Classifications

• • 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• • 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
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2317/00—Immunoglobulins specific features
  • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
  • C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered

Definitions

• This invention is in the field of medicine. More particularly, this invention is directed to a composition comprising an anti-A ⁇ antibody either free of A ⁇ peptide or with acceptably low amounts thereof.
• a principal component of amyloid plaques is the 39 to 43 amino acid A ⁇ peptide.
• This peptide is proteolytically derived from a type I integral membrane protein, the amyloid precursor protein (APP).
• APP amyloid precursor protein
• the predominant forms secreted in cell culture media are A ⁇ peptide (1-39/40 or X-39/40), whereas the longer forms, A ⁇ peptide (1-42/43 or X-42/43), which are less soluble and more prone to aggregate, constitute the nucleating seeds for amyloid deposition.
• Amyloid deposits comprised of A ⁇ peptide are associated with conditions and diseases such as Alzheimer's disease, Down's syndrome, cerebral amyloid angiopathy, vascular dementias, mild cognitive impairment, and the like.
• Various therapeutic treatments for conditions and diseases related to abnormal deposits containing the A ⁇ peptide have focused on preventing A ⁇ peptide production and/or its aggregation into plaques as well as on reducing or eliminating amyloid plaques.
• Another treatment approach involves inducing an immunogenic response to A ⁇ peptide through administration of the peptide by, for example, active immunization (WO 99/27944).
• the present invention provides a composition that is suitable for administration to a human subject comprising an anti-A ⁇ antibody that is free of A ⁇ peptide or that has acceptably low levels thereof. Also, the invention provides a composition that is suitable for administration to a human subject comprising an anti-A ⁇ antibody that is free of non-human A ⁇ peptide or that has acceptably low levels thereof. The invention further provides a composition that is suitable for administration to a human subject comprising an anti-A ⁇ antibody having an undetectable concentration of A ⁇ peptide. The invention also provides a process for preparing an anti-A ⁇ antibody that is free of A ⁇ peptide or that has acceptably low levels thereof. One embodiment of the invention provides that the antibody is expressed in NSO cells.
• the antibody is expressed in cells in which A ⁇ production is eliminated through deletion of a specific gene, such as that encoding APP, ⁇ -secretase, or one of the ⁇ -secretase genes, or one of the or through increased expression of ⁇ -secretase.
• a further embodiment provides that the antibody is produced in a cell culture that contains a ⁇ - or ⁇ -secretase inhibitor.
• the antibody is purified of A ⁇ peptide by using acidification and size exclusion chromatography.
• the invention provides for a method of treating human patients with conditions and diseases such as Alzheimer's disease, Down's syndrome, cerebral amyloid angiopathy, vascular dementias, mild cognitive impairment, and the like using a composition of the present invention.
• antibody is meant a whole antibody, including without limitation a chimeric, humanized, human, recombinant, transgenic, grafted and single chain antibody, and the like, or any fusion proteins, conjugates, fragments, or derivatives thereof that contain one or more domains that selectively bind A ⁇ peptide.
• Antibody thereby includes a whole immunoglobulin molecule, a monoclonal antibody, a chimeric antibody, a humanized antibody, a human antibody, or an immunologically effective fragment of any of these.
• an antibody fragment means an Fv, a disulfide linked Fv, scFv, Fab, Fab', or F(ab') fragment, which are well known in the art.
• the expression "anti-A ⁇ antibody” means an antibody that recognizes or binds A ⁇ peptide.
• the term "humanized antibody” means an antibody that is composed partially or fully of amino acid sequences derived from a human antibody germline or a rearranged sequence and made by altering the sequence of an antibody having non-human complementarity determining regions (CDR).
• CDR complementarity determining regions
• the framework regions of the variable regions are substituted by corresponding human framework regions leaving the non- human CDR substantially intact.
• the human framework regions include genomic framework regions, and also encompasses those containing one or more amino acid substitutions.
• substitutions include mutations in which an amino acid at a particular position in the human framework is replaced with the amino acid from the corresponding position of the natural framework for the non-human CDR.
• An antibody in the context of humanized antibody is not limited to a full-length antibody and can include fragments and single chain forms.
• ⁇ -secretase refers to the enzyme involved in processing APP which cleaves APP to generate the amino terminus of A ⁇ peptide.
• ⁇ - secretase refers to the enzyme complex involved in APP processing which cleaves APP subsequent to ⁇ -secretase to generate the carboxyl terminus of A ⁇ .
