EP1115867A1 - Menschliche interleukin-b50. therapeutische verwendungen - Google Patents

Menschliche interleukin-b50. therapeutische verwendungen

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Publication number
EP1115867A1
EP1115867A1 EP99949626A EP99949626A EP1115867A1 EP 1115867 A1 EP1115867 A1 EP 1115867A1 EP 99949626 A EP99949626 A EP 99949626A EP 99949626 A EP99949626 A EP 99949626A EP 1115867 A1 EP1115867 A1 EP 1115867A1
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EP
European Patent Office
Prior art keywords
cell
binding
cells
seq
polypeptide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP99949626A
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English (en)
French (fr)
Inventor
J. Fernando Bazan
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Merck Sharp and Dohme LLC
Original Assignee
Schering Corp
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Filing date
Publication date
Application filed by Schering Corp filed Critical Schering Corp
Priority to EP10180754A priority Critical patent/EP2314696A1/de
Priority to EP07013358.2A priority patent/EP1897949B1/de
Publication of EP1115867A1 publication Critical patent/EP1115867A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/52—Cytokines; Lymphokines; Interferons
    • C07K14/54—Interleukins [IL]
    • 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
    • A61P37/02—Immunomodulators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

  • the present invention pertains to compositions related to proteins which function in controlling biology and physiology of mammalian cells, e.g., cells of a mammalian immune system.
  • mammalian cells e.g., cells of a mammalian immune system.
  • it provides purified genes, proteins, antibodies, and related reagents useful, e.g., to regulate activation, development, differentiation, and function of various cell types, including hematopoietic cells.
  • Recombinant DNA technology refers generally to the technique of integrating genetic information from a donor source into vectors for subsequent processing, such as through introduction into a host, whereby the transferred genetic information is copied and/or expressed in the new environment.
  • the genetic information exists in the form of complementary DNA (cDNA) derived from messenger RNA (mRNA) coding for a desired protein product.
  • cDNA complementary DNA
  • mRNA messenger RNA
  • the carrier is frequently a plasmid having the capacity to incorporate cDNA for later replication in a host and, in some cases, actually to control expression of the cDNA and thereby direct synthesis of the encoded product in the host.
  • hematopoietic growth and/or differentiation factors e.g., stem cell factor (SCF) and IL-7.
  • SCF stem cell factor
  • IL-7 hematopoietic growth and/or differentiation factors
  • Lymphokines apparently mediate cellular activities in a variety of ways. They have been shown to support the proliferation, growth, and differentiation of pluripotential hematopoietic stem cells into vast numbers of progenitors comprising diverse cellular lineages making up a complex immune system. Proper and balanced interactions between the cellular components are necessary for a healthy immune response. The different cellular lineages often respond in a different manner when lymphokines are administered 'in conjunction with other agents.
  • B-cells which can produce and secrete immunoglobulins (proteins with the capability of recognizing and binding to foreign matter to effect its removal)
  • T-cells of various subsets that secrete lymphokines and induce or suppress the B-cells and various other cells (including other T-cells) making up the immune network.
  • lymphocytes interact with many other cell types .
  • mast cell which has not been positively identified in all mammalian species
  • mast cell is a granule-containing connective tissue cell located proximal to capillaries throughout the body. These cells are found in especially high concentrations in the lungs, skin, and gastrointestinal and genitourinary tracts .
  • Mast cells play a central role in allergy-related disorders, particularly anaphylaxis as follows: when selected antigens crosslink one class of immunoglobulins bound to receptors on the mast cell surface, the mast cell degranulates and releases mediators, e.g., histamine, serotonin, heparin, and prostaglandins, which cause allergic reactions, e.g., anaphylaxis.
  • lymphokines e.g., related to IL-7
  • T-cell and other cell supernatants which contain various growth factors, including many of the lymphokines .
  • new lymphokines e.g., related to IL-7
  • lymphokines which enhance or potentiate the beneficial activities of known lymphokines would be highly advantageous.
  • the present invention provides new interleukin compositions and related compounds, and methods for their use.
  • the present invention is directed to mammalian, e.g., rodent, canine, feline, primate, interleukin-B50 (IL-B50) and its biological activities. It includes nucleic acids coding for polypeptides themselves and methods for their production and use .
  • the nucleic acids of the invention are characterized, in part, by their homology to cloned complementary DNA (cDNA) sequences enclosed herein, and/or by functional assays for growth factor- or cytokine-like activities, e.g., IL-7 (see Maeurer, et al .
  • primate e.g., human
  • Functional equivalents exhibiting significant sequence homology will be available from other mammalian, e.g., cow, horse, and rat, mouse, and non-mammalian species.
  • the invention provides: a substantially pure or recombinant IL-B50 polypeptide exhibiting identity over a length of at least about 12 amino acids to SEQ ID NO: 2 or 4; a natural sequence IL-B50 of SEQ ID NO: 2 or 4 ; and a fusion protein comprising IL-B50 sequence.
  • the segment of identity is at least about 14, 17, or 19 amino acids.
  • the IL-B50 comprises a mature sequence comprising the sequence from Table 1; or exhibits a post-translational modification pattern distinct from natural IL-B50; or the polypeptide: is from a warm blooded animal selected from a mammal, including a primate; comprises at least one polypeptide segment of SEQ ID NO: 2 or 4; exhibits a plurality of fragments; is a natural allelic variant of IL-B50; has a length at least about 30 amino acids; exhibits at least two non-overlapping epitopes which are specific for a primate IL- B50; exhibits sequence identity over a length of at least about 20 amino acids to primate IL-B50; is glycosylated; has a molecular weight of at least 10 kD with natural glycosyla ion; is a synthetic polypeptide; is attached to a solid substrate; is conjugated to another chemical moiety; is a 5-fold or less substitution from natural sequence; or is a deletion or insertion variant
  • Preferred embodiments include a composition comprising: a sterile IL-B50 polypeptide; or the IL-B50 polypeptide and a carrier, wherein the carrier is: an aqueous compound, including water, saline, and/or buffer; and/or formulated for oral, rectal, nasal, topical, or parenteral administration.
  • the protein can have: mature polypeptide sequence from Table 1; a detection or purification tag, including a FLAG, His ⁇ , or Ig sequence; and/or sequence of another cytokine or chemokine, including an IL-7.
  • Kit embodiments include those with an IL-B50 polypeptide, and: a compartment comprising the polypeptide; and/or instructions for use or disposal of reagents in the kit.
  • the compound may have an antigen binding site from an antibody, which specifically binds to a natural IL-B50 polypeptide, wherein: the IL-B50 is a primate protein; the binding compound is an Fv, Fab, or Fab2 fragment; the binding compound is conjugated to another chemical moiety; or the antibody: is raised against a peptide sequence of a mature polypeptide portion from Table 1; is raised against a mature IL-B50; is raised to a purified primate IL-B50; is immunoselected; is a polyclonal antibody; binds to a denatured IL-B50; exhibits a Kd of at least 30 ⁇ M; is attached to a solid substrate, including a bead or plastic membrane; is in a sterile composition; or is detectably labeled, including a radioactive or fluorescent label.
  • the IL-B50 is a primate protein
  • the binding compound is an Fv, Fab, or Fab2 fragment
  • the binding compound is conjug
  • Kits containing binding compounds include those with: a compartment comprising the binding compound; and/or instructions for use or disposal of reagents in the kit. Often the kit is capable of making a qualitative or quantitative analysis.
  • Preferred compositions will comprise: a sterile binding compound; or the binding compound and a carrier, wherein the carrier is: an aqueous compound, including water, saline, and/or buffer; and/or formulated for oral, rectal, nasal, topical, or parenteral administration.
  • Nucleic acid embodiments include an isolated or recombinant nucleic acid encoding an IL-B50 polypeptide or fusion protein, wherein: the IL-B50 is from a primate; and/or the nucleic acid: encodes an antigenic peptide sequence of Table 1; encodes a plurality of antigenic peptide sequences of Table 1; exhibits identity to a natural cDNA encoding the segment; is an expression vector; further comprises an origin of replication; is from a natural source; comprises a detectable label; comprises synthetic nucleotide sequence; is less than 6 kb, preferably less than 3 kb; is from a primate, including a human; comprises a natural full length coding sequence; is a hybridization probe for a gene encoding the IL-B50; or is a PCR primer, PCR product, or mutagenesis primer.
  • the invention also provides a cell, tissue, or organ comprising such a recombinant nucleic acid, and preferably the cell will be: a prokaryotic cell; a eukaryotic cell; a bacterial cell; a yeast cell; an insect cell; a mammalian cell; a mouse cell; a primate cell; or a human cell.
  • Kit embodiments include those with such nucleic acids, and: a compartment comprising the nucleic acid; a compartment further comprising the IL-B50 protein or polypeptide; and/or instructions for use or disposal of reagents in the kit.
  • the kit is capable of making a qualitative or quantitative analysis.
  • the nucleic acid hybridizes under wash conditions of 30° C and less than 2M salt, or of 45° C and/or 500 mM salt, or 55° C and/or 150 mM salt, to SEQ ID NO: 1 or 3; or exhibits identity over a stretch of at least about 30, 55, or 75 nucleotides, to a primate IL-B50.
  • the invention embraces a method of modulating physiology or development of a cell or tissue culture cells comprising contacting the cell with an agonist or antagonist of a primate IL-B50.
  • the method may be where: the contacting is in combination with an agonist or antagonist of IL-7; or the contacting is with an antagonist, including a binding composition comprising an antibody binding site which specifically binds an IL-B50.
  • the present invention provides amino acid sequences and DNA sequences encoding various mammalian proteins which are cytokines, e.g., which are secreted molecules which can mediate a signal between immune or other cells. See, e.g., Paul (1997) Fundamental Immunoloqy (3d ed. ) Raven Press, N.Y. The full length cytokines, and fragments, or antagonists will be useful in physiological modulation of cells expressing a receptor.
  • IL-B50 has either stimulatory or inhibitory effects on hematopoietic cells, including, e.g., lymphoid cells, such as T-cells, B-cells, natural killer (NK) cells, macrophages, dendritic cells, hematopoietic progenitors, etc.
