The present invention relates to methods for determining Parkinson's disease in human patients.
Parkinson's Disease (PD) is a highly specific degeneration of dopamine-containing cells of the substantia nigra of the midbrain, causing a dopamine deficiency in the striatum. PD currently affects about 10 million people worldwide. Effective management of a patient with PD is possible in the first 5-7 years of treatment, after which time a series of often debilitating complications, together referred to as Late Motor Fluctuations (LMF), occur. It is believed that treatment with levodopa ((-)-L-α-amino-beta-(3,4-dihydroxybenzene) propanoic acid), or L-dopa, the most effective anti-Parkinson drug, may facilitate or even promote the appearance of LMF. Dopamine agonists are employed as a treatment alternative, but they do not offer the same degree of symptomatic relief to patients as L-dopa does.
Symptomatic therapies improve signs and symptoms without affecting the underlying disease state. Levodopa increases dopamine concentration in the striatum, especially when its peripheral metabolism is inhibited by a peripheral decarboxylase inhibitor (PDI). Levodopa/PDI therapy is widely used for symptomatic therapy for Parkinson's disease, such as combinations with levodopa, with carbidopa ((-)-L-α-hydrazino-α-methyl-beta-(3,4-dihydroxybenzene) propanoic acid monohydrate), levodopa and controlled release carbidopa, levodopa and benserazide, levodopa plus controlled release benserazide (2-Amino-3-hydroxy-propionic acid N'-(2,3,4-trihydroxy-benzyl)-hydrazide).
Catechol-O-methyltransferase (COMT) inhibitors enhance levodopa treatment as they inhibit levodopa's metabolism, enhancing its bioavailability and thereby making more of the drug available in the synaptic cleft for a longer period of time. Examples of COMT inhibitors include tolcapone (3,4-dihydroxy-4'-methyl-5-nitrobenzophenone) and entacapone ((E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl-2-propenamide).
Dopamine agonists provide symptomatic benefit by directly stimulating post-synaptic striatal dopamine receptors. Examples include bromocriptine ((5α)-2-Bromo-12'-hydroxy-2'-(1-methylethyl)-5'-(2-methylpropyl)erg- otaman-3',6',18-trione), pergolide (8B-[(Methylthio)methyl]-6-propylergoline), ropinirole (4-[2-(Dipropylamino)ethyl]-1,3-dihydro-2H-indol-2-one), pramipexole ((S)-4,5,6,7-Tetrahydro-N6-propyl-2,6-benzothiazolediamine), lisuride (N'-[(8α)-9,10-didehydro-6-methylergolin-8-yl]-N,N-diethyl- urea), cabergoline ((8β)-N-[3-(Dimethylamino)propyl]-N-[(ethylamino)carbonyl]-6-(2-propenyl)ergoline-8-carboxamide), apomorphine ((6aR)-5,6,6a,7-Tetrahydro-6-methyl-4 H-dibenzo[de,g]quinoline-10,11-diol), sumanirole (5-(methylamino)-5,6-dihydro-4H-imidazo {4,5,1-ij}quinolin-2(1H)-one), rotigotine ((-)(S)-5,6,7,8-tetrahydro-6-[propyl[2-(2-thienyl)ethyl]amino]-1-naphthol-), talipexole (5,6,7,8-Tetrahydro-6-(2-propenyl)-4H-thiazolo[4,5-d]azepin-2-amine), and dihydroergocriptine (ergotaman-3 ',6', 18-trione,9,10-dihydro-12'-hydroxy-2'-methyl-5'-(phenylmethyl) (5' cc)). Dopamine agonists are effective as monotherapy early in the course of Parkinson's disease and as an adjunct to levodopa in more advanced stages. Unlike levodopa, dopamine agonists directly stimulate post-synaptic dopamine receptors. They do not undergo oxidative metabolism and are not thought to accelerate the disease process.
