US20180364230A1 - DETECTION OF ANTI-p53 ANTIBODIES - Google Patents

DETECTION OF ANTI-p53 ANTIBODIES Download PDF

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US20180364230A1
US20180364230A1 US16/111,347 US201816111347A US2018364230A1 US 20180364230 A1 US20180364230 A1 US 20180364230A1 US 201816111347 A US201816111347 A US 201816111347A US 2018364230 A1 US2018364230 A1 US 2018364230A1
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antigen
detection
seq
antibody
capture
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Herbert Andres
Johann Karl
Ursula Kunert
David Morgenstern
Nina Meissler
Marion Niessner
Magdalena Swiatek-de Lange
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Roche Diagnostics Operations Inc
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Roche Diagnostics Operations Inc
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Assigned to ROCHE DIAGNOSTICS OPERATIONS, INC. reassignment ROCHE DIAGNOSTICS OPERATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MORGENSTERN, DAVID
Assigned to ROCHE DIAGNOSTICS OPERATIONS, INC. reassignment ROCHE DIAGNOSTICS OPERATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROCHE DIAGNOSTICS GMBH
Publication of US20180364230A1 publication Critical patent/US20180364230A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54306—Solid-phase reaction mechanisms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/564—Immunoassay; Biospecific binding assay; Materials therefor for pre-existing immune complex or autoimmune disease, i.e. systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, rheumatoid factors or complement components C1-C9
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/46—Hybrid immunoglobulins
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/5748—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving oncogenic proteins
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/57484—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites
    • G01N33/57496—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites involving intracellular compounds
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/58—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving labelled substances
    • G01N33/582—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving labelled substances with fluorescent label
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
    • G01N33/6854—Immunoglobulins
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
    • G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
    • G01N2333/46—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans from vertebrates
    • G01N2333/47—Assays involving proteins of known structure or function as defined in the subgroups
    • G01N2333/4701—Details
    • G01N2333/4748—Details p53

Definitions

  • the present disclosure relates to a method for the detection of antibodies against p53 (anti-p53 antibodies).
  • the method disclosed enables the detection of anti-p53 antibodies with higher specificity as compared to state of the art methods.
  • the method according to the present disclosure requires a p53 capture antigen and a p53 detection antigen.
  • the method comprises incubating a p53 capture antigen and a p53 detection antigen with a sample known or suspected to comprise an anti-p53 antibody, whereby a complex comprising the p53 capture antigen the anti-p53 antibody and the p53 detection antigen is formed, separating the complex formed from unbound detection antigen, measuring the complex obtained via the detection antigen comprised therein and thereby detecting the anti-p53 antibody comprised in the sample.
  • Anti-p53 antibodies (anti-p53 Abs) were discovered more than 30 years ago during the course of tumor-associated antigen screening, Crawford L. V. et al., Int. J. Cancer, 30: 403-408, 1982. However, this study as well as a few similar ones, performed in the early 1980s, were virtually ignored for more than 10 years because of a lack of interest in p53 during that period.
  • the tumor suppressor p53 is a phosphoprotein barely detectable in the nucleus of normal cells (Benchimol, S. et al., EMBO J. 1 (1982) 1055-1062). On cellular stress, particularly that induced by DNA damage, p53 can arrest cell cycle progression, thus allowing the DNA to be repaired or it can lead to apoptosis. In cancer cells that bear a mutant p53, this protein is no longer able to control cell proliferation, which results in inefficient DNA repair (Levine, A. Cell 88 (1997) 323-331). The most common changes of p53 in human cancer are point missense mutations, which are found in cancers of the colon, stomach, breast, lung, brain and esophagus (Greenblatt, M.
  • CRC is the third most common cancer in men worldwide and represents 10.0% of the total cancers among male patients.
  • CRC is also the second most common in women across the world with 614,000 new cases each year, representing 9.2% of cancers affecting female patients.
  • Oesophageal cancer is the sixth most common cause of death from cancer and has an estimated incidence of 456,000 new cases among men and women representing 3.2% of the total new cancers each year.
