EP3756013A1 - Immunological method and kit for in vitro diagnosis of tumour and/or inflammatory diseases - Google Patents
Immunological method and kit for in vitro diagnosis of tumour and/or inflammatory diseasesInfo
- Publication number
- EP3756013A1 EP3756013A1 EP19711171.9A EP19711171A EP3756013A1 EP 3756013 A1 EP3756013 A1 EP 3756013A1 EP 19711171 A EP19711171 A EP 19711171A EP 3756013 A1 EP3756013 A1 EP 3756013A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antibody
- immune complex
- naprt
- disease
- bind
- 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.)
- Pending
Links
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- WGTODYJZXSJIAG-UHFFFAOYSA-N tetramethylrhodamine chloride Chemical compound [Cl-].C=12C=CC(N(C)C)=CC2=[O+]C2=CC(N(C)C)=CC=C2C=1C1=CC=CC=C1C(O)=O WGTODYJZXSJIAG-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- G01N33/574—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
- G01N33/57488—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 compounds identifable in body fluids
-
- 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
- G01N33/6893—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids related to diseases not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2800/00—Detection or diagnosis of diseases
- G01N2800/26—Infectious diseases, e.g. generalised sepsis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2800/00—Detection or diagnosis of diseases
- G01N2800/70—Mechanisms involved in disease identification
- G01N2800/7095—Inflammation
Definitions
- the present invention relates to the field of in vitro diagnosis of tumour disease and acute inflammatory disease.
- Neoplastic disease primarily solid tumours, as well as inflammatory acute disease, in particular sepsis, are surely among the most difficult diseases to be diagnosed correctly due to the considerable clinical complexity thereof.
- Tumours are one of the main worldwide causes of morbidity and mortality due to the difficult identification of these diseases at a sufficiently early stage such as to allow effective therapeutic intervention. Therefore, in the cancer field, the majority of diagnostic approaches are still based on radiological and anatomical-pathological methods, which are often invasive for the patient and associated with high costs.
- circulating biomarkers i.e. those substances whose presence and/or increased concentration in a biological fluid is associated with a specific pathological condition or its particular progress, plays a major role. Since they are present in an easily accessible tissue such as blood, determining the circulating markers allows a sort of "liquid biopsy” to be performed and a result, even in quantitative terms, to be obtained quickly and at low cost, also preventing the patient from being subject to often complex and painful invasive methods.
- the object of the present invention is to provide a diagnostic method, which allows patients suffering from a tumour disease or an acute inflammatory disease to be identified with a high degree of accuracy, preferably in an initial stage of the disease.
- NAPRT nicotinic acid phosphoribosyltransferase
- one object of the present invention is an in vitro method for the diagnosis and/or prognosis of a tumour disease and/or an acute inflammatory disease, comprising the step of determining, by a fluorescence-based suspension immunoassay, in a biological fluid sample from a subject affected by or suspected of being affected by a tumour disease and/or an acute inflammatory disease, the level of the nicotinic acid phosphoribosyltransferase enzyme (NAPRT), wherein the level of the NAPRT enzyme above a predetermined threshold is indicative of a tumour disease and/or an acute inflammatory disease.
- NAPRT nicotinic acid phosphoribosyltransferase enzyme
- the NAPRT enzyme is an intracellular enzyme that plays a key role in the NAD + cofactor recycling pathway starting from nicotinic acid, whose expression is mainly located at the hepatic and renal tissue cells.
- NAPRT EXPRESSION IN HUMAN TISSUES AND TUMORS.
- Oncotarget 2016; 7(2): 1973-83 also revealed transcriptional expression of the gene encoding the NAPRT enzyme in several human tumour cell lines, including cells from lung cancer and colon cancer.
- This threshold value is comprised within a concentration range of from 1 to 3 ng/ml. Therefore, the determination, in a biological fluid sample, of a concentration value for the NAPRT enzyme greater than 2 ng/ml is indicative of tumour disease and/or acute inflammatory disease.
- tumour disease preferably even if not exclusively, of solid tumours, preferably lung, prostate and bladder carcinoma, melanoma, mesothelioma and sarcoma, and blood neoplasms, preferably chronic lymphocytic leukaemia, myeloma and lymphoma.
- Acute inflammatory diseases include, for example, but not exclusively, sepsis, septic shock and systemic inflammatory response syndrome (SIRS).
