CN108531460B - Anti-human IgM monoclonal antibody, hybridoma cell strain and application thereof - Google Patents
Anti-human IgM monoclonal antibody, hybridoma cell strain and application thereof Download PDFInfo
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Abstract
The invention relates to a hybridoma cell strain and a monoclonal antibody secreted by the hybridoma cell strain, wherein the antibody can be specifically combined with human IgM, can be used for in vitro detection of the human IgM, and is particularly suitable for early diagnosis of parainfluenza virus infection. The invention also relates to a kit comprising the hybridoma cell strain or the monoclonal antibody.
Description
Technical Field
The invention relates to a monoclonal antibody, in particular to an anti-human IgM monoclonal antibody.
Background
Immunodiagnostic reagents are one of the main types of in vitro diagnostic reagents. The reagent utilizes the specific reaction of combining antigen and antibody to perform qualitative or quantitative diagnosis, and is developed most rapidly in all diagnostic reagent products at present, whether the technology or the market.
After the pathogenic microorganisms infect a human body, IgM antibody is firstly generated in the process of stimulating and inducing humoral immune response, the early diagnosis of infectious diseases is the premise of carrying out early and effective treatment, and particularly, the early diagnosis is important for the infectious diseases with acute onset and serious illness, and the antibody which is firstly generated by an organism after infection is the IgM antibody, so that the detection of the specific IgM antibody in the blood of a patient at the early stage of pathogenesis has important significance in clinical early diagnosis.
In recent years, there have been some studies on anti-human IgM monoclonal antibodies, and for example, WO 2010026758 a1 discloses an anti-human IgM monoclonal antibody, which aims to solve the problem of low polyclonal antibody specificity and focuses on the property of monoclonal antibodies to induce agglutination between human IgM and to verify the effect of monoclonal antibodies to inhibit non-specific reactions, but does not pay attention to the systematic evaluation (e.g., antibody titer, cross-reactivity, stability, detection sensitivity and specificity, etc.) of the anti-human IgM monoclonal antibodies when used in vitro diagnostic reagents, and thus it is unclear whether the antibodies are suitable for the preparation of in vitro diagnostic reagents.
For example, the mansion organism anti-human IgM monoclonal antibody is a common commercial anti-human IgM monoclonal antibody, but it is not good enough in stability to be used as an immunodiagnostic antibody.
In fact, screening monoclonal antibodies for preparing in vitro diagnostic reagents is a complex process, and first a good antigen is obtained to prepare enough antibodies, and then the antibodies are systematically evaluated to obtain candidate antibodies with clinical relevance, and then the candidate antibodies are developed into detection reagents. The antibody titer, the cross reactivity, the stability, the clinical effect and the like are important evaluation factors, for example, the antibody titer reflects the lowest titer of the antigen reaction under a certain concentration, and the lower the titer is, the higher the titer is; antibody cross-reactivity may affect the specificity of the antibody; the stability of the antibody directly affects the reliability of the final result, and the antibody with poor stability has higher requirements on storage conditions and operation conditions, so that the practicability of the antibody as a diagnostic reagent and the reliability of the result are reduced, and the increase of the cost is inevitably caused; clinical trials are used to demonstrate the efficacy of antibodies in diagnosing a particular disease.
Therefore, for in vitro diagnostic applications, there is a great need in the art for monoclonal antibodies that provide better results for systemic evaluation, and are particularly useful for early diagnosis of pathogenic infections.
Disclosure of Invention
The invention aims to provide an anti-human IgM monoclonal antibody, a hybridoma cell strain secreting the anti-human IgM monoclonal antibody, a kit containing the monoclonal antibody or the hybridoma cell strain and application of the monoclonal antibody or the hybridoma cell strain in detection of human IgM. Through systematic evaluation, the antibody has better performance in all aspects, so that the antibody is suitable to be used as an immunodiagnostic reagent for preparing an in vitro diagnosis kit, and is particularly suitable to be used for preparing an early diagnosis kit for parainfluenza virus.
Therefore, the inventor carries out a great deal of research, immunizes a mouse by using human IgM, clones at least 4 times by a limiting dilution method after cell fusion until the monoclonal antibody is reached, screens 1 novel Hybridoma cell strain (Hybridoma) IgM-7 capable of stably secreting the antibody from the obtained clones, and stores the Hybridoma cell strain in a China center for type culture collection, Wuhan university at Wuchang Lojiashan mountain at Wuhan city, Hubei province in 2018 and 8 days at 3 and 8 days, wherein the preservation number is CCTCC NO: C201849, thereby completing the invention.
