Inhibition of adult neurogenesis by inducible and targeted deletion of ERK5 mitogen-activated protein kinase specifically in adult neurogenic regions impairs contextual fear extinction and remote fear memory.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Yung-Wei PanZhengui Xia

Abstract

Although there is evidence suggesting that adult neurogenesis may contribute to hippocampus-dependent memory, signaling mechanisms responsible for adult hippocampal neurogenesis are not well characterized. Here we report that ERK5 mitogen-activated protein kinase is specifically expressed in the neurogenic regions of the adult mouse brain. The inducible and conditional knock-out (icKO) of erk5 specifically in neural progenitors of the adult mouse brain attenuated adult hippocampal neurogenesis. It also caused deficits in several forms of hippocampus-dependent memory, including contextual fear conditioning generated by a weak footshock. The ERK5 icKO mice were also deficient in contextual fear extinction and reversal of Morris water maze spatial learning and memory, suggesting that adult neurogenesis plays an important role in hippocampus-dependent learning flexibility. Furthermore, our data suggest a critical role for ERK5-mediated adult neurogenesis in pattern separation, a form of dentate gyrus-dependent spatial learning and memory. Moreover, ERK5 icKO mice have no memory 21 d after training in the passive avoidance test, suggesting a pivotal role for adult hippocampal neurogenesis in the expression of remote memory. Together...Continue Reading

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