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Related Experiment Video

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Imaging Plasma Membrane Deformations With pTIRFM
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Imaging and Manipulation of Plasma Membrane Fatty Acid Clusters Using TOF-SIMS Combined Optogenetics.

Chi Zhang1, Kenji Kikushima1,2, Mizuki Endo3

  • 1Department of Cellular and Molecular Anatomy, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan.

Cells
|January 8, 2023
PubMed
Summary

Fatty acids (FAs) on the plasma membrane (PM) form clusters, influencing membrane properties. Researchers developed an optogenetic tool to manipulate these FA clusters, offering new insights into PM heterogeneity and potential disease treatments.

Keywords:
TOF-SIMSfatty acid imagingmembrane heterogeneityoptogeneticsplasma membrane fatty acids

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • The plasma membrane (PM) exhibits molecular heterogeneity crucial for cell function.
  • Fatty acid (FA) distribution significantly impacts PM physical properties and lateral heterogeneity.
  • The precise distribution patterns of PM FAs remain largely uncharacterized.

Purpose of the Study:

  • To investigate the distribution of fatty acids (FAs) within the plasma membrane (PM).
  • To propose and test the FA cluster hypothesis, suggesting FAs exist in clustered formations.
  • To develop and utilize a novel optogenetic tool for manipulating PM FA distribution.

Main Methods:

  • Development of an optogenetic tool to translocate the endoplasmic reticulum (ER) and manipulate PM FA distribution.
  • Application of time-of-flight combined secondary ion mass spectrometry (TOF-SIMS) for high-resolution imaging of PM FAs.
  • Quantitative analysis of FA clustering and colocalization patterns.

Main Results:

  • Confirmed that PM FAs are distributed as clusters, supporting the FA cluster hypothesis.
  • Demonstrated that the optogenetic tool can manipulate FA clusters as intact units.
  • Identified multi-FA clusters formed by the colocalization of different FAs.
  • Showed that the optogenetic tool reduces FA cluster degree and multi-FA cluster formation.

Conclusions:

  • Plasma membrane FAs exist and are manipulated as clusters, contributing to PM heterogeneity.
  • The developed optogenetic tool provides a novel method for studying PM lipid organization.
  • Findings suggest potential therapeutic strategies for diseases linked to PM lipid aggregation.