  • Breast Cancer is by far the most frequent cancer among women with an estimated 1.67 million new cancer cases diagnosed worldwide in 2012 representing 25% of all cancers in female patients. Overall, Breast cancer is the second most common cancer in the world.
  • auto- anti-p53
  • Antibodies of the IgM class of antibodies in general are more sticky and lead to further complications, e.g. further cross-reactivity and non-specific binding. For this reason anti-p53 detection methods in most cases rely on anti-human IgG detection reagents, i.e. the detection of only the human (auto-) antibodies of the immunoglobulin G class and not those of the immunoglobulin M class. As further evidenced by the way the Mesacup assay has to be performed, non-specific binding most likely is a key problem for any method used in the detection of anti-p53 antibodies.
  • an in vitro method for detecting an antibody to p53 (anti-p53 antibody) in a sample comprising: a) incubating a sample to be analyzed with a p53 capture antigen and a p53 detection antigen, whereby a complex comprising the p53 capture antigen, the anti-p53 antibody and the p53 detection antigen is formed, b) separating the complex formed in (a) from unbound detection antigen, c) measuring the complex obtained in step (b) via the detection antigen comprised therein, thereby detecting the anti-p53 antibody comprised in the sample.
  • Further and more detailed embodiments relate, e.g., to specific partial sequences of p53 for use in a method according to the present disclosure.
  • FIG. 1 Assay principle of Elecsys anti-p53 assay
  • FIG. 2 ROC-Blots
  • the present disclosure relates to an in vitro method for detecting an antibody to p53 (anti-p53 antibody) in a sample, the method comprising: a) incubating a sample to be analyzed with a p53 capture antigen and a p53 detection antigen, whereby a complex comprising the p53 capture antigen, the anti-p53 antibody and the p53 detection antigen is formed, b) separating the complex formed in (a) from unbound detection antigen, c) measuring the complex obtained in step (b) via the detection antigen comprised therein, thereby detecting the anti-p53 antibody comprised in the sample.
  • anti-p53 (auto-) antibody is an antibody that binds to the p53 polypeptide of SEQ ID NO: 3 or to a partial sequence thereof.
  • the method according to the present invention requires the use of both, a p53 capture antigen and of a p53 detection antigen, respectively.
  • An antibody to p53 present in a sample to be investigated binds to both these antigens, thereby forming a complex comprising the p53 capture antigen, the anti-p53 antibody and the p53 detection antigen.
  • capture antigen is familiar to a person skilled in the art.
  • the p53 capture antigen is capable of binding to a solid phase.
  • Solid phase Materials for manufacturing a solid phase (solid support) are well-known in the art. and include, inter alia, commercially available column materials, polystyrene beads, latex beads, magnetic beads, colloid metal particles, glass and/or silicon chips and surfaces, nitrocellulose strips, membranes, sheets, duracytes, wells and walls of reaction trays, wells and walls of reaction vessels, plastic tubes etc.
  • the solid phase is represented by the wells and walls of a microtitre plate.
  • the solid phase is in the form of particles.
  • the particle may be a microparticle which is or which comprises magnetic or ferromagnetic metals, alloys or compositions.
  • the solid phase material may have specific properties and e.g. be hydrophobic, or hydrophilic.
  • the microparticles are paramagnetic microparticles and the separation of such particles in the measurement method according to the present disclosure is facilitated by magnetic forces. Magnetic forces are applied to pull the paramagnetic or magnetic particles out of the solution/suspension and to retain them as desired while liquid of the solution/suspension can be removed and the particles can e.g. be washed.
  • the p53 capture antigen is capable of binding to a solid phase.
  • the capture antigen In order for the capture antigen to be capable of binding to a solid phase it is preferred to employ a specific binding pair. One partner of such binding pair is bound to the capture antigen and the other partner of such binding pair is bound to the solid phase.
  • binding pair as used herein consists of two partners binding to each other with high affinity, i.e. with one nanomolar affinity or better.
