the end of the experiment).
  • Y-axis % sialic acid
  • X-axis bioreactor age in days.
  • FIG. 9B is a graph of percentage of infliximab oligosaccharides with sialic acid, as determined by the WAX method, as a function of bioreactor age, and shows the effect of varying EDTA concentrations on sialic acid content in the presence of 1.7 ⁇ M Zn +2 .
  • Y-axis % sialic acid;
  • X-axis bioreactor age in days.
  • FIG. 9C is a graph of percentage of G0F (WAX Component 1) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on the percentage of non-galactosylated species in the presence of 0.76 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5 Zn:1 EDTA:10” was 6.3 ⁇ M, rather than 0.76 ⁇ M; the targeted concentration of 0.76 ⁇ M Zn +2 was implemented from Day 13 until the end of the experiment).
  • FIG. 9D is a graph percentage of G0F (WAX Component 1) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on the percentage of non-galactosylated species in the presence of 1.7 ⁇ M Zn +2 .
  • FIG. 10 is a graph of viable cell density as a function of bioreactor age, and shows the effect of varying EDTA concentrations on viable cell density in the presence of 0.76 ⁇ M Zn +2 or 1.7 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5 Zn:1 EDTA:10” was 6.3 ⁇ M, rather than 0.76 ⁇ M; the targeted concentration of 0.76 ⁇ M Zn +2 was implemented from Day 13 until the end of the experiment).
  • Y-axis viable cell density (millions of viable cells/mL);
  • X-axis bioreactor age in days.
  • FIG. 11A is a graph of percentage of viable cells as a function of bioreactor age, and shows the effect of varying EDTA concentrations on culture viability in the presence of 0.76 ⁇ M Zn +2 or 1.7 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5 Zn:1 EDTA:10” was 6.3 ⁇ M, rather than 0.76 ⁇ M; the targeted concentration of 0.76 ⁇ M Zn +2 was implemented from Day 13 until the end of the experiment).
  • Y axis % viable cells
  • X-axis bioreactor age in days.
  • FIG. 11B is an enlargement of Days 0-25 of the graph shown in FIG. 11A .
  • Y-axis viable cell density (millions of viable cells/mL);
  • X-axis bioreactor age in days.
  • FIG. 12A is a graph of infliximab concentration as a function of bioreactor age, and shows the effect of varying EDTA concentrations on the concentration of infliximab in the presence of 0.76 ⁇ M Zn +2 or 1.7 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5 Zn:1 EDTA:10” was 6.3 ⁇ M, rather than 0.76 ⁇ M; the targeted concentration of 0.76 ⁇ M Zn +2 was implemented from Day 13 until the end of the experiment).
  • the y-axis concentration mg/mL as indicated contains a a typographical error. The concentration is mg/L.
  • Y-axis infliximab concentration (mg/L)
  • X-axis bioreactor age in days.
  • FIG. 12B is an enlargement of Days 0-25 of the graph shown in FIG. 12A .
  • the y-axis concentration mg/mL as indicated contains a typographical error. The concentration is mg/L.
  • Y-axis infliximab concentration (mg/L),
  • X-axis bioreactor age in days.
  • FIG. 13A is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on CTL removal (results are presented as an average from two duplicate bioreactors).
  • Y-axis % desl-Lys;
  • X-axis bioreactor age in days.
  • FIG. 13B is a graph of percentage of infliximab oligosaccharides with sialic acid, as determined by the WAX method, as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on sialic acid content (results are presented as an average from two duplicate bioreactors).
  • Y-axis % sialic acid;
  • X-axis bioreactor age in days.
  • FIG. 13C is a graph of viable cell density as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on viable cell density.
  • Y-axis viable cell density (millions of viable cells/mL);
  • X-axis bioreactor age in days.
  • FIG. 13D is a graph of percentage of viable cells as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on culture viability.
  • Y-axis % viable cells;
  • X-axis bioreactor age in days.
  • FIG. 13E is a graph of infliximab concentration as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on the concentration of infliximab.
  • the y-axis concentration mg/mL as indicated contains a a typographical error. The concentration is mg/L.
  • Y-axis infliximab concentration (mg/L)
  • X-axis bioreactor age in days.
  • FIG. 13F is an enlargement of Days 0-25 of the graph shown in FIG. 13E .
  • the y-axis concentration mg/mL as indicated contains a typographical error. The concentration is mg/L.
  • Y-axis infliximab concentration (mg/L)
  • X-axis bioreactor age in days.
  • FIG. 13G is a graph of percentage of G0F (WAX Component 1) as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on the percentage of infliximab oligosaccharides that lack galactose.
  • X-axis bioreactor age in days.
  • FIG. 14A is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on CTL removal.
  • X-axis bioreactor age in days.
  • FIG. 14B is a graph of percentage of infliximab oligosaccharides with sialic acid, as determined by the WAX method, as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on sialic acid content.
  • FIG. 14C is a graph of viable cell density as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on viable cell density.
  • Y-axis viable cell density (millions of viable cells/mL);
  • X-axis bioreactor age in days.
  • FIG. 14D is a graph of percentage of viable cells as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on culture viability.
  • Y-axis % viable cells;
  • X-axis bioreactor age in days.
  • FIG. 14E is a graph of infliximab concentration as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on the concentration of infliximab.
  • the y-axis concentration mg/mL as indicated contains a a typographical error. The concentration is mg/L.
  • Y-axis infliximab concentration (mg/L)
  • X-axis bioreactor age in days.
  • FIG. 14F is an enlargement of Days 0-25 of the graph shown in FIG. 14E .
  • the y-axis concentration mg/mL as indicated contains a a typographical error. The concentration is mg/L.
  • Y-axis infliximab concentration (mg/L)
  • X-axis bioreactor age in days.
  • FIG. 15 is a graph of percentage of G0F (WAX Component 1) as a function of bioreactor age, and shows the effect of varying EDTA concentration ( ⁇ M) on the percentage of infliximab oligosaccharides that lack galactose.
  • FIG. 16 shows a biosynthetic pathway for the most common neutral oligosaccharides of infliximab, G0F, G1F and G2F, and a biosynthetic pathway from neutral oligosaccharides to sialylated forms.
  • FIG. 17 is a graph of CTL removal (computed using the cIEF method from Peak 1 data) as a function of Zn +2 concentration, and shows the percentage of CTL removal at Day 20 for the DOE3 and BSA Blending No. 1 experiments (the blue data points and the line represents the average).
  • FIG. 18 is a graph of CTL removal (computed using the cIEF method from Peak 1 data) as a function of Zn +2 concentration, and shows the percentage of CTL removal at Day 13 for the DOE3 experiment.
  • FIG. 19 is a graph of sialic acid content as a function of Zn +2 concentration, and shows the percentage of sialic acid at Day 20 for the DOE3 and BSA Blending No. 1 experiments (the line represents the average).
  • FIG. 20 is a graph of percentage of WAX Component 1 (G0F) as a function of Zn +2 concentration, and shows the percentage of infliximab oligosaccharides that lack galactose at Day 20 for the DOE3 and BSA Blending No. 1 experiments.
  • FIG. 21 is a graph of estimated ratio of sialic acid to galactose (estimated as percent sialic acid/(100 ⁇ percentage of WAX Component 1) as a function of Zn +2 concentration, and shows the estimated ratio of sialic acid to galactose at Day 20 for the DOE3 and BSA Blending No. 1 experiments.
  • FIG. 22 is a graph of CTL removal (computed using the cIEF method from Peak 1 data) as a function of EDTA concentration, and shows the percent CTL removal in the presence of 1.1-1.2 ⁇ M Zn +2 at Days 33-35 for Blending No. 1 and No. 2 experiments.
  • FIG. 23 is a graph of percentage of sialic acid as a function of EDTA concentration, and shows the percent sialic acid in the presence of 1.1-1.2 ⁇ M Zn +2 at Days 33-35 for Blending No. 1 and No. 2 experiments.
  • FIG. 24 is a graph of percentage of WAX Component 1 as a function of EDTA concentration, and shows the percentage of infliximab oligosaccharides that lack galactose in the presence of 1.1-1.2 ⁇ M Zn +2 at Days 33-35 for the Blending No. 1 and No. 2 experiments.
  • FIG. 25 is a graph of estimated ratio of sialic acid to galactose (estimated as percent sialic acid/(100 ⁇ percentage of WAX Component 1) as a function of EDTA concentration, and shows the estimated ratio of sialic acid to galactose in the presence of 1.1-1.2 ⁇ M Zn +2 at Days 33-35 for the Blending No. 1 and No. 2 experiments.
