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Phosphoinositides and PIPs01:42

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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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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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Related Experiment Video

Updated: Dec 18, 2025

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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Phosphoinositide Lipids in Ocular Tissues.

Ammaji Rajala1,2, Austin McCauley1,2, Richard S Brush1,2

  • 1Departments of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.

Biology
|June 18, 2020
PubMed
Summary

Phosphoinositides (PIs) are crucial for cell function. This study quantises specific PIs in ocular tissues, revealing their presence and informing potential treatments for ocular diseases.

Keywords:
cellular signalingcorneaphosphoinositidesretinaretinal pigment epithelium

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Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Ophthalmology

Background:

  • Inositol phospholipids, or phosphoinositides (PIs), are key regulators of diverse cellular processes.
  • PIs are dynamically interconverted by PI kinases and phosphatases, influencing functions like vesicular transport and cell signaling.
  • Previous ocular research focused on PI enzymes; this study directly measures PI levels in ocular tissues.

Purpose of the Study:

  • To quantify specific phosphoinositide (PI) levels in the cornea, retinal pigment epithelium (RPE), and retina.
  • To establish baseline PI levels in healthy ocular tissues for comparison with disease states.
  • To provide foundational data for understanding PI roles in ocular health and disease.

Main Methods:

  • Utilized PI-binding proteins as probes to detect and quantify specific phosphoinositides (PIs).
  • Measured levels of PI(3)P, PI(4)P, PI(3,4)P2, PI(4,5)P2, and PI(3,4,5)P3.
  • Analyzed PI levels in three distinct ocular compartments: cornea, RPE, and retina.

Main Results:

  • All five examined phosphoinositides (PIs) were detected in the cornea, RPE, and retina.
  • Established the presence of PI(3)P, PI(4)P, PI(3,4)P2, PI(4,5)P2, and PI(3,4,5)P3 in all tested ocular tissues.
  • Provides a quantitative baseline for these critical signaling lipids in ocular tissues.

Conclusions:

  • Specific phosphoinositides (PIs) are present in the cornea, RPE, and retina.
  • Findings support the role of PI signaling in ocular physiology.
  • This data will aid in managing disorders related to abnormal phosphoinositide metabolism in ocular tissues.