The intertwined epidemics of obesity and diabetes have produced a public health crisis that demands an improved understanding of fat biology and metabolism. Through genetic screens in C. elegans and D. melanogaster, we identified many genetic regulators of invertebrate fat storage/metabolism that also have a conserved role in mammals. We focused our attention on one gene, Adipose (Adp), because its striking anti-obesity and anti-diabetes function in worms, flies, and mammals highlight its importance in metabolism and potential as a therapeutic target. The goal of this proposal is to unravel the physiological and molecular mechanisms underlying these striking effects. Our hope is that these metabolic and molecular studies will enhance our understanding of mammalian metabolism and lead to novel therapeutic strategies for obesity and diabetes. Adp regulates an ancient metabolic pathway. Reducing Adp function in worms, flies, mammalian adipogenic cells, and mice stimulates fat formation (obesity) and Adp mutant flies and mice have diabetes. These effects result from actions of Adp within adipocytes, as adipocyte-restricted expression of dominant negative Adp in mice caused obesity and diabetes. Conversely, fat selective expression of wild-type Adp produces lean, glucose sensitive flies and mice. Yet, there remain several unexplored issues relating to the in vivo metabolic phenotypes.
In Aim I, we will characterize the metabolic physiology of our various invertebrate and mouse models in which Adp action is modified. These studies will rigorously test our hypothesis that altered energy expenditure underlies the anti-obesity actions of Adp. Then, we will examine how Adp regulates the responses to high fat diet and other metabolically relevant stimuli (Aims I and II). In parallel (Aim III), we unravel the molecular mechanisms underlying the Adp effects. Our initial studies show that Adp binds to and functions with several Adp interacting proteins (AIPs) that regulate chromatin dynamics and gene transcription. A unifying mechanism for how Adp regulates these AIPs stems from our data that Adp appears to control the substrate specificity of a novel ubiquitin E3 ligase complex.
In Aim III, we will characterize the role that this E3 ligase has in fat biology;knowledge that is key in order to develop the fundamental insights required to ultimately manipulate the Adp pathway for therapeutic ends.

Public Health Relevance

The ability to regulate fat storage and metabolism are fundamental processes. However, the dual epidemics of obesity and diabetes endanger millions and are altering our health care landscape. This crisis that could be addressed by identifying genes that influence fat biology and metabolism. Because of striking biological, molecular, and biochemical properties, indicating therapeutic potential and novel mechanisms, we focused our attention on one, Adipose (Adp), that has anti-obesity and anti-diabetes functions in worms, flies, and mammals. Our goal is to unravel the physiological and molecular mechanisms underlying conserved these effects, which we believe will enhance our understanding of adipocyte biology and may lead to novel therapeutic targets for obesity and diabetes.

Agency
National Institute of Health (NIH)
Type
Research Project (R01)
Project #
5R01DK064261-10
Application #
8683154
Study Section
Integrative Physiology of Obesity and Diabetes Study Section (IPOD)
Program Officer
Haft, Carol R
Project Start
Project End
Budget Start
Budget End
Support Year
10
Fiscal Year
2014
Total Cost
Indirect Cost
Name
University of Texas Sw Medical Center Dallas
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
City
Dallas
State
TX
Country
United States
Zip Code
75390
Berry, Daniel C; Jiang, Yuwei; Graff, Jonathan M (2016) Mouse strains to study cold-inducible beige progenitors and beige adipocyte formation and function. Nat Commun 7:10184
Berry, Daniel C; Jiang, Yuwei; Arpke, Robert W et al. (2016) Cellular Aging Contributes to Failure of Cold-Induced Beige Adipocyte Formation in Old Mice and Humans. Cell Metab :
Zeve, Daniel; Millay, Douglas P; Seo, Jin et al. (2016) Exercise-Induced Skeletal Muscle Adaptations Alter the Activity of Adipose Progenitor Cells. PLoS One 11:e0152129
Ugrankar, Rupali; Berglund, Eric; Akdemir, Fatih et al. (2015) Drosophila glucome screening identifies Ck1alpha as a regulator of mammalian glucose metabolism. Nat Commun 6:7102
Lapid, Kfir; Lim, Ajin; Clegg, Deborah J et al. (2014) Oestrogen signalling in white adipose progenitor cells inhibits differentiation into brown adipose and smooth muscle cells. Nat Commun 5:5196
Jiang, Yuwei; Berry, Daniel C; Tang, Wei et al. (2014) Independent stem cell lineages regulate adipose organogenesis and adipose homeostasis. Cell Rep 9:1007-22
Stenesen, Drew; Suh, Jae Myoung; Seo, Jin et al. (2013) Adenosine nucleotide biosynthesis and AMPK regulate adult life span and mediate the longevity benefit of caloric restriction in flies. Cell Metab 17:101-12
Berry, Daniel C; Stenesen, Drew; Zeve, Daniel et al. (2013) The developmental origins of adipose tissue. Development 140:3939-49
Hatley, Mark E; Tang, Wei; Garcia, Matthew R et al. (2012) A mouse model of rhabdomyosarcoma originating from the adipocyte lineage. Cancer Cell 22:536-46
Zeve, Daniel; Seo, Jin; Suh, Jae Myoung et al. (2012) Wnt signaling activation in adipose progenitors promotes insulin-independent muscle glucose uptake. Cell Metab 15:492-504

Showing the most recent 10 out of 17 publications