  • FIG. 26 is a graph of percentage of sialic acid (calculated from WAX Component 5) as a function of percentage of G0F (calculated from WAX Component 1), and shows the inverse relationship between percentage of sialic acid and WAX Component 1, an indicator of infliximab oligosaccharides that lack galactose, for the DOE3 and BSA Blending No. 1 and No. 2 experiments.
  • FIGS. 27A and 27B provide schematic diagrams of the plasmids used for expression of the chimeric H (pA2HG1apgpt) and L (pA2HuKapgpt) chains of the chimeric A2 antibody.
  • FIG. 28 is an amino acid sequence of human TNF as SEQ ID NO:1.
  • FIGS. 29A-29B are nucleic acid sequence (SEQ ID NO:2) and corresponding amino acid sequence (SEQ ID NO:3) of a cloned cA2 light chain variable region.
  • FIG. 29B is a nucleic acid sequence (SEQ ID NO:4) and corresponding amino acid sequence (SEQ ID NO:5) of a cloned cA2 heavy chain variable region.
  • One embodiment provides a method for producing an antibody having a C-terminal lysine content of about 20% to about 70%, and a sialic acid content of about 1% to about 20%, comprising culturing a zinc-responsive host cell transfected with DNA encoding the antibody in a culture medium comprising at least 0.5 ⁇ M zinc; and controlling the concentration of zinc in the culture medium, thereby producing the antibody.
  • CTL removal is expressed herein as the percentage of heavy chains lacking a C-terminal lysine (des-Lys). So, “80% Des-Lys” is equivalent to 20% CTL content.
  • CTL content of the antibody or anti-TNF ⁇ antibody, or antigen binding fragment thereof is about 40% to about 70%, specifically, about 55% to about 65%, and more specifically, about 60%.
  • an antibody or anti-TNF ⁇ antibody, or antigen binding fragment thereof has a galactose content of about 50% to about 90% and, specifically, of about 45% to about 85%.
  • both heavy chains of an antibody are glycosylated.
  • some of the heavy chains remain aglycosylated.
  • approximately 94% of antibody molecules are glycosylated on both chains, approximately 6% of antibody molecules are hemi-glycosylated, and approximately 0.1% of antibody molecules are fully aglycosylated.
  • the ratio of sialic acid to galactose is calculated from the molar ratio of sialic acid to galactose in the oligosaccharides of infliximab.
  • the antibody or anti-TNF ⁇ antibody, or antigen binding fragment thereof has a ratio of sialic acid to galactose of about 0.05 to about 0.20.
  • Zinc-responsive host cell means a host cell that responds to fluctuations in zinc concentration in its culture medium. Responsiveness of a host cell to fluctuations in zinc concentration can be evaluated, for example, by measuring the effect of varying zinc concentrations on CTL content, sialic acid content, galactose content, and ratio of sialic acid to galactose in an antibody produced by the host cell. Methods for assessing CTL content, sialic acid content, galactose content, and ratio of sialic acid to galactose in an antibody produced by a host cell are described in the Exemplification.
  • the invention provides a culture medium comprising an amount of zinc greater than about 0.5 ⁇ M.
  • the concentration of zinc in the culture medium is in the range of about 0.6 ⁇ M to about 6.5 ⁇ M and, preferably, in the range of about 0.6 ⁇ M to about 1.1 ⁇ M.
  • the amount or concentration of zinc in the culture medium is non-toxic to the zinc-responsive host cells, for example, does not reduce or substantially reduce cell viability, cell growth or antibody production, particularly in the first 20-25 days of the culture.
  • the culture medium further comprises ethylenediaminetetraacetic acid (EDTA) (“EDTA” or “total EDTA” as referred herein) in a concentration range of about 2.5 ⁇ M to about 30 ⁇ M and, preferably, in a concentration range of about 5 ⁇ M to about 16 ⁇ M.
  • EDTA ethylenediaminetetraacetic acid
  • total EDTA total EDTA
  • the ion Fe+3 has the highest affinity for EDTA of the metal ions in the culture medium. Therefore, Fe+3, when present will preferentially bind EDTA in the cell culture medium.
  • the concentration of iron-free EDTA represents the EDTA available to bind Zn+2 and other metal ions in the culture medium.
  • the amount or concentration of EDTA and/or iron-free EDTA in the culture medium is non-toxic to the zinc-responsive host cells, for example, does not reduce or substantially reduce cell viability, cell growth or antibody production, particularly in the first 20-25 days of the culture.
  • Controlling means to verify and/or regulate. Controlling includes sensing/measuring a substance being controlled (directly or indirectly) and using those measurements to provide feedback to make corrections toward the desired result. Controlling includes both monitoring and regulating, for example, the concentration of zinc and/or EDTA and/or iron-free EDTA in a culture medium. Typically, the concentration of zinc and/or EDTA and/or iron-free EDTA is controlled for the duration of the culture. In some embodiments of the methods described herein, the concentration of zinc and/or EDTA and/or iron-free EDTA is controlled during an exponential growth phase of the zinc-responsive host cells, or during the first approximately 10-25 days of culture.
  • the concentration of zinc and/or EDTA and/or iron-free EDTA in the culture medium can be controlled by, for example, monitoring a level of zinc and/or EDTA and/or iron-free EDTA in the culture medium; and regulating the level of zinc and/or EDTA and/or iron-free EDTA in the culture medium. Therefore, in some embodiments of the methods described herein, controlling the concentration of zinc comprises monitoring the concentration of zinc in the culture medium, and regulating the concentration of zinc in the culture medium, such that the concentration of zinc in the culture medium is at least 0.5 ⁇ M, or about 0.6 ⁇ M to about 6.5 ⁇ M.
  • the concentration of zinc and other metal ions may be measured by inductively coupled plasma mass spectrometry (ICP-MS), while the concentration EDTA may be measured by an HPLC method.
  • ICP-MS inductively coupled plasma mass spectrometry
  • to “regulate,” as used herein, means to put or maintain in order. Regulating includes maintaining, for example, the concentration of zinc and/or EDTA in a culture medium, and adjusting, for example, the concentration of zinc and/or EDTA in a culture medium, as necessary.
  • zinc e.g., a non-toxic amount of zinc
  • the concentration of zinc can be maintained at a concentration of, for example, 0.6 ⁇ M to about 1.1 ⁇ M for the duration of the culture.
  • Regulation of the level of zinc and/or EDTA and/or iron-free EDTA can be achieved, for example, through direct addition of zinc, iron and/or EDTA to the culture medium; through blending of raw materials that contain zinc, iron and/or EDTA; through treatment of raw materials to adjust the zinc, iron and/or EDTA concentrations thereof; and/or through modification of the manufacturing process of the raw materials to achieve desired levels of zinc, iron and/or EDTA.
  • Methods of regulating components of a culture medium are known to those of skill in the art.
  • the culture medium can comprise other ingredients in addition to zinc and/or EDTA.
  • the choice of a suitable culture medium is within the knowledge of one skilled in the art.
  • the culture medium is a serum-free medium.
  • Any host cells known in the art for use to produce antibodies can be used, including mammalian cells, such as SP2/0 cells, e.g., mouse SP2/0 cell (American Type Culture Collection (ATCC), Manassas, Va., CRL-1581), Other exemplary host cells are NS0 (European Collection of Cell Cultures (ECACC), Salisbury, Wiltshire, UK, ECACC No. 85110503), FO (ATCC CRL-1646) and Ag653 (ATCC CRL-1580) murine cell lines.
  • An exemplary human myeloma cell line is U266 (ATTC CRL-TIB-196).
  • CHO Chinese Hamster Ovary
  • CHO-K1SV Longza Biologics, Walkersville, Md.
  • ATCC CRL-611 CHO-K1
  • DG44 CHO-K1
  • Cells can be cultured in single-cell suspension or in an anchorage-dependent fashion.
  • Culture medium can be added in a batch process, in which culture medium is added once to the cells in a single batch or, preferably, in a fed batch process, in which small batches of culture medium are periodically added.
  • the host cells can also be cultured in a perfusion culture, which involves continuously removing a volume of culture medium from the culture, and replacing the removed volume with a comparable volume of fresh medium.
  • perfused cultures can be operated to achieve higher cell densities than batch cultures, and can be maintained for longer periods of time. Perfused cultures also enable repeated harvests.
