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Xin Rong, … , David A. Ford, Peter Tontonoz
Published August 28, 2017
Citation Information: J Clin Invest. 2017;127(10):3640-3651. https://doi.org/10.1172/JCI93616.
Citation Information: J Clin Invest. 2017;127(10):3640-3651. https://doi.org/10.1172/JCI93616.
Abstract
Sterol regulatory element–binding protein 1c (SREBP-1c) is a central regulator of lipogenesis whose activity is controlled by proteolytic cleavage. The metabolic factors that affect its processing are incompletely understood. Here, we show that dynamic changes in the acyl chain composition of ER phospholipids affect SREBP-1c maturation in physiology and disease. The abundance of polyunsaturated phosphatidylcholine in liver ER is selectively increased in response to feeding and in the setting of obesity-linked insulin resistance. Exogenous delivery of polyunsaturated phosphatidylcholine to ER accelerated SREBP-1c processing through a mechanism that required an intact SREBP cleavage–activating protein (SCAP) pathway. Furthermore, induction of the phospholipid-remodeling enzyme LPCAT3 in response to liver X receptor (LXR) activation promoted SREBP-1c processing by driving the incorporation of polyunsaturated fatty acids into ER. Conversely, LPCAT3 deficiency increased membrane saturation, reduced nuclear SREBP-1c abundance, and blunted the lipogenic response to feeding, LXR agonist treatment, or obesity-linked insulin resistance. Desaturation of the ER membrane may serve as an auxiliary signal of the fed state that promotes lipid synthesis in response to nutrient availability.
Authors
Xin Rong, Bo Wang, Elisa N.D. Palladino, Thomas Q. de Aguiar Vallim, David A. Ford, Peter Tontonoz
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