  • Embodiments for binding pairs are for example the binding pairs consisting of receptor and ligand, antigen and antibody, hapten and anti-hapten antibody, and binding pairs based on naturally occurring high affinity binding pairs.
  • receptor-ligand binding pair is a pair consisting of a steroid hormone receptor and the corresponding steroid hormone.
  • a binding pair which is suitable for the method according to the present invention is a hapten and anti-hapten antibody binding pair.
  • a hapten is an organic molecule with a molecular weight of 100 to 2000 Dalton, preferably of 150 to 1000 Dalton. Such small molecule which if used as such is non-immunogenic but can be rendered immunogenic by coupling it to a carrier molecule and anti-hapten antibodies can be generated according to standard procedures.
  • the hapten may be selected from the group comprising sterols, bile acids, sexual hormones, corticoids, cardenolides, cardenolide-glycosides, bufadienolides, steroid-sapogenines and steroid alkaloids, cardenolides and cardenolide-glycosides.
  • Representatives of these substance classes are digoxigenin, digitoxigenin, gitoxigenin, strophanthidin, digoxin, digitoxin, ditoxin, strophanthin.
  • Another suitable hapten is for example fluorescein.
  • binding pairs based on naturally occurring high affinity binding pairs are biotin or biotin analogues such as aminobiotin, iminobiotin or desthiobiotin and avidin or streptavidin as well as the FimG and DsF binding pair.
  • biotin-(strept)avidin binding pair is well-known in the art.
  • the basic principles of the FimG-DsF binding pair are e.g. described in WO2012/028697.
  • the p53 capture antigen is covalently bound to a first partner of a binding pair and the second partner of said binding pair is bound to the solid phase.
  • the first partner of the binding pair is selected from hapten, biotin or a biotin analogue such as aminobiotin, iminobiotin or desthiobiotin, DsF and the ligand for a receptor and the second partner of said binding pair is selected from anti-hapten antibody, avidin or streptavidin, FimG and a ligand-receptor.
  • first partner of the binding pair is selected from hapten, biotin or a biotin analogue such as aminobiotin, iminobiotin or desthiobiotin and DsF, and the second partner of said binding pair is selected from anti-hapten antibody, avidin or streptavidin and FimG.
  • first partner of the binding pair is selected from biotin or a biotin analogue, such as aminobiotin, iminobiotin or desthiobiotin, and DsF, and the second partner of said binding pair is selected from, avidin or streptavidin and FimG.
  • first partner of the binding pair is biotin or a biotin analogue such as aminobiotin, iminobiotin or desthiobiotin and the second partner of said binding pair is selected from avidin or streptavidin.
  • first partner of the binding pair is biotin and the second partner of said binding pair is streptavidin.
  • the method according to the present invention is practiced with a p53 capture antigen that is biotinylated and a solid phase that is coated with avidin or streptavidin.
  • the method according to the present invention is practiced with a p53 capture antigen that is bound to the solid phase.
  • Antibodies are at least bi-valent, i.e. having the potential to bind with one ‘arm’ to the capture antigen and with the other arm (or any of the other arms for multivalent antibodies) to the detection antigen.
  • An antibody to p53 present in a sample to be investigated binds to both these antigens, thereby forming a complex comprising the capture antigen, the anti-p53 antibody and the detection antigen.
  • detection antigen implies that this antigen can be detected. Such detection can be accomplished by various types of labels which are either directly or indirectly detactable.
  • the method according to the present disclosure is a method wherein the p53 detection antigen comprises a directly detectable label.
  • detectably labeled encompasses labels that can be directly or indirectly detected.
  • Directly detectable labels either provide a detectable signal or they interact with a second label to modify the detectable signal provided by the first or second label, e.g. to give FRET (fluorescence resonance energy transfer).
  • Labels such as fluorescent dyes and luminescent (including chemiluminescent and electrochemiluminescent) dyes (Briggs et al “Synthesis of Functionalised Fluorescent Dyes and Their Coupling to Amines and Amino Acids,” J. Chem. Soc., Perkin-Trans. 1 (1997) 1051-1058) provide a detectable signal and are generally applicable for labeling.
