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• W1974916613 abstract "Accumulation of neutrophils in brain after transient focal stroke remains controversial with some studies showing neutrophils to be deleterious, whereas others suggest neutrophils do not contribute to ischemic injury. Myeloperoxidase (MPO) has been used extensively as a marker for quantifying neutrophil accumulation, but is an indirect method and does not detect neutrophils alone. To elucidate the interaction of macrophages in the neutrophil inflammatory response, we conducted double-label immunofluorescence in brain sections at 0, 1, 2, 3, 7, and 15 days after ischemia. Each of these results was obtained from the same animal to determine correlations between neutrophil infiltration and ischemic damage. It was found that MPO activity increased up to 3 days after cerebral ischemia. Dual-staining revealed that macrophages engulf neutrophils in the brain and that this engulfment of neutrophils increased with time, with 50% of neutrophils in the brain engulfed at 3 days and approximately 85% at 15 days (N=5, P<0.05). Interestingly, at 7 days the amount of dual-staining was decreased to 20% (N=5, P<0.05). Neutrophil infiltration was positively correlated with ischemic damage in both the cortex and striatum (r(2)=0.86 and 0.80, respectively, P<0.01). The results of this study indicate that the MPO from neutrophils phagocytized by macrophages may continue to contribute to the overall MPO activity, and that previous assessments that have utilized this marker to measure neutrophil accumulation may have mis-calculated the number of neutrophils within the ischemic territory and hence their contribution to the evolution of the infarct at later time points. Thus any biphasic infiltration of neutrophils may have been masked by the accumulation of macrophages." @default.
• W1974916613 created "2016-06-24" @default.
• W1974916613 creator A5017545603 @default.
• W1974916613 creator A5020283677 @default.
• W1974916613 creator A5045747721 @default.
• W1974916613 creator A5057593342 @default.
• W1974916613 date "2006-05-31" @default.
• W1974916613 modified "2023-09-24" @default.
• W1974916613 title "Inflammatory Cell Infiltration after Endothelin-1-Induced Cerebral Ischemia: Histochemical and Myeloperoxidase Correlation with Temporal Changes in Brain Injury" @default.
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