  • lymphoid cells such as T-cells, B-cells, natural killer (NK) cells, macrophages, dendritic cells, hematopoietic progenitors, etc.
  • NK natural killer
  • the proteins will also be useful as antigens, e.g., immunogens, for raising antibodies to various epitopes on the protein, both linear and conformational epitopes .
  • a cDNA encoding IL-B50 was identified from a human cDNA sequence. See, e.g., Accession number AA889581. The molecule was designated huIL-B50. The human gene will encode a small soluble cytokine-like protein, of about 175 amino acids. The signal sequence probably is about 33 residues, and would run from the met to about thr. See Table 1 and SEQ ID. NO: 1 and 2; supplementary- sequence provides SEQ ID NO: 3 and 4.
  • IL-B50 exhibits structural motifs characteristic of a member of the short chain cytokines. Compare, e.g., IL-B50 and IL-7, sequences available from GenBank. See also Table 2.
  • Table 1 Nucleic acid (SEQ ID NO: 1) encoding IL-B50 from a primate, e. human.
  • Translated amino acid sequence is SEQ ID NO: 2.
  • YDFTNCDFEKIKAAYLSTISKDLITYMSGTKSTEFNNTVSCSNRPHCLTEIQ ⁇ LTFNPNRXVRSLAKEMFAM TKAALAI CPGYSETQINATQAMKKRRKRKVTTNKCLEQVSQL Supplemental primate e.g., human, sequence (SEQ ID NO: 3 and 4); predicted signal cleavage position indicated: ATG TTC CCT TTT GCC TTA CTA TAT GTT CTG TCA GTT TCT TTC AGG AAA 48 Met Phe Pro Phe Ala Leu Leu Tyr Val Leu Ser Val Ser Phe Arg Lys -28 -25 -20 -15
  • TKAALAIWCPGYSETQINATQAMKKRRKRKVTTNKCLEQVSQLQGL RRFNRPLLKQQ Table 2 Comparison of various IL-7 embodiments compared to IL-B50.
  • the IL-7 from sheep is SEQ ID NO: 5; from bovine is SEQ ID NO: 6; from human is SEQ ID NO: 7; from mouse is SEQ ID NO: 8; and from rat is SEQ ID NO: 9. See also GenBank.
  • Comparison of the sequences will also provide an evolutionary tree. This can be generated, e.g., using the TreeView program in combination with the ClustalX analysis software program. See Thompson, et al . Nuc . Acids Res. 25:4876-4882; and TreeView, Page, IBLS, University of Glasgow, e- mail rpage@bio.gla.ac.uk; http: //taxonomy . zoology .gla.ac .uk.rod. treeview.html .
  • the structural homology of IL-B50 to related cytokine proteins suggests related function of this molecule.
  • IL-B50 is a short chain cytokine exhibiting sequence similarity to IL-7. Many aspects of the biology of IL-7 is well recognized.
  • IL-B50 agonists, or antagonists may also act as functional or receptor antagonists, e.g., which block IL-7 binding to its respective receptors, or mediating the opposite actions.
  • IL-B50, or its antagonists may be useful in the treatment of abnormal medical conditions, including immune disorders, e.g., T cell immune deficiencies, chronic inflammation, or tissue rejection, or in cardiovascular or neurophysiological conditions.
  • Compositions combining the IL- B50 and IL-7 related reagents will often be used.
  • the natural antigens are capable of mediating various biochemical responses which lead to biological or physiological responses in target cells .
  • the preferred embodiment characterized herein is from human, but other primate, or other species counterparts exist in nature.
  • Primate e.g., human, IL-B50 amino acid sequence
  • SEQ ID NO: 2 or 4 Other naturally occurring nucleic acids which encode the protein can be isolated by standard procedures using the provided sequence, e.g., PCR techniques, or by hybridization. These amino acid sequences, provided amino to carboxy, are important in providing sequence information for the cytokine allowing for distinguishing the protein antigen from other proteins and exemplifying numerous variants.
  • peptide sequences allow preparation of peptides to generate antibodies to recognize such segments
  • nucleotide sequences allow preparation of oligonucleotide probes, both of which are strategies for detection or isolation, e.g., cloning, of genes encoding such sequences.
  • human soluble IL-B50 shall encompass, when used in a protein context, a protein having amino acid sequence corresponding to a soluble polypeptide shown in SEQ ID NO: 2 or 4, or significant fragments thereof.
  • Preferred embodiments comprise a plurality of distinct, e.g., nonoverlapping, segments of the specified length. Typically, the plurality will be at least two, more usually at least three, and preferably 5, 7, or even more. While the length minima are provided, longer lengths, of various sizes, may be appropriate, e.g., one of length 7, and two of length 12.
  • Binding components typically bind to an IL-B50 with high affinity, e.g., at least about 100 nM, usually better than about 30 nM, preferably better than about 10 nM, and more preferably at better than about 3 nM.
  • Counterpart proteins will be found in mammalian species other than human, e.g., other primates, ungulates, or rodents. Non- mammalian species should also possess structurally or functionally related genes and proteins, e.g., birds or amphibians .
  • polypeptide as used herein includes a significant fragment or segment, and encompasses a stretch of amino acid residues of at least about 8 amino acids, generally at least about 12 amino acids, typically at least about 16 amino acids, preferably at least about 20 amino acids, and, in particularly preferred embodiments, at least about 30 or more amino acids, e.g., 35, 40, 45, 50, etc.
  • Such fragments may have ends which begin and/or end at virtually all positions, e.g., beginning at residues 1, 2, 3, etc., and ending at, e.g., 150, 149, 148, etc., in all practical combinations.
  • Particularly interesting peptides have ends corresponding to structural domain boundaries, e.g., helices A, B, C, and/or D. See Tables 1 and 2.
  • binding composition refers to molecules that bind with specificity to IL-B50, e.g., in an antibody-antigen interaction.
  • the specificity may be more or less inclusive, e.g., specific to a particular embodiment, or to groups of related embodiments, e.g., primate, rodent, etc. It also includes compounds, e.g., proteins, which specifically associate with IL-B50, including in a natural physiologically relevant protein-protein interaction, either covalent or non- covalent .
  • the molecule may be a polymer, or chemical reagent.
  • a functional analog may be a protein with structural modifications, or it may be a molecule which has a molecular shape which interacts with the appropriate binding determinants .
  • the compounds may serve as agonists or antagonists of a receptor binding interaction, see, e.g., Goodman, et al . (eds.) Goodman & Gilman's: The Pharmacological Bases of Therapeutics (current ed.) Pergamon Press .
  • Substantially pure typically means that the protein is free from other contaminating proteins, nucleic acids, or other biologicals derived from the original source organism. Purity may be assayed by standard methods, typically by weight, and will ordinarily be at least about 40% pure, generally at least about 50% pure, often at least about 60% pure, typically at least about 80% pure, preferably at least about 90% pure, and in most preferred embodiments, at least about 95% pure. Carriers or excipients will often be added.
  • Solubility of a polypeptide or fragment depends upon the environment and the polypeptide. Many parameters affect polypeptide solubility, including temperature, electrolyte environment, size and molecular characteristics of the polypeptide, and nature of the solvent. Typically, the temperature at which the polypeptide is used ranges from about 4° C to about 65° C. Usually the temperature at use is greater than about 18° C. For diagnostic purposes, the temperature will usually be about room temperature or warmer, but less than the denaturation temperature of components in the assay. For therapeutic purposes, the temperature will usually be body temperature, typically about 37° C for humans and mice, though under certain situations the temperature may be raised or lowered in situ or in vitro.
  • the size and structure of the polypeptide should generally be in a substantially stable state, and usually not in a denatured state.
  • the polypeptide may be associated with other polypeptides in a quaternary structure, e.g., to confer solubility, or associated with lipids or detergents .
  • the solvent and electrolytes will usually be a biologically compatible buffer, of a type used for preservation of biological activities, and will usually approximate a physiological aqueous solvent. Usually the solvent will have a neutral pH, typically between about 5 and 10, and preferably about 7.5.
  • one or more detergents will be added, typically a mild non-denaturing one, e.g., CHS (cholesteryl hemisuccinate) or CHAPS (3- [3- cholamidopropyl) dimethylammonio] -1-propane sulfonate) , or a low enough concentration as to avoid significant disruption of structural or physiological properties of the protein.
  • CHS cholesteryl hemisuccinate
  • CHAPS 3- [3- cholamidopropyl) dimethylammonio] -1-propane sulfonate
  • a harsh detergent may be used to effect significant denaturation.
  • This invention also encompasses proteins or peptides having substantial amino acid sequence identity with the amino acid sequence of the IL-B50 antigen.
  • the variants include species, polymorphic, or allelic variants.
  • Amino acid sequence homology, or sequence identity is determined by optimizing residue matches, if necessary, by introducing gaps as required. See also Needleham, et al . (1970) J. Mol. Biol. 48:443-453; Sankoff, et al . (1983)
  • Sequence identity changes when considering conservative substitutions as matches.
  • Conservative substitutions typically include substitutions within the following groups: glycine, alanine; valine, isoleucine, leucine; aspartic acid, glutamic acid; asparagine, glutamine; serine, threonine; lysine, arginine; and phenylalanine, tyrosine.
  • the conservation may apply to biological features, functional features, or structural features .
  • Homologous amino acid sequences are typically intended to include natural polymorphic or allelic and interspecies variations of a protein sequence. Typical homologous proteins or peptides will have from 25-100% identity (if gaps can be introduced), to 50-100% identity (if conservative substitutions are included) with the amino acid sequence of the IL-B50. Identity measures will be at least about 35%, generally at least about 40%, often at least about 50%, typically at least about 60%, usually at least about 70%, preferably at least about 80%, and more preferably at least about 90%.
  • the isolated IL-B50 DNA can be readily modified by nucleotide substitutions, nucleotide deletions, nucleotide insertions, and inversions of short nucleotide stretches. These modifications result in novel DNA sequences which encode these antigens, their derivatives, or proteins having similar physiological, immunogenic, antigenic, or other functional activity. These modified sequences can be used to produce mutant antigens or to enhance expression. Enhanced expression may involve gene amplification, increased transcription, increased translation, and other mechanisms.
