WO2007117505A2 - Polypeptides with enhanced anti-inflammatory and decreased cytotoxic properties and relating methods - Google Patents
Polypeptides with enhanced anti-inflammatory and decreased cytotoxic properties and relating methods Download PDFInfo
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- WO2007117505A2 WO2007117505A2 PCT/US2007/008396 US2007008396W WO2007117505A2 WO 2007117505 A2 WO2007117505 A2 WO 2007117505A2 US 2007008396 W US2007008396 W US 2007008396W WO 2007117505 A2 WO2007117505 A2 WO 2007117505A2
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/06—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies from serum
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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
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P21/00—Preparation of peptides or proteins
- C12P21/005—Glycopeptides, glycoproteins
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6854—Immunoglobulins
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
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- 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
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- 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
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- 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
- C07K2317/71—Decreased effector function due to an Fc-modification
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- 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
Definitions
- the present invention relates to novel methods for designing therapeutic polypeptides for treatment of inflammatory diseases.
- cellular receptors for immunoglobulins were first identified nearly 40 years ago, their central role in the immune response was only discovered in the last decade . They are key players in both the afferent and efferent phase of an immune response, setting thresholds for B cell activation and antibody production, regulating the maturation of dendritic cells and coupling the extraordinar specificity of the antibody response to effector pathways, such as phagocytosis, antibody dependent cellular cytotoxicity and the recruitment and activation of inflammatory cells.
- effector pathways such as phagocytosis, antibody dependent cellular cytotoxicity and the recruitment and activation of inflammatory cells.
- Their central role in linking the humoral immune system to innate effector cells has made them attractive immunotherapeutic targets for either enhancing or restricting the activity of antibodies in vivo.
- ADCC antibody dependent cell-mediated cytotoxicity
- CDC complement dependent cytotoxicity
- Antibody constant domains are not involved directly in binding an antibody to an antigen, but exhibit various effector functions.
- antibodies or immunoglobulins can be assigned to different classes .
- the heavy chain constant regions that correspond to the different classes of immunoglobulins are called ⁇ , ⁇ , ⁇ , ⁇ , and ⁇ , respectively.
- human immunoglobulin classes human IgGl and IgG3 mediate ADCC more effectively than IgG2 and IgG4.
- Papain digestion of antibodies produces two identical antigen binding fragments, called Fab fragments, each with a single antigen binding site, and a residual "Fc" fragment, whose name reflects its ability to crystallize readily.
- the Fc region is central to the effector functions of antibodies.
- the crystal structure of the human IgG Fc region has been determined (Deisenhofer, Biochemistry, 20, 2361-2370 (1981) , which is incorporated herein by reference) .
- the Fc region is generated by papain cleavage N-terminal to Cys, 226. IgG has long been appreciated to mediate both pro- and anti-inflammatory activities through interactions mediated by its Fc fragment.
- IgG intravenous gamma globulin
- IgG contains a single, N-linked glycan at Asn 297 in the CH2 domain on each of its two heavy chains .
- the covalently- linked, complex carbohydrate is composed of a core, biantennary penta-polysaccharide containing N- acetylglucosamine (GIcNAc) and mannose (man) . Further modification of the core carbohydrate structure is observed in serum antibodies with the presence of fucose, branching GIcNAc, galactose (gal) and terminal sialic acid (sa) moieties variably found. Over 40 different glycoforms have thus been detected to be covalently attached to this single glycosylation site. Fuj ii et al . , J.
- the invention provides a polypeptide containing at least one IgG Fc region, said polypeptide having a higher antiinflammatory activity and a lower cytotoxic activity as compared to an unpurified antibody.
- the polypeptide comprises a human IgGl, IgG2, IgG3 or IgG4 Fc region, said polypeptide having a higher sialic acid content as compared to an unpurified antibody.
- the instant invention provides a pharmaceutical formulation comprising a polypeptide containing at least one Fc region having a higher antiinflammatory activity and a lower cytotoxic activity, in combination with a suitable carrier or diluent.
- the invention provides a method of preparation of a polypeptide containing at least one Fc region, said polypeptide having a higher anti-inflammatory activity and a lower cytotoxic activity than an unpurified antibody, the method comprising: providing an unpurified source of the polypeptide containing at least one Fc region, the unpurified source of the polypeptide containing at least one Fc region comprising a plurality of polypeptides containing at least one IgG Fc region having sialic acid and a plurality of polypeptides containing at least one IgG Fc region lacking sialic acid; and increasing the ratio of the plurality of the polypeptides containing at least one IgG Fc region having sialic acid to the plurality of the polypeptides containing at least one IgG Fc region lacking sialic acid.
