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Alicia Rey1, Francesco Petrelli1, Diana Panfilova1

  • 1Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, 1005 Lausanne, Switzerland.

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Summary
This summary is machine-generated.

Lipid droplets (LDs) are abundant in the brain, contrary to previous assumptions. Optimized methods reveal more LDs, especially in aged brains, but require caution due to autofluorescence.

Keywords:
BD493/503CP: cell biologyCP: imagingagingautofluorescencebrainlipid dropletslipophilic dyesneuroscienceperilipinstaining

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Area of Science:

  • Neurobiology
  • Cell Biology
  • Biochemistry

Background:

  • Lipid droplets (LDs) are crucial for lipid storage but their role in the brain remains unclear.
  • Conventional methods using lipophilic dyes or antibodies detect few LDs in healthy brain tissue.
  • An endogenous LD-reporter mouse revealed abundant LDs, creating a discrepancy with existing detection techniques.

Purpose of the Study:

  • To investigate the discrepancy in LD detection between conventional methods and an endogenous reporter mouse.
  • To optimize protocols for accurate LD detection in brain tissue.
  • To determine the abundance and characteristics of LDs in young and aged healthy brains.

Main Methods:

  • Comparative analysis of different lipophilic dyes (e.g., BODIPY 493/503) for LD visualization in brain tissue.
  • Evaluation of antibody-based detection sensitivity to tissue preparation and detergent treatments.
  • Utilizing an endogenous LD-reporter mouse model for LD identification.
  • Optimizing tissue preparation protocols for enhanced LD detection.

Main Results:

  • The lipophilic dye BODIPY 493/503 showed poor performance in brain tissue.
  • Alternative lipophilic dyes and optimized antibody-based detection revealed numerous LDs in healthy brain tissue, consistent with the reporter mouse.
  • LDs are abundant in both young and aged healthy brains.
  • Aged mice exhibited larger LDs compared to young mice.
  • Autofluorescence in aged brain tissue complicates LD detection.

Conclusions:

  • LDs are significantly more abundant in the healthy brain than previously thought.
  • Tissue preparation and choice of detection method critically impact LD visualization in brain.
  • Optimized protocols confirm widespread LD presence across ages, with age-related changes in LD size.
  • Careful consideration of autofluorescence is necessary for accurate LD analysis in aged brain samples.