In a first aspect, the invention provides a hybridoma cell strain which is preserved in China Center for Type Culture Collection (CCTCC) with the preservation number of C201849.
In a second aspect, the invention provides a monoclonal antibody capable of specifically binding to human IgM.
In one embodiment, the monoclonal antibody does not bind to human IgG, murine IgG, rabbit IgG, or bovine IgG.
In another embodiment, the monoclonal antibody has a median potency of 41150 and superior stability and reliability under repeated freeze-thaw, long-term storage, heat accelerated harsh conditions.
In a preferred embodiment, the monoclonal antibody is an antibody secreted by the hybridoma cell line of the invention.
In a third aspect, the invention provides a kit, which comprises the hybridoma cell strain or the monoclonal antibody of the invention.
In a specific embodiment, the kit is a colloidal gold immunoassay kit, a chemiluminescent kit, a radioimmunoassay kit, an enzyme-linked immunoassay kit or a fluorescent immunoassay kit.
In a preferred embodiment, the kit is an enzyme linked immunosorbent assay kit.
In another embodiment, the kit is a microfluidic chip.
In a fourth aspect, the invention provides the use of the hybridoma cell strain or monoclonal antibody of the invention in the preparation of a kit.
In one embodiment, the kit is based on immunoassay, preferably, the kit is a colloidal gold immunoassay kit, a chemiluminescent kit, a radioimmunoassay kit, an enzyme-linked immunoassay kit or a fluorescent immunoassay kit.
In a preferred embodiment, the kit is an enzyme linked immunosorbent assay kit.
In another embodiment, the kit is a microfluidic chip, preferably, the microfluidic chip is based on immunoassay.
In one embodiment, the kit is for detecting human IgM.
In a preferred embodiment, the human IgM is human IgM that is produced early in a pathogenic infection.
In a specific embodiment, the pathogen is a parainfluenza virus.
In addition, the invention also provides the application of the hybridoma cell strain or the monoclonal antibody in preparing a kit for parainfluenza virus diagnosis, preferably a kit for parainfluenza virus early diagnosis.
The monoclonal antibody has the beneficial effects that firstly, the antibody titer is at least one order of magnitude higher than that of a commercially available human IgM antibody usually used in-vitro diagnosis, and the monoclonal antibody has a better immune effect; secondly, the antibody has no cross reaction with human IgG, mouse IgG, rabbit IgG and bovine IgG, and has good specific binding capacity; thirdly, it has superior long-term and thermal stability to commercially available human IgM antibodies, that is, it has an extended life and can accept relatively loose storage and handling conditions, thus greatly saving costs; finally, clinical experiments show that the monoclonal antibody can be used for an enzyme linked immunosorbent assay kit for parainfluenza virus IgM antibody detection, the detection sensitivity can reach 100%, and the detection specificity can reach 100%.
That is, the monoclonal antibody of the invention shows good performance in various aspects such as antibody titer, cross reactivity, stability and detection effect, so that the invention provides an anti-human IgM monoclonal antibody which can be used for in vitro diagnosis through systematic evaluation and has outstanding comprehensive capacity.
Drawings
FIG. 1 shows a SDS-PAGE electrophoresis of the antibody IgM-Ab7 of the present invention;
FIG. 2 shows the results of measurement of antibody titer of the antibody IgM-Ab7 of the present invention with two commercial anti-human IgM antibodies, wherein the abscissa is L og (dilution factor) and the ordinate is OD450。
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Antibodies
As used herein, the term "antibody" refers to immunoglobulin molecules, including but not limited to chimeric antibodies, humanized antibodies, fully human antibodies, CDR-grafted antibodies, and antibody constructs, such as single chain fv (scfv) or antibody fusion proteins; furthermore, it relates to antibodies produced/synthesized recombinantly or synthetically.
In a preferred embodiment, the antibody is an antibody produced from a hybridoma cell line with the preservation number of CCTCC NO: C201849.
An "antibody fragment" typically includes the antigen-binding region, light and/or heavy chain variable regions, at least a portion of one or more (e.g., six) CDRs, of the parent antibody that retain at least some of the binding specificity of the parent antibody. In particular, the parent antibody herein refers to an antibody produced from a hybridoma cell line having a preservation number of CCTCC NO: C201849. Examples of antibody fragments include, but are not limited to, Fab ', F (ab')2, and Fv fragments; a dimeric molecule; a linear antibody; single chain antibody molecules, e.g., sc-Fv; and multispecific antibodies formed from antibody fragments. Typically, when the activity is expressed on a molar basis, the fragments retain at least 50% of the binding activity to human IgM. Preferably, the fragment retains at least 60%, 70%, 80%, 90%, 95%, or 100% of the binding activity to human IgM as compared to the parent antibody.