  • “Mutant IL-B50” encompasses a polypeptide otherwise falling within the sequence identity definition of the IL-B50 as set forth above, but having an amino acid sequence which differs from that of IL-B50 as normally found in nature, whether by way of deletion, substitution, or insertion. This generally includes proteins having significant identity with a protein having sequence of SEQ ID NO: 2 or 4, and as sharing various biological activities, e.g., antigenic or immunogenic, with those sequences, and in preferred embodiments contain most of the natural full length disclosed sequences . Full length sequences will typically be preferred, though truncated versions will also be useful, likewise, genes or proteins found from natural sources are typically most desired.
  • IL-B50 mutagenesis can also be conducted by making amino acid insertions or deletions. Substitutions, deletions, insertions, or any combinations may be generated to arrive at a final construct. Insertions include amino- or carboxy- terminal fusions. Random mutagenesis can be conducted at a target codon and the expressed mutants can then be screened for the desired activity.
  • substitution mutations at predetermined sites in DNA having a known sequence are well known in the art, e.g., by M13 primer mutagenesis or polymerase chain reaction (PCR) techniques. See, e.g., Sambrook, et al . (1989); Ausubel, et al . (1987 and Supplements); and Kunkel, et al . (1987) Methods in Enzymol . 154:367-382.
  • Preferred embodiments include, e.g., 1-fold, 2- fold, 3-fold, 5-fold, 7-fold, etc., preferably conservative substitutions at the nucleotide or amino acid levels.
  • the substitutions will be away from the conserved cysteines, and often will be in the regions away from the helical structural domains . Such variants may be useful to produce specific antibodies, and often will share many or all biological properties.
  • the present invention also provides recombinant proteins, e.g., heterologous fusion proteins using segments from these proteins.
  • a heterologous fusion protein is a fusion of proteins or segments which are naturally not normally fused in the same manner.
  • a similar concept applies to heterologous nucleic acid sequences .
  • new constructs may be made from combining similar functional domains from other proteins.
  • target-binding or other segments may be "swapped" between different new fusion polypeptides or fragments. See, e.g., Cunningham, et al . (1989) Science 243:1330-1336; and O'Dowd, et al. (1988) J. Biol. Chem. 263:15985-15992.
  • residues for substitutions include the surface exposed residues which would be predicted to interact with receptor. Other residues which should conserve function will be conservative substitutions, particularly at position far from the surface exposed residues .
  • the blocking of physiological response to IL-B50s may result from the competitive inhibition of binding of the ligand to its receptor.
  • In vitro assays of the present invention will often use isolated protein, soluble fragments comprising receptor binding segments of these proteins, or fragments attached to solid phase substrates . These assays will also allow for the diagnostic determination of the effects of either binding segment mutations and modifications, or cytokine mutations and modifications, e.g., IL-B50 analogs.
  • This invention also contemplates the use of competitive drug screening assays, e.g., where neutralizing antibodies to the cytokine, or receptor binding fragments compete with a test compound.
  • “Derivatives" of IL-B50 antigens include amino acid sequence mutants from naturally occurring forms, glycosylation variants, and covalent or aggregate conjugates with other chemical moieties. Covalent derivatives can be prepared by linkage of functionalities to groups which are found in IL-B50 amino acid side chains or at the N- or C- termini, e.g., by standard means. See, e.g., Lundblad and Noyes (1988) Chemical Reagents for Protein Modification, vols . 1-2, CRC Press, Inc., Boca Raton, FL; Hugli (ed. 1989) Techniques in Protein Chemistry, Academic Press, San Diego, CA; and Wong (1991) Chemistry of Protein Conjugation and Cross Linking, CRC Press, Boca Raton, FL.
  • glycosylation alterations are included, e.g., made by modifying the glycosylation patterns of a polypeptide during its synthesis and processing, or in further processing steps. See, e.g., Elbein (1987) Ann. Rev. Biochem. 56:497-534. Also embraced are versions of the peptides with the same primary amino acid sequence which have other minor modifications, including phosphorylated amino acid residues, e.g., phosphotyrosine, phosphoserine, or phosphothreonine .
  • Fusion polypeptides between IL-B50s and other homologous or heterologous proteins are also provided.
  • Many cytokine receptors or other surface proteins are multimeric, e.g., homodimeric entities, and a repeat construct may have various advantages, including lessened susceptibility to proteolytic cleavage.
  • Typical examples are fusions of a reporter polypeptide, e.g., luciferase, with a segment or domain of a protein, e.g., a receptor-binding segment, so that the presence or location of the fused ligand may be easily determined. See, e.g., Dull, et al . , U.S. Patent No. 4,859,609.
  • gene fusion partners include bacterial ⁇ - galactosidase, trpE, Protein A, ⁇ -lactamase, alpha amylase, alcohol dehydrogenase, yeast alpha mating factor, and detection or purification tags such as a FLAG sequence of His6 sequence. See, e.g., Godowski, et al . (1988) Science 241:812- 816. Fusion peptides will typically be made by either recombinant nucleic acid methods or by synthetic polypeptide methods . Techniques for nucleic acid manipulation and expression are described generally, e.g., in Sambrook, et al . (1989) Molecular Cloning: A Laboratory Manual (2d ed.), vols.
  • Refolding methods may be applicable to synthetic proteins .
  • This invention also contemplates the use of derivatives of IL-B50 proteins other than variations in amino acid sequence or glycosylation.
  • Such derivatives may involve covalent or aggregative association with chemical moieties or protein carriers.
  • Covalent or aggregative derivatives will be useful as immunogens, as reagents in immunoassays, or in purification methods such as for affinity purification of binding partners, e.g., other antigens.
  • An IL-B50 can be immobilized by covalent bonding to a solid support such as cyanogen bromide-activated SEPHAROSE, by methods which are well known in the art, or adsorbed onto polyolefin surfaces, with or without glutaraldehyde cross-linking, for use in the assay or purification of anti-IL-B50 antibodies or an alternative binding composition.
  • the IL-B50 proteins can also be labeled with a detectable group, e.g., for use in diagnostic assays.
  • Purification of IL-B50 may be effected by an immobilized antibody or complementary binding partner, e.g., binding portion of a receptor.
  • a solubilized IL-B50 or fragment of this invention can be used as an immunogen for the production of antisera or antibodies specific for binding.
  • Purified antigen can be used to screen monoclonal antibodies or antigen-binding fragments, encompassing antigen binding fragments of natural antibodies, e.g., Fab, Fab', F(ab)2, etc.
  • Purified IL-B50 antigens can also be used as a reagent to detect antibodies generated in response to the presence of elevated levels of the cytokine, which may be diagnostic of an abnormal or specific physiological or disease condition.
  • This invention contemplates antibodies raised against amino acid sequences encoded by nucleotide sequence shown in SEQ ID NO: 1 or 3 , or fragments of proteins containing it. In particular, this invention contemplates antibodies having binding affinity to or being raised against specific domains, e.g., helices A, B, C, or D.
  • the present invention contemplates the isolation of additional closely related species variants. Southern and Northern blot analysis will establish that similar genetic entities exist in other mammals. It is likely that IL-B50s are widespread in species variants, e.g., rodents, lagomorphs, carnivores, artiodactyla, perissodactyla, and primates.
  • the invention also provides means to isolate a group of related antigens displaying both distinctness and similarities in structure, expression, and function. Elucidation of many of the physiological effects of the molecules will be greatly accelerated by the isolation and characterization of additional distinct species or polymorphic variants of them.
  • the present invention provides useful probes for identifying additional homologous genetic entities in different species.
  • the isolated genes will allow transformation of cells lacking expression of an IL-B50, e.g., either species types or cells which lack corresponding proteins and exhibit negative background activity. This should allow analysis of the function of IL-B50 in comparison to untransformed control cells . Dissection of critical structural elements which effect the various physiological functions mediated through these antigens is possible using standard techniques of modern molecular biology, particularly in comparing members of the related class. See, e.g., the homolog-scanning mutagenesis technique described in Cunningham, et al . (1989) Science
  • Intracellular functions would probably involve receptor signaling. However, protein internalization may occur under certain circumstances, and interaction between intracellular components and cytokine may occur. Specific segments of interaction of IL-B50 with interacting components may be identified by mutagenesis or direct biochemical means, e.g., cross-linking or affinity methods. Structural analysis by crystallographic or other physical methods will also be applicable. Further investigation of the mechanism of signal transduction will include study of associated components which may be isolatable by affinity methods or by genetic means, e.g., complementation analysis of mutants.
  • IL-B50 The controlling elements associated with the antigens should exhibit differential physiological, developmental, tissue specific, or other expression patterns. Upstream or downstream genetic regions, e.g., control elements, are of interest. Structural studies of the IL-B50 antigens will lead to design of new antigens, particularly analogs exhibiting agonist or antagonist properties on the molecule. This can be combined with previously described screening methods to isolate antigens exhibiting desired spectra of activities .
  • Antibodies can be raised to various epitopes of the IL-B50 proteins, including species, polymorphic, or allelic variants, and fragments thereof, both in their naturally occurring forms and in their recombinant forms. Additionally, antibodies can be raised to IL-B50s in either their active forms or in their inactive forms, including native or denatured versions. Anti-idiotypic antibodies are also contemplated. Antibodies, including binding fragments and single chain versions, against predetermined fragments of the antigens can be raised by immunization of animals with conjugates of the fragments with immunogenic proteins . Monoclonal antibodies are prepared from cells secreting the desired antibody.
  • Antibodies can be screened for binding to normal or defective IL-B50s, or screened for agonistic or antagonistic activity, e.g., mediated through a receptor.
  • Antibodies may be agonistic or antagonistic, e.g., by sterically blocking binding to a receptor.
  • These monoclonal antibodies will usually bind with at least a Kp of about 1 mM, more usually at least about 300 ⁇ M, typically at least about 100 ⁇ M, more typically at least about 30 ⁇ M, preferably at least about 10 ⁇ M, and more preferably at least about 3 ⁇ M or better.
