Nile Red fluorescence spectroscopy reports early physicochemical changes in myelin with high sensitivity

Wulin Teo, Andrew V. Caprariello, Megan L. Morgan, Antonio Luchicchi, Geert J. Schenk, Jeffrey T. Joseph, Jeroen J.G. Geurts, Peter K. Stys*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The molecular composition of myelin membranes determines their structure and function. Even minute changes to the biochemical balance can have profound consequences for axonal conduction and the synchronicity of neural networks. Hypothesizing that the earliest indication of myelin injury involves changes in the composition and/or polarity of its constituent lipids, we developed a sensitive spectroscopic technique for defining the chemical polarity of myelin lipids in fixed frozen tissue sections from rodent and human. The method uses a simple staining procedure involving the lipophilic dye Nile Red, whose fluorescence spectrum varies according to the chemical polarity of the microenvironment into which the dye embeds. Nile Red spectroscopy identified histologically intact yet biochemically altered myelin in prelesioned tissues, including mouse white matter following subdemyelinating cuprizone intoxication, as well as normal-appearing white matter in multiple sclerosis brain. Nile Red spectroscopy offers a relatively simple yet highly sensitive technique for detecting subtle myelin changes.

Original languageEnglish
Article numbere2016897118
JournalProceedings of the National Academy of Sciences of the United States of America
Volume118
Issue number8
DOIs
Publication statusPublished - 23 Feb 2021

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