Amantidine (1-Aminotricyclo (3,3,1,13,7) decane) is an antiviral agent that was discovered by chance to have anti-Parkinsonian activity. Its mechanism of action in PD has not been established, but is believed to work by increasing dopamine release. Patients who receive amantidine either as monotherapy or in combination with levodopa show improvement in akinesia, rigidity and tremor.
Other medications used in the treatment of Parkinson's disease include MAO-B inhibitors. Inhibition of L-dopa metabolism through inactivation of the monoamino oxidase type B (MAO-B) is an effective means of enhancing the efficacy of both endogenous residual dopamine and that exogenously derived from its precursor, L-dopa. Selegiline (methyl-(1-methyl-2-phenyl-ethyl)-prop-2-ynyl-amine) is a MAO-B inhibitor. There is evidence that treatment with selegiline may slow down disease progression in PD by blocking formation of free radicals derived from the oxidative metabolism of dopamine. Other examples of MAO B inhibitors include lazabemide (N-(2-Aminoethyl)-5-chloro-2-pyridinecarboxamide), rasagiline (N-propargyl-1-(R)aminoindan and caroxazone (2-oxo-2H-1,3-benzoxazine-3(4H)-acetamide).
It is imperative to diagnose individuals with PD at an early stage to increase the efficacy of therapeutic agents. However, there are neither any objective tests nor established biomarkers for diagnosing PD. Moreover, the heterogeneity, subtypes and progression of the disease make it difficult to develop specific therapeutic candidates.
MicroRNAs ("miRNAs) are a class of non-coding RNAs that play key roles in the regulation of gene expression. miRNAs act at the post-transcriptional level and fine-tune the expression of as much as 30% of all mammalian protein-encoding genes. Mature miRNAs are short, single-stranded RNA molecules approximately 22 nucleotides in length. miRNAs may be encoded by multiple loci, and may be organized in tandemly co-transcribed clusters. miRNA genes are transcribed by RNA polymerase II as large primary transcripts (pri-microRNA) that are processed by a protein complex containing the RNase III enzyme Drosha, DGCR8 and other cofactors, to form an approximately 70 nucleotide precursor microRNA (pre-miRNA). (
The presence of miRNAs has been reported in body fluids including blood, cerebrospinal fluid (CSF), plasma, serum and saliva at detectable levels. The tissue-specificity of miRNAs suggests their vital and integral role in various physiological processes. The tissue-enrichment promises a new but less explored role as diagnostic biomarker and potential therapeutic target. Circulating miRNAs are understood to originate from passive leakage from damaged tissue as a result of cell lysis or apoptosis, active transport from cells via microvesicles, such as exosomes, or bound within RISC protein complexes (Etheridge et al, 2011). Exosome and osmotic pump-mediated delivery of small RNA molecules to the brain and CNS, respectively, provides a solution to overcoming the limitations of miRNA-based therapies (Alvarez-Erviti et al., 2011;
It is an object of the present invention to identify miRNAs relevant to patients suffering from Parkinson's disease.
It is another object of the present invention to provide methods for determining patients suffering from Parkinson's disease.
These objects and others are achieved by the present invention, which provides miRNA biomarkers that may be used in pairs or in combination to determine patients suffering from Parkinson's disease. The scope of the invention is defined by the appended claims.
Figure 1 shows the mean fold change of three PARKmiRNAs between PD patients and healthy controls;Figure 2A is a ROC analysis based on predicted probabilities from the model and compared to true disease status;Figure 2B is a ROC analysis based on predicted prohibition from the model;Figure 3 is a ROC analysis based on predicted probabilities from the model and compared to true disease status;Figure 4 is a ROC analysis based on predicted probabilities from the model and compared to true disease status;Figure 5 is a ROC analysis based on predicted probabilities from the model and compared to true disease status;Figure 6(A)-(H) illustrate microRNAs targeting Parkinson's Disease proteins;Figure 7 is a ROC analysis based on predicted probabilities from the model and compared to true disease status;Figure 8 is a ROC analysis based on predicted probabilities from the model and compared to true disease status;Figure 9 is a ROC analysis based on predicted probabilities from the model and- compared to true disease status; and
Figure 10 is a ROC analysis based on predicted probabilities from the model and compared to true disease status.