  • detectably labeled refers to a label providing or inducible to provide a detectable signal, i.e. to a luminescent label, to a fluorescent label, to a chemiluminescent label or to an electrochemiluminescent label, respectively.
  • the microparticle-based analyte-specific binding assay makes use of a chemiluminescent or an electrochemiluminescent label and a corresponding light detection system.
  • the light produced by the label is measured and directly or indirectly indicates the presence or quantity of the analyte.
  • Electrochemiluminescent (ECL) assays provide a sensitive and precise measurement of the presence and concentration of an analyte of interest. Such techniques use labels or other reactants that can be induced to luminesce when electrochemically oxidized or reduced in an appropriate chemical environment. Such electrochemiluminescense is triggered by a voltage imposed on a working electrode at a particular time and in a particular manner. The light produced by the label is measured and indicates the presence or quantity of the analyte.
  • ECL Electrochemiluminescent
  • the directly detectable label (used to label the detection antigen in a method of the present disclosure) is selected from the group consisting of a luminescent label, a fluorescent label, a chemiluminescent label or an electrochemiluminescent label.
  • the directly detectable label is a chemiluminescent or an electrochemiluminescent label.
  • the double-antigen sandwich assay according to the present disclosure uses the full length p53 polypeptide of SEQ ID NO:3 both as the capture as well as the detection antigen.
  • a synthetic peptide, representing at least one important epitope of p53 of the p53 polypeptide is of high utility in a method according to the present disclosure. Without wanting to be bound to theory, it may well be that such synthetic peptide sequence comprises an epitope that is bound by a significant percentage of those antibodies in a sample that also bind to the full-length p53 polypeptide. At the same time it may well be that those stretches of the p53 polypeptide that are rarely or not at all bound by an anti-p53 antibody (as e.g. comprised in a bodily fluid sample) are those sequence strechtes that significantly contribute to the non-specific binding of antibodies, especially of the sticky IgM-class antibodies.
  • the in vitro method for detection of anti-p53 antibodies according to the present invention is a double antigen sandwich immuno assay method wherein both the p53 capture antigen and the p53 detection antigen comprise a peptide of SEQ ID NO: 1.
  • the in vitro method for detection of anti-p53 antibodies according to the present invention is a double antigen sandwich immuno assay method wherein both the p53 capture antigen and the p53 detection antigen comprise a peptide of SEQ ID NO: 2.
  • the method for detection of anti-p53 antibodies according to the present invention is a double antigen sandwich immuno assay method wherein the peptides of SEQ ID NO:1 and of SEQ ID NO:2 are each comprised in both the p53 capture antigen and the p53 detection antigen.
  • the peptides representing the relevant partial sequences of the p53 polypeptide used in a method for detection of anti-p53 antibodies according to the present invention are the peptides consisting of SEQ ID NO:1 and of SEQ ID NO:2, respectively.
  • the method for detection of anti-p53 antibodies according to the present invention is a double antigen sandwich immuno assay method wherein the p53 detection antigen is a single polypeptide comprising both the peptides of SEQ ID NO:1 and of SEQ ID NO:2 at least twice.
  • the method for detection of anti-p53 antibodies according to the present invention is a double antigen sandwich immuno assay method wherein the p53 detection antigen comprises a fusion polypeptide comprising at least one multimerization domain, at least one polypeptide of SEQ ID NO: 1 and at least one polypeptide of SEQ ID NO:2, wherein the multimerization domain is a prokaryotic or eukaryotic chaperone selected from the group consisting of FkpA, Skp, SecB, Hsp25, MIP, GroEL, ClpB and ClpX.
  • the present disclosure relates to a fusion polypeptide comprising at least one multimerization domain, at least one polypeptide of SEQ ID NO:1 and at least one polypeptide of SEQ ID NO:2, wherein the multimerization domain is a prokaryotic or eukaryotic chaperone selected from the group consisting of FkpA, Skp, SecB, Hsp25, MIP, GroEL, ClpB and ClpX.
