WO2006074390A2 - Methods of treating obesity with combination therapeautics of igf-i fusion polypeptides - Google Patents
Methods of treating obesity with combination therapeautics of igf-i fusion polypeptides Download PDFInfo
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- WO2006074390A2 WO2006074390A2 PCT/US2006/000495 US2006000495W WO2006074390A2 WO 2006074390 A2 WO2006074390 A2 WO 2006074390A2 US 2006000495 W US2006000495 W US 2006000495W WO 2006074390 A2 WO2006074390 A2 WO 2006074390A2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P7/00—Drugs for disorders of the blood or the extracellular fluid
- A61P7/06—Antianaemics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/04—Inotropic agents, i.e. stimulants of cardiac contraction; Drugs for heart failure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/30—Non-immunoglobulin-derived peptide or protein having an immunoglobulin constant or Fc region, or a fragment thereof, attached thereto
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/70—Fusion polypeptide containing domain for protein-protein interaction
- C07K2319/74—Fusion polypeptide containing domain for protein-protein interaction containing a fusion for binding to a cell surface receptor
- C07K2319/75—Fusion polypeptide containing domain for protein-protein interaction containing a fusion for binding to a cell surface receptor containing a fusion for activation of a cell surface receptor, e.g. thrombopoeitin, NPY and other peptide hormones
Definitions
- This invention relates to insulin-like growth factor I (IGFI) and insulin-like growth factor 2 (IGF2) polypeptides, methods of producing such polypeptides, and therapeutic methods for administering such polypeptides.
- IGFI insulin-like growth factor I
- IGF2 insulin-like growth factor 2
- the insulin-like growth factors constitute a family of proteins having insulin-like and growth stimulating properties.
- the IGFs show close structural homology with proinsulin and elicit similar biological effects.
- Human IGFI also known as somatomedin C
- Human IGF2 is a 67 amino acid basic peptide having the protein and DNA sequences shown in SEQ ID NOs:3-4. Specific binding proteins of high molecular weight having very high binding capacity for IGF1 and IGF2 act as carrier proteins or as modulators of IGF1 functions (Holly et al. (1989) J. Endocrinol. 122:611-618).
- IGFI and IGF2 and variants thereof have been used to treat humans suffering from growth hormone deficiencies, tissue wasting including burns, skeletal trauma, infection, cancer, cystic fibrosis, Duchenne muscular dystrophy, Becker dystrophy, autosomal recessive dystrophy, polymyositis, as well as myopathies and AIDS (US Patent No. 5,622,932).
- the present invention comprises compositions and methods providing IGF1 and IGF2 variant molecules to a subject in need thereof. More specifically, the present invention provides fusion polypeptides comprising a therapeutic IGF1 or IGF2 variants or analogs thereof fused to a fusion component (F).
- the fusion polypeptides of the invention are capable of remaining therapeutically active and available for a longer period of time than the naturally occurring molecule and resist inactivation by an IGF binding protein.
- the fusion polypeptides of the invention can also be used in a variety of in vitro and in vivo diagnostic and prognostic assays. ,
- the invention features an IGF1 fusion polypeptide, comprising (a) at least one IGF1 variant component, (b) a fusion component (F), and optionally, (c) a signal sequence, wherein the IGF variant component is the human IGF1 protein of SEQ ID NO:1 comprising (i) a modification of the C-terminus selected from the group consisting of deletion of 3 to 6 amino acids, e.g., 68-70( ⁇ 68-70), ⁇ 67-70, ⁇ 66-70, ⁇ 65-70, deletion of Lys68( ⁇ 68), substitution of amino acid 68 with another amino acid, deletion of amino acids 65-70( ⁇ 65-70), deletion of Lys65( ⁇ 65), and substitution of amino acid 65 with another amino acid; (ii) a modification of the N-terminus selected from the group consisting of deletion of amino acids 1-3 ( ⁇ 1-3) and substitution of Glu3 with a different amino acid, and/or (iii) a modification at Arg36
- the IGF1 fusion protein has a deletion of amino acids 1-3 and Arg37 (2D-IGF1-Fc)( ⁇ 1-3, ⁇ Arg37). In another specific embodiment, the IGF1 fusion protein has a deletion of amino acids 1-3, Arg37 and amino acids 68-70 (3D-IGF1 -FC)( ⁇ 1-3, ⁇ Arg37, ⁇ 68-70).
- the invention features an IGF2 fusion polypeptide, comprising (a) at least one IGF2 variant component, (b) a fusion component (F), and optionally, (c) a signal sequence, wherein the IGF variant component is the human IGF2 protein of SEQ ID NO:3 comprising (i) a modification of the C-terminus selected from the group consisting of deletion of 3 amino acids, e.g., 65-67( ⁇ 65-67), deletion of Lys65( ⁇ 65), and substitution of amino acid 65 with another amino acid; (ii) a modification of the N-terminus selected from the group consisting of deletion of amino acids 1-6 ( ⁇ 1-6) and substitution of Glu6 with a different amino acid, and/or (iii) a modification at Arg37 and/or Arg38 selected from the group consisting of deletion of Arg37 ( ⁇ 37), deletion of Arg 38 ( ⁇ 38), substitution of Arg37 with a different amino acid, e.g., Arg37Ala
- the fusion component (F) is any component that enhances the functionality of the fusion polypeptide.
- an F may enhance the biological activity of the fusion polypeptide, aid in its production and/or recovery, or enhance a pharmacological property or the pharmacokinetic profile of the fusion polypeptide by, for example, enhancing its serum half-life, tissue penetrability, lack of immieuxicity, or stability.
- the fusion component allows the IGF variant component to evade serum binding proteins which may sequester IGF into a less biologically active compartment.
- F is a multimerizing component from the group consisting of (i) an amino acid sequence between 1 to about 500 amino acids in length, optionally comprising at least one cysteine residue, (ii) a leucine zipper, (iii) a helix loop motif, (iv) a coil-coil motif, and (v) an immunoglobulin domain.
- the fusion component comprises an immunoglobulin-derived domain from, for example, human IgG, IgM or IgA.