All patients and controls participated in the Norwegian ParkWest project or the Swedish NYPUM study, which are ongoing prospective population-based longitudinal cohort studies investigating the incidence, neurobiology and prognosis of PD. The Norwegian ParkWest study is a prospective longitudinal multicenter cohort study of patients with incident Parkinson's disease (PD) from Western and Southern Norway. Between November 1st 2004 and 31 st of August 2006 it was endeavored to recruit all new cases of Parkinson Disease within the study area. Since the start of the study 212 of 265 (80 %) of these patients and their age-/sex-matched control group have been followed. Further information about this project can be found at http://www.parkvest.no. The NYPUM study began in 2004 and endeavours to identify all new cases with idiopathic parkinsonism within the Umeå catchment area and follow them in their disease progression for at least five years. Further information about this study can be found at http://www.ufbi.umu.se/english/collaborations/current-projects/nypum/.
All possible efforts were undertaken to establish an unselected and population-representative cohort of patients with PD. Patients were included if they had provided serum at study entry and fulfilled diagnostic criteria for PD of the National Institute of Neurological Disorders and Stroke (http://www.ninds.nih.gov/disorders/parkinsons_disease/parkinsons_disease.ht m) and UK Brain Bank (http://www.ncbi.nlm.nih.gov/projects/gap/cgi-bin/GetPdf.cgi?id=phd000042) at latest follow-up. Patients with secondary parkinsonism at study entry were excluded from this study. Control subjects were recruited from multiple sources, including friends, spouses, and public organizations for elderly and were included in this study if they had provided serum. All patients and controls were Caucasian.
In this study of possible biomarkers for PD we applied a two-stage procedure. For the first discovery phase serum from 16 patients and 8 controls were selected at random. The remaining 164 patients with PD and 182 controls that were eligible for this study were selected for verification purposes.
Serum samples were collected at the same day as the clinical examinations and then stored frozen at -70 degrees Celsius until transported to the facilities in New York on dry ice.
After thawing on ice, twenty-four (eight control, sixteen PD samples) serum samples were spun down for 5 mins at 3000xg to remove debris. The supernatant was used to perform small RNA isolation using miRCURY RNA Isolation Kit - Biofluids (Exiqon, MA). Before RNA Isolation, the lysis buffer was spiked with 0.267fmol/ul of spike-in control cel-miR-39-3p (Qiagen, CA). The remaining part of the RNA isolation was performed following manufacturer's protocol and the isolated RNA was quantified on a Nanodrop 2000 (Thermo Scientific, MA). The RNA was used for running Affymetrix v4 microRNA microarray chips and for subsequent cDNA synthesis and qPCR. RNA from 434 serum samples (22 control and 42 PD from NYPUM study in addition to 190 control and 180 PD from ParkWest project) was isolated as described above, they were not quantified by Nanodrop, but the qPCR data resulting from these samples were normalized by a reference small RNA scaRNA17.
The isolated RNA from twenty-four patient serum samples were quantified and subjected to Affymetrix GeneChip® miRNA 4.0 Array by the Yale Center for Genome Analysis (http://medicine.yale.edu/keck/ycga/index.aspx). The normalized .CEL files obtained from Affymetrix Expression Console software were imported into Partek Genomics Suite version 6.6 Copyright © 2012 (Partek, MO) for analysis. The 'microRNA Expression Workflow' was employed to detect differentially expressed miRNAs employing ANOVA resulting in lists of miRNAs significantly (p<0.05) expressed between control versus PD cohorts. The miRNAs detected were used for further qPCR verification.
