Vascular adventitia generates neuronal progenitors in the monkey hippocampus after ischemia

Hippocampus
Tetsumori YamashimaHideyuki Okano

Abstract

In the adult hippocampus, neurogenesis proceeds in the subgranular zone (SGZ) of the dentate gyrus (DG), but not in the cornu Ammonis (CA). Recently, we demonstrated in monkeys that transient brain ischemia induces an increase of the neuronal progenitor cells in the SGZ, but not in CA1, in the second week after the insult. To identify the origin of primary neuronal progenitors in vivo, we compared the postischemic monkey DG and CA1, using light and electron microscopy, focusing on specific phenotype markers, as well as the expression of neurotrophic factors. Laser confocal microscopy showed that 1-3% of 5-bromo-2'-deoxyuridine (BrdU)-positive cells in the SGZ after 2-96 h labeling were also positive for neuronal markers such as TUC4, betaIII tubulin, and NeuN on days 9 and 15. In contrast, despite the presence of numerous BrdU-positive cells, CA1 showed no neurogenesis at any time points, and all the progenitors were positive for glial markers: Iba1 or S-100beta on days 4, 9, and 15. Highly polysialylated neural cell adhesion molecule (PSA-NCAM)-positive cells were abundant in the SGZ, but were absent in CA1. On day 9, most of the immature neurons positive for betaIII-tubulin in SGZ showed an increase in PSA-NCAM immunoreactivi...Continue Reading

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