JP2014132864A - Neurodegenerative disease biomarker for multiple sclerosis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miRNA to be a biomarker which can be used in the inspection diagnosis and therapy of multiple sclerosis.SOLUTION: Measurement of a miRNA identified in the invention makes it possible to detect multiple sclerosis. The miRNA in the invention can be also used in the inspection diagnosis and therapy of the above disease, and further used in screening for compounds to be a therapeutic agent of the above disease.

Description

  The present invention relates to a microRNA (miRNA) useful as a diagnostic test for detecting the presence of a neurodegenerative disease and a therapeutic target for the disease.

  Since neurodegenerative diseases including dementia are generally progressive and involve irreversible degeneration of brain neurons, it is important to diagnose early and start treatment. However, an effective biomarker has not been established at present, a diagnostic method using a serological test method has not been established, and a reliable treatment method has not been established. As a result, it is refractory and the situation in which daily life is destroyed, not only the physical burden of the patient himself, but also a great burden on the family. Neurodegenerative diseases are not only for patients themselves but also for caregivers, and there is a real situation that leads to a great loss of vitality for the whole society. In Japan, where a super-aging society is advancing, countermeasures against neurodegenerative diseases have become an important national issue. That is, (1) It is a fundamental issue of medical welfare administration in an aging society, (2) To reduce huge economic loss due to dementia (equivalent to 5 trillion yen per year), (3) Japan through medical innovation Promote the development of innovative treatments from Japan, eliminate the import deficit in Japan (over 2 trillion yen), and (4) focus diseases (cancer, It is designated as intractable disease / rare disease, hepatitis, infection, diabetes, cerebrocardiovascular disease, neuropsychiatric disease, pediatric disease). Thus, the development of new biomarkers, the development of diagnostic reagents, and the development of therapeutic drugs and treatment methods are urgent issues.

  With regard to laboratory diagnostic methods, if disease-related biomarkers are identified and serological diagnostic methods enable simple early diagnosis and monitoring of pathological conditions, early treatment becomes possible, and many patients are irreversible. Damage can be minimized. If early diagnosis becomes possible, there is no doubt that it will greatly contribute to improving the QOL of not only patients but also caregivers, and thus maintaining the vitality of the entire Japanese society that has become super-aged. Regarding the treatment method, not only the pathologic-improving drug but also the progression inhibitor is sufficiently medically significant, and it is important to analyze the involvement of the biomarker in the nerve function.

  In vivo factors related to the onset and pathogenesis of neurodegenerative diseases have been extensively studied from genes to cells, but there are so many unexplained parts, and no useful biomarkers have yet been found to lead to diagnosis or treatment . Among refractory neurodegenerative diseases, multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system and is characterized by frequent lesions in time and space. The diagnosis is usually confirmed by proving the multiple occurrences of temporal and spatial lesions through detailed medical history and temporal neurological examination and denying other diseases. Although there are no initial symptoms specific to MS, visual impairment is relatively high, and about 20% of retrobulbar optic neuritis develops into multiple sclerosis. The main symptoms seen during the entire course of MS are vision impairment, double vision, cerebellar ataxia, limb paralysis (monoplegia, paraplegia, hemiplegia), sensory disturbance, bladder rectal disorder, gait disturbance, etc., brain lesions It depends on the part. In MRI images of the brain, lesions frequently occur around the ventricle. Especially, lesions around the fourth ventricle often show cerebellar symptoms or brain stem symptoms. Characterized by ataxia and intention tremor. Because the cause is unknown and the diagnosis depends largely on clinical symptoms, the development of biomarkers useful for early diagnosis has become an urgent issue.

  In recent years, microRNA (abbreviated as miRNA) has attracted attention as an important factor of in vivo factors. miRNA is a protein non-coding RNA of about 22 bases, and it has been suggested that there are about 1000 or more types in humans. miRNA attracts attention as a molecule that suppresses the expression of various genes in vivo. A region of each miRNA gene exists on the genome and is transcribed by RNA polymerase II to form a miRNA initial transcription product of about several hundred bases. The miRNA initial transcript is processed by two RNase III enzymes called Drosha in the nucleus and Dicer in the cytoplasm to form mature miRNA. It is known that a mature miRNA interacts with mRNAs of a plurality of target genes having complementary sequences while cooperating with a regulatory protein complex (RNA-induced silencing complex: RISC) to suppress gene expression.