cDNA for miRNA specific qPCR was synthesized using qScript™ microRNA cDNA Synthesis kit (Quanta Biosciences, MD) following manufacturer's protocol and subsequent qPCRs were performed using miRNA specific forward primers (Table#) and PerfeCTa®Universal PCR primer (Quanta Biosciences, MD). scaRNA17 and U6 were used reference small RNAs for normalizing qPCR Cq values whereas cel-miR-39-3p was used as spike-in control. PerfeCTa® SYBR® GREEN SuperMix for IQ™ (Quanta Biosciences, MD) was used for all qPCRs in a MyiQ™ Single color Real-Time PCR Detection System (Bio-Rad, CA). Standard curve for cel-miR-39-3p was analyzed in MS Excel with R2 = 0.97882 and PCR efficiency 92.96%. No Template Control (NTC) was implied wherever needed.
The discriminative ability of miRNAs with regard to PD diagnosis was assessed from ROC analysis using IBM SPSS Statistics, version 21; for combinations of miRNAs the test variable was the predicted probability from logistic regression with PD diagnosis (yes/no) as outcome. To minimize the influence of outlying values on the fit, logistic regression was performed with log transformed miRNA values.
Differentially expressed human miRNAs in Parkinson's disease patients' serum samples from The Norwegian ParkWest study were determined employing miRNA microarray. Provided below are the miRNAs with >1.2 fold differential expression.
hsa-miR-548ac, hsa-miR-335-5p, hsa-miR-548x-3p, hsa-miR-520g, hsa-miR-520h, hsa-miR-548ae, hsa-miR-3910-1, hsa-miR-4708-3p, hsa-miR-16-2-3p, hsa-miR-603, hsa-miR-3613-3p, hsa-miR-4797-5p, hsa-miR-548aj-3p, hsa-miR-450b-5p, hsa-miR-548ap-3p, hsa-miR-1184, hsa-miR-2277-5p, hsa-miR-1323, hsa-miR-548aa, hsa-miR-548t-3p, hsa-miR-221-5p, hsa-miR-190a-3p, hsa-miR-6873-5p, hsa-miR-155-3p, hsa-miR-510-5p, hsa-miR-4313, hsa-miR-3616, hsa-miR-8075, hsa-miR-4306, hsa-miR-6776, hsa-miR-6075, hsa-miR-8052, hsa-miR-532, hsa-miR-4791, hsa-miR-320b-1, hsa-miR-548y, hsa-miR-7973, hsa-miR-3136-5p, hsa-miR-606, hsa-miR-500a-3p, hsa-miR-4788, hsa-miR-4769-3p, hsa-miR-299-5p, hsa-miR-4431, hsa-miR-6749-5p, hsa-miR-138-2-3p, hsa-miR-1289-2, hsa-miR-548au, hsa-miR-6850, hsa-miR-561, hsa-miR-34b-5p, hsa-miR-3934-5p, hsa-miR-6739-5p, hsa-miR-4325, hsa-miR-4672, hsa-miR-215-5p, hsa-miR-4685-5p, hsa-miR-3160-1, hsa-miR-3160-2, hsa-miR-6793-5p, hsa-miR-8089, hsa-miR-6081, hsa-miR-892b, hsa-miR-936, hsa-miR-548ag, hsa-miR-345, hsa-miR-548k, hsa-miR-3188, hsa-miR-181b-5p, hsa-let-7e, hsa-miR-4487, hsa-miR-509-3p, hsa-miR-3689a-3p, hsa-miR-4771, hsa-miR-520a-5p, hsa-miR-3150b, hsa-miR-6782-5p, hsa-miR-937-5p, hsa-miR-455-3p, hsa-miR-6865-3p, hsa-miR-4749-5p, hsa-miR-378b, hsa-miR-7706, hsa-miR-4445 and hsa-miR-2355-5p.