- the immunoglobulin-derived domain is selected from the group consisting of the Fc domain and the heavy chain of IgG.
- the Fc domain of IgG may be selected from the isotypes IgGI , lgG2, lgG3, and lgG4, as well as any allotype within each isotype group.
- the invention features an IGF1 fusion polypeptide, comprising (i) an IGF1 variant component comprising the human IGF1 protein of SEQ ID NO:1 comprising deletion of amino acids 1-3 ( ⁇ 1-3 or delGPE), deletion of Arg36 ( ⁇ 36), and a deletion of 3-6 amino acids at the C-terminus( ⁇ 68-70), (ii) an Fc domain of an IgG, and optionally, (iii) a signal sequence.
- the invention features an IGF2 fusion polypeptide, comprising (i) an IGF2 variant component comprising the human IGF2 protein of SEQ ID NO:3 comprising deletion of amino acids 1-6 ( ⁇ 1-6 or delAYRPSE), deletion of Arg37 ( ⁇ 37), and a deletion of 3 amino acids at the C-terminus ( ⁇ 65-67), (ii) an Fc domain of an IgG, and optionally, (iii) a signal sequence.
- the fusion component (F) is a targeting ligand, or derivative or fragment thereof, capable of binding specifically to a pre-selected cell surface protein, and thereby delivering said IGF1 or IGF2 to a target cell, e.g. a muscle cell.
- the targeting component is MuSK ligand, or a fragment of a MuSK ligand capable of binding the MuSK receptor.
- the MuSK-specific ligand is agrin or a fragment or derivative thereof capable of binding MuSK, or an anti-MuSK antibody or fragment or derivative thereof, including, for example, an scFv.
- the muscle-targeting ligand of the muscle-targeting fusion polypeptide comprises three or more muscle cadherin (M- cadherin) extracellular cadherin domains, or derivatives or fragments thereof, capable of binding specifically to a muscle cells or other cells that express homophilic muscle cadherins.
- the muscle-targeting ligand consists essentially of the first three (3) or four (4) N-terminal extracellular domains of M-cadherin.
- the fusion component (F) of the invention is another active compound, which may be any agent that is desirable to deliver to a pre-selected site for therapeutic purposes.
- the active or therapeutic agent is a ligand for a second cell surface receptor, and is capable of binding and activating a second receptor.
- the active or therapeutic agent is an agent capable of blocking the activity of another agent that is active on the target cell.
- the active or therapeutic agent is selected from the group consisting of IL-15, myotrophin, urocortin, urocortin II, a natural or mutant IGF1 or IGF2, insulin, the pro domain of myostatin, hGH, proliferin, follistatin, FSTL1 , and FLRG, and a biologically active fragments thereof.
- the polypeptide or fusion polypeptide of the invention may further optionally encode a signal sequence (SS) component.
- SS signal sequence
- any SS known to the art may be used, including synthetic or natural sequences from any source, for example, from a secreted or membrane bound protein.
- a signal sequence is placed at the beginning or amino-terminus of the fusion polypeptide of the invention.
- the components of the fusion polypeptides of the invention may be connected directly to each other or connected via one or more spacer sequences.
- the components are fused directly to each other.
- the components are connected with a spacer of 1-200 amino acids. Any spacer known to the art may be used to connect the polypeptide components.
- a spacer sequence may also include a sequence used to enhance expression of the fusion polypeptide, provide restriction sites, allow component domains to form optimal tertiary and quaternary structures and/or to enhance the interaction of a component with its receptor.
- the fusion polypeptide of the invention comprises one or more peptide sequences between one or more components which is (are) between 1-25 amino acids.
- the components of the fusion polypeptide of the invention may be arranged in a variety of configurations and may comprise more than one IGF variant polypeptide, for example, IGF-F; IGF-IGF-F; IGF-F-IGF; F-IGF; F-IGF-IGF, etc.
- F is an Fc
- the Fc must be on the C terminus of the fusion polypeptide.
- a second active component such as human growth hormone (hGH)
- the configuration must be IGF variant-hGH.
- the invention features a nucleic acid encoding a fusion polypeptide of the invention.
- the invention features a vector comprising a nucleic acid molecule of the invention.
- the invention encompasses vectors comprising the nucleic acid molecules of the invention, including expression vectors comprising the nucleic acid molecules operatively linked to an expression control sequence, and host-vector systems for the production of a fusion polypeptide which comprise the expression vector, in a suitable host cell; host-vector systems wherein the suitable host cell is, without limitation, a bacterial, yeast, insect, or mammalian cell. Examples of suitable cells include E. coli, B. subtilis, BHK, COS and CHO cells. Additionally encompassed are fusion polypeptides of the invention modified by acetylation or pegylation.
- the invention features a method of producing a fusion polypeptide of the invention, comprising culturing a host cell transfected with a vector comprising a nucleic acid molecule of the invention, under conditions suitable for expression of the protein from the host cell, and recovering the polypeptide so produced.
- the invention features therapeutic methods for the treatment of a disease or condition, comprising administering a therapeutically effective amount of the IGF fusion protein of the invention to a subject in need thereof, or a subject at risk for development of that disease or condition.
- the therapeutic method of the invention comprises administering a therapeutically effective amount of an IGF fusion protein of the invention to a subject in need thereof, wherein the muscle- related disease or condition is ameliorated or inhibited.
- the muscle-related condition or disorder treated by the fusion polypeptides of the invention may arise from a number of sources, including for example: denervation; degenerative, metabolic or inflammatory neuropathy; infantile and juvenile spinal muscular atrophies; autoimmune motor neuropathy; from chronic disease, including cachexia resulting from cancer, AIDS, fasting or rhabdomyolysis; and from muscular dystrophy syndromes such as Duchenne.
- the therapeutic method of the invention are useful to treat any condition which is results from an IGF deficiency or which may be improved by increased IGF levels, including dwarfism and heart disease, for example, improved heart tissue survival following myocardial infarction.
