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Del Carmen Gómez-Roldán, María; Pérez-Martín, Margarita; Capilla-González, Vivian; Cifuentes, Manuel; Pérez, Juan; García-Verdugo, Jose Manuel; Fernández-Llebrez, Pedro
Journal of comparative neurology (1911), 1 April 2008, Letnik: 507, Številka: 4Journal Article
The subventricular zone of the striatal wall of adult rodents is an active neurogenic region for life. Cubic multiciliated ependyma separates the subventricular zone from the cerebrospinal fluid (CSF) and is involved in the control of adult neurogenesis. By injecting neuraminidase from Clostridium perfringens into the right lateral ventricle of the rat, we provoked a partial detachment of the ependyma in the striatal wall. The contralateral ventricle was never affected and was used as the experimental control. Neuraminidase caused widening of the intercellular spaces among some ependymal cells and their subsequent detachment and disintegration in the CSF. Partial ependymal denudation was followed by infiltration of the CSF with macrophages and neutrophils from the local choroid plexus, which ependymal cells never detached after neuraminidase administration. Inflammation extended toward the periventricular parenchyma. The ependymal cells that did not detach and remained in the ventricle wall never proliferated. The lost ependyma was never recovered, and ependymal cells never behaved as neural stem cells. Instead, a scar formed by overlapping astrocytic processes sealed those regions devoid of ependyma. Some ependymal cells at the border of the denudated areas lost contact with the ventricle and became located under the glial layer. Concomitantly with scar formation, some subependymal cells protruded toward the ventricle through the ependymal breaks, proliferated, and formed clusters of rounded ventricular cells that expressed the phenotype of neuroblasts. Ventricular clusters of neuroblasts remained in the ventricle up to 90 days after injection. In the subventricular zone, adult neurogenesis persisted. J. Comp. Neurol. 507:1571–1587, 2008. © 2008 Wiley‐Liss, Inc.
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