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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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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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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
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Plasma Membrane Epichaperome-Lipid Interface: Regulating Dynamics and Trafficking.

Haneef Ahmed Amissah1,2, Ruslana Likhomanova3, Gabriel Opoku4

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Summary

The epichaperome-plasma membrane lipid axis, involving heat shock proteins (HSPs) and lipid domains, regulates cell membrane properties crucial for stress response and cellular integrity. This axis offers potential therapeutic targets for cancer treatment.

Keywords:
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • The plasma membrane (PM) is vital for eukaryotic cell defense against stress and maintaining homeostasis.
  • Membrane-bound chaperones and lipid domains interact to influence PM properties.

Purpose of the Study:

  • To explore the partnership between chaperones and lipid domains, termed the "epichaperome-plasma membrane lipid axis."
  • To understand how this axis modulates PM fluidity, curvature, and signaling for cellular integrity.

Main Methods:

  • Investigated heat shock protein (HSP) recruitment to the PM using in vitro and in vivo models.
  • Analyzed functional outcomes including ion channel activity, membrane fluidity, endocytosis, and exosome release.
  • Examined pathological effects in cancer, focusing on lipid-chaperone crosstalk and drug resistance.

Main Results:

  • HSP accumulation at the PM is essential for regulating membrane physical state and function.
  • The epichaperome-plasma membrane lipid axis impacts ion channel activity, membrane fluidity, and cellular transport processes.
  • Dysregulated lipid-chaperone interactions in cancer contribute to drug resistance via altered membrane signaling.

Conclusions:

  • The epichaperome-plasma membrane lipid axis is a key regulator of cellular stress responses and membrane function.
  • Targeting this axis, through strategies like Membrane Lipid Therapy (MLT), shows promise for cancer treatment by modulating membrane properties and signaling.