Heat shock protein expression in cerebral X-linked adrenoleukodystrophy reveals astrocyte stress prior to myelin loss

A L Görtz, L A N Peferoen, W H Gerritsen, J M van Noort, M Bugiani, S Amor

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

AIMS: X-linked adrenoleukodystrophy (X-ALD) is a genetic white matter disorder in which demyelination occurs due to accumulation of very long-chain fatty acids. Inflammation in the brain white matter is a hallmark of the pathology of cerebral X-ALD, but the underlying pathogenic mechanisms are still largely unknown. In other inflammatory demyelinating disorders, such as multiple sclerosis, the expression of heat shock proteins (HSPs) in combination with interferon-γ (IFN-γ) has been suggested to play a prominent role in the initiation of demyelination and inflammation. We therefore investigated these pathways in X-ALD lesions.

METHODS: By immunohistochemistry, we examined the expression of small HSPs (HSPB1, HSPB5, HSPB6, HSPB8) and higher molecular weight HSPs (HSPA, HSPD1), and the expression of elements of the IFN-γ pathway on autopsy material of five patients with X-ALD.

RESULTS: The expression of the larger HSPs, HSPA and HSPD1, as well as small HSPs is increased in X-ALD lesions compared with normal-appearing white matter. Such upregulation can already be detected before demyelination and inflammation occur, and it is predominant in astrocytes. The IFN-γ pathway does not seem to play a leading role in the observed inflammation.

CONCLUSIONS: The finding that astrocytes show signs of cellular stress before demyelination suggests that they play a major role early in the pathogenesis of cerebral X-ALD, and may therefore be involved in the initiation of inflammation and demyelination.

Original languageEnglish
Pages (from-to)363-376
Number of pages14
JournalNeuropathology and Applied Neurobiology
Volume44
Issue number4
Early online date20 Mar 2017
DOIs
Publication statusPublished - 1 Jun 2018

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