  • Methods for producing an antibody can further comprise recovering the antibody.
  • the antibody can be recovered when the zinc-responsive host cells in the culture medium reach a cell density of about 1.5 million cells per mL to about 11 million cells per mL and, preferably, about 3 million cells per mL to about 11 million cells per mL.
  • An antibody can be recovered, for example, by direct product capture (DPC).
  • DPC direct product capture
  • the concentration of zinc is controlled until the antibody is recovered.
  • the antibody is recovered concurrently with or just after the transition from the exponential growth phase to the steady-state phase. In other embodiments, the antibody is recovered during the steady-state phase of culture growth. In some embodiments, the antibody is recovered within the first 25 days of culture, for example, at Days 10-25, Days 15-20, or around Day 20. In other embodiments, the antibody is recovered after the first 25 days of culture.
  • Also provided herein is a method for controlling C-terminal lysine content of an antibody having a C-terminal lysine content of about 20% to about 70%, in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • Also provided herein is a method for controlling sialic acid content of an antibody having a sialic acid content of about 1% to about 20% in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • Also provided herein is a method for controlling galactose content of an antibody having a galactose content of about 50% to about 90% in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • Also provided herein is a method for controlling the ratio of sialic acid to galactose in an antibody having a ratio of sialic acid to galactose of about 0.05 to about 0.20 in a process for biosynthesizing the antibody in a culture medium, the method comprising monitoring a level of zinc in the culture medium during biosynthesis of the antibody; and regulating the level of zinc in the culture medium during biosynthesis of the antibody.
  • the antibody is an anti-TNF ⁇ antibody or antigen-binding fragment thereof, and/or the antibody is biosynthesized by an SP2/0 cell or a CHO cell.
  • an “antibody” includes a whole antibody and any antigen binding fragment or a single chain thereof.
  • Antibodies can include at least one of a heavy chain constant region (H c ), a heavy chain variable region (H v ), a light chain variable region (L v ) and a light chain constant region (L c ), wherein a polyclonal Ab, monoclonal Ab, fragment and/or regions thereof include at least one heavy chain variable region (H v ) or light chain variable region (L v ) which binds a portion of an antigen and inhibits and/or neutralizes at least one biological activity of the antigen.
  • H c heavy chain constant region
  • H v heavy chain variable region
  • L v light chain variable region
  • L c light chain constant region
  • An antibody or antigen-binding fragment can comprise an antigen-binding region that comprises at least one human complementarity determining region (CDR1, CDR2 and CDR3) or variant of at least one heavy chain variable region and at least one human complementarity determining region (CDR1, CDR2 and CDR3) or variant of at least one light chain variable region.
  • Such antibodies can be prepared by chemically joining together the various portions (e.g., CDRs, framework) of the antibody using conventional techniques, by preparing and expressing a (i.e., one or more) nucleic acid molecule that encodes the antibody using conventional techniques of recombinant DNA technology or by using any other suitable method.
  • An antibody can be primate, mammalian, murine, chimeric, humanized, or human.
  • An antibody can include, for example, at least one of murine-human chimeric antibodies, murine antibodies, human antibodies or any portions thereof, having at least one antigen binding fragment or region of an immunoglobulin variable region.
  • Chimeric antibodies are molecules different portions of which are derived from different animal species, such as those having variable region derived from a murine mAb and a human immunoglobulin constant region. For example, they can retain at least one distinct domains, usually the variable domain, from one species and the remainder from another species; e.g., mouse-human chimeric antibodies. They are primarily used to reduce immunogenicity in application and to increase yields in production, for example, where murine mAbs have higher yields from hybridomas but higher immunogenicity in humans, such that human/murine chimeric mAbs are used. Chimeric antibodies and methods for their production are known in the art (Cabilly et al., Proc. Natl. Acad. Sci.
  • chimeric antibody includes monovalent, divalent or polyvalent immunoglobulins.
  • a monovalent chimeric antibody is a dimer (HL) formed by a chimeric H chain associated through disulfide bridges with a chimeric L chain.
  • a divalent chimeric antibody is a tetramer (H 2 L 2 ) formed by two HL dimers associated through at least one disulfide bridge.
  • a polyvalent chimeric antibody can also be produced, for example, by employing a C H region that aggregates (e.g., from an IgM H chain, or ⁇ chain).
  • Humanized antibodies are produced by a process to reduce the immunogenicity of monoclonal antibodies (mAbs) from xenogeneic sources (commonly rodent) and for improving the effector functions (e.g., ADCC, complement activation, and/or C1q binding).
  • mAbs monoclonal antibodies
  • xenogeneic sources commonly rodent
  • effector functions e.g., ADCC, complement activation, and/or C1q binding
  • a humanized antibody has one or more amino acid residues from a source which is non-human, for example, but not limited to, mouse, rat, rabbit, non-human primate or other mammal.
  • the engineered mAb can be engineered using molecular biology techniques.
  • Simple CDR-grafting of rodent complementarity-determining regions (CDRs) into human frameworks often results in loss of binding affinity and/or specificity of the original mAb.
  • the design of the humanized antibody can include variations such as conservative amino acid substitutions in residues of the CDRs, and back substitution of residues from the rodent mAb into the human framework regions (back mutations).
  • back mutations Methods for engineering or humanizing non-human or human antibodies are well known in the art.
  • human antibody includes antibodies having variable and constant regions derived from or closely matching human germline immunoglobulin sequences.
  • the human antibodies of the invention may include amino acid residues not encoded by human germline immunoglobulin sequences (e.g., mutations introduced by random or site-specific mutagenesis in vitro or by somatic mutation in vivo).
  • human antibody refers to an antibody in which substantially every part of the protein (e.g., CDR, framework, CL, CH domains (e.g., CH1, CH2, CH3), hinge, (VL, VH)) is substantially similar to a human germline antibody.
  • human antibody also refers to an antibody in which substantially every part of the protein (e.g., CDR, framework, C L , C H domains (e.g., C H 1, C H 2, C H 3), hinge, (V L , V H )) is substantially non-immunogenic in humans, with only minor sequence changes or variations.
  • antibodies designated primate monkey, baboon, chimpanzee, etc.
  • rodent mouse, rat, rabbit, guinea pig, hamster, and the like
  • other mammals designate such species, sub-genus, genus, sub-family, and family specific antibodies.
  • a human antibody can be produced by a non-human animal or prokaryotic or eukaryotic cell that is capable of expressing functionally rearranged human immunoglobulin (e.g., heavy chain and/or light chain) genes.
  • a human antibody when a human antibody is a single chain antibody, it can comprise a linker peptide that is not found in native human antibodies.
  • an Fv can comprise a linker peptide, such as two to about eight glycine or other amino acid residues, which connects the variable region of the heavy chain and the variable region of the light chain. Such linker peptides are considered to be of human origin.
  • Antibodies may be of any immunoglobulin class, including IgG, IgM, IgE, IgA, GILD and any subclass thereof.
  • isotype refers to the antibody class (e.g., IgM or IgG1) that is encoded by heavy chain constant region genes. In humans, there are five heavy chain isotypes and two light chain isotypes. For heavy chain, IgA1 and 2; IgD; IgG1, 2, 3, and 4; IgE; and IgM are isotypes of heavy chains. Kappa and lambda are isotypes of light chains.
  • the heavy chain is an IgG class heavy chain.
  • the heavy chain is an IgM class heavy chain.
  • the heavy chain further comprises at least about 8 amino acids of a J region.
  • Antibodies can be polyclonal antibodies, monoclonal antibodies (mAbs), anti-idiotypic (anti-Id) antibodies to antibodies that can be labeled in soluble or bound form, and fragments, regions or derivatives thereof, provided by any known technique, such as, but not limited to, enzymatic cleavage, peptide synthesis or recombinant techniques.
  • Such antibodies can be capable of binding portions of an antigen (e.g., TNF) that inhibit the binding of antigen to antigen receptors.
  • an antigen e.g., TNF
  • Polyclonal antibodies are heterogeneous populations of antibody molecules derived from the sera of animals immunized with an antigen.
  • a monoclonal antibody contains a substantially homogeneous population of antibodies specific to an antigen, A monoclonal antibody composition displays a single binding specificity for a particular epitope.
