Demyelination causes synaptic alterations in hippocampi from multiple sclerosis patients.

Abstract:

OBJECTIVE:Multiple Sclerosis (MS) is an inflammatory demyelinating disease of the human central nervous system. Although the clinical impact of gray matter pathology in MS brains is unknown, 30 to 40% of MS patients demonstrate memory impairment. The molecular basis of this memory dysfunction has not yet been investigated in MS patients. METHODS:To investigate possible mechanisms of memory impairment in MS patients, we compared morphological and molecular changes in myelinated and demyelinated hippocampi from postmortem MS brains. RESULTS:Demyelinated hippocampi had minimal neuronal loss but significant decreases in synaptic density. Neuronal proteins essential for axonal transport, synaptic plasticity, glutamate neurotransmission, glutamate homeostasis, and memory/learning were significantly decreased in demyelinated hippocampi, but not in demyelinated motor cortices from MS brains. INTERPRETATION:Collectively, these data support hippocampal demyelination as a cause of synaptic alterations in MS patients and establish that the neuronal genes regulated by myelination reflect specific functions of neuronal subpopulations.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Dutta R,Chang A,Doud MK,Kidd GJ,Ribaudo MV,Young EA,Fox RJ,Staugaitis SM,Trapp BD

doi

10.1002/ana.22337

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

445-54

issue

3

eissn

0364-5134

issn

1531-8249

journal_volume

69

pub_type

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