Increased expression of ER stress- and hypoxia-associated molecules in grey matter lesions in multiple sclerosis.

Multiple Sclerosis : Clinical and Laboratory Research
Jill McMahonUna FitzGerald

Abstract

The endoplasmic reticulum (ER) stress pathway may play a role in the pathogenesis multiple sclerosis (MS), and while ER stress-associated molecules have been demonstrated in white matter (WM) lesions, these have not been analysed in grey matter (GM) demyelination. The objective was to characterise the type and frequency of GM lesions and establish expression profiles of ER stress- and hypoxia-associated markers. Sections from 16 MS cases and 12 non-MS controls were stained for ER stress molecules (BiP and CHOP) and hypoxia-associated D110 antigen. Of the GM lesions analysed, 24% were type 1 (continuous between GM and WM), 22% were type 2 (entirely within GM) and the majority (54%) were type 3 (extending from pia mater). Comparison of GM lesions, MS normal-appearing grey matter (NAGM) and non-MS control tissue showed that NAGM, type 1 and type 3 lesions all had significantly increased levels of CHOP compared to controls. According to morphological and dual-labelling criteria, the majority of CHOP-positive cells were microglia. Approximately 50% of GM lesions contained D110-positive cells. These data suggest that ER stress plays an important role in GM lesion development and may be critical in activation of microglia in pre-lesio...Continue Reading

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Mar 12, 2013·Antioxidants & Redox Signaling·Djordje Miljković, Ivan Spasojević
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