• ⁇ - secretase refers to the enzyme involved in APP processing which cleaves APP within the A ⁇ sequence (between A ⁇ peptide residues 16 and 17) in a pathway for soluble APP such that A ⁇ peptide is not produced.
• ⁇ - or ⁇ -secretase inliibitors molecules which inhibit (block or reduce) ⁇ - or ⁇ -secretase enzymatic activity
• acceptably low levels of A ⁇ peptide is meant a level of contaminating A ⁇ peptide in an anti-A ⁇ antibody preparation that would be deemed safe and thereby acceptable or suitable for administration to a human subject, particularly in a pharmaceutical composition.
• acceptably low levels of A ⁇ peptide would be those which would not cause an immunogenic response and/or an increased immunogenic response in a patient administered anti-A ⁇ antibody.
• Acceptably low levels would be determined by one of skill in the art following practices that are commonly used and accepted in the development of pharmaceutical compositions and formulations with respect to safety.
• an undetectable concentration of A ⁇ peptide is meant a concentration of A ⁇ peptide that would fall below the detection limits of methods commonly used to measure the concentration of A ⁇ peptide in a preparation of anti-A ⁇ antibody. Such methods include, but are not limited to, ELISA, acid-urea gel/western blot analysis (as described in Examples 1-3), mass spectrometric methods, analytical chromatographic methods, or other highly sensitive analytical methods.
• ELISA acid-urea gel/western blot analysis
• mass spectrometric methods mass spectrometric methods
• analytical chromatographic methods or other highly sensitive analytical methods.
• the acid gel/western analysis as described in Examples 1-3 has a maximum sensitivity of ⁇ 1 pg A ⁇ / ⁇ g IgG
• the ELISA used in Example 3 has a limit of detection of 0.02 ng/mL. Concentrations of A ⁇ falling below these limits for these respective methods would be undetectable.
• compositions of the present invention may be made by any of several methods known in the art. The following methods are intended to illustrate but not to limit the invention.
• recombinant antibody production is accomplished using processes that can be grouped into three major stages: cell line generation, cell culture, and purification.
• an anti-A ⁇ antibody of the present invention is generally prepared by a process that includes expressing the antibody in a cell line and purifying the antibody. Changes made at any of these stages may impact expression or characteristics of the antibody generated.
• a number of variables can affect antibody expression at the cell line generation stage, including vector constructs and leader sequences contained therein used to transform the cell line to enable expression of the antibody, choice of cell type, selection of transfected cells, gene amplification and cell line screening.
• Antibody expression from the selected cell line relies upon the use of medium for cell culture. Media modifications such as changes to temperature, nutrients, and dissolved oxygen can impact expression and the product quality. Following antibody expression in cell culture, purification techniques such as various chromatographic techniques, filtration, and buffer exchange can alter the properties of the desired product, as well as purity and the nature of contaminants. In view of these general recombinant antibody production stages, the present invention can be achieved by using particular techniques or making specific modifications at each of these stages. Processes for making compositions of the present invention involve particular sources of the cell line as well as modifications to the cell line. As previously mentioned, the cell line affects antibody expression. Processes for making compositions of the present invention include use of mammalian cell lines for expressing anti-A ⁇ antibody.
• the mammalian cell line is a hamster, human, or mouse cell line. More preferably, the mammalian cell line is CHO, HEK 293, PER.C6, or NSO. Most preferably, the mammalian cell line is CHO or NSO. Use of NSO cells to recombinantly produce anti-A ⁇ antibody is preferable toward generating anti-A ⁇ antibody having an undetectable concentration of A ⁇ peptide (see Example 3). Mammalian cell lines that lack APP or one of the secretases ( ⁇ - or ⁇ -secretase) can be used for expressing the recombinant antibodies.
• a cell line that lacks or has reduced levels of APP, ⁇ - or ⁇ -secretase can be achieved through various cell line manipulations or modifications.
• Cell lines in which gene(s) encoding APP, ⁇ - or ⁇ -secretase are knocked out can be generated by methods well known in the art.
• modifications to the cell line can produce this effect of lacking a gene.
• An example of a useful cell line modification involves significantly reducing the amount of A ⁇ peptide expressed by degrading the RNA transcript for the undesirable protein (e.g. APP or ⁇ - or ⁇ -secretase) through a process known as RNA interference.
• cells can be stably or transiently transfected, or infected, with a DNA sequence to provide plasmid or viral mediated expression of small hairpin RNA structures which specifically bind to the transcript of interest to initiate cleavage and degradation of that transcript according to methods known in the art (Banan and Puri, Curr. Pharm. Biotechnol, 5:441- 50 (2004); Nesterova and Cho-Chung, Curr. Drug Targets, 5:683-9 (2004); Medema, Biochem J, 380:593-603, (2004)).