hsa-miR-548ac, hsa-miR-335-5p, hsa-miR-548x-3p, hsa-miR-548ae, hsa-miR-4708-3p, hsa-miR-16-2-3p, hsa-miR-603, hsa-miR-3613-3p, hsa-miR-4797-5p, hsa-miR-548aj-3p, hsa-miR-450b-5p, hsa-miR-548ap-3p, hsa-miR-1184, hsa-miR-2277-5p, hsa-miR-1323, hsa-miR-548aa, hsa-miR-548t-3p, hsa-miR-221-5p, hsa-miR-190a-3p, hsa-miR-6873-5p, hsa-miR-155-3p, hsa-miR-510-5p, hsa-miR-4313, hsa-miR-4306, hsa-miR-8052, hsa-miR-4791, hsa-miR-7973, hsa-miR-3136-5p, hsa-miR-606, hsa-miR-500a-3p, hsa-miR-4769-3p, hsa-miR-299-5p, hsa-miR-6749-5p, hsa-miR-138-2-3p, hsa-miR-34b-5p, hsa-miR-3934-5p, hsa-miR-6739-5p, hsa-miR-4325, hsa-miR-215-5p, hsa-miR-4685-5p, hsa-miR-6793-5p, hsa-miR-936, hsa-miR-548ag, hsa-miR-548k, hsa-miR-181b-5p, hsa-let-7e, hsa-miR-509-3p, hsa-miR-3689a-3p, hsa-miR-4771, hsa-miR-520a-5p, hsa-miR-6782-5p, hsa-miR-937-5p, hsa-miR-455-3p, hsa-miR-6865-3p, hsa-miR-4749-5p, hsa-miR-378b and hsa-miR-2355-5p.
hsa-miR-520g, hsa-miR-520h, hsa-miR-3910-1, hsa-miR-3616, hsa-miR-8075, hsa-miR-6776, hsa-miR-6075, hsa-miR-532, hsa-miR-320b-1, hsa-miR-548y, hsa-miR-4788, hsa-miR-4431, hsa-miR-1289-2, hsa-miR-548au, hsa-miR-6850, hsa-miR-561, hsa-miR-4672, hsa-miR-3160-1, hsa-miR-3160-2, hsa-miR-8089, hsa-miR-6081, hsa-miR-892b, hsa-miR-345, hsa-miR-3188, hsa-miR-4487, hsa-miR-3150b, hsa-miR-7706 and hsa-miR-4445.
These differentially expressed miRNA sequences are illustrated below in Table 1, along with the reference/house-keeping small RNAs cel-miR-39-3p, U6 and ScaRNA17 used as controls. Cel-miR-39-3p is a spike-in control that demonstrates the stability of the RNA samples. U6 and ScaRNA17 are used as internal controls to normalize the readings of the rest of the miRNAs or candidate miRNAs.
The mean fold change for hsa-miR-335-5p, hsa-miR-3613-3p and hsa-miR-6865-3p PARKmiRs between PD patients and healthy controls are shown below in Table 2 and illustrated in
The qPCR technique of Example 2 was used to identify potential diagnostic biomarkers. It was determined that combinations of hsa-miR-335-5p and hsa-miR-6865-3p show high predictability for PD diagnosis. The results of the model with hsa-miR-335-5p and hsa-miR-6865-3p, Outcome = PD (YES/NO), n = 164 cases + 182 controls are shown below in Table 3.
ROC analysis based on predicted probabilities compared to true disease status is depicted in
Following the protocol of Example 3 it was determined that combinations of hsa-miR-335-5p and hsa-miR-3613-3p also show high predictability for PD diagnosis. The results of the model with hsa-miR-335-5p and hsa-miR-3613-3p, Outcome = PD (YES/NO), n = 164 cases + 182 controls are shown above in Table 3.
ROC analysis based on predicted probabilities from the model showing strong discriminating ability are depicted in
From the foregoing Examples 1-4 it is evidenced that any combination of two or more microRNAs from the list of 85 identified miRNAs can be used to diagnose the occurrence of PD in patients.
Table 3 above illustrates that hsa-miR-335-5p shows high predictability for PD diagnosis for Outcome = PD (YES/NO), n = 164 cases + 182 controls.