- the invention features pharmaceutical compositions comprising a fusion protein of the invention with a pharmaceutically acceptable carrier.
- Such pharmaceutical compositions may comprise the fusion proteins or nucleic acids which encode them, together with a pharmaceutically acceptable carrier.
- references to “a method” include one or more methods, and/or steps of the type described herein and/or which will become apparent to those persons skilled in the art upon reading this disclosure and so forth.
- the invention encompasses fusion polypeptides and nucleic acids that encode them which comprise one or more IGF variant components and a fusion component (F), which may comprise a multimerizing component, a targeting component, and/or one or more additional active or therapeutic agent(s).
- F fusion component
- Bioly active fragments or derivatives of a component of the fusion polypeptides of the invention encompass any naturally occurring molecule, or mutant or derivative thereof capable of achieving the desired effect at the target site.
- described herein are variants of IGF1 , which have improved properties of activity and stability.
- the invention envisions the use of a mutant or derivative of the IGF1 molecules described herein which are capable of binding the IGF1 receptor.
- a “biologically active" fragment of derivative of any targeting component is any portion or mutant thereof capable of binding the target cell.
- the targeting ligand is agrin
- a biologically active fragment or derivative is any portion or mutant of agrin capable of binding the MuSK receptor.
- treatment used herein to generally mean obtaining a desired pharmacologic and/or physiologic effect.
- the effect may be prophylactic in terms of completely or partially preventing a disease, condition, or symptoms thereof, and/or may be therapeutic in terms of a partial or complete cure for a disease or condition and/or adverse effect attributable to the disease or condition.
- Treatment covers any treatment of a disease or condition of a mammal, particularly a human, and includes: (a) preventing the disease or condition from occurring in a subject which may be predisposed to the disease or condition but has not yet been diagnosed as having it; (b) inhibiting the disease or condition, i.e., arresting its development; or (c) relieving the disease or condition, i.e., causing regression of the disease or condition.
- the population of subjects treated by the method of the disease includes subject suffering from the undesirable condition or disease, as well as subjects at risk for development of the condition or disease.
- a "condition or disease” generally encompasses a condition of a mammalian host, particularly a human host, which is undesirable and/or injurious to the host.
- treating a muscle-related condition with a fusion polypeptide which specifically targets skeletal muscle will encompass the treatment of a mammal, in particular, a human, who has symptoms reflective of decreased target muscle receptor activation, or who is expected to have such decreased levels in response to a disease, condition or treatment regimen.
- Treating a muscle-related condition or disease encompasses the treatment of a human subject wherein enhancing the activation of a target muscle receptor with the muscle specific fusion polypeptide of the invention results in amelioration of an undesirable symptom resulting from the muscle-related condition or disease.
- a "muscle-related condition" also includes a condition in which it is desirable to alter, either transiently, or long-term, activation of a particular target muscle receptor.
- the first component of the polypeptides of the invention is an IGF1 or IGF2 variant ("IGF variant").
- IGF variants comprise mature human IGF1 (SEQ ID NO:1) having the following modifications: (i) a deletion of 3-6 amino acids at the C-terminus, e.g., Lys65 to Ala70; (ii) a modification at the N-terminus selected from the group consisting of deletion of amino acids 1-3 and substitution of Glu3 with a different amino acid, such as a alanine, valine, histidine or arginine, e.g., Glu3Arg or Glu3Ala, and/or (iii) a modification at Arg36 and/or Arg37 selected from the group consisting of deletion of Arg36, deletion of Arg 37, substitution of Arg36 with a different amino acid, e.g., Arg36Ala, and substitution of Arg37 with a different amino acid, e.g.,
- such variants comprise the human IGF2 protein of SEQ ID NO:3 comprising (i) a modification of the C-terminus selected from the group consisting of deletion of 3 amino acids, e.g., 65-67( ⁇ 65-67), deletion of Lys65( ⁇ 65), and substitution of amino acid 65 with another amino acid; (ii) a modification of the N-terminus selected from the group consisting of deletion of amino acids 1-6 ( ⁇ 1-6) and substitution of Glu6 with a different amino acid, such as alanine, valine, histidine or arginine, e.g.
- Glu ⁇ Arg or Glu ⁇ Ala and/or (iii) a modification at Arg37 and/or Arg38 selected from the group consisting of deletion of Arg37 ( ⁇ 37), deletion of Arg 38 ( ⁇ 38), substitution of Arg37 with a different amino acid, e.g., Arg37Ala, and substitution of Arg38 with a different amino acid, e.g., Arg38Ala.
- the fusion component of the fusion polypeptides of the invention is a targeting ligand.
- a targeting ligand is a molecule, e.g., a protein or fragment thereof that specifically binds with high affinity to a target on a pre-selected cell, such as a surface protein such as a receptor that is present to a greater degree on the pre-selected cell target than on any other body tissue.
- a targeting ligand is highly specific to muscle.
- the cognate ligand agrin, as well as MuSK binding portions thereof is an example of a targeting ligand useful as a fusion component in the fusion polypeptides of the present invention.
- a targeting ligand is a group of cadherin domains from a human cadherin.
- human cadherin domains from, for example, human muscle cadherin may be used in the targeting fusion polypeptides of the invention to target muscle cells.
- the targeting ligand component of the fusion polypeptide of the invention may include a naturally occurring or engineered ligand, or a fragment thereof, capable of binding the pre-selected target cell.
- the targeting ligand component of the targeting fusion polypeptides of the invention consists of at least three, four or five muscle cadherin (M- cadherin) domains, or derivatives or fragments thereof, capable of binding specifically to target cells that express homophilic cadherins.
- M- cadherin muscle cadherin
- the fusion polypeptide of the invention comprises at least three cadherin domains from the extracellular domain of human M-cadherin (or biologically active fragments or derivatives thereof that are capable of binding homophilic M-cadherin), fused to the IGF1 variant component.
- targeting ligands also include, but are not limited to, antibodies and portions thereof that bind a pre-selected cells surface protein with high affinity.
