The long-term objectives of this proposal are to understand the function of mammalian Sir2 in the endocrine control of aging and longevity by the insulin/IGF-I system in mammals. Recent studies have demonstrated that insulin/IGF-I signaling pathways play critical roles in regulating the pace of aging and longevity in worms, flies and mice. Additionally, caloric restriction, which extends life span in a wide variety of organisms, reduces blood insulin and IGF-I levels in mammals. The Sir2 (silent information regulator 2) nicotinamide adenine dinucleotide (NAD)-dependent deacetylases have been demonstrated to link glucose metabolism to the mechanism of aging and longevity in yeast and C. elegans. We have found evidence that mammalian Sir2 plays an important role in regulating transcription in pancreatic beta cells. Based on our preliminary findings presented in this proposal, it is hypothesized that mammalian Sir2 controls glucose metabolism, aging and longevity by regulating transcription of specific genes required for the insulin-producing function of pancreatic b cells through its NAD-dependent deacetylase activity. This hypothesis will be addressed by the following specific aims: 1) examine insulin gene expression and insulin secretion in mouse primary islets infected with recombinant adenovirus carrying Sir2 cDNA or siRNA, 2) elucidate the molecular mechanism of mammalian Sir2-mediated transcriptional regulation by examining expression and modification of important transcriptional regulators in beta cells, and 3) examine the in vivo function of mammalian Sir2 in b cells by measuring multiple physiological parameters for glucose homeostasis in beta cell-specific Sir2 transgenic mice. These studies should provide a molecular framework to understand the function of mammalian Sir2 in beta cells, glucose metabolism and longevity control in mammals.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
5R01AG024150-04
Application #
7247845
Study Section
Special Emphasis Panel (ZRG1-CMAD (01))
Program Officer
Finkelstein, David B
Project Start
2004-09-01
Project End
2008-06-30
Budget Start
2007-07-01
Budget End
2008-06-30
Support Year
4
Fiscal Year
2007
Total Cost
$293,771
Indirect Cost
Name
Washington University
Department
Other Basic Sciences
Type
Schools of Medicine
DUNS #
068552207
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
Lin, Jonathan B; Kubota, Shunsuke; Ban, Norimitsu et al. (2016) NAMPT-Mediated NAD(+) Biosynthesis Is Essential for Vision In Mice. Cell Rep 17:69-85
Stromsdorfer, Kelly L; Yamaguchi, Shintaro; Yoon, Myeong Jin et al. (2016) NAMPT-Mediated NAD(+) Biosynthesis in Adipocytes Regulates Adipose Tissue Function and Multi-organ Insulin Sensitivity in Mice. Cell Rep 16:1851-60
Yoon, Myeong Jin; Yoshida, Mitsukuni; Johnson, Sean et al. (2015) SIRT1-Mediated eNAMPT Secretion from Adipose Tissue Regulates Hypothalamic NAD+ and Function in Mice. Cell Metab 21:706-17
Stein, Liana Roberts; Zorumski, Charles F; Imai, Shin-Ichiro et al. (2015) Nampt is required for long-term depression and the function of GluN2B subunit-containing NMDA receptors. Brain Res Bull 119:41-51
Ghisays, Fiorella; Brace, Cynthia S; Yackly, Shawn M et al. (2015) The N-Terminal Domain of SIRT1 Is a Positive Regulator of Endogenous SIRT1-Dependent Deacetylation and Transcriptional Outputs. Cell Rep :
Stein, Liana Roberts; Wozniak, David F; Dearborn, Joshua T et al. (2014) Expression of Nampt in hippocampal and cortical excitatory neurons is critical for cognitive function. J Neurosci 34:5800-15
Stein, Liana R; Imai, Shin-ichiro (2014) Specific ablation of Nampt in adult neural stem cells recapitulates their functional defects during aging. EMBO J 33:1321-40
Imai, Shin-ichiro; Guarente, Leonard (2014) NAD+ and sirtuins in aging and disease. Trends Cell Biol 24:464-71
Satoh, Akiko; Imai, Shin-ichiro (2014) Systemic regulation of mammalian ageing and longevity by brain sirtuins. Nat Commun 5:4211
Imai, S; Yoshino, J (2013) The importance of NAMPT/NAD/SIRT1 in the systemic regulation of metabolism and ageing. Diabetes Obes Metab 15 Suppl 3:26-33

Showing the most recent 10 out of 34 publications