Diet-MEF2 interactions shape lipid droplet diversification in muscle to influence Drosophila lifespan.

Aging Cell
Xiao ZhaoJason Karpac

Abstract

The number, size, and composition of lipid droplets can be influenced by dietary changes that shift energy substrate availability. This diversification of lipid droplets can promote metabolic flexibility and shape cellular stress responses in unique tissues with distinctive metabolic roles. Using Drosophila, we uncovered a role for myocyte enhancer factor 2 (MEF2) in modulating diet-dependent lipid droplet diversification within adult striated muscle, impacting mortality rates. Muscle-specific attenuation of MEF2, whose chronic activation maintains glucose and mitochondrial homeostasis, leads to the accumulation of large, cholesterol ester-enriched intramuscular lipid droplets in response to high calorie, carbohydrate-sufficient diets. The diet-dependent accumulation of these lipid droplets also correlates with both enhanced stress protection in muscle and increases in organismal lifespan. Furthermore, MEF2 attenuation releases an antagonistic regulation of cell cycle gene expression programs, and up-regulation of Cyclin E is required for diet- and MEF2-dependent diversification of intramuscular lipid droplets. The integration of MEF2-regulated gene expression networks with dietary responses thus plays a critical role in shapin...Continue Reading

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Citations

Mar 16, 2021·Biochimica Et Biophysica Acta. Molecular and Cell Biology of Lipids·Christoph HeierOleh Lushchak

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Methods Mentioned

BETA
transgenic
genetic modifications
Fluorescence imaging
electron microscopy

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