A pandemic in obesity-related metabolic diseases has increased at an alarming rate over the last two decades. Lifestyle changes promote limited success for long-term weight management, while many medical interventions have side effects. Reduction in energy efficiency might provide an alternative approach to promote weight loss. As skeletal muscle is an organ with large mass and metabolic demand, energy inefficiency in skeletal muscle would be predicted to promote substantial increase in whole body energy expenditure. Studies in membrane vesicles suggest that energy efficiency of sarco/endoplasmic reticulum (SR/ER) Ca2+-ATPase (SERCA) pump may be modulated by composition of SR phospholipids. In this application, we propose to investigate the role of phosphatidylethanolamine (PE) methylation in regulating muscle energy efficiency. PE methylation is catalyzed by an enzyme PE methyltransferase (PEMT), and mice with whole body deletion of PEMT are protected from diet-induced obesity. We discovered that skeletal muscles from PEMT knockout mice have elevated metabolic rate, which was likely promoted by a reduction in SERCA energy efficiency. We hypothesize that PE methylation deficiency reduces SERCA energy efficiency through its effects on skeletal muscle SR phospholipid composition.
Aim 1 : With tissue-specific inactivation of PEMT, we will determine how PE methylation deficiency affects cellular Ca2+ handling to increase skeletal muscle energy expenditure.
Aim 2 : In multiple experimental models, we will determine whether alterations in muscle SR phospholipids would be sufficient to induce changes in resting metabolic rate and propensity for diet-induced obesity.
Aim 3 : We will derive mechanical efficiency (?) of contracting muscles with PE methylation deficiency. We will also examine whether inactivation of PEMT would augment the anti-obesogenic effect of regular exercise.

Public Health Relevance

Obesity and its associated co-morbidities are major public health problems. In United States, 70.9% of men and 61.9% of women are overweight. Findings from these studies may lead to novel therapeutic approaches to the treatment of the obesity-related diseases.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK107397-05
Application #
10086978
Study Section
Integrative Physiology of Obesity and Diabetes Study Section (IPOD)
Program Officer
Laughlin, Maren R
Project Start
2017-02-01
Project End
2022-01-31
Budget Start
2021-02-01
Budget End
2022-01-31
Support Year
5
Fiscal Year
2021
Total Cost
Indirect Cost
Name
University of Utah
Department
Other Health Professions
Type
Sch Allied Health Professions
DUNS #
009095365
City
Salt Lake City
State
UT
Country
United States
Zip Code
84112
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