- high affinity is meant an equilibrium dissociation constant of at least 10 "7 molar, as determined by assay methods known in the art, for example, BiaCore analysis.
- the targeting ligand component of the targeting fusion polypeptides of the invention may also comprise one or more immunoglobulin binding domains isolated from antibodies generated against a selected tissue-specific surface protein or target tissue-specific receptor.
- immunoglobulin or antibody refers to a mammalian, including human, polypeptide comprising a framework region from an immunoglobulin gene or fragments thereof that specifically binds and recognizes an antigen, which, in the case of the present invention, is a tissue-specific surface protein, a target tissue-specific receptor, or portion thereof.
- immunoglobulin binding regions should be derived from the corresponding mammalian immunoglobulins. If the targeting fusion polypeptide is intended for non-therapeutic use, such as for diagnostics and ELISAs, the immunoglobulin binding regions may be derived from either human or non-human mammals, such as mice.
- the human immunoglobulin genes or gene fragments include the kappa, lambda, alpha, gamma, delta, epsilon, and mu constant regions, as well as the myriad immunoglobulin variable region genes. Light chains are classified as either kappa or lambda.
- Heavy chains are classified as gamma, mu, alpha, delta, or epsilon, which in turn define the immunoglobulin classes, IgG, IgM, IgA, IgD, and IgE, respectively. Within each IgG class, there are different isotypes (e.g. IgG 1 , IgG 2 , etc.). Typically, the antigen-binding region of an antibody will be the most critical in determining specificity and affinity of binding.
- An exemplary immunoglobulin (antibody) structural unit of human IgG comprises a tetramer.
- Each tetramer is composed of two identical pairs of polypeptide chains, each pair having one light chain (about 25 kD) and one heavy chain (about 50-70 kD).
- the N-terminus of each chain defines a variable region of about 100-110 or more amino acids primarily responsible for antigen recognition.
- the terms "variable light chain” (V L ) and variable heavy chain (V H ) refer to these light and heavy chains respectively.
- Antibodies exist as intact immunoglobulins, or as a number of well-characterized fragments produced by digestion with various peptidases. For example, pepsin digests an antibody below the disulfide linkages in the hinge region to produce F(ab)' 2 , a dimer of Fab which itself is a light chain joined to VH-CH by a disulfide bond.
- the F(ab)' 2 may be reduced under mild conditions to break the disulfide linkage in the hinge region, thereby converting the F(ab)' 2 dimer into an Fab' monomer.
- the Fab' monomer is essentially Fab with part of the hinge region.
- immunoglobulin or antibody also includes antibody fragments either produced by the modification of whole antibodies, or those synthesized de novo using recombinant DNA methodologies (e.g., single chain Fv)(ScFv)) or those identified using phase display libraries (see, for example, McCafferty et al. (1990) Nature 348:552-554).
- the fusion polypeptides of the invention include the variable regions of the heavy (VH) or the light (V L ) chains of immunoglobulins, as well as tissue-specific surface protein and target receptor-binding portions thereof. Methods for producing such variable regions are described in Reiter, et al. (1999) J. MoI. Biol. 290:685-698.
- Random combinations of the heavy and light chain gene products generate a large pool of antibodies with different antigenic specificity.
- Techniques for the production of single chain antibodies or recombinant antibodies can be adapted to produce antibodies used in the fusion polypeptides and methods of the instant invention.
- transgenic mice, or other organisms such as other mammals may be used to express human or humanized antibodies.
- phage display technology can be used to identify antibodies, antibody fragments, such as variable domains, and heteromeric Fab fragments that specifically bind to selected antigens.
- Screening and selection of preferred immunoglobulins can be conducted by a variety of methods known to the art.
- Initial screening for the presence of monoclonal antibodies specific to a tissue-specific or target receptor may be conducted through the use of ELISA-based methods or phage display, for example.
- a secondary screen is preferably conducted to identify and select a desired monoclonal antibody for use in construction of the tissue-specific fusion polypeptides of the invention. Secondary screening may be conducted with any suitable method known to the art.
- One preferred method termed "Biosensor Modification-Assisted Profiling" (“BiaMAP”) (US patent publication 2004/101920), allows rapid identification of hybridoma clones producing monoclonal antibodies with desired characteristics. More specifically, monoclonal antibodies are sorted into distinct epitope-related groups based on evaluation of antibody: antigen interactions.
- the fusion component (F) of the polypeptides of the invention comprises a second active or therapeutic agent or mutant or derivative thereof, i.e. a molecule capable of having a desired effect when delivered to the pre-selected target site, e.g., cell or tissue.
- Active or therapeutic agents include, but are not limited to, small molecules, hormones, growth factors, therapeutic biologies, activating antibodies and portions thereof, and blocking antibodies and portions thereof, that are capable of having a desirable effect upon delivery to a target cell or tissue.
- the fusion polypeptide comprises a second active or therapeutic agent that is active on muscle cells.
- agents include, but are not limited to, insulin, IL-15, myotrophin, urocortin, urocortin II, human myostatin propeptide, a natural or mutant IGF1 or IGF2, hGH, proliferin, follistatin, FSTL1 , and FLRG, or mutants, derivative, or fragments thereof having biologically activity.
- the active or therapeutic agent may comprise a blocking antibody or biologically active derivative thereof, which blocks, for example, myostatin, activin receptor, BMP receptor 1 , TNF receptor, IL-1 receptor, ALK3 receptor and ALK4 receptor.
- the active or therapeutic agent may comprise an activating antibody that activates, for example, the IFG1 receptor, B2adrenergic receptor or the IL-15 receptor complex.
- the fusion component (F) of the fusion polypeptides of the invention comprises a multimerizing component.
- a multimerizing component includes any natural or synthetic sequence capable of interacting with another multimerizing component to form a higher order structure, e.g., a dimer, a trimer, etc.
- the multimerizing component may be selected from the group consisting of an amino acid sequence between 1 to about 500 amino acids in length, a leucine zipper, a helix loop motif, and a coil-coil motif.