- the ratio of the plurality of the polypeptides containing at least one IgG Fc region having sialic acid to the plurality of the polypeptides containing at least one IgG Fc region lacking sialic acid is achieved either through a removal of the polypeptides containing at least one IgG Fc region lacking sialic acid or through a sialylation of the unpurified source the of polypeptides containing at least one IgG Fc region.
- Figure 1 demonstrates carbohydrate spectra of 6A6-IgG antibody isotypes.
- N-glycans derived from 6A6-IgGl, IgG2a and IgG2b were analyzed by MALDI-TOP MS. Peaks containing sialic acid residues are indicated by the bracket.
- Recombinant 6A6 antibody switch variants produced by transient transfection of 293T cells contained minimal levels of sialic acid residues in their Asn-297 attached carbohydrates .
- Figure 2 shows that sialylation reduces IgG cytotoxicity.
- Variable residues such as the terminal and bisecting sugars are underlined and specific linkages are indicated. Cleavage sites for PNGase and neuraminidase are also indicated. This fully processed structure is present in about 5% of the total serum IgG pool (1).
- B Enrichment of 6A6-IgGl and IgG2b antibodies with high sialic acid content via Samb ⁇ cus nigra agglutinin (SNA) affinity chromatography.
- Figure 3 illustrates that antibody activity in vivo is modulated by sialic acid.
- 6A6-IgGl was enriched for sialic acid by affinity chromatography with SNA-agarose. A fraction of this SNA-enriched preparation was treated with neuraminidase (SNA-enriched + Neuraminidase) .
- SNA-enriched + Neuraminidase neuraminidase
- Sialic acid content in antibody preparations was determined by lectin blotting with SNA.
- Figure 4 demonstrates that anti-inflammatory activity of IVIG requires sialic acid.
- PNGaseF-treated IVIG PNGaseF IVIG
- mice were treated with neuraminidase-treated IVIG (NA IVIG) or SNA-enriched IVIG
- SNA IVIG SNA IVIG
- D Carbohydrate profiles of IVIG preparations. MALDI-TOF-MS profiles of N- glycans derived from untreated or neuraminidase-treated IVIG are shown. Peaks that contain sialic acid residues are indicated by a bracket and the carbohydrate composition of the peaks are presented in Fig. 5.
- IVIG was either left untreated (Iane2) or treated with a neuraminidase specific for 2,3 linked sialic acid residues
- Figure 5 illustrates the composition of the carbohydrate moieties released from N297 IgG Fc.
- the core sugar structure linked to the asparagine residue 297 in the antibody heavy chain is composed of N-acetylglucosamine (GIcNAc) and mannose (Man) .
- Individual glycoforms vary with respect to attachment of one or two terminal galactose (Gal) residues, attachment of terminal sialic acid- (N- acetylneuraminic acid or Neu5Ac for human and N- glycolylneuraminic acid or Neu5Gc for mouse) residues, and/or the attachment of bisecting GlcNAc or fucose (Fuc) .
- Numbers indicate the molecular weight of the different sugar compositions as determined by MALDI-TOF MS. The mass for the glycan structures are indicated for human and mouse (underlined) .
- Figure 6 illustrates serum half-life and protein integrity of de-sialylated IVIG.
- B Ten microgram of IVIG or de- sialylated IVIG were resolved by SDS-PAGE using an 8% polyacrylamide gel under non-reduced conditions and visualized with coomassie brilliant blue staining. The monomeric composition and structural integrity of IVIG were not affected by neuraminidase treatment.
- Figure 7 demonstrates serum half-life and subclass composition of SNA-enriched IVIG.
- B IgG subclasses in untreated and SNA-enriched IVIG were determined by ELISA. No differences were observed.
- Figure 8 illustrates that sialylated proteins with similar carbohydrate structures do not protect mice from K/BxN serum induced arthritis .
- Figure 9 demonstrates that anti-inflammatory activity of SNA enriched IVIG requires Fc ⁇ RIIB.
- B Jn vivo accumulation of Fc ⁇ RIIB + monocytes by SNA-enriched IVIG.
- Figure 10 demonstrates that active immunization results in reduced IgG sialylation.
- A Serum IgG from untreated (preimmune) or mice with nephrotixic nephritis (NTN) induced by immunization with sheep IgG and nephrotoxic serum (NTS) was characterized for sialic acid content by blotting with Sambucus nigra agglutinin (SNA) (see methods) .
