Inositol-1,4,5-trisphosphate-3-kinase-A controls morphology of hippocampal dendritic spines
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Inositol-1,4,5-trisphosphate-3-kinase-A controls morphology of hippocampal dendritic spines. / Köster, Jan-Dietrich; Leggewie, Birthe; Blechner, Christine; Brandt, Nicola; Fester, Lars; Rune, Gabriele; Schweizer, Michaela; Kindler, Stefan; Windhorst, Sabine.
in: CELL SIGNAL, Jahrgang 28, Nr. 1, 01.2016, S. 83-90.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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T1 - Inositol-1,4,5-trisphosphate-3-kinase-A controls morphology of hippocampal dendritic spines
AU - Köster, Jan-Dietrich
AU - Leggewie, Birthe
AU - Blechner, Christine
AU - Brandt, Nicola
AU - Fester, Lars
AU - Rune, Gabriele
AU - Schweizer, Michaela
AU - Kindler, Stefan
AU - Windhorst, Sabine
N1 - Copyright © 2015 Elsevier Inc. All rights reserved.
PY - 2016/1
Y1 - 2016/1
N2 - Long-lasting synaptic plasticity is often accompanied by morphological changes as well as formation and/or loss of dendritic spines. Since the spine cytoskeleton mainly consists of actin filaments, morphological changes are primarily controlled by actin binding proteins (ABPs). Inositol-1,4,5-trisphosphate-3-kinase-A (ITPKA) is a neuron-specific, actin bundling protein concentrated at dendritic spines. Here, we demonstrate that ITPKA depletion in mice increases the number of hippocampal spine-synapses while reducing average spine length. By employing actin to ABP ratios similar to those occurring at post synaptic densities, in addition to cross-linking actin filaments, ITPKA strongly inhibits Arp2/3-complex induced actin filament branching by displacing the complex from F-actin. In summary, our data show that in vivo ITPKA negatively regulates formation and/or maintenance of synaptic contacts in the mammalian brain. On the molecular level this effect appears to result from the ITPKA-mediated inhibition of Arp2/3-complex F-actin branching activity.
AB - Long-lasting synaptic plasticity is often accompanied by morphological changes as well as formation and/or loss of dendritic spines. Since the spine cytoskeleton mainly consists of actin filaments, morphological changes are primarily controlled by actin binding proteins (ABPs). Inositol-1,4,5-trisphosphate-3-kinase-A (ITPKA) is a neuron-specific, actin bundling protein concentrated at dendritic spines. Here, we demonstrate that ITPKA depletion in mice increases the number of hippocampal spine-synapses while reducing average spine length. By employing actin to ABP ratios similar to those occurring at post synaptic densities, in addition to cross-linking actin filaments, ITPKA strongly inhibits Arp2/3-complex induced actin filament branching by displacing the complex from F-actin. In summary, our data show that in vivo ITPKA negatively regulates formation and/or maintenance of synaptic contacts in the mammalian brain. On the molecular level this effect appears to result from the ITPKA-mediated inhibition of Arp2/3-complex F-actin branching activity.
U2 - 10.1016/j.cellsig.2015.10.016
DO - 10.1016/j.cellsig.2015.10.016
M3 - SCORING: Journal article
C2 - 26519023
VL - 28
SP - 83
EP - 90
JO - CELL SIGNAL
JF - CELL SIGNAL
SN - 0898-6568
IS - 1
ER -