  • MAbs may be obtained by methods known to those skilled in the art. See, for example, Kohler and Milstein, Nature 256:495-497 (1975); U.S. Pat. No. 4,376,110; Ausubel et al., eds., Current Protocols in Molecular Biology , Greene Publishing Assoc. and Wiley Interscience, N.Y., (1987, 1992); and Harlow and Lane ANTIBODIES: A Laboratory Manual Cold Spring Harbor Laboratory (1988); Colligan et al., eds., Current Protocols in Immunology , Greene Publishing Assoc. and Wiley Interscience, N.Y., (1992, 1993), the contents of which references are incorporated entirely herein by reference.
  • an anti-idiotypic (anti-Id) antibody is an antibody which recognizes unique determinants generally associated with the antigen-binding site of an antibody.
  • the anti-Id antibody may also be used as an “immunogen” to induce an immune response in yet another animal, producing a so-called anti-anti-Id antibody.
  • the anti-anti-Id may be epitopically identical to the original mAb which induced the anti-Id.
  • Antibody fragments include, for example, Fab, Fab′, F(ab′) 2 and Fv. These fragments lack the Fc fragment of an intact antibody, clear more rapidly from the circulation, and can have less non-specific tissue binding than an intact antibody (Wahl et al., J. Nucl. Med. 24:316-325 (1983)). These fragments are produced from intact antibodies using methods well known in the art, for example by proteolytic cleavage with enzymes such as papain (to produce Fab fragments) or pepsin (to produce F(ab′) 2 fragments).
  • the term “antigen binding fragment” refers to that portion of an antibody molecule which contains the amino acid residues that interact with an antigen and confer on the antibody its specificity and affinity for the antigen.
  • An “antigen” is a molecule or a portion of a molecule capable of being bound by an antibody which is additionally capable of inducing an animal to produce antibody capable of binding to an epitope of that antigen.
  • An antigen can have one or more than one epitope.
  • the antibody region includes the “framework” amino acid residues necessary to maintain the proper conformation of the antigen-binding residues.
  • an “antigen binding fragment” or portion thereof includes, e.g., single chain antibodies and fragments thereof.
  • antigen binding fragments include (i) a Fab fragment, a monovalent fragment consisting of the VL, VH, CL and CH, domains; (ii) a F(ab′) 2 fragment, a bivalent fragment comprising two Fab fragments linked by a disulfide bridge at the hinge region; (iii) a Fd fragment consisting of the VH and CH, domains; (iv) a Fv fragment consisting of the VL and VH domains of a single arm of an antibody, (v) a dAb fragment in which the VH and VL domains are expressed on a single polypeptide chain; and (vi) one or more isolated complementarity determining regions (CDRs).
  • CDRs complementarity determining regions
  • fragments can be produced by enzymatic cleavage, synthetic or recombinant techniques, as known in the art and/or as described herein.
  • fragments can include one or more portions of the antibody chain, such as the heavy chain constant, joining, diversity or variable regions, or the light chain constant, joining or variable regions.
  • the antigen binding region can be of non-human, e.g., murine origin.
  • the antigen binding region can be derived from a rabbit or a rodent, such as a rat or hamster.
  • a antigen binding fragment of a chimeric antibody can be derived from a non-human antibody specific for a human antigen.
  • sources for the DNA encoding such a chimeric antibody include cell lines which produce antibody, preferably hybrid cell lines commonly known as hybridomas.
  • the hybridoma is the A2 hybridoma cell line.
  • epitope means a protein determinant capable of specific binding to an antibody.
  • Epitopes usually consist of chemically active surface groupings of molecules such as amino acids or sugar side chains and usually have specific three-dimensional structural characteristics, as well as specific charge characteristics.
  • An “epitope” can be that portion of any molecule capable of being recognized by and bound by an antibody at one or more of the Ab's antigen binding regions.
  • inhibiting and/or neutralizing epitope is intended an epitope, which, when bound by an antibody, results in loss of biological activity of the molecule or organism containing the epitope, in vivo, in vitro or in situ, more preferably in vivo, for example, binding of TNF to a TNF receptor.
  • the antibodies can be, for example, isolated, recombinant and/or synthetic antibodies.
  • a “recombinant antibody”, as used herein, includes all antibodies that are prepared, expressed, created or isolated by recombinant means.
  • the term “recombinant host cell” refers to a cell into which a recombinant expression vector has been introduced.
  • Recombinant host cells include, for example, CHO cell lines or a mouse myeloma SP2/0 derived cell line.
  • Recombinant antibodies, such as murine or chimeric murine-human or human-human antibodies can be produced using known techniques. See, e.g., Ausubel et al., eds. Current Protocols in Molecular Biology , Wiley Interscience, N.Y. (1987, 1992, 1993); and Sambrook et al. Molecular Cloning: A Laboratory Manual , Cold Spring Harbor Laboratory Press (1989), the entire contents of which are incorporated herein by reference.
  • Antibodies, fragments or derivatives having chimeric H chains and L chains of the same or different variable region binding specificity can be prepared, for example, by appropriate association of the individual polypeptide chains, according to known method steps, e.g., according to Ausubel supra, Harlow infra, and Colligan infra, the contents of which references are incorporated entirely herein by reference.
  • hosts expressing chimeric H chains (or their derivatives) are separately cultured from hosts expressing chimeric L chains (or their derivatives), and the immunoglobulin chains are separately recovered and then associated.
  • the hosts can be co-cultured and the chains allowed to associate spontaneously in the culture medium, followed by recovery of the assembled immunoglobulin, fragment or derivative.
  • the hybrid cells are formed by the fusion of a non-human anti-hTNF ⁇ antibody-producing cell, typically a spleen cell of an animal immunized against either natural or recombinant human TNF, or a peptide fragment of the human TNF ⁇ protein sequence.
  • a non-human anti-TNF ⁇ antibody-producing cell typically a spleen cell of an animal immunized against either natural or recombinant human TNF, or a peptide fragment of the human TNF ⁇ protein sequence.
  • the non-human anti-TNF ⁇ antibody-producing cell can be a B lymphocyte obtained from the blood, spleen, lymph nodes or other tissue of an animal immunized with TNF.
  • the second fusion partner which provides the immortalizing function, can be a lymphoblastoid cell or a plasmacytoma or myeloma cell, which is not itself an antibody producing cell, but is malignant.
  • the fusion partner cells include the hybridoma SP2/0-Ag14, abbreviated as SP2/0 (ATCC CRL1581) and the myeloma P3X63Ag8 (ATCC TIB9), or its derivatives. See, e.g, Ausubel infra, Harlow infra, and Colligan infra, the contents of which references are incorporated entirely herein by reference.
  • an “isolated antibody,” as used herein, is intended to refer to an antibody which is substantially free of other antibodies having different antigenic specificities.
  • An isolated antibody that specifically binds to an epitope of a human antigen may, however, have cross-reactivity to other related antigens.
  • an isolated antibody may be substantially free of other cellular materials and/or chemicals.
  • the antibody can be a biologically active antibody.
  • Biologically active antibodies have a specific activity at least 20%, 30%, or 40%, and preferably at least 50%, 60%, or 70%, and most preferably at least 80%, 90%, or 95%-100% of that of the native (non-synthetic), endogenous or related and known antibody. Methods of assaying and quantifying measures of enzymatic activity and substrate specificity, are well known to those of skill in the art.
  • the antibodies produced by the methods described herein are anti-tumor necrosis factor- ⁇ (TNF ⁇ ) antibodies.
  • tumor necrosis factor- ⁇ (TNF ⁇ ) and tumor necrosis factor (TNF) are used interchangeably to refer to tumor necrosis factor- ⁇ (TNF ⁇ ), unless otherwise specifically noted.
  • tumor necrosis factor- ⁇ (TNF ⁇ ) and tumor necrosis factor (TNF) antibodies and anti-tumor necrosis factor- ⁇ (TNF ⁇ ) and anti-tumor necrosis factor (TNF) antibodies are used interchangeably, unless otherwise specifically noted.
  • TNF ⁇ is a soluble homotrimer of 17 kD protein subunits (Smith, et al., J. Biol. Chem. 262:6951-6954 (1987)). A membrane-bound 26 kD precursor form of TNF also exists (Kriegler et al., Cell 53:45-53 (1988)). For reviews of TNF, see Beutler, et al., Nature 320:584 (1986), Old, Science 230:630 (1986), and Le, et al., Lab. Invest. 56:234. The complete primary sequence of human TNF ⁇ , according to Pennica et al., Nature 312:724-729 (1984) is shown in FIG. 28 (SEQ ID NO:1).
  • TNF ⁇ can cause pro-inflammatory actions which result in tissue injury.