Preferably, an antibody fragment refers to the antigen binding region, the light and heavy chain variable regions or the six CDRs of an antibody.
"antibody derivatives" refer to conservative amino acid substitutions (referred to as "conservative variants") that may include antibodies whose biological activity is not substantially altered as compared to the parent antibody.
The invention provides monoclonal forms of the antibodies.
As used herein, the term "monoclonal antibody" refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Monoclonal antibodies are highly specific for a single antigenic site. Monoclonal antibodies are advantageous because they can be obtained by culture of hybridoma cell lines and are substantially free of contamination by other immunoglobulins.
Reagent kit
The detection kit of the present invention may take various forms, for example, a strip, a cartridge containing various reagents required for the test, a microfluidic chip, etc., and the kit may be manufactured according to standard procedures known to those skilled in the art.
Kits of the invention may include containers, chips, instructions for use, buffers, immunological aids, and/or other materials, structures, and/or reagents as desired for performing the diagnosis/assay.
In the examples, the kit of the present invention is illustrated by using enzyme-linked immunoassay as an example, but it should not be construed that the kit of the present invention is limited to enzyme-linked immunoassay.
The kit of the present invention includes an antibody produced from a hybridoma cell line having a preservation number of CCTCC No. C201849, which may be present in a manner conventional in the art, for example, in a dissolved or dried form in a container, coated on a solid phase carrier (e.g., a film, a plate, beads, particles (e.g., magnetic particles), etc.), and present in a dissolved or dried form in a chamber of a chip, but the present invention is not limited thereto.
Due to objective factors such as transportation and use places, the kit is often suitable for field detection in various complex environments, so that the stability of raw materials is one of important factors for restricting the kit result. As shown in example 9 below, the antibody IgM-Ab7 of the invention possesses better stability as a raw material for enzyme linked immunosorbent assay kits than conventional IgM antibodies under extreme conditions, thereby enhancing the reliability of the results of the kits and reducing the cost in a variable manner.
The antibody of the present invention can be used at a concentration of 0.1 to 10. mu.g/ml, preferably 1 to 5. mu.g/ml, and more preferably 2.3. mu.g/ml.
Other materials required for diagnosis/detection in the kit of the present invention include, but are not limited to, anti-human IgM antibodies other than the antibodies of the present invention, antigens bound to human IgM antibodies, and/or human IgM. The other materials mentioned above may be present in a manner conventional in the art, for example, in dissolved or dried form in a container, coated on a solid support (e.g., a membrane, a plate, beads, particles (e.g., magnetic particles), etc.), in dissolved or dried form in a chamber of a chip, but the present invention is not limited thereto.
Other structures required for performing a diagnosis/test in the kit of the invention include, but are not limited to, structures for sampling, structures for performing controls, and/or structures for observing the course or result of the test.
Other reagents required for performing the diagnosis/detection in the kit of the present invention include, but are not limited to, detergents, visualization reagents and/or terminating reagents.
In one embodiment, the antibody in the kit of the invention is detectably labeled. Any label and labeling method known to those skilled in the art may be used. For example, the labels that may be used in the present invention include enzymes, radioisotopes, colloidal metals, fluorescent compounds, chemiluminescent compounds, and bioluminescent compounds, but the present invention is not limited thereto.
Commonly used labels may include enzymes (e.g., horseradish peroxidase, β -galactosidase, alkaline phosphatase, etc.), radioisotopes (e.g., horseradish peroxidase, β -galactosidase, etc.), and the like32P or125I) Etc., biotin, digoxin, colloidal metals (e.g., colloidal gold, etc.), fluorescent dyes (e.g., fluorescein, rhodamine, texas red, etc.), chemiluminescent compounds, or bioluminescent compounds (e.g., dioxetane, luminol, acridinium, etc.). Any labeling step well known in the art may be used, such as covalent coupling of an enzyme or biotin group, iodination, phosphorylation, biotinylation, and the like.
In some embodiments, one or more of the other materials required for diagnosis/detection may also be detectably labeled.
In a preferred embodiment, the kit of the present invention is a kit for early diagnosis of a pathogen.
Use of
The anti-human IgM antibody or hybridoma cell strain of the present invention can be used for any purpose related to the specific reaction of human IgM. Preferably, the antibody or hybridoma cell strain can be used for detecting human IgM.
The antibody or hybridoma cell strain can be used for detecting biological samples from human beings.
