胰岛素对心脏β-氧化和酸盐脱酶的相互调节
Abdallah Elnwasany1, Heba A Ewida2, Ivan Menendez-Montes1
1Division of Cardiology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
胰岛素通过抑制脂肪酸分解来激活心脏葡萄糖的氧化. 这一过程涉及马洛尼尔-CoA和乙-CoA核糖酶,为治疗心脏病提供了标.
科学领域:
- 心血管生理学心血管生理学
- 代谢调节 代谢调节 代谢调节
- 分子心脏病学分子心脏病学
背景情况:
- 心脏利用脂肪酸和葡萄糖作为能量,胰岛素调节这种平衡.
- 胰岛素抵抗和代谢灵活性受损有助于心血管疾病.
- 了解胰岛素对心脏基质利用的调节至关重要.
研究的目的:
- 调查体内证据,即胰岛素刺激心脏的酸盐脱酶 (PDH) 活性.
- 为了确定胰岛素驱动的PDH激活是否通过抑制脂肪酸氧化来介导.
- 探索乙-CoA 炭酶 (ACC) 和马洛尼尔-CoA 在这种途径中的作用.
主要方法:
- 在小鼠体内注射胰岛素.
- 测量心脏PDH脱和激活的情况.
- 量化马洛尼尔-甲酸的含量.
- 评估卡尼丁棕转移酶1 (CPT1) 活性.
- 药物抑制和心脏ACC的遗传淘汰.
- 对心脏新陈代谢每日时间变化的分析.
主要成果:
- 在小鼠中,胰岛素的使用导致心脏PDH脱和激活.
- 胰岛素增加了心脏马洛尼尔-CoA,通过CPT1.1抑制脂肪酸进口.
- 抑制CPT1模仿了胰岛素对PDH激活的影响.
- 心脏ACC的抑制或淘汰会抑制胰岛素诱导的马洛尼尔-CoA的产生和PDH的激活.
- 胰岛素和心脏葡萄糖利用的每日节律与ACC依赖的PDH活性有关.
结论:
- 胰岛素通过ACC-马洛尼尔-CoA通路抑制脂肪酸氧化,从而激活心脏PDH.
- 这种相互调节促进了心脏葡萄糖的利用.
- 这些发现确定了心脏病中代谢功能障碍的潜在治疗点.
更多相关视频
08:01Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
Published on: May 16, 2021
08:22Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion
Published on: March 20, 2017
相关概念视频
Hormones Regulating Blood Glucose
In addition to accelerating glucose uptake and utilization, insulin has...
Insulin: The Receptor and Signaling Pathways
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
Insulin and C-peptide are...
Glucose Homeostasis: Regulation of Blood Glucose
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
Cell Specific Gene Expression
What is Glycolysis?
Cells make energy by breaking down macromolecules. Cellular respiration is the biochemical process that converts "food energy" (from the chemical bonds of macromolecules) into chemical energy in the form of adenosine triphosphate (ATP). The first step of this tightly regulated and intricate process is glycolysis. The word glycolysis originates from the Latin glyco (sugar) and lysis (breakdown). Glycolysis serves two main intracellular functions: generating ATP and generating...
