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MECHANISMS OF METABOLIC REGULATION BY DIETARY METHIONINE RESTRICTION

饮食蛋氨酸限制的代谢调节机制

基本信息

批准号：
8686834
负责人：
Thomas W Gettys
金额：
$ 32.19万
依托单位：
LSU PENNINGTON BIOMEDICAL RESEARCH CTR
依托单位国家：
美国
项目类别：
财政年份：
2012
资助国家：
美国
起止时间：
2012-07-01 至 2016-06-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8686834
关键词：
Address Adipose tissue Affect Age Animal Model Behavioral Biochemical Biological Biological Markers Cell Line Cells Chronic Clinic Comorbidity Complement Coupled Data Development Diabetes Mellitus Diet Diet Modification Disease Essential Amino Acids Event Failure Fatty acid glycerol esters Glutathione Glutathione Metabolism Pathway Goals Health Heart Diseases Hepatic Human In Vitro Individual Insulin Insulin Resistance Letters Leucine Link Lipids Liver Mediating Metabolic Metabolic Diseases Metabolic syndrome Methionine Modeling Mouse Strains Mus Obesity Peripheral Phase Phenotype Physiological Plasma Procedures Protein Kinase Protein Tyrosine Phosphatase Proteins Publishing Rattus Regulation Research Rodent Role Series Severities Signal Transduction Specificity Stroke System Testing Tissues Transfer RNA Aminoacylation Translating Translations Work base detection of nutrient effective therapy efficacy testing energy balance glucose production improved in vivo insight insulin sensitivity insulin signaling lipid metabolism loss of function oxidation preclinical study programs response

项目摘要

DESCRIPTION: Dietary methionine restriction (MR) produces a highly integrated series of biochemical and physiological responses that reduce adiposity, improve biomarkers of metabolic health and enhance insulin sensitivity. Our data make a compelling case that dietary MR acts through both centrally-mediated effects on energy balance, and direct effects on peripheral tissues that remodel lipid metabolism and enhance insulin sensitivity. We hypothesize that sensing of dietary MR is coupled to these responses through a combination of essential amino acid- dependent signaling and methionine-specific effects on cell glutathione which serve to enhance insulin signaling. We will use a combination of in vivo metabolic phenotyping and ex vivo biochemical analysis with loss of function animal models to examine the role of essential amino acid sensing in the respective responses to dietary MR. These studies will be complemented by a two-pronged in vivo and in vitro approach to establish the specificity of restricting dietary methionine versus other essential amino acids. The goal of this work is to identify the nutrient sensing and signaling systems which detect the restriction of methionine and translate this dietary modification into a highly integrated and beneficial set of physiological responses. The significant unanswered question addressed by this proposal is whether and how restriction of methionine provides significant additional benefits compared to restriction other essential amino acids.

描述：饮食蛋氨酸限制(MR)产生一系列高度集成的生化和生理反应，以减少肥胖，改善代谢健康的生物标记物，并增强胰岛素敏感性。我们的数据提供了一个令人信服的案例，即饮食MR既通过对能量平衡的中枢调节作用，也通过对周围组织的直接作用来重塑脂肪代谢和增强胰岛素敏感性。我们假设，对饮食MR的感知是通过必要的氨基酸依赖信号和蛋氨酸对细胞谷胱甘肽的特异性作用的组合来耦合到这些反应中的，这有助于增强胰岛素信号。我们将使用体内代谢表型和体外生化分析与功能丧失动物模型相结合的方法来检验必需氨基酸感应在各自对膳食MR的反应中的作用。这些研究将通过体内和体外双管齐下的方法来建立限制膳食蛋氨酸相对于其他必需氨基酸的特异性。这项工作的目标是确定检测蛋氨酸限制的营养感知和信号系统，并将这种饮食改变转化为一套高度整合和有益的生理反应。这项提案解决的一个重大悬而未决的问题是，与限制其他必需氨基酸相比，限制蛋氨酸是否以及如何提供显著的额外好处。