WO2023145787A1 - 菌体可溶化画分を用いた、ヘリコバクター・スイス抗体の検出法 - Google Patents
菌体可溶化画分を用いた、ヘリコバクター・スイス抗体の検出法 Download PDFInfo
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- pylori
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- solubilized fraction
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- fraction
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Classifications
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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
-
- 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
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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
- G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
Definitions
- the present invention is based on H.I. It relates to a method for assaying Helicobacter suis antibodies using a Swiss solubilized fraction.
- H. pylori a microscopic pathogen that parasitizes the human stomach. It is known that infection with temperamental Gram-negative Helix, hereinafter referred to as "H. pylori" is involved.
- H. pylori infection test methods include the isolation culture method, urea breath test (UBT), and H. pylori in serum and urine.
- pylori antibody titer ELISA and latex agglutination
- H. pylori in stool pylori antigen measurement (immunochromatographic method) and gastric biopsy rapid urease test (RUT) are mainly employed.
- H.I. H. pylori due to the spread of diagnosis and eradication of H. pylori.
- H. NHPH Non-Helicobacter pylori hericobacters; Helicobacter other than H. pylori
- H. NHPH includes Helicobacter suisse (hereinafter H. Switzerland), H. bizzozeronnii, H. felis, H. salmonis, H. ailurogastricus, H. cynogasticus, H. baculiformis, H. mustelae, H. acinonychls, H.; cetorum and H. heilmannii, of which the majority found in the human stomach are H. Switzerland.
- H. pylori infects only primates, and infection from close relatives is assumed only in infancy, but H. pylori infects only primates. In Switzerland, people of all ages are infected by animals such as pigs and monkeys.
- Non-Patent Document 1 About 100,000 years ago, H. Switzerland was parasitic on the stomachs of monkeys. Then, 15,000 years ago, pigs were also infected. With the domestication of pigs, the infection spread explosively, and humans also became infected (Non-Patent Document 1). 181 strains of H . When MLST (Multi Locus Sequencing Typing) analysis of Swiss genes was performed, independent clusters were formed by infected host animals, but strains isolated from humans did not form independent clusters and were included in swine clusters. Therefore, the source of infection to humans was determined to be pigs (Non-Patent Document 2). Therefore, there is a need for infection diagnosis and disinfectants in pigs and humans.
- MLST Multi Locus Sequencing Typing
- JP 2016-10331 A International publication WO2019/225639
- the present invention is based on H.I. It is an object of the present invention to provide a method and a reagent for measuring antibodies to Helicobacter suis using a solubilized fraction of Swiss.
- Patent Document 1 describes H. It discloses immobilizing the Swiss F2R2 protein on a plate and measuring antibodies in the serum.
- Patent Document 2 discloses that HsvA protein, which is said to have a higher antibody titer than F2R2 protein, is immobilized on a plate to measure antibodies in serum.
- the present invention relates to the following inventions: [1] At least H. H. spp. of a subject-derived specimen containing the Swiss solubilized fraction, or proteins and anti-Ig antibodies contained in the solubilized fraction. A reagent that detects antibodies that bind to Swiss solubilized fractions or proteins contained in solubilized fractions. [2] The reagent of [1], wherein the subject is a mammal. [3] The reagent of [1] or [2], wherein the specimen is derived from blood. [4] Furthermore, H. pylori cell component or H. pylori. H. pylori in a subject-derived specimen containing antibodies against H.
- pylori body components antibodies that bind to H. pylori or H. pylori.
- anti-H A method characterized by detecting an antibody that binds to the Swiss solubilized fraction or to a protein contained in the solubilized fraction: (a) A specimen derived from a subject is treated with H.I.
- the H.I. The method according to any one of [6] to [8], characterized in that antigens of H. pylori body components are also detected: (a) A specimen derived from a subject is treated with H.I. (b) contacting with antibodies against H. pylori body components; H. pylori in the sample bound to antibodies against H. pylori body components. A step of detecting an antigen of a H. pylori body component. [11] A subject whose antibody was detected by the measurement using the reagent of any one of [1] to [5] and/or by the method of any one of [6] to [10] is treated with H.I. determine infected with Switzerland, H. Swiss infection detection method. This specification includes the disclosure of Japanese Patent Application No. 2022-009273, which is the basis of priority of this application.
- H. anti-H. Swiss antibodies can be measured with high sensitivity.
- FIG. 2 is a diagram showing the results of ELISA using human serum (3600-fold dilution) as a sample and H. suis whole cell or H. suis solubilized fraction as an antigen.
- FIG. 2 graphically shows the results of ELISA using human serum (3600-fold dilution) as the specimen and H. suis whole cells (FIG. 2A) or H. suis solubilized fraction (FIG. 2B) as the antigen.
- FIG. 2 is a diagram showing the results of ELISA using mouse serum (3600-fold dilution) as a sample and H. suis whole cell or H. suis solubilized fraction as an antigen.
- FIG. 4 graphically shows the results of ELISA using mouse serum (3600-fold dilution) as specimen and H.
- FIG. 4 shows the results of ELISA using human serum (3,600-fold dilution) as the specimen and the H. pylori solubilized fraction (Fig. 5A) or H. suis solubilized fraction (Fig. 5B) as the antigen.
- FIG. 2 is a graph showing the results of ELISA using human serum (3600-fold dilution) as the specimen and H. pylori solubilized fraction or H. suis solubilized fraction as the antigen.
- FIG. 2 is a diagram showing the results of ELISA using human serum (3600-fold dilution) as a specimen and H.
- FIG. 4 is a diagram showing the results of ELISA using human serum (3600-fold dilution) as a specimen and H. suisse solubilized fractions or H. suisse HsVA partial peptides (SEQ ID NOS: 6 to 11) as antigens, in terms of measured values. be.
- the present invention provides a method for detecting H.
- the present invention provides a method for detecting H. pneumoniae in a subject.
- a method for determining the presence of H.S.H. It is also the method of detecting infection in Switzerland.
- the subject's H. A method of obtaining ancillary data for diagnosing Swiss infections.
- H. swiss means NHPH (Non-Helicobacter pylori helicobacters; Helicobacter other than H. pylori) or Helicobacter heilmannii sensu lato (in a broad sense) among the Helicobacter genus bacteria reported more than 50 kinds of Helicobacter hirmanii). It means the Swiss strain (Non-Patent Document 3). H. Switzerland is known to infect the stomachs of pigs, monkeys, wild boars, cats and dogs in addition to humans. H.I. The infected mammal from which Switzerland was isolated is not particularly limited and may be, for example, humans, monkeys, wild boars, or pigs.