  • the multimerization domain is a prokaryotic or eukaryotic chaperone selected from the group consisting of FkpA, Skp, SecB, Hsp25, MIP, GroEL, ClpB and ClpX.
  • the multimerization domain is preferably located at the N- and/or C-terminus of the fusion polypeptide, more preferably at the N-terminus.
  • the multimerization domain is a polypeptide sequence which supports multimerization of individual fusion polypeptide molecules, wherein a multimer is formed which is comprised of a plurality of monomeric subunits, which are associated by non-covalent interactions.
  • the monomeric subunits of the complex are genetic fusion proteins, wherein the individual amino acid residues are linked by peptide bonds.
  • the monomeric subunits of the multimer are preferably identical.
  • the multimerization domain may be a dimerization domain, i.e. a domain which supports noncovalent association of two subunits, a trimerization domain, which supports non-covalent association of three subunits, a tetramerization domain or an even higher mukimerization domain.
  • the multimerization domain is a dimerization domain, a trimerization domain or a tetramerization domain.
  • Multimerization domains may be selected from prokaryotic or eukaryotic chaperones, preferably from ATPindependent chaperones.
  • Specific examples of multimerization domains are the proteins FkpA, Skp and SecB from E. coli or orthologs thereof from other prokaryotic organisms.
  • FkpA is an ATP-independent periplasmic dimerization chaperone from E. coli .
  • Skp is an ATP-independent periplasmic trimerization chaperone from E. coli .
  • SecB is an ATPindependent cytosolic tetramerization chaperone from E. coli .
  • Further suitable multimerization domains are heat shock proteins from eukaryotic or prokaryotic organisms, e.g.
  • Hsp25 an ATP-independent eukaryotic cytosolic/nuclear oligomeric chaperone.
  • a further suitable multimerization domain is MIP (macrophage infectivity potentiator), an ATP-independent dimerization chaperone which is structurally related with FkpA.
  • ATP-dependent chaperones like GroEL, an ATP-dependent cytosolic heptamerisation chaperone from E. coli or ClpB, an ATP-dependent hexamerization chaperone from E. coli or ClpX are also suitable.
  • the multimerization domains may be selected from fragments or variants of the above polypeptides, which retain their ability of multimer formation.
  • the individual polypeptide sequences of SEQ ID NO:1 and of SEQ ID NO:2, respectively, in the fusion polypeptide may be separated by spacer sequences.
  • the spacer sequences are preferably sequences which are heterologous to the p53.
  • the spacer sequences are selected from sequences which barely if at all interfere with the use of the fusion polypeptide as an antigen for determining anti-p53 antibodies. This means that the spacer sequences are not immunologically reactive against the antibodies to be tested.
  • the spacer sequences comprise glycine and/or serine residues.
  • the spacer is a poly-glycine spacer.
  • the length of the spacer sequence is preferably from 1-10 amino acids.
  • a spacer sequence may be present between the multimerization domain and the polypeptide of SEQ ID NO:1 and/or the polypeptide of SEQ ID NO:2.
  • This spacer sequence may have a length of e.g. 1-100 amino acids.
  • this spacer sequence is as described above.
  • the method according to the present disclosure is practiced with a p53 detection antigen comprising an indirectly detectable label.
  • Indirectly detectably labeled refers, e.g. to a detection antigen comprising a hapten and to the detection of such haptenylated compound by an anti-hapten antibody carrying a directly detectable label or to the a detection antigen comprising an enzyme and to the detection of such enzyme by its corresponding enzymatic activity resulting in the conversion of an appropriate dye substrate.
  • Various enzyme-substrate labels are available or disclosed (see e.g. U.S. Pat. No. 4,275,149).
  • the enzyme generally catalyzes a chemical alteration of a chromogenic substrate that can be measured using various techniques. For example, the enzyme may catalyze a color change in a substrate, which can be measured spectrophotometrically.
  • the enzyme may alter the fluorescence or chemiluminescence of the substrate.
