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Neuroscience. 2008 Jun 2;153(4):929-34. doi: 10.1016/j.neuroscience.2008.03.015. Epub 2008 Mar 20.

Decreased memory for novel object recognition in chronically food-restricted mice is reversed by acute ghrelin administration.

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Departamento de Farmacología, Facultad de Ciencias Químicas, Haya de la Torre y Medina Allende, Universidad Nacional de Córdoba, Ciudad Universitaria, 5016 Córdoba, Argentina.


It has been demonstrated, in normal and aged rats and mice, that acute i.c.v. ghrelin (Ghr) administration increases memory retention. In order to evaluate if this treatment, restores memory retention in animals exhibiting impaired memory, in the present work we selected a chronic food restriction mouse model (since undernutrition prejudices higher nervous functions). We employed adult female mice with 28 days of 50% food restriction and evaluated: a) behavioral performance using novel object recognition test for memory, and plus maze for anxiety-like behavior, b) some morphometric parameters as body and hepatic weights and c) plasma Ghr levels. The animals with 50% food restriction showed an increase in plasma Ghr levels and a decrease in morphometric parameters and in the percentage of novel object recognition time. When the peptide was i.c.v. injected in food-restricted animals (0.03, 0.3 or 3.0 nmol/microl), memory increases in relation to food-restricted mice injected with vehicle, reaching a performance similar to controls.

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