- H. swiss solubilized fraction refers to the H. swiss solubilized fraction. This is a fraction obtained by removing H. suis outer membrane fragments after sonicating H. suis. Sonication is performed according to H.I. It can be carried out by suspending the Swiss cells in a buffer solution and using an ultrasonicator. Examples of ultrasonic crushers include a sample-enclosed ultrasonic crusher Bioruptor (BM equipment). By sonication, H.I. Swiss cells are destroyed, leaving extracellular membrane fragments. Extracellular membrane fragments can be removed by centrifugation or filtration. H.
- the Swiss solubilized fraction contains proteins, sugars and the like.
- Protein contained in the H. Swiss solubilized fraction It refers to a protein derived from H. suis contained in the fraction obtained by removing H. suis outer membrane fragments after sonicating H. suis.
- H. Methods and Reagents for Detecting Swiss Solubilized Fractions or Antibodies Against Proteins Contained in Solubilized Fractions H.
- Antibodies to the Swiss solubilized fraction were obtained from H. It refers to antibodies against antigens such as proteins and sugars contained in the Swiss solubilized fraction, and may contain multiple antibodies against various substances.
- H. An antibody against at least one of antigens such as proteins and sugars contained in the Swiss solubilized fraction was prepared by H. It is referred to as an antibody against the Swiss solubilized fraction.
- H.I. Antibodies to the proteins contained in the Swiss solubilized fraction are available from H.I.
- H. The Swiss solubilized fraction contains multiple proteins, and H. Antibodies against proteins contained in the Swiss solubilized fraction may contain multiple antibodies against various proteins.
- H. An antibody against at least one of the proteins contained in the Swiss solubilized fraction was obtained from H. It is called an antibody against proteins contained in the Swiss solubilized fraction.
- H . Antibodies are produced against the Swiss solubilized fraction or against proteins contained in the solubilized fraction.
- the antibody is H.I. Binding to an antigen contained in the Swiss solubilized fraction is said to bind the antibody to the Swiss solubilized fraction.
- a Swiss solubilized fraction or a reagent for detecting an antibody against a protein contained in the solubilized fraction can be prepared as a reagent applicable to known methods.
- Known methods include, for example, an enzyme immunoassay method (EIA method), a simple EIA method, an enzyme-linked immunosorbent assay method (ELISA method), a radioimmunoassay method (RIA method), a fluorescence immunoassay method (FIA method), and the like.
- turbidimetric method TIA method
- NIA method nephelometric method
- LIA method latex agglutination method
- LIA method particle counting method
- chemiluminescence measurement method CLIA method, CLEIA method
- sedimentation reaction method surface plasmon resonance method (SPR method); resonant mirror detector method (RMD method); Whether or not the reagent of the present invention can be applied to the desired measurement method is described in H. et al.
- H. Antibodies to the Swiss solubilized fraction, or proteins contained in the solubilized fraction, can be used as markers for H. suis infection.
- H.I. A subject's own immune system-generated H. It can be determined by confirming the presence of antibodies against the Swiss solubilized fraction or proteins contained in the solubilized fraction. The presence of these antibodies has been documented by H. It can be detected and confirmed by an antigen-antibody reaction using the Swiss solubilized fraction or proteins contained in the solubilized fraction.
- H. H . Detection of Swiss solubilized fractions or antibodies against proteins contained in solubilized fractions can be performed by enzyme immunoassay (EIA), simple EIA, enzyme-linked immunosorbent assay (ELISA), radioimmunoassay (RIA).
- EIA enzyme immunoassay
- simple EIA simple EIA
- ELISA enzyme-linked immunosorbent assay
- RIA radioimmunoassay
- FIA method fluorescent immunoassay method
- immunoblotting methods such as Western blotting
- immunochromatographic methods such as gold colloid agglutination methods; ion-exchange chromatography methods, affinity chromatography methods and other chromatographic methods
- Nephelometric method TIA method
- NIA method nephelometric method
- colorimetric method latex agglutination method
- LIA method particle counting method
- CIA method particle counting method
- SPR method surface plasmon resonance method
- RMD method resonant mirror detector method
- the present invention provides a method for producing H. Concerning the method of determining Swiss infection: (a) A specimen derived from a subject is treated with H.I. contacting with the Swiss solubilized fraction or a protein contained in the solubilized fraction; (b) H.I. (c) detecting antibodies in said sample bound to the Swiss solubilized fraction or proteins contained in the solubilized fraction; Subjects in whom the Swiss solubilized fraction or antibodies bound to proteins contained in the solubilized fraction were detected were treated with H. determined to be infected with Switzerland, while H. Subjects in whom no antibody bound to the Swiss solubilized fraction or to proteins contained in the solubilized fraction were detected were classified into H.I. The process of determining that Switzerland is not infected.
- the present invention provides a method for producing an H. Concerning the method of determining Swiss infection: (a) A sample from a subject is treated with H.I. contacting with the Swiss solubilized fraction or a protein contained in the solubilized fraction; (b) H.I. (c) measuring the level of antibodies in said sample bound to the Swiss solubilized fraction or to proteins contained in the solubilized fraction; If higher than the level of antibody measured, the subject is treated with H.I. If determined to be infected with H. switzerland and the level of antibody measured is equal to or lower than the level of antibody measured for the negative control by a similar method, the subject is tested for H. pneumoniae. The process of determining that Switzerland is not infected.
- a negative subject refers to a specimen from a subject not infected with H. suis.
- the level of antibody refers to the quantitative value of antibody, ie, antibody titer, and is expressed, for example, as the concentration in the sample. Also included in the detection of antibodies is the measurement of levels of antibodies.
- H. Whether or not the Swiss solubilized fraction or the protein contained in the solubilized fraction binds to the antibody in the specimen derived from the subject can be confirmed by the method exemplified below.
- H. The Swiss solubilized fraction or the protein contained in the solubilized fraction is bound to a solid-phase carrier, and a specimen derived from a subject is treated with H.I. After contacting with the Swiss solubilized fraction or proteins contained in the solubilized fraction, the reaction system is washed to remove unbound antibodies. As a result, H.I. There is a Swiss solubilized fraction or a complex in which a protein contained in the solubilized fraction binds to an antibody in a specimen derived from a subject.
- the reaction system After that, contact with a labeled anti-Ig antibody, the H. After binding the Swiss solubilized fraction or the subject-derived antibody bound to the protein contained in the solubilized fraction with the labeled anti-Ig antibody, the reaction system is washed to remove unbound labeled anti-Ig antibody. removing and detecting the label of the remaining labeled anti-Ig antibody; It can be determined that the Swiss solubilized fraction or the protein contained in the solubilized fraction bound to the antibody in the specimen derived from the subject. By measuring the level of the labeled anti-Ig antibody, H. The level of binding between the Swiss solubilized fraction, or proteins contained in the solubilized fraction, and antibodies in a specimen derived from a subject can also be measured.
- the anti-Ig antibody may be an anti-IgG antibody, an anti-IgM antibody, or the like, but is preferably an anti-IgG antibody.