- the multimerizing component comprises an amino acid sequence between 1 to about 500 amino acids in length
- the sequence may contain one or more cysteine residues capable of forming a disulfide bond with a corresponding cysteine residue on another fusion polypeptide comprising a multimerizing component with one or more cysteine residues.
- the multimerizing component comprises an immunoglobulin-derived domain from, for example, human IgG, IgM or IgA, or comparable immunoglobulin domains from other animals, including, but not limited to, mice.
- the immunoglobulin-derived domain may be selected from the group consisting of the constant region of IgG, the Fc domain of IgG, an Fc-protein, and the heavy chain of IgG.
- the Fc domain of IgG may be selected from the isotypes IgGI , lgG2, lgG3, and lgG4, as well as any allotype within each isotype group.
- the components of the targeting fusion polypeptides of the invention may be connected directly to each other or be connected via spacers.
- spacer or “linker” means one or more molecules, e.g., nucleic acids or amino acids, or non-peptide moieties, such as polyethylene glycol, which may be inserted between one or more component domains.
- spacer sequences may be used to provide a restriction site between components for ease of manipulation.
- a spacer may also be provided to enhance expression of the fusion polypeptide from a host cell, to decrease steric hindrance such that the component may assume its optimal tertiary or quaternary structure and/or interact appropriately with its target molecule.
- a spacer sequence may include one or more amino acids naturally connected to a receptor component, or may be an added sequence used to enhance expression of the fusion protein, provide specifically desired sites of interest, allow component domains to form optimal tertiary structures and/or to enhance the interaction of a component with its target molecule.
- the spacer comprises one or more peptide sequences between one or more components which is (are) between 1-100 amino acids, preferably 1-25.
- the spacer is a three amino acid sequence; more specifically, the three amino acid sequence of GIy Pro GIy.
- Individual components of the fusion polypeptides of the invention may be produced from nucleic acids molecules using molecular biological methods known to the art.
- the nucleic acid of SEQ ID NO:2 or SEQ ID NO:4 with the appropriate deletions or mutations may be used to prepare the IGF1 or IGF2 variants described herein.
- Such nucleic acid molecules are inserted into a vector that is able to express the fusion polypeptides when introduced into an appropriate host cell.
- Appropriate host cells include, but are not limited to, bacterial, yeast, insect, and mammalian cells.
- any of the methods known to one skilled in the art for the insertion of DNA fragments into a vector may be used to construct expression vectors encoding the fusion polypeptides of the invention under control of transcriptional/translational control signals. These methods may include in vitro recombinant DNA and synthetic techniques and in vivo recombinations (See Sambrook et al. Molecular Cloning. A Laboratory Manual, Cold Spring Harbor Laboratory; Current Protocols in Molecular Biology, Eds. Ausubel, et al., Greene Publ. Assoc, Wiley-lnterscience, NY).
- Expression of the nucleic acid molecules of the invention may be regulated by a second nucleic acid sequence so that the molecule is expressed in a host transformed with the recombinant DNA molecule.
- expression of the nucleic acid molecules of the invention may be controlled by any promoter/enhancer element known in the art. Promoters which may be used to control expression of the fusion polypeptide molecules include, but are not limited to, the long terminal repeat as described in Squinto et al.
- the nucleic acid constructs of the invention are inserted into an expression vector or viral vector by methods known to the art, wherein the nucleic acid molecule is operatively linked to an expression control sequence.
- a host-vector system for the production of a tissue-specific fusion polypeptide of the invention which comprises the expression vector of the invention, which has been introduced into a host cell suitable for expression of the fusion polypeptide.
- the suitable host cell may be a bacterial cell such as E. coli, a yeast cell, such as Pichia pastoris, an insect cell, such as Spodoptera frugiperda, or a mammalian cell, such as a COS, CHO, 293, BHK or NSO cell.
- the invention further encompasses methods for producing the fusion polypeptides of the invention by growing cells transformed with an expression vector under conditions permitting production of the tissue-specific fusion polypeptides and recovery of the fusion polypeptides so produced.
- Cells may also be transduced with a recombinant virus comprising the nucleic acid construct of the invention.
- the fusion polypeptides may be purified by any technique, which allows for the subsequent formation of a stable polypeptide.
- the fusion polypeptides may be recovered from cells either as soluble polypeptides or as inclusion bodies, from which they may be extracted quantitatively by 8M guanidinium hydrochloride and dialysis.
- conventional ion exchange chromatography, hydrophobic interaction chromatography, reverse phase chromatography or gel filtration may be used.
- the fusion polypeptides may also be recovered from conditioned media following secretion from eukaryotic or prokaryotic cells. Therapeutic Methods
- the invention herein further provides for the development of IGF fusion polypeptides described herein as a therapeutic for the treatment of patients suffering from disorders which may be ameliorated by providing IGF1 or IGF2, for example, a condition caused or worsened by an IGF deficiency.
- IGF1 or IGF2 for example, a condition caused or worsened by an IGF deficiency.
- a decrease in muscle mass, or atrophy is associated with various physiological and pathological states.
- muscle atrophy can result from denervation due to nerve trauma; degenerative, metabolic or inflammatory neuropathy, e.g. Guillian-Barre syndrome; peripheral neuropathy; or nerve damage caused by environmental toxins or drugs.
- Muscle atrophy may also result from denervation due to a motor neuropathy including, for example, adult motor neuron disease, such as Amyotrophic Lateral Sclerosis (ALS or Lou Gehrig's disease); infantile and juvenile spinal muscular atrophies; and autoimmune motor neuropathy with multifocal conductor block. Muscle atrophy may also result from chronic disease resulting from, for example, paralysis due to stroke or spinal cord injury; skeletal immobilization due to trauma, such as, for example, fracture, ligament or tendon injury, sprain or dislocation; or prolonged bed rest.
