Video Experimental Relacionado

Updated: Jul 3, 2026

LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring

LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring

Published on: November 17, 2018

Akt/PKB regula el metabolismo hepático mediante la inhibición directa del coactivador de transcripción PGC-1alpha

Xinghai Li¹, Bobby Monks, Qingyuan Ge

¹Institute for Diabetes, Obesity and Metabolism, Cox Institute, University of Pennsylvania School of Medicine and the Howard Hughes Medical Institute, Philadelphia, Pennsylvania 19104, USA.

|June 8, 2007

Resumen

La resistencia a la insulina en la diabetes tipo 2 afecta el metabolismo de los lípidos. Este estudio revela cómo la insulina, a través de Akt2, inhibe el PGC-1alfa, controlando la síntesis de lípidos en el hígado y ofreciendo un nuevo objetivo terapéutico.

Área de la Ciencia:

La regulación metabólica en la diabetes tipo 2
El metabolismo lipídico hepático.
Las vías de señalización de la insulina.

Sus antecedentes:

La diabetes mellitus tipo 2 (DMT2) interrumpe el metabolismo de los lípidos y los carbohidratos, lo que conlleva cargas significativas para la salud y la economía.
En la DMT2, el hígado paradójicamente mantiene una alta producción de lípidos a pesar de la resistencia a la insulina a la supresión de la glucosa.
La distribución lipídica desordenada en la DMT2 contribuye a las enfermedades cardiovasculares, la principal causa de mortalidad.

Objetivo del estudio:

Para dilucidar las vías precisas de transducción de señales que rigen la regulación de la insulina de la síntesis y degradación de lípidos hepáticos.
Identificar los mecanismos moleculares que subyacen al control de la insulina sobre el metabolismo hepático en el contexto de la DMT2.

Principales métodos:

Investigó el papel de la proteína quinasa Akt2 / proteína quinasa B (PKB) -beta en la señalización de la insulina.
Se examinó la fosforilación e inhibición del receptor-coactivador 1alfa activado por el proliferador peroxisomático (PGC-1alpha) por la insulina.
Evaluó el impacto de la fosforilación alfa de PGC-1 en su reclutamiento a promotores de genes y su regulación de la gluconeogénesis y la oxidación de ácidos grasos.

Principales resultados:

Se identificó un mecanismo por el cual la insulina, a través de Akt2/PKB-beta, fosforila e inhibe el coactivador transcripcional PGC-1alpha.
Se ha demostrado que esta fosforilación impide que el PGC-1alfa se una a sus promotores de genes diana.
Se demostró que el reclutamiento alterado de PGC-1alpha obstaculiza su capacidad para estimular la gluconeogénesis y la oxidación de ácidos grasos en el hígado.

Conclusiones:

Se ha definido un nuevo mecanismo por el cual la insulina controla el catabolismo de los lípidos hepáticos.
La inhibición mediada por Akt2 establecida de PGC-1alfa como un paso regulador clave en el metabolismo hepático.
Sugiere PGC-1alpha como un objetivo terapéutico potencial para el manejo de los trastornos lipídicos en la diabetes mellitus tipo 2.

Más Videos Relacionados

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro

Published on: March 17, 2023

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway

Published on: August 23, 2024

Videos de Conceptos Relacionados

Cell Specific Gene Expression

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...

GPCR Desensitization

GPCR Desensitization

G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...

GPCRs Regulate Adenylyl Cylase Activity

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...

cAMP-dependent Protein Kinase Pathways

cAMP-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,...

Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion

Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion

Drug metabolism, a critical process in the liver, involves two primary phases: Phase I reactions and Phase II conjugation. Obesity introduces significant alterations in this metabolic process, primarily due to fatty infiltration of the liver, leading to conditions such as nonalcoholic fatty liver disease (NAFLD). This condition can modify the activities of both Phase I and II enzymes, impacting how drugs are metabolized in obese patients.Phase I metabolism sees variable effects across...

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...