WO2010104025A1 - 筋変性疾患の検出方法、及び治療効果判定方法 - Google Patents
筋変性疾患の検出方法、及び治療効果判定方法 Download PDFInfo
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- 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
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- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
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- G01N2800/00—Detection or diagnosis of diseases
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Definitions
- the present invention relates to a method for early detection of a muscle degenerative disease and a method for predicting and / or judging a therapeutic agent and / or a therapeutic method.
- myopathy A group of diseases accompanied by myopathy or myonecrosis is called myopathy.
- Typical diseases include muscular dystrophy and muscular atrophy.
- Muscular dystrophy is a generic name for inherited diseases in which muscles gradually weaken and muscles atrophy. Among them, progressive muscular dystrophy has the largest number of patients and is hereditary and causes progressive muscle weakness.
- Muscle atrophy is a neurogenic disease caused by motor nerve disorders.
- Duchenne muscular dystrophy the most common type of muscular dystrophy, is a disease that occurs only in boys due to sex-chromosomal recessive inheritance. . Usually, around 3-5 years old, abnormalities related to walking and standing, such as being unable to run and falling easily, appear and become unable to walk around 10 years old. Later, spinal deformities and joint contractures progress rapidly, often causing respiratory failure, sometimes heart failure, and pneumonia.
- Tests for diagnosing muscular dystrophy include blood tests, nerve conduction tests, electromyograms, muscle biopsies, and DNA analysis.
- the nerve conduction test is a test to check whether the cause of movement disorder or sensory disorder is due to peripheral neuropathy, and the site and extent of the disorder, and measures the speed at which stimulation is transmitted by electrically stimulating the nerve. Due to the nature of the test, a special device is required, and the nerves are directly electrically stimulated.
- the electromyogram is an examination to check whether the movement disorder is derived from muscle or nerve, and the site and extent of the disorder. It requires a special device and is accompanied by pain caused by inserting a needle into the muscle. There is a painless electromyogram of the body surface, but it is forced to be restrained in the laboratory for measurement.
- muscle biopsy requires the collection of muscle tissue, it is not an invasive and simple test.
- DNA analysis is essential for the diagnosis of Duchenne or Becker muscular dystrophy caused by mutations in the dystrophin gene, but it is not applicable as a muscle degenerative disease and lacks versatility.
- Creatine kinase is a common blood test. Creatine kinase is an enzyme mainly present in the soluble fraction of skeletal muscle and cardiac muscle, and leaks into the blood due to cell damage. In muscular dystrophy, skeletal muscle is damaged and necrotic, so it is diagnosed because blood creatine kinase shows a significantly high level.But blood creatine kinase level may also be high in other diseases, so this concentration alone Differential diagnosis is difficult, and other tests are performed at the same time.
- Blood creatine kinase is also measured as a blood test in other progressive muscular dystrophy diseases and diseases in which muscles are damaged or necrotic due to neurological abnormalities. Not so, other markers of muscle damage or necrosis are needed.
- Tetranor-PGDM 11,15-Dioxo-9 ⁇ -hydroxy-2,3,4,5-tetranorprostan-1,20-dioic acid
- PGD 2 prostaglandin D 2
- HPGDS hematopoietic prostaglandin D synthase
- Tetranor-PGDM is detected at a high concentration as urinary excretion in patients with muscle degenerative diseases, and the Tetranor-PGDM concentration is significantly decreased by administration of an HPGDS inhibitor.
- An object of the present invention is to provide a method for efficiently diagnosing myopathic diseases by measuring urinary Tetranor-PGDM, and a method for determining the therapeutic effects of these diseases and / or therapeutic methods. It is.
- an object of the present invention is to provide a diagnostic kit for muscular degenerative diseases characterized by targeting Tetranor-PGDM.
- Tetranor-PGDM a urinary PGD 2 metabolite
- muscular dystrophy model animals compared to normal animals.
- urinary excretion of Tetranor-PGDM decreased.
- the present invention provides the following method for detecting a muscle degenerative disease, a diagnostic measurement kit for a muscle degenerative disease, and a kit for predicting and / or determining the effect of a therapeutic agent and / or treatment method for a muscle degenerative disease.
- Item 1 A method for detecting a muscle degenerative disease, comprising a step of measuring the content of Tetranor-PGDM in a specimen separated from a subject.
- Item 2. A method for determining the effect of a therapeutic agent and / or therapeutic method for a muscle degenerative disease, comprising a step of measuring the content of Tetranor-PGDM in a specimen separated from a patient with a muscle degenerative disease.
- Item 3. Item 3. The method according to Item 1 or 2, wherein the specimen is urine.
