Work in C. elegans has defined a signaling pathway that controls longevity and response to stress. Loss of function alleles of the insulin-growth factor receptor (Daf-2) or PI3'K (age-1) lead to 2-3x longer life and powerful resistance to stressors such as UV irradiation, oxidative insult and heat. All of these beneficial actions are mediated by the transcription factor, Daf-16. While Daf-16 is widely expressed, the pro-longevity effects are mediated by Daf-16 activity in specific tissues. This indicates that Daf-16 participate in a conversation among tissues that ensures coordinated responses to environmental changes and metabolic function. Mammals have four Daf-16 orthologs and FOXO3 is the phylogenetically the closest - based on sequence and function. Promotion of nuclear localization of FOXO3 is strongly neuroprotective in multiple models of neurodegeneration. Understanding the role of FOXO3 in vivo will require spatio-temporal control of its nuclear localization. In this tool-development proposal we will make transgenic mice in which FOXO3 is fused to the ligand binding domain of the estrogen receptor (a tamoxifen-sensitive version called "ERT"). When inserted into the CAGGS-floxed-STOP vector we will be able to express FOXO3 in a cell-type specific manner and drive it nuclear by administration of tamoxifen. In this proposal we will characterize these mice for transgene leakiness, tissue specific expression, off target effects and tamoxifen inducibility of FOXO3 target gene expression. The deliverable of this proposal is a versatile mouse that permits spatio-temporal control of FOXO3 gene transcription.

Public Health Relevance

Observations made in model organisms and petri dishes indicate that a specific protein called FOXO3 has profound protective properties against insults that cause Amyotrophic Lateral Sclerosis (ALS), also known as Lou Gehrig's Disease. In this tool- development proposal I will make a mouse that will allow us to study the spatio- temporal role of FOXO3 in mouse models of disease.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21AG042179-02
Application #
8445215
Study Section
Cellular and Molecular Biology of Neurodegeneration Study Section (CMND)
Program Officer
Velazquez, Jose M
Project Start
2012-04-01
Project End
2014-03-31
Budget Start
2013-05-15
Budget End
2014-03-31
Support Year
2
Fiscal Year
2013
Total Cost
$197,859
Indirect Cost
$79,734
Name
Children's Hospital of Philadelphia
Department
Type
DUNS #
073757627
City
Philadelphia
State
PA
Country
United States
Zip Code
19104