  • An IL-B50 protein that specifically binds to or that is specifically immunoreactive with an antibody generated against a defined immunogen, such as an immunogen consisting of the amino acid sequence of SEQ ID NO: 2 or 4, is typically determined in an immunoassay.
  • the immunoassay typically uses a polyclonal antiserum which was raised, e.g., to a protein of SEQ ID NO: 2 or 4. This antiserum is selected to have low crossreactivity against other IL-7, e.g., human or rodent IL- 7, preferably from the same species, and any such crossreactivity is removed by immunoabsorption prior to use in the immunoassay.
  • the protein of SEQ ID NO: 2 or 4, or a combination thereof is isolated as described herein.
  • recombinant protein may be produced in a mammalian cell line.
  • An appropriate host e.g., an inbred strain of mice such as Balb/c, is immunized with the selected protein, typically using a standard adjuvant, such as Freund's adjuvant, and a standard mouse immunization protocol (see Harlow and Lane, supra) .
  • a synthetic peptide derived from the sequences disclosed herein and conjugated to a carrier protein can be used an immunogen.
  • Polyclonal sera are collected and titered against the immunogen protein in an immunoassay, e.g., a solid phase immunoassay with the immunogen immobilized on a solid support.
  • Polyclonal antisera with a titer of 10 ⁇ or greater are selected and tested for their cross reactivity against other IL-7 family members, e.g., rodent IL-7, using a competitive binding immunoassay such as the one described in Harlow and Lane, supra, at pages 570-573.
  • IL-7 family members e.g., rodent IL-7
  • a competitive binding immunoassay such as the one described in Harlow and Lane, supra, at pages 570-573.
  • at least one other IL-7 family member is used in this determination in conjunction with, e.g., the primate IL-7.
  • the IL-7 family members can be produced as recombinant proteins and isolated using standard molecular biology and protein chemistry techniques as described herein.
  • Immunoassays in the competitive binding format can be used for the crossreactivity determinations.
  • the protein of SEQ ID NO: 4 can be immobilized to a solid support. Proteins added to the assay compete with the binding of the antisera to the immobilized antigen. The ability of the above proteins to compete with the binding of the antisera to the immobilized protein is compared to the protein of SEQ ID NO: 4. The percent crossreactivity for the above proteins is calculated, using standard calculations. Those antisera with less than 10% crossreactivity with each of the proteins listed above are selected and pooled. The cross-reacting antibodies are then removed from the pooled antisera by immunoabsorption with the above-listed proteins .
  • the immunoabsorbed and pooled antisera are then used in a competitive binding immunoassay as described above to compare a second protein to the immunogen protein (e.g., the IL-7 like protein of SEQ ID NO: 2 or 4) .
  • the two proteins are each assayed at a wide range of concentrations and the amount of each protein required to inhibit 50% of the binding of the antisera to the immobilized protein is determined. If the amount of the second protein required is less than twice the amount of the protein of the selected protein or proteins that is required, then the second protein is said to specifically bind to an antibody generated to the immunogen.
  • the antibodies of this invention can also be useful in diagnostic applications. As capture or non-neutralizing antibodies, they can be screened for ability to bind to the antigens without inhibiting binding to a receptor. As neutralizing antibodies, they can be useful in competitive binding assays. They will also be useful in detecting or quantifying IL-B50 protein or its receptors. See, e.g., Chan (ed. 1987) Immunology: A Practical Guide, Academic Press, Orlando, FL; Price and Newman (eds. 1991) Principles and Practice of Immunoassay, Stockton Press, N.Y.; and Ngo (ed. 1988) Nonisotopic Immunoassay, Plenum Press, N.Y. Cross absorptions, depletions, or other means will provide preparations of defined selectivity, e.g., unique or shared species specificities. These may be the basis for tests which will identify various groups of antigens.
  • the antibodies, including antigen binding fragments, of this invention can be potent antagonists that bind to the antigen and inhibit functional binding, e.g., to a receptor which may elicit a biological response. They also can be useful as non-neutralizing antibodies and can be coupled to toxins or radionuclides so that when the antibody binds to antigen, a cell expressing it, e.g., on its surface, is killed. Further, these antibodies can be conjugated to drugs or other therapeutic agents, either directly or indirectly by means of a linker, and may effect drug targeting.
  • Antigen fragments may be joined to other materials, particularly polypeptides, as fused or covalently joined polypeptides to be used as immunogens .
  • An antigen and its fragments may be fused or covalently linked to a variety of immunogens, such as keyhole limpet hemocyanin, bovine serum albumin, tetanus toxoid, etc. See Microbiology, Hoeber Medical Division, Harper and Row, 1969; Landsteiner (1962) Specificity of Serological Reactions, Dover Publications, New York; Williams, et al . (1967) Methods in Immunology and Immunochemistry, vol. 1, Academic Press, New York; and Harlow and Lane (1988) Antibodies: A Laboratory Manual, CSH Press, NY, for descriptions of methods of preparing polyclonal antisera.
  • monoclonal antibodies from various mammalian hosts, such as mice, rodents, primates, humans, etc.
  • Description of techniques for preparing such monoclonal antibodies may be found in, e.g., Stites, et al . (eds.) Basic and Clinical Immunology (4th ed.), Lange Medical Publications, Los Altos, CA, and references cited therein; Harlow and Lane (1988) Antibodies: A Laboratory Manual, CSH Press; Goding (1986) Monoclonal Antibodies: Principles and Practice (2d ed.), Academic Press, New York; and particularly in Kohler and Milstein (1975) in Nature 256:495-497, which discusses one method of generating monoclonal antibodies .
  • polypeptides and antibodies of the present invention may be used with or without modification, including chimeric or humanized antibodies. Frequently, the polypeptides and antibodies will be labeled by joining, either covalently or non-covalently, a substance which provides for a detectable signal.
  • labels and conjugation techniques are known and are reported extensively in both the scientific and patent literature. Suitable labels include radionuclides, enzymes, substrates, cofactors, inhibitors, fluorescent moieties, chemiluminescent moieties, magnetic particles, and the like. Patents, teaching the use of such labels include U.S. Patent Nos.
  • the antibodies of this invention can also be used for affinity chromatography in isolating the protein.
  • Columns can be prepared where the antibodies are linked to a solid support. See, e.g., Wilchek et al . (1984) Meth. Enzymol . 104:3-55. The converse may be used to purify antibodies.
  • Antibodies raised against each IL-B50 will also be useful to raise anti-idiotypic antibodies. These will be useful in detecting or diagnosing various immunological conditions related to expression of the respective antigens.
  • nucleic Acids The described peptide sequences and the related reagents are useful in detecting, isolating, or identifying a DNA clone encoding IL-B50, e.g., from a natural source. Typically, it will be useful in isolating a gene from mammal, and similar procedures will be applied to isolate genes from other species, e.g., warm blooded animals, such as birds and mammals. Cross hybridization will allow isolation of IL-B50 from the same, e.g., polymorphic variants, or other species. A number of different approaches will be available to successfully isolate a suitable nucleic acid clone.
  • the purified protein or defined peptides are useful for generating antibodies by standard methods, as described above.
  • Synthetic peptides or purified protein can be presented to an immune system to generate monoclonal or polyclonal antibodies. See, e.g., Coligan (1991) Current Protocols in Immunology Wiley/Greene; and Harlow and Lane (1989) Antibodies: A Laboratory Manual, Cold Spring Harbor Press.
  • the specific binding composition could be used for screening of an expression library made from a cell line which expresses an IL-B50. Screening of intracellular expression can be performed by various staining or immunofluorescence procedures. Binding compositions could be used to affinity purify or sort out cells expressing a surface fusion protein.
  • the peptide segments can also be used to predict appropriate oligonucleotides to screen a library.
  • the genetic code can be used to select appropriate oligonucleotides useful as probes for screening. See, e.g., SEQ ID NO: 1 or 3.
  • synthetic oligonucleotides will be useful in selecting correct clones from a library.
  • Complementary sequences will also be used as probes, primers, or antisense strands.
  • Various fragments should be particularly useful, e.g., coupled with anchored vector or poly-A complementary PCR techniques or with complementary DNA of other peptides .
  • This invention contemplates use of isolated DNA or fragments to encode a biologically active corresponding IL-B50 polypeptide, particularly lacking the portion coding the untranslated 5' portion of the described sequence.
  • this invention covers isolated or recombinant DNA which encodes a biologically active protein or polypeptide and which is capable of hybridizing under appropriate conditions with the DNA sequences described herein.
  • Said biologically active protein or polypeptide can be an intact antigen, or fragment, and have an amino acid sequence disclosed in, e.g., SEQ ID NO: 2 or 4 , particularly a mature, secreted polypeptide.
  • this invention covers the use of isolated or recombinant DNA, or fragments thereof, which encode proteins which exhibit high identity to a secreted IL- B50.
  • the isolated DNA can have the respective regulatory sequences in the 5' and 3' flanks, e.g., promoters, enhancers, poly-A addition signals, and others.
  • expression may be effected by operably linking a coding segment to a heterologous promoter, e.g., by inserting a promoter upstream from an endogenous gene. See, e.g., Treco, et al. W096/29411 or USSN 08/406,030.
  • nucleic acid is a nucleic acid, e.g., an RNA, DNA, or a mixed polymer, which is substantially separated from other components which naturally accompany a native sequence, e.g., ribosomes, polymerases, and/or flanking genomic sequences from the originating species.
  • the term embraces a nucleic acid sequence which has been removed from its naturally occurring environment, and includes recombinant or cloned DNA isolates and chemically synthesized analogs or analogs biologically synthesized by heterologous systems.
  • a substantially pure molecule includes isolated forms of the molecule.
  • the nucleic acid will be in a vector or fragment less than about 50 kb, usually less than about 30 kb, typically less than about 10 kb, and preferably less than about 6 kb .
  • An isolated nucleic acid will generally be a homogeneous composition of molecules, but will, in some embodiments, contain minor heterogeneity. This heterogeneity is typically found at the polymer ends or portions not critical to a desired biological function or activity.