Although miRNA has been suggested to be widely related to human diseases, the expression of many miRNAs differs between normal and cancerous tissues in various organs, particularly regarding the relationship between cancer and miRNA. The involvement of abnormal expression is strongly suggested. That is, it has been strongly suggested that a decrease in tumor suppressor miRNA expression or an increase in carcinogenic miRNA expression may be involved in the human carcinogenesis process (Non-patent Document 1). Regarding the industrial use of miRNA, it is mainly used in the field of cancer, but finally its use for drug discovery for various diseases has begun to be reported (Non-patent Document 2).
It has also been reported in cancer (Non-patent Document 3) and heart disease (Non-patent Document 4) that miRNAs present in blood can be used for disease diagnosis as a disease-related biomarker.
In the field of neurological diseases, it has been reported that miRNA present in the cerebrospinal fluid (CSF) of the central nervous system has a diagnostic significance rather than blood, for example, multiple sclerosis: MS) reports miR-922, miR-181c, miR-633, and the like as candidates (Non-Patent Document 5). On the other hand, a method of using miRNA for regeneration of nerves after injury (Patent Document 1) and a method of stimulating neuronal differentiation of pluripotent stromal cells (Patent Document 2) have been reported.

There are various pathologies of neurodegenerative diseases such as neuronal atrophy / deletion, tissue destruction, demyelination, and regeneration, and it is particularly assumed that many miRNAs are involved. In the common phenomenon of neuronal degeneration, the involvement of miRNA common to various neurodegenerative diseases is assumed, but in MS, there is also an aspect of autoimmune disease, and the involvement of miRNA of the immune system is also assumed.
As a test sample, plasma is more convenient than CSF because it has a low patient burden at the time of collection and is convenient. In addition, since clinical tests play an auxiliary role in the final diagnosis, it is considered highly practical to detect biomarkers that are highly common to neurodegenerative diseases by blood tests. However, even in this case, as long as it is a neurodegenerative disease, it is desirable that blood and CSF be consistent.
However, the search of miRNA from the viewpoint of a neurodegenerative disease related biomarker suitable for primary screening in blood tests is rarely performed. Development of a disease biomarker useful for diagnostic diagnosis or drug discovery using miRNA, which can be used in blood tests and can quickly detect signs of neurodegeneration, especially for early diagnosis of progressive disease. Is anxious.

Special table 2011-515407 Special table 2012-530054 gazette

MicroRNA regulation and cancer, experimental medicine vol.27, No.8, 2009. MicroRNA, gene medicine MOOK 23 2012 Allegra A et al., Int J Oncol. 2012; 41 (6): 1897-912. Fichtlscherer S. et al., Arterioscler Thromb Vasc Biol. 2011; 31 (11): 2383-90. Haghikia A. et al., Neurology. 2012; 79 (22): 2166-2170.

As described above, no examination method or treatment method for MS has been established, which is a major medical problem. If miRNA that can be used as a biomarker for neurodegenerative diseases of miRNA that is said to be involved in diseases is found and its usage is established, it will be possible to apply it to new diagnostic methods, pathological monitoring methods, and therapeutic drugs. .
The object of the present invention is the use of miRNA for the examination and treatment of neurodegenerative diseases. In particular, miRNA that is a common or individual biomarker for neurodegenerative diseases including MS is clinically examined, monitored for pathological conditions, and further treated. It is to apply to.

The present invention relates to the following inventions:
[1] A method for detecting a neurodegenerative disease, comprising a step of measuring miRNA in a sample collected from a subject, wherein the miRNA is at least one of the miRNAs described in Table 1.
[2] The detection method of [1], wherein the neurodegenerative disease is multiple sclerosis.
[3] The treatment comprising the steps of collecting a sample from a subject treated for a neurodegenerative disease and measuring the miRNA in the sample, wherein the miRNA is at least one of the miRNAs listed in Table 1. How to determine the effect.
[4] A pharmaceutical composition comprising at least one full length or a part of the miRNA listed in Table 1 as an active ingredient.
[5] A pharmaceutical composition comprising as an active ingredient an oligonucleotide that suppresses at least one of the miRNAs described in Table 1.
[6] A method for screening a therapeutic agent for a neurodegenerative disease using as an index the expression of at least one of the miRNAs listed in Table 1.
[7] A method for screening for a therapeutic agent for a neurodegenerative disease using the gene product of at least one target gene of miRNA described in Table 1 as an index.

