Dissecting a post-translational modification code in cardiac reprogramming

剖析心脏重编程中的翻译后修饰代码

• 批准号: 10434240
• 负责人: Zhong Wang
• 金额: $ 46.55万
• 依托单位: UNIVERSITY OF MICHIGAN AT ANN ARBOR
• 依托单位国家: 美国
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-05-01 至 2026-04-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10434240
• 关键词: Acetylation; Animal Model; Automobile Driving; Binding; Cardiac; Cardiac Myocytes; Cell Differentiation process; Cell Fate Control; Cells; Chromatin; Code; Development; Enzymes; Epigenetic Process; Evolution; Fibroblasts; Foundations; GATA4 gene; Gene Expression Regulation; Genetic Transcription; HDAC4 gene; Histone H3; Histones; Human; Investigation; Knowledge; Mediating; Methylation; Molecular; Mus; Myocardial Infarction; Output; Phosphoric Monoester Hydrolases; Phosphorylation; Phosphotransferases; Play; Post-Transcriptional Regulation; Post-Translational Protein Processing; Process; Protein Phosphatase 2A Regulatory Subunit PR53; Proteins; Role; System; Testing; Therapeutic; Translating; Work; cardiac repair; chromatin remodeling; clinical application; clinically relevant; epigenetic regulation; histone modification; in vivo; insight; mouse model; myocyte-specific enhancer-binding-factor 2C; novel; organ growth; organ regeneration; pre-clinical; programs; tandem mass spectrometry; transcription factor

During development and evolution, cell fate changes are guided by cell’s ability to change its transcriptional program with posttranslational modifications (PTMs) on both proteins and chromatin. PTMs of histones have been extensively studied as a coding system to guide alterations in cell plasticity and cell fate, such as differentiation/programming and de-differentiation/reprogramming. The histone PTM coding system includes phosphorylation, acetylation, methylation, and ATP-dependent chromatin remodeling. In parallel, PTMs of free proteins, such as phosphorylation and acetylation of transcription factors, are also essential for organ development and cell differentiation. These PTMs in both histones and free proteins are often catalyzed by the same set of epigenetic enzymes, strongly suggesting a dynamic interplay of PTM coding between histones and epigenetic and transcription factors. However, few systematic studies have been pursued to define the functional output of PTMs as a coding system. Furthermore, the potential synergistic effect of PTMs on both histones and free factors in cell fate changes are poorly explored. Therefore, a deep understanding of the PTM code on both free proteins (ie. key cardiac transcription factors and epigenetic factors) and histones and how they work together will lead to novel insights into cell fate determination and cardiac reprogramming. Our investigation of cardiac reprogramming uncovered a unique phosphorylation code in 14-3-3 binding motifs (PC14-3-3). We hypothesize that activation of a phosphorylation code in 14-3-3 binding motifs triggers a re-arrangement of protein-protein interactome among PC14-3-3 containing reprogramming factors, epigenetic factors, and chromatin, which work synergistically in stimulating cardiac reprogramming. Specific aims: Aim 1: Identify the key factors containing PC14-3-3 essential for cardiac reprogramming. We will test the hypothesis that PC14-3-3 in key reprogramming, epigenetic and histone proteins plays a critical role in reprogramming. These studies will build a knowledge foundation of PC14-3-3 in cardiac reprogramming. Aim 2: Determine PC14-3-3 guided molecular mechanism in stimulating cardiac reprogramming. We will test the hypothesis that PC14-3-3 activation triggers a protein-protein dynamic interplay among PC14-3-3 code containing reprogramming factors (Mef2c and Gata4), epigenetic factors (Hdac4 and Brg1), and histones H3 (H3S10 and H3S28). These studies will establish PC14-3-3 directed epigenetic and chromatin landscape changes in driving cardiac reprogramming. Aim 3: Examine PC14-3-3-guided cardiac reprogramming toward therapeutic applications. We will test the hypothesis that PC14-3-3 stimulates cardiac reprogramming in human cells and clinically relevant animal models. These studies will establish the pre-clinical application of PC14-3-3 code in cardiac reprogramming and build a novel and efficient platform for reprogramming-mediated heart repair.

在发育和进化过程中，细胞命运的改变是由细胞改变其转录水平的能力所引导的。 在蛋白质和染色质上进行翻译后修饰（PTM）。组蛋白的PTM具有 作为一种编码系统被广泛研究，以指导细胞可塑性和细胞命运的改变，如 分化/编程和去分化/重编程。组蛋白PTM编码系统包括 磷酸化、乙酰化、甲基化和ATP依赖性染色质重塑。同时，免费的PTM 蛋白质，如磷酸化和乙酰化的转录因子，也是必不可少的器官， 发育和细胞分化。组蛋白和游离蛋白中的这些PTM通常由 相同的一组表观遗传酶，强烈表明组蛋白和 表观遗传和转录因子。然而，很少有系统的研究被用来定义 作为编码系统的PTM的功能输出。此外，PTM对两者的潜在协同作用 组蛋白和游离因子在细胞命运变化中的作用还不清楚。因此，深入了解PTM 两种游离蛋白质上的编码（即，关键的心脏转录因子和表观遗传因子）和组蛋白， 他们的合作将导致对细胞命运决定和心脏重编程的新见解。 我们对心脏重编程的研究揭示了14-3-3结合中独特的磷酸化密码 基序（PC 14 -3-3）。我们假设14-3-3结合基序中磷酸化密码的激活触发了一个磷酸化密码。 含有重编程因子的PC 14 -3-3中蛋白质-蛋白质相互作用组的重排，表观遗传 因子和染色质，它们在刺激心脏重编程中协同作用。具体目标： 目的1：确定包含心脏重编程所必需的PC 14 -3-3的关键因子。我们将测试 假设PC 14 -3-3在关键重编程、表观遗传和组蛋白中起关键作用， 重新编程这些研究将为PC 14 -3-3在心脏重编程中的应用奠定知识基础。 目的2：确定PC 14 -3-3介导的刺激心脏重编程的分子机制。我们 我们将检验PC 14 -3-3激活触发PC 14 -3-3之间蛋白质-蛋白质动态相互作用的假设 包含重编程因子（Mef 2c和Gata 4）、表观遗传因子（Hdac 4和Brg 1）和组蛋白的编码 H3（H3 S10和H3 S28）。这些研究将建立PC 14 -3-3指导的表观遗传和染色质景观 驱动心脏重编程的变化。 目的3：检查PC 14 -3-3引导的心脏重编程的治疗应用。我们将 测试PC 14 -3-3刺激人类细胞中的心脏重编程和临床相关性的假设 动物模型这些研究将建立PC 14 -3-3代码在心脏病中的临床前应用 重编程和建立一个新的和有效的平台，重编程介导的心脏修复。