Selective noradrenaline depletion impairs working memory and hippocampal neurogenesis.
Neurobiol Aging
; 48: 93-102, 2016 12.
Article
en En
| MEDLINE
| ID: mdl-27644078
ABSTRACT
Noradrenergic neurons in the locus coeruleus play a role in learning and memory, and their loss is an early event in Alzheimer's disease pathogenesis. Moreover, noradrenaline may sustain hippocampal neurogenesis; however, whether are these events related is still unknown. Four to five weeks following the selective immunotoxic ablation of locus coeruleus neurons, young adult rats underwent reference and working memory tests, followed by postmortem quantitative morphological analyses to assess the extent of the lesion, as well as the effects on proliferation and/or survival of neural progenitors in the hippocampus. When tested in the Water Maze task, lesioned animals exhibited no reference memory deficit, whereas working memory abilities were seen significantly impaired, as compared with intact or sham-lesioned controls. Stereological analyses confirmed a dramatic noradrenergic neuron loss associated to reduced proliferation, but not survival or differentiation, of 5-bromo-2'deoxyuridine-positive progenitors in the dentate gyrus. Thus, ascending noradrenergic afferents may be involved in more complex aspects of cognitive performance (i.e., working memory) possibly via newly generated progenitors in the hippocampus.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Norepinefrina
/
Neurogénesis
/
Neuronas Adrenérgicas
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Hipocampo
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Memoria
/
Trastornos de la Memoria
Tipo de estudio:
Etiology_studies
Límite:
Animals
Idioma:
En
Revista:
Neurobiol Aging
Año:
2016
Tipo del documento:
Article
País de afiliación:
Italia