ROC analysis based on probabilities from the model and compared to true disease status showing strong discriminating ability is shown in
hsa-miR-3613-3p also shows high predictability for PD diagnosis as illustrated in Table 3 above. ROC analysis based on probabilities from the model and compared to true disease status showing strong discriminating ability is shown in
Similarly, hsa-miR-6865-3p also shows high predictability for PD diagnosis as shown in Table 3 above. ROC analysis based on probabilities from the model and compared to true disease status showing strong discriminating ability is shown in
From the foregoing Examples 5-7, it is evidenced that hsa-miR-335-5p, hsa-miR-3613-3p and hsa-miR-6865-3p may be used individually for accurate diagnosis of PD.
The qPCR technique of Example 2 was used to validate the diagnostic biomarkers of Example 2. It was determined that combinations of hsa-miR-335-5p and hsa-miR-6865-3p show high predictability for PD diagnosis. The results of the model with hsa-miR-335-5p and hsa-miR-6865-3p, Outcome = PD (YES/NO), n = 42 cases + 22 controls are shown below in Table 4.
ROC analysis based on predicted probabilities compared to true disease status is depicted in
Following the protocol of Example 3 it was determined that combinations of hsa-miR-335-5p and hsa-miR-3613-3p also show high predictability for PD diagnosis. The results of the model with hsa-miR-335-5p and hsa-miR-3613-3p, Outcome = PD (YES/NO), n = 42 cases + 22 controls are shown above in Table 4.
ROC analysis based on predicted probabilities from the model showing strong discriminating ability are depicted in
Following the protocol of Example 3 it was determined that combinations of hsa-miR-3613-3p and hsa-miR-6865-5p also show high predictability for PD diagnosis. The results of the model with hsa-miR-3613-3p and hsa-miR-6865-5p, Outcome = PD (YES/NO), n = 42 cases + 22 controls are shown above in Table 4.
ROC analysis based on predicted probabilities from the model showing strong discriminating ability are depicted in
Following the protocol of Example 3 it was determined that combinations of hsa-miR- hsa-miR-335-5p, hsa-miR-3613-3p and hsa-miR-6865-5p also show high predictability for PD diagnosis. The results of the model with hsa-miR-335-5p, hsa-miR-3613-3p and hsa-miR-6865-5p, Outcome = PD (YES/NO), n = 42 cases + 22 controls are shown above in Table 4.
ROC analysis based on predicted probabilities from the model showing strong discriminating ability are depicted in
From the foregoing Example 10 it is evidenced that any combination of three or more microRNAs from the list of 85 identified miRNAs can be used to diagnose the occurrence of PD in patients.
Analysis of hsa-miR-335-5p, hsa-miR-3613-3p and hsa-miR-6865-3p targets using multiple bioinformatics tools show that among others, LRRK2 and Parkin are predicted targets of hsa-miR-335-5p, and SNCA is a predicted target of hsa-miR-3613-3p. The regulation of LRRK2 expression in SHSY-5Y cells as a result of modulation in hsa-miR-335-5p levels was confirmed by western blot analysis. hsa-miR-335-5p was overexpressed (
The target discovery using LC-MS was performed to find novel targets for hsa-miR-335-5p, hsa-miR-3613-3p and hsa-miR-6865-3p.
- a. The proteins with differential expression pattern as a result of hsa-miR-335-5p modulation include acadsb, slc4a7, lnp/kiaa1715, supt5h, sdhd. Wdr1, cmpk1, slc25a1, hmgcs1, twf2, ppp1r18, exoc8, tm9sf4, kif16b, dnajc2, sel1l, hectd1, gmppb.
- b. The proteins with differential expression pattern as a result of hsa-miR-3613-3p modulation include wdr1, gmppb, hmbs, eml4, hebp1, apmap/c20orf3, sord, pcyt2, stat3, top2a, skiv2l2, cdc20, myo1e, ttll 12, atad2, carm1, arfgap1, ppp4r1, nde1/ndel1.
