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• W2040957577 abstract "Tumor necrosis factor-alpha (TNF-alpha) is a cytokine with diverse proinflammatory actions, including endothelial leukocyte adhesion molecule expression. Since leukocytes infiltrate into ischemic brain lesions, the present study was conducted to examine whether TNF-alpha messenger RNA (mRNA) and peptide are expressed in the brain after experimental focal stroke and before leukocyte accumulation.TNF-alpha mRNA and protein expression were monitored in the ischemic and nonischemic cerebral cortex of rats after focal ischemia produced by permanent middle cerebral artery occlusion. The effect of TNF-alpha administered by microinjection into the brain cortex on leukocyte adherence to brain capillaries was also studied.Induction of TNF-alpha mRNA, normalized to a standard reference rat macrophage TNF-alpha mRNA, was detected as early as 1 hour after middle cerebral artery occlusion. TNF-alpha mRNA was elevated by 3 hours (29 +/- 6% versus 2 +/- 1% in sham-operated rats) only in the ischemic cortex, with peak expression at 12 hours (104 +/- 8%; P < .01). Five days after middle cerebral artery occlusion, TNF-alpha mRNA levels in ischemic cortex were still significantly elevated (38 +/- 5%; P < .05). Also, TNF-alpha mRNA expression was greater in the ischemic cortex of spontaneously hypertensive rats than in normotensive rats (P < .05). Double-labeling, immunohistochemical studies revealed the presence of TNF-alpha protein localized within nerve fibers in the evolving infarct at 6 and 12 hours after ischemia and further expression in the tissues immediately adjacent to the infarct 24 hours after ischemia. After 5 days, the neuronally localized peptide had diminished greatly, but macrophages located within the infarcted tissues were immunoreactive. Cortical microinjections of TNF-alpha (10 ng in 1 microL) produced a significant neutrophil adherence/accumulation in capillaries and small blood vessels 24 hours later.These results represent the first demonstration that focal cerebral ischemia in rats results in elevated TNF-alpha mRNA and protein in ischemic neurons. The neuronal expression of peptide appears to facilitate the infiltration of inflammatory cells that can further exacerbate tissue damage in cerebral ischemia and might contribute to increased sensitivity and risk in focal stroke." @default.
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• W2040957577 date "1994-07-01" @default.
• W2040957577 modified "2023-10-11" @default.
• W2040957577 title "Tumor necrosis factor-alpha expression in ischemic neurons." @default.
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• W2040957577 doi "https://doi.org/10.1161/01.str.25.7.1481" @default.
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