Video Experimental Relacionado
Updated: Jun 25, 2026
08:01
Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
Published on: May 16, 2021
AMPK regula el gasto energético mediante la modulación del metabolismo de NAD+ y la actividad de SIRT1
Carles Cantó1, Zachary Gerhart-Hines, Jerome N Feige
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, 67404 Illkirch, France.
Nature
|March 6, 2009
Resumen
La proteína quinasa activada por AMP (AMPK) regula los genes del metabolismo energético en el músculo esquelético del ratón mediante la coordinación con SIRT1.1. Esta interacción mejora la actividad de SIRT1, modulando los factores de transcripción clave involucrados en el equilibrio energético celular.
Área de la Ciencia:
- Biología molecular La biología molecular.
- Regulación del metabolismo.
- La homeostasis de energía celular es la homeostasis de la energía celular.
Sus antecedentes:
- La proteína quinasa activada por AMP (AMPK) es un sensor metabólico crucial que regula los niveles de energía celular.
- La AMPK juega un papel vital en los efectos terapéuticos de los medicamentos y el ejercicio para la diabetes tipo 2.
- La activación de AMPK promueve la producción de ATP a través de vías catabólicas e inhibe el consumo de ATP a través de vías anabólicas.
Objetivo del estudio:
- Investigar la coordinación entre AMPK y SIRT1 en la regulación de los genes del metabolismo energético en el músculo esquelético del ratón.
- Para aclarar los mecanismos moleculares por los cuales AMPK influye en la actividad de SIRT1 y los objetivos posteriores.
Principales métodos:
- Investigó cambios en la expresión génica en el músculo esquelético del ratón.
- Se evaluó la interacción y la relación funcional entre AMPK y SIRT1.
- Se analizó el impacto de la activación de AMPK en los niveles de NAD+ y la desacetilación mediada por SIRT1 de los factores de transcripción.
Principales resultados:
- AMPK controla la expresión de los genes del metabolismo energético en el músculo esquelético del ratón a través de la coordinación con SIRT1.1.
- La activación de AMPK aumenta los niveles celulares de NAD+, mejorando así la actividad de SIRT1.
- La SIRT1 inducida por AMPK mejora la desacetilación y modula la actividad de factores de transcripción como PGC-1alfa, FOXO1 y FOXO3a.
Conclusiones:
- AMPK y SIRT1 actúan en conjunto para regular la expresión génica del metabolismo energético en el músculo esquelético.
- La vía AMPK-SIRT1, a través de la desacetilación de factores clave de transcripción, explica los efectos biológicos convergentes en el metabolismo energético.
- Esta acción coordinada es fundamental para mantener el equilibrio energético celular y la salud metabólica.
Videos de Conceptos Relacionados
01:19Regulation of Metabolism
Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
01:25cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
01:30Introduction to Metabolism
Metabolism encompasses all biochemical reactions in a living organism, facilitating both the breakdown and synthesis of biomolecules. These metabolic processes are categorized into catabolic and anabolic pathways, which operate in a coordinated manner to ensure energy balance and cellular function.Catabolic Pathways and Energy ReleaseCatabolic pathways involve the breakdown of complex macromolecules such as carbohydrates, lipids, and proteins into smaller structures like monosaccharides, fatty...
01:22PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
01:30Regulation of Food Intake
Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
03:03mTOR Signaling and Cancer Progression
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...