As used herein, "biological sample" refers to semen, lymph, serum, plasma, urine, synovial fluid, or spinal fluid. In a preferred embodiment, the biological sample is blood, serum or plasma.
Preferably, a biological sample from a human at an early stage of onset is used.
The presence of human IgM can be detected quantitatively or qualitatively using immunoassay methods which typically involve incubating or sequentially contacting a biological sample with the antibodies of the invention and/or other materials required for detection and detecting the bound antibodies by a variety of techniques well known in the art.
Such methods include, inter alia, Western blotting, overlay assays, RIA (radioimmunoassay) and IRMA (immunoradioimmunoassay), GIA (colloidal gold immunoassay), EIA (enzyme immunoassay), E L ISA (enzyme-linked immunosorbent assay), FIA (fluorescent immunoassay), and C L IA (chemiluminescent immunoassay).
The anti-human IgM monoclonal antibody can be combined with human IgM produced by various pathogenic infections, but when preparing in vitro diagnostic reagents, the diagnostic effect is inevitably different due to different detection systems or different properties of antibodies. As shown in example 8 below, the antibodies of the invention are superior in their effectiveness in detecting IgM caused by parainfluenza virus (PIV) over currently common commercial detection kits.
Therefore, in a preferred embodiment, the antibody or hybridoma cell line of the invention is particularly suitable for detecting human IgM produced at the initial stage of parainfluenza virus infection, thereby diagnosing whether an individual is infected with parainfluenza virus.
The antibody or hybridoma of the invention can be used for detecting whether a subject is infected with parainfluenza virus or whether the subject suffers from pneumonia, bronchitis, bronchiolitis, upper respiratory tract infection and the like caused by parainfluenza virus.
The embodiments of the present invention will be described in detail with reference to examples, which do not indicate specific conditions, and are performed according to conventional conditions or conditions suggested by manufacturers. The reagents or apparatus used are not indicated to the manufacturer, but are conventional products which are commercially available.
EXAMPLE 1 immunization of mice
Diluting human IgM (Sichuan Michael Biotech Co., Ltd., lot No. 150127) extracted from blood source to 3.0mg/ml with normal saline, mixing with Freund 'S complete adjuvant (Sigma Co., cat No. S L BF-9338V) in equal volume, emulsifying into oily emulsion with 1ml syringe until oily emulsion dropped into water is not dispersed, administering the emulsion to BA L B/c mouse (Duudoushui laboratory animal center, 6 week old female, 2) under axillary fossa in 140 μ l/mouse, mixing human IgM and Freund' S adjuvant (Sigma Co., cat No. S L BM9367V) in equal volume, emulsifying, administering 70 μ l/mouse, enhancing immunity once every week, collecting tail blood before each immunization, separating, and measuring 2 mice with indirect E L ISA method, wherein the blood serum titer of 2 mice is greater than 1:106I.e. can be used for fusion. 3 days before fusion, the human IgM was diluted to 3.0mg/ml with physiological saline, and then mixed with the same volume of physiological saline in the tail vein for additional immunization at a dose of 70. mu.l/mouse.
EXAMPLE 2 preparation of hybridoma cell lines
2-1 preparation of feeder cells
Taking normal 10-week-old BA L B/c mouse abdominal cavity macrophages as feeder cells, taking BA L B/c blood from eyes and neck to be killed 1 day before fusion, soaking in 0.1% benzalkonium bromide for 1 minute, transferring into 75% alcohol to soak for 1 minute, cutting off abdominal skin with scissors under aseptic operation in a super clean bench, exposing peritoneum, and usingInjecting 3.5ml of RPMI1640 basic culture solution into abdominal cavity of syringe, taking out with dropper, adding 6.5ml of RPMI1640 basic culture solution, repeatedly washing, recovering washing liquid, centrifuging at 1000rpm for 5min to obtain precipitate, resuspending with RPMI1640 culture solution containing 20% newborn calf serum, adjusting cell concentration to 3.1 × 105Adding into 96-well plate at 100 μ l/well, 37 deg.C and 5% CO2And (5) culturing.
2-2 preparation of immune splenocytes
Three days after additional immunization of the mice in example 1, the spleens were removed under aseptic conditions, placed in a dish, washed once with RPMI1640 basic medium, minced, ground, filtered to obtain dispersed splenocytes, centrifuged at 1000rpm for 5 minutes to leave a pellet, resuspended in RPMI1640 basic medium, and counted by 3% acetic acid dilution.