  According to the detection method of the present invention, neurodegenerative diseases, particularly MS, can be detected by a simple genetic test method. Moreover, miRNA in this invention can be utilized for the test | inspection diagnosis and treatment of the disease. Furthermore, it can utilize for the screening of the compound used as the therapeutic agent of the disease.

FIG. 1 shows the variation of CSF-derived miRNA in the order of increase and decrease in the CSF-derived miRNA group in the X-axis direction in relation to miRNA groups (199 types) that varied in plasma and CSF of MS patients. It is the graph which plotted the fluctuation rate (□ mark) of plasma origin miRNA.

Except as specifically described below, the detection method, therapeutic effect determination method, therapeutic method, pharmaceutical composition, and therapeutic drug screening method of the present invention can be referred to each other as appropriate.
In the detection method of the present invention, miRNAs listed in Table 1 can be used as a common or individual biomarker for detecting neurodegenerative diseases, particularly MS. In Table 1, the fluctuation of miRNA was expressed as “increase” when increased in each disease as compared to healthy controls, and “decrease” when decreased in each disease. In addition, as in the examples described later, miRNAs commonly detected in a plurality of neurodegenerative diseases are indicated by adding a circle to “common”, but these are preferably used for primary screening of neurodegenerative diseases. it can. It is preferable that a plurality of diseases have higher commonality, and that at least two diseases, preferably three diseases, and more preferably four diseases are common.
The miRNA can be used alone or in a plurality of uses. In order to increase the accuracy, it is preferable to use a combination of a plurality, and specifically, it is desirable to use miRNA in a combination of 1 to 20, preferably 3 to 10. Moreover, it can also utilize combining a well-known miRNA.

As specific experimental data show in the examples described below, in plasma and CSF, miRNAs in Table 1 fluctuated in CSF and plasma in MS patients compared to healthy individuals. Therefore, even in samples such as lymph, saliva, tears, nasal discharge, urine, etc., which are body fluids collected from subjects, particularly patients with suspected neurodegenerative diseases or patients with neurodegenerative diseases, these miRNAs (hereinafter referred to as detection miRNAs). It is possible to determine whether or not it is a neurodegenerative disease or MS.
In addition, all or part of the reduced miRNA is administered as a pharmaceutical composition and supplemented with miRNA, or an oligonucleotide nucleic acid drug that acts to reduce the increased miRNA is administered to reduce the effect of excess miRNA. Inhibition can provide a drug useful for the treatment of neurodegenerative diseases including MS.

  In the case of miRNAs whose presence is increasing, the fluctuation rate (Fold change) tends to be high. Therefore, miRNA having a fluctuation rate (Log 2 notation) of +0.1 or more, preferably +0.5 or more can be used as a neurodegenerative disease biomarker. On the other hand, in the case of miRNA whose presence has decreased, its fluctuation rate (Fold change) tends to be low. Therefore, miRNA having a variation rate (Log 2 notation) of −0.1 or less, preferably −0.5 or less can be used as a neurodegenerative disease biomarker. However, since the rate of change may vary depending on the measurement conditions, miRNAs that serve as biomarkers can be selected in descending order of the range of change regardless of the reference value of the rate of change. The miRNA sequences in Table 1 can be obtained from a known database (miRBase: http://www.mirbase.org/).

When miRNA or mRNA of its target gene is used as a biomarker in the detection method of the present invention, measurement is performed by a known genetic test method such as a hybridization method using a nucleic acid probe or a PCR method using a PCR primer. be able to.
When the polypeptide encoded by the target gene of miRNA is used as a biomarker in the detection method of the present invention, a protein analysis method known per se, for example, an immunological analysis method using an antibody, biochemistry such as electrophoresis, etc. An automatic analyzer for clinical examination can also be used.

  Samples used in the method of the present invention include, for example, brain disease sites, cerebrospinal fluid, blood samples (eg, peripheral blood, plasma, serum), saliva, tears, nasal discharge, urine, lymph, and other body fluids, preferably A brain disease site or a peripheral site (eg, cerebrospinal fluid) can be used. Furthermore, organ tissues, pathological tissues, cells collected by biopsy, or components extracted therefrom can also be used.