- a motor neuropathy including, for example, adult motor neuron disease, such as Amyotrophic Lateral Sclerosis (ALS or Lou Gehrig's disease); infantile and juvenile spinal muscular atrophies; and autoimmune motor neuropathy with multifocal conductor block. Muscle atrophy may also result from chronic disease resulting from, for example, paralysis due to stroke or spinal cord injury; skeletal immobilization due to trauma, such as, for example, fracture, ligament or tendon injury,
- Metabolic stress or nutritional insufficiency which may also result in muscle atrophy, include the cachexia of cancer and other chronic illnesses including AIDS, fasting or rhabdomyolysis, and endocrine disorders such as disorders of the thyroid gland and diabetes. Muscle atrophy may also be due to muscular dystrophy syndromes such as Duchenne, Becker, myotonic, fascioscapulohumeral, Emery-Dreifuss, oculopharyngeal, scapulohumeral, limb girdle, and congenital types, as well as the dystrophy known as Hereditary Distal Myopathy.
- muscular dystrophy syndromes such as Duchenne, Becker, myotonic, fascioscapulohumeral, Emery-Dreifuss, oculopharyngeal, scapulohumeral, limb girdle, and congenital types, as well as the dystrophy known as Hereditary Distal Myopathy.
- Muscle atrophy may also be due to a congenital myopathy, such as benign congenital hypotonia, central core disease, nemalene myopathy, and myotubular (centronuclear) myopathy. Muscle atrophy also occurs during the aging process. Muscle atrophy in various pathological states is associated with enhanced proteolysis and decreased production of muscle proteins.
- the IGF1 and IGF2 fusion polypeptides of the invention are also useful in diseases associated with an IGF deficiency, such as dwarfism. Still further, IGFs have been shown to improve the survival of cardiac muscle cells after an event such as a myocardial infarction, thus the fusion polypeptides of the invention are useful in a subject who has experienced such an event.
- IGF fusion polypeptides of the invention to evade the large number of IGF-binding proteins present in a mammal makes them therapeutically useful for efficiently treating conditions which may benefit from an increased IGF level, such as recovery from atrophy-promoting conditions, situations in which skeletal muscle mass was decreasing, or situations in which muscle hypertrophy is desirable, such as during recovery from immobilization, aging, cancer, etc.
- IGF fusion molecules of the invention wherein the fusion component is a multimerizing component such as Fc or another active component could further be used in settings other than muscle.
- IGF1 and IGF2 have been shown to be bone growth factors, and therefore an IGFI-Fc or IGF2-Fc or an IGF1 or IGF2 fusion to growth hormone could be useful in the treatment of osteoporosis or other bone loss or weakness, including age related weakness, frailty or sarcopenia.
- the non-targeted molecules may also be useful in settings of more general body mass wasting - such as cachexia. Cachexia is a condition causing body mass loss, including, but not limited to, muscle mass.
- Settings of cachexia include cancer-induced cachexia, AIDS-induced cachexia, sepsis-induced cachexia, renal failure-induced cachexia, and congestive heart failure. Also, there is growth retardation in many settings, including thalassaemia, which causes short stature. Short stature in general would be a setting for an IGF1 or IGF2 fusion protein that is not targeted directly to muscle - such as the IGFI-Fc or IGF2-Fc or the IGF1-GH or IGF2-GH embodiments. An additional use for IGF1 or IGF2 is to complement or substitute for insulin. In settings of insulin- insensitive diabetes, IGF1 or IGF2 fusion proteins of the invention may be used.
- IGF1 and IGF2 fusions described herein include use in the weaning of individuals from ventilators and for the treatment of conditions such as anemia wherein the proliferation of blood cells is desired.
- Methods known in the art for the therapeutic delivery of agents such as proteins or nucleic acids can be used for the therapeutic delivery of an IGF fusion polypeptide or a nucleic acid encoding a IGF fusion polypeptide of the invention, e.g., cellular transfection, gene therapy, direct administration with a delivery vehicle or pharmaceutically acceptable carrier, indirect delivery by providing recombinant cells comprising a nucleic acid encoding an IGF fusion polypeptide of the invention.
- fusion polypeptide of the invention e.g., encapsulation in liposomes, microparticles, microcapsules, recombinant cells capable of expressing the compound, receptor-mediated endocytosis, construction of a nucleic acid as part of a retroviral or other vector, etc.
- Methods of introduction can be enteral or parenteral and include but are not limited to intradermal, intramuscular, intraperitoneal, intravenous, subcutaneous, pulmonary, intranasal, intraocular, epidural, and oral routes.
- the compounds may be administered by any convenient route, for example by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral mucosa, rectal and intestinal mucosa, etc.) and may be administered together with other biologically active agents. Administration can be systemic or local.
- Pulmonary administration can also be employed, e.g., by use of an inhaler or nebulizer, and formulation with an aerosolizing agent.
- compositions of the invention may be desirable to administer locally to the area in need of treatment; this may be achieved, for example, and not by way of limitation, by local infusion during surgery, topical application, e.g., by injection, by means of a catheter, or by means of an implant, said implant being of a porous, non- porous, or gelatinous material, including membranes, such as sialastic membranes, fibers, or commercial skin substitutes.
- the active agent can be delivered in a vesicle, in particular a liposome (see Langer (1990) Science 249:1527-1533).
- the active agent can be delivered in a controlled release system.
- a pump may be used (see Langer (1990) supra).
- polymeric materials can be used (see Howard et al. (1989) J. Neurosurg. 71 :105 ).
- the active agent of the invention is a nucleic acid encoding a protein
- the nucleic acid can be administered in vivo to promote expression of its encoded protein, by constructing it as part of an appropriate nucleic acid expression vector and administering it so that it becomes intracellular, e.g., by use of a retroviral vector (see, for example, U.S. Patent No.
- a nucleic acid can be introduced intracellular ⁇ and incorporated within host cell DNA for expression, by homologous recombination.
- the present invention encompasses the use of nucleic acids encoding the fusion polypeptides of the invention for transfection of cells in vitro and in vivo.
- nucleic acids can be inserted into any of a number of well-known vectors for transfection of target cells and organisms.
- the nucleic acids are transfected into cells ex vivo and in vivo, through the interaction of the vector and the target cell.
- the compositions are administered (e.g., by injection into a muscle) to a subject in an amount sufficient to elicit a therapeutic response.
