Intracellular trafficking of AMPA receptors in synaptic plasticity

Modification of ligand-gated receptor function at the postsynaptic domain is one of the most important mechanisms by which the efficacy of synaptic transmission in the nervous system is regulated. Traditionally, these types of modifications have been thought to be achieved mainly by altering the channel-gating properties or conductance of the receptors. However, recent evidence suggests that AMPA (α-amino-3-hydroxyl-5-methyl-4-isoxayolepropionic acid)-type ligand-gated glutamate receptors are continuously recycling between the plasma membrane and the intracellular compartments via vesicle-mediated plasma membrane insertion and clathrin-dependent endocytosis. Regulation of either receptor insertion or endocytosis results in a rapid change in the number of these receptors expressed on the plasma membrane surface and in the receptor-mediated responses, thereby playing an important role in mediating certain forms of synaptic plasticity. Thus, controlling the number of postsynaptic receptors by regulating the intracellular trafficking and plasma membrane expression of the postsynaptic receptors may be a common and important mechanism of synaptic plasticity in the mammalian central nervous system.     

癫痫的发病机制研究进展

 癫痫是神经系统的常见疾病之一,其发病机制十分复杂,目前尚未完全阐明。近年来,关于癫痫发病机制的研究表明,癫痫的发生与离子通道、神经递质、突触连接、神经血管单元、神经胶质细胞等均存在密切联系。为深入理解癫痫发病机制,为诊断、预防与治疗癫痫提供必要的理论依据,本文从离子通道、神经突触传递与连接、神经血管单元完整性、神经胶质细胞4个方面对癫痫发生机制的研究进展做一综述。     

室温下水凝胶合成的新型方法及测试研究

旨在报道一种新型的水凝胶因子,可在室温下形成凝胶。通过向安替比林-环己烷羰基酯(物质1)的乙醇溶液中加入定量的水可原位、即刻形成凝胶,利用有机合成方法得到了含有吡唑啉酮和环己胺基团的凝胶因子,通过IR,XRD,SEM,TEM等手段对凝胶进行了表征。研究发现,在水含量较低时,凝胶因子分子聚集成为囊泡形状;随着含水量的增大,它的聚集体能实现由0D囊泡向不规整的2D片状结构的转变,并胶凝溶剂。