- SNA Sambucus nigra agglutinin
- the inventors have surprisingly found that the cytotoxic and anti-inflammatory response of the IgG Fc domain results from the differential sialylation of the Fc- linked core polysaccharide.
- the cytotoxicity of IgG antibodies is reduced upon sialylation; conversely, the anti-inflammatory activity of IVIG is enhanced.
- IgG sialylation is shown to be regulated upon the induction of an antigen-specific immune response, thus providing a novel means of switching IgG from an innate, anti-inflammatory molecule in the steady-state, to a adaptive, proinflammatory species upon antigenic challenge. Accordingly, the instant disclosure provides an advantageous strategy of creating and selecting IgGs with desired cytotoxic and anti-inflammatory potential.
- the numbering of the residues in an immunoglobulin heavy chain is that of the EU index as in Kabat et al . , Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md. (1991), which is expressly incorporated herein by reference.
- the "EU index as in Kabat” refers to the residue numbering of the human IgGl EU antibody.
- the term "native" or “parent” refers to an unmodified polypeptide comprising an Fc amino acid sequence.
- the parent polypeptide may comprise a native sequence Fc region or an Fc region with pre-existing amino acid sequence modifications (such as additions, deletions and/or substitutions) .
- polypeptide refers to any fragment of a protein containing at least one IgG Fc region, including, without limitation, fully functional proteins, such as, for example, antibodies, e.g., IgG antibodies.
- Fc region is used to define a C-terminal region of an immunoglobulin heavy chain.
- the "Fc region” may be a native sequence Fc region or a variant Fc region.
- the human IgG heavy chain Fc region is usually defined to stretch from an amino acid residue at position Cys226, or from Pro230, to the carboxyl-terminus thereof.
- the "CH2 domain" of a human IgG Fc region usually extends from about amino acid 231 to about amino acid 340.
- the CH2 domain is unique in that it is not closely paired with another domain. Rather, two N-linked branched carbohydrate chains are interposed between the two CH2 domains of an intact native IgG molecule. It has been speculated that the carbohydrate may provide a substitute for the domain-domain pairing and help stabilize the CH2 domain (Burton, MoI Immunol, 22, 161- 206 (1985) , which is incorporated herein by reference) .
- the "CH3 domain” comprises the stretch of residues C- terminal to a CH2 domain in an Fc region (i.e., from about amino acid residue 341 to about amino acid residue 447 of an IgG) .
- the term "hinge region” is generally defined as stretching from Glu216 to Pro230 of human IgGl (Burton
- Hinge regions of other IgG isotypes may be aligned with the IgGl sequence by placing the first and last cysteine residues forming inter-heavy chain S--S bonds in the same positions.
- binding domain refers to the region of a polypeptide that binds to another molecule .
- the binding domain can comprise a portion of -a polypeptide chain thereof (e.g., the ⁇ chain thereof) which is responsible for binding an Fc region.
- One exemplary binding domain is the extracellular domain of an FcR chain.
- a “functional Fc region” possesses at least a partial “effector function” of a native sequence Fc region.
- effector functions include CIq binding; complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell-mediated cytotoxicity (ADCC) ,- phagocytosis; down regulation of cell surface receptors
- effector functions generally require the Fc region to be combined with a binding domain (e.g., an antibody variable domain) and can be assessed using various assays as herein disclosed, for example.
- a binding domain e.g., an antibody variable domain
- a “native sequence Fc region” comprises an amino acid sequence identical to the amino acid sequence of an Fc region found in nature.
- a “variant Fc region” as appreciated by one of ordinary skill in the art comprises an amino acid sequence which differs from that of a native sequence Fc region by virtue of at least one "amino acid modification. "
- the variant Fc region has at least one amino acid substitution compared to a native sequence Fc region or to the Fc region of a parent polypeptide, e.g., from about one to about ten amino acid substitutions, and preferably from about one to about five amino acid substitutions in a native sequence Fc region or in the Fc region of the parent polypeptide.
- the variant Fc region herein will preferably possess at least about 80% homology with a native sequence Fc region and/or with an Fc region of a parent polypeptide, and more preferably at least about 90% homology therewith, more preferably at least about 95% homology therewith, even more preferably, at least about 99% homology therewith.
- altered glycosylation refers to a polypeptide, as defined above, be it native or modified, in which the carbohydrate addition to the heavy chain constant region is manipulated to either increase or decrease specific sugar components.
