Video Experimental Relacionado

Updated: May 12, 2026

Detection and Analysis of DNA Damage in Mouse Skeletal Muscle In Situ Using the TUNEL Method

Detection and Analysis of DNA Damage in Mouse Skeletal Muscle In Situ Using the TUNEL Method

Published on: December 16, 2014

Las anomalías mitocondriales en la insuficiencia cardíaca inducida por el factor de necrosis tumoral alfa están

Y Y Li¹, D Chen, S C Watkins

¹Cardiovascular Institute, Center for Biological Imaging, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.

|November 14, 2001

Resumen

La reducción de la actividad de reparación del ADN mitocondrial contribuye a la insuficiencia cardíaca en ratones con sobreexpresión de TNF-alfa. Esto sugiere que el TNF-alfa puede mediar el daño cardíaco a través de la disfunción mitocondrial y las mutaciones del ADN.

Área de la Ciencia:

Biología Cardiovascular Biología Cardiovascular
La medicina mitocondrial es la medicina de las mitocondrias.
Cardiología Molecular Cardiología Molecular

Sus antecedentes:

Las mutaciones del ADN mitocondrial cardíaco (ADNmt) están implicadas en la cardiomiopatía dilatada.
Los mecanismos que regulan las mutaciones del ADNmt cardíaco son en gran parte desconocidos.
La sobreexpresión del factor de necrosis tumoral alfa (TNF-alfa) induce insuficiencia cardíaca en ratones.

Objetivo del estudio:

Investigar los mecanismos de reparación del ADNmt cardíaco, el daño y la estructura/función mitocondrial.
Elucidar el papel del TNF-alfa en las alteraciones mitocondriales cardíacas.
Determinar el vínculo entre el TNF-alfa, las mutaciones del ADNmt y la patogénesis de la insuficiencia cardíaca.

Principales métodos:

Actividad de reparación de ADNmt evaluada (mtUDG, reparación por escisión de la base).
Daño cuantificado del ADNmt utilizando la digestión de proteínas Fpg y Southern blot.
Examinó la ultrastructura mitocondrial a través de la microscopía electrónica.
Función mitocondrial medida (citocromo c oxidasa, succinato deshidrogenasa) y contenido de ATP.

Principales resultados:

Reducción significativa de las actividades de reparación de la escisión mtUDG y de la base en el corazón de ratón TNF1.6.
Aumento de los sitios sensibles a Fpg en el ADNmt cardíaco, lo que indica un daño elevado del ADNmt.
Marcadamente reducida actividad de la citocromo c oxidasa cardíaca y morfología mitocondrial alterada.
Se observó un cambio de la fosforilación oxidativa a la glucólisis (aumento de la LDH, ALT, relación lactato/piruvato).

Conclusiones:

La reducción de la actividad de reparación del ADNmt se asocia con mutaciones del ADNmt y disfunción mitocondrial en la insuficiencia cardíaca inducida por el TNF-alfa.
Los efectos perjudiciales del TNF-alfa en el corazón pueden implicar cambios estructurales y funcionales mitocondriales.
La deficiencia de reparación del ADNmt podría ser un factor clave en la patología cardíaca mediada por el TNF-alfa.

Más Videos Relacionados

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle

Published on: January 19, 2017

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Published on: March 17, 2023

Videos de Conceptos Relacionados

Nucleotide Excision Repair

Nucleotide Excision Repair

Electron Transport Chain: Complex I and II

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...

Nucleotide Excision Repair

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...

Pathophysiology of Heart Failure

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...

Cellular Injury IV: Necrosis

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...