Abstract
The activities of the central and peripheral immune systems impact neurological outcome after ischemic stroke. However, studies investigating the temporal profile of leukocyte infiltration, especially T-cell recruitment, are sparse. Our aim was to investigate leukocyte infiltration at different time points after experimental stroke in mice. Permanent middle cerebral artery occlusion was performed on 11 weeks old C57BL/6J mice, allowed to survive for 1, 3, 8, 14 or 28 days. In addition to infarct size measurements, detailed immunohistochemical analyses of T-cell and macrophage influx were performed. A recently introduced F-19 MR probe (V-sense), designed to track macrophages, was furthermore tested. Fourteen and 28 days after permanent middle cerebral artery occlusion a significant increase in CD3+ T-cells was found within the ipsilateral hemisphere compared to controls, especially within the infarct core and the corpus callosum. The number of CD68+ cells within the infarct core was significantly increased at days 8, 14 and 28. This temporal pattern was also seen in MRI. After experimental stroke within the infarcted cortex we found a delayed (day 14) infiltration of T-cells and macrophages. Furthermore, our data show that T-cel...Continue Reading
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