Increased expression of Nogo-A in hippocampal neurons of patients with temporal lobe epilepsy

The European Journal of Neuroscience
Christine E BandtlowGünther Sperk

Abstract

Mesial temporal lobe epilepsy (TLE) is associated with pronounced anatomical and biochemical changes in the hippocampal formation including extensive neurodegeneration, reorganization of mossy fibres and sprouting of interneurons. Although the anatomical features and some of the physiological consequences of hippocampal remodeling have been well documented, the molecular mechanisms underlying the profound and orientated outgrowth of hippocampal neurons in TLE are not yet understood. The reticulon protein Nogo-A has been associated with an inhibitory action on axon growth and plasticity. Using immunohistochemistry and in situ hybridization, we investigated the expression of Nogo-A in specimens obtained at surgery from patients with TLE compared with those obtained from autopsy controls. In control specimens, Nogo-A immunoreactivity and mRNA were mainly confined to oligodendrocytes. Only approximately 40% of the specimens revealed low expression of Nogo-A mRNA in neurons. In contrast, in TLE patients with and without Ammon's horn sclerosis, Nogo-A mRNA and immunoreactivity were markedly up-regulated in most neurons (3.6- and 4.4-fold increases in Nogo-A mRNA in granule cells of sclerotic and nonsclerotic specimens) and their proc...Continue Reading

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Jan 26, 2011·Proceedings of the National Academy of Sciences of the United States of America·Andrea DelekateMartin Korte
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