  • Tumor necrosis factor (TNF ⁇ ) mediates or is involved in many pathologies, such as, but not limited to, bacterial, viral or parasitic infections, chronic inflammatory diseases, autoimmune diseases, malignancies, and/or neurodegenerative diseases. Accordingly, in some embodiments, the antibodies have neutralizing and/or inhibiting activity against TNF.
  • the antibodies are high affinity human-murine chimeric anti-TNF antibodies, and fragments or regions thereof, that have potent inhibiting and/or neutralizing activity in vivo against human TNF ⁇ .
  • Such antibodies and chimeric antibodies can include those generated by immunization using purified recombinant hTNF ⁇ (SEQ ID NO:1) or peptide fragments thereof.
  • the antibodies and fragments bind specifically to TNF ⁇ . In some embodiments, they can also decrease, block, abrogate, interfere, prevent and/or inhibit TNF RNA, DNA or protein synthesis, TNF release, TNF receptor signaling, membrane TNF cleavage, TNF activity, TNF production and/or synthesis in vitro, in situ and/or in vivo.
  • the antibody is cA2.
  • Chimeric antibody cA2 consists of the antigen binding variable region of the high-affinity neutralizing mouse anti-human TNF ⁇ IgG1 antibody, designated A2, and the constant regions of a human IgG1, kappa immunoglobulin.
  • the human IgG1 Fc region improves allogeneic antibody effector function, increases the circulating serum half-life and decreases the immunogenicity of the antibody.
  • the avidity and epitope specificity of the chimeric antibody cA2 is derived from the variable region of the murine antibody A2.
  • a source for nucleic acids encoding the variable region of the murine antibody A2 is the A2 hybridoma cell line.
  • murine monoclonal antibody A2 is produced by a cell line designated c134A.
  • chimeric antibody cA2 is produced by a cell line designated c168A.
  • the antibody or antigen-binding fragment can comprise at least one of the heavy chain CDR3 of cA2 and/or a light chain CDR3 of cA2.
  • the antibody or antigen-binding fragment can have an antigen-binding region that comprises at least a portion of at least one heavy chain CDR (i.e., CDR1, CDR2 and/or CDR3) having the amino acid sequence of the corresponding CDRs 1, 2 and/or 3 of cA2.
  • the antibody or antigen-binding portion or variant can have an antigen-binding region that comprises at least a portion of at least one light chain CDR (i.e., CDR1, CDR2 and/or CDR3) having the amino acid sequence of the corresponding CDRs 1, 2 and/or 3 of cA2.
  • the three heavy chain CDRs and the three light chain CDRs of the antibody or antigen-binding fragment have the amino acid sequence of the corresponding CDRs of at least one of mAb A2 or cA2, as described herein.
  • the avidity and epitope specificity of the chimeric A2 is derived from the variable region of the murine A2.
  • cross-competition for TNF has been observed between chimeric and murine A2, indicating an identical epitope specificity of cA2 and murine A2.
  • the specificity of cA2 for TNF- ⁇ was confirmed by its inability to neutralize the cytotoxic effects of lymphotoxin (TNF- ⁇ ).
  • Chimeric A2 neutralizes the cytotoxic effect of both natural and recombinant human TNF in a dose dependent manner. From binding assays of cA2 and recombinant human TNF, the affinity constant of cA2 was calculated to be 1.8 ⁇ 10 9 M 1 .
  • TNF neutralizing activity of a TNF neutralizing compound can include in vitro or in vivo assays.
  • Such in vitro assays can include a TNF cytotoxicity assay, such as a radioimmuno assay, which determines a decrease in cell death by contact with TNF, such as chimpanzee or human TNF in isolated or recombinant form, wherein the concurrent presence of a TNF neutralizing compound reduces the degree or rate of cell death.
  • the cell death can be determined using ID50 values which represent the concentration of a TNF neutralizing compound which decreases the cell death rate by 50%.
  • ID50 values which represent the concentration of a TNF neutralizing compound which decreases the cell death rate by 50%.
  • mAb's A2 and cA2 are found to have ID50 about 17 mg/ml+/ ⁇ 3 mg/ml, such as 14-20 mg/ml, or any range or value therein.
  • the antibodies can competitively inhibit in vivo the binding to human TNF ⁇ of anti-TNF ⁇ murine mAb A2, chimeric mAb cA2, or an antibody having substantially the same specific binding characteristics, e.g., epitopic specificity, as A2 and/or cA2.
  • Epitopes recognized by antibodies, and fragments and regions thereof can include 5 or more amino acids comprising at least one amino acid of each or both of the following amino acid sequences of TNF, which provide a topographical or three dimensional epitope of TNF which is recognized by, and/or binds with anti-TNF activity, a TNF antibody, or fragments thereof:
  • AA 59-80 of SEQ ID NO: 1 59-80: Tyr-Ser-Gln-Val-Leu-Phe-Lys-Gly-Gln-Gly- Cys-Pro-Ser-Thr-His-Val-Leu-Leu-Thr-His- Thr-Ile; and (AA 87-108 of SEQ ID NO: 1) 87-108: Tyr-Gln-Thr-Lys-Val-Asn-Leu-Leu-Ser-Ala- Ile-Lys-Ser-Pro-Cys-Gln-Arg-Glu-Thr-Pro- Glu-Gly.
  • antibodies, fragments and regions of anti-TNF antibodies recognize epitopes including 5 amino acids comprising at least one amino acid from amino acids residues 87-108 or both residues 59-80 and 87-108 of hTNF ⁇ (of SEQ ID NO:1). In some embodiments, the antibodies, fragments and regions of anti-TNF antibodies do not recognize epitopes from at least one of amino acids 11-13, 37-42, 49-57 or 155-157 of hTNF ⁇ (of SEQ ID NO:1). (The putative receptor binding locus as presented by Eck and Sprang ( J. Biol. Chem. 264(29): 17595-17605 (1989)).
  • the antibody is an anti-hTNF chimeric antibody comprising two light chains and two heavy chains, each of the chains comprising at least part of a human constant region and at least part of a variable (V) region of non-human origin having specificity to human TNF, said antibody binding with high affinity to a inhibiting and/or neutralizing epitope of human TNF.
  • V variable
  • the antibody is for use in diagnostic methods for detecting TNF in patients or animals suspected of suffering from conditions associated with abnormal TNF production.
  • the TNF antibodies are used for alleviating symptoms or pathologies involving TNF, such as, by not limited to bacterial, viral or parasitic infections, chronic inflammatory diseases, autoimmune diseases, malignancies, and/or neurodegenerative diseases.
  • Murine hybridomas which produce mAb specific for human TNF ⁇ or TNF ⁇ are formed by the fusion of a mouse fusion partner cell, such as SP2/0, and spleen cells from mice immunized against purified hTNF ⁇ , recombinant hTNF ⁇ , natural or synthetic TNF peptides, including peptides including 5 or more amino acids selected from residues 59-80, and 87-108 of TNF (of SEQ ID NO:1) or other biological preparations containing TNF.
  • a variety of different conventional protocols can be followed. For example, mice can receive primary and boosting immunizations of TNF.
  • the antibodies described herein can bind human TNF with a wide range of affinities (K D ).
  • at least one human mAb can optionally bind human TNF with high affinity.
  • a human mAb can bind human TNF with a K D equal to or less than about 10 ⁇ 7 M, such as but not limited to, 0.1-9.9 (or any range or value therein) ⁇ 10 ⁇ 7 , 10 ⁇ 8 , 10 ⁇ 9 , 10 ⁇ 10 , 10 ⁇ 11 , 10 ⁇ 12 , 10 ⁇ 13 or any range or value therein.
  • the affinity or avidity of an antibody for an antigen can be determined experimentally using any suitable method.
  • any suitable method See, for example, Berzofsky, et al., “Antibody-Antigen Interactions,” In Fundamental Immunology , Paul, W. E., Ed., Raven Press New York, N.Y. (1984); Kuby, Janis Immunology , W. H. Freeman and Company: New York, N.Y. (1992); and methods described herein).
  • the measured affinity of a particular antibody-antigen interaction can vary if measured under different conditions (e.g., salt concentration, pH).
  • affinity and other antigen-binding parameters e.g., K D , K a , K d
  • K D , K a , K d are preferably made with standardized solutions of antibody and antigen, and a standardized buffer, such as the buffer described herein.
  • the anti-TNF antibody can comprise at least one of a heavy or light chain variable region having a defined amino acid sequence.
