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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
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Updated: Apr 26, 2026

Profiling the Triacylglyceride Contents in Bat Integumentary Lipids by Preparative Thin Layer Chromatography and MALDI-TOF Mass Spectrometry
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alpha-Tocopheryl phosphate--an active lipid mediator?

Jean-Marc Zingg1, Mohsen Meydani, Angelo Azzi

  • 1JM USDA-Human Nutr. Res. Ctr. On Aging, Tufts University, Boston, MA, USA.

Molecular Nutrition & Food Research
|February 20, 2010
PubMed
Summary
This summary is machine-generated.

Alpha-tocopheryl phosphate (alphaTP), a vitamin E derivative, shows unique regulatory roles beyond acting as a pro-vitamin E. Research explores its molecular functions and potential as a lipid mediator in cellular processes.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Alpha-tocopheryl phosphate (alphaTP) is a derivative of vitamin E (alpha-tocopherol, alphaT).
  • Enzymes capable of alphaT phosphorylation and alphaTP dephosphorylation exist.
  • alphaTP supplementation in animals yields plasma concentrations similar to alphaT.

Purpose of the Study:

  • To review the molecular and cellular activities of alphaTP.
  • To discuss the functions of alphaTP as a natural compound, cofactor, and lipid mediator.
  • To explore alphaTP's role in signal transduction and gene expression.

Main Methods:

  • In vitro and in vivo studies were analyzed.
  • Literature review of alphaTP's effects on enzymes, cell proliferation, apoptosis, and gene expression.
  • Examination of alphaTP's molecular mechanisms, including cofactor activity and membrane alteration.

Main Results:

  • In vitro, alphaTP modulates enzyme activity.
  • In cell culture, alphaTP influences proliferation, apoptosis, signal transduction, and gene expression.
  • In vivo, alphaTP prevents atherosclerosis and ischemia/reperfusion injury, and enhances hippocampal long-term potentiation.

Conclusions:

  • alphaTP possesses regulatory activities distinct from its pro-vitamin E function.
  • alphaTP may act as a cofactor or a lipid mediator, influencing cellular processes.
  • Further research into alphaTP's roles in signal transduction and gene expression is warranted.