- Tetranor-PGDM can be measured by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS / MS), enzyme immunoassay (EIA), radioimmunoassay (RIA), fluorescence immunoassay (FIA), and ELISA Item 4.
- HPLC-MS / MS high performance liquid chromatography-tandem mass spectrometry
- EIA enzyme immunoassay
- RIA radioimmunoassay
- FIA fluorescence immunoassay
- ELISA Item 4 The method according to any one of Items 1 to 3, which is performed by an ELISA method or an enzymatic method.
- Item 1 or 2 wherein the muscle degenerative disease is progressive muscular dystrophy, congenital muscular dystrophy, limb-girdle muscular dystrophy, facial scapulohumeral muscular dystrophy, myotonic muscular dystrophy, amyotrophic lateral sclerosis, or myopathy The method described in 1.
- a diagnostic measurement kit for a muscle degenerative disease comprising an antibody against Tetranor-PGDM.
- Item 7. A kit for predicting and / or determining the effect of a therapeutic agent and / or therapeutic method for muscle degenerative diseases, comprising an antibody against Tetranor-PGDM.
- Item 8. Antibodies against Tetranor-PGDM, labeled Tetranor-PGDM, further anti-immunoglobulin antibodies as necessary, specimen dilutions, dilutions of antibodies or labeled Tetranor-PGDM, standard concentrations of Tetranor-PGDM, substrates for EIA, Item 8.
- Tetranor-PGDM by measuring Tetranor-PGDM in a sample separated from a subject, it is possible to diagnose muscle degenerative diseases easily and early, and further, the therapeutic effect of therapeutic agents and / or therapeutic methods for these diseases. It can be determined effectively.
- Tetranor-PGDM that increases in urine as a marker
- it can be used as a diagnostic kit that can easily diagnose these diseases.
- FIG. 1 It is a figure which shows the change of the urinary Tetranor-PGDM density
- the figure on the left shows the change in urinary Tetranor-PGDM concentration when the HPGDS inhibitor was administered for about 1 year and then switched to the solvent administration, and the figure on the right shows that the solvent was administered for about 1 year after a view showing a change in Tetranor-PGDM concentration in urine of the inhibitor muscular dystrophy dog when switching the administration (CXMD J).
- muscle degenerative diseases can be diagnosed using Tetranor-PGDM as an index, and the therapeutic effects of therapeutic agents and / or treatment methods for these diseases can be determined effectively. Furthermore, by using Tetranor-PGDM as a marker, it is possible to provide a kit for diagnosing these diseases, and a kit for predicting and / or determining the effects of therapeutic agents and / or therapeutic methods for myopathic diseases.
- Tetranor-PGDM by measuring Tetranor-PGDM in a sample isolated from a subject suffering from or possibly suffering from a muscle degenerative disease, a disease associated with muscle damage or myonecrosis is detected. Can be detected or diagnosed. Specifically, when the concentration or content of Tetranor-PGDM in a specimen is higher than a predetermined value, it can be diagnosed as a myodegenerative disease.
- the predetermined value of Tetranor-PGDM in the specimen separated from the subject can be determined by measuring the Tetranor-PGDM of the specimen of a healthy person and the specimen of a patient with myopathy.
- the therapeutic drug and / or the method of determining the effect of the therapeutic method are Tetranor-PGDM in the specimen before the start of treatment / before the start of treatment treatment for patients with muscle degenerative diseases, and Tetranor after the start of treatment / after the start of treatment treatment treatment.
- -Comparison of measured values of PGDM, treatment or therapeutic drug administration is effective if the measured value of Tetranor-PGDM in the sample is significantly or significantly lower after the start of treatment / after the start of treatment administration If there is no significant difference in the measured value of Tetranor-PGDM in the sample before and after the start of treatment / therapeutic drug administration and there is no significant trend, the treatment / treatment method is not effective. Determined.
- a diagnostic kit using an antibody capable of detecting Tetranor-PGDM in a specimen can be provided.
- the subject in the present invention includes mammals such as humans, monkeys, cows, horses, rats, mice, guinea pigs, rabbits, dogs, cats, sheep, goats, and the like, preferably humans.
- Tetranor-PGDM measured by the method of the present invention is found as a urinary metabolite of PGD 2 . Tetranor-PGDM is also found in blood and feces.
- the specimen separated from the subject in the present invention is preferably urine, feces, blood, plasma, serum, and more preferably urine.
- measuring Tetranor-PGDM includes both detecting Tetranor-PGDM in a specimen and measuring its expression level, and whether or not the expression level is a predetermined value or more. In other words, in other words, the case where the expression is detected when the expression level is a predetermined value or more is also included.