• compositions of the present invention also involve modifications to the cell culture. These methods preferably include incorporating ⁇ - or ⁇ - secretase inhibitors in the cell culture to produce anti-A ⁇ antibody with acceptably low levels of A ⁇ peptide present.
• Various ⁇ - and ⁇ -secretase inhibitors are known (e.g.
• compositions of the present invention increase soluble APP production in the cell culture, thereby reducing the amount of A ⁇ peptide produced.
• Soluble APP production may be increased through increased ⁇ -secretase activity in the cell line.
• a cell line with increased ⁇ -secretase activity can be generated by methods known in the art.
• compositions of the present invention also involve various purification techniques. These techniques include Protein A capture of antibody from cell culture. Subsequent purification may include use of agents to dissociate the anti-A ⁇ antibody from the A ⁇ peptide followed by separation of the antibody from antigen based on cliromatographic differences between these two entities. Preferred dissociative agents include acid, urea, thiocyanate, and detergent.
• compositions of the present invention are purified by steps that include Protein A capture, neutralization, dilution, acidification of the antibody, size exclusion chromatography, and neutralization (see Example 2).
• compositions of the present invention may be used to treat human patients with conditions and diseases such as Alzheimer's disease, Down's syndrome, cerebral amyloid angiopathy, vascular dementias, mild cognitive impairment, and the like.
• a ⁇ peptide may raise potential immunogenicity risks for the patient, with even greater potential health concerns if the A ⁇ peptide is non-human. As such, prevention, removal or reduction of A ⁇ peptide is key.
• the compositions of the present invention are suitable for administration to a human subject in a pharmaceutical composition that includes an anti-A ⁇ antibody and a pharmaceutically acceptable excipient.
• excipients examples include buffers, surfactants, preservatives, solubilizing agents, isotonicity agents, stabilizing agents and the like designed to be appropriate for the selected mode of administration.
• Example 1 Expression of anti-A ⁇ peptide in cell culture containing a ⁇ -secretase inhibitor.
• a ⁇ -secretase inhibitor (WO 98/28268), is added to the HEK 293 cell culture in which an anti- A ⁇ antibody is being expressed to reduce the amount of A ⁇ peptide naturally expressed by cells.
• the following protocol describes a technique for formic acid denaturation of samples and subsequent electrophoresis through an acid-urea polyacrylamide matrix:
• Apparatus setup 1 Clean and assemble acrylamide gel plates for casting. For example, Hoeffer plates into a casting stand (16 cm x 14 cm plates with 1.5 mm spacers). Clean plates thoroughly with detergent, rinse in distilled H O (dH 2 O), rinse with acetone, and finally rinse with 100% EtOH. 2) Mark plates at 10 cm (22% separating gel) and 11.75 cm (10% step gel).
• Sample 30 ⁇ L of 100 mg/mL protein (maximum concentration of protein) 80 ⁇ L formic acid (98%) (ICN cat#15162-90) 20 ⁇ L Acid Loading Buffer (80% formic acid, 60% sucrose and 0.02% methyl green; Make buffer by dissolving 6 g sucrose in ⁇ 8 mL of -99% formic acid. Heat and agitate the mixture. After the sucrose has dissolved, the volume of the solution is adjusted to 10 mL with -99% formic acid. Add 2 ⁇ L of 1% methyl green solution.) l ⁇ l ⁇ -Mercaptoethanol *Note: Adjust volumes as needed. However, ensure that the final formic acid concentration is always between 70% to 90%.
• Ladders Pharmacia molecular weight markers, M.W. Range 2,512-16,949 (cat#80-l 129-83). Reconstitute protein in 1 mL PBS. Freeze 10 ⁇ L aliquots at -20°C. Thaw 1 aliquot for every ladder needed and add 90 ⁇ L of formic acid (98%), 20 ⁇ L of Acid Loading Buffer, and 1 ⁇ L of ⁇ -Mercaptoethanol. *Note: Do not reconstitute these ladders according to manufacturer's instructions (because SDS will cause the ladder to smear). BSA samples: Distortion occurs for the outside two lanes of every gel run.
• BSA samples 1 ⁇ L of 5% BSA, 90 ⁇ L formic acid (98%), 20 ⁇ L Acid Loading Buffer, and 1 ⁇ L of ⁇ - Mercaptoethanol.
