Leptin promotes rapid dynamic changes in hippocampal dendritic morphology

Dervla O'Malley, Neil MacDonald, Sarah Mizielinska, Christopher N. Connolly, Andrew J. Irving, Jenni Harvey

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    Abstract

    Recent studies have implicated the hormone leptin in synaptic plasticity associated with neuronal development and learning and memory. Indeed, leptin facilitates hippocampal long-term potentiation and leptin -insensitive rodents display impaired hippocampal synaptic plasticity suggesting a role for endogenous leptin. Structural changes are also thought to underlie activity-dependent synaptic plasticity and this may be regulated by specific growth factors. As leptin is reported to have neurotrophic actions, we have examined the effects of leptin on the morphology and filopodial outgrowth in hippocampal neurons. Here, we demonstrate that leptin rapidly enhances the motility and density of dendritic filopodia and subsequently increases the density of hippocampal synapses. This process is dependent on the synaptic activation of NR2A-containing NMDA receptors and is mediated by the MAPK (ERK) signaling pathway. As dendritic morphogenesis is associated with activity -dependent changes in synaptic strength, the rapid structural remodeling of dendrites by leptin has important implications for its role in regulating hippocampal synaptic plasticity and neuronal development. (c) 2007 Elsevier Inc. All rights reserved.

    Original languageEnglish
    Pages (from-to)559-572
    Number of pages14
    JournalMolecular and Cellular Neuroscience
    Volume35
    Issue number4
    DOIs
    Publication statusPublished - Aug 2007

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