- Tetranor-PGDM can be measured by GC-MS, HPLC, high performance liquid chromatography-tandem mass spectrometry (HPLC-MS / MS), enzyme immunoassay (EIA), radioimmunoassay (RIA), Examples include fluorescence immunoassay (FIA), ELISA (ELISA), enzyme method, etc.
- High-performance liquid chromatography-tandem mass spectrometry HPLC-MS / MS
- anti-Tetranor-PGDM antibody due to its ease of operation
- immunoassay methods using enzyme especially enzyme immunoassay (EIA), radioimmunoassay (RIA), fluorescent immunoassay (FIA), ELISA (ELISA), especially enzyme immunoassay (EIA) or ELISA
- EIA enzyme immunoassay
- RIA radioimmunoassay
- FIA fluorescent immunoassay
- ELISA enzyme immunoassay
- EIA enzyme immunoassay
- EIA enzyme immunoassay
- RIA radioimmunoassay
- FIA fluorescent immunoassay
- ELISA ELISA
- EIA enzyme immunoassay
- EIA enzyme immunoassay
- muscle degenerative diseases include progressive muscular dystrophy, congenital muscular dystrophy, limb-girdle muscular dystrophy, facial scapulohumeral muscular dystrophy, myotonic muscular dystrophy, amyotrophic lateral sclerosis, myopathy, fleshy, cardiomyopathy (Myocardial infarction), diabetic peripheral vascular disorder (vascular smooth muscle disorder), etc. are exemplified, preferably progressive muscular dystrophy, congenital muscular dystrophy, limb-girdle muscular dystrophy, facial scapulohumeral muscular dystrophy, myotonicity These are muscular dystrophy and amyotrophic lateral sclerosis, such as muscular dystrophy.
- the therapeutic agent that can determine the therapeutic effect of a muscle degenerative disease is not particularly limited and can be any therapeutic agent, such as hematopoietic prostaglandin D synthase (HPGDS) inhibitor, prostaglandin.
- HPGDS hematopoietic prostaglandin D synthase
- Examples thereof include gin D receptor antagonists, preferably hematopoietic prostaglandin D synthase (HPGDS) inhibitors.
- the concentration measurement of Tetranor-PGDM in a sample is preferably performed by an immunoassay because a large amount of sample can be easily measured simultaneously.
- anti-Tetranor-PGDM antibodies examples include polyclonal antibodies and monoclonal antibodies with respect to antibodies.
- Tetranor-PGDM may be administered to animals (rats, mice, guinea pigs, rabbits, dogs, cats, sheep, goats, etc.) and immunized to produce polyclonal or monoclonal antibodies.
- PGDM bovine serum albumin
- globulin globulin
- thyroglobulin hemocyanin
- hemocyanin etc.
- animals rat, mouse, guinea pig, rabbit, dog, cat
- a polyclonal antibody or a monoclonal antibody can be obtained by administering to a sheep, a goat, etc.) at an administration interval, collecting the serum of the animal after a predetermined period of time, and processing it by a known method.
- Monoclonal antibody is specifically a monoclonal antibody-producing cell obtained from the spleen by immunizing an animal using Tetranor-PGDM, which was used in the preparation of the polyclonal antibody, combined with an appropriate protein as necessary, as an immunogen. And myeloma cells can be produced by a hybridoma prepared by cell fusion.
- Hybridoma can be obtained by the following method. Tetranor-PGDM alone or its protein conjugate obtained as described above, together with Freund's complete adjuvant, is divided into several times, to appropriate mammals such as mice, rats, rabbits, etc. every 2-3 weeks. Immunize by intraperitoneal or intravenous or subcutaneous administration. Next, antibody-producing cells derived from the spleen and the like are fused with tumor cells that can grow in vitro such as myeloma cells. As a fusion method, it can be carried out with polyethylene glycol according to the usual method of Kohler and Milstein (Nature, vol. 256, 495 (1975)), or with Sendai virus.
- a Tetranor-PGDM immunoassay is performed.
- This immunoassay is preferably performed by a well-known competitive immunoassay for Tetranor-PGDM as the substance to be measured.
- Enzyme immunoassay EIA
- fluorescent immunoassay fluorescent immunoassay
- luminescence immunoassay classified by labeling substance And radioimmunoassay (RIA).
- RIA radioimmunoassay
- labeled antigen is used in the competition method.
- the labeling substance include enzymes, fluorescent substances, luminescent substances, and radioisotopes.
- the method for binding the labeling substance and the antigen can be produced using a known method for making a covalent bond or a non-covalent bond.