- polypeptides such as, for example, antibodies, prepared in specific cell lines, such as, for example, Lec2 or Lec3, may be deficient in the attachment of sugar moieties such as fucose and sialic acid.
- Fc receptor or “FcR” are used to describe a receptor that binds to the Fc region of an antibody.
- FcR is a native sequence human FcR.
- FcR, including human FcR binds an IgG antibody (a gamma receptor) and includes receptors of the FcyRI, Fc ⁇ RII, and Fc ⁇ RIII subclasses, including allelic variants and alternatively spliced forms of these receptors.
- Fc ⁇ RII receptors include FcyRIIA (an "activating receptor") and Fc ⁇ RIIB (an “inhibiting receptor”), which have similar amino acid sequences that differ primarily in the cytoplasmic domains thereof.
- Activating receptor Fc ⁇ RIIA contains an immunoreceptor tyrosine-based activation motif (ITAM) in its cytoplasmic domain.
- Inhibiting receptor Fc ⁇ RIlB contains an immunoreceptor tyrosine-based inhibition motif (ITIM) in its cytoplasmic domain (see review in Daron, Annu Rev Immunol, 15, 203-234 (1997) ; FcRs are reviewed in Ravetch and Kinet, Annu Rev Immunol, 9, 457-92 (1991) ; Capel et al., Immunomethods, 4, 25-34 (1994); and de Haas et al .
- ITAM immunoreceptor tyrosine-based activation motif
- ITIM immunoreceptor tyrosine-based inhibition motif
- Antibody-dependent cell-mediated cytotoxicity and “ADCC” refer to an in vitro or in vivo cell-mediated reaction in which cytotoxic cells that express FcRs (e.g., monocytic cells such as natural killer (NK) cells and macrophages) recognize bound antibody on a target cell and subsequently cause lysis of the target cell.
- FcRs e.g., monocytic cells such as natural killer (NK) cells and macrophages
- NK natural killer
- any effector cell with an activating Fo ⁇ R can be triggered to mediate ADCC.
- the NK cell expresses Fc ⁇ RIII only, whereas monocytes, depending on their state of activation, localization, or differentiation, can express Fc ⁇ RI, FcyRII, and Fc ⁇ RIII.
- FcR expression on hematopoietic cells is summarized in Ravetch and Bolland, Annu Rev Immunol, (2001), which is incorporated herein by reference.
- Human effector cells are leukocytes which express one or more FcRs and perform effector functions.
- the cells express at least one type of an activating Fc receptor, such as, for example, FcyRlII and perform ADCC effector function.
- Examples of human leukocytes which mediate ADCC include peripheral blood mononuclear cells
- PBMC natural killer cells
- monocytes monocytes
- neutrophils neutrophils
- PBMCs and NK cells are preferred.
- the effector cells may be isolated from a native source thereof, e.g., from blood or PBMCs as described herein.
- antibody is used in the broadest sense and specifically covers monoclonal antibodies (including full length monoclonal antibodies) , polyclonal antibodies, multispecific antibodies (e.g., bispecific antibodies), and antibody fragments so long as they exhibit the desired biological activity.
- sialic acid content refers both to the total number of sialic acid residues on an Fc region of a heavy chain of an antibody and to the ratio of sialylated antibodies to asialylated antibodies in an unpurified antibody preparation, unless the phrase is in a context clearly suggesting that another meaning is intended.
- Antibody fragments comprise a portion of an intact antibody, generally including the antigen binding or variable region of the intact antibody or the Fc region of an antibody which retains FcR binding capability.
- antibody fragments include linear antibodies; single-chain antibody molecules; and multispecific antibodies formed from antibody fragments.
- the antibody fragments preferably retain at least part of the hinge and optionally the CHl region of an IgG heavy chain. More preferably, the antibody fragments retain the entire constant region of an IgG heavy chain, and include an IgG light chain.
- the term "monoclonal antibody” as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Monoclonal antibodies are highly specific, being directed against a single antigenic site. Furthermore, in contrast to conventional (polyclonal) antibody preparations that typically include different antibodies directed against different determinants (epitopes) , each monoclonal antibody is directed against a single determinant on the antigen.
- the modifier "monoclonal” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.
- the monoclonal antibodies to be used in accordance with the present invention may be made by the hybridoma method first described by Kohler and Milstein, Nature, 256, 495-497 (1975) , which is incorporated herein by reference, or may be made by recombinant DNA methods (see, e.g., U.S. Patent No. 4,816,567, which is incorporated herein by reference) .
