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Related Concept Videos

Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

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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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IP3/DAG Signaling Pathway01:11

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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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Cytoskeletal Coordination in Cell Migration01:32

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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What are Second Messengers?01:12

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Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
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Amplifying Signals via Second Messengers01:15

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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Intracellular Signaling Affects Focal Adhesions01:17

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Related Experiment Video

Updated: Mar 30, 2026

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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[Phosphoinositides: the lipids coordinating cell dynamics].

Julien Viaud1, Bernard Payrastre2

  • 1Inserm UMR 1048, institut des maladies métaboliques et cardiovasculaires (I2MC), université Toulouse III Paul-Sabatier, 1, avenue Jean Poulhès, BP 84225, 31432 Toulouse cedex 04, France.

Medecine Sciences : M/S
|November 19, 2015
PubMed
Summary
This summary is machine-generated.

Phosphoinositides are vital cell membrane lipids regulating cell dynamics through protein interactions. Their precise control by enzymes is crucial for cell signaling and implicated in diseases, highlighting their therapeutic potential.

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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
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Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation
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Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
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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
  • Molecular Biology

Background:

  • Phosphoinositides are minor components of eukaryotic cell membranes.
  • They act as critical spatiotemporal organizers of cell dynamics.
  • They interact with proteins to coordinate cellular processes.

Purpose of the Study:

  • To highlight the critical role of phosphoinositides in cell dynamics.
  • To explain the regulatory mechanisms involving phosphoinositide kinases and phosphatases.
  • To underscore the implications of phosphoinositides in human diseases and therapeutic strategies.

Main Methods:

  • Literature review on phosphoinositide function and regulation.
  • Analysis of protein-lipid interactions.
  • Discussion of enzymatic control of phosphoinositide metabolism.
  • Review of clinical relevance and therapeutic targeting.

Main Results:

  • Phosphoinositides coordinate multiprotein complexes essential for cell signaling, trafficking, and cytoskeleton rearrangement.
  • Kinases and phosphatases precisely regulate phosphoinositide levels and interconversions.
  • Dysregulation of these lipids is linked to genetic diseases, cancer, and infections.

Conclusions:

  • Phosphoinositides are essential regulators of fundamental cellular processes.
  • Enzymatic control of phosphoinositides is critical for maintaining cellular homeostasis.
  • Targeting phosphoinositide metabolism offers promising therapeutic avenues for various human pathologies.