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Related Experiment Video

Updated: Jun 26, 2026

Triggering Reactive Gliosis In Vivo by a Forebrain Stab Injury

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Published on: June 29, 2015

Filipin complex-reactive brain lesions: a cautionary tale.

Adeline A Lau¹, Paul J Trim², Barbara M King¹

¹Childhood Dementia Research Group, Flinders Health and Medical Research Institute, Flinders University, Bedford Park, South Australia, 5042, Australia.

Neuropathology and Applied Neurobiology

|December 19, 2023

Summary

Filipin staining for free cholesterol in neurodegenerative disease models is unreliable. This study found filipin cross-reacts with gangliosides, not just cholesterol, necessitating cautious interpretation of results.

Keywords:

Filipin complex Niemann-Pick C cholesterol ganglioside lysosomal mouse mucopolysaccharidosis

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Area of Science:

Biochemistry
Neuroscience
Cell Biology

Background:

Filipin complex is a fluorescent stain used for diagnosing Niemann-Pick Disease Type C (NP-C) and studying cholesterol accumulation in neurodegenerative diseases.
Its susceptibility to photobleaching necessitates the development of quantitative biochemical methods for accurate free cholesterol measurement.
Filipin has been suggested for use in Alzheimer's and Huntington's disease research.

Purpose of the Study:

To establish a quantitative biochemical method for free cholesterol measurement.
To investigate the specificity of filipin staining in neurodegenerative disease models.
To clarify the composition of filipin-reactive inclusions in Sanfilippo syndrome (MPS IIIA) brain tissue.

Main Methods:

Brain tissue from MPS IIIA mice was stained with filipin.
Total and free cholesterol were measured using a commercial kit and a developed LC-MS/MS assay.
Gangliosides GM1, GM2, and GM3 were quantified using LC-MS/MS.

Main Results:

Filipin-positive inclusions were observed in MPS IIIA mouse brains.
No difference in free cholesterol levels was found between MPS IIIA and control mouse brains using either assay.
Filipin was demonstrated to cross-react with GM2 and GM3 gangliosides, explaining the observed inclusions.

Conclusions:

Filipin staining is not specific for free cholesterol.
The observed filipin reactivity in MPS IIIA brain cells is due to cross-reactivity with gangliosides, not cholesterol accumulation.
Positive filipin staining in any context should be interpreted with caution.