Preparation of 2-3 myeloma cells
Mouse myeloma cell Sp2/0 (preserved by Sichuan Mike biological new material technology Co., Ltd.) is screened by 8-azaguanine, cultured to logarithmic phase, and taken 5 bottles (75 cm)2) Making into cell suspension, centrifuging at 1000rpm for 5min to obtain precipitate, resuspending with RPMI1640 basic culture medium, counting, and adding 1.3 × 105The cells are cultured in flasks at an individual/ml cell concentration (15-30 ml of complete 1640 medium is generally replaced every 1-2 days).
2-4 cell fusion and HAT selective culture hybridoma
Myeloma cells and immune spleen cells were mixed at a ratio of 1:10, washed 1 time with RPMI1640 basic medium in a 50ml conical centrifuge tube, and centrifuged at 1000rpm for 5 minutes to leave a precipitate. The cells were mixed well and fused slowly with 0.5ml of 50% PEG4000, and fused for 1 minute, and then fused with 50ml of RPMI1640 basic medium to terminate the cell fusion. After centrifugation at 700rpm for 5 minutes, the cells were resuspended in 1640 medium containing 1% HAT and 20% newborn calf serum, and 8 sets of 96-well cell culture plates were dropped on average. 37 ℃ and 5% CO2The next day of culture, supplemented with 1640 medium containing 1% HAT and 20% newborn bovine serum to well-full. The medium was changed half after 5 days and again half after 7 days.
Screening of 2-5 Positive cell lines
With 0.06M pH9.6 carbonic acidDiluting human IgM (Tetrakahmheck Biotechnology Limited, batch No. 150127) to 5 μ g/ml with a buffer solution, coating 100 μ l per well of a 96-well ELISA plate for detecting cell culture supernatant, placing in a refrigerator at 2-8 ℃ overnight, discarding the liquid in the well the second day, washing the plate with E L ISA washing solution three times, patting up, washing with 10% calf serum-containing 0.01MpH7.2 PBS at 150 μ l/well, sealing at 37 ℃ for 2 hours, patting up, vacuum-packaging for later use, taking 100 μ l of cell supernatant in the 96-well detection plate, incubating at 37 ℃ for 40 minutes, washing the plate with E L ISA washing machine five times, adding 8000 times of diluted horse radish peroxidase-labeled goat anti-mouse IgG (produced by Tetrakahmheck Biotechnology Limited), incubating at 37 ℃ for 30 minutes, adding 100 μ L containing 0.1% (M/V) o-phenylenediamine, 0.1% of the diluted buffer solution, adding the diluted rat anti-mouse IgG (produced by Tetrakahmheck Biotechnology Limited), diluting the supernatant, the serum suspension of the diluted rat), collecting the cell suspension, inoculating the supernatant, inoculating the cell suspension to a standard, inoculating the cell suspension to a standard, inoculating the cell, inoculating the suspension to a standard, inoculating the cell, inoculating the suspension to a cell, inoculating the suspension to a standard cell, inoculating the cell, and the cell, inoculating the cell, and6counting the cells per ml (if the number of cells is not within the range, re-centrifuging the cells according to the total cell count, adding a proper amount of the frozen stock solution again, and finally making the cell concentration be 4-8 × 106One/ml) and then subpackaged in sterile jelly0.5ml of cell sap is added into each frozen tube. 11 hybridoma cell strains capable of stably secreting IgM monoclonal antibody antibodies are obtained by cell fusion and are shown in Table 1 below. The antibody secreted by the hybridoma cell 2C1-B3-G6-H5-H3 has the best effect when being used for detecting the IgM antibody in the early stage of parainfluenza virus infection, the hybridoma cell strain is marked as IgM-7, is preserved in China center for type culture Collection on 3 and 8 months in 2018, and has the preservation number of CCTCC NO: C201849.
