Frontotemporal dementia (FTD) or frontotemporal lobar degeneration (FTLD) is a group of heterogeneous sporadic and familial neurodegenerative disorders. They are the second most common cause of dementia after Alzheimer's disease (AD) in patients <65 and ~50% of FTLD patients develop abundant tau pathologies in neurons and glia (FTLD-Tau). Exciting new data from Project 2 and provocative recent reports provide models to test novel hypothesis concerning mechanisms of tauopathies. The first hypothesis we test is based on our recent observations that introduction of small amounts of exogenous tau fibril "seeds" into tau overexpressing cells recruits endogenous tau to fibrillize into abundant tau filamentous structures seeded by the exogenously introduced tau fibrils. These results suggest a "seeding" mechanism of tau tangle pathogenesis whereby fibrillar tau "seeds" serve as a "nidus" for recruiting soluble tau into fibrillar aggregates that enlarge as a result. The second hypothesis we test is based on recent data that tau fibrils spread from cell-to-cell in vitro and in tau transgenic (Tg) mouse models consistent with the notion of a prion-like mechanism for the propagation and spreading of tau pathology and disease progression. Successful completion of the studies to test these hypotheses here will address fundamental disease mechanisms of FTLD-Tau, which, in conjunction with research advances from other projects in this PPG will accelerate efforts to find better therapeutic interventions for patients with diverse FTLDs.

Public Health Relevance

Project 2 will provide in depth understanding on the fundamental disease mechanisms for tauopathies in general and FTLD-Tau in particular. This knowledge, together with the model systems developed in Project 2 will accelerate efforts to develop more effective therapies for the treatment of patients with FTLD-Tau and other tauopathies such as AD.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Program Projects (P01)
Project #
5P01AG017586-14
Application #
8645561
Study Section
Special Emphasis Panel (ZAG1-ZIJ-4)
Project Start
Project End
Budget Start
2014-03-01
Budget End
2015-02-28
Support Year
14
Fiscal Year
2014
Total Cost
$267,683
Indirect Cost
$97,366
Name
University of Pennsylvania
Department
Type
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
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