Lysophospholipids induce innate immune transdifferentiation of endothelial cells, resulting in prolonged endothelial activation

The Journal of Biological Chemistry
Xinyuan LiXiao-Feng Yang

Abstract

Innate immune cells express danger-associated molecular pattern (DAMP) receptors, T-cell costimulation/coinhibition receptors, and major histocompatibility complex II (MHC-II). We have recently proposed that endothelial cells can serve as innate immune cells, but the molecular mechanisms involved still await discovery. Here, we investigated whether human aortic endothelial cells (HAECs) could be transdifferentiated into innate immune cells by exposing them to hyperlipidemia-up-regulated DAMP molecules, i.e. lysophospholipids. Performing RNA-seq analysis of lysophospholipid-treated HAECs, we found that lysophosphatidylcholine (LPC) and lysophosphatidylinositol (LPI) regulate largely distinct gene programs as revealed by principal component analysis. Metabolically, LPC up-regulated genes that are involved in cholesterol biosynthesis, presumably through sterol regulatory element-binding protein 2 (SREBP2). By contrast, LPI up-regulated gene transcripts critical for the metabolism of glucose, lipids, and amino acids. Of note, we found that LPC and LPI both induce adhesion molecules, cytokines, and chemokines, which are all classic markers of endothelial cell activation, in HAECs. Moreover, LPC and LPI shared the ability to transdif...Continue Reading

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