RT Journal Article
T1 Post-ischemic estradiol treatment reduced glial response and triggers distinct cortical and hippocampal signaling in a rat model of cerebral ischemia
A1 Pérez Álvarez, María José
A1 Maza, María del Carmen
A1 Antón, Marta
A1 Ordóñez Gutiérrez, Lara
A1 Wandosell, Francisco
AB Estradiol has been shown to exert neuroprotective effects in several neurodegenerative conditions, including cerebral ischemia. The presence of this hormone prior to ischemia attenuates the damage associated with such events in a rodent model (middle cerebral artery occlusion (MCAO)), although its therapeutic value when administered post-ischemia has not been assessed. Hence, we evaluated the effects of estradiol treatment after permanent MCAO (pMCAO) was induced in rats, studying the PI3K/AKT/GSK3/β-catenin survival pathway and the activation of SAPK-JNK in two brain areas differently affected by pMCAO: the cortex and hippocampus. In addition, we analyzed the effect of estradiol on the glial response to injury.Results: The increases in the percentage of GFAP- (5.25-fold) and Iba1- (1.8-fold) labeled cells in the cortex and hippocampus indicate that pMCAO induced ‘reactive gliosis’. This effect was prevented by post-ischemic estradiol treatment; diminished the number of these cells to those comparable with control animals. pMCAO down-regulated the PI3K/AkT/GSK3/β-catenin survival pathway to different extents in the cortex and hippocampus, the activity of which was restored by estradiol treatment more efficiently in the cerebral cortex (the most affected region) than in the hippocampus. No changes in the phosphorylation of SAPK-JNK were observed 54 h after inducing pMCAO, whereas pMCAO did significantly decrease the phospho-Akt Ser473 in neurons, an effect that was reversed by estradiol.Conclusion: The present study demonstrates that post-pMCAO estradiol treatment attenuates ischemic injury in both neurons and glia, events in which the PI3K/AKT/GSK3/β-catenin pathway is at least partly involved. These findings indicate that estradiol is a potentially useful treatment to enhance recovery after human ischemic stroke.          </jats:sec>
PB BioMed Central
SN 1742-2094
YR 2012
FD 2012-07-02
LK https://hdl.handle.net/20.500.14352/95366
UL https://hdl.handle.net/20.500.14352/95366
LA eng
NO Pérez-Álvarez MJ, Maza Mdel C, Anton M, Ordoñez L, Wandosell F. Post-ischemic estradiol treatment reduced glial response and triggers distinct cortical and hippocampal signaling in a rat model of cerebral ischemia. J Neuroinflammation. 2012 Jul 2;9:157. doi: 10.1186/1742-2094-9-157. PMID: 22747981; PMCID: PMC3414748.
NO CIBERNED
NO Plan Nacional DGCYT
NO UAM-Banco Santander
NO Fundación Areces
DS Docta Complutense
RD 19 ene 2026