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• W2003995841 startingPage "e49367" @default.
• W2003995841 abstract "Radiation therapy of the CNS, even at low doses, can lead to deficits in neurocognitive functions. Reduction in hippocampal neurogenesis is usually, but not always, associated with cognitive deficits resulting from radiation therapy. Generation of reactive oxygen species is considered the main cause of radiation-induced tissue injuries, and elevated levels of oxidative stress persist long after the initial cranial irradiation. Consequently, mutant mice with reduced levels of the mitochondrial antioxidant enzyme, Mn superoxide dismutase (MnSOD or Sod2), are expected to be more sensitive to radiation-induced changes in hippocampal neurogenesis and the related functions. In this study, we showed that MnSOD deficiency led to reduced generation of immature neurons in Sod2-/+ mice even though progenitor cell proliferation was not affected. Compared to irradiated Sod2+/+ mice, which showed cognitive defects and reduced differentiation of newborn cells towards the neuronal lineage, irradiated Sod2-/+ mice showed normal hippocampal-dependent cognitive functions and normal differentiation pattern for newborn neurons and astroglia. However, we also observed a disproportional decrease in newborn neurons in irradiated Sod2-/+ following behavioral studies, suggesting that MnSOD deficiency may render newborn neurons more sensitive to stress from behavioral trainings following cranial irradiation. A positive correlation between normal cognitive functions and normal dendritic spine densities in dentate granule cells was observed. The data suggest that maintenance of synaptic connections, via maintenance of dendritic spines, may be important for normal cognitive functions following cranial irradiation." @default.
• W2003995841 created "2016-06-24" @default.
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• W2003995841 date "2012-11-08" @default.
• W2003995841 modified "2023-10-15" @default.
• W2003995841 title "Paradoxical Relationship between Mn Superoxide Dismutase Deficiency and Radiation-Induced Cognitive Defects" @default.
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• W2003995841 doi "https://doi.org/10.1371/journal.pone.0049367" @default.
• W2003995841 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3493523" @default.
• W2003995841 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23145165" @default.
• W2003995841 hasPublicationYear "2012" @default.
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