Elucidating the mechanism of action of novel ClpP activators in activation of the mitochondrial unfolded protein response.

阐明新型 ClpP 激活剂在激活线粒体未折叠蛋白反应中的作用机制。

基本信息

批准号：
10256779
负责人：
Lee M Graves
金额：
$ 31.44万
依托单位：
UNIV OF NORTH CAROLINA CHAPEL HILL
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-15 至 2024-06-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10256779
关键词：
Affect Aging Agonist Alzheimer&apos s Disease Antineoplastic Agents Applications Grants Ataxia Binding Biological Biological Process Breast Caenorhabditis elegans Cell Energetics Cell Line Cell Nucleus Cell physiology Cells Cellular Metabolic Process Cellular Stress Cellular biology Chemicals Citric Acid Cycle Clinical Trials Consumption Data Degenerative Disorder Disease Dose Endometrial Endoplasmic Reticulum Event Generations Genetic Genetic Translation Glioblastoma Glucose Glutamine Glycolysis Goals Growth Homeostasis Human Impairment Investigation Knock-out Link Lower Organism Malignant Neoplasms Mammalian Cell Measures Metabolic Metabolism Mitochondria Mitochondrial Matrix Mitochondrial Proteins Modification Molecular Nuclear Parkinson Disease Pathway interactions Peptide Hydrolases Peptides Pharmaceutical Preparations Phenotype Phosphorylation Phosphotransferases Play Polyribosomes Process Production Property Protein Biosynthesis Protein Synthesis Induction Protein Synthesis Inhibition Proteins Proteome Proteomics Regulation Research Respiratory Chain Ribosomal Proteins Role Scientist Signal Pathway Signal Transduction Stress Time VDAC1 gene Western Blotting Work analog anti-cancer arm biological adaptation to stress cell growth drug development drug mechanism experimental study insight interest leukemia metabolomics misfolded protein mitochondrial metabolism mutant neoplastic cell news novel novel therapeutics protein degradation proteostasis proteotoxicity response sensor small molecule stable isotope tool transcription factor CHOP

项目摘要

The mitochondrial Unfolded Protein Response (UPRMT) is a highly conserved stress pathway that when dysregulated is causally connected to a host of degenerative diseases including Parkinsons, Alzheimers, Freiderichs Ataxia and aging. The recent identification of components in the UPRMT has stimulated interest in this as a “druggable” pathway. Central to the UPRMT is the mitochondrial protease ClpP, required for the turnover of damaged and misfolded proteins in response to cellular stresses. We and others recently identified ClpP as an unexpected target for a novel class of anti-cancer compounds known as imipridones (ONC201) and related analogs (https://www.the-scientist.com/news-opinion/found--a-cancer-drugs-mechanism-of-action- 65918). We showed that these compounds activated ClpP and the UPRMT as determined by the degradation of mitochondrial proteins, impaired mitochondrial respiratory chain activity, and increased integrated stress response (ISR) proteins (CHOP/ATF4). Thus, the main objective of this research is to investigate the basic mechanisms of the UPRMT and elucidate how drug- induced activation of ClpP initiates important stress signals that regulate cell growth and metabolism. We propose three aims to accomplish this: in Aim 1 we will use comprehensive proteomics approaches to identify ClpP substrates and peptides released from the mitochondria. In Aim 2 we will determine how ClpP activation dysregulates mitochondrial metabolism, and affects the consumption of glucose and glutamine by glycolysis and the TCA cycle. In Aim 3 we will determine how ClpP activation alters cytosolic signaling events, namely the activation of the ISR and the resulting reduction in protein synthesis. If successful, our studies will provide significant new insight into the biological functions of the UPRMT and how ClpP regulates this pathway functions to modulate cell stress in normal and disease states.

线粒体展开的蛋白质反应（UPRMT）是一种高度保守的应力途径，当失调时，有时会连接到许多退化性疾病帕金森氏症，阿尔茨海默氏症，弗里德里奇共济失调和衰老。最新识别组件在UPRMT中，人们以“可药”途径激发了人们的兴趣。 UPRMT的中心是线粒体蛋白酶CLPP，在受损和错误折叠蛋白的周转所必需的线粒体蛋白酶CLPP中对细胞应激的反应。我们和其他人最近将CLPP视为意外的目标一类新型的抗癌化合物，称为丙捷酮（ONC201）和相关的类似物（https://www.the-scientist.com/news-opinion/found--a-cancer-drugs-mechanism-of-action- 65918）。我们表明这些化合物激活了CLPP和UPRMT，由线粒体蛋白的降解，线粒体呼吸链活性受损和增加的综合应力反应（ISR）蛋白（CHOP/ATF4）。那是这项研究是为了研究UPRMT的基本机制，并阐明了药物诱导的CLPP激活启动了调节细胞生长和的重要应力信号代谢。我们提出三个目标来实现这一目标：在AIM 1中，我们将使用全面蛋白质组学方法是鉴定从线粒体释放的CLPP底物和胡椒体的方法。在AIM 2中，我们将确定CLPP激活如何失调线粒体代谢，并且通过糖酵解和TCA周期影响葡萄糖和谷氨酰胺的消耗。在目标3中我们将确定CLPP激活如何改变胞质信号事件，即激活 ISR和蛋白质合成的减少。如果成功，我们的研究将提供对UPRMT的生物学功能的重大新见解以及如何调节这一点途径在正常状态和疾病状态下调节细胞应激的功能。