The miRNAs listed in Table 1 used as biomarkers in the detection method of the present invention can also be used to determine the effects of various treatments performed on neurodegenerative diseases, particularly MS patients.
The therapeutic effect determination method of the present invention includes a step of collecting a sample from a subject treated for a neurodegenerative disease, and a step of measuring miRNA in the sample.

  In the therapeutic effect determination method of the present invention, when determining the therapeutic effect on MS patients, the miRNA for MS detection shown in Table 1 can be used.

  When the miRNA for MS detection shown in Table 1 (miRNA whose abundance is increased in MS patients) is used as a biomarker, the miRNA value before the treatment is higher than that of healthy subjects. There is a tendency to show. When the miRNA value decreases by treatment, it can be determined that the treatment was effective. On the other hand, if the treatment did not decrease, it can be determined that the treatment was ineffective. In addition, when the miRNA for MS detection shown in Table 1 (miRNA whose abundance is reduced in MS patients) is used as a biomarker, the miRNA value is lower in healthy MS patients before the treatment. There is a tendency to show numerical values. When the miRNA value increases as a result of treatment, it can be determined that the treatment was effective. On the other hand, when the treatment does not increase, it can be determined that the treatment has no effect. However, since it is estimated that miRNAs individually control the expression of target genes in multiple types, the individual miRNA values do not have to fluctuate in a coordinated manner, and have a therapeutic effect in consideration of the state of clinical symptoms. Determined.

  In the treatment method of the present invention, the full-length or a part of miRNA whose presence is decreased in neurodegenerative diseases, particularly MS, and whose fluctuation is indicated as “decreased” in Table 1, is supplemented in blood or CSF. By doing so, a neurodegenerative disease can be treated. On the other hand, neurodegenerative diseases can be treated by suppressing the increased miRNA in the patient's body with respect to the full length or part of the miRNA whose variation is indicated as “increased” in Table 1. . As a method for suppressing miRNA in a living body, it can be carried out according to a method known per se, for example, an oligonucleotide (antisense oligonucleotide) comprising a complementary sequence capable of hybridizing with the full length or a part of the target miRNA. Can be administered.

The above-mentioned method for administering miRNA or inhibitory oligonucleotide to a patient can be performed according to a method known per se, a method of encapsulating miRNA or a derivative thereof in a liposome imitating exosome, a complex with collagen A method of slow release as a body, utilization of a chemically modified product by 4'-thioRNA conversion in which O (oxygen) in the sugar portion of RNA is replaced with S (sulfur), 2'-F as the sugar portion of the oligonucleotide, It can be replenished stably in vivo by using a chemically modified product modified with 2′-O-methyl or 2′-O-methoxyethyl. At the same time, since miRNA has a high possibility of controlling a target gene with a plurality of molecules, replenishment with a plurality of nucleic acid cocktails can be preferably used for the above-described nucleic acid supplementation method. These are the pharmaceutical compositions in the present invention.
In this specification, the term “treatment” includes “treatment” in a narrow sense for treating a patient after the onset of a disease and “prevention” for treating a patient before the onset of the disease.

The miRNA described in Table 1 used as a biomarker in the detection method of the present invention can be used for screening therapeutic agents for neurodegenerative diseases, particularly neurodegenerative diseases including MS.
In the present invention, a method for screening a candidate substance (for example, a compound) that targets a gene product of miRNA or a target gene thereof is a method or culture in which a candidate substance that directly binds to a target is examined by spectroscopic changes in vitro. A method of examining a target substance (miRNA or gene product of the target gene) in a cultured cell by exposing a candidate substance to cells is applied, and in vivo, a neurodegenerative symptom or a neurodegenerative pathological image in a model animal The method using the improvement of the index as an index is applied.
In the screening method of the present invention, in the embodiment using miRNA expression shown in Table 1 as an index, for example, a candidate substance is administered to cultured cells, tissues, or animal individuals (particularly, non-human animals). , By collecting a sample from the individual, and measuring the miRNA in the sample.
Candidate substances to be evaluated by the screening method of the present invention are not particularly limited, but in addition to various compounds, various extracts such as culture supernatants of microorganisms, natural organisms or extracts derived from various organisms or tissues thereof Can be mentioned. Furthermore, the cells used are cultured cells isolated from tissues, established cell lines, ES cells, iPS cells, Muse cells, etc. In non-human animals, specific genes were knocked out or knocked in. Model mice and model rats can be mentioned.