  • the anti-TNF antibody comprises at least one of at least one light chain variable region, optionally having the amino acid sequence of SEQ ID NO:3 and/or at least one heavy chain variable region, optionally having the amino acid sequence of SEQ ID NO:5.
  • Antibodies that bind to human TNF and that comprise a defined heavy or light chain variable region can be prepared using suitable methods, such as phage display (Katsube, Y., et al., Int J Mol. Med, 1(5):863-868 (1998)) or methods that employ transgenic animals, as known in the art and/or as described herein.
  • the anti-TNF antibody comprises the light chain CDRs CDR1, CDR2 and CDR3 sequences corresponding to amino acid residues 24-34, 50-56 and 89-97 of SEQ ID NO: 3, respectively, and the heavy chain CDRs HCDR1, HCDR2 and HCDR3 corresponding to amino acid residues 31-35, 50-68 and 101-109 of SEQ ID NO: 5, respectively, delineated according to Kabat.
  • An anti-TNF antibody can further optionally comprise a polypeptide of at least one of 70-100% of the contiguous amino acids of at least one of SEQ ID NOS:3 and 5.
  • the amino acid sequence of an immunoglobulin chain, or portion thereof has about 70-100% identity (e.g., 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 or any range or value therein) to the corresponding chain of at least one of SEQ ID NOS:3 and 5.
  • amino acid sequence of a light chain variable region can be compared with the sequence of SEQ ID NO:8, or the amino acid sequence of a heavy chain CDR3 can be compared with SEQ ID NO:7.
  • 70-100% amino acid identity i.e., 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 or any range or value therein is determined using a suitable computer algorithm, as known in the art.
  • the antibodies can comprise any number of contiguous amino acid residues from an antibody, wherein that number is selected from the group of integers consisting of from 10-100% of the number of contiguous residues in an anti-TNF antibody.
  • this subsequence of contiguous amino acids is at least about 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250 or more amino acids in length, or any range or value therein.
  • the number of such subsequences can be any integer selected from the group consisting of from 1 to 20, such as at least 2, 3, 4, or 5.
  • Antibodies also include high affinity and/or potent in vivo TNF-inhibiting and/or neutralizing antibodies, fragments or regions thereof, for both TNF immunoassays and therapy of TNF-mediated pathology.
  • Such antibodies, fragments, or regions will preferably have an affinity for hTNF ⁇ , expressed as Ka, of at least 10 8 M ⁇ 1 , more preferably, at least 10 9 M ⁇ 1 , such as 10 8 -10 10 M ⁇ 1 , 5 ⁇ 10 8 M ⁇ 1 , 8 ⁇ 10 8 M ⁇ 1 , 2 ⁇ 10 9 M ⁇ 1 , 4 ⁇ 10 9 M ⁇ 1 , 6 ⁇ 10 9 M ⁇ 1 , 8 ⁇ 10 9 M ⁇ 1 , or any range or value therein.
  • TNF antibodies also include high affinity murine and chimeric antibodies, and fragments, regions and derivatives having potent in vivo TNF ⁇ -inhibiting and/or neutralizing activity that block TNF-induced IL-6 secretion.
  • antibodies for human therapeutic uses include high affinity murine and chimeric anti-TNF ⁇ antibodies, and fragments, regions and derivatives thereof, that block TNF-induced procoagulant activity, including blocking of TNF-induced expression of cell adhesion molecules such as ELAM-I and ICAM-I and blocking of TNF mitogenic activity, in vivo, in situ, and in vitro.
  • CTL removal can be controlled to less than the maximum level by control of extracellular Zn+2.
  • CTL content can be controlled within a range (e.g., 40 to 70%) by controlling the extracellular concentration of Zn+2 to a value of ⁇ 1.2 ⁇ M.
  • control to a higher range of CTL content is possible with higher Zn+2 concentrations up to 6.3 ⁇ M.
  • CTL content can be further controlled by controlling the extracellular [EDTA] or [EDTA-Fe+3].
  • sialic acid content can be controlled to less than the maximum level by control of extracellular Zn+2.
  • sialic acid can be controlled within a range (e.g., 4 to 13%) by controlling the extracellular concentration of Zn+2 to a value of ⁇ 1.2 ⁇ M.
  • control to a higher range of sialic acid content is possible with higher Zn+2 concentrations up to 6.3 ⁇ M.
  • sialic acid content can be further controlled by controlling the extracellular [EDTA] or [EDTA-Fe+3].
  • antibody production can also be controlled by controlling the extracellular concentration of Zn+2.
  • control of Zn+2, Fe+3 and EDTA concentrations to achieve control of sialic acid addition, CTL removal and antibody production can be achieved through a variety of means, including any of the following, alone or in combination: 1) Direct addition of Zn+2, Fe+3 and EDTA to the culture medium, 2) through blending of raw materials that have Zn+2, Fe+3 or EDTA as components, 3) through treatment of raw materials to adjust the Zn+2, Fe+3 or EDTA concentrations, and/or 4) through modification of the manufacturing processes of the complex raw materials to achieve desired levels of Zn+2, Fe+3, and/or EDTA.
  • infliximab was purified by direct product capture (DPC) using a Protein A column. It was then characterized by capillary isoelectric focusing (cIEF) or the WAX assay. Infliximab that has been purified by DPC using a Protein A column is referred to herein as a “DPC sample” or “DPC eluate.”
  • cIEF was used to calculate the CTL content of infliximab oligosaccharides.
  • PFB pre-formulated bulk
  • the light chain CTL is not subject to removal. CTL removal tends to be lower for early bioreactor samples and increases for middle and late bioreactor samples.
  • Typical infliximab eluates from early and late bioreactor samples exhibit sialic acid contents of approximately 3% to 14% of the IgG oligosaccharides. Sialic acid addition is typically lower for early bioreactor samples and higher for middle and late bioreactor samples. Reversed-phase peptide mapping revealed consistent, low levels of deamidation at several deamidation sites for infiximab on the heavy chain and the light chain.
  • Peak 1 corresponds to infliximab containing no excess charges; that is, this peak or band contains both C-terminal lysines, no sialic acid, and no deamidation.
  • the second, third, fourth, fifth and sixth peaks or bands contain 1, 2, 3, 4 and 5 excess charges, respectively, due to a combination of CTL removal, sialic acid addition and deamidation.
  • FIG. 1 is a cIEF electropherogram of a sample of infliximab, and shows the pI values for Peaks 1-6.
  • FIG. 2 is a fitted line plot of percentage of des-lysine (des-Lys) as a function of percentage of Peak 1, and shows the correlation between CTL content (expressed as percentage of des-Lys) and the percentage of Peak 1 across a range of experimental conditions.
  • the correlation depicted in FIG. 2 was created from infliximab samples for which percentage of des-Lys was determined by peptide mapping and percentage of Peak 1 was determined by cIEF.
  • CTL removal is expressed herein as the percentage of heavy chains lacking a C-terminal lysine (des-Lys). So, “80% Des-Lys” is equivalent to 20% CTL content.
  • the correlation between percentage of des-Lysine and percentage of Peak 1 (as measured by cIEF) holds for infliximab samples that exhibit typical percentages of CTL removal, sialic acid addition, and deamidation.
  • CTL removal in these experiments ranged from the typical values of 30-60%, to higher values. Under these conditions, CTL removal would continue to be the dominant determinant of percentage of Peak 1.
  • the WAX assay was used to determine the sialic acid content and the galactose content of infliximab oligosaccharides.
  • N-linked oligosaccharides are released from the IgG using PNGase F, then are derivatized using a solution of anthranilic acid and sodium cyanoborohydride.
  • Samples are purified using 0.45-micron nylon ACRODISC® filters, and analyzed on an Agilent 1100 HPLC with a fluorescence detector. Peak identities are resolved using commercially available N-glycan standards.
  • Component 5A is the percentage of infliximab oligosaccharides containing sialic acid.
  • Component 1 is highly correlated with the percentage of infliximab oligosaccharides that lack galactose. Therefore, (100 ⁇ percentage of Component 1) represents a reasonable estimate of the percentage of infliximab oligosaccharides that contain galactose.
  • one asparagine (Asn) residue is glycosylated with an oligosaccharide, which can contain, for example, one or two galactose residues and one or two sialic acid residues.
  • both heavy chains of infliximab are glycosylated. However, in some circumstances, some of the heavy chains remain aglycosylated. For example, in some embodiments, approximately 94% of infliximab molecules are glycosylated on both chains, approximately 6% of infliximab molecules are hemi-glycosylated, and approximately 0.1% of infliximab molecules are fully aglycosylated.