TABLE 1 hybridoma cell lines stably secreting anti-human IgM monoclonal antibody
| Hybridoma cell | Hybridoma cell | Hybridoma cell |
| 8A7-C4-H3-H5-D3 | 1F9-A4-D5-G1-F4 | 4D3-G8-D1-B4-D1 |
| 8G6-D1-H12-G4-C12 | 2C1-B3-G6-H5-H3 | 4F10-B7-A12-B1-H5-F8 |
| 8E4-G11-E12-F1-D1 | 3H4-D4-D3-A2-D3 | 5E2-G1-C12-F4-H6 |
| 6D10-C5-A9-E13-G8-H2 | 7B10-F11-H2-F12-G4 |
EXAMPLE 3 preparation of monoclonal antibodies
Selecting healthy BA L B/c mice of 6-8 weeks, injecting 0.5ml liquid paraffin (Tianjin Kemiou) into the abdominal cavity of each mouse, and injecting 2.0 × 10 into the abdominal cavity of each mouse 7 days later6And (3) hybridoma cells. Ascites can be generated 7-10 days after the cells are inoculated, the health condition and ascites symptoms of the animals are closely observed, the mice are sacrificed when the ascites is as much as possible and before the mice are dying, the ascites is sucked into a test tube by a dropper, and 1-5 ml of ascites can be obtained by one mouse. The collected ascites is centrifuged to take the supernatant, and a small sample is stored in a refrigerator at the temperature of minus 20 ℃. The ascites fluid was separately precipitated by saturation with ammonium sulfate and purified by protein A affinity column chromatography, and the purity of the antibody was more than 90% by SDS-PAGE (designated as IgM-Ab7), and the results of electrophoresis are shown in FIG. 1.
Example 4 hybridoma cell culture supernatant titer assay
Diluting human IgM (Sichuan Mekken biological New Material technology Co., Ltd., batch No. 150127) to 5 μ g/ml with 0.06M pH9.6 carbonic acid buffer solution, coating 100 μ l per well in 96-well ELISA plate, placing in refrigerator for overnight at 2-8 deg.C, discarding the liquid in the well the second day, washing with E L ISA washing machine three times, patting up, using PBS containing 10% calf serum and 0.01M pH7.2, 150 μ l/well, sealing at 37 deg.C for 2 hours, discarding the liquid, patting up, detecting hybridoma cell culture supernatant, ascites and antibody titer, detecting hybridoma cell culture supernatant titer, diluting the first well with original fold supernatant culture solution, diluting from the second well to the fourth well with 0.01M pH7.2 buffer solution 10 times, diluting from the fifth well to the tenth well with 2 times, diluting the eleventh well with 100 times when fusing mouse serum, incubating with RPMI1640 complete culture medium, incubating with RPMI1640 negative buffer solution, incubating with 10.10 times of 0.1.10M PBS buffer solution, incubating with 10 g of horse radish serum, adding 0.10 g/10 min per second well of horse radish diamine, incubating with 100 μ g/10 min, incubating with 10 g of horse radish serum, incubating with 30 μ g/10 min, incubating with III buffer solution, and 0.10 g of horse radish production technology (III) and 0.10 min), incubating with III) and 0.10 g of horse radish cell, incubating with 3 g/10 min, and 0.10 g of horse radish cell, incubating with 3 g of horse radish cell, and 0.10 min, incubating with III, and 0.10 g of horseStopping reaction, measuring 450nm absorption value, negative control OD value less than 0.2, positive control OD value greater than 1.8, and determining the dilution ratio of the positive well as the hybridoma cell culture supernatant titer greater than 1:1.6 × 10, wherein the OD value is greater than 2 ×, and the OD value is greater than 1.83See table 2.
TABLE 2 culture supernatant titer results
| Enzyme-labeled |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| |
1 | 10 | 100 | 1000 | 2000 | 4000 | 8000 | 16000 | 32000 | 64000 | Positive control | Negative control |
| IgM-7 supernatant | 2.36 | 2.40 | 1.57 | 1.04 | 0.80 | 0.38 | 0.21 | 0.12 | 0.06 | 0.04 | 2.56 | 0.06 |
Example 5 ascites titer test
The E L ISA detection method is the same as that in example 4, the dilution method is different, specifically, the first hole is original ascites, the ascites is diluted step by step from the second hole to the seventh hole by 10 times with PBS buffer solution with 0.01MpH7.2, the ascites is diluted step by step from the eighth hole to the tenth hole by 2 times, the dilution ratio corresponding to the lowest positive hole is the ascites titer, the table 3 is the ascites titer, the ascites titer prepared by the hybridoma IgM-7 is more than 1:2 × 106。
