Title: The α crystallin domain of small heat shock protein b8 (Hspb8) acts as survival and differentiation factor in adult hippocampal neurogenesis
Authors: Ramírez-Rodríguez, Gerardo
Babu, Harish
Klempin, Friederike
Krylyshkina, Olga
Baekelandt, Veerle
Gijsbers, Rik
Debyser, Zeger
Overall, Rupert W
Nicola, Zeina
Fabel, Klaus
Kempermann, Gerd # ×
Issue Date: Mar-2013
Publisher: The Society for Neuroscience
Series Title: Journal of Neuroscience vol:33 issue:13 pages:5785-5796
Abstract: Adult hippocampal neurogenesis is to a large degree controlled at the level of cell survival, and a number of potential mediators of this effect have been postulated. Here, we investigated the small heat shock protein Hspb8, which, because of its pleiotropic prosurvival effects in other systems, was considered a particularly promising candidate factor. Hspb8 is, for example, found in plaques of Alzheimer disease but exerts neuroprotective effects. We found that expression of Hspb8 increased during differentiation in vitro and was particularly associated with later stages (48-96 h) of differentiation. Gain-of-function and loss-of-function experiments supported the hypothesis that Hspb8 regulates cell survival of new neurons in vitro. In the dentate gyrus of adult mice in vivo, lentiviral overexpression of Hspb8 doubled the surviving cells and concomitantly promoted differentiation and net neurogenesis without affecting precursor cell proliferation. We also discovered that the truncated form of the crystallin domain of Hspb8 was sufficient to affect cell survival and neuronal differentiation in vitro and in vivo. Precursor cell experiments in vitro revealed that Hspb8 increases the phosphorylation of Akt and suggested that the prosurvival effect can be produced by a cell-autonomous mechanism. Analysis of hippocampal Hspb8 expression in mice of 69 strains of the recombinant inbred set BXD revealed that Hspb8 is a cis-acting gene whose expression was associated with clusters of transcript enriched in genes linked to growth factor signaling and apoptosis. Our results strongly suggest that Hspb8 and its α-crystallin domain might act as pleiotropic prosurvival factor in the adult hippocampus.
ISSN: 0270-6474
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Virology and Gene Therapy
× corresponding author
# (joint) last author

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