Ros‐mediated activation of NF‐κB and Foxo during muscle disuse

Dodd, Stephen; Gagnon, Brittany J.; Senf, Sarah M.; Hain, Brian A.; Judge, Sarah M.

doi:10.1002/mus.21526

Cited by 116 publications

(89 citation statements)

References 27 publications

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“…Interestingly, this effect was associated with a reduction of FOXO and NF-κB activation. These results have been confirmed by using antioxidant agents such as EUK-134 (SOD and catalase mimetic) [71] and SS-31 (mitochondria-targeted antioxidant) [54,121]. The inhibition of mitochondrial ROS production prevented soleus atrophy and UPS/autophagy activation induced by casting [54], whereas EUK-134 limited skeletal muscle atrophy and FOXO3a activation induced by hindlimb unloading [71].…”

Section: Evidence For a Role Of Rons In Immobilization-induced Skeletmentioning

confidence: 78%

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From physical inactivity to immobilization: Dissecting the role of oxidative stress in skeletal muscle insulin resistance and atrophy

Pierre

Appriou

Gratas-Delamarche

et al. 2016

Free Radical Biology and Medicine

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In the literature, the terms physical inactivity and immobilization are largely used as synonyms. The present review emphasizes the need to establish a clear distinction between these two situations. Physical inactivity is a behavior characterized by a lack of physical activity, whereas immobilization is a deprivation of movement for medical purpose. In agreement with these definitions, appropriate models exist to study either physical inactivity or immobilization, leading thereby to distinct conclusions. In this review, we examine the involvement of oxidative stress in skeletal muscle insulin resistance and atrophy induced by, respectively, physical inactivity and immobilization. A large body of evidence demonstrates that immobilization-induced atrophy depends on the chronic overproduction of reactive oxygen and nitrogen species (RONS). On the other hand, the involvement of RONS in physical inactivity-induced insulin resistance has not been investigated. This observation outlines the need to elucidate the mechanism by which physical inactivity promotes insulin resistance.

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Section: Evidence For a Role Of Rons In Immobilization-induced Skeletmentioning

confidence: 78%

“…In skeletal muscle of rats, catalase overexpression prevented immobilization-induced skeletal muscle atrophy [121]. Interestingly, this effect was associated with a reduction of FOXO and NF-κB activation.…”

Section: Evidence For a Role Of Rons In Immobilization-induced Skeletmentioning

confidence: 91%

From physical inactivity to immobilization: Dissecting the role of oxidative stress in skeletal muscle insulin resistance and atrophy

Pierre

Appriou

Gratas-Delamarche

et al. 2016

Free Radical Biology and Medicine

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“…We next analyzed how Actβ is induced in mitochondria-perturbed muscle. Perturbation of the mitochondrial complex I has been shown to robustly increase intracellular production of ROS (reactive oxygen species) signaling molecules and to activate various downstream kinase/transcriptional factor signaling pathways (16)(17)(18). We have also shown that complex I perturbation in the larval muscle triggers ROS production and activates transcription factors like FoxO, JNK, and NF-κB/Rel (8).…”

Section: The Ros/nf-κb Cascade Autonomously Regulates Actβ Expression Inmentioning

confidence: 87%

Activin signaling mediates muscle-to-adipose communication in a mitochondria dysfunction-associated obesity model

Song

Owusu-