Activity-dependent IGF-1 exocytosis is controlled by the Ca(2+)-sensor synaptotagmin-10.
Activity-dependent IGF-1 exocytosis is controlled by the Ca(2+)-sensor synaptotagmin-10.
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DOI:
10.1016/j.cell.2011.03.034
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发表时间:
2011-04-15
期刊:
影响因子:
64.5
通讯作者:
Südhof TC
中科院分区:
文献类型:
--
作者:
Cao P;Maximov A;Südhof TC
Synaptotagmins Syt1, Syt2, Syt7, and Syt9 act as Ca2+-sensors for synaptic and neuroendocrine exocytosis, but the function of other synaptotagmins remains unknown. Here, we show that olfactory bulb neurons secrete IGF-1 by an activity-dependent pathway of exocytosis, and that Syt10 functions as the Ca2+-sensor that triggers IGF-1 exocytosis in these neurons. Deletion of Syt10 impaired activity-dependent IGF-1 secretion in olfactory bulb neurons, resulting in smaller neurons and an overall decrease in synapse numbers. Exogenous IGF-1 completely reversed the Syt10 knockout phenotype. Syt10 co-localized with IGF-1 in somatodendritic vesicles of olfactory bulb neurons, and Ca2+-binding to Syt10 caused these vesicles to undergo exocytosis, thereby secreting IGF-1. Thus, Syt10 controls a previously unrecognized pathway of Ca2+-dependent exocytosis that is spatially and temporally distinct from Ca2+-dependent synaptic vesicle exocytosis controlled by Syt1 in the same neurons, and two different synaptotagmins regulate distinct Ca2+-dependent membrane fusion reactions during exocytosis in the same neuron.
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影响因子:
64.5
作者:
GEPPERT, M;GODA, Y;SUDHOF, TC
通讯作者:
SUDHOF, TC
影响因子:
64.5
作者:
BAKER, J;LIU, JP;EFSTRATIADIS, A
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EFSTRATIADIS, A
影响因子:
4.8
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LI, C;DAVLETOV, BA;SUDHOF, TC
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SUDHOF, TC
影响因子:
64.5
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LIU, JP;BAKER, J;EFSTRATIADIS, A
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EFSTRATIADIS, A
影响因子:
64.8
作者:
Fernández-Chacón, R;Königstorfer, A;Südhof, TC
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Südhof, TC