  In the screening method of the present invention, when measuring at least one miRNA whose variation is expressed as “decreased” in Table 1, a substance capable of increasing the amount of the miRNA is used as a candidate for a therapeutic agent for neurodegenerative diseases. You can choose. On the other hand, when measuring at least one miRNA whose variation is indicated as “increase” in Table 1, a substance capable of reducing the amount of the miRNA can be selected as a candidate for a therapeutic agent for neurodegenerative diseases. .

  EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but these do not limit the scope of the present invention.

Example 1: Analysis of miRNA in plasma and cerebrospinal fluid of a patient with multiple sclerosis (MS)
The subjects were 6 confirmed MS patients (3M + 3F, 32.7 ± 4.03 years) and 6 healthy controls (plasma collector: 3M + 3F, 41.0 ± 12.6 years, CSF collector: 3M + 3F, 60.6). At ± 1.8), peripheral blood and cerebrospinal fluid (CSF) were collected with the consent of the individual. M is the number of male cases and F is the number of female cases.
For blood collection, 20 mL of peripheral blood was collected from the brachial vein of the subject, immediately centrifuged at 4 ° C. and 3000 rpm for 10 minutes, and 0.6 mL of the supernatant was dispensed into polypropylene tubes and stored frozen at −80 ° C. .

  About 3 mL of CSF was collected by performing lumbar puncture on the subject. After collection, it was immediately centrifuged at 4 ° C. and 3000 rpm for 10 minutes, and 0.6 mL of the supernatant (plasma) was dispensed into a polypropylene tube and stored frozen at −80 ° C. From each of the three cryopreserved groups, RNA was extracted, and miRNA analysis was performed using a microarray.

The microarray uses a 3D-gene chip (manufactured by Toray Industries, Inc.) and is equipped with a miRNA extract specified by the manufacturer, a hybridization reagent set, and a human miRNA Oligo chip (about 1800 human miRNA probes selected from the database miRBase Release 17.0). ), And the signal value of miRNA bound to the probe was normalized (global normalization). The change in the signal intensity of the patient group with respect to the healthy control group was determined as a change rate (Fold change), and the change rate was expressed in Log 2 notation.
The fluctuation rate expressed by Log 2 was defined as “more than 0.1” as “increased miRNA (upregulated miRNA)” and “−0.1 or less” as “downregulated miRNA”.

  The miRNA obtained from the CSF is considered to reflect the pathological information of the central nervous system, while the miRNA in plasma is considered to reflect the miRNA in the general state. As for the general condition, not only the central nervous system, but also the effects of the circulatory system and immune system are considered to be large. The extent to which the consistency of the central nervous system is determined by the selection of miRNA as a neurodegenerative disease-related biomarker An important key.

To examine this, the profile of miRNA obtained from CSF and plasma was examined. As shown in FIG. 1, when miRNA fluctuation in CSF is plotted as an axis, the miRNA profile in plasma does not necessarily match the miRNA profile in CSF as a whole, and some miRNAs have fluctuations in CSF and plasma. Then you can read. Therefore, from each figure, miRNAs for which consistency of fluctuation was obtained were extracted and summarized in Table 1.
Table 1 shows the miRNA name, signal value in plasma (Plasma) and cerebrospinal fluid (CSF), rate of change (FC = Fold change), degree of change (“increase” increases, “decrease” decreases) A molecule that is commonly detected in a plurality of diseases including MSA, ALS, and AD, which will be described later, and that is suitable for a general test for a neurodegenerative disease is indicated by “common”. “Common” miRNAs are also detected in other neurodegenerative diseases, as shown in Example 2. MiRNAs other than “common” can be used as biomarkers for individual detection of MS.
Furthermore, these miRNA groups can be used as test diagnostic biomarkers or miRNA information for treatment of each disease.