- the monoclonal antibodies may also be isolated from phage antibody libraries using the techniques described in Clackson et al., Nature, 352, 624-628 (1991) and Marks et al . , J MoI Biol, 222, 581-597 (1991), for example, each of which is incorporated herein by reference.
- the polypeptide containing at least one IgG Fc region may be fused with other protein fragments, including, without limitation, whole proteins.
- proteins may be fused with the polypeptide of the present invention, including, without limitation, other immunoglobulins, especially, immunoglobulins lacking their respective Fc regions.
- other biologically active proteins or fragments thereof may be fused with the polypeptide of the present invention, as described, for example, in the U.S. Patent No. 6,660,843, which is incorporated herein by reference. This embodiment is especially advantageous for delivery of such biologically active proteins or fragments thereof to cells expressing Fc receptors.
- different markers such as, for example, GST tag or green fluorescent protein, or GFP, may be used.
- the monoclonal antibodies herein specifically include "chimeric" antibodies (immunoglobulins) in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain (s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (see U.S. Patent No. 4,816,567; Morrison et al . , Proc Natl Acad Sci USA, 81, 6851-6855
- Humanized forms of non-human (e.g., murine) antibodies are chimeric antibodies that contain minimal sequence derived from non-human immunoglobulin. For the most part, humanized antibodies are human immunoglobulins
- humanized antibodies in which residues from a hypervariable region of the recipient are replaced by residues from a hypervariable region of a non-human species (donor antibody) such as mouse, rat, rabbit or nonhuman primate having the desired specificity, affinity, and capacity.
- donor antibody such as mouse, rat, rabbit or nonhuman primate having the desired specificity, affinity, and capacity.
- Fv framework region (FR) residues of the human immunoglobulin are replaced by corresponding non-human residues.
- humanized antibodies may comprise residues that are not found in the recipient antibody or in the donor antibody. These modifications are made to further refine antibody performance.
- the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervariable loops correspond to those of a non-human immunoglobulin and all or substantially all of the FR residues are those of a human immunoglobulin sequence.
- the humanized antibody optionally also will comprise at least a portion of an immunoglobulin constant region (Fc) , typically that of a human immunoglobulin.
- Fc immunoglobulin constant region
- the polypeptides containing at least one IgG Fc region include those in which specific amino acid substitutions, additions or deletions are introduced into a parental sequence through the use of recombinant DNA techniques to modify the genes encoding the heavy chain constant region.
- the introduction of these modifications follows well- established techniques of molecular biology, as described in manuals such as Molecular Cloning (Sambrook and Russel, (2001) ) .
- polypeptides with at least one Fc region will include those polypeptides which have been selected to contain specific carbohydrate modifications, obtained either by expression in cell lines known for their glycosylation specificity (Stanley P., et al., GIycobIoIogy, 6, 695-9 (1996); Weikert S., et al . , Nature Biotechnology, 17, 1116-1121 (1999); Andresen DC and Krummen L., Current Opinion in Biotechnology, 13, 117-123 (2002)) or by enrichment or depletion on specific lectins or by enzymatic treatment (Hirabayashi et al., J Chromatogr B Analyt Technol
- the polypeptide of the present invention can be expressed in a host expression system, i.e., host cells, capable of N-linked glycosylation.
- a host expression system i.e., host cells, capable of N-linked glycosylation.
- host expression systems may comprise fungal, plant, vertebrate or invertebrate expression systems .
- the host cell is a mammalian cell, such as a Chinese hamster ovary (CHO) cell line, (e.g. CHO-Kl; ATCC CCL-61) , Green Monkey cell line (COS) (e.g. COS 1 (ATCC CRL-1650) , COS 7 (ATCC
- CHO Chinese hamster ovary
- COS Green Monkey cell line
- mice cell e.g. NS/0
- BHK cell line e.g. ATCC CRL-1632 or ATCC CCL-10
- human cell e.g. HEK 293 (ATCC CRL-1573)
- any other suitable cell line e.g.-, available from public depositories such as the American Type Culture Collection, Rockville, Md.
- an insect cell line such as a Lepidoptora cell line, e.g. Sf9, a plant cell line, a fungal cell line, e.g., yeast such as, for example, Saccharomyces cerevisiae, Pichia pastoris, Hansenula spp.
