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Updated: Apr 10, 2026

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Plasma membranes: does one model fit all?

Tore Skotland1, Kirsten Sandvig2

  • 1Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital-The Norwegian Radium Hospital, Oslo 0379, Norway; Centre for Cancer Cell Reprogramming, Faculty of Medicine, University of Oslo, Oslo 0379, Norway.

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|April 8, 2026
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Summary
This summary is machine-generated.

Biological membranes exhibit lipid asymmetry, maintained by ATP and Ca2+ dependent enzymes. A new model for human erythrocyte plasma membranes (PMs) proposes lipid and cholesterol overabundance in specific leaflets, but its applicability to other cell types requires further investigation.

Keywords:
asymmetrycholesterollipidsmembranesphospholipase A2sphingomyelinase

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Membrane Biophysics

Background:

  • Biological membranes feature a lipid bilayer with asymmetric lipid distribution between leaflets.
  • This asymmetry is actively maintained by enzymes regulated by intracellular ATP and calcium (Ca2+) levels.

Purpose of the Study:

  • To critically evaluate a recently proposed model for human erythrocyte plasma membranes (PMs).
  • To discuss the implications of this model for PMs in other cell types.

Main Methods:

  • Literature review and critical analysis of existing data.
  • Comparative analysis of lipid composition across different cell types.

Main Results:

  • The proposed erythrocyte PM model suggests a 50% excess of diacyl lipids in the cytosolic leaflet.
  • This is reportedly compensated by a threefold increase in cholesterol within the outer leaflet.
  • Significant differences in lipid composition exist between erythrocytes and other cell types.

Conclusions:

  • The applicability of the new erythrocyte membrane model to other cell types is questionable due to compositional variations.
  • Further research is needed to determine the universality of this proposed lipid asymmetry model.