- anti-IgG antibodies are preferably monoclonal antibodies.
- Fab, Fab', F (ab') 2 single chain antibody (scFv), VHH single domain antibody (nanobody), dsFv, dibody, fragment having specific antigen binding such as minibody (antigen-binding fragment) can also be used. Representative examples of such methods include ELISA and immunochromatography.
- Enzymes such as alkaline phosphatase and horseradish peroxidase, metal colloids such as gold colloids, silica particles, cellulose particles, magnetic particles, fluorescent particles, colored polystyrene particles, colored latex particles, and the like are used for labeling anti-Ig antibodies.
- metal colloids such as gold colloids, silica particles, cellulose particles, magnetic particles, fluorescent particles, colored polystyrene particles, colored latex particles, and the like are used for labeling anti-Ig antibodies.
- colored particles such as metal colloid particles, colored polystyrene particles, colored latex particles, etc.
- the amount of antibody can be calculated from the measured values by creating a standard curve using a standard solution whose abundance is known in advance.
- a surface plasmon resonance sensor H. Binding of the Swiss solubilized fraction, or proteins contained in the solubilized fraction, to antibodies in a specimen derived from a subject can also be detected or measured.
- the sandwich method is preferred.
- the sandwich method itself is well known in the field of immunoassay, and can be performed, for example, by an immunochromatography method or an ELISA method in which lateral flow immunoassay is performed.
- sandwich methods per se are all well-known, and the method of the present invention can be carried out by the well-known sandwich method.
- the ELISA method will be described below.
- the Swiss solubilized fraction or the protein (antigen) contained in the solubilized fraction is immobilized, and H. elegans is added to the immobilized carrier.
- a Swiss solubilized fraction or a specimen that may contain an antibody against a protein contained in the solubilized fraction is added and brought into contact with the specimen to form a complex of the antigen and the antibody on the immobilized carrier.
- an enzyme-labeled antibody that is specific to a human antibody (anti-Ig antibody) is added and brought into contact, and the anti-Ig antibody is bound to the antigen-antibody complex on the immobilized carrier.
- a substrate for the enzyme is added, an enzymatic reaction is allowed to occur, color development is measured by absorbance measurement, and a sandwich complex of the antigen and antibody on the plate can be detected.
- the antigen-antibody reaction can be carried out at 4° C. to 45° C., preferably 20° C. to 40° C., more preferably 25° C. to 38° C., and the reaction time for each binding reaction is 10 minutes to 18 hours. It is preferably 10 minutes to 3 hours, more preferably 30 minutes to 2 hours.
- H. Binding of the Swiss solubilized fraction or the protein (antigen) contained in the solubilized fraction to the carrier can be carried out by known methods such as physical adsorption and covalent bonding using functional groups.
- the immobilized amount is not particularly limited, but when the carrier is a 96-well microtiter plate, it is preferably several ng to several tens of ⁇ g per well.
- the solid-phased H.I. It can be carried out by contacting the Swiss solubilized fraction or the protein (antigen) solution contained in the solubilized fraction with the carrier. For example, H.
- the Swiss solubilized fraction or the protein (antigen) solution contained in the solubilized fraction may be dispensed into wells of a microtiter plate and allowed to stand for a certain period of time to solidify.
- the subject in the method of determining Swiss infection can be mammals such as humans, monkeys, pigs, cats, wild boars, dogs, rabbits, mice and sheep, and is preferably a human. More preferably, gastritis, chronic gastritis, goose bump gastritis, type A gastritis, gastric MALT lymphoma, diffuse large B-cell lymphoma, gastric cancer, gastric/duodenal ulcer, idiopathic thrombocytopenic purpura, functional dyspepsia, or a human patient suffering from Parkinson's disease.
- the method of the present invention can be performed qualitatively, quantitatively or semi-quantitatively (Non-Patent Document 4).
- a tissue sample taken from a subject as a biopsy or a liquid sample taken from a subject can be used as a specimen for the method of the present invention.
- the specimen is not particularly limited as long as it can be used as a target for the method of the present invention. Fluid, saliva, or fractions or processed products thereof can be mentioned.
- the H.I. Preferred specimens are blood, plasma, serum, lymph, and urine when antibodies are to be detected in the method for determining the presence of Swiss.
- kits for measuring antibodies against the Swiss solubilized fraction or a protein contained in the solubilized fraction comprising at least H. It contains a Swiss solubilized fraction or a carrier on which a protein contained in the solubilized fraction is immobilized, and further contains a labeled anti-Ig antibody.
- the Swiss solubilized fraction or proteins contained in the solubilized fraction can be appropriately prepared by methods well known to those skilled in the art with reference to the disclosure of the present specification.
- the reagent of the present invention can be produced as appropriate by a method well known in the art.
- the present invention provides a method for detecting H. H. spp. It relates to a method for determining the presence of Switzerland.
- the present invention relates to H.I. detecting antibodies to the Swiss solubilized fraction, or proteins contained in the solubilized fraction, in a subject. It relates to a method for determining Swiss infection.
- H. Subjects from whom the Swiss solubilized fraction or samples in which antibodies against proteins contained in the solubilized fraction were detected were tested for H. Switzerland exists, or H. Determined to be infected with Switzerland.
- the method of the present invention is performed by measuring the binding between the antibody in the specimen and the test reagent, whether or not it is "detected” in the determination does not necessarily mean the presence or absence of absolute detection. Instead, it may be determined in comparison with other specimens. That is, the presence/absence of detection may be determined based on the measured value instead of based on the ⁇ detection result. That is, in the method of the present invention, the step of "detecting" can be replaced with "measuring” as necessary, and whether or not it is “detected” is determined based on the measured value of the target substance and the negative target. It may be determined in comparison. For example, negative subjects, ie, H. Specimens not containing Switzerland or H.
- the target substance When the target substance is detected in a specimen derived from a subject who is clearly not infected with Switzerland, if the measured value of the subject is equivalent to that of the negative subject, it is detected in a small amount.
- H.I. Switzerland does not exist or H. Determined not to have infected Switzerland.
- the subject's measurement is high compared to the negative subject's measurement, it will be labeled as "detected.” Switzerland exists, or H. Determined to be infected with Switzerland. Therefore, it is within the pre-accepted range of the present invention that the method of the present invention accepts a small measured value for subjects that are negative.
- H. Swiss infected and H. It is possible to measure antibody titers in specimens from uninfected Swiss subjects and set a cut-off value. If it is equal to or greater than the cutoff value, the H.I. Switzerland exists or H. It is possible to determine that Switzerland is infected.
- the cutoff value can be determined, for example, by ROC (receiver operating characteristic curve) analysis.
- ROC analysis can also determine the diagnostic accuracy (sensitivity and specificity) of the method of the present invention.
