Video Experimental Relacionado
Updated: Sep 10, 2025
08:12
Author Spotlight: Unveiling Mitochondrial Function and Cellular Metabolic Adaptation in Metabolic Diseases
Published on: October 4, 2024
1.8K
Ankyrin-B modula la fisión mitocondrial en el músculo esquelético y se requiere para una capacidad óptima de
Kayleigh M Voos1,2, Joyce Tzeng1,2, Priya Patel1
1Department of Cell and Developmental Biology, Perelman School of Medicine. University of Pennsylvania, Philadelphia, PA, USA.
Nature communications
|August 25, 2025
Resumen
La Ankyrin-B es crucial para la adaptación del músculo esquelético al ejercicio. Esta proteína promueve la fisión mitocondrial, mejorando la resistencia y el equilibrio energético bajo estrés.
Área de la Ciencia:
- Biología celular
- Fisiología del ejercicio
- Investigación metabólica
Sus antecedentes:
- La dinámica mitocondrial es esencial para la adaptación del músculo esquelético a las demandas de energía del ejercicio, el envejecimiento y los trastornos metabólicos.
- Las variantes de la proteína de andamiaje Ankyrin-B (ANK2) están relacionadas con el riesgo de síndrome cardio-metabólico.
- El papel de la anquirina-B del músculo esquelético en la dinámica mitocondrial y la capacidad de ejercicio no se comprende bien.
Objetivo del estudio:
- Investigar el papel de la anquirina-B en la modulación de la dinámica mitocondrial dentro del músculo esquelético.
- Determinar el impacto de la deficiencia de anquirina-B en la función del músculo esquelético y la bioenergética.
- Elucidar los mecanismos moleculares por los cuales la anquirina-B influye en la fisión mitocondrial y el acoplamiento sarcoplásmico entre el retículo y las mitocondrias.
Principales métodos:
- Se utilizaron ratones modificados genéticamente con deficiencia selectiva de anquirina-B en el músculo esquelético.
- Capacidad de ejercicio de resistencia, fuerza muscular y regulación sistémica de la glucosa.
- Analizó el estrés oxidativo de las fibras musculares, la oxidación de los ácidos grasos y la morfología mitocondrial (tamaño, conectividad).
- Se han investigado las interacciones de la anquirina-B con los reguladores de la fisión mitocondrial y el acoplamiento sarcoplasmático entre el retículo y las mitocondrias.
Principales resultados:
- Los ratones que carecían de ankyrin-B en el músculo esquelético mostraron una capacidad de resistencia reducida pero una fuerza muscular y una regulación de la glucosa normales.
- Las fibras musculares con deficiencia de ankyrin-B mostraron un aumento del estrés oxidativo, una disminución de la oxidación de los ácidos grasos y mitocondrias hiperconectadas agrandadas.
- Se encontró que la Ankyrin-B es esencial para reclutar moduladores de fisión a las mitocondrias y para el acoplamiento adecuado del retículo sarcoplásmico y las mitocondrias.
Conclusiones:
- Ankyrin-B juega un papel crítico en la capacidad del músculo esquelético para adaptarse al estrés energético mediante la regulación de la fisión mitocondrial.
- La vía ankyrin-B es vital para mantener la adaptabilidad del sustrato y la homeostasis bioenergética durante el ejercicio.
- La deficiencia de Ankyrin-B perjudica la capacidad de ejercicio debido a la dinámica y función mitocondriales alteradas.
Videos de Conceptos Relacionados
01:48ATP Synthase: Mechanism
15.1K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
15.1K
01:37Mitochondria
14.9K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
14.9K
01:19Translocation of Proteins into the Mitochondria
3.2K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.2K
01:27Exercise and Muscle Performance
1.6K
Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
1.6K
01:25Energy Supply for Muscle Contraction
3.7K
Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
3.7K
01:28The Inner Mitochondrial Membrane
3.6K
The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria. In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
3.6K