- the binding method include a method of creating a covalent bond using a condensing agent, a method of using various cross-linking agents, etc. (see, for example, “Protein Nucleic Acid Enzyme”, Supplement 31, pages 37 to 45 (1985)).
- functional groups present in the antigen can be used.
- a functional group such as a thiol group, amino group, carboxyl group or hydroxyl group is introduced by a conventional method, and then a labeled antigen is produced by the binding method.
- a labeled antigen is produced by the binding method.
- the noncovalent bonding method include a physical adsorption method.
- Tetranor-PGDM is preferably measured by, for example, the immunoassay described below.
- a labeled antigen that is bound or not bound to the antibody by competitively reacting with a predetermined amount of labeled Tetranor-PGDM, anti-Tetranor-PGDM antibody, or a specimen containing Tetranor-PGDM (particularly a urine specimen). Quantify Tetranor-PGDM in the specimen from the amount.
- anti-immunoglobulin antibody Separation from labeled antigen that did not bind to the labeled antigen that was bound to the antibody, added anti-immunoglobulin antibody, (labeled antigen)-(anti-Tetranor-PGDM antibody)-(anti-immunoglobulin antibody) It can be carried out by precipitating and separating the complex and measuring the labeling substance bound to the complex or the labeling substance not bound. This method is called a two-antibody method, and can also be carried out by a method using a charcoal filter.
- the anti-immunoglobulin antibody is also carried out by measuring an anti-immunoglobulin antibody bound to a solid phase, a labeled substance bound to the solid phase, or a labeled substance not bound.
- the anti-immunoglobulin antibody can be bound to the solid phase by a well-known method such as a physical adsorption method, a chemical binding method using a crosslinking agent or a covalent bond, a binding method using an avidin-biotin bond, or the like.
- the labeling substance is selected in accordance with the labeling substance.
- the kit of the present invention contains an anti-Tetranor-PGDM antibody, and in a more preferred embodiment, contains a labeled Tetranor-PGDM or anti-Tetranor-PGDM antibody.
- the kit includes EIA kits such as anti-immunoglobulin antibody that binds to anti-Tetranor-PGDM antibody, specimen diluent, diluted antibody or labeled Tetranor-PGDM, standard Tetranor-PGDM of known concentration, etc. Substrate, stop solution, etc. can be added.
- Specimens for measuring Tetranor-PGDM used in the present invention include urine collected from humans in particular.
- the measured value of Tetranor-PGDM in the specimen (particularly urine) before and after administration of the therapeutic agent is compared.
- the sample may be a sample that accumulates urine for one day, or measurement can be performed using the collected sample as it is.
- the collected urine may be stored at room temperature, but is preferably stored at a low temperature until it is used for measurement.
- Tetranor-PGDM contained in the sample may be measured based on the total amount of the collected sample, or a part of the collected sample may be measured in consideration of correction by a reference material such as creatinine. Good.
- the Tetranor-PGDM contained in the specimen is measured in consideration of correction by creatinine for a part of the collected specimen.
- the specimen is urine
- Tetranor-PGDM measurement is based on Tetranor-PGDM concentration in the urine of the patient before treatment treatment, under treatment management with treatment administration. -If the value of the PGDM concentration decreases with a significant or significant tendency from this predetermined value, it is determined that the therapeutic agent or therapeutic method is effective, and the therapeutic method or therapeutic agent administration is continued. If the value of Tetranor-PGDM concentration in urine does not decrease significantly or significantly, it is determined that the therapeutic method or therapeutic agent is not effective, and another therapeutic agent or therapeutic method is attempted.
- Example 1 Materials and methods (1) Materials and specimens The following animals were used as muscular dystrophy model animals. Muscular dystrophy mouse: mdx (C57Bl / 10 ScSn, source: JAX Laboratories) Muscular dystrophy dog: CXMD J (CXMDJ, source: National Center for Psychiatry and Neurology) Moreover, the animal of the same strain was used as a comparative control animal. Wild-type mouse (C57BL / 10 ScSn, source: JAX Laboratories) Normal beagle dog (source: National Psychiatry & Neurology Center)
- Test compound 1 available as a known hematopoietic prostaglandin D synthase (HPGDS) inhibitor as test compound: 4-benzhydryloxy-1- ⁇ 3- (1H-tetrazole -5-yl) -propyl ⁇ piperidine (Jpn. J. Pharmacol., 78, 1-10 (1998)), test compound 2; N-methoxy-N-methyl-4- (5-benzoylbenzimidazole-2- Ile-3,5-dimethylpyrrole-2-carboxamide (International Publication WO2007007778) was used.
