Methods for diagnosis and treatment of amyotrophic lateral sclerosis based on an increased level of interaction between TDP-43 polypeptide and NF-KB P65 polypeptide
The present invention provides methods and uses for the diagnostic of a subject predisposed or suspected of developing a neurodegenerative disease or suffering from a neurodegenerative disease. The present invention also relates to methods and uses for identifying candidate compounds and to compounds for treating neurodegenerative disease. The present invention also relates to an animal model for neurodegenerative disease.
1. A method for the diagnosis and treatment of a subject predisposed or suspected of developing amyotrophic lateral sclerosis (ALS), the method comprising the steps of:
contacting a TDP-43 polypeptide with an anti-TDP-43 polypeptide specific antibody in a biological sample of the subject;
contacting a NF-κB p65 polypeptide with an anti-NF-κB p65 polypeptide specific antibody in the biological sample;
detecting the level of interaction between the TDP-43 polypeptide and the NF-κB p65 polypeptide by ELISA, radioimmunoassay, immunoprecipitation assay, Western blot assay, electrophoretic mobility shift assay (EMSA) or immunostaining assay;
wherein detecting a level of interaction between TDP-43 polypeptide and NF-κB p65 polypeptide in the biological sample at least 1.5-fold higher than a reference level of interaction between TDP-43 polypeptide and NF-κB p65 polypeptide indicates that the subject is predisposed or suspected of developing ALS or is suffering from ALS;
diagnosing the subject predisposed or suspected of developing ALS or suffering from ALS;
treating the subject predisposed or suspected of developing ALS or suffering from ALS with an effective amount of a compound indicated for halting the progression of ALS or reducing the pathological manifestations of ALS;
wherein the reference level is the level in a subject not suffering from ALS;
wherein the TDP-43 polypeptide comprises the polypeptide of SEQ ID NO: 1;
wherein the NF-κB p65 polypeptide comprises the polypeptide of SEQ ID NO: 3.
2. The method of claim 1 , wherein the level of interaction between TDP-43 polypeptide and NF-κB p65 polypeptide is at least 1.8-fold higher than the reference.
3. The method of claim 1 , wherein the NF-κB p65 polypeptide interacts with the N-terminal portion of TDP-43 polypeptide.
4. The method of claim 1 , wherein the NF-κB p65 polypeptide interacts with a RNA recognition motif (RRM) domain of TDP-43 polypeptide.
5. The method of claim 1 , wherein the level of interaction between TDP-43 polypeptide and NF-κB p65 polypeptide is determined by ELISA.
6. The method of claim 1 , wherein the biological sample is from blood, urine, cerebrospinal fluid, cortical neurons, microglial cells, myeloid cells or spinal cord extract.
7. The method of claim 1 wherein the determination of the level of interaction between TDP-43 polypeptide and NF-κB p65 polypeptide is repeated after a time interval in order to monitor the progression or regression of ALS, and wherein detecting an increased level of interaction between TDP-43 polypeptide and NF-κB p65 polypeptide over the time interval indicates a progression of ALS and wherein observing a decreased level of interaction between TDP-43 polypeptide and NF-κB p65 polypeptide over the time interval indicates a regression of ALS.
8. The method of claim 7 , wherein the time interval is hourly, daily, weekly, monthly or yearly.
9. The method of claim 1 wherein the compound is a withanolide.
10. The method of claim 9 wherein the withanolide is withaferin A.
11. The method of claim 1 where the compound is an anti-TDP-43 antibody.