• Running the Gel Pre-Run Assemble the apparatus in a cold room. Fill the bottom chamber (three-fourths the volume) with pre-chilled Acid Gel Running Buffer. Add appropriate amount of buffer to the top reservoir. Pre-run the gel Anode to Cathode at 250 volts for 30 minutes. * Remove any air bubbles at the bottom of the gel and verify that the buffer has not leaked from the top reservoir.
• Step-Voltage Run the gel Anode to Cathode as follows: ⁇ 15 minutes at 25 volts ⁇ 15 minutes at 50 volts ⁇ 15 minutes at 100 volts ⁇ 15 minutes at 200 volts ⁇ - 15 hours at 275 volts **Run the gel overnight until the dye front is - 2 to 2.5cm from the bottom, which is generally the next morning if the gel was started in the late afternoon.
• Transfer Conditions for the Acid Urea Gel (run in 4°C cold room The night before transfer, make the following buffer and store in the cold room.
• Transfer Buffer Tris-Base 12.36 g Glycine 57.6 g Methanol 800 mL dH 2 O Up to 4 liters. Neutralize the acid-urea gel prior to transfer. Carefully remove the gel and place it in a washed glass tray. Add 200 mL of transfer buffer and rock gently for 15 minutes. Repeat this wash step a total of four times. Perform transfer as per normal (2.5 hours at 100 volts).
• Ponceau S Staining and Destaining After transfer, visualize the proteins in the ladder by Ponceau-S staining. The nitrocellulose is stained for 5 minutes in a solution of 0.1% Pon-S in 5% acetic acid. After destaining the membrane with dH 2 0 (three very short washes), digitally scan the membrane and mark the ladders with a dull pencil. Save the file. *Note: This ladder is used as solely for alignment purposes. This technique separates peptides according to their molecular weight (size) and charge. For example, two peptides of the same molecular weight but with differing charges probably do not have the same net mobility.
• Blocking Step Block membrane in 5% Milk in IX tris-buffered saline/0.125% Tween 20®
• Primary Antibody Use a selected number of anti-A ⁇ antibodies (e.g. 3) such that the binding epitopes of the selected antibodies bind to different regions on the A ⁇ peptide. Ensure that the selected antibodies also allow for standard visualization of at least 79 pg.
• Primary . antibody solution is in 0.5% Milk TBS/T with, for example, 1:1000 dilution of the selected antibodies at 20 mL total volume. Leave in primary antibody overnight on a rocker.
• the maximum sensitivity of this procedure is dependent upon the reagents used during the Western blotting procedure.
• the maximum sensitivity of this assay is -1 pg/ ⁇ g IgG.
• the IgG concentration (mg/mL) is determined by measuring the absorbance at 280 run and dividing that value by an extinction coefficient of 1.4. Analyses for samples generated according to this example provided the following results:
• Example 2 Purification of anti-A ⁇ antibody by acid dissociation of antibody and A ⁇ peptide.
• An anti-A ⁇ antibody is expressed from HEK 293 cells grown in cell culture.
• the antibody is purified by applying the culture medium to a Protein A-agarose column and is eluted with 100 mM glycine buffer, pH 3.1.
• the pool of fractions eluted from Protein A is adjusted to about pH 7.4 by adding a small volume of 1M Tris buffer, pH 8.0. This pool of eluted fractions is then adjusted to about pH 2 by diluting 1 : 1 into 1 M glycine, pH 2.
• the acidified pool is subjected to size exclusion chromatography on a 26/60 Superdex 200 column (Amersham) using a mobile phase of 50 mM glycine, 150 mM NaCl, pH 2 at a flow rate of 30 cm/hr.
• the antibody eluted from the size exclusion column is neutralized by adding Tris buffer and is dialyzed against PBS at pH 7.4.
• Denaturing acid/urea gradient polyacrylamide gel analyses provide mass estimations of A ⁇ peptide in units of pg per ⁇ g IgG for samples generated according to this acid dissociation method of purification.
• Example 3 Expression of anti-A ⁇ antibody in NSO cells.
• An anti-A ⁇ antibody is expressed from NSO cells grown in cell culture. The antibody is purified by applying the culture medium to a Protein A-agarose column and is eluted with 100 mM glycine buffer, pH 3.1. The pool of fractions eluted from Protein A is adjusted to about pH 7.4 by adding 1M Tris buffer, pH 8.0. This pool of eluted fractions is then diluted 1:1 with PBS and is subjected to size exclusion chromatography on a 26/60 Superdex 200 column (Amersham) using a mobile phase of PBS, 150 mM NaCl , pH 7.4 at a flow rate of 30 cm hr.