- ROC analysis was carried out according to H. Specimens collected from Swiss infected persons and H. Anti-H. The Swiss antibody is measured, the sensitivity and false positive rate (1-specificity) at each cutoff value are calculated, and plotted on a coordinate system with (1-specificity) on the horizontal axis and sensitivity on the vertical axis.
- the diagnostic accuracy is analyzed by ROC analysis, the sensitivity is 80% or higher, preferably 85% or higher, more preferably 90% or higher, and the specificity is 75% or higher, preferably 80% or higher.
- H.I. Antibodies to H. pylori are available from H. pylori.
- Helicobacter pylori refers to an antibody against any of the constituents of the whole cell of H. pylori, ie, the cell component. For example, H.I. If the test for H. pylori is negative but shows symptoms of gastric disease, H.
- H. Detection of antibodies against H. pylori is described in H. pylori. Detection of the Swiss solubilized fraction or the antibody against the protein contained in the solubilized fraction may be performed by the same method.
- H. Whether or not H. pylori is "detected” does not have to be the absolute presence or absence of detection, and may be determined in comparison with other specimens. That is, the presence/absence of detection may be determined based on the measured value instead of based on the ⁇ detection result. That is, in the method of the present invention, the step of "detecting" can be replaced with “measuring” as necessary, and whether or not it is “detected” is determined based on the measured value of the target substance and the negative target. It may be determined in comparison. For example, negative subjects, ie, H. pylori-free specimen or H.
- the target substance is detected in a specimen derived from a subject who is clearly not infected with Helicobacter pylori, if the measured value of the subject is equivalent to that of the negative subject, it is detected in a small amount.
- H.I. pylori is absent or H. pylori infection is determined.
- the subject's measurement is high compared to the negative subject's measurement, it will be labeled as "detected.”
- pylori is present or H. pylori infection is determined. Therefore, it is within the pre-accepted range of the present invention that the method of the present invention accepts a small measured value for subjects that are negative.
- a kit for measuring antibodies to H. pylori is included, the kit comprising at least H. pylori.
- H. pylori antigen may be detected.
- H. Detection of H. pylori antigen also results in detection of H. pylori infection can be detected.
- H. A preferred sample for detecting H. pylori antigens is stool.
- the present invention is a method for detecting H. an antibody against the Swiss solubilized fraction or a protein contained in the solubilized fraction;
- a kit for measuring H. pylori antigen is included, the kit comprising at least H. pylori antigen.
- Example 1 Measurement of human specimen Measurement of anti-H. swiss antibody titer of infected person (human) using ELISA (Enzyme Linked ImmunoSorbent Assay; enzyme immunoassay).
- Swiss medium composition Brucella Broth (BD BBL) 2.8 g Agar powder (BD BBL) 1.5 g Pyruvic acid (Sigma) 0.1 g added when preparing agar medium Skirrow Supplement (2 mL/vial, Oxoid) 0.4 mL Vitox Supplement (10 mL/vial, Oxoid) 2 mL Amphotericin B (0.25 mg/mL) 2 mL Adjust pH to 5 with 0.135 mL of concentrated hydrochloric acid 20 mL of inactivated fetal bovine serum (FBS) Distilled water was added to bring the total volume to 100 mL.
- BD BBL Swiss medium composition Brucella Broth
- BD BBL 2.8 g
- Non-Patent Document 2 9 mL of agar medium was added to a 75 cm 2 flask to prepare a slant medium, and H. spp. Swiss SNTW101c strain (Non-Patent Document 2) was inoculated, 12 mL of liquid medium was added, temperature was 37°C, humidity was 100%, and microaerobic conditions (5% O 2 , 12% CO 2 , 83% N 2 ) were used. Shaking culture was performed for 1 week. After that, the culture medium was centrifuged (13,420 G x 10 minutes) to collect the cells.
- the cells were washed twice with PBS (phosphate buffered saline, pH 7.4), suspended in distilled water, and subjected to sonication for 5 minutes under ice-cold conditions (Bioruptor II ultrasonic cell disruption). 30 seconds of sonication and 5 repetitions of 30 seconds rest on the device (setting High)). The rupture solution was used as "H. suis whole cell suspension", and the supernatant was obtained by centrifugation (30,190 G x 10 minutes) as "H. swiss cell solubilized fraction". For protein quantification, a Bio-Rad Protein Assay kit was used with BSA as a standard protein.
- PBS phosphate buffered saline, pH 7.4
- a blocking solution 1% (V/V) BSA, PBS system pH 7.4
- Blocker BSA bovine serum albumin
- H. pylori-infected persons determined by existing test methods (urea breath test, antibody test, antigen test, etc.), and H. pylori Sera were collected from Swiss-infected subjects (H. suis infection was determined by the real-time PCR method described in Patent Document 2 or culture from the stomach biopsy by preparing DNA from the subject's stomach biopsy).
- H. suis infection was determined by the real-time PCR method described in Patent Document 2 or culture from the stomach biopsy by preparing DNA from the subject's stomach biopsy).
- serum was collected from a healthy subject who had not been infected with any bacteria (non-infected).
- 50 ⁇ L/well of human serum diluted with a blocking solution was added dropwise and left at 37° C. for 1 hour.
- the serum solution was discarded and washed with 200 ⁇ L/well of PBS-T three times.
- Horseradish peroxidase-labeled secondary antibody (Goat anti-Human IgA + IgG + IgM (H + L), Jackson ImmunoResearch, Inc.) diluted 100,000 times with blocking solution was dropped at 50 ⁇ L/well and left at 37 ° C. for 1 hour. The secondary antibody solution was discarded, and washed with 200 ⁇ L/well of PBS-T three times. 50 ⁇ L/well of SuperBlue TMB Microwell Peroxidase Substrate (1-Component), Kirkegaard & Perry Laboratories, Inc.
- Figures 1 and 2 show the results of ELISA using human serum (3600-fold dilution).
- the H. suis positive subject had an absorbance against both the H. suis whole cell and the H. suis solubilized fraction antigens. Higher absorbance was obtained with the Swiss solubilized fraction.
- H.I. H . pylori-infected and non-infected individuals had low absorbance for all antigens. For this reason, H. In human blood infected with Swiss H. that antibodies have been produced against the Swiss solubilized fraction; It was shown for the first time that antibodies can be captured with high sensitivity by using the Swiss solubilized fraction as an antigen. This suggests that H. suis solubilized fractions may be used in humans.
- H. pylori infection as distinct from H. pylori infection. It became clear that highly sensitive diagnosis of Swiss infection was possible.
- Example 2 Measurement of mammalian specimen Measurement of anti-H. swiss antibody titer of infected animals (mice) using ELISA (Enzyme Linked ImmunoSorbent Assay; enzyme immunoassay)
- the cultured H. swiss strain SNTW101c was centrifuged to collected the body. The cells were suspended in PBS, and 4-week-old female C57BL/6 mice were orally infected with 1 ⁇ 10 8 colony forming units (CFU) once.
