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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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Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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Linking phosphoinositide function to mitosis.

Lorenzo Prever1, Gabriele Squillero1, Emilio Hirsch1

  • 1University of Turin, Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center "Guido Tarone", Via Nizza 52, 10126 Turin, Italy.

Cell Reports
|June 6, 2024
PubMed
Summary
This summary is machine-generated.

Phosphoinositides (PtdIns) are crucial lipid messengers regulating cell division. Dysregulation of PtdIns dynamics during mitosis can disrupt essential processes like cell rounding and cytokinesis, impacting cell proliferation.

Keywords:
CP: Cell biology

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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
  • Molecular Biology
  • Lipid Signaling

Background:

  • Phosphoinositides (PtdIns) are vital lipid second messengers controlling cellular processes.
  • They are localized to cellular membranes and their phosphorylation state is dynamically regulated by kinases and phosphatases.
  • PtdIns signaling influences cell homeostasis, proliferation, and membrane remodeling.

Purpose of the Study:

  • To review the known functions of phosphoinositides during mitosis.
  • To discuss how PtdIns dynamics impact key cell division events.
  • To explore the consequences of altered PtdIns metabolism on cell division.

Main Methods:

  • Literature review and synthesis of existing research on phosphoinositides in cell division.
  • Analysis of temporal and spatial roles of PtdIns during mitosis.
  • Discussion of regulatory mechanisms involving PtdIns kinases and phosphatases.

Main Results:

  • PtdIns play critical roles in temporally regulated membrane remodeling events of mitosis.
  • Specific PtdIns species recruit distinct binding proteins that control mitotic progression.
  • Aberrant PtdIns production or removal interferes with cell rounding, spindle orientation, cytokinesis, and abscission.

Conclusions:

  • Phosphoinositides are essential regulators of mitosis, influencing multiple stages of cell division.
  • Understanding PtdIns dynamics is key to comprehending proper cell division and its dysregulation.
  • Alterations in PtdIns metabolism represent a potential mechanism for cell division defects.