The tau protein plays a fundamental role in the cytoarchitecture of the brain and in axonal transport;however, its function and regulation can be disrupted as it becomes hyperphosphorylated and aggregated in a family of neurodegenerative diseases termed tauopathies. Tau mutation is causative for the tauopathy frontotemporal dementia and parkinsonism linked to chromosome 17 (FTDP-17t) while tau polymorphisms are associated with an increased risk of other parkinsonisms including progressive supranuclear palsy (PSP), corticobasal degeneration (CBD) and Parkinson disease (PD). Interestingly, PD is not primarily classified as a tauopathy, although a significant subset of cases also develop aggregated, hyperphosphorylated tau pathology. The gene that encodes the tau protein has been repeated identified as a risk locus in genome wide-association studies for PD. Furthermore, the co-PI of this proposal and others have shown that the PD-linked protein alpha-synuclein and tau can interact to exacerbate PD-relevant pathologies. More recently, pathological studies of individuals carrying PD-linked mutations in the LRRK2 gene have shown tau pathology in a subset of mutation carriers. Additionally, transgenic mice expressing LRRK2 with PD-relevant mutations present with abnormally phosphorylated tau. Despite these lines of evidence, the link between PD and tau, specifically through the action of LRRK2, has been largely deemed circumstantial as even the role of LRRK2 in normal biology has been unclear. Our preliminary data suggests that LRRK2 plays a regulatory role in tau biology and that this role may have implications in neurodegenerative diseases. In the current proposal, we will directly assess using several complementary methods including in vitro, cell culture, and transgenic mouse studies if LRRK2 and tau interact in normal and disease biology, providing important insights for the development of novel therapeutic approaches.

Public Health Relevance

Tau protein plays a critical role in both the normal brain and neurodegenerative diseases, most of which occur in the absence of tau mutation. Based on our preliminary data and a growing base of publications, this proposal will determine if the Parkinson's disease-linked protein LRRK2 and tau can interact and how this contributes to normal and disease biology. Understanding the relationship between these disease-relevant proteins could eventually identify targets for therapeutic intervention.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
1R01NS082672-01A1
Application #
8596972
Study Section
Cellular and Molecular Biology of Neurodegeneration Study Section (CMND)
Program Officer
Sieber, Beth-Anne
Project Start
2013-07-01
Project End
2018-06-30
Budget Start
2013-07-01
Budget End
2014-06-30
Support Year
1
Fiscal Year
2013
Total Cost
$320,119
Indirect Cost
$101,369
Name
University of Florida
Department
Neurosciences
Type
Schools of Medicine
DUNS #
969663814
City
Gainesville
State
FL
Country
United States
Zip Code
32611
Sacino, Amanda N; Brooks, Mieu; Thomas, Michael A et al. (2014) Amyloidogenic ?-synuclein seeds do not invariably induce rapid, widespread pathology in mice. Acta Neuropathol 127:645-65
Bailey, Rachel M; Covy, Jason P; Melrose, Heather L et al. (2013) LRRK2 phosphorylates novel tau epitopes and promotes tauopathy. Acta Neuropathol 126:809-27