  • a "recombinant" nucleic acid is defined either by its method of production or its structure. In reference to its method of production, e.g., a product made by a process, the process is use of recombinant nucleic acid techniques, e.g., involving human intervention in the nucleotide sequence, typically selection or production. Alternatively, it can be a nucleic acid made by generating a sequence comprising fusion of two fragments which are not naturally contiguous to each other, but is meant to exclude products of nature, e.g., naturally occurring mutants.
  • products made by transforming cells with any unnaturally occurring vector is encompassed, as are nucleic acids comprising sequence derived using any synthetic oligonucleotide process. Such is often done to replace a codon with a redundant codon encoding the same or a conservative amino acid, while typically introducing or removing a sequence recognition site.
  • nucleic acid segments of desired functions it is performed to join together nucleic acid segments of desired functions to generate a single genetic entity comprising a desired combination of functions not found in the commonly available natural forms.
  • Restriction enzyme recognition sites are often the target of such artificial manipulations, but other site specific targets, e.g., promoters, DNA replication sites, regulation sequences, control sequences, or other useful features may be incorporated by design.
  • site specific targets e.g., promoters, DNA replication sites, regulation sequences, control sequences, or other useful features may be incorporated by design.
  • a similar concept is intended for a recombinant, e.g., fusion, polypeptide.
  • synthetic nucleic acids which, by genetic code redundancy, encode polypeptides similar to fragments of these antigens, and fusions of sequences from various different species or polymorphic variants.
  • a significant "fragment" in a nucleic acid context is a contiguous segment of at least about 17 nucleotides, generally at least about 22 nucleotides, ordinarily at least about 29 nucleotides, more often at least about 35 nucleotides, typically at least about 41 nucleotides, usually at least about 47 nucleotides, preferably at least about 55 nucleotides, and in particularly preferred embodiments will be at least about 60 or more nucleotides, e.g., 67, 73, 81, 89, 95, etc.
  • a DNA which codes for an IL-B50 protein will be particularly useful to identify genes, mRNA, and cDNA species which code for related or similar proteins, as well as DNAs which code for homologous proteins from different species . There will be homologs in other species, including primates, rodents, canines, felines, and birds. Various IL-B50 proteins should be homologous and are encompassed herein. However, even proteins that have a more distant evolutionary relationship to the antigen can readily be isolated under appropriate conditions using these sequences if they are sufficiently homologous. Primate IL-B50 proteins are of particular interest .
  • Recombinant clones derived from the genomic sequences, e.g., containing introns, will be useful for transgenic studies, including, e.g., transgenic cells and organisms, and for gene therapy. See, e.g., Goodnow (1992) "Transgenic Animals” in Roitt (ed.) Encyclopedia of Immunology, Academic Press, San Diego, pp. 1502-1504; Travis (1992) Science 256:1392-1394; Kuhn, et al . (1991) Science 254:707-710; Capecchi (1989) Science 244:1288; Robertson (ed. 1987) Teratocarcinomas and Embryonic Stem Cells : A Practical Approach, IRL Press, Oxford; and Rosenberg (1992) J. Clinical Oncology 10:180-199.
  • Substantial homology in the nucleic acid sequence comparison context means either that the segments, or their complementary strands, when compared, are identical when optimally aligned, with appropriate nucleotide insertions or deletions, in at least about 50% of the nucleotides, generally at least about 58%, ordinarily at least about 65%, often at least about 71%, typically at least about 77%, usually at least about 85%, preferably at least about 95 to 98% or more, and in particular embodiments, as high as about 99% or more of the nucleotides.
  • telomere sequence e.g., in SEQ ID NO: 1 or 3.
  • selective hybridization will occur when there is at least about 55% identity over a stretch of at least about 30 nucleotides, preferably at least about 75% over a stretch of about 25 nucleotides, and most preferably at least about 90% over about 20 nucleotides. See, Kanehisa (1984) Nuc . Acids Res . 12:203-213.
  • the length of identity comparison may be over longer stretches, and in certain embodiments will be over a stretch of at least about 17 nucleotides, usually at least about 28 nucleotides, typically at least about 40 nucleotides, and preferably at least about 75 to 100 or more nucleotides.
  • Stringent conditions in referring to homology in the hybridization context, will be stringent combined conditions of salt, temperature, organic solvents, and other parameters, typically those controlled in hybridization reactions.
  • Stringent temperature conditions will usually include temperatures in excess of about 30° C, usually in excess of about 37° C, typically in excess of about 55° C, 60° C, 65° C, or preferably in excess of about 70° C.
  • Stringent salt conditions will ordinarily be less than about 1000 or 600 mM usually less than about 400 mM, typically less than about 250 mM, preferably less than about 150 mM, including about 100, 50, or even 20 mM. However, the combination of parameters is much more important than the measure of any single parameter.
  • Hybridization under stringent conditions should give a background of at least 2-fold over background, preferably at least 3-5 or more.
  • sequence comparison typically one sequence acts as a reference sequence, to which test sequences are compared.
  • test and reference sequences are input into a computer, subsequence coordinates are designated, if necessary, and sequence algorithm program parameters are designated.
  • sequence comparison algorithm then calculates the percent sequence identity for the test sequence (s) relative to the reference sequence, based on the designated program parameters.
  • Optical alignment of sequences for comparison can be conducted, e.g., by the local homology algorithm of Smith and Waterman (1981) Adv. Appl . Math. 2:482, by the homology alignment algorithm of Needleman and Wunsch (1970) J . Mol .
  • PILEUP creates a multiple sequence alignment from a group of related sequences using progressive, pairwise alignments to show relationship and percent sequence identity. It also plots a tree or dendrogram showing the clustering relationships used to create the alignment. PILEUP uses a simplification of the progressive alignment method of Feng and Doolittle (1987) J ⁇ Mol . Evol . 35:351-360. The method used is similar to the method described by Higgins and Sharp (1989) CABIOS 5:151-153. The program can align up to 300 sequences, each of a maximum length of 5,000 nucleotides or amino acids. The multiple alignment procedure begins with the pairwise alignment of the two most similar sequences, producing a cluster of two aligned sequences .
  • This cluster is then aligned to the next most related sequence or cluster of aligned sequences .
  • Two clusters of sequences are aligned by a simple extension of the pairwise alignment of two individual sequences.
  • the final alignment is achieved by a series of progressive, pairwise alignments.
  • the program is run by designating specific sequences and their amino acid or nucleotide coordinates for regions of sequence comparison and by designating the program parameters. For example, a reference sequence can be compared to other test sequences to determine the percent sequence identity relationship using the following parameters: default gap weight (3.00), default gap length weight (0.10), and weighted end gaps .
  • BLAST algorithm Another example of algorithm that is suitable for determining percent sequence identity and sequence similarity is the BLAST algorithm, which is described Altschul, et al. (1990) J. Mol. Biol. 215:403-410. Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information
  • HSPs high scoring sequence pairs
  • Extension of the word hits in each direction are halted when: the cumulative alignment score falls off by the quantity X from its maximum achieved value; the cumulative score goes to zero or below, due to the accumulation of one or more negative-scoring residue alignments; or the end of either sequence is reached.
  • the BLAST algorithm parameters W, T, and X determine the sensitivity and speed of the alignment.
  • the BLAST algorithm In addition to calculating percent sequence identity, the BLAST algorithm also performs a statistical analysis of the similarity between two sequences (see, e.g., Karlin and Altschul (1993) Proc. Nat ' 1 Acad. Sci. USA 90:5873-5787) .
  • One measure of similarity provided by the BLAST algorithm is the smallest sum probability (P(N)), which provides an indication of the probability by which a match between two nucleotide or amino acid sequences would occur by chance.
  • P(N) the smallest sum probability
  • a nucleic acid is considered similar to a reference sequence if the smallest sum probability in a comparison of the test nucleic acid to the reference nucleic acid is less than about 0.1, more preferably less than about 0.01, and most preferably less than about 0.001.
  • a further indication that two nucleic acid sequences of polypeptides are substantially identical is that the polypeptide encoded by the first nucleic acid is immunologically cross reactive with the polypeptide encoded by the second nucleic acid, as described below.
  • a polypeptide is typically substantially identical to a second polypeptide, for example, where the two peptides differ only by conservative substitutions .
  • Another indication that two nucleic acid sequences are substantially identical is that the two molecules hybridize to each other under stringent conditions, as described below.
  • IL-B50 from other mammalian species can be cloned and isolated by cross-species hybridization of closely related species . Homology may be relatively low between distantly related species, and thus hybridization of relatively closely related species is advisable. Alternatively, preparation of an antibody preparation which exhibits less species specificity may be useful in expression cloning approaches.
  • DNA which encodes the IL-B50 or fragments thereof can be obtained by chemical synthesis, screening cDNA libraries, or screening genomic libraries prepared from a wide variety of cell lines or tissue samples. See, e.g., Okayama and Berg (1982) Mol. Cell. Biol. 2:161-170; Gubler and Hoffman (1983) Gene 25:263-269; and Glover (ed. 1984) DNA Cloning: A Practical Approach, IRL Press, Oxford.
  • the sequences provided herein provide useful PCR primers or allow synthetic or other preparation of suitable genes encoding an IL-B50; including naturally occurring embodiments.
  • This DNA can be expressed in a wide variety of host cells for the synthesis of a full-length IL-B50 or fragments which can in turn, e.g., be used to generate polyclonal or monoclonal antibodies; for binding studies; for construction and expression of modified molecules; and for structure/function studies.
  • Vectors as used herein, comprise plasmids, viruses, bacteriophage, integratable DNA fragments, and other vehicles which enable the integration of DNA fragments into the genome of the host. See, e.g., Pouwels, et al . (1985 and Supplements) Cloning Vectors: A Laboratory Manual, Elsevier, N.Y. ; and Rodriguez, et al . (eds. 1988) Vectors : A Survey of Molecular Cloning Vectors and Their Uses, Buttersworth, Boston, MA.
  • DNA sequences are operably linked when they are functionally related to each other.
