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Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various  biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin,...
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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
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Phospholipid-derived lysophospholipids in (patho)physiology.

Patricia Prabutzki1, Jürgen Schiller1, Kathrin M Engel1

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Lysophosphatidylcholine (LPC), abundant in damaged tissues, plays a dual role in health and disease. Understanding LPC

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Aortic valvesAtherosclerosisLysophosphatidylcholineLysophospholipidsPhospholipase A(2)PhospholipidsReactive oxygen species

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathophysiology

Background:

  • Phospholipids (PL) are crucial cellular membrane components.
  • Changes in PL metabolism are linked to disease pathogenesis.
  • Lysophosphatidylcholine (LPC) is abundant in oxidatively damaged tissues.

Purpose of the Study:

  • To review the role of Lysophosphatidylcholine (LPC) in physiological processes and disease.
  • To highlight LPC as the most abundant lysophospholipid in mammals.
  • To explore the therapeutic potential of targeting LPC metabolism.

Main Methods:

  • Literature review focusing on Lysophosphatidylcholine (LPC).
  • Analysis of LPC's origins, including phospholipase A2 activity and reactive oxygen species (ROS).
  • Examination of LPC's signaling pathways (GPCRs, TLRs) and involvement in disease.

Main Results:

  • LPC is formed via phosphatidylcholine (PC) cleavage or ROS reactions.
  • Increased LPC can result from decreased re-acylation of LPC into PC.
  • LPC induces lymphocyte migration, oxidative stress, and pro-inflammatory cytokine production.
  • LPC concentration and composition vary in different physiological and pathological conditions.
  • LPC signaling via G protein-coupled and Toll-like receptors implicates it in disease development.

Conclusions:

  • Lysophosphatidylcholine (LPC) has complex roles in inflammation and disease.
  • LPC's involvement in signaling pathways and its variable concentrations underscore its significance.
  • Targeting LPC metabolism for restoring homeostasis presents a potential therapeutic strategy for inflammatory diseases.