TABLE 3 ascites titre
| Enzyme-labeled |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| |
1 | 10 | 100 | 1000 | 10000 | 100000 | 1000000 | 2000000 | 4000000 | 8000000 | Positive control | Negative control |
| IgM-7 ascites | 2.66 | 2.50 | 2.57 | 2.54 | 1.90 | 0.78 | 0.31 | 0.12 | 0.06 | 0.04 | 2.64 | 0.05 |
Example 6 antibody titer detection
Diluting the purified antibody IgM-Ab7 prepared in example 3 to 1mg/ml in a 0.01M PBS buffer solution with pH7.2, diluting the diluted antibody IgM-Ab7 to 100 times as an initial first well, diluting the diluted antibody IgM-Ab7 to 5 times in a stepwise manner from a second well to a tenth well, diluting the mouse serum to 100 times in fusion as a positive control in an eleventh well, using PBS as a negative control in a twelfth well, incubating the antibody in each well at 100. mu.l.37 ℃ for 50 minutes, washing the antibody in E L ISA washer for five times, adding 100. mu. L of horse radish peroxidase-labeled goat anti-mouse IgG (produced by Sichuan Mekken bioscience technology Co., Ltd.), incubating the antibody at 37 ℃ for 1 hour, adding 100. mu. L containing 0.1% (M/V) o-phenylenediamine, 0.1% (V/V) hydrogen peroxide in each well, adding a pH5.0 citric acid phosphate buffer solution at 37 ℃ for 15 minutes, adding 50. mu. L2M sulfuric acid solution in each well to terminate the reaction, and detecting 4M sulfuric acid solution to terminate the reaction50nm absorbance (multifunctional reader, manufacturer Thermo, model Varioskan Flas), repeating 3 times to obtain OD average value, wherein negative control OD value is less than 0.2, positive control OD value is more than 1.8, and antibody titer determination standard is obtained by using L OG (dilution) as abscissa and antibody average OD value as ordinate as curve, and the curve equation is y min + (max-min)/(1+10^ ((logEC50-x) × Hillslope)), fitting the curve through sigmaplot data processing software, and obtaining the median titer which is 10logEC50. The results showed that the median titer of the present antibody IgM-Ab7 was 41150. The purity of commercial anti-human IgM antibody B (purchased from Xiamen Bosheng Biotechnology Co., Ltd.) and C (bougai Takei Biotechnology Co., Ltd., Loyang) were both greater than 90%, the concentrations were uniformly adjusted to 1mg/ml, B, C titers were detected by the same method as above, and by fitting, the median titer of the antibody B was 13600, the median titer of the antibody C was 8793, and the median titer of B, C was lower than that of the antibody secreted from the hybridoma of the present invention. The results of the titer determination are shown in table 4 and figure 2.
TABLE 4 antibody titer test
Example 7 Cross-reaction assay
Diluting human IgG (Sichuan Michael Biotech Co., Ltd., lot number 140120), mouse IgG (Sichuan Michael Biotech Co., Ltd., lot number 140221), rabbit IgG (Sichuan Michael Biotech Co., Ltd., lot number 140225) and bovine IgG (Sichuan Michael Biotech Co., Ltd., lot number 140311) to 2.5 μ g/ml with a carbonic acid buffer solution of 0.06M pH9.6, each well of a 96-well ELISA plate being coated with 100 μ l, placing in a refrigerator for overnight at 2-8 ℃, discarding the liquid in the well the next day, washing the plate with E L ISA washer for three times, patting dry, labeling with 0.5% casein containing 10mM Tris-HCl (7.4) as a blocking solution, 150 μ l/well, patting for 2 hours at 37 ℃ and discarding the liquid, washing the plate for standby after patting with 0.5% casein containing 10mM Tris-HCl (7.4), diluting the IgM-Ab 64 monoclonal antibody to the same concentration (0.5mg/ml) after labeling with HRP, diluting with 500 times, 1000 times, 2000 times, incubating with 10 times of phosphoric acid buffer solution containing 10M phosphoric acid buffer solution of 10M pH9.9.6, incubating with 10 times of phosphoric acid buffer solution containing 10 μ M, after incubation, incubating with 10 μ M, 10 μ M of phosphoric acid buffer solution, 10 μ M, 10 μ g, 10 μ M of phosphoric acid buffer solution, 10 μ M, 1 μ M, 10 μ.
TABLE 5 Cross-reaction assay
Example 8 clinical diagnosis of pathogens
(1) Preparation of the kit
The kit adopts an enzyme-linked immunosorbent assay and utilizes the capture method principle.
