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首页> 外文期刊>Neuron >Synaptic vesicle mobilization is regulated by distinct synapsin I phosphorylation pathways at different frequencies.
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Synaptic vesicle mobilization is regulated by distinct synapsin I phosphorylation pathways at different frequencies.

机译:突触小泡的动员受到不同频率下不同的突触素I磷酸化途径的调节。

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During action potential firing, the rate of synapsin dissociation from synaptic vesicles and dispersion into axons controls the rate of vesicle availability for exocytosis at the plasma membrane. Here we show that synapsin Ia's dispersion rate tracks the synaptic vesicle pool turnover rate linearly over the range 5-20 Hz and that the molecular basis for this lies in regulation at both the calcium-calmodulin-dependent kinase (CaM kinase) and the mitogen-activated protein (MAP) kinase/calcineurin sites. Our results show that CaM kinase sites control vesicle mobilization at low stimulus frequency, while MAP kinase/calcineurin sites are critical at both lower and higher stimulus frequencies. Thus, multiple signaling pathways serve to allow synapsin's control of vesicle mobilization over different stimulus frequencies.
机译:在动作电位射击期间,突触素从突触小泡解离和分散成轴突的速率控制了质膜上胞吐作用的小泡可用性的速率。在这里,我们显示突触素Ia的分散速率在5-20 Hz范围内线性跟踪突触囊泡周转速率,并且其分子基础在于钙钙调蛋白依赖性激酶(CaM激酶)和促分裂原-活化蛋白(MAP)激酶/钙调神经磷酸酶位点。我们的结果表明,CaM激酶位点在低刺激频率下控制囊泡动员,而MAP激酶/钙调神经磷酸酶位点在较低和较高刺激频率下都至关重要。因此,多种信号传导途径用于允许突触蛋白控制不同刺激频率上的囊泡动员。

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