- Therapeutic formulations comprising the polypeptides containing at least one IgG Pc region can be prepared for storage by mixing the polypeptides of the present invention having the desired degree of purity with optional physiologically acceptable carriers, excipients or stabilizers (see, e.g., Remington's Pharmaceutical Sciences 16th edition, Osol, A. Ed. (1980)), in the form of lyophilized formulations or aqueous solutions.
- Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid and methionine,- preservatives (such as octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride, benzethonium chloride; phenyl, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben,- catechol; resorcinol; cyclohexanol; 3-pentanol; and tricresol) ; low molecular weight (less than about 10 residues) polypeptide; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutatnine, asparagine
- the formulations herein may also contain more than one active compound as necessary for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other. Such molecules are suitably present in combination in amounts that are effective for the purpose intended.
- the active ingredients may also be entrapped in a microcapsule prepared, for example, by coacervation techniques or by interfacial polymerization, for example, hydroxymethylcellulose or gelatin-microcapsule and poly-
- the formulations to be used for in vivo administration are sterile.
- the formulations of the instant invention can be easily sterilized, for example, by filtration through sterile filtration membranes.
- Sustained-release preparations may also be prepared. Suitable examples of sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the modified antibody, which matrices are in the form of shaped articles, e.g., films, or microcapsule. Examples of sustained-release matrices include polyesters, hydrogels (for example, poly (2-hydroxyethyl-methacrylate) , or poly (vinylal ⁇ ohol) ) , polylactides ⁇ see, e.g., U.S. Pat. No.
- copolymers of L-glutamic acid and y ethyl-L- glutamate non-degradable ethylene-vinyl acetate
- degradable lactic acid-glycolic acid copolymers such as the LUPRON DEPOTTM (injectable microspheres composed of lactic acid- glycolic acid copolymer and leuprolide acetate)
- poly-D- ( -) -3-hydroxybutyric acid While polymers such as ethylene- vinyl acetate and lactic acid-glycolic acid enable release of molecules for over 100 days, certain hydrogels release proteins for shorter time periods .
- encapsulated antibodies When encapsulated antibodies remain in the body for a long time, they may denature or aggregate as a result of exposure to moisture at 37 0 C, resulting in a loss of biological activity and possible changes in immunogenicity. Rational strategies can be devised for stabilization depending on the mechanism involved. For example, if the aggregation mechanism is discovered to be intermolecular S--S bond formation through thio-disulfide interchange, stabilization may be achieved by modifying sulfhydryl residues, lyophilizing from acidic solutions, controlling moisture content, using appropriate additives, and developing specific polymer matrix compositions.
- the polypeptides of the present invention can be further purified or modified so that they have an increased amount of sialic acid compared to unmodified and/or unpurified antibodies. Multiple methods exist to reach this objective.
- the source of unpurified polypeptides such as, for example, plasma fractions that contain IgG from which IVIG is routinely purified, is passed through the column having lectin, which is known to bind sialic acid.
- the lectin is isolated from Sambuccus nigra.
- the sialylated fraction of the polypeptides containing at least one IgG Fc region can be eluted by another wash with a different stringency conditions.
- a preparation of the polypeptide of the present invention wherein the content of sialic acid is increased compared to the normal content.
- one may employ an enzymatic reaction with a sialyltransferase and a donor of sialic acid as described, for example, in the U.S. Pat. No. 20060030521.
- sialyltransferase enzymes useful in the claimed methods are ST3Gal III, which is also referred to as ⁇ - (2, 3) sialyltransferase (EC 2.4.99.6), and ⁇ - (2 , 6 ⁇ sialyltransferase (EC 2.4.99.1).
- Alpha- (2, 3) sialyltransferase catalyzes the transfer of sialic acid to the Gal of a Gal- ⁇ -1, 3GIcNAc or Gal- ⁇ - 1,4GIcNAc glycoside (see, e.g., Wen et al . , J. Biol. Chem. 267: 21011 (1992); Van den Eijnden et al . , J. Biol. Chem. 256: 3159 (1991)) and is responsible for sialylation of asparagine-linked oligosaccharides in glycopeptides .
- the sialic acid is linked to a Gal with the formation of an cc- linkage between the two saccharides.
- Bonding (linkage) between the saccharides is between the 2-position of NeuAc and the 3-position of Gal.
- This particular enzyme can be isolated from rat liver (Weinstein et al., J. Biol. Chem. 257: 13845 (1982)); the human cDNA (Sasaki et al. (1993) J. Biol. Chem. 268: 22782-22787; Kitagawa & Paulson (1994) J.