  • the chemiluminescent substrate becomes electronically excited by a chemical reaction and may then emit light which can be measured (using a chemiluminometer, for example) or donates energy to a fluorescent acceptor.
  • enzymatic labels include luciferases (e.g., firefly luciferase and bacterial luciferase; U.S. Pat. No.
  • luciferin 2,3-dihydrophthalazinediones, malate dehydrogenase, urease, peroxidase such as horseradish peroxidase (HRP), alkaline phosphatase (AP), (3-galactosidase, glucoamylase, lysozyme, saccharide oxidases (e.g., glucose oxidase, galactose oxidase, and glucose-6-phosphate dehydrogenase), heterocyclic oxidases (such as uricase and xanthine oxidase), lactoperoxidase, microperoxidase, and the like.
  • HRP horseradish peroxidase
  • AP alkaline phosphatase
  • saccharide oxidases e.g., glucose oxidase, galactose oxidase, and glucose-6-phosphate dehydrogenase
  • heterocyclic oxidases such
  • Examples of enzyme-substrate combinations include, for example: Horseradish peroxidase (HRP) with hydrogen peroxidase as a substrate, wherein the hydrogen peroxidase oxidizes a dye precursor (e.g., orthophenylene diamine (OPD) or 3,3′,5,5′-tetramethylbenzidine hydrochloride (TMB)); alkaline phosphatase (AP) with para-nitrophenyl phosphate as chromogenic substrate; and (3-D-galactosidase ((3-D-Gal) with a chromogenic substrate (e.g., p-nitro phenyl-(3-D-galactosidase) or fluorogenic substrate 4-methylumbelliferyl-(3-D-galactosidase.
  • HRP Horseradish peroxidase
  • OPD orthophenylene diamine
  • TMB 3,3′,5,5′-tetramethylbenzidine hydrochloride
  • AP
  • the present invention relates to an in vitro method for diagnosing CRC by detecting an antibody to p53 (anti-p53 antibody) in a sample, the method comprising: a) incubating a sample to be analyzed with a p53 capture antigen and a p53 detection antigen, whereby a complex comprising the p53 capture antigen the anti-p53 antibody and the p53 detection antigen is formed, b) separating the complex formed in (a) from unbound detection antigen, c) measuring the complex obtained in step (b) via the detection antigen comprised therein, and d) diagnosing CRC if anti-p53 antibody is measured in the sample.
  • Liquid samples can be used in a method for specific in vitro-detection of anti-p53 antibodies in a method according to the present disclosure.
  • the sample may be known to comprise an anti-p53 antibody or it may be suspected of comprising an anti-p53 antibody.
  • the sample for in vitro diagnosis used in a method according to the present disclosure is a body fluid selected from whole blood, blood serum, blood plasma, liquor, urine or saliva.
  • the sample suspected of comprising or comprising an anti-p53 antibody is serum, plasma or liquor.
  • the sample suspected of comprising or comprising an anti-p53 antibody is serum or plasma.
  • DGS double antigen sandwich assay
  • DAGS assay for detection of anti-p53 auto-antibodies present in a sample as an enzyme-linked immuno sorbent assay (ELISA) in microtitre plates.
  • ELISA enzyme-linked immuno sorbent assay
  • an anti-p53 assay was developed running on the automated electrochemiluminescense-based analyzers from Roche Diagnostics, Mannheim, Germany.
  • biotinylated peptides one comprising the peptide of SEQ ID NO:1 and the other comprising the peptide of SEQ ID NO:2 are used as the capture antigen and the ruthenylated forms of both these peptides are used as the detection antigen.
  • E dipeptide glutamic acid
  • U ß-alanine
  • sequence of the recombinant p53-construct was as follows:
  • the underlined parts of the sequence represent SEQ ID NO:1 and SEQ ID NO:2, respectively.
  • the sequence part given in cursory writing corresponds to the sequence derived from the chaperone Skp.
  • the octa-His-tag is at the C-terminus of this recombinant polypeptide as used in the p53 detection antigen.