- CFU colony forming units
- pylori strain SS1 was inoculated on a Nissui plate Helicobacter agar medium and cultured for 3 days under microaerobic conditions (5% O 2 , 12% CO 2 , 83% N 2 ) at a temperature of 37° C. and a humidity of 100%. Colonies were grown in 100 mL of brucella broth (containing 10 mL of inactivated FBS and 0.4 mL of SR0147 Helicobacter pylori Selective Supplement (Dent)) at 37° C., 100% humidity, microaerophilic conditions (5% O 2 , 12%). After culturing with shaking for 3 days in CO 2 , 83% N 2 ), the cells were collected by centrifugation.
- H. DNA was extracted from the gastric mucosa of Swiss-infected mice, and infection was confirmed by PCR. Also, H.I. Helicobacter pylori-infected mouse gastric mucosa suspended in a buffer solution was spread on a Nissui Helicobacter agar medium (Nissui Pharmaceutical Co., Ltd.) and cultured to confirm infection. Sera from H. pylori-infected mice and H. suis-infected mice 4 weeks after the last infection day were collected, respectively. As a control, sera were collected from healthy mice that were not infected with any of these (non-infected).
- H. suis whole cell suspension (4 ⁇ g/mL) or H. suis solubilized fraction (4 ⁇ g/mL) 100 ⁇ L/well dissolved in 0.1 M carbonate-bicarbonate buffer (pH 9.4) was added to 96- Dropped onto a well NUNC ImmunoPlate #439454 and left at 4° C. overnight. The next day, the cell solution was discarded, and the cells were washed with 200 ⁇ L/well of PBS-T three times. 200 ⁇ L/well of a blocking solution (1% BSA, PBS system pH 7.4) prepared from Blocker BSA 10X in PBS (Thermo Scientific) was dropped and left at 37° C. for 1 hour.
- a blocking solution 1% BSA, PBS system pH 7.4
- Blocker BSA 10X in PBS (Thermo Scientific) was dropped and left at 37° C. for 1 hour.
- the blocking solution was discarded, and the cells were washed with 200 ⁇ L/well of PBS-T three times.
- 50 ⁇ L/well of mouse serum diluted with a blocking solution was dropped and left at 37° C. for 1 hour.
- the serum solution was discarded and washed with 200 ⁇ L/well of PBS-T three times.
- Horseradish peroxidase-labeled secondary antibody (Goat Anti-Mouse Ig, Human ads-HRP, SouthernBiotech, Inc.) diluted 100,000-fold with blocking solution was added dropwise at 50 ⁇ L/well and left at 37° C. for 1 hour.
- the secondary antibody solution was discarded, and washed with 200 ⁇ L/well of PBS-T three times.
- FIGS 3 and 4 show the results of ELISA using mouse serum (3600-fold dilution).
- the H. suis positive subject had an absorbance against both the H. suis whole cell and the H. suis solubilized fraction antigens. Higher absorbance was obtained with the Swiss solubilized fraction.
- H.I. H . H. pylori-infected and non-infected mice had low absorbance for both antigens. For this reason, H. H . that antibodies have been produced against the Swiss solubilized fraction; It was shown for the first time that antibodies can be captured with high sensitivity by using the Swiss solubilized fraction as an antigen. This demonstrated that H. suis solubilized fractions could be used to induce H. suis in mice. H. pylori infection as distinct from H. pylori infection. It became clear that highly sensitive diagnosis of Swiss infection was possible.
- Example 3 Measurement of human specimen Measurement of anti-H. pylori antibody titer and anti-H. swiss antibody titer of infected person (human) using ELISA (EnzymeLinked ImmunoSorbent Assay; enzyme immunoassay) (1) H for ELISA . Preparation of H. pylori antigen (solubilized fraction of H. pylori cells)H.
- ELISA EnzymeLinked ImmunoSorbent Assay; enzyme immunoassay
- Non-Patent Document 2 pylori TN2GF4 strain was prepared in brucella broth containing 10% (V/V) fetal calf serum (FCS) at a temperature of 37°C, humidity of 100%, microaerobic conditions (5% O 2 , 10% CO 2 , 85% N 2 ) for 48 hours, and then the culture medium was centrifuged (13,420 G x 10 minutes) to collect the cells. The cells were washed twice with PBS phosphate-buffered saline (pH 7.4), suspended in distilled water, and subjected to sonication for 5 minutes under ice-cold conditions (Bioruptor II ultrasonic cell disruptor).
- FCS fetal calf serum
- Non-Patent Document 2 9 mL of agar medium was added to a 75 cm 2 flask to prepare a slant medium, and H. spp. Swiss SNTW101c strain (Non-Patent Document 2) was inoculated, 12 mL of liquid medium was added, temperature was 37°C, humidity was 100%, and microaerobic conditions (5% O 2 , 12% CO 2 , 83% N 2 ) were used. Shaking culture shaking was performed for one week. After that, the culture medium was centrifuged (13,420 G x 10 minutes) to collect the cells.
- the cells were washed twice with PBS phosphate-buffered saline (pH 7.4), suspended in distilled water, and subjected to sonication for 5 minutes under ice-cold conditions (Bioruptor II ultrasonic cell disruptor). (setting High), sonication for 30 seconds, rest for 30 seconds, repeated 5 times).
- the rupture solution was used as "H. suis whole cell suspension", and the supernatant was obtained by centrifugation (30,190 G x 10 minutes) as "H. swiss cell solubilized fraction”.
- a Bio-Rad Protein Assay kit was used with BSA as a standard protein.
- PBS-T PBS containing 0.05% (V/V) Tween 20
- 200 ⁇ L/well of a blocking solution 1% (V/V) BSA, PBS pH 7.0
- H. pylori-infected persons with symptoms of gastric disease determined by existing test methods (urea breath test, antibody test, antigen test, etc.) and H. pylori patients with symptoms of gastric disease.
- Sera were collected from Swiss-infected subjects (H. suis infection was determined by the real-time PCR method described in Patent Document 2 or culture from the stomach biopsy by preparing DNA from the subject's stomach biopsy). As a control, serum was collected from a healthy subject who had not been infected with any bacteria (non-infected).
- Figures 5 and 6 show the results of ELISA using human serum (3,600-fold dilution).
- H. in the solubilized fraction of H. pylori H. pylori-infected groups (stomach disease-A, B, C, D) showed an absorbance of H. pylori.
- H.I. In the solubilized fraction of Swiss cells H.
- Example 4 Measurement of human specimen Measurement of anti-H. swiss antibody titer of infected person (human) using ELISA (Enzyme Linked ImmunoSorbent Assay; enzyme immunoassay).
