Loss of the Synaptic Vesicle Protein SV2B results in reduced neurotransmission and altered synaptic vesicle protein expression in the retina.

Loss of the Synaptic Vesicle Protein SV2B results in reduced neurotransmission and altered synaptic vesicle protein expression in the retina.
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DOI:
10.1371/journal.pone.0005230
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Bajjalieh SM
Bajjalieh SM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Morgans CW;Kensel-Hammes P;Hurley JB;Burton K;Idzerda R;McKnight GS;Bajjalieh SM

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突触小泡蛋白 2 (SV2) 转运蛋白家族仅在进行钙调节胞吐作用的囊泡中表达。在哺乳动物中表达的三种亚型中,SV2B 是差异最大的。在这里,我们报告了 SV2B 在视网膜中的位置和功能的研究。免疫标记研究表明,SV2B 在视杆光感受器突触末端中检测到,它是主要亚型。在缺乏 SV2B 的小鼠中,光感受器和双极神经元之间突触的突触传递减少,视网膜电图记录中 b 波幅度的显着降低证明了这一点。全眼的定量免疫印迹分析表明,SV2B 的缺失与突触小泡蛋白水平降低相关,包括突触结合蛋白、VAMP、突触素和囊泡谷氨酸转运蛋白 V-GLUT1。免疫标记研究表明,SV2B 在视杆光感受器突触末端中检测到,它是主要亚型。因此,SV2B 有助于调节突触小泡胞吐作用,并在调节突触蛋白含量中发挥重要作用。
The Synaptic Vesicle Protein 2 (SV2) family of transporter-like proteins is expressed exclusively in vesicles that undergo calcium-regulated exocytosis. Of the three isoforms expressed in mammals, SV2B is the most divergent. Here we report studies of SV2B location and function in the retina. Immunolabeling studies revealed that SV2B is detected in rod photoreceptor synaptic terminals where it is the primary isoform. In mice lacking SV2B, synaptic transmission at the synapse between photoreceptors and bipolar neurons was decreased, as evidenced by a significant reduction in the amplitude of the b-wave in electroretinogram recordings. Quantitative immunoblot analyses of whole eyes revealed that loss of SV2B was associated with reduced levels of synaptic vesicle proteins including synaptotagmin, VAMP, synaptophysin and the vesicular glutamate transporter V-GLUT1. Immunolabeling studies revealed that SV2B is detected in rod photoreceptor synaptic terminals where it is the primary isoform. Thus, SV2B contributes to the modulation of synaptic vesicle exocytosis and plays a significant role in regulating synaptic protein content.
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