Presynaptic alpha2delta-3 is required for synaptic morphogenesis independent of its Ca2+-channel functions.
Presynaptic alpha2delta-3 is required for synaptic morphogenesis independent of its Ca2+-channel functions.
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DOI:
10.1038/nn.2417
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发表时间:
2009-11
影响因子:
25
通讯作者:
Schwarz TL
中科院分区:
文献类型:
--
作者:
Kurshan PT;Oztan A;Schwarz TL
Synaptogenesis involves the transformation of a growth cone into synaptic boutons specialized for transmitter release. In Drosophila embryos lacking the α2δ-3 subunit of presynaptic, voltage-dependent Ca2+ channels, we find that motor neuron terminals fail to develop synaptic boutons and cytoskeletal abnormalities arise, including the loss of ankyrin2. Nevertheless, functional presynaptic specializations are present and apposed to clusters of postsynaptic glutamate receptors. Heretofore, the α2δ-3 protein has been thought to function strictly as an auxiliary subunit of the Ca2+ channel, but the phenotype of α2δ-3 mutations cannot be explained by a channel defect: embryos lacking the pore-forming α1 subunit cacophony form boutons. The synaptogenic function of α2δ-3 requires only the α2 peptide, whose expression suffices to rescue bouton formation. Our results indicate that α2δ proteins have functions independent of their roles in the biophysics and localization of Ca2+ channels, and synaptic architecture depends on these novel functions.
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