- Swiss medium composition Brucella Broth (BD BBL) 2.8 g Agar powder (BD BBL) 1.5 g Pyruvic acid (Sigma) 0.1 g added when preparing agar medium Skirrow Supplement (2 mL/vial, Oxoid) 0.4 mL Vitox Supplement (10 mL/vial, Oxoid) 2 mL Amphotericin B (0.25 mg/mL) 2 mL Adjust pH to 5 with 0.135 mL of concentrated hydrochloric acid 20 mL of inactivated fetal bovine serum (FBS) Distilled water was added to bring the total volume to 100 mL.
- BD BBL Swiss medium composition Brucella Broth
- BD BBL 2.8 g Agar powder (BD BBL) 1.5
- the cells were washed twice with PBS phosphate-buffered saline (pH 7.4), suspended in distilled water, and subjected to sonication for 5 minutes under ice-cold conditions (Bioruptor II ultrasonic cell disruptor). (setting High), sonication for 30 seconds, rest for 30 seconds, repeated 5 times).
- the rupture solution was used as "H. suis whole cell suspension", and the supernatant was obtained by centrifugation (30,190 G x 10 minutes) as "H. swiss cell solubilized fraction”.
- a Bio-Rad Protein Assay kit was used with BSA as a standard protein.
- HsvA antigenic peptides are a part of HsvA (an outer membrane protein specifically present only in H. Switzerland, composed of about 3000 amino acid residues) disclosed in International Publication WO2019/225639. 14 amino acid residues are shown.
- EKKAVQQMENSNPD Peptide No. 11: SEQ ID NO: 1
- EKKAVEQMENSNPD Peptide No. 11 (TKY): SEQ ID NO: 2)
- EKDAVTSLKNSNSG Peptide No. 11 (SH8): SEQ ID NO: 3
- EKDAVTSLENSNSG Peptide No. 11 (SH10): SEQ ID NO: 4
- NQGTLEFLSNDVST Peptide No.
- TNGQEVSASIDYNK Peptide No. 16: SEQ ID NO: 6
- AKLSNFASNDALPD Peptide No. 23: SEQ ID NO: 7
- PTTSSGASPDSSNP Peptide No. 10: SEQ ID NO: 8
- NVDNILNMPSTTSG Peptide No. 20: SEQ ID NO: 9
- TLTLEGTETFAQNS Peptide No. 81: SEQ ID NO: 10
- ADIQSSQTTFANSV Peptide No. 61: SEQ ID NO: 11).
- H. 100 ⁇ L/well of the solubilized fraction of H. pylori cells and HsvA antigen peptide (4 ⁇ g/mL each) was added dropwise to 96-well NUNC ImmunoPlate #468667 and left at 4° C. overnight. The next day, the cell solution was discarded, and the cells were washed three times with 250 ⁇ L/well of PBS-T (PBS containing 0.05% (V/V) Tween 20). 200 ⁇ L/well of a blocking solution (1% (V/V) BSA, PBS pH 7.0) was added dropwise and left at 37° C. for 1 hour. The blocking solution was discarded, and the cells were washed with 250 ⁇ L/well of PBS-T three times.
- PBS-T PBS containing 0.05% (V/V) Tween 20
- 200 ⁇ L/well of a blocking solution 1% (V/V) BSA, PBS pH 7.0
- H. pylori-infected persons determined by existing test methods (urea breath test, antibody test, antigen test, etc.), and H. pylori Sera were collected from Swiss-infected subjects (H. suis infection was determined by the real-time PCR method described in Patent Document 2 or culture from the stomach biopsy by preparing DNA from the subject's stomach biopsy).
- serum was collected from a healthy subject who had not been infected with any bacteria (non-infected).
- the serum solution was discarded and washed with 250 ⁇ L/well of PBS-T three times.
- Horseradish peroxidase-labeled secondary antibody (Goat anti-Human IgG (H+L), Jackson ImmunoResearch, Inc.) was added dropwise at 50 ⁇ L/well and left at 37° C. for 1 hour. The secondary antibody solution was discarded, and washed with 250 ⁇ L/well of PBS-T three times.
- 50 ⁇ L/well of TMB One Component HRP Microwell Substrate, (Surmodics, Inc.) was dropped to develop a blue color, and then 50 ⁇ L/well of 0.17 M sulfuric acid was dropped to change the color to yellow.
- Absorbance at 450 nm reference wavelength: 620 nm to 630 nm
- H. H. pylori infection as distinct from H. pylori infection. Sensitive diagnosis of Swiss infection becomes possible. All publications, patents and patent applications cited herein are hereby incorporated by reference in their entirety.