- c. The proteins with differential expression pattern as a result of hsa-miR-6865-3p modulation include wdr1, ppp1r18, ppp4r1, ube2h, ube3c, stx16, ube4h, gtf2f1, map1b, ube2a, dusp3, arhgap1, nsun2, acox1, fkbp10, fam107b, pofut1, tomm22, hspb8, sbds.
Measurement of levels of a combination of two or more miRNAs in serum from patients can assist in distinctly differentiating between a potential PD patient and a healthy individual. A serum sample is obtained from blood withdrawn from patients suspected of PD. The serum is used for total microRNA isolation and enrichment. This RNA would then be tested using qPCR to measure the levels of any two or more of the 85 miRNAs mentioned in Example 1, or any one of three miRNAs mentioned in Examples 5-7. Detectable levels of any two or more of the 85 miRNAs or any one of the three miRNAs confirms the patient has PD. If desired, other sample fluids may be utilized, including plasma, venous or arterial blood, or CSF samples withdrawn by lumbar puncture. Such plasma, blood or CSF samples are processed as above. It will be understood that measurement of more than two miRNAs in combination or a set of combinations used in a test matrix may desirably increase the accuracy of PD diagnosis.
Since a combination of miRNA can be used for diagnosis it may be advisable to test all the candidates to eliminate any cohort-based variation. It is understood that any detectable amounts of relevant miRNA will indicate PD pathology. However, those of ordinary skill in the art recognize it may be clinically helpful to use values of 164 v 182 samples to set an artificial threshold for diagnosis. Differential miRNA levels can be used to develop diagnostic biomarker kits that can be used by clinicians in diagnosis as well as in clinical trials. In this study the presence and quantification of miRNA from serum was determined by qRT-PCR which amplifies and quantifies the RNA is question. Other suitable techniques known to those of ordinary skill herein may be alternatively utilized, including use of labeled antisense sequences and labeled antibodies. Suitable antibodies are preferentially selective, referring to a binding reaction between two molecules that is typically more than 10 to 100 times background molecular associations under measurement conditions. Thus, under designated immunoassay conditions, the specified antibodies bind to a particular miRNA sequence, thereby identifying its presence. Specific binding to an antibody under such conditions requires an antibody that is selected for its specificity for a particular miRNA. For example, antibodies raised against a particular miRNA can be selected by subtracting out antibodies that cross-react with other molecules. A variety of immunoassay formats may be used to select antibodies specifically immunoreactive with a particular miRNA including solid-phase ELISA immunoassays (see, e.g.,
Many neurodegenerative diseases are closely related to each other when it comes to symptoms as well as pathological markers. The circulating diagnostic markers for one neurodegenerative disease can be useful for diagnosis of other disease. A method to diagnose other neurodegenerative diseases like Dementia with Lewy body (DLB), Amyotrophic lateral sclerosis (ALS), Alzheimer's disease (AD), Multiple system atrophy (MSA), CorticoBasal Degeneration (CBD), Progressive Supranuclear Palsy (PSP) can also be developed using similar miRNA measurements of candidates mentioned above. Disease specific kits can be developed similar to one mentioned in [0037] with various combinations of miRNAs listed in [0019].
The miRNAs detected in one or more combinations can regulate several proteins in the cells. Novel protein targets for PD can be discovered using these microRNAs and their combinations. The involvement of these proteins in PD etiology can be further established to target them for therapy.
We have experimentally confirmed the predicted regulation of LRRK2 by hsa-miR-335-5p and SNCA by hsa-miR-3613-3p in dopaminergic neuronal cell lines. Therapeutic intervention to regulate the novel targets mentioned can be achieved by RNA interference technologies.
Small nucleic acid molecules derived from miRNAs mentioned in [0019] will be designed to therapeutically intervene by specifically targeting genes in PD brains to achieve complete or partial remedy. The effects shown in [0040] will be achieved for precise targeting in brain cells.