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Proc Natl Acad Sci U S A. 2012 Apr 24;109(17):6739-44. doi: 10.1073/pnas.1121060109. Epub 2012 Apr 9.

Kruppel-like factor 15 regulates skeletal muscle lipid flux and exercise adaptation.

Author information

1
Harrington Heart and Vascular Institute and Department of Medicine, Case Western Reserve University School of Medicine and University Hospitals Case Medical Center, Cleveland, OH 44106, USA. saptarsi.haldar@case.edu

Abstract

The ability of skeletal muscle to enhance lipid utilization during exercise is a form of metabolic plasticity essential for survival. Conversely, metabolic inflexibility in muscle can cause organ dysfunction and disease. Although the transcription factor Kruppel-like factor 15 (KLF15) is an important regulator of glucose and amino acid metabolism, its endogenous role in lipid homeostasis and muscle physiology is unknown. Here we demonstrate that KLF15 is essential for skeletal muscle lipid utilization and physiologic performance. KLF15 directly regulates a broad transcriptional program spanning all major segments of the lipid-flux pathway in muscle. Consequently, Klf15-deficient mice have abnormal lipid and energy flux, excessive reliance on carbohydrate fuels, exaggerated muscle fatigue, and impaired endurance exercise capacity. Elucidation of this heretofore unrecognized role for KLF15 now implicates this factor as a central component of the transcriptional circuitry that coordinates physiologic flux of all three basic cellular nutrients: glucose, amino acids, and lipids.

PMID:
22493257
PMCID:
PMC3340075
DOI:
10.1073/pnas.1121060109
[Indexed for MEDLINE]
Free PMC Article

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