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• W2085487749 abstract "Blockade of central H(2) receptors aggravates ischemic neuronal damage. Since changes in the activity of the monoaminergic system are contributing factors in the development of ischemic neuronal damage, the authors evaluated the effects of ranitidine on the monoaminergic system and ischemic neuronal damage in the middle cerebral artery (MCA) occlusion model of rats. Wistar rats pretreated with saline or ranitidine (3 and 30 nmol, i.c.v.) were subjected to reversible occlusion of MCA for 2 h. The total infarct volume was determined 24 h after reperfusion. The relationship between dopaminergic activity and the histologic outcome was estimated by lesioning the substantia nigra 2 days before MCA occlusion. In a second experiment, the animals were subjected to 15 min of MCA occlusion, and the effects of ranitidine on the histologic outcome was evaluated 7 days after ischemia. In a third experiment, the tissue concentrations of monoamines and their metabolites were determined in the cerebral cortex and striatum 2 h after reperfusion following MCA occlusion for 2 h. The turnover of norepinephrine and dopamine was compared between animals treated with saline and those treated with ranitidine by estimating the alpha-methyl-p-tyrosine-induced depletion of norepinephrine and dopamine, respectively. The turnover of 5-hydroxytryptamine was evaluated by the probenecid-induced accumulation of 5-hydroxyindoleacetic acid. Treatments with ranitidine markedly increased the infarct volume 24 h after reperfusion. Ranitidine also aggravated delayed neuronal death 7 days after ischemia. The aggravation was abolished by the lesion of the substantia nigra before MCA occlusion. The MCA occlusion increased the turnover of cortical norepinephrine and striatal dopamine. The turnover was further facilitated by ranitidine. Although ranitidine suppressed the 5-hydroxytryptamine turnover in the cerebral cortex, the extent of this effect was similar in both the ischemic and non-ischemic sides. These results suggest that facilitation of the catecholaminergic systems is involved in the aggravation of ischemic neuronal damage by H(2) blockade." @default.
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• W2085487749 date "2003-06-01" @default.
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• W2085487749 title "Blockade of central histaminergic H2 receptors facilitates catecholaminergic metabolism and aggravates ischemic brain damage in the rat telencephalon" @default.
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• W2085487749 doi "https://doi.org/10.1016/s0006-8993(03)02558-7" @default.
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