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Bi-directional alterations of LTP after acute homocysteine exposure
Louisa A Christie1, Gernot Riedel, Bettina Platt
1School of Medical Sciences, College of Life Sciences and Medicine, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen AB25 2ZD Scotland, UK. l-christie@northwestern.edu
Abstract:
Homocysteine (HCY) is a known risk factor for neuronal diseases. We here report that HCY (10-1000 microM) interfered bi-directionally with long-term potentiation (LTP) in hippocampal slices, causing an impairment at concentrations <100 microM, and enhancement > or =500 microM. By comparison, NMDA unidirectionally reduced LTP, whereas l-cysteine led to facilitated LTP. Such HCY-induced alterations in neuronal communication may contribute to cognitive failure in dementia.
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