Lysosphingolipids and sphingolipidoses: Psychosine in Krabbe's disease

Stefka Spassieva, Erhard Bieberich

Research output: Contribution to journalReview article

16 Scopus citations

Abstract

Until recently, lipids were considered inert building blocks of cellular membranes. This changed three decades ago when lipids were found to regulate cell polarity and vesicle transport, and the “lipid raft” concept took shape. The lipid-driven membrane anisotropy in form of “rafts” that associate with proteins led to the view that organized complexes of lipids and proteins regulate various cell functions. Disturbance of this organization can lead to cellular, tissue, and organ malfunction. Sphingolipidoses, lysosomal storage diseases that are caused by enzyme deficiencies in the sphingolipid degradation pathway, were found to be particularly detrimental to the brain. These enzyme deficiencies result in accumulation of sphingolipid metabolites in lysosomes, although it is not yet clear how this accumulation affects the organization of lipids in cellular membranes. Krabbe's disease (KD), or globoid cell leukodystrophy, was one of the first sphingolipidosis for which the raft concept offered a potential mechanism. KD is caused by mutations in the enzyme β-galactocerebrosidase; however, elevation of its substrate, galactosylceramide, is not observed or considered detrimental. Instead, it was found that a byproduct of galactosylceramide metabolism, the lysosphingolipid psychosine, is accumulated. The “psychosine hypothesis” has been refined by showing that psychosine disrupts lipid rafts and vesicular transport critical for the function of glia and neurons. The role of psychosine in KD is an example of how the disruption of sphingolipid metabolism can lead to elevation of a toxic lysosphingolipid, resulting in disruption of cellular membrane organization and neurotoxicity.

Original languageEnglish (US)
Pages (from-to)974-981
Number of pages8
JournalJournal of Neuroscience Research
Volume94
Issue number11
DOIs
StatePublished - Nov 1 2016

Keywords

  • enzyme deficiencies
  • galactosylceramide
  • galactosylsphingosine
  • lipid rafts
  • psychosine
  • β-galactocerebrosidase

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

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