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Abstract
Description
[1] 少なくともH.スイス可溶化画分、または可溶化画分に含まれる蛋白質および抗Ig抗体を含む、被験体由来の検体のH.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合する抗体を検出する試薬。
[2] 被験体が哺乳動物であることを特徴とする、[1]の試薬。
[3] 検体が血液由来であることを特徴とする、[1]または[2]の試薬。
[4] さらに、H.ピロリの菌体成分またはH.ピロリ菌体成分に対する抗体を含む、被験体由来の検体のH.ピロリと結合する抗体またはH.ピロリ菌体成分の抗原も検出することを特徴とする、[1]~[3]のいずれかの試薬。
[5] ELISAまたはイムノクロマト用試薬である、[1]~[4]のいずれかの試薬。
[6] 以下の工程を含む、被験体由来の検体の抗H.スイス可溶化画分または可溶化画分に含まれる蛋白と結合する抗体を検出することを特徴とする方法:
(a)被験体由来の検体をH.スイス可溶化画分、または可溶化画分に含まれる蛋白質と接触させる工程、および
(b)H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合した、前記検体中の抗体を検出する工程。
[7] 被験体が哺乳動物であることを特徴とする、[6]の方法。
[8] 検体が血液由来であることを特徴とする、[6]または[7]の方法。
[9] さらに、以下の工程を含む、被験体由来の検体のH.ピロリと結合する抗体も検出することを特徴とする、[6]~[8]のいずれかの方法:
(a)被験体由来の検体をH.ピロリ菌体成分と接触させる工程、および
(b)H.ピロリ菌体成分と結合した、前記検体中の抗体を検出する工程。
[10] さらに、以下の工程を含む、被験体由来の検体のH.ピロリ菌体成分の抗原も検出することを特徴とする、[6]~[8]のいずれかの方法:
(a)被験体由来の検体をH.ピロリ菌体成分に対する抗体と接触させる工程、および
(b)H.ピロリ菌体成分に対する抗体と結合した、前記検体中のH.ピロリ菌体成分の抗原を検出する工程。
[11] [1]~[5]のいずれかの試薬を用いた測定および/または[6]~[10]のいずれかの方法により抗体が検出された被験体をH.スイスに感染していると判定する、H.スイスの感染の検出方法。
本明細書は本願の優先権の基礎となる日本国特許出願番号2022-009273号の開示内容を包含する。
本発明は、被験体の生体試料中のH.スイスの可溶化画分、または可溶化画分に含まれる蛋白質に対する抗体を検出する方法、および該抗体を検出する試薬である。本発明は、被験体におけるH.スイスの存在を判定する方法、または被験体のH.スイスの感染の検出方法でもある。あるいは、被験体のH.スイス感染症を診断するための補助的データを取得する方法である。
本明細書において、「H.スイス」とは、50種類以上報告されているヘリコバクター属細菌の中で、NHPH(Non-Helicobacter pylori helicobacters; H.ピロリ以外のヘリコバクター)あるいは、Helicobacter heilmannii sensu lato(広義のヘリコバクター・ハイルマニイ)に含まれるH.スイスの菌種を意味する(非特許文献3)。H.スイスは、ヒト以外にブタ、サル、イノシシ、ネコ、イヌなどの胃に感染することが知られている。本明細書におけるH.スイスが単離された感染哺乳動物は特に限定されるものではなく、例えば、ヒト、サル、イノシシ、またはブタであってよい。
本明細書において、「H.スイス可溶化画分」とは、H.スイスを超音波破砕後にH.スイス菌体外膜断片を除去した画分である。超音波破砕は、H.スイス菌体を緩衝液に懸濁させ超音波破砕機を用いて行うことができる。超音波破砕機としてサンプル密閉型超音波破壊装置 Bioruptor(ビーエム機器)が挙げられる。超音波破砕により、H.スイス菌体は破壊され、菌体外膜断片が残る。菌体外膜断片は、遠心分離やろ過により除去することができる。H.スイス可溶化画分には、蛋白質、糖等が含まれる。「H.スイス可溶化画分に含まれる蛋白質」とは、H.スイスを超音波破砕後にH.スイス菌体外膜断片を除去した画分に含まれるH.スイス由来の蛋白質をいう。
H.スイス可溶化画分に対する抗体は、H.スイス可溶化画分に含まれる蛋白質、糖等の抗原に対する抗体をいい、種々の物質に対する複数の抗体が含まれ得る。本発明において、H.スイス可溶化画分に含まれる蛋白質、糖等の抗原のうち少なくともいずれかの抗原に対する抗体をH.スイス可溶化画分に対する抗体という。また、H.スイス可溶化画分に含まれる蛋白質に対する抗体は、H.スイス可溶化画分に含まれる抗原のうち蛋白質に対する抗体をいう。H.スイス可溶化画分には複数の蛋白質が含まれており、H.スイス可溶化画分に含まれる蛋白質に対する抗体は、種々の蛋白質に対する複数の抗体が含まれ得る。本発明において、H.スイス可溶化画分に含まれる蛋白質のいずれかの蛋白質のうち少なくともいずれかの蛋白質に対する抗体をH.スイス可溶化画分に含まれる蛋白質に対する抗体という。実際には、H.スイスが感染した被験体において、体内でH.スイス菌体が分解された結果、被験体中でH.スイス可溶化画分に対する抗体、または可溶化画分に含まれる蛋白質に対する抗体が産生される。
(a)被験体由来の検体をH.スイス可溶化画分、または可溶化画分に含まれる蛋白質と接触させる工程、
(b)H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合した、前記検体中の抗体を検出する工程、および
(c)H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合した抗体が検出された被験体をH.スイスに感染していると判定し、一方、H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合した抗体が検出されなかった被験体を、H.スイスに感染していないと判定する工程。
(a)被験体由来の検体を、H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と接触させる工程、
(b)H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合した、前記検体中の抗体のレベルを測定する工程、および
(c)測定された抗体のレベルが、同様の方法により陰性対照について測定された抗体のレベルよりも高い場合、該被験体をH.スイスに感染していると判定し、一方、測定された抗体のレベルが、同様の方法により陰性対照について測定された抗体のレベルと同等か低い場合、該被験体を、H.スイスに感染していないと判定する工程。ここで、陰性対象とは、H.スイスに感染していない被験体由来の検体をいう。抗体のレベルとは、抗体の定量値、すなわち抗体価をいい、例えば、検体中の濃度で表される。また、抗体のレベルの測定は、抗体の検出に含まれる。
本発明は同一の被験体においてH.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合する抗体とH.ピロリに対する抗体を検出する方法および該方法にもちいる試薬も包含する。ここで、H.ピロリに対する抗体は、H.ピロリの全菌体のいずれかの構成成分、すなわち菌体成分に対する抗体をいう。例えばH.ピロリの検査で陰性だが胃疾患の症状が示される場合は、H.スイスの感染が原因の可能性が考えられる。同一の被検体からH.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合する抗体とH.ピロリに対する抗体を検出することで、H.ピロリの感染の有無だけではなく、これまでH.ピロリ陰性で見逃されていた被検体に対してもH.スイス感染の確認をすることができる。早期に感染を確認することで、適切な治療方針を定めることができる。同一の被験体由来の検体はH.ピロリとH.スイスで同じであっても、異なってもよい。すなわち、H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合する抗体の検出とH.ピロリに対する抗体の検出は、同じ検体を用いて同時に行ってもよいし、別の時に採取された異なる検体を用いて別途行ってもよい。H.ピロリに対する抗体の検出は、H.スイス可溶化画分、または可溶化画分に含まれる蛋白質に対する抗体の検出と同様の方法で行えばよい。
