Skeletal muscle is the primary pathway of glucose disposal in the body through glucose uptake, storage as glycogen, and/or oxidation. Hence the development, progression and treatment of type 2 diabetes (T2D) are intimately related to the regulation of energy metabolism in muscle. We propose to apply iterative computational modeling in conjunction with both in vitro and in vivo experimentation to uncover the integrated control of energy metabolism in muscle and determine how its regulation is altered in disease (T2D). We will develop computer models of muscle energy metabolism by utilizing the substantial foundation of software and data resources that we have established. Models will be parameterized and validated based on kinetic time- course experiments using purified mitochondria and in vivo 31P-magnetic resonance spectroscopy. Data will be obtained from male Wistar rats (normoglycemic) and the Goto Kakizaki rat model of T2D (hyperglycemic) to identify functional differences between these groups. We will determine how whole body glucose disposal is altered in T2D by coordination of the pathways of glucose and fatty acid uptake and disposal (glycogen synthesis, glycogenolysis, fatty acid oxidation, TCA cycle, and oxidative phosphorylation) using experimental protocols defined by the modeling effort. Our goal is to quantitatively describe and understand the regulation of skeletal muscle oxidative metabolism in both healthy and T2D animals. Furthermore, thorough understanding of the mechanism of action of exercise, the putative targets influenced by exercise may generate new approaches to prevention of the disease and potentially identify new targets for diabetes treatment.

Public Health Relevance

We propose to use computer simulation of the biochemical processes involved in glucose uptake and utilization in muscle to uncover mechanistic dysfunction that arises in the early stages of type 2 diabetes. By determining and validating novel mechanisms that impair the ability of muscle to dispose of glucose, we will attain fundamental new insights into how this disease and how its progression might be slowed or even reversed.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK095210-04
Application #
8828677
Study Section
Modeling and Analysis of Biological Systems Study Section (MABS)
Program Officer
Sechi, Salvatore
Project Start
2012-04-15
Project End
2017-03-31
Budget Start
2015-04-01
Budget End
2016-03-31
Support Year
4
Fiscal Year
2015
Total Cost
Indirect Cost
Name
University of Michigan Ann Arbor
Department
Physiology
Type
Schools of Medicine
DUNS #
073133571
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
Moxley, Michael A; Vinnakota, Kalyan C; Bazil, Jason N et al. (2018) Systems-level computational modeling demonstrates fuel selection switching in high capacity running and low capacity running rats. PLoS Comput Biol 14:e1005982
Tonson, Anne; Noble, Kayle E; Meyer, Ronald A et al. (2017) Age Reduces Microvascular Function in the Leg Independent of Physical Activity. Med Sci Sports Exerc 49:1623-1630
Vinnakota, Kalyan C; Singhal, Abhishek; Van den Bergh, Françoise et al. (2016) Open-Loop Control of Oxidative Phosphorylation in Skeletal and Cardiac Muscle Mitochondria by Ca(2.). Biophys J 110:954-61
Moxley, Michael A; Beard, Daniel A; Bazil, Jason N (2016) Global Kinetic Analysis of Mammalian E3 Reveals pH-dependent NAD+/NADH Regulation, Physiological Kinetic Reversibility, and Catalytic Optimum. J Biol Chem 291:2712-30
Vinnakota, Kalyan C; Bazil, Jason N; Van den Bergh, Françoise et al. (2016) Feedback Regulation and Time Hierarchy of Oxidative Phosphorylation in Cardiac Mitochondria. Biophys J 110:972-80
Oki, Kentaro; Halievski, Katherine; Vicente, Laura et al. (2015) Contractile dysfunction in muscle may underlie androgen-dependent motor dysfunction in spinal bulbar muscular atrophy. J Appl Physiol (1985) 118:941-52
Moxley, Michael A; Beard, Daniel A; Bazil, Jason N (2014) A pH-dependent kinetic model of dihydrolipoamide dehydrogenase from multiple organisms. Biophys J 107:2993-3007
Brault, Jeffrey J; Pizzimenti, Natalie M; Dentel, John N et al. (2013) Selective inhibition of ATPase activity during contraction alters the activation of p38 MAP kinase isoforms in skeletal muscle. J Cell Biochem 114:1445-55
Oki, Kentaro; Wiseman, Robert W; Breedlove, S Marc et al. (2013) Androgen receptors in muscle fibers induce rapid loss of force but not mass: implications for spinal bulbar muscular atrophy. Muscle Nerve 47:823-34
Schmitz, J P J; Groenendaal, W; Wessels, B et al. (2013) Combined in vivo and in silico investigations of activation of glycolysis in contracting skeletal muscle. Am J Physiol Cell Physiol 304:C180-93