KINETICS OF AXONAL PROTEIN SYNTHESIS AND RNA TRANSPORT

这个子项目是利用资源的许多研究子项目之一。 由NIH/NCRR资助的中心拨款提供。对子项目的主要支持 子项目的首席调查员可能是由其他来源提供的， 包括美国国立卫生研究院的其他来源。为子项目列出的总成本可能 表示该子项目使用的中心基础设施的估计数量， 不是由NCRR赠款提供给次级项目或次级项目工作人员的直接资金。 该项目的目的是确定损伤后神经细胞的远端突起如何调节其蛋白质水平。这些“轴突”是大脑和脊髓进行远程通讯所必需的。如果这些过程被破坏，沟通就会停止，大脑和脊髓的功能就会丧失。促进受损轴突的再生将恢复大脑和脊柱的功能。一些证据表明，远端轴突可以通过调节局部蛋白质的合成和降解来自主调节再生所需的蛋白质水平。直到最近，我们还没有办法剖析再生轴突的蛋白质组，因为可供研究的材料非常有限，而且经常被其他细胞成分污染。我们将利用我们实验室开发的轴突制备和加州大学旧金山分校质谱仪的高灵敏度蛋白质组学应用来确定轴向合成蛋白质的前体是如何被定位为运输到轴突中的，以及这些前体编码的蛋白质产物会发生什么。我们将使用亲和纯化的信使核糖核酸：蛋白质复合体来鉴定将信使核糖核酸前体运输到轴突所需的蛋白质。将这些数据与我们实验室正在进行的轴突mRNA图谱分析相结合，将提供远端轴突蛋白质动力学的系统视图。最终，这些研究将为我们提供一个独特的轴突生物学视角，这到目前为止还不可行，应该会导致加速脑和脊髓创伤后再生的新策略。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. The objective of this project is to determine how the distal processes of nerve cells regulate their protein levels after injury. These 'axonal processes' are needed for long-range communication in the brain and spinal cord. If these processes are disrupted, communication ceases and function of the brain and spinal cord is lost. Improving regeneration of injured axonal processes will restore function to the brain and spinal column. Several lines of evidence indicate that distal axonal processes can autonomously regulate levels of proteins needed for regeneration through modulating synthesis and degradation of these proteins locally. Until recently we have had no means to dissect the proteome of regenerating axons, since the materials available for study are exceptionally limiting and most often contaminated with other cellular constituents. We will take advantage of an axonal preparation that our laboratory has developed and the high sensitivity proteomics applications of the UCSF Mass Spectrometry Facility to determine how the precursors of axonally synthesized proteins are targeted for transport into axons and what becomes of the protein products encoded by these precursors. We will use affinity purification of mRNA: protein complexes to identify the proteins needed for transport of the mRNA precursors into axons. Integrating these data with ongoing axonal mRNA profiling from our laboratory will provide a systematic view of protein dynamics of distal axons. Ultimately, these studies will provide us with a unique perspective of axonal biology that has not been feasible until now and should lead to novel strategies for accelerating regeneration after traumatic injury of the brain and spinal cord.