  • DNA for a presequence or secretory leader is operably linked to a polypeptide if it is expressed as a preprotein or participates in directing the polypeptide to the cell membrane or in secretion of the polypeptide.
  • a promoter is operably linked to a coding sequence if it controls the transcription of the polypeptide;
  • a ribosome binding site is operably linked to a coding sequence if it is positioned to permit translation.
  • operably linked means contiguous and in reading frame, however, certain genetic elements such as repressor genes are not contiguously linked but still bind to operator sequences that in turn control expression.
  • Suitable expression vectors include pCDNAl; pCD, see Okayama, et al . (1985) Mol. Cell Biol. 5:1136-1142; pMClneo Poly-A, see Thomas, et al . (1987) Cell 51:503-512; and a baculovirus vector such as pAC 373 or pAC 610. See, e.g., Miller (1988) Ann. Rev. Microbiol. 42:177-199.
  • IL-B50 polypeptide in a system which provides a specific or defined glycosylation pattern. See, e.g., Luckow and Summers (1988) Bio/Technology 6:47-55; and Kaufman (1990) Meth. Enzvmol . 185:487-511.
  • the IL-B50 may be engineered to be phosphatidyl inositol (PI) linked to a cell membrane, but can be removed from membranes by treatment with a phosphatidyl inositol cleaving enzyme, e.g., phosphatidyl inositol phospholipase-C.
  • PI phosphatidyl inositol
  • a phosphatidyl inositol cleaving enzyme e.g., phosphatidyl inositol phospholipase-C.
  • IL-B50 fragments or derivatives thereof can be prepared by conventional processes for synthesizing peptides. These include processes such as are described in Stewart and Young (1984) Solid Phase Peptide Synthesis, Pierce Chemical Co., Rockford, IL; Bodanszky and Bodanszky (1984) The Practice of Peptide Synthesis, Springer- Verlag, New York; Bodanszky (1984) The Principles of Peptide Synthesis, Springer-Verlag, New York; and Villafranca (ed. 1991) Techniques in Protein Chemistry II, Academic Press, San Diego, Ca.
  • the present invention provides reagents which will find use in diagnostic applications as described elsewhere herein, e.g., in IL-B50 mediated conditions, or below in the description of kits for diagnosis.
  • the gene may be useful in forensic sciences, e.g., to distinguish rodent from human, or as a marker to distinguish between different cells exhibiting differential expression or modification patterns.
  • This invention also provides reagents with significant commercial and/or therapeutic potential.
  • the IL-B50 naturally occurring or recombinant
  • fragments thereof, and antibodies thereto, along with compounds identified as having binding affinity to IL-B50, should be useful as reagents for teaching techniques of molecular biology, immunology, or physiology.
  • Appropriate kits may be prepared with the reagents, e.g., in practical laboratory exercises in production or use of proteins, antibodies, cloning methods, histology, etc.
  • the reagents will also be useful in the treatment of conditions associated with abnormal physiology or development, including inflammatory conditions . They may be useful in vitro tests for presence or absence of interacting components, which may correlate with success of particular treatment strategies. In particular, modulation of physiology of various, e.g., hematopoietic or lymphoid, cells will be achieved by appropriate methods for treatment using the compositions provided herein. See, e.g., Thomson (ed. 1998) The Cytokine Handbook (3d ed.) Academic Press, San Diego; Metcalf and Nicola (1995) The Hematopoietic Colony Stimulating Factors Cambridge University Press; and Aggarwal and Gutterman (1991) Human Cytokines Blackwell Pub.
  • a disease or disorder associated with abnormal expression or abnormal signaling by an IL-B50 should be a likely target for an agonist or antagonist.
  • the new cytokine should play a role in regulation or development of hematopoietic cells, e.g., lymphoid cells, which affect immunological responses, e.g., inflammation and/or autoimmune disorders. Alternatively, it may affect vascular physiology or development, or neuronal effects.
  • the cytokine should mediate, in various contexts, cytokine synthesis by the cells, proliferation, etc.
  • Antagonists of IL-B50 may provide a selective and powerful way to block immune responses, e.g., in situations as inflammatory or autoimmune responses. See also Samter, et al . (eds.) Immunological Diseases vols. 1 and 2, Little, Brown and Co. Various abnormal conditions are known in different cell types which will produce IL-B50, e.g., as evaluated by mRNA expression by Northern blot analysis. See Berkow (ed.) The Merck Manual of Diagnosis and Therapy, Merck & Co., Rahway, N.J. ; Thorn, et al . Harrison's Principles of Internal
  • IL-B50 antagonists, antibodies, etc.
  • reagents can be combined for therapeutic use with additional active or inert ingredients, e.g., in conventional pharmaceutically acceptable carriers or diluents, e.g., immunogenic adjuvants, along with physiologically innocuous stabilizers, excipients, or preservatives.
  • additional active or inert ingredients e.g., in conventional pharmaceutically acceptable carriers or diluents, e.g., immunogenic adjuvants, along with physiologically innocuous stabilizers, excipients, or preservatives.
  • These combinations can be sterile filtered and placed into dosage forms as by lyophilization in dosage vials or storage in stabilized aqueous preparations.
  • This invention also contemplates use of antibodies or binding fragments thereof, including forms which are not complement binding.
  • Drug screening using IL-B50 or fragments thereof can be performed to identify compounds having binding affinity to or other relevant biological effects on IL-B50 functions, including isolation of associated components . Subsequent biological assays can then be utilized to determine if the compound has intrinsic stimulating activity and is therefore a blocker or antagonist in that it blocks the activity of the cytokine. Likewise, a compound having intrinsic stimulating activity can activate the signal pathway and is thus an agonist in that it simulates the activity of IL-B50. This invention further contemplates the therapeutic use of blocking antibodies to IL-B50 as antagonists and of stimulatory antibodies as agonists. This approach should be particularly useful with other IL-B50 species variants .
  • reagents necessary for effective therapy will depend upon many different factors, including means of administration, target site, physiological state of the patient, and other medicants administered. Thus, treatment dosages should be titrated to optimize safety and efficacy. Typically, dosages used in vitro may provide useful guidance in the amounts useful for in situ administration of these reagents. Animal testing of effective doses for treatment of particular disorders will provide further predictive indication of human dosage. Various considerations are described, e.g., in Gilman, et al . (eds.) Goodman and
  • Dosage ranges would ordinarily be expected to be in amounts lower than 1 mM concentrations, typically less than about 10 ⁇ M concentrations, usually less than about 100 nM, preferably less than about 10 pM (picomolar) , and most preferably less than about 1 fM (femtomolar) , with an appropriate carrier.
  • Slow release formulations, or a slow release apparatus will often be utilized for continuous or long term administration. See, e.g., Langer (1990) Science 249:1527-1533.
  • IL-B50 fragments thereof, and antibodies to it or its fragments, antagonists, and agonists, may be administered directly to the host to be treated or, depending on the size of the compounds, it may be desirable to conjugate them to carrier proteins such as ovalbumin or serum albumin prior to their administration.
  • Therapeutic formulations may be administered in many conventional dosage formulations. While it is possible for the active ingredient to be administered alone, it is preferable to present it as a pharmaceutical formulation.
  • Formulations typically comprise at least one active ingredient, as defined above, together with one or more acceptable carriers thereof . Each carrier should be both pharmaceutically and physiologically acceptable in the sense of being compatible with the other ingredients and not injurious to the patient.
  • Formulations include those suitable for oral, rectal, nasal, topical, or parenteral (including subcutaneous, intramuscular, intravenous and intradermal) administration.
  • the formulations may conveniently be presented in unit dosage form and may be prepared by any methods well known in the art of pharmacy. See, e.g., Gilman, et al . (eds. 1990) Goodman and Gilman's: The Pharmacological Bases of Therapeutics, 8th Ed., Pergamon Press; and Remington's Pharmaceutical Sciences, 17th ed. (1990), Mack Publishing Co., Easton, Penn.; Avis, et al . (eds. 1993) Pharmaceutical Dosage Forms: Parenteral Medications, Dekker, New York; Lieberman, et al .
  • compositions Tablets, Dekker, New York; and Lieberman, et al . (eds. 1990) Pharmaceutical Dosage Forms: Disperse Systems, Dekker, New York.
  • the therapy of this invention may be combined with or used in association with other agents, e.g., other cytokines, including IL-7, or its antagonists.
  • IL- B50s of this invention are particularly useful in kits and assay methods which are capable of screening compounds for binding activity to the proteins.
  • Several methods of automating assays have been developed in recent years so as ' to permit screening of tens of thousands of compounds in a short period. See, e.g., Fodor, et al . (1991) Science 251:767-773, which describes means for testing of binding affinity by a plurality of defined polymers synthesized on a solid substrate.
  • suitable assays can be greatly facilitated by the availability of large amounts of purified, soluble IL-B50 as provided by this invention.
  • Helix A would run (SEQ ID NO: 4) in the human from about lys10 to tyr26, helix B would run from about his46 to asn57; helix C would run from about glu68 to trp81; and helix D would run from about asnl07 to position about leul27.
  • Surface exposed residues would affect receptor binding, while embedded residues would affect general structure.
  • antagonists can normally be found once the antigen has been structurally defined, e.g., by tertiary structure data. Testing of potential interacting analogs is now possible upon the development of highly automated assay methods using a purified IL-B50. In particular, new agonists and antagonists will be discovered by using screening techniques described herein. Of particular importance are compounds found to have a combined binding affinity for a spectrum of IL-B50 molecules, e.g., compounds which can serve as antagonists for species variants of IL-B50.
  • One method of drug screening utilizes eukaryotic or prokaryotic host cells which are stably transformed with recombinant DNA molecules expressing an IL-B50.
  • Cells may be isolated which express an IL-B50 in isolation from other molecules.
  • Such cells either in viable or fixed form, can be used for standard binding partner binding assays. See also, Parce, et al . (1989) Science 246:243-247; and Owicki, et al .
  • Rational drug design may also be based upon structural studies of the molecular shapes of the IL-B50 and other effectors or analogs .
  • Effectors may be other proteins which mediate other functions in response to binding, or other proteins which normally interact with IL-B50, e.g., a receptor.