- HPGDS hematopoietic prostaglandin D synthase
- Tetranor-PGDM-d6 (Cayman Chemical), which is a deuterium label of Tetranor-PGDM, as an internal standard.
- the volume was adjusted to 2 mL with purified water and the pH was adjusted to 3.
- Urine was injected into a Sep-Pak Vac C18 cartridge (Waters) previously equilibrated with 5 mL of acetonitrile and 5 mL of purified water.
- the extract was washed with 5 mL of a 10% acetonitrile solution prepared with purified water and 10 mL of hexane, eluted with 5 mL of ethyl acetate, and dried under a nitrogen stream. The residue was dissolved in 100 ⁇ L of a 10% acetonitrile solution prepared with purified water to obtain a measurement sample.
- Tetranor-PGDM The amount of Tetranor-PGDM was measured using the pretreated urine sample.
- Prominence system system controller-CBM-20A, 2 liquid delivery units LC-20AD, online degasser DGU-20A 3 , column oven CTO-20A, autosampler with cooling function SIL-20AC, manufactured by Shimadzu Corporation
- the flow rate was 0.2 mL / min with a concentration gradient of 0.2% formic acid or 0.01% to 0.2% acetic acid and acetonitrile or acetonitrile / methanol (90:10).
- the column oven was set at 37 ° C, and the autosampler was set at 4 ° C.
- the MS / MS section used a triple quadrupole mass spectrometer (4000 Q TRAP LC / MS / MS system, Applied Biosystems) using electrospray ionization as the ion source.
- MRM Multiple Reaction Monitoring
- MRM Multiple Reaction Monitoring
- the parent ion of the target molecule is generated by electrospray ionization, the parent ion is separated by the first mass analyzer (Q1), and the parent ion is detected by CID (collision-induced dissociation) in the collision part (Q2) In the second mass analyzer (Q3), the fragment ions are separated, and the fragment ions are detected by the downstream detection unit.
- Tetranor-PGDM mass number 328 is detected by further decomposing the generated m / z (mass number ⁇ charge) 327 ion by CID (collision-induced dissociation) and generating any of the product ions m / z 155, 143, and 109 It was done using.
- the internal standard Tetranor-PGDM-d6 (mass number 334) is detected by further decomposing the generated m / z (mass number ⁇ charge) 333 ions by CID (collision-induced dissociation) and generating product ions m / z161, 149 , 109 was used. Data analysis was performed using Analyst Version 1.4.1 attached to MS / MS. From the prepared mass chromatogram, the area of Tetranor-PGDM-derived peaks was calculated, and each peak was quantified from a calibration curve prepared using a standard sample. In quantification, correction was performed using the area value of the Tetranor-PGDM-d6-derived peak introduced as an internal standard in order to correct the extraction efficiency and ionization efficiency for each analysis.
- Symptom evaluation For evaluation of symptoms in mdx mice, the grip strength of the forelimbs was measured using a mouse grip strength measuring device (traction meter, manufactured by Brain Science Idea). One measurement was performed within 2 minutes, and the average value in 5 trials was calculated.
- CXMD J showed a high urinary Tetranor-PGDM concentration Compared with normal dogs, CXMD J , a muscular dystrophy model dog, showed a high urinary Tetranor-PGDM concentration, and CXMD J administered test compound 2 The urinary Tetranor-PGDM concentration decreased (Table 1). This result indicates that the urinary Tetranor-PGDM concentration is a urinary marker associated with the onset of muscular dystrophy symptoms.
- Urinary Tetranor-PGDM concentration in CXMD J decreased with HPGDS inhibitor administration
- CXMD J which was switched to solvent administration
- the symptom score was exacerbated.
- CXMD J which was switched to inhibitor administration
- This result shows that the fluctuation of urinary Tetranor-PGDM concentration can be an effect determination marker or a predictive marker by administration of a therapeutic agent for muscular dystrophy.
