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Spreading depression and focal venous cerebral ischemia enhance cortical neurogenesis
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Spreading depression and focal venous cerebral ischemia enhance cortical neurogenesis
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Journal Article
Spreading depression and focal venous cerebral ischemia enhance cortical neurogenesis
2017
Overview
Endogenous neurogenesis can arise from a variety of physiological stimuli including exercise, learning, or ＂enriched environment＂ as well as pathological conditions such as ischemia, epilepsy or cortical spreading depression. Whether all these conditions use a common trigger to set off endogenous neurogenesis is yet unclear. We hypothesized that cortical spreading depression（CSD） induces neurogenesis in the cerebral cortex and dentate gyrus after cerebral venous ischemia. Forty-two Wistar rats alternatively underwent sham operation（Sham）, induction of ten CSDs or venous ischemia provoked via occlusion of two adjacent superficial cortical vein followed by ten induced CSDs（CSD ＋ 2-VO）. As an additional control, 15 na？ve rats received no intervention except 5-bromo-2′-deoxyuridine（Brd U） treatment for 7 days. Sagittal brain slices（40 μm thick） were co-stained for Brd U and doublecortin（DCX; new immature neuronal cells） on day 9 or Neu N（new mature neuronal cells） on day 28. On day 9 after sham operation, cell proliferation and neurogenesis occurred in the cortex in rats. The sole induction of CSD had no effect. But on days 9 and 28, more proliferating cells and newly formed neurons in the ipsilateral cortex were observed in rats subjected to CSD ＋ 2VO than in rats subjected to sham operation. On days 9 and 28, cell proliferation and neurogenesis in the ipsilateral dentate gyrus was increased in sham-operated rats than in na？ve rats. Our data supports the hypothesis that induced cortical neurogenesis after CSD ＋ 2-VO is a direct effect of ischemia, rather than of CSD alone.
Publisher
Medknow Publications and Media Pvt. Ltd,Medknow Publications & Media Pvt. Ltd,Department of Neurosurgery, Nara Medical University, Nara, Japan%University Medical Center of the Johannes Gutenberg-University of Mainz, Institute for Neurosurgical Pathophysiology, Mainz, Germany,Medknow Publications & Media Pvt Ltd,Wolters Kluwer Medknow Publications