  • the ratio of sialic acid to galactose is calculated from the molar ratio of sialic acid to galactose in the oligosaccharides of infliximab.
  • Sialic acid is known to be added to glycoproteins intracellularly, prior to secretion.
  • extracellular removal of sialic acid from secreted recombinant glycoproteins has been reported for chinese hamster ovary (CHO) cell cultures.
  • CHO cells the sialidase is released into the extracellular medium from lysed cells. So, a second purpose of these harvest hold studies was to clarify whether there is extracellular removal of sialic acid in the cell-free harvest for the infliximab process.
  • a harvest hold study using harvest from manufacturing scale bioreactors demonstrated that holding harvest under varying conditions (clarified, cell-free harvest held for 30 days at 2 to 14° C.; unclarified harvest held for 14 days at 2-8° C.) and varying bioreactor ages had no impact on the cIEF gel profile of infliximab.
  • SFM-10.1 corresponds to infliximab SFM-10 medium lacking BSA and CM2 (Part B) liquid (including zinc-containing insulin).
  • the purpose of the SFM-10.1 Experiment was to probe the impact of Zn +2 supplementation on the production of infliximab.
  • the four experimental conditions represent SFM-10.1 medium supplemented with zinc sulfate heptahydrate, which was added in an amount sufficient to add 0.25, 0.5, 1.0 or 2.0 ⁇ M Zn +2 to the final medium concentration.
  • the total Zn +2 concentration in each experiment was the sum of this supplementation plus the Zn +2 contributed from PRIMATONE® (available from Kerry Ingredients and Flavours, Beloit, Wis.), which was determined to be 0.49 ⁇ M (based on metals analysis).
  • PRIMATONE® available from Kerry Ingredients and Flavours, Beloit, Wis.
  • the Fe +3 concentration in these bioreactors was 5.8 ⁇ M, based on metals analysis of the PRIMATONE® lot employed.
  • the EDTA concentration is estimated to be 2 ⁇ M, contributed from transferrin. EDTA has a much stronger affinity for Fe+3 than for Zn+2 and other divalent cations. Therefore, the computation of [EDTA-Fe+3] may represent the concentration of EDTA that is available to chelate Zn+2. Therefore, in this first set of experiments, it can be expected that there is no free EDTA available to bind extracellular Zn 2+ .
  • FIG. 3 is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from the Peak 1 data) as a function of bioreactor age, and shows the effect of varying Zn +2 concentrations on CTL removal.
  • the bioreactors with total Zn+2 concentrations of approximately 1.5 and 2.5 ⁇ M exhibited 70% to 80% CTL removal at all time points. There is no change in charge distribution as a function of bioreactor age, as all time points (early, middle and late bioreactor samples) have high CTL removal.
  • the bioreactor with a Zn+2 concentration of 1.0 ⁇ M exhibited 60% CTL removal early in the study and approximately 70% removal at the middle and late sample points.
  • the bioreactor with a Zn+2 concentration of approximately 0.74 ⁇ M exhibited increasing CTL removal as a function of bioreactor age.
  • FIG. 4 is a graph of percentage of infliximab oligosaccharides with sialic acid, as determined by the WAX method, as a function of bioreactor age, and shows the effect of varying Zn +2 concentrations on the percentage of sialic acid.
  • FIG. 4 shows there was no clear trend in sialic acid addition as a function of Zn+2 concentration in this experiment.
  • FIGS. 5-7 are graphs of the viable cell density, culture viability and infliximab concentration, respectively, as a function of time, and show the effect of varying concentrations of Zn+2 in the SFM-10.1 experiment.
  • the results in the period prior to reaching target cell density at approximately Day 15-20 are the most revealing, as this represents a period in which every bioreactor is operated consistently.
  • After reaching target cell density cells are removed from the cultures daily in an attempt to maintain the target cell concentration, and variations in this removal procedure can cause fluctuations in cell density, culture viability and antibody concentration.
  • the bioreactor with 0.74 ⁇ M Zn+2 had lower cell growth rate, lower culture viability and a lower antibody concentration prior to reaching target cell density than the bioreactors containing 1.5 and 2.5 ⁇ M Zn+2.
  • the bioreactor with 1.0 ⁇ M Zn+2 exhibited performance in each case that was intermediate between the bioreactors with 0.74 ⁇ M and the bioreactors with 1.5 or 2.5 ⁇ M Zn+2.
  • the conditions of this experiment were favorable to Zn+2 accumulation by the SP2/0 cells.
  • the [EDTA-Fe+3] is less than zero, indicating that all EDTA is chelated to Fe+3 and not available to chelate Zn+2 in the extracellular medium.
  • BSA another potential chelator
  • the extracellular Zn+2 concentration is sufficiently high that the cellular enzymes do not experience Zn+2 deficiency at any point in the culture.
  • CTL removal is at a high rate from Day 20 through Day 60.
  • cell growth, culture viability and antibody production proceed at high rates as a function of culture day.
  • the DOE3 experiment included twelve bioreactors.
  • the medium for this experiment was commercial SFM-10 medium.
  • the chosen lots of PRIMATON ER), insulin, transferrin and BSA created basal levels of 0.76 ⁇ M Zn+2, 5.9 ⁇ M EDTA, and 0.9 ⁇ M Fe+3.
  • a matrix of experimental conditions was created by supplementation of Zn+2, EDTA, and/or Fe+3, as indicated in Table 2.
  • the total Zn+2 concentration ranged from 0.76 to 1.7 ⁇ M
  • the Fe+3 concentration ranged from 0.90 to 5.4 ⁇ M
  • the EDTA concentration ranged from 5.9 to 26.8 ⁇ M
  • [EDTA-Fe+3] ranged from 0.53 to 23.6 ⁇ M.
  • FIG. 8A is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on CTL removal in the presence of 0.76 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5 Zn:1 EDTA:10” was 6.3 ⁇ M, rather than 0.76 ⁇ M; the targeted concentration of 0.76 ⁇ M Zn +2 was implemented from Day 13 until the end of the experiment).
  • FIG. 8A is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on CTL removal in the presence of 0.76 ⁇ M Zn +2 (the initial concentration of Zn +2 in the bioreactor corresponding to the label “Fe:5
  • FIG. 8B is a graph of CTL removal (expressed as percentage of des-Lys and computed using the cIEF method from Peak 1 data) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on CTL removal in the presence of 1.7 ⁇ M Zn +2 .
  • the bioreactors from the DOE3 experiment exhibited a strong relationship between percentage of CTL removal and Zn+2 concentration.
  • the bioreactors with 0.76 ⁇ M Zn+2 exhibited significantly lower percent CTL removal than the bioreactors with 1.7 ⁇ M Zn+2.
  • the bioreactors with the higher Zn+2 concentration exhibited 60 to 75% CTL removal at early, middle and late periods of culture.
  • the bioreactors with a lower concentration of Zn+2 exhibited 40% CTL removal at Days 10-20, and the CTL removal gradually rose as a function of culture day, approaching 60% CTL removal at the end of the cultures.
  • the bioreactor labeled “Fe:5, Zn:1, EDTA:10” experienced a very high Zn+2 concentration of 6.3 ⁇ M prior to Day 13, which correlates to 80% CTL removal in the early stages of culture, the highest CTL removal achieved in this study.
  • the percentage of CTL removal in this bioreactor gradually dropped following the correction of its medium concentration to 0.76 ⁇ M Zn+2 on Day 13. With a perfusion rate of approximately 0.7 culture volumes per day, the Zn+2 concentration in the production bioreactor would have fallen to 0.76 ⁇ M within 10 days or less. Yet, the percentage of CTL removal remained much higher in this bioreactor than in its sister bioreactors at 0.76 ⁇ M Zn+2. That is, the cells seem to have a mechanism that “remembers” past Zn+2 exposure.
  • this cellular “memory” relates to the accumulation of Zn+2 inside the cells. This accumulated Zn+2 cannot be reversed by a sudden reduction in extracellular Zn+2 concentration. It is likely that the accumulated Zn+2 per cell can only be reduced by subsequent cell division, in which accumulated Zn+2 is divided between daughter cells. Under the conditions of the DOE3 experiment, the extent of cell division was limited after the cells reached the target cell density on approximately Day 15-20.
  • FIGS. 9A and 9B show that there is a significant difference in sialic acid content as a function of [Zn+2] in the DOE3 experiment.
  • sialic acid content As a function of [Zn+2] in the DOE3 experiment.