  • One means for determining which sites interact with specific other proteins is a physical structure determination, e.g., x-ray crystallography or 2 dimensional NMR techniques. These will provide guidance as to which amino acid residues form molecular contact regions, as modeled, e.g., against other cytokine-receptor models.
  • protein structural determination see, e.g., Blundell and Johnson (1976) Protein Crystallography, Academic Press, New York.
  • kits and methods for detecting the presence of another IL-B50 or binding partner will have a compartment containing either a defined IL-B50 peptide or gene segment or a reagent which recognizes one or the other, e.g., IL-B50 fragments or antibodies.
  • a kit for determining the binding affinity of a test compound to an IL-B50 would typically comprise a test compound; a labeled compound, for example a binding partner or antibody having known binding affinity for IL-B50; a source of IL-B50 (naturally occurring or recombinant); and a means for separating bound from free labeled compound, such as a solid phase for immobilizing the molecule.
  • a test compound for example a binding partner or antibody having known binding affinity for IL-B50
  • a source of IL-B50 naturally occurring or recombinant
  • a means for separating bound from free labeled compound such as a solid phase for immobilizing the molecule.
  • a preferred kit for determining the concentration of, e.g., an IL-B50 in a sample would typically comprise a labeled compound, e.g., binding partner or antibody, having known binding affinity for the antigen, a source of cytokine (naturally occurring or recombinant) and a means for separating the bound from free labeled compound, e.g., a solid phase for immobilizing the IL-B50. Compartments containing reagents, and instructions, will normally be provided.
  • Antibodies including antigen binding fragments, specific for the IL-B50 or fragments are useful in diagnostic applications to detect the presence of elevated levels of IL- B50 and/or its fragments.
  • diagnostic assays can employ lysates, live cells, fixed cells, immunofluorescence, cell cultures, body fluids, and further can involve the detection of antigens related to the antigen in serum, or the like. Diagnostic assays may be homogeneous (without a separation step between free reagent and antigen-binding partner complex) or heterogeneous (with a separation step) .
  • RIA radioimmunoassay
  • ELISA enzyme-linked immunosorbent assay
  • EIA enzyme immunoassay
  • EMIT enzyme- multiplied immunoassay technique
  • SFIA substrate-labeled fluorescent immunoassay
  • Anti-idiotypic antibodies may have similar use to diagnose presence of antibodies against an IL-B50, as such may be diagnostic of various abnormal states. For example, overproduction of IL-B50 may result in production of various immunological reactions which may be diagnostic of abnormal physiological states, particularly in proliferative cell conditions such as cancer or abnormal activation or differentiation. Moreover, the distribution pattern available provides information that the cytokine is expressed in pancreatic islets, suggesting the possibility that the cytokine may be involved in function of that organ, e.g., in a diabetes relevant medical condition.
  • the reagents for diagnostic assays are supplied in kits, so as to optimize the sensitivity of the assay.
  • the protocol, and the label either labeled or unlabeled antibody or binding partner, or labeled IL-B50 is provided. This is usually in conjunction with other additives, such as buffers, stabilizers, materials necessary for signal production such as substrates for enzymes, and the like.
  • the kit will also contain instructions for proper use and disposal of the contents after use.
  • the kit has compartments for each useful reagent.
  • the reagents are provided as a dry lyophilized powder, where the reagents may be reconstituted in an aqueous medium providing appropriate concentrations of reagents for performing the assay.
  • labeling may be achieved by covalently or non- covalently joining a moiety which directly or indirectly provides a detectable signal.
  • the binding partner, test compound, IL-B50, or antibodies thereto can be labeled either directly or indirectly.
  • Possibilities for direct labeling include label groups : radiolabels such as 125 I, enzymes (U.S. Pat. No. 3,645,090) such as peroxidase and alkaline phosphatase, and fluorescent labels (U.S. Pat. No. 3,940,475) capable of monitoring the change in fluorescence intensity, wavelength shift, or fluorescence polarization.
  • Possibilities for indirect labeling include biotinylation of one constituent followed by binding to avidin coupled to one of the above label groups .
  • the IL-B50 can be immobilized on various matrixes followed by washing. Suitable matrixes include plastic such as an ELISA plate, filters, and beads. See, e.g., Coligan, et al. (eds. 1993) Current Protocols in Immunology, Vol. 1, Chapter 2, Greene and Wiley, NY.
  • suitable separation techniques include, without limitation, the fluorescein antibody magnetizable particle method described in Rattle, et al . (1984) Clin. Chem. 30:1457-1461, and the double antibody magnetic particle separation as described in U.S. Pat. No. 4,659,678.
  • Another diagnostic aspect of this invention involves use of oligonucleotide or polynucleotide sequences taken from the sequence of an IL-B50. These sequences can be used as probes for detecting levels of the IL-B50 message in samples from patients suspected of having an abnormal condition, e.g., inflammatory or autoimmune . Since the cytokine may be a marker or mediator for activation, it may be useful to determine the numbers of activated cells to determine, e.g., when additional therapy may be called for, e.g., in a preventative fashion before the effects become and progress to significance.
  • kits which also test for the qualitative or quantitative expression of other molecules are also contemplated. Diagnosis or prognosis may depend on the combination of multiple indications used as markers. Thus, kits may test for combinations of markers. See, e.g., Viallet, et al . (1989) Progress in Growth Factor Res. 1:89-97. Other kits may be used to evaluate other cell subsets.
  • IL-B50 cytokine without interfering with the binding to its receptor can be determined.
  • an affinity label can be fused to either the amino- or carboxyl-terminus of the ligand.
  • Such label may be a FLAG epitope tag, or, e.g., an Ig or Fc domain.
  • An expression library can be screened for specific binding of the cytokine, e.g., by cell sorting, or other screening to detect subpopulations which express such a binding component.
  • a panning method may be used. See, e.g., Seed and Aruffo (1987) Proc. Nat ' 1 Acad. Sci. USA 84:3365-3369.
  • Protein cross-linking techniques with label can be applied to isolate binding partners of the IL-B50 cytokine. This would allow identification of proteins which specifically interact with the cytokine, e.g., in a ligand-receptor like manner. It is predicted that the IL-B50 will bind to the IL- 7R alpha subunit, but this is likely to the beta subunit in the IL-B50 receptor. Thus, another subunit would serve as the alpha receptor subunit for the IL-B50.
  • Methods for protein purification include such methods as ammonium sulfate precipitation, column chromatography, electrophoresis, centrifugation, crystallization, and others. See, e.g.,
  • Combination with recombinant techniques allow fusion to appropriate segments (epitope tags), e.g., to a FLAG sequence or an equivalent which can be fused, e.g., via a protease-removable sequence.
  • appropriate segments e.g., to a FLAG sequence or an equivalent which can be fused, e.g., via a protease-removable sequence.
  • Assays for vascular biological activities are well known in the art . They will cover angiogenic and angiostatic activities in tumor, or other tissues, e.g., arterial smooth muscle proliferation (see, e.g., Koyoma, et al . (1996) Cell 87:1069-1078), monocyte adhesion to vascular epithelium (see McEvoy, et al . (1997) J. Exp. Med. 185:2069-2077), etc.
  • the sequence of the gene is provided in Table 1.
  • the sequence is derived from a cDNA library made from testes .
  • the sequence is quite rare, not being found with frequency in available sequence databases .
  • This sequence allows preparation of PCR primers, or probes, to determine cellular distribution of the gene.
  • the sequence allows isolation of genomic DNA which encode the message.
  • PCR products are cloned using, e.g., a TA cloning kit (Invitrogen) .
  • the resulting cDNA plasmids are sequenced from both termini on an automated sequencer (Applied Biosystems) .
  • probes specific for cDNA encoding primate IL-B50 are prepared. Typically, the probe is labeled, e.g., by random priming .
  • Southern Analysis DNA (5 ⁇ g) from a primary amplified cDNA library was digested with appropriate restriction enzymes to release the inserts, run on a 1% agarose gel and transferred to a nylon membrane (Schleicher and Schuell, Keene, NH) .
  • Samples for human mRNA isolation may include: peripheral blood mononuclear cells (monocytes, T cells, NK cells, granulocytes, B cells), resting (T100); peripheral blood mononuclear cells, activated with anti-CD3 for 2, 6, 12 h pooled (T101) ; T cell, THO clone Mot 72, resting (T102); T cell, THO clone Mot 72, activated with anti-CD28 and anti-CD3 for 3, 6, 12 h pooled (T103); T cell, THO clone Mot 72, anergic treated with specific peptide for 2, 7, 12 h pooled (T104); T cell, TH1 clone HY06, resting (T107); T cell, TH1 clone HY06, activated with anti-CD28 and anti-CD3 for 3, 6, 12 h pooled (T108) ; T cell, TH1 clone HY06, anergic treated with specific peptide for
  • Samples for mouse mRNA isolation can include: resting mouse fibroblastic L cell line (C200); Braf:ER (Braf fusion to estrogen receptor) transfected cells, control (C201); Mell4+ naive T cells from spleen, resting (T209); Mell4+ naive T cells from spleen, stimulated with IFN ⁇ , IL-12, and anti IL-4 to polarize to THl cells, exposed to IFN ⁇ and IL-4 for 6, 12, 24 h, pooled (T210); Mell4+ naive T cells from spleen, stimulated with IL-4 and anti IFN ⁇ to polarize to Th2 cells, exposed to IL-4 and anti IFN ⁇ for 6, 13, 24 h, pooled (T211); T cells, THl polarized (Mell4 bright, CD4+ cells from spleen, polarized for 7 days with IFN- ⁇ and anti IL-4; T
  • T cells highly TH2 polarized 3x from transgenic Balb/C (activated with anti-CD3 for 2, 6, 24 h pooled (T203); T cells, highly THl polarized 3x from transgenic C57 bl/6 (activated with anti-CD3 for 2, 6, 24 h pooled; T212); T cells, highly TH2 polarized 3x from transgenic C57 bl/6 (activated with anti-CD3 for 2, 6, 24 h pooled; T213); T cells, highly THl polarized (naive CD4+ T cells from transgenic Balb/C, polarized 3x with IFN ⁇ , IL-12, and anti-IL- 4; stimulated with IGIF, IL-12, and anti IL-4 for 6, 12, 24 h, pooled); CD44- CD25+ pre T cells, sorted from th
  • Chromosome mapping is a standard technique. See, e.g., BIOS Laboratories (New Haven, CT) and methods for using a mouse somatic cell hybrid panel with PCR.