ELISA(EnzymeLinked ImmunoSorbent Assay ;酵素免疫測定法)を用いた感染者(ヒト)の抗H.スイス抗体価の測定
H.スイス培地の組成
ブルセラブロス(BD BBL) 2.8 g
寒天粉末(BD BBL) 1.5 g 寒天培地作製の場合に加えるピルビン酸(Sigma) 0.1 g
Skirrow Supplement(2 mL/vial, Oxoid) 0.4 mL
Vitox Supplement(10 mL/vial, Oxoid) 2 mL
Amphotericin B(0.25 mg/mL) 2 mL
濃塩酸 0.135 mLによりpHを5に調整
非働化牛胎児血清(FBS) 20 mL
蒸留水を加えて、全量を100 mLとした。
ELISA(EnzymeLinked ImmunoSorbent Assay ;酵素免疫測定法)を用いた感染動物(マウス)の抗H.スイス抗体価の測定
培養したH. スイス SNTW101c株を遠心分離により菌体を集めた。菌体はPBSに懸濁し、4週齢のメスのC57BL/6マウスへ1x108Colony forming unit(CFU)を1回経口感染投与した。一方、-80℃保存のH.ピロリSS1株をニッスイプレートヘリコバクター寒天培地に植菌し、温度37℃,湿度100%,微好気条件(5%O2,12%CO2,83%N2)で3日培養し、生じたコロニーを100 mLのブルセラブロス(10mLの非働化FBSと0.4mLのSR0147 Helicobacter pylori Selective Supplement(Dent)を含む)で温度37℃,湿度100%,微好気条件(5%O2,12%CO2,83%N2)で3日間振とう培養を行った後に、遠心分離により菌体を集めた。菌体はPBSに懸濁し、4週齢のメスのC57BL/6マウスへ2x108 CFUを1日置きに3回経口投与した。H.スイスを感染させたマウス胃粘膜からDNAを抽出し、PCRで感染を確認した。また、H.ピロリを感染させたマウス胃粘膜を緩衝液に懸濁した液をニッスイヘリコバクター寒天培地(日水製薬)に塗布し、培養して感染を確認した。最終感染日から4週間後のH.ピロリ感染マウス、およびH.スイス感染マウスからの血清をそれぞれ採取した。また対照として、いずれにも感染していない健常なマウスからの血清を採取した(非感染)。
ELISA(EnzymeLinked ImmunoSorbent Assay ;酵素免疫測定法)を用いた感染者(ヒト)の抗H.ピロリ抗体価および抗H.スイス抗体価の測定
(1)ELISA用H.ピロリ抗原(H.ピロリ菌体可溶化画分)の調製
H.ピロリ TN2GF4株(非特許文献2)は、10%(V/V)牛胎児血清(FCS)を含むブルセラブロスで温度37℃、湿度100%、微好気条件(5%O2、10%CO2、85%N2)で48時間振とう培養を行った後で、培養液を遠心分離(13,420 G x 10分間)により菌体を集めた。菌体はPBSリン酸緩衝生理食塩水、pH7.4)で2回洗浄後、蒸留水に懸濁し、氷冷条件下で5分間の超音波破砕処理を行った(Bioruptor II超音波細胞破壊装置(設定High)で、30秒間の音波処理と30秒間の休止を5回繰り返す)。破壊液を「H.ピロリ全菌体懸濁液」とし、遠心分離(30,190 G x 10分間)により上清を「H.ピロリ菌体可溶化画分」とした。蛋白質の定量には、BSAを標準蛋白質としてBio-Rad Protein Assayキットを用いた。
H.スイス培地の組成
ブルセラブロス(BD BBL) 2.8 g
寒天粉末(BD BBL) 1.5 g 寒天培地作製の場合に加えるピルビン酸(Sigma) 0.1 g
Skirrow Supplement(2 mL/vial, Oxoid) 0.4 mL
Vitox Supplement(10 mL/vial, Oxoid) 2 mL
Amphotericin B(0.25 mg/mL) 2 mL
濃塩酸 0.135 mLによりpHを5に調整
非働化牛胎児血清(FBS) 20 mL
蒸留水を加えて、全量を100 mLとした。
ELISA(EnzymeLinked ImmunoSorbent Assay ;酵素免疫測定法)を用いた感染者(ヒト)の抗H.スイス抗体価の測定
H.スイス培地の組成
ブルセラブロス(BD BBL) 2.8 g
寒天粉末(BD BBL) 1.5 g 寒天培地作製の場合に加えるピルビン酸(Sigma) 0.1 g
Skirrow Supplement(2 mL/vial, Oxoid) 0.4 mL
Vitox Supplement(10 mL/vial, Oxoid) 2 mL
Amphotericin B(0.25 mg/mL) 2 mL
濃塩酸 0.135 mLによりpHを5に調整
非働化牛胎児血清(FBS) 20 mL
蒸留水を加えて、全量を100 mLとした。
EKKAVQQMENSNPD(ペプチドNo.11:配列番号1)、
EKKAVEQMENSNPD(ペプチドNo.11(TKY):配列番号2)、
EKDAVTSLKNSNSG(ペプチドNo.11(SH8):配列番号3)、
EKDAVTSLENSNSG(ペプチドNo.11(SH10):配列番号4)、
NQGTLEFLSNDVST(ペプチドNo.19(TKY):配列番号5)、
TNGQEVSASIDYNK(ペプチドNo.16:配列番号6)、
AKLSNFASNDALPD(ペプチドNo.23:配列番号7)、
PTTSSGASPDSSNP(ペプチドNo.10:配列番号8)、
NVDNILNMPSTTSG(ペプチドNo.20:配列番号9)、
TLTLEGTETFAQNS(ペプチドNo.81:配列番号10)、及び
ADIQSSQTTFANSV(ペプチドNo.61:配列番号11)。
本明細書で引用した全ての刊行物、特許及び特許出願はそのまま引用により本明細書に組み入れられるものとする。
Claims (11)
- 少なくともH.スイス可溶化画分、または可溶化画分に含まれる蛋白質および抗Ig抗体を含む、被験体由来の検体のH.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合する抗体を検出する試薬。
- 被験体が哺乳動物であることを特徴とする、請求項1記載の試薬。
- 検体が血液由来であることを特徴とする、請求項1または2に記載の試薬。
- さらに、H.ピロリの菌体成分またはH.ピロリ菌体成分に対する抗体を含む、被験体由来の検体のH.ピロリと結合する抗体またはH.ピロリ菌体成分の抗原も検出することを特徴とする、請求項1~3のいずれか1項に記載の試薬。
- ELISAまたはイムノクロマト用試薬である、請求項1~4のいずれか1項に記載の試薬。
- 以下の工程を含む、被験体由来の検体の抗H.スイス可溶化画分または可溶化画分に含まれる蛋白質と結合する抗体を検出することを特徴とする方法:
(a)被験体由来の検体をH.スイス可溶化画分、または可溶化画分に含まれる蛋白質と接触させる工程、および
(b)H.スイス可溶化画分、または可溶化画分に含まれる蛋白質と結合した、前記検体中の抗体を検出する工程。 - 被験体が哺乳動物であることを特徴とする、請求項6記載の方法。
- 検体が血液由来であることを特徴とする、請求項6または7に記載の方法。
- さらに、以下の工程を含む、被験体由来の検体のH.ピロリと結合する抗体も検出することを特徴とする、請求項6~8のいずれか1項に記載の方法:
(a)被験体由来の検体をH.ピロリ菌体成分と接触させる工程、および
(b)H.ピロリ菌体成分と結合した、前記検体中の抗体を検出する工程。 - さらに、以下の工程を含む、被験体由来の検体のH.ピロリ菌体成分の抗原も検出することを特徴とする、請求項6~8のいずれか1項に記載の方法:
(a)被験体由来の検体をH.ピロリ菌体成分に対する抗体と接触させる工程、および
(b)H.ピロリ菌体成分に対する抗体と結合した、前記検体中のH.ピロリ菌体成分の抗原を検出する工程。 - 請求項1~5のいずれか1項に記載の試薬を用いた測定および/または請求項6~10のいずれか1項に記載の方法により抗体が検出された被験体をH.スイスに感染していると判定する、H.スイスの感染の検出方法。
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