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- W1970356687 abstract "Three experiments were conducted to examine the role of histamine in neuronal degeneration in a rat model of Wernick's encephalopathy induced by an acute bout of pyrithiamine-induced thiamine deficiency (PTD). In the first experiment, histamine levels in medial thalamus of freely moving PTD rats measured by microdialysis were increased (180% of controls) at a prelesion stage of thiamine deficiency (treatment day 12) and further elevated 48 hr later (380%) in the same animals when necrosis was evident. Histamine levels in dialysates of the hippocampus collected simultaneously from the same animals were unchanged at either stage of thiamine deficiency. Glutamate levels in microdialysates from the same animals were unchanged at the prelesion stage but were significantly elevated on the second collection day. In a second experiment, separate groups of PTD and pairfed control (CT) rats were infused continuously with either α-fluoromethylhistidine (FMH; 80 mg/day, i. p.), an irreversible inhibitor of histamine synthesis, or saline. FMH pretreatment produced a significant protection against PTD-induced neuronal loss within the midline-intralaminar and anteromedial thalamic nuclei, but had no effect on damage to ventrolateral nuclei, anteroventral nucleus, or the mammillary bodies. In a third study, histamine (80 μg, free base) or vehicle was directly infused into the same region of medial thalamus dialyzed in experiments 1. Histamine infusion into prelesion PTD but not CT animals resulted in severe neuronal loss and gliosis. Infusion of vehicle into the same regions of PTD and CT rats produced a mild gliosis restricted to the needle tract with no evidence of neuronal loss. These observations together with recent evidence of a histamine enhancement of glutamate receptor activation suggest that early histamine release may contribute significantly to glutamate-N-methyl-D-aspartate (NMDA)-mediated excitotoxic neuronal death in thiamine deficiency-induced Wernicke's encephalopathy. © 1994 Wiley-Liss, Inc." @default.
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- W1970356687 date "1994-08-01" @default.
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- W1970356687 title "Histamine-mediated neuronal death in a rat model of Wernicke's encephalopathy" @default.
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- W1970356687 doi "https://doi.org/10.1002/jnr.490380509" @default.
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