  • Natural IL-B50 can be isolated from natural sources, or by expression from a transformed cell using an appropriate expression vector. Higher efficiency of secretion has been achieved by use of a heterologous signal sequence. Purification of the expressed protein is achieved by standard procedures, or may be combined with engineered means for effective purification at high efficiency from cell lysates or supernatants . FLAG or His6 segments can be used for such purification features. Alternatively, affinity chromatography may be used with specific antibodies, see below.
  • Protein is produced in coli, insect cell, or mammalian expression systems, as desired.
  • the IL-B50 cDNA can be used as a hybridization probe to screen a library from a desired source, e.g., a primate cell cDNA library. Many different species can be screened both for stringency necessary for easy hybridization, and for presence using a probe. Appropriate hybridization conditions will be used to select for clones exhibiting specificity of cross hybridization.
  • Species variants are isolated using cross-species hybridization techniques based upon isolation of a full length isolate or fragment from one species as a probe.
  • antibodies raised against human IL-B50 will be used to screen for cells which express cross-reactive proteins from an appropriate, e.g., cDNA library.
  • the purified protein or defined peptides are useful for generating antibodies by standard methods, as described above.
  • Synthetic peptides or purified protein are presented to an immune system to generate monoclonal or polyclonal antibodies. See, e.g., Coligan (1991) Current Protocols in Immunology Wiley/Greene; and Harlow and Lane (1989) Antibodies : A Laboratory Manual Cold Spring Harbor Press.
  • the resulting antibodies are used for screening, purification, or diagnosis, as described.
  • Synthetic peptides or purified protein are presented to an immune system to generate monoclonal or polyclonal antibodies. See, e.g., Coligan (1991) Current Protocols in Immunology Wiley/Greene; and Harlow and Lane (1989) Antibodies: A Laboratory Manual Cold Spring Harbor Press. Polyclonal serum, or hybridomas may be prepared. In appropriate situations, the binding reagent is either labeled as described above, e.g., fluorescence or otherwise, or immobilized to a substrate for panning methods. Immunoselection, absorptions, depletions, and related techniques are available to prepare selective reagents, e.g., exhibiting the desired spectrum of selectivity for binding.
  • the effect on proliferation or differentiation of various cell types are evaluated with various concentrations of cytokine.
  • a dose response analysis is performed, in certain cases in combination with the related cytokine IL-7 and/or stem cell factor.
  • IL-7 exhibits strong effects on lymphopoietic development and differentiation.
  • the IL-B50 will be tested on cord blood cells to see if it has effects on proliferation or differentiation of early progenitor cells derived therefrom.
  • the cells are early precursor cells, e.g., stem cells, originating from, e.g., cord blood, bone marrow, thymus, spleen, or CD34+ progenitor cells. See, e.g., Eddington and Lotze (1998).
  • PBMC peripheral blood mononuclear cells
  • PBMC Total PBMC are isolated from buffy coats of normal healthy donors by centrifugation through ficoll-hypaque as described (Boyum, et al . ) .
  • PBMC are cultured in 200 ⁇ l Yssel's medium (Gemini Bioproducts, Calabasas, CA) containing 1% human AB serum in 96 well plates (Falcon, Becton-Dickinson, NJ) in the absence or presence of IL-B50.
  • Cells are cultured in medium alone or in combination with 100 U/ml IL-2 (R&D Systems) for 120 hours.
  • 3H-Thymidine (0.1 mCi) is added during the last six hours of culture and 3H-Thymidine incorporation determined by liquid scintillation counting.
  • the native, recombinant, and fusion proteins would be tested for agonist and antagonist activity in many other biological assay systems, e.g., on T-cells, B-cells, NK, macrophages, dendritic cells, hematopoietic progenitors, etc.
  • IL-B50 is evaluated for agonist or antagonist activity on transfected cells expressing IL-7 receptor and controls.
  • IL-B50 is evaluated for effect in macrophage/dendritic cell activation and antigen presentation assays, T cell cytokine production and proliferation in response to antigen or allogeneic stimulus.
  • IL-B50 will also be evaluated for effects on NK cell stimulation.
  • Assays may be based, e.g., on Hsu, et al . (1992) Internat . Immunol . 4:563-569; and Schwarz, et al . (1994) J. Immunother . 16:95-104.
  • Other assays are applied to evaluate effects on cytotoxic T cells and LAK cells. See, e.g., Namien and Mire-Sluis (1998) .
  • B cell growth and differentiation effects will be analyzed, e.g., by the methodology described, e.g., in
  • Monocytes are purified by negative selection from peripheral blood mononuclear cells of normal healthy donors.
  • 3 x 10 ⁇ ficoll banded mononuclear cells are incubated on ice with a cocktail of monoclonal antibodies (Becton- Dickinson; Mountain View, CA) consisting, e.g., of 200 ⁇ l of ⁇ CD2 (Leu-5A) , 200 ⁇ l of ⁇ CD3 (Leu-4), 100 ⁇ l of ⁇ CD8 (Leu 2a), 100 ⁇ l of ⁇ CD19 (Leu-12 ), 100 ⁇ l of ⁇ CD20 (Leu-16), 100 ⁇ l of ⁇ CD56 (Leu-19), 100 ⁇ l of ⁇ CD67 (IOM 67; Immunotech, Westbrook, ME), and anti-glycophorin antibody (10F7MN, ATCC, Rockville, MD) .
  • a cocktail of monoclonal antibodies consisting, e.g., of 200 ⁇ l of ⁇ CD2 (Leu-5A) , 200 ⁇ l of ⁇ CD3 (Leu-4), 100 ⁇ l of
  • Antibody bound cells are washed and then incubated with sheep anti-mouse IgG coupled magnetic beads (Dynal, Oslo, Norway) at a bead to cell ratio of 20:1. Antibody bound cells are separated from monocytes by application of a magnetic field. Subsequently, human monocytes are cultured in Yssel's medium (Gemini Bioproducts, Calabasas, CA) containing 1% human AB serum in the absence or presence of IL-B50, IL-6, G-CSF or combinations.
  • Analyses of the expression of cell surface molecules can be performed by direct immunofluorescence. For example, 2 x 10 ⁇ purified human monocytes are incubated in phosphate buffered saline (PBS) containing 1% human serum on ice for 20 minutes. Cells are pelleted at 200 x g. Cells are resuspended in 20 ml PE or FITC labeled mAb. Following an additional 20 minute incubation on ice, cells are washed in PBS containing 1% human serum followed by two washes in PBS alone. Cells are fixed in PBS containing 1% paraformaldehyde and analyzed on FACScan flow cytometer (Becton Dickinson; Mountain View, CA) .
  • PBS phosphate buffered saline
  • Exemplary mAbs are used, e.g.: CDllb (anti-macl), CDllc (a gpl50/95) , CD14 (Leu-M3), CD54 (Leu 54), CD80 (anti-BBl/B7) , HLA-DR (L243) from Becton-Dickinson and CD86 (FUN 1; Pharmingen) , CD64 (32.2; Medarex) , CD40 (mAb89; Schering-Plough France) .
  • CDllb anti-macl
  • CDllc a gpl50/95
  • CD14 Leu-M3
  • CD54 Leu 54
  • CD80 anti-BBl/B7
  • HLA-DR L243
  • CD64 32.2; Medarex
  • CD40 mAb89; Schering-Plough France
  • Human monocytes are isolated as described and cultured in
  • Yssel's medium (Gemini Bioproducts, Calabasas, CA) containing
  • IL-B50 (1/100 dilution baculovirus expressed material) .
  • monocytes are stimulated with LPS (E. coli 0127 :B8 Difco) in the absence or presence of IL-B50 and the concentration of cytokines (IL-l ⁇ , IL-6, TNF ⁇ , GM-CSF, and IL-10) in the cell culture supernatant determined by ELISA.
  • LPS E. coli 0127 :B8 Difco
  • cytokines IL-l ⁇ , IL-6, TNF ⁇ , GM-CSF, and IL-10
  • monocytes are cultured (1 million/ml) in Yssel's medium in the absence or presence of IL-B50 and LPS (E. coli 0127 :B8 Difco) and 10 mg/ml Brefeldin A (Epicentre technologies Madison WI) for 12 hrs.
  • Cells are washed in PBS and incubated in 2% formaldehyde/PBS solution for 20 minutes at RT.
  • cells are washed, resuspended in permeabilization buffer (0.5% saponin (Sigma) in PBS/BSA (0.5%) /Azide (1 mM) ) and incubated for 20 minutes at RT.
  • Cells (2 x 10 5 ) are centrifuged and resuspended in 20 ml directly conjugated anti-cytokine mAbs diluted 1:10 in permeabilization buffer for 20 minutes at RT.
  • the following antibodies can be used: IL-l ⁇ -PE (364-3B3-14) ; IL-6-PE (MQ2-13A5); TNF ⁇ -PE (MAbll); GM-CSF-PE (BVD2-21C11) ; and IL-12-PE (Cll.5.14; Pharmingen San Diego, CA) .
  • IL-l ⁇ -PE 364-3B3-14
  • IL-6-PE MQ2-13A5
  • TNF ⁇ -PE MAbll
  • GM-CSF-PE GM-CSF-PE
  • IL-12-PE Cll.5.14; Pharmingen San Diego, CA
  • Such animals are useful to determine the effects of deletion of the gene, in specific tissues, or completely throughout the organism. Such may provide interesting insight into development of the animal or particular tissues in various stages. Moreover, the effect on various responses to biological stress can be evaluated. See, e.g., Hogan, et al . (1995) Manipulating the Mouse Embryo: A Laboratory Manual (2d ed.) Cold Spring Harbor Laboratory Press.

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