- the invention provides a method of treating a target site, i.e., a target cell or tissue, in a human or other animal comprising transfecting a cell with a nucleic acid encoding a tissue-specific fusion polypeptide of the invention, wherein the nucleic acid comprises an inducible promoter operably linked to the nucleic acid encoding the targeting fusion polypeptide.
- the fusion polypeptides of the present invention may be administered in combination with one or more additional compounds or therapies.
- multiple fusion polypeptides can be co-administered in conjunction with one or more therapeutic compounds.
- the combination therapy may encompass simultaneous or alternating administration.
- the combination may encompass acute or chronic administration.
- the present invention also provides pharmaceutical compositions comprising a fusion protein of the invention and a pharmaceutically acceptable carrier.
- pharmaceutically acceptable means approved by a regulatory agency of the Federal or a state government or listed in the U.S. Pharmacopeia or other generally recognized pharmacopeia for use in animals, and more particularly in humans.
- carrier refers to a diluent, adjuvant, excipient, or vehicle with which the therapeutic is administered.
- Such pharmaceutical carriers can be sterile liquids, such as water and oils, including those of petroleum, animal, vegetable or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil and the like.
- Suitable pharmaceutical excipients include starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene, glycol, water, ethanol and the like.
- the composition if desired, can also contain minor amounts of wetting or emulsifying agents, or pH buffering agents. These compositions can take the form of solutions, suspensions, emulsion, tablets, pills, capsules, powders, sustained-release formulations and the like.
- the composition can be formulated as a suppository, with traditional binders and carriers such as triglycerides.
- Oral formulation can include standard carriers such as pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, cellulose, magnesium carbonate, etc. Examples of suitable pharmaceutical carriers are described in "Remington's Pharmaceutical Sciences” by E. W. Martin.
- the composition is formulated in accordance with routine procedures as a pharmaceutical composition adapted for intravenous administration to human beings. Where necessary, the composition may also include a solubilizing agent and a local anesthetic such as lidocaine to ease pain at the site of the injection.
- the composition is to be administered by infusion, it can be dispensed with an infusion bottle containing sterile pharmaceutical grade water or saline. Where the composition is administered by injection, an ampoule of sterile water for injection or saline can be provided so that the ingredients may be mixed prior to administration.
- the active agents of the invention can be formulated as neutral or salt forms.
- Pharmaceutically acceptable salts include those formed with free amino groups such as those derived from hydrochloric, phosphoric, acetic, oxalic, tartaric acids, etc., and those formed with free carboxyl groups such as those derived from sodium, potassium, ammonium, calcium, ferric hydroxides, isopropylamine, triethylamine, 2-ethylamino ethanol, histidine, procaine, etc.
- the amount of the fusion polypeptide of the invention which will be effective in the treatment of a condition or disease can be determined by standard clinical techniques based on the present description.
- in vitro assays may optionally be employed to help identify optimal dosage ranges.
- the precise dose to be employed in the formulation will also depend on the route of administration, and the seriousness of the condition, and should be decided according to the judgment of the practitioner and each subject's circumstances.
- suitable dosage ranges for intravenous administration are generally about 20-5000 micrograms of active compound per kilogram body weight.
- Suitable dosage ranges for intranasal administration are generally about 0.01 pg/kg body weight to 1 mg/kg body weight.
- Effective doses may be extrapolated from dose-response curves derived from in vitro or animal model test systems.
- the invention also provides a pharmaceutical pack or kit comprising one or more containers filled with at least one fusion polypeptide or nucleic acid encoding a fusion polypeptide of the invention.
- kits of the invention may be used in any applicable method, including, for example, diagnostically.
- Optionally associated with such container(s) can be a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products, which notice reflects (a) approval by the agency of manufacture, use or sale for human administration, (b) directions for use, or both.
- the invention includes transgenic non-human animals expressing an IGF fusion polypeptide of the invention.
- a transgenic animal can be produced by introducing nucleic acid into the male pronuclei of a fertilized oocyte, e.g., by microinjection, retroviral infection, and allowing the oocyte to develop in a pseudopregnant female foster animal. Any of the regulatory or other sequences useful in expression vectors can form part of the transgenic sequence.
- a tissue-specific regulatory sequence(s) can be operably linked to the transgene to direct expression of the transgene to particular cells.
- a transgenic non-human animal expressing a tissue-specific fusion polypeptide of the invention is useful in a variety of applications, including as a means of producing such fusion proteins.. Further, the transgene may be placed under the control of an inducible promoter such that expression of the tissue-specific fusion polypeptide may be controlled by, for example, administration of a small molecule.
- a fusion polypeptide was constructed utilizing human IGF1 containing human IGF1 ( ⁇ 1-3, delR37) fused to human Fc.
- the polypeptide was purified and injected into mice. Blood samples were taken every 24 hours for seven days. Western analysis was conducted using an antibody specific to the human Fc. After three days, a lower-migrating band was noticed, indicating that the IGFI-Fc was being proteolytically cleaved in serum. More serum was taken, and this lower- migrating species was purified and sequenced. It was established that the IGFI-Fc construct was cleaved at the lysine 68 or the lysine 65 in the IGF1 variant.
- constructs are prepared in which the terminal three to six amino acids are removed, or the lysine at position 65 or 68 is mutated to another amino acid such as alanine or glycine.
- Such variants are utilized in preparation of fusion polypeptides of the invention comprising fusion components such as multimerizing components, targeting ligands, and other active compounds, and are found to have greater stability and half-life than comparable constructs with the lysine at position 65 or 68 of the IGF1 variant component.
- Fusion polypeptide constructs were made using IGF1variant-Fc, or Fc-IGFI variant, utilizing the variant IGF1 ( ⁇ 1-3, delR37) and human IgG derived Fc.
- the activity of IGF1 was measured by its ability to phosphorylate the IGF1 receptor and Akt kinase. Such phosphorylation was determined by a Western blot, using phospho-specific antibodies to the various molecules, or by immune-precipitating the receptors (such as IGFR), and Westerning with an antibody specific to anti-phospho-tyrosine.