  • FIG. 9B At days 10-20, there is significantly higher sialic acid content in the bioreactors with 1.7 ⁇ M Zn+2 ( FIG. 9B ) than in the bioreactors at 0.76 ⁇ M ( FIG. 9A ).
  • the difference in sialic acid content narrows, but is still higher at 1.7 ⁇ M Zn+2 than at 0.76 ⁇ M Zn+2.
  • FIGS. 9A and 9B are also evidence of the cellular “Zn+2 memory” discussed above.
  • bioreactor “Fe:5, Zn:1, EDTA:10” the sialic acid content was very high at the earliest time point for this bioreactor, and remained much higher than its sister bioreactors having 0.76 ⁇ M Zn+2 throughout the culture period, in spite of the fact that the extracellular Zn+2 concentrations in all of the bioreactors would have been the same by approximately Day 20.
  • the sialic acid content at Days 10 and 13 for bioreactor “Fe:5, Zn:1, EDTA:10” is approximately 18%, significantly higher than for the bioreactors having 1.7 ⁇ M Zn+2. This suggests that, under the experimental conditions of the DOE3 experiment, 1.7 ⁇ M Zn+2 is not sufficient to saturate the cells need for Zn+2 to support sialic acid addition.
  • FIG. 9A shows that among the bioreactors with 0.7 ⁇ M Zn+2, the sialic acid content at Day 38 increases as [EDTA] decreases.
  • FIG. 9B shows that at Days 20 and 38, sialic acid content increases as [EDTA] decreases.
  • the five bioreactors with 0.76 ⁇ M Zn+2 had a much lower cell growth rate during the first 20 days (prior to reaching target cell density) than the six bioreactors that had 1.7 ⁇ M Zn+2 ( FIG. 10 ).
  • the bioreactor labeled “Fe:5, Zn:1, EDTA:10” experienced a very high Zn+2 concentration of 6.3 ⁇ M prior to Day 13.
  • This bioreactor exhibited cell growth behavior in the period prior Day 20 that matched the bioreactors with 1.7 ⁇ M Zn+2.
  • FIGS. 11A and 11B show that the culture viability of the five bioreactors with 0.76 ⁇ M Zn+2 was lower during the first 30 days than the culture viability of the six bioreactors with 1.7 ⁇ M Zn+2.
  • the bioreactor labeled “Fe:5, Zn:1, EDTA:10” exhibited high culture viability at Day 10 and 13, but then reverted to match its sister bioreactor with a Zn+2 concentration of 0.76 ⁇ M soon after the Zn+2 concentration was corrected. This supports the hypothesis that culture viability is related to the instantaneous concentration of extracellular Zn+2, not to Zn+2 stores within the cell.
  • FIGS. 12A and 12B show that the antibody concentration of the five bioreactors with 0.76 ⁇ M Zn+2 was lower for the first 20 days than the six bioreactors with 1.7 ⁇ M Zn+2.
  • the bioreactor labeled “Fe:5, Zn:1, EDTA:10” exhibited antibody concentration comparable to the bioreactors at 1.7 ⁇ M Zn+2, supporting the hypothesis that antibody production is related to accumulated Zn+2 rather than to the instantaneous value of extracellular Zn+2.
  • FIGS. 10 , 11 A, 11 B, 12 A and 12 B show that there is no clear correlation between [EDTA] and viable cell density, culture viability and antibody concentration in the DOE3 results.
  • the DOE3 experiment included a range of [Zn+2], [EDTA], and [EDTA-Fe+3].
  • [EDTA-Fe+3] ranged from 0.5 to 23 ⁇ M.
  • the dominant factor in the outcome of these experiments was the extracellular concentration of Zn+2, ranging from 0.76 ⁇ M to 1.7 ⁇ M (and initially 6.3 ⁇ M in bioreactor “Fe:5, Zn:1, EDTA:10”).
  • Bioreactors with extracellular Zn+2 of 1.7 ⁇ M had significantly higher CTL removal, sialic acid content, initial cell growth, initial culture viability, and initial antibody production than bioreactors with extracellular Zn+2 of 0.76 ⁇ M ( FIGS. 8A , 8 B, 9 A, 9 B, 10 , 11 A, 11 B, 12 A and 12 B).
  • the bioreactor “Fe:5, Zn:1, EDTA:10” experienced a very high Zn+2 concentration of 6.3 ⁇ M prior to Day 13, then was returned to the targeted Zn+2 concentration of 0.76 ⁇ M.
  • This bioreactor exhibited comparable initial cell growth ( FIG. 10 ), culture viability ( FIGS. 11A and 11B ) and antibody productivity ( FIGS. 12A and 12B ) to the bioreactors with 1.7 ⁇ M Zn+2.
  • this bioreactor exhibited greater initial CTL removal and sialic acid content than the bioreactors at 1.7 ⁇ M Zn+2.
  • This bioreactor exhibited a “memory” for the initial high Zn+2 concentration that extended well beyond the correction of extracellular Zn+2 concentration for CTL removal, sialic acid content, cell density and antibody production ( FIGS. 8A , 8 B, 9 A, 9 B, 10 , 12 A and 12 B). However, this bioreactor did not exhibit a memory for culture viability; that is, the culture viability corrected without delay as the extracellular Zn+2 concentration fell from 6.3 ⁇ M to 0.76 ⁇ M ( FIGS. 11A and 11B ).
  • FIGS. 9C and 9D are graphs of percentage of G0F (WAX Component 1) as a function of bioreactor age, and shows the effect of varying EDTA concentrations on the percentage of non-galactosylated species in the presence of 0.76 ⁇ M Zn +2 and 1.7 ⁇ M Zn +2 .
  • BSA Blending Experiment No. 1 employed eight bioreactors, with duplication bioreactors at four EDTA concentrations. Duplicate bioreactors in BSA Blending Experiment No. 1 are labeled as “A” and “B”.
  • BSA Blending Experiment No. 2 employed eight bioreactors, each with a different EDTA concentration. Tables 3 and 4 list the Zn+2, Fe+3, EDTA and EDTA-Fe concentrations in the bioreactors in BSA Blending Experiments No. 1 and No. 2.
  • Infliximab bioreactors are operated in the first 15-20 days in a manner that resembles fed-batch culture. That is, cells are inoculated to a low initial cell density, and are continuously fed for the next 15 to 20 days with fresh medium to support cell growth and antibody expression. Therefore, the experimental results described herein apply equally to fed-batch and perfusion cultures.
  • DOE3 and BSA Blending experiments were all conducted in the same laboratory using the same small-scale bioreactor model, and the samples were analyzed by the same assay group. Therefore, it should be possible to compare the results of the DOE3 and BSA Blending No. 1 and No. 2 experiments with one another.
  • FIGS. 17 , 19 , 20 and 21 show the Day 20 data from the DOE3 experiment and the BSA Blending No. 1 experiment plotted together.
  • the results shown in FIGS. 17 , 19 and 20 support previous analyses, namely, that CTL removal increases with increasing [Zn+2], sialic acid content increases with increasing [Zn+2], and the percentage of agalactosyl oligosaccharides decreases with increasing [Zn+2]. These latter two results are consistent with promotion of the enzyme reactions for galactose addition and sialic acid addition, as shown in FIG. 16 .
  • FIG. 21 shows that the ratio of sialic acid to galactose increases with increasing [Zn+2].
  • FIG. 26 is a graph of percentage of sialic acid (WAX Component 5) as a function of percentage of G0F (the dominant agalactosyl component of WAX Component 1), and shows the inverse relationship between perentage of sialic acid and the percentage of agalactosyl oligosaccharides, for the DOE3 and BSA Blending No. 1 and No. 2 experiments.
  • FIG. 26 shows that galactose addition and sialic acid addition tend to be coupled in the DOE3 and BSA Blending No. 1 and No. 2 experiments, consistent with a coupling of the reactions catalyzed by galactosyltransferase and sialyltransferase. In other words, factors that enhance these two glycosylation reactions direct more G0F to oligosaccharides containing sialic acid.
  • the BSA Blending No. 1 and No. 2 experiments both included a sample collected at Days 33-35.
  • FIGS. 22-25 show the Day 33-35 data from the BSA Blending No. 1 and No. 2 experiments.
  • FIGS. 22-25 show that at lower EDTA concentrations, there is higher CTL removal, higher sialic acid content, lower percentage of agalactosyl oligosaccharides, and a higher ratio of sialic acid to galactose.

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