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Increased cell proliferation and neurogenesis in the hippocampal dentate gyrus of old GFAP(-/-)Vim(-/-) mice

Journal article
Authors Åsa Larsson
Ulrika Wilhelmsson
Marcela Pekna
Milos Pekny
Published in Neurochem Res
Volume 29
Issue 11
Pages 2069-73
ISSN 0364-3190 (Print)
Publication year 2004
Published at Institute of Medical Biochemistry
Pages 2069-73
Language en
Links dx.doi.org/10.1007/s11064-004-6880-...
Keywords Aging/*physiology, Animals, Antimetabolites/diagnostic use, Bromodeoxyuridine/diagnostic use, Cell Proliferation, Dentate Gyrus/*cytology/*growth & development, Female, Glial Fibrillary Acidic Protein/*genetics/*physiology, Immunohistochemistry, Mice, Mice, Inbred C57BL, Mice, Knockout, Microscopy, Confocal, Neurons/physiology, Vimentin/*genetics/*physiology
Subject categories Neurobiology

Abstract

In response to central nervous system (CNS) injury, and more discretely so also during aging, astrocytes become reactive and increase their expression of the intermediate filament proteins glial fibrillary acidic protein (GFAP) and vimentin. Studies of mice deficient in astrocytic intermediate filaments have provided insights into the function of reactive gliosis. Recently we demonstrated robust integration of retinal transplants (1) and increased posttraumatic synaptic regeneration (2) in GFAP(-/-)Vim(-/-) mice, suggesting that modulation of astrocyte activity affects the permissiveness of the CNS environment for regeneration. Neurogenesis in the adult mammalian CNS is restricted to essentially two regions, the hippocampus and the subventricular zone. Here, we assessed neurogenesis in the hippocampus of 18-month-old GFAP(-/-)Vim(-/-) mice. In the granular layer of the dentate gyrus, cell proliferation/survival was 34% higher and neurogenesis 36% higher in GFAP(-/-)Vim(-/-) mice than in wildtype controls. These findings suggest that the adult hippocampal neurogenesis in healthy old mice can be increased by modulating astrocyte reactivity.

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