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The stage of neurogenesis can be divided into three steps: proliferation, migration, and differentiation. To elucidate their detailed relations after ischemia, the three steps were comprehensively evaluated, in the subventricular zone (SVZ) through the rostral migratory stream (RMS) to the olfactory bulb (OB), in adult gerbil brain after 5 minutes of transient forebrain ischemia. Bromodeoxyuridine (BrdU), highly polysialylated neural cell adhesion molecule (PSA-NCAM), neuronal nuclear antigen (NeuN), and glial fibrillary acidic protein (GFAP) were used as markers for proliferation, migration, and differentiation, respectively. The number of BrdU-labeled cells that coexpressed PSA-NCAM and the size of PSA-NCAM-positive cell colony increased in the SVZ with a peak at 10 d after transient ischemia. In the RMS, the number of BrdU-labeled cells that coexpressed PSA-NCAM increased, with a delayed peak at 30 d, when the size of RMS itself became larger and the number of surrounding GFAP-positive cells increased. In the OB, BrdU + NeuN double positive cells were detected at 30 and 60 d. NeuN staining and terminal deoxynucleotidyl dUTP nick-end labeling staining showed no neuronal cell loss around the SVZ, and in the RMS and the OB after transient ischemia. These findings indicate that transient forebrain ischemia enhances neural stem cell proliferation in the SVZ without evident neuronal cell loss, and has potential neuronal precursor migration with activation of GFAP-positive cells through the RMS to the OB.

journal of cerebral blood flow and metabolism

Temporal Profile of Stem Cell Division, Migration, and Differentiation from Subventricular Zone to Olfactory Bulb after Transient Forebrain Ischemia in Gerbils