We plan to further the study of the function of SIRT1 in mice.
In Aim 1 we study whether SIRT1 (and other sirtuin) activity declines aging. This study will include a detailed analysis of NAD and NADH levels in cellular compartments of muscle, heart and brain.
In Aim 2 we will determine the effects of depletion or augmentation of SIRT1 in brown fat, muscle, heart and 2-cells.
This aim will employ tissue specific deletion and over- expression of SIRT1 in mice.
In Aim 3 we will study the effects of SIRT1 on bone. This study will use mice knocked out for SIRT1 in osteoblasts or osteoclasts to determine mechanisms by which SIRT1 determines bone density.
This aim will also study how calorie restriction affects bone.
In Aim 4 we will study the role of SIRT1 in T cells. In this aim we will study immune function in T cell-specific SIRT1 knockout mice and determine the mechanism by which SIRT1 functions in these immune cells.

Public Health Relevance

Sirtuins regulate life span in lower organisms and may mediate some of the effects of calorie restriction. We plan to determine the functions of mammalian sirtuins, with emphasis on SIRT1, in multiple cell types in mice. These studies may suggest new strategies to treat diseases of aging.

National Institute of Health (NIH)
National Institute on Aging (NIA)
Research Project (R01)
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Cellular Mechanisms in Aging and Development Study Section (CMAD)
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Guo, Max
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Massachusetts Institute of Technology
Schools of Arts and Sciences
United States
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Das, Abhirup; Huang, George X; Bonkowski, Michael S et al. (2018) Impairment of an Endothelial NAD+-H2S Signaling Network Is a Reversible Cause of Vascular Aging. Cell 173:74-89.e20
Ondracek, Caitlin R; Frappier, Vincent; Ringel, Alison E et al. (2017) Mutations that Allow SIR2 Orthologs to Function in a NAD+-Depleted Environment. Cell Rep 18:2310-2319
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Herskovits, Adrianna Z; Locascio, Joseph J; Peskind, Elaine R et al. (2013) A Luminex assay detects amyloid ? oligomers in Alzheimer's disease cerebrospinal fluid. PLoS One 8:e67898
Yao, Hongwei; Hwang, Jae-woong; Sundar, Isaac K et al. (2013) SIRT1 redresses the imbalance of tissue inhibitor of matrix metalloproteinase-1 and matrix metalloproteinase-9 in the development of mouse emphysema and human COPD. Am J Physiol Lung Cell Mol Physiol 305:L615-24

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