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Abstract
Description
1)正常動物に比較して、尿中PGD2代謝物であるTetranor-PGDMが、筋ジストロフィーモデル動物において増加していた。
2)筋ジストロフィーモデル動物に、公知のPGD2合成酵素阻害剤を投与することにより、Tetranor-PGDMの尿中排泄量が減少した。
項1. 被験体から分離した検体中のTetranor-PGDM含量を測定する工程を含む、筋変性疾患の検出方法。
項2. 筋変性疾患の患者から分離した検体中のTetranor-PGDM含量を測定する工程を含む、筋変性疾患に対する治療薬及び/又は治療方法の効果判定方法。
項3. 前記検体が尿である、項1又は2に記載の方法。
項4. Tetranor-PGDMの測定が、高速液体クロマトグラフィー-タンデムマススペクトロメトリー法(HPLC-MS/MS)、酵素免疫測定法(EIA)、放射性免疫測定法(RIA)、蛍光免疫測定法(FIA)、エライザ法(ELISA)または酵素法により行われる、項1~3のいずれかに記載の方法。
項5. 筋変性疾患が進行性筋ジストロフィー症、先天性筋ジストロフィー症、肢帯型筋ジストロフィー症、顔面肩甲上腕型筋ジストロフィー症、筋強直性筋ジストロフィー症、筋萎縮性側索硬化症またはミオパチーである、項1又は2に記載の方法。
項6. Tetranor-PGDMに対する抗体を含むことを特徴とする筋変性疾患の診断測定用キット。
項7. Tetranor-PGDMに対する抗体を含むことを特徴とする筋変性疾患の治療薬及び/又は治療方法の効果予測及び/又は判定用キット。
項8. Tetranor-PGDMに対する抗体、標識されたTetranor-PGDM、必要に応じてさらに抗イムノグロブリン抗体、検体希釈液、抗体ないし標識Tetranor-PGDMの希釈液、既知濃度の標準Tetranor-PGDM、EIA用の基質、EIA用の停止液からなる群から選ばれる少なくとも1種を含む項6又は7に記載のキット。
本発明における被験体から分離した検体とは、好ましくは尿、糞便、血液、血漿、血清であり、より好ましくは尿である。
実施例1
1.材料及び方法
(1)材料および検体
筋ジストロフィーモデル動物として、以下の動物を使用した。
筋ジストロフィーマウス:mdx (C57Bl/10 ScSn、入手先:JAX Laboratories)
筋ジストロフィー犬 :CXMDJ(CXMDJ、入手先:国立精神・神経センター)
また、比較対照動物として同系統の動物を使用した。
Wild-type マウス(C57BL/10 ScSn、入手先:JAX Laboratories)
正常ビーグル犬(入手先:国立精神・神経センター)
被験化合物として、公知の造血器型プロスタグランジンD合成酵素(HPGDS)阻害剤として入手可能な、被験化合物1;4-ベンズヒドリルオキシ-1-{3-(1H-テトラゾール-5-イル)-プロピル}ピペリジン(Jpn. J. Pharmacol., 78, 1-10 (1998))、被験化合物2;N-メトキシ-N-メチル-4-(5-ベンゾイルベンゾイミダゾール-2-イル-3,5-ジメチルピロール-2-カルボキサミド(国際公開WO2007007778号公報)を用いた。
4週齢のmdxマウスを用いて、溶媒(0.5% メチルセルロース溶液)あるいは被験化合物1を30mg/kgの用量で5日間経口投与した。被験化合物1の投与開始前および投与5日後の尿は、マウス用代謝ケージを用いて約12時間採取した。また、比較対照として同週齢の同系統wild-typeマウスから尿を採取した。尿中クレアチニン濃度は測定キット(Lタイプワコー CRE・M、和光純薬)を用いて行った。
CXMDJに溶媒(0.5% メチルセルロース溶液)あるいは被験化合物2を約1年間経口投与した後、溶媒投与犬には被験化合物2を、また被験化合物2投与犬には溶媒投与を開始した。溶媒投与から被験化合物2投与への切り替え前に、被験化合物2投与から溶媒投与への切り替え前にそれぞれ尿を採取した。また、投与液を切り替え後は経時的に尿を採取した。また、比較対照として正常ビーグル犬から尿を採取した。
採取したマウスあるいは犬の尿200μLに、内部標準としてTetranor-PGDMの重水素標識体であるTetranor-PGDM-d6(Cayman Chemical社)5ngを混合した。精製水で容量を2mLとし、pHを3に調整した。あらかじめアセトニトリル5mLおよび精製水5mLで平衡化したSep-Pak Vac C18カートリッジ(Waters)に尿を注入した。精製水で調製した10%アセトニトリル溶液5mLおよびヘキサン10mLで洗浄後、酢酸エチル5mLで溶出させ、窒素気流下で乾固した。残渣を精製水で調製した10%アセトニトリル溶液100μLに溶解し、測定サンプルとした。