- ⁇ - (2, 6) sialyltransferase results in 6- sialylated oligosaccharides, including 6-sialylated galactose.
- the name " ⁇ - (2, 6) sialyltransferase” refers to the family of sialyltransferases attaching sialic acid to the sixth atom of the acceptor polysaccharide.
- Different forms of a- (2, 6) sialyltransferase can be isolated from different tissues. For example, one specific form of this enzyme, ST6Gal II, can be isolated from brain and fetal tissues. Krzewinski-Recchi et al., Eur. J. Biochem. 270, 950 (2003) .
- cell culture conditions can be manipulated to change the sialylation rate. For example, to increase the sialic acid content, production rate is decreased and osmolality is generally maintained within a lower margin suitable for the particular host cell being cultured. Osmolality in the range from about 250 mOsm to about 450 raOsm is appropriate for increased sialic acid content.
- This and other suitable cell culture conditions are described in, e-g-, U.S. Patent No. 6,656,466. Patel et al .
- host cells such as, for example, immortalized human embryonic retina cells
- a nucleic acid encoding a sialyltransferase such as, for example, an ⁇ -2, 3- sialyltransferase or an ⁇ -2, 6-sialyltransferase, operably linked to a promoter, such as, for example, a CMV promoter.
- the ⁇ -2 , 3-sialyltransferase may be the human ⁇ -2, 3- sialyltransferase, known as SIAT4C or STZ (GenBank accession number L23767) , and described, for example, in the U.S. Pat. No. 20050181359.
- the nucleic acid encoding the sialyltransferase may be introduced into the host cell by any method known to a person of ordinary skill in the art . Suitable methods of introducing exogenous nucleic acid sequences are also described in Sambrook and Russel, Molecular Cloning: A Laboratory Manual (3 rd Edition) , Cold Spring Harbor Press, NY, 2000. These methods include, without limitation, physical transfer techniques, such as, for example, microinjection or electroporation; transfections, such as, for example, calcium phosphate transfections; membrane fusion transfer, using, for example, liposomes; and viral transfer, such as, for example, the transfer using DNA or retroviral vectors.
- the polypeptide containing at least one IgG Pc region may be recovered from the culture supernatant and can be subjected to one or more purification steps, such as, for example, ion-exchange or affinity chromatography, if desired. Suitable methods of purification will be apparent to a person of ordinary skill in the art. A person of ordinary skill in the art will appreciate that different combinations of sialylation methods, disclosed above, can lead to production of the polypeptides containing at least one IgG Fc region with an extremely high level of sialylation.
- an enzymatic reaction followed by affinity chromatography may be used for IVIG source of the polypeptides containing at least one IgG Fc region.
- these polypeptides can be purified and analyzed in SDS-PAGE under reducing conditions .
- the glyc ⁇ sylzation can be determined by reacting the isolated polypeptides with specific lectins, or, alternatively as would be appreciated by one of ordinary skill in the art, one can use HPLC followed by mass spectrometry to identify the glycoforms. (Wormald, MR et al., Biochem 36:1370 (1997).
- the anti-platelet antibodies derived from the 6A6 hybridoma, expressed as either an IgGl, 2a or 2b switch variant in 293 cells as previously described in Nitnmerjahn et al . , Immunity 23, 41 (2005) were analyzed by mass spectroscopy to determine their specific carbohydrate composition and structure (Figure 1) . These antibodies contain minimal sialic acid " residues .
- C57BL/6 and NOD mice were purchased from the Jackson Laboratory (Bar Harbor, ME) .
- FcyRIIB " '' ' mice were generated in the inventors' laboratory and backcrossed for 12 generations to the C57BL/6 background.
- KRN TCR transgenic mice on a C57BL/6 background (K/B) were gifts from D. Mathis and C. Benoist (Harvard Medical School, Boston, MA) and were bred to NOD mice to generate K/BxN mice.
- Female mice at 8-10 weeks of age were used for all experiments and maintained at the Rockefeller University animal facility. All experiments were done in compliance with federal laws and institutional guidelines and have been approved by the Rockefeller University (New York, NY) .
- 6A6 antibody switch variants were produced by transient transfection of 293T cells followed by purification via protein G as described in Nimmerjahn et al., Immunity 23, 41 (2005) and Nimmerjahn and Ravetch, Science 310, 1510 (2005) .
- Sialic acid rich antibody variants were isolated from these antibody preparations by lectin affinity chromatography with Sambucus nigra agglutinin (SNA) agarose (Vector Laboratories, Burlingame, CA). Enrichment for sialic acid content was verified by lectin blotting (see below) .