Diluting the antibody IgM-Ab7 to 2.3 mu g/ml with 0.06M pH9.6 carbonic acid buffer solution, coating each hole in 96-hole ELISA plate with 100 mu l, placing in refrigerator at 2-8 ℃ overnight, discarding liquid in the hole the next day, washing with E L ISA plate washer three times, patting up, diluting the sample with 0.01M PBS buffer solution with pH7.2 containing 10% calf serum 500 times, adding into the coated ELISA hole, filtering with healthy human serum, diluting with 0.01M PBS buffer solution with pH7.2 containing 10% calf serum 1000 times as negative control, inactivating with positive human serum containing 10% calf serum 1000 times as positive control, diluting with 0.01M PBS buffer solution with 0.7.2 containing 10% calf serum 1000 times as positive control, incubating with 0.01M PBS buffer solution containing 10% calf serum 0.01M pH7.2 as positive control buffer solution after inactivating the parainfluenza virus IgM antibody positive human serum, incubating with 0.1-10% negative control buffer solution containing 10M serum, adding in the diluted with 10M PBS buffer solution after incubating with 10 min, adding the diluted with 10% horse radish phosphate buffer solution, adding the diluted with 10 g of the diluted positive control buffer solution, incubating with the diluted positive control solution with 10 g of the diluted positive buffer solution, adding the diluted with 10 g of the diluted positive buffer solution of horseradish peroxidase, and adding the diluted positive control solution, and incubating with the diluted positive control solution (HRP) of 10-10M phosphate buffer solution, after incubating with 0.1 min, the diluted by constant).
(2) Sensitivity detection
The detection kit prepared by the method detects 200 positive samples and 200 negative samples respectively. Table 6 shows the comparison experiment between the kit prepared by the monoclonal antibody IgM-Ab7 of the present invention and a commercial kit (Beijing Bell bioengineering Co., Ltd.), and the test results show that the detection kit prepared by the monoclonal antibody IgM-Ab7 of the present invention has higher sensitivity and specificity than the commercial kit, and the detection results are shown in Table 6.
TABLE 6 Positive and negative sample testing
Example 9 stability verification
Stability of monoclonal antibodies of the invention in harsh environments monoclonal antibody IgM-Ab7 of the invention was treated under the following conditions: repeatedly freezing and thawing at a-20 ℃ for 2 times; repeated freeze thawing at the temperature of between 20 and b for 3 times; repeatedly freezing and thawing at c-20 deg.C for 4 times; repeated freeze thawing at d-20 deg.c for 5 times; e-20 deg.C for 7 months; f thermal acceleration at 37 ℃ for 7 days; g, accelerating the heating at 37 ℃ for 14 days, and respectively testing 15 parts of positive reference substance and 15 parts of negative reference substance by the detection reagent prepared by the method under the condition that other conditions are unchanged, wherein the coincidence rate is 100 percent. The antibody is good in stability, and the detection reagent prepared by the antibody is good in precision. Selecting commercial anti-human IgM monoclonal antibody B (Xiamen Bosheng) with higher potency, processing the monoclonal antibody B under the same conditions to prepare a detection reagent for respectively detecting 15 parts of positive reference substances and 15 parts of negative reference substances, wherein the result shows that the monoclonal antibody starts to be partially degraded after being stored for 7 months at-20 ℃ or being thermally accelerated for 14 days at 37 ℃, and the detection result is not completely in accordance with the reference substances. The results of the tests are listed in table 7.
TABLE 7 stability results
Therefore, the monoclonal antibody of the invention has high stability, and the parainfluenza virus IgM antibody detection reagent prepared by the monoclonal antibody can also keep high stability and reliability under severe environmental conditions, which is a valuable progress in clinical and laboratory applications.
Claims (13)
1. A hybridoma cell strain IgM-7 which is preserved in China center for type culture Collection with the preservation number of CCTCCNO C201849.
2. A monoclonal antibody secreted by the hybridoma cell line of claim 1.
3. A kit comprising the hybridoma cell strain of claim 1 or the monoclonal antibody of claim 2.
4. The kit of claim 3, which is a colloidal gold immunoassay kit, a chemiluminescent kit, a radioimmunoassay kit, an enzyme linked immunosorbent kit or a fluoroimmunoassay kit, or which is a microfluidic chip.
5. The kit of claim 4, which is an enzyme linked immunosorbent assay kit.
6. Use of the hybridoma cell strain of claim 1 or the monoclonal antibody of claim 2 in the preparation of a kit.
7. The use according to claim 6, said kit being an immunoassay-based kit.
8. The use according to claim 7, wherein the kit is a colloidal gold immunoassay kit, a chemiluminescent kit, a radioimmunoassay kit, an enzyme linked immunosorbent assay kit or a fluoroimmunoassay kit, or the kit is a microfluidic chip.
9. The use of claim 8, wherein the kit is an enzyme linked immunosorbent kit.
10. The use of claim 6, wherein the kit is for detecting human IgM.
11. The use of claim 10, wherein the human IgM is human IgM that is produced early in a pathogenic infection.
12. The use of claim 11, wherein the pathogen is parainfluenza virus.
13. Use of the hybridoma cell strain of claim 1 or the monoclonal antibody of claim 2 for the preparation of a kit for parainfluenza virus diagnosis.
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