前処理後の尿サンプルを用いて、Tetranor-PGDM量を測定した。測定には高速液体クロマトグラフィー-タンデムマススペクトロメトリー(HPLC-MS/MS)装置を使用した。HPLC装置として、Prominence system(システムコントローラ―CBM-20A、送液ユニットLC-20AD2台、オンライン脱気装置DGU-20A3、カラムオーブンCTO-20A、冷却機能付きオートサンプラーSIL-20AC、島津製作所製)、ガードカラムとしてInertsilODS3、内径2.1mm×長さ50mm(GLサイエンス社製)を、分離カラムにはInertsilODS3、内径2.1mm×長さ250mm(GLサイエンス社製)を使用し、移動相は0.01%~0.2%蟻酸あるいは0.01%~0.2%酢酸と、アセトニトリルあるいはアセトニトリル/メタノール(90:10)の濃度勾配で流速は0.2mL/minとした。カラムオーブンは37℃、オートサンプラーは4℃に設定した。MS/MS部はエレクトロスプレーイオン化をイオン源とする3連四重極型質量分析装置(4000 Q TRAP LC/MS/MS system、アプライドバイオシステムズ社製)を用いた。定量法としてはMRM (Multiple Reaction Monitoring)法を用いた。本法は、親イオン(プレカーサーイオン)とCID(衝突誘起解離)により生じたフラグメントイオンの質量から、真の親イオンのみを特異的に選択し、その面積から親イオンを正確に定量する方法であり、すなわちエレクトロスプレーイオン化法により目的分子の親イオンを生成し、1番目の質量分析器(Q1)で当該親イオンを分離し、衝突部(Q2)ではCID(衝突誘起解離)により当該親イオンに特徴的なフラグメントイオンを生成し、さらに2番目の質量分析器(Q3)では当該フラグメントイオンを分離し、その下流の検出部で当該フラグメントイオンを検出する。Tetranor-PGDM(質量数328)の検出は生成したm/z(質量数÷電荷)327のイオンをさらにCID(衝突誘起解離)によって分解し、生成するプロダクトイオンm/z155、143、109のいずれかを用いて行った。内部標準Tetranor-PGDM-d6(質量数334)の検出は生成したm/z(質量数÷電荷)333のイオンをさらにCID(衝突誘起解離)によって分解し、生成するプロダクトイオンm/z161、149、109のいずれかを用いて行った。データ解析はMS/MSに付属するソフトウェアAnalyst Version 1.4.1を用いて行った。作成されたマスクロマトグラムから、Tetranor-PGDM由来のピークについて面積計算を行い、標準試料を用いて作成した検量線より各ピークの定量を行った。定量の際には、分析毎の抽出効率およびイオン化効率を補正するために内部標準として導入したTetranor-PGDM-d6由来ピークの面積値を用いて補正を行った。
mdxマウスでの症状評価として、マウス用握力測定装置(トラクションメーター、ブレインサイエンスイデア製)を用いて前肢の握力を測定した。1回の測定を2分以内に行い、5回の試行における平均値を算出した。
(1)mdxマウスで尿中Tetranor-PGDM濃度は高値を示す
尿中クレアチニン濃度で補正したTetranor-PGDM濃度はwild-typeマウスにおいて6.8±1.0ng/mg Cre(平均値±標準誤差)であったが、mdxマウスでは17.8±0.8ng/mg Cre(平均値±標準誤差、p<0.0003)であり、約3倍の高値を示した。この結果は、尿中Tetranor-PGDM濃度が筋ジストロフィー症状発現に伴う尿中マーカーとなることを示している。
次に、mdxマウスの症状に対するHPGDS阻害剤の作用を評価した。溶媒投与群では前肢握力の有意な変化はなかったが、被験化合物1を反復経口投与することでmdxマウスの前肢握力は有意に増加した(図1右)。同じmdxマウスでの尿中Tetranor-PGDM濃度を測定した結果、被験化合物1投与群では尿中Tetranor-PGDM濃度が有意に低下した(図1左)。この結果はmdxマウスでの症状改善と尿中Tetranor-PGDM濃度の変動が相関することを示している。
正常犬に比べて、筋ジストロフィーモデル犬であるCXMDJでは尿中Tetranor-PGDM濃度は高値を示し、被験化合物2を投与したCXMDJでは尿中Tetranor-PGDM濃度が減少した(表1)。この結果は、尿中Tetranor-PGDM濃度が筋ジストロフィー症状発現に伴う尿中マーカーとなることを示している。
約1年間にわたり被験化合物2を経口投与した後に、溶媒投与に切り替えたCXMDJでは尿中Tetranor-PGDM濃度が増加し(図2左)、症状スコアが増悪していた。一方、約1年間にわたり溶媒を経口投与した後に、阻害剤投与に切り替えたCXMDJでは尿中Tetranor-PGDM濃度が低下し(図2右)、症状スコアが軽減していた。この結果は、尿中Tetranor-PGDM濃度の変動が筋ジストロフィー治療薬投与による効果判定マーカー、又は予測マーカーになりうることを示している。
Claims (8)
- 被験体から分離した検体中のTetranor-PGDM含量を測定する工程を含む、筋変性疾患の検出方法。
- 筋変性疾患の患者から分離した検体中のTetranor-PGDM含量を測定する工程を含む、筋変性疾患に対する治療薬及び/又は治療方法の効果判定方法。
- 前記検体が尿である、請求項1又は2に記載の方法。
- Tetranor-PGDMの測定が、高速液体クロマトグラフィー-タンデムマススペクトロメトリー法(HPLC-MS/MS)、酵素免疫測定法(EIA)、放射性免疫測定法(RIA)、蛍光免疫測定法(FIA)、エライザ法(ELISA)または酵素法により行われる、請求項1~3のいずれかに記載の方法。