- IGF1 ( ⁇ 1-3, delR37)-Fc was administered to SCID mice intra-peritoneally or subcutaneously via daily injections or via injections every other day. 4.5 mgs/kg of fusion protein were used for the injections. Control mice got no IGFI-Fc protein.
- a third group of mice received both 15mg/kg dexamethasone subcutaneously per day. This dosage is sufficient to result in 15% loss of muscle mass after twelve days.
- mice in this fourth group experienced either no atrophy or statistically significant reductions in atrophy (5% atrophy in tibialis anterior (TA) muscle for mice which received both dexamethasone and IGF1 ( ⁇ 1-3, delR37)-vs 15 % atrophy of TA for those mice which received only dexamethasone).
- Fusion polypeptides were constructed utilizing IGF1( ⁇ 1-3, delR37) with hGH as the fusion component.
- IGF1 human growth hormone
- the activity of human growth hormone (hGH) was measured by its ability to phosphorylate Stat5.
- constructs having the configuration IGF1variant-hGH caused phosphorylation of both 1GF1 receptors and Stat ⁇ , while constructs with the configuration hGH-IGF1 variant had little or no activity.
- Phosphorylation assays indicated that fusion proteins having the configuration IGF1 variant-hGH, which includes both hGH and the hIGF1 variant described above, is capable of simultaneously activating the IGF1 Receptor, Akt, and Stat ⁇ .
- Such phosphorylation was determined by a Western blot, using phospho-specific antibodies to the various molecules, or by immune-precipitating the receptors (such as IGFR), and Westerning with an antibody specific to anti-phospho-tyrosine.
- all of the above fusion polypeptides were made using human IGF1 mutants which had the first three amino acids deleted ( ⁇ 1-3) and either elimination or substitution of the arginines at positions 36 and/or 37.
- Such mutant IGF1 molecules demonstrated both resistance to cleavage as well as reduced binding by IGF-1 binding proteins (specifically IGF1 binding protein 5) without affecting signaling ability on C2C12 myotubes.
- Fusion proteins comprising the IGF1 variants described above as well as deletion of amino acids 65-70 or 68-70 or mutation of the lysine at position 65 and 68 are constructed and tested for their ability to simultaneously activate the IGF1 Receptor, Akt, and Stat5, as determined by a Western blot, using phospho-specific antibodies to the various molecules, or by immune- precipitating the receptors (such as IGFR), and Westerning with an antibody specific to anti- phospho-tyrosine.
- C2C12 myotubes are contacted with the fusions and hypertrophy measured as compared to hypertrophy caused by either IGF1 alone or hGH alone.
- activity may be measured by phosphorylation of the target receptor, such as MuSK (Glass et al. (1996) 85:513- 523; Beguinot et al. (1988) Biochemistry. 27 (9): 3222-8).
- MuSK Glass et al. (1996) 85:513- 523; Beguinot et al. (1988) Biochemistry. 27 (9): 3222-8).
- Example 6 Pharmacokinetic Analysis of 2D-IGFI-Fc and 3D-IGFI -Fc.
- muscles tibialis anterior and the gastrocnemius complex
- Injection of 2D-IGFI-Fc caused a 23.07 ⁇ 2.14% (mean ⁇ SEM) increase in tibialis anterior mass and a 17.00 ⁇ 2.07% increase in gastrocnemius mass compared to control muscles.
- Injection of 3D-IGFI-Fc caused a 9.45 ⁇ 3.72% increase in tibialis anterior mass and a 9.31 ⁇ 2.15% increase in gastrocnemius mass compared to control muscles.
- Injection of 2D- IGFI-Fc caused a 13.35% ⁇ 2.26 (mean ⁇ SEM) increase in tibialis anterior mass and a 9.39% ⁇ 3.68% increase in gastrocnemius mass compared to control muscles.
- Injection of IGF-I gave 2.24% ⁇ 2.27 increase in tibialis anterior mass and a 0.81% ⁇ 1.51 increase in gastrocnemius mass compared to control muscles.
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JP2007550507A JP4988599B2 (en) | 2005-01-07 | 2006-01-06 | IGF-1 fusion polypeptide and therapeutic use thereof |
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AU2006203882A AU2006203882B2 (en) | 2005-01-07 | 2006-01-06 | IGF-1 fusion polypeptides and therapeutic uses thereof |
AT06717668T ATE517120T1 (en) | 2005-01-07 | 2006-01-06 | IGF-1 FUSION POLYPEPTIDES AND THEIR THERAPEUTIC USE |
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ES2541810T3 (en) | 2015-07-24 |
US7837999B2 (en) | 2010-11-23 |
PL2241575T3 (en) | 2015-12-31 |
ATE517120T1 (en) | 2011-08-15 |
US20090069235A1 (en) | 2009-03-12 |
JP4988599B2 (en) | 2012-08-01 |
DK2241575T3 (en) | 2015-08-24 |
EP2241575B1 (en) | 2015-06-24 |
PT2241575E (en) | 2015-09-16 |
WO2006074390A3 (en) | 2007-01-11 |
HUE027645T2 (en) | 2016-10-28 |
US20110020342A1 (en) | 2011-01-27 |
CA2594023C (en) | 2015-07-14 |
US7396918B2 (en) | 2008-07-08 |
AU2006203882B2 (en) | 2011-05-12 |
AU2006203882A1 (en) | 2006-07-13 |
EP2241575A1 (en) | 2010-10-20 |
JP2008526233A (en) | 2008-07-24 |
US20060166328A1 (en) | 2006-07-27 |
EP1833847B1 (en) | 2011-07-20 |
HK1144684A1 (en) | 2011-03-04 |
CA2594023A1 (en) | 2006-07-13 |
US20120195896A1 (en) | 2012-08-02 |
EP1833847A2 (en) | 2007-09-19 |
US8445434B2 (en) | 2013-05-21 |
US8158581B2 (en) | 2012-04-17 |
PL1833847T3 (en) | 2011-12-30 |
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