- the method according to the present invention is a suspension immunoassay in which the solid phase, on which the affinity reagents employed for capturing the NAPRT enzyme are immobilized, is dispersed in a solution.
- this assay fonnat ensures considerable analytical sensitivity as it allows the affinity reactions to be measured within very wide analyte concentration ranges, thereby providing robust results in short times, even in real time.
- the affinity reagent used in the method of the invention is an antibody, the so-called first antibody or capture antibody, preferably a monoclonal or polyclonal antibody, suitable to selectively bind the above enzyme.
- a second antibody the so-called detection antibody
- the detection antibody binds, on the antigen molecule, an epitope different from the epitope that is bound. by the first antibody.
- the two different antibody populations can be added to the test sample simultaneously or can be reacted in sequential order (the "one step” or "two steps” techniques).
- said second antibody is a polyclonal antibody.
- the method according to the invention in addition to a second antibody, uses a third antibody, which is suitable to bind the secondary immune complex formed between the primary immune complex and said second antibody.
- the third antibody may be, for example, a species-specific antibody, i.e. an antibody able to recognize and bind the antibodies of the host animal species in which the second antibody used in the assay was generated.
- the use of a third antibody allows an additional level of specificity to be added in the qualitative or quantitative analysis of the NAPRT enzyme present in the biological fluid test sample.
- the present invention employs fluorescence-based measurements means.
- the formation of the primary immune complex can be determined by using said second antibody or said third antibody labelled with a fluorescent dye.
- the use of the second labelled antibody can only occur in the absence of the third antibody, since the presence of a fluorochrome conjugated to the second antibody and the consequent steric hindrance resulting therefrom would impair the subsequent binding of the third antibody.
- fluorescent labels most commonly used in immunoassays, exemplary, but not limiting, fluorescent labels are phycoerythrin, fluorescein isothiocyanate and tetramethylrhodamine, which give signal stability and strength, usually measurable in real time, to the labelled moiety.
- the quantitative determination of the NAPRT enzyme in biological fluid samples can occur by using a standard curve set up by employing known quantities of the NAPRT protein, preferably a recombinant NAPRT protein, and then interpolating on the above curve fluorescence signals measured in the examined samples.
- a standard curve set up by employing known quantities of the NAPRT protein, preferably a recombinant NAPRT protein, and then interpolating on the above curve fluorescence signals measured in the examined samples.
- any method for quantitative analytical assessment in immunoassays is within the scope of the present invention, and the selection of which method is within the skills of those of ordinary skill in the art.
- the suspended solid phase immobilizing the primary antibody used in the method of the invention is a magnetic bead, on whose surface the formation of the primary immune complex and the immunometric assay occur.
- the use of magnetic beads as a solid support in an immunoassay facilitates their separation from the solution in which they are suspended by means of a magnet.
- this embodiment of the method according to the invention allows operations on small sample volumes as well as a significantly larger analyte dynamic range to be measured compared to the prior art solid- support immunoassays, among which ELISA immunoassays are mentioned, for example.
- the method according to the invention is a multiple format suspension immunoassay, wherein the determination of the NAPRT enzyme takes place in parallel with the measurement of other analytes occurring in the same biological sample at concentrations that can also be very different from each other.
- the magnetic beads acting as a solid phase for immobilizing the primary capture antibodies are conjugated to two fluorochromes having different emission spectra, occurring in varying ratios.
- the particular combination of fluorochromes therefore represents a sort of labelling, which, once detected by means of a detection laser, allows beads conjugated to different antibodies to be distinguished from one another after they have been mixed together within the same sample.
- the formation of specific immune complexes on the conjugated beads is detected by using an antibody labelled with a fluorescent dye that has spectral properties different from those possessed by the two fluorochromes used for the labelling/identification of the beads.
- the diagnostic method of the invention may employ any type of biological fluid sample suitable for assessing the protein content, preferably blood samples and derivatives thereof, such as serum and plasma or cell culture supernatants.
- kit including means suitable to perform the method according to the ihvention, as defined in claim 11, is also included within the scope of the present invention.
- EXAMPLE 1 NAPRT suspension immunoassay The present inventors have set up a suspension immunoassay suitable for assessing the NAPRT enzyme levels in clinical biological fluid samples, according to the scheme described in Figure 1, In short, a set of magnetic beads (Bio-Rad) was chemically conjugated to a monoclonal antibody (ProteinTech) capable of specifically binding the C- terminal region of the NAPRT protein.