- 筋変性疾患が進行性筋ジストロフィー症、先天性筋ジストロフィー症、肢帯型筋ジストロフィー症、顔面肩甲上腕型筋ジストロフィー症、筋強直性筋ジストロフィー症、筋萎縮性側索硬化症またはミオパチーである、請求項1又は2に記載の方法。
- Tetranor-PGDMに対する抗体を含むことを特徴とする筋変性疾患の診断測定用キット。
- Tetranor-PGDMに対する抗体を含むことを特徴とする筋変性疾患の治療薬及び/又は治療方法の効果予測及び/又は判定用キット。
- Tetranor-PGDMに対する抗体、標識されたTetranor-PGDM、必要に応じてさらに抗イムノグロブリン抗体、検体希釈液、抗体ないし標識Tetranor-PGDMの希釈液、既知濃度の標準Tetranor-PGDM、EIA用の基質、EIA用の停止液からなる群から選ばれる少なくとも1種を含む請求項6又は7に記載のキット。
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WO2011108534A1 (ja) * | 2010-03-01 | 2011-09-09 | Shinozawa Takao | プロスタグランディンD2とその代謝物およびクレアチニンの分析による筋萎縮性側索硬化症(ALS)の診断方法、治療における薬物の有効性を評価する方法および尿中のtPGDM濃度を推測するシステム |
JP5069804B2 (ja) * | 2010-03-01 | 2012-11-07 | 隆雄 篠澤 | 筋萎縮性側索硬化症(als)の患者の進行度を判定し進行のモニターを行う方法 |
WO2016021704A1 (ja) * | 2014-08-06 | 2016-02-11 | 国立大学法人東京大学 | 食物アレルギーの検査方法及び検査用キット |
WO2022177003A1 (ja) * | 2021-02-22 | 2022-08-25 | 国立大学法人東京大学 | 抗tetranor-PGDMモノクローナル抗体及びその用途 |
RU2755768C1 (ru) * | 2021-03-09 | 2021-09-21 | Федеральное государственное бюджетное учреждение "Национальный медицинский исследовательский центр глазных болезней имени Гельмгольца" Министерства здравоохранения Российской Федерации (ФГБУ "НМИЦ ГБ им. Гельмгольца" Минздрава России) | Способ прогнозирования развития FUS-ассоциированных нейродегенеративных нарушений у мышей |
WO2024135797A1 (ja) * | 2022-12-22 | 2024-06-27 | 武田薬品工業株式会社 | ジストロフィンの測定方法 |
RU2808833C1 (ru) * | 2023-03-02 | 2023-12-05 | Публичное акционерное общество "Центр Генетики и Репродуктивной Медицины "ГЕНЕТИКО" | Способ преимплантационного генетического тестирования лице-лопаточно-плечевой мышечной дистрофии |
Also Published As
Publication number | Publication date |
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KR20110134907A (ko) | 2011-12-15 |
US20110318764A1 (en) | 2011-12-29 |
AU2010222123B9 (en) | 2014-07-24 |
AU2010222123A1 (en) | 2011-09-15 |
CA2753881C (en) | 2020-03-10 |
CA2753881A1 (en) | 2010-09-16 |
EP2407784B1 (en) | 2021-05-05 |
EP2407784A1 (en) | 2012-01-18 |
CN102348982A (zh) | 2012-02-08 |
US8658390B2 (en) | 2014-02-25 |
RU2524641C2 (ru) | 2014-07-27 |
KR101395337B1 (ko) | 2014-05-13 |
EP2407784A4 (en) | 2012-09-05 |
ES2870851T3 (es) | 2021-10-27 |
AU2010222123B2 (en) | 2014-01-30 |
RU2011140807A (ru) | 2013-04-20 |
JP5713887B2 (ja) | 2015-05-07 |
JPWO2010104025A1 (ja) | 2012-09-13 |
CN102348982B (zh) | 2014-09-17 |
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