Multiple sclerosis: lessons from molecular neuropathology

Experimental Neurology
H Lassmann

Abstract

Multiple sclerosis (MS) is an inflammatory disease of the central nervous system, which leads to widespread focal lesions of primary demyelination with variable axonal, neuronal and astroglia injury. The mechanisms responsible for tissue injury in the MS brain and spinal cord are only incompletely understood. In this review we discuss that the formation of confluent subpial cortical lesions is the most specific type of tissue damage, which is exclusively present in MS patients. Current data suggest that subpial demyelination is triggered by a soluble factor, which is produced in meningeal inflammatory infiltrates and diffuses into the cortical parenchyma, where it destroys myelin either directly or indirectly through microglia activation. The presence of demyelinating activity in sera and cerebrospinal fluid of MS patients is known for decades, but the molecular nature of the possibly underlying demyelinating factor is still unclear. Destruction of myelin sheaths and oligodendrocytes as well as neurodegeneration in MS are associated with massive oxidative stress and mitochondrial injury. Oxidative stress appears to be driven in early MS by activated microglia and oxidative burst and is, in the progressive stage of the disease, ...Continue Reading

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