Aging is due to the accumulation of damage over time that affects the function and survival of the organism;however, it has proven difficult to infer the relative importance of the many processes that contribute to aging. Recent studies in a broad spectrum of model organisms have suggested that interventions that retard the aging process are associated with an increase in mitochondrial respiratory chain activity. However, it is not yet known whether increased mitochondrial activity alone is sufficient to extend animal lifespan. We have developed a novel molecular genetic approach to supplement the endogenous respiratory chain machinery of the fruit fly Drosophila melanogaster and hence increase respiration. The Drosophila system offers many advantages, including all of the molecular, genetic and biochemical tools that have solved many other important biological problems. Our fly model provides a tractable genetic system to directly examine the causal relationship between increased respiration and animal aging. Here, we propose to pursue these studies by exploring three broad questions: 1) What are the effects of increased respiration on animal aging? We will augment respiratory chain activity, in different cells and tissues, and at different stages of the animal's life and investigate the effects on longevity. Our hypothesis is that increased respiration in certain tissues will be sufficient to promote longevity. 2) What are the consequences of increased respiration on life-history traits, age- related behavior and oxidative stress? The hypothesis to be tested is that increased respiration can promote longevity without detrimental side effects on fertility, developmental timing or behavior. 3) What is the relationship between increased respiratory chain activity and established genetic pathways that modulate fly longevity? We will examine the interaction between the insulin/IGF-1 signaling pathway and mitochondrial respiratory chain activity. The work described in this grant proposal will bring about fundamental knowledge in an important area of aging research. At the same time, our findings may lead to new therapeutic approaches to treat age-related diseases in humans.
Advanced age is the greatest risk factor for most cancers and neurodegenerative disorders. We are using the powerful genetics of the fruit fly Drosophila to better understand the basic biology of aging. The long-term aim of this research is to provide novel therapeutic targets to counteract age-related human diseases.
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|Icreverzi, Amalia; de la Cruz, Aida Flor A; Walker, David W et al. (2015) Changes in neuronal CycD/Cdk4 activity affect aging, neurodegeneration, and oxidative stress. Aging Cell 14:896-906|
|Hur, Jae H; Stork, Devon A; Walker, David W (2014) Complex-I-ty in aging. J Bioenerg Biomembr 46:329-35|
|Ulgherait, Matthew; Rana, Anil; Rera, Michael et al. (2014) AMPK modulates tissue and organismal aging in a non-cell-autonomous manner. Cell Rep 8:1767-80|
|Rana, Anil; Rera, Michael; Walker, David W (2013) Parkin overexpression during aging reduces proteotoxicity, alters mitochondrial dynamics, and extends lifespan. Proc Natl Acad Sci U S A 110:8638-43|
|Clark, Rebecca I; Tan, Sharon W S; PÃ©an, Claire B et al. (2013) MEF2 is an in vivo immune-metabolic switch. Cell 155:435-47|
|Hur, Jae H; Bahadorani, Sepehr; Graniel, Jacqueline et al. (2013) Increased longevity mediated by yeast NDI1 expression in Drosophila intestinal stem and progenitor cells. Aging (Albany NY) 5:662-81|
|Rera, Michael; Azizi, Masoud J; Walker, David W (2013) Organ-specific mediation of lifespan extension: more than a gut feeling? Ageing Res Rev 12:436-44|
|Cho, Jaehyoung; Hur, Jae H; Graniel, Jacqueline et al. (2012) Expression of yeast NDI1 rescues a Drosophila complex I assembly defect. PLoS One 7:e50644|
|Rera, Michael; Clark, Rebecca I; Walker, David W (2012) Intestinal barrier dysfunction links metabolic and inflammatory markers of aging to death in Drosophila. Proc Natl Acad Sci U S A 109:21528-33|
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