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Dysfunction of Iron Metabolism and Iron-Regulatory Proteins in the Rat Hippocampus After Heat Stroke.

Shock. 2019 Jun;51(6):780-786. doi:10.1097/SHK.0000000000001182
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摘要


Heat stroke, the most serious type of heat illness, refers to the presence of hyperthermia (core temperature >40°C), accompanied by central nervous system dysfunction. The hippocampus is a particularly vulnerable region in the early stage of heat stroke. Increasing evidence suggests that dysregulation of brain iron metabolism is involved in many neurodegenerative diseases. However, whether heat stroke causes dysfunction of iron metabolism, as well as iron-regulatory proteins, in the hippocampus remains unknown. The present study was conducted to explore the effects on spatial learning and memory, as well as iron content, ferroportin 1 (Fpn1), and hepcidin expression in the hippocampus after heat stroke in rats. Compared with the Sham group, learning ability and memory declined in rats after heat stroke. Iron concentration was significantly increased in the hippocampus. Expression of Fpn1 protein significantly decreased in the hippocampus, while expression of hepcidin increased. Interestingly, Fpn1 mRNA expression in the hippocampus increased. Our data thereby indicate that heat stroke can decrease learning ability and memory in rats. The mechanism may be related to changes of iron levels, as well as Fpn1 and hepcidin expression, in the hippocampus. Furthermore, hepcidin may rapidly decrease cellular Fpn1 protein levels, even under conditions of iron loading, indicating that hepcidin is a more dominant regulator of Fpn1 than is iron.

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