- PROJECT 3: ESTABLISHING CLINICAL UTILITY OF CSF BIOMARKERS FOR PD Accurate diagnosis of Parkinson's disease (PD) and monitoring of PD patients remain challenging and preclude the most effective patient care. Although the NINDS and other PD patient advocacy groups such as the Michael J. Fox Foundation have recognized the need for both diagnostic and prognostic PD biomarkers, no such biomarkers have been validated thus far. This Clinical Research Project will utilize Multiple Reaction Monitoring-Mass Spectrometry (MRM-MS) to determine if specific protein phosphorylation events can be used as novel PD-specific diagnostic/prognostic biomarkers. Previous research has shown that the non-receptor tyrosine kinase, c-Abl, phosphorylates ?Synuclein at the Y-39 site and Parkin at the Y-143 site. During PD, dysregulation of these two pathways ultimately leads to neuronal cell death, which in turn leads to the clinical manifestations of PD. In preliminary studies, we have already developed MRM-MS based quantitative assays to monitor these phosphorylated and unphosphorylated forms of ?-Synuclein and Parkin in CSF samples. Our hypothesis is that dysregulation of c- Abl signaling cascade is intrinsically linked to PD pathogenesis and that the relative phosphorylation state of downstream c-Abl substrates, ?-Synuclein and Parkin, should provide a sensitive read-out for the presence and/or the severity of PD.
Aim 1 will measure the relative concentration of the Y-39 tryptic peptide of ?-Synuclein in both its phosphorylated and unphosphorylated forms in the CSF of PD patients and controls. This assay will be employed in several clinical cohorts to determine whether the phosphorylated Y-39 residue can function as (i) a diagnostic marker by differentiating between PD patients and controls and/or (ii) a prognostic PD marker in patients that can be used for assessment of early and late (more severe) stages of PD.
Aim 2 will adopt the same approach as described in Aim 1 to test whether c-Abl mediated phosphorylation of Parkin at Y-143 can be used to facilitate either diagnosis with PD or patient monitoring as a function of disease severity. Taken together, this project will identify and validate c-Abl substrates as novel diagnostic/prognostic protein-based biomarkers that have the potential to provide clinicians with novel strategies for establishing a definitive diagnosis of PD and/or for monitoring the severity of disease in patients with PD.

Public Health Relevance

Currently, there is no clinical biomarker that has been approved for use in diagnosis or monitoring of Parkinson's Disease. The goal of this project is to use multiple reaction monitoring mass spectrometry (MRM- MS) to evaluateknown c-Abl substrates (phosphorylated Tyrosine-39 of alpha-synuclein and phosphorylated Tyrosine-143 of Parkin) as diagnostic/prognostic CSF-based biomarkers for PD.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Specialized Center (P50)
Project #
2P50NS038377-16
Application #
8882847
Study Section
Special Emphasis Panel (ZNS1-SRB-J (07))
Project Start
Project End
Budget Start
2014-09-30
Budget End
2015-07-31
Support Year
16
Fiscal Year
2014
Total Cost
$243,000
Indirect Cost
$93,000
Name
Johns Hopkins University
Department
Type
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Mills, Kelly A; Mari, Zoltan; Bakker, Catherine et al. (2016) Gait function and locus coeruleus Lewy body pathology in 51 Parkinson's disease patients. Parkinsonism Relat Disord 33:102-106
Mao, Xiaobo; Ou, Michael Tianhao; Karuppagounder, Senthilkumar S et al. (2016) Pathological α-synuclein transmission initiated by binding lymphocyte-activation gene 3. Science 353:
Geiger, Joshua T; Arthur, Karissa C; Dawson, Ted M et al. (2016) C9orf72 Hexanucleotide Repeat Analysis in Cases with Pathologically Confirmed Dementia with Lewy Bodies. Neurodegener Dis 16:370-2
Mata, Ignacio F; Leverenz, James B; Weintraub, Daniel et al. (2016) GBA Variants are associated with a distinct pattern of cognitive deficits in Parkinson's disease. Mov Disord 31:95-102
Rosenthal, Liana S; Drake, Daniel; Alcalay, Roy N et al. (2016) The NINDS Parkinson's disease biomarkers program. Mov Disord 31:915-23
Jo, Junghyun; Xiao, Yixin; Sun, Alfred Xuyang et al. (2016) Midbrain-like Organoids from Human Pluripotent Stem Cells Contain Functional Dopaminergic and Neuromelanin-Producing Neurons. Cell Stem Cell 19:248-57
Karuppagounder, Senthilkumar S; Xiong, Yulan; Lee, Yunjong et al. (2016) LRRK2 G2019S transgenic mice display increased susceptibility to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-mediated neurotoxicity. J Chem Neuroanat 76:90-97
Davis, Marie Y; Johnson, Catherine O; Leverenz, James B et al. (2016) Association of GBA Mutations and the E326K Polymorphism With Motor and Cognitive Progression in Parkinson Disease. JAMA Neurol 73:1217-1224
Nucifora Jr, Frederick C; Nucifora, Leslie G; Ng, Chee-Hoe et al. (2016) Ubiqutination via K27 and K29 chains signals aggregation and neuronal protection of LRRK2 by WSB1. Nat Commun 7:11792
Mills, Kelly A; Mari, Zoltan; Pontone, Gregory M et al. (2016) Cognitive impairment in Parkinson's disease: Association between patient-reported and clinically measured outcomes. Parkinsonism Relat Disord 33:107-114

Showing the most recent 10 out of 206 publications