- a set of magnetic beads Bio-Rad
- a monoclonal antibody ProteinTech
- the suspension of conjugated beads (100 beads/pl Bio-Rad reaction buffer) was distributed in a 96-well plate (50 pl/well) and subjected to two subsequent washing steps.
- the analysis was performed on plasma and serum samples obtained from patients with cancer (312 patients), inflammatory disease (93 patients), as well as healthy subjects (121 individuals).
- the above samples were diluted 1 :4 by using the Bio-Rad buffer.
- a standard curve was set up by using known decreasing concentrations of the recombinant NAPRT protein, from 200 ng/ml to 0.035 ng/ml, in Bio-Rad dilution buffer mimicking the human serum.
- clinical samples and standard samples were distributed in duplicate in the 96-well plate containing the conjugated beads (25 pl/well), according to a predefined scheme. The plate was then incubated for 3 hours at room temperature under stirring and subsequently subjected to three washing rounds in the buffer.
- each well of the plate was then added with the solution containing the polyclonal detection antibody (antibody concentration 5 pg/ml), and the plate was incubated for 90 minutes at room temperature under stirring and subsequently subjected to three washing rounds in the buffer.
- the detection antibody used in the assay specifically recognizes the central portion of the NAPRT protein.
- each well of the plate was added with the solution containing the polyclonal anti-detection antibody species (rabbit) antibody conjugated to the Phycoerythrin (PE) fluorochrome (antibody concentration 3 pg/ml), and the plate was incubated for 30 minutes at room temperature under stirring.
- Bio-Rad buffer a 125 pl-volume of Bio-Rad buffer was dispensed into each of the 96 wells of the plate. The plate was incubated for five minutes at room temperature under stirring, and subsequently subjected to cytofluorimeter high sensitivity reading by analysing the red fluorescence (phycoerythrin).
- EXAMPLE 2 interpretation of the results
- the present inventors have set up a standard curve by using known decreasing concentrations of the recombinant NAPRT protein, from 200 ng/ml to 0.035 ng/ml, in Bio-Rad dilution buffer mimicking the composition of human serum.
- the fluorescence values measured in the clinical samples according to the above-described method have been interpolated on the values obtained for the standard curve and translated into a corresponding protein concentration value (ng/ml), taking into account the dilution factor to which the samples had been subjected prior to the immunoassay.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Urology & Nephrology (AREA)
- Hematology (AREA)
- Cell Biology (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Microbiology (AREA)
- Physics & Mathematics (AREA)
- Biotechnology (AREA)
- Biochemistry (AREA)
- Medicinal Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Hospice & Palliative Care (AREA)
- Oncology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102018000002866A IT201800002866A1 (en) | 2018-02-20 | 2018-02-20 | Immunological procedure and kit for the in vitro diagnosis of tumor and / or inflammatory pathologies. |
PCT/IB2019/051314 WO2019162821A1 (en) | 2018-02-20 | 2019-02-19 | Immunological method and kit for in vitro diagnosis of tumour and/or inflammatory diseases |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3756013A1 true EP3756013A1 (en) | 2020-12-30 |
Family
ID=62143519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19711171.9A Pending EP3756013A1 (en) | 2018-02-20 | 2019-02-19 | Immunological method and kit for in vitro diagnosis of tumour and/or inflammatory diseases |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3756013A1 (en) |
IT (1) | IT201800002866A1 (en) |
WO (1) | WO2019162821A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8912184B1 (en) * | 2010-03-01 | 2014-12-16 | Alzheimer's Institute Of America, Inc. | Therapeutic and diagnostic methods |
KR101941054B1 (en) * | 2016-07-20 | 2019-01-23 | 연세대학교 산학협력단 | Composition for predicting prognosis of cancer and kit comprising the same |
-
2018
- 2018-02-20 IT IT102018000002866A patent/IT201800002866A1/en unknown
-
2019
- 2019-02-19 EP EP19711171.9A patent/EP3756013A1/en active Pending
- 2019-02-19 WO PCT/IB2019/051314 patent/WO2019162821A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
IT201800002866A1 (en) | 2019-08-20 |
WO2019162821A1 (en) | 2019-08-29 |
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