- SNA Sambucus nigra agglutinin
- IVIG Human intravenous immune globulin
- Fab and Fc resulting fragments were separated from non-digested IVIG on a HiPrep 26/60 S-200HR column (GE Healthcare, Piscataway, NJ), followed by purification of Fc and Fab fragments with a Protein G column (GE Healthcare) and a Protein L column (Pierce, Rockford, IL) . Fragment purity was checked by immunoblotting using anti-human IgG Fab or Fc-specific antibodies. (Jackson ImmunoResearch, West Grove, PA) . Purity was judged to be greater than 99%.
- the F4/80 antibody was from Serotec (Oxford, UK).
- the Ly 17.2 antibody was from Caltag (Burlingame, CA) .
- GBM sheep anti- glomerular basement membrane
- NTS neurotoxic serum
- Soluble Fc receptors containing a C-terminal hexa-hisitidine tag were generated by transient transfection of 293T cells and purified from cell culture supernatants with Ni-NTA agarose as suggested by the manufacturer (Qiagen) .
- IVIG was treated with neuraminidase and the composition and structure of the resulting preparation was analyzed by mass spectroscopy. No detectable sialic acid containing glycans remained after neuraminidase treatment ( Figure 4D, F and 5) .
- These IgG preparations were then tested for their ability to protect mice from joint inflammation induced by passive transfer of KxN serum, an IgG l immune complex- mediated inflammatory disease model. De-sialylation with neuraminidase abrogated the protective effect of the IVIG preparation in the KxN serum induced arthritis model ( Figure 4B,C,E>.
- sialic acid appeared to be required for the antiinflammatory activity of IVIG, the basis for the high dose requirement (1 g/kg) for this anti-inflammatory activity could be the limiting concentration of sialylated IgG in the total IVIG preparation.
- the IVIG was fractionated on an SNA- lectin affinity column to obtain IgG molecules enriched for sialic acid modified glycan structures. These sialic acid enriched fractions were tested for protective effects in the KxN serum transfer arthritis model as compared to unfractionated IVIG. A 10 fold enhancement in protection was observed for the SNA-binding fraction, such that equivalent protection was obtained at 0.1 g/kg of SNA- enriched IVIG as compared to 1 g/kg of unfractionated IVIG ( Figure 4B, C) .
- the serum half-life and IgG subclass distribution of the SNA enriched fraction was equivalent to that of unfractionated IVIG ( Figure 7A,B) .
- the effect of sialylation was specific to IgG; sialylated N-linked glycoproteins such as fetuin or transferrin with similar bi- antennary, complex carbohydrate structures had no statistically significant anti-inflammatory activity at equivalent molar concentrations of IgG ( Figure 8) .
- the mechanism of protection of the sialylated IVIG preparation was similar to unfractionated IVIG in that it was dependent on FcyRIIB expression and resulted in the increased expression of this inhibitory receptor on effector macrophages ( Figure 9) .
- mice are first sensitized with sheep IgG together with adjuvant and four days later injected with a sheep anti-mouse glomerular basement membrane preparation (nephrotoxic serum, NTS) . Briefly, mice were pre-immunized intraperitonealIy with 200 ⁇ g of sheep IgG (Serotec) in CFA, followed by intravenous injection of 2.5 ⁇ l of NTS serum per gram of body weight four days later.
- NTS neurotoxic serum
- Blood was collected from non-treated control mice four days after the anti-GBM anti-serum injection, and serum IgG was purified by Protein G (GE Healthcare, Princeton, NJ) and sepharose-bound sheep IgG column, generated by covalently coupling sheep IgG on NHS-activated sepharose column (GE Healthcare, Princeton, NJ) , affinity chromatography.
- Protein G GE Healthcare, Princeton, NJ
- sepharose-bound sheep IgG column generated by covalently coupling sheep IgG on NHS-activated sepharose column (GE Healthcare, Princeton, NJ) , affinity chromatography.
- mice IgG2b anti-sheep IgG antibodies (NTN immunized). Kaneko Y. et al., Exp. Med., 203:789 (2006).
- Mouse IgG2b antibodies are deposited in the glomerulus together with the NTS antibodies and result in an acute and fulminant inflammatory response by the IgG2b mediated activation of FcyRIV on infiltrating macrophages. In the absence of pre-sensitization inflammation is not observed, indicating that the mouse IgG2b anti-sheep IgG antibodies are the mediators of the inflammatory response.
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