• the antibody eluted from the size exclusion column is dialyzed against PBS at pH 7.4. Using denaturing acid/urea gradient polyacrylamide gel analysis, no A ⁇ peptide was detected in anti-A ⁇ antibodies produced by this method.
• ELISA analysis is used to quantitate the concentration of A ⁇ peptide.
• Wells of a 96-well ELISA plate (Nunc MaxiSorpTM F96 or C96) are coated with anti-A ⁇ antibodies (e.g. 2 or more) - that will recognize epitopes outside of the central A ⁇ peptide (e.g. 17- 25) binding region - at a concentration of, for example, 7.5 ⁇ g/mL of each antibody in a coating buffer overnight at refrigerated conditions.
• Equivalent dilutions are spiked with an additional 0.4 ng/mL synthetic rodent A ⁇ peptide 1-40 to ensure accurate quantitation in the diluted sample matrix.
• synthetic rodent A ⁇ peptide 1-40 along with purified anti-A ⁇ antibody (with ⁇ 1 ppm total rodent A ⁇ peptide) is used.
• Control samples containing antibody (for total A ⁇ peptide control) and synthetic rodent A ⁇ peptide 1-42 spiked into the antibody (for A ⁇ peptide 1-42 control) are also tested.
• the ELISA plate is incubated for 1 to 2 hours at room temperature. The wells are washed 4X with Washing Buffer and are aspirated.
• Absorbance is read at 405 nm using a microplate reader when the color develops sufficiently (usually 2.0 to 2.5 absorbance units) for the standards.
• the limit of detection is 0.02 ng/mL.
• the limit of quantitation is 0.1 ng/mL.
• Concentration determinations for the standards are determined by AAA analysis.
• the IgG concentration is determined by measuring the absorbance at 280 nm and dividing that value by an extinction coefficient of 1.4. Using this ELISA analysis on anti-A ⁇ antibodies expressed in NSO cells as described above, no A ⁇ peptide was detected.
• Example 4 Cation exchange reduction of A ⁇ peptide in a preparation of humanized anti-A ⁇ antibody.
• a humanized anti-A ⁇ antibody preparation is expressed in CHO cells.
• the antibody is purified by applying the culture medium to a Protein A-agarose column and is eluted with 100 mM glycine buffer, pH 3.1. The pool of fractions eluted from Protein A is adjusted to about pH 7.4 by adding 1M Tris buffer, pH 8.0.
• the antibody preparation contains 15-20 ppm hamster A ⁇ peptide, as determined by ELISA.
• the antibody is further purified by cation exchange chromatography as follows.
• the starting antibody material is diafiltered against 50mM sodium acetate at pH 5.2 (5 volumes, using a 30k cut-off PES tangential-flow ultra filter) to decrease the conductivity in preparation for loading onto the cation exchange column.
• the diafiltered protein solution is then applied to a SP Sepharose High Performance (GE Healthcare) column (0.66 x 15cm, loaded at 15 mg of protein per mL of column volume) equilibrated in 50mM sodium acetate at pH 5.2. All operations are performed at room temperature and a linear flow rate of 115 cm/hr.
• the column is washed with 5 column volumes of 50mM sodium acetate at pH 5.2 and the antibody is eluted either stepwise (5 column volumes of 50mM sodium acetate, 135mM NaCl, pH 5.2) or with a linear 15 column volume gradient from 0 to 150mM NaCl in 50mM sodium acetate, pH 5.2. Fractions from the main peak are combined (to achieve a yield of approximately 90%). Anti-A ⁇ antibodies purified in this manner resulted in pools having lower A ⁇ peptide content than the starting material (10 ppm for the step eluted material and 9 ppm for the gradient eluted material).
• Example 5 Immunopurification reduction of A ⁇ in anti-A ⁇ antibodies
• An anti-A ⁇ antibody which binds in the central domain of human A ⁇ between amino acids 13-28 is expressed from HEK 293 cells grown in cell culture. Contaminating human A ⁇ peptide is separated from this antibody by immunopurification using a monoclonal antibody directed against the carboxyl terminus of Abeta 40, 2G3, coupled to agarose beads. The antibody preparation is rotated overnight with the 2G3 coupled beads at a 10:1 volume ratio. Following the overnight incubation, the agarose beads are pelleted to remove 2G3-A ⁇ complexes. ELISA is then used to determine the amount of A ⁇ peptide present in the anti-A ⁇ antibody before and after immunopurification.

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