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- W2000470437 abstract "Brain dopamine has been implicated as a mediator of brain neuronal damage resulting from ischemic injury. Augmented interleukin-1 production and cerebral ischemia occurred during onset of heatstroke. This study has attempted to ascertain whether heatstroke resulting from hyperthermia causes an increase in hypothalamic dopamine release and to assess whether the administration of an interleukin-1 receptor antagonist (IL-1ra) can attenuate heat-stroke formation.Both local cerebral blood flow and hypothalamic dopamine release during onset of heatstroke were assessed in saline-treated rats and in rats treated with an IL-1ra. Heat-stroke was induced by exposing the animals to a high ambient temperature. Hypothalamic dopamine release was determined by carbon fiber electrodes combined with in vivo differential pulse amperometry.During onset of heatstroke, rats with heatstroke displayed higher values of colonic temperature, higher values of hypothalamic dopamine release, and lower values of blood flow in different brain regions compared with normothermic control rats. In another separate experiment in which IL-1ra (200 micrograms/kg IV) was injected 30 minutes before onset of heatstroke, both the augmented hypothalamic dopamine release and diminished cerebral blood flow during onset of heatstroke were significantly attenuated. In addition, the survival time (interval between onset of heatstroke and death) of the rats with heatstroke was prolonged by pretreatment with IL-1ra.These results suggest that an increase in hypothalamic dopamine release and a decrease in local cerebral blood flow occur during onset of heatstroke. Pretreatment with IL-1ra attenuates the heatstroke formation resulting from cerebral ischemia by reducing hypothalamic dopamine release." @default.
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- W2000470437 title "Hypothalamic dopamine release and local cerebral blood flow during onset of heatstroke in rats." @default.
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- W2000470437 doi "https://doi.org/10.1161/01.str.25.12.2483" @default.
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