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GABA regulates dendritic growth by stabilizing lamellipodia in newly generated interneurons of the olfactory bulb

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Published in The Journal of Neuroscience. 2006, vol. 26, no. 50, p. 12956-12966
Abstract The initial formation and growth of dendrites is a critical step leading to the integration of newly generated neurons into postnatal functional networks. However, the cellular mechanisms and extracellular signals regulating this process remain mostly unknown. By directly observing newborn neurons derived from the subventricular zone in culture as well as in olfactory bulb slices, we show that ambient GABA acting through GABA(A) receptors is essential for the temporal stability of lamellipodial protrusions in dendritic growth cones but did not interfere with filopodia dynamics. Furthermore, we provide direct evidence that ambient GABA is required for the proper initiation and elongation of dendrites by promoting the rapid stabilization of new dendritic segments after their extension. The effects of GABA on the initial formation of dendrites depend on depolarization and Ca2+ influx and are associated with a higher stability of microtubules. Together, our results indicate that ambient GABA is a key regulator of dendritic initiation in postnatally generated olfactory interneurons and offer a mechanism by which this neurotransmitter drives early dendritic growth.
Keywords AnimalsAnimals, NewbornCells, CulturedDendrites/ physiologyGrowth Cones/ physiologyInterneurons/ physiologyOlfactory Bulb/ growth & developmentPseudopodia/ physiologyRatsRats, Sprague-DawleyReceptors, GABA-A/agonists/physiologygamma-Aminobutyric Acid/ physiology
PMID: 17167085
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Other version: http://www.jneurosci.org/cgi/reprint/26/50/12956.pdf
Research group Progéniteurs neuronaux
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GASCON, Eduardo et al. GABA regulates dendritic growth by stabilizing lamellipodia in newly generated interneurons of the olfactory bulb. In: Journal of Neuroscience, 2006, vol. 26, n° 50, p. 12956-12966. doi: 10.1523/JNEUROSCI.4508-06.2006 https://archive-ouverte.unige.ch/unige:10281

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Deposited on : 2010-08-06

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