  • the recombinant polypeptide of SEQ ID NO:3 was produced according to procedures well known in the art and e.g. described in detail in EP 1 982 993 B1.
  • Ruthenylation was performed according to standard procedures. In a typical protocol for ruthenylation the lysine ⁇ -amino groups of the fusion protein are modified at protein concentrations of about 10 mg/ml with N-hydroxy-succinimide activated ruthenium labels.
  • the label:protein molar ratio can be varied from 2:1 to 7:1, depending on the respective fusion protein an requirements for density of labels.
  • the reaction buffer usually is 150 mM potassium phosphate (pH 8.0), 50 mM potassium chloride, 1 mM EDTA.
  • the coupling or labeling reaction usually is carried out at room temperature for 10 minutes and stopped by adding buffered L-lysine to a final concentration of 10 mM.
  • the respective stock solutions are e.g. prepared in dried DMSO (seccosolv quality, Merck, Germany). DMSO concentrations up to 20% in the reaction buffer are well tolerated by the fusion protein of SEQ ID NO:4 as disclosed herein.
  • DMSO concentrations up to 20% in the reaction buffer are well tolerated by the fusion protein of SEQ ID NO:4 as disclosed herein.
  • the protein spontaneously trimerizes during elution from the Ni-NTA column in the controlled refolding and purification process.
  • the resulting trimer is very stable and remains its configuration during rhutenylation and further processing.
  • the assay principle of the Elecsys® assay for detection of anti-p53 antibodies is depicted in FIG. 1 .
  • the biotinylated capture antigen (the biotinylated peptides of Example 1.1), the sample and the ruthenylated detection antigen (the labeled fusion protein of Example 1.2) are incubated to allow for formation of a complex of capture antigen-anti-p53 antibody-detection antigen.
  • Signal detection in the Elecsys® immunoassay is based on electrochemoluminiscence.
  • the biotin-conjugated capture antigen is immobilized on the surface of streptavidin-coated magnetic beads, whereas the detection antigen bears a complexed ruthenium cation as the luminescent moiety.
  • the chromogenic ruthenium complex is bridged to the solid phase and emits light at 620 nm after excitation at a platinum electrode.
  • the signal output is in arbitrary light units.
  • the buffer used for the capture antigen comprises the following components:
  • Buffer component conc Kaliumdihydrogenphosphat 65 mM Di-Kaliumhydrogenphosphat 1x H2O 35 mM NaCl 150 mM N-Methylisothiazolon-HCl 0.01% Oxy-Pyrion 0.1% Polydocanol 0.25% pH 7.2
  • the buffer used for the detection antigen comprises the following components:
  • Buffer component conc MES 50 mM NaCl 150 mM N-Methylisothiazolon-HCl 0.01% Oxy-Pyrion 0.1% Polydocanol 0.25% pH 5.4
  • Samples from 463 patients were analyzed side by side for anti-p53 antibodies using the anti-p53 assay as described in Example 2 and the commercially available assay “MESACUP Anti-p53 TEST” distributed by MEDICAL & BIOLOGICAL LABORATORIES CO., LTD., KDX Nagoya, Japan. The later was used according to the instructions given by the manufacturer.
  • Elecsys Mesacup Sensitivity Sensitivity Colorectal cancer CRC 43 97.60% 86.05% screening IBD (infectious bowel 128 96.90% 79.69% diseases) osteoarthritis 35 100% 80.00% Rheumatoid arthritis 27 96.30% 81.48% Liver cirrhosis 17 100% 70.59% Renal failure 18 100% 83.33% Autoimmun diseases 40 100% 90.00%
  • the newly anti-p53 antibody assay detects a comparable amount or slightly less of anti-p53 positive samples in colorectal cancer patients as compared to the competitor assay.
  • the area under the curve is better for the assays developed here as compared to a commercially available kit.
  • the newly developed assay for the in vitro detection of anti-p53 antibodies as disclosed herein has a very good specificity. Such good specificity e.g. translates into less clinical work-up with patients erroneously found as anti-p53 antibody positive.

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