  In addition, since the miRNA described in the present specification uses a commercially available 3D-gene chip (manufactured by Toray Industries, Inc.) equipped with about 1800 human miRNA probes selected from the database miRBase Release 17.0, as described above, The name (ID) based on the database miRBase Release 17.0 is used. Table 2 shows the names of the miRNAs described in this specification and the Accession No. in the database miRBase (http://www.mirbase.org/).

<< Example 2: Analysis of miRNA in plasma and cerebrospinal fluid of patients with other neurodegenerative diseases >>
Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system and is characterized by frequent lesions in time and space. The cause of MS is not yet clear, but the lesions are infiltrated with lymphocytes and macrophages, and inflammation via the autoimmune mechanism ultimately causes an autoimmune state against central nervous system myelin constituent proteins and demyelination. Is thought to occur. Therefore, although MS is a neurodegenerative disease, it is also an autoimmune disease and is considered to exhibit a pathology different from other neurodegenerative diseases.
Compared to other neurodegenerative diseases, multiple system atrophy (MSA) is accompanied by cerebellar degeneration and atrophy, and amyotrophic lateral sclerosis (ALS) is a motor neuron. The pathological difference is that Alzheimer's Disease (AD) is accompanied by amyloid β deposition and brain atrophy. Therefore, in MS where inflammation and immunity are greatly involved, disease biomarker miRNA is likely to be different from MSA, ALS, AD, etc. The parts related to modeling may be common.
For the above reasons, in order to extract miRNA common to neurodegeneration, CSF and plasma miRNA of MSA, ALS, and AD patients were examined.

  Peripheral blood and cerebrospinal fluid (CSF) were collected from the MSA patients with a definite diagnosis, ALS patients with a definitive diagnosis, AD patients with a definitive diagnosis, and healthy subjects with the consent of the individual. Table 3 shows the breakdown of subjects who participated in this study. The miRNA extraction / analysis method is the same as in Example 1.

As a result, as shown in Table 4, although the change in increase / decrease due to the difference in the disease was observed in part, the miRNA that changed in MSA, ALS, and AD patients changed in MS patients. However, they were similarly detected and shown to be miRNAs common to neurodegenerative diseases.
Table 5 summarizes the commonality of each disease for each miRNA. hsa-miR-1280 showed a common variation in all four diseases. The numerical values of plasma and CSF in the table indicate signal values (expression intensity) at the time of microarray measurement.

  Our current thinking is that, in some cases, there is a difference between the common miRNAs of MSA, ALS, AD, and MS diseases ("increased" in the common miRNAs in Tables 1 and 4). Variations in which “decrease” is reversed may occur, but this is due to the pathological mechanism of the disease. That is, MSA, ALS, and AD are pathological images mainly of neuronal degeneration, while MS is a pathological image mainly of demyelination of nerve fibers and is characterized by strong inflammation and immune response. As a result, it is considered that the behavior of miRNA in MSA, ALS, and AD is affected by the pathological mechanism in MS and the behavior of miRNA is different. However, miRNAs shown in Table 1 in the present invention are common miRNAs that are involved in neural tissue related to MS and have sharp features in neuropathology, and are highly useful as neurodegenerative disease-related biomarkers. I can say that.

  The present invention can be used for examination diagnosis and treatment of multiple sclerosis. Furthermore, it can utilize for the screening of the compound used as the therapeutic agent of the disease.

Claims (7)

  A method for detecting a neurodegenerative disease, comprising a step of measuring miRNA in a sample collected from a subject, wherein the miRNA is at least one of the miRNAs listed in Table 1.   The detection method according to claim 1, wherein the neurodegenerative disease is multiple sclerosis.   Determination of the therapeutic effect, comprising the steps of collecting a sample from a subject treated for neurodegenerative disease and measuring the miRNA in the sample, wherein the miRNA is at least one of the miRNAs listed in Table 1. Method.   A pharmaceutical composition comprising, as an active ingredient, at least one full length or a part of miRNA listed in Table 1.   A pharmaceutical composition comprising as an active ingredient an oligonucleotide that suppresses at least one of the miRNAs listed in Table 1.   A method for screening a therapeutic agent for a neurodegenerative disease, using as an index the expression of at least one of the miRNAs listed in Table 1.   A method for screening a therapeutic agent for a neurodegenerative disease, wherein the gene product of at least one target gene of miRNA described in Table 1 is used as an index.

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