报告中国汉族人群首例VAMP2基因突变致伴有肌张力低下的神经发育障碍和自闭症特征伴或不伴运动过度病(neurodevelopmental disorder with hypotonia and autistic features with or without hyperkinetic movements,NEDHAHM),以期为临...报告中国汉族人群首例VAMP2基因突变致伴有肌张力低下的神经发育障碍和自闭症特征伴或不伴运动过度病(neurodevelopmental disorder with hypotonia and autistic features with or without hyperkinetic movements,NEDHAHM),以期为临床诊治提供借鉴。患儿为14岁女童,以精神行为异常起病,表现为少言少语,基因检测提示VAMP2基因的3号外显子c.166C>T(p.Arg56Ter)杂合突变。对国外同类报告中12例患者资料回顾后发现,该病多在婴幼儿时期发病,男性多于女性,临床预后不佳,4-氨基吡啶可能为此病潜在性治疗药物,可改善患者症状。展开更多
受到广泛关注的神经递质的释放是通过突触囊泡与突触前膜的融合完成的.通过对单个囊泡动力学的分析发现,在突触囊泡分泌过程中除了"完全融合"(full fusion)模式外,还存在着"部分融合即离开"(kiss and run)和"...受到广泛关注的神经递质的释放是通过突触囊泡与突触前膜的融合完成的.通过对单个囊泡动力学的分析发现,在突触囊泡分泌过程中除了"完全融合"(full fusion)模式外,还存在着"部分融合即离开"(kiss and run)和"部分融合且停留"(kiss and stay)两种融合模式.在神经元受到强烈刺激时,这两种分泌模式尤为重要.同时突触囊泡融合前的转运、锚定、激活过程在神经递质的释放和调节过程中起着很关键的作用.在高K+刺激下的PC12细胞中,我们运用全内反射荧光显微镜(total internal reflection fluorescence microscopy,TIRFM)技术,通过VAMP2-pHluorin和VAChT-TDimer2双色荧光成像的方法跟踪类突触小囊泡(synaptic vesicle-like microvesicles,SLMVs)的锚定和融合过程.结果表明,在高K+刺激的PC12细胞中,部分融合即离开这种分泌模式占主导地位,同时发现在高K+刺激下SLMVs在细胞膜上的停留时间增加了,说明被激活囊泡的囊泡数量增加.展开更多
Neurotransmitters are released by the fusion of synaptic vesicles with presynaptic membrane,which has been extensively studied. The analysis of single vesicle fusion kinetics reveals that there exist fusion modes of &...Neurotransmitters are released by the fusion of synaptic vesicles with presynaptic membrane,which has been extensively studied. The analysis of single vesicle fusion kinetics reveals that there exist fusion modes of "kiss and run" and "kiss and stay" which may be favored by neurons especially during strong firing beside full fusion. Pre-fusion steps of translocation,docking and priming along the exo-cytotic pathway play important roles in neurotransmitter release and its regulation. In the present report,we used dual-color imaging of VAMP2-pHluorin and VAChT-TDimer2 under total internal reflection fluorescence microscope(TIRFM) to monitor the docking and fusion of synaptic-like microvesicles(SLMVs) in PC12 cells stimulated by high K+. Our results show that "kiss and run" is a dominative fu-sion mode in PC12 cells under high K+-challenge,and the dwell time of SLMVs is prolonged by the high K+ stimulation that suggests an enhancement of vesicle priming.展开更多
文摘报告中国汉族人群首例VAMP2基因突变致伴有肌张力低下的神经发育障碍和自闭症特征伴或不伴运动过度病(neurodevelopmental disorder with hypotonia and autistic features with or without hyperkinetic movements,NEDHAHM),以期为临床诊治提供借鉴。患儿为14岁女童,以精神行为异常起病,表现为少言少语,基因检测提示VAMP2基因的3号外显子c.166C>T(p.Arg56Ter)杂合突变。对国外同类报告中12例患者资料回顾后发现,该病多在婴幼儿时期发病,男性多于女性,临床预后不佳,4-氨基吡啶可能为此病潜在性治疗药物,可改善患者症状。
基金Supported by the National Natural Science Foundation of China (Grant Nos. 30670502 and 30470646) the Major State Basic Research Program of China (Grant No. 2006CB503908)
文摘Neurotransmitters are released by the fusion of synaptic vesicles with presynaptic membrane,which has been extensively studied. The analysis of single vesicle fusion kinetics reveals that there exist fusion modes of "kiss and run" and "kiss and stay" which may be favored by neurons especially during strong firing beside full fusion. Pre-fusion steps of translocation,docking and priming along the exo-cytotic pathway play important roles in neurotransmitter release and its regulation. In the present report,we used dual-color imaging of VAMP2-pHluorin and VAChT-TDimer2 under total internal reflection fluorescence microscope(TIRFM) to monitor the docking and fusion of synaptic-like microvesicles(SLMVs) in PC12 cells stimulated by high K+. Our results show that "kiss and run" is a dominative fu-sion mode in PC12 cells under high K+-challenge,and the dwell time of SLMVs is prolonged by the high K+ stimulation that suggests an enhancement of vesicle priming.
