Alzheimer's disease (AD) is an age-related neurodegenerative disorder associated with progressive functional decline, dementia and neuronal loss affecting approximately 40 percent of persons over the age of 85 years. The demographics make evident that as the median age of the world's population increases, the prevalence and socioeconomic burden of AD will increase substantially. Pathological hallmarks of the disease include amyloid beta (A3) plaques and neurofibrillary tangles, which play a key role in the pathogenic mechanism of Alzheimer's disease, evolving in a temporal and spatial manner. We are interested in understanding the early mechanisms that cause or perpetuate this temporal and spatial progression of AD pathogenesis. Inflammatory processes have been proposed as being integral for initiating and/or propagating AD-associated pathology within the brain, as the elaboration of inflammatory cytokine expression and other markers of inflammation is more pronounced in individuals with known AD pathology. Recently, a 3xTg-AD mouse model of AD that develops both amyloid and tau pathology has been created, which to date is the most disease-relevant model system depicting what occurs in human Alzheimer's disease. We have observed significant up-regulation of the pro-inflammatory cytokine TNF-a in this model prior to the onset of overt amyloid pathology. As TNF-a has been shown to be enhanced in persons with mild cognitive impairment and Alzheimer's disease, the 3xTg-AD mouse provides a novel paradigm in which to investigate the role of this cytokine during early disease stages. We hypothesize that TNF-a mediated inflammation perpetuates disease in an AD model where genetic predisposition to amyloid and tau pathologies exist and that dampening this inflammatory response will diminish the pathological amyloid and tau outcome. Additionally, we hypothesize that the focal induction of an inflammatory event prior to the onset of inflammation will exacerbate pathological outcomes in a regional and temporal manner. We will administer recombinant adeno-associated virus (rAAV) vectors expressing either TNF-a to create a sustained focal inflammatory response or a TNF receptor antagonist to inhibit the endogenous inflammatory response prior to existing pathology. This work will provide major insight into the involvement of inflammation in the temporal and spatial progression of early AD pathogenic events and may potentially elucidate new therapeutic targets.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
5R01AG026328-04
Application #
7796627
Study Section
Cell Death in Neurodegeneration Study Section (CDIN)
Program Officer
Refolo, Lorenzo
Project Start
2007-04-01
Project End
2012-03-31
Budget Start
2010-04-01
Budget End
2011-03-31
Support Year
4
Fiscal Year
2010
Total Cost
$275,663
Indirect Cost
Name
University of Rochester
Department
Neurology
Type
Schools of Dentistry
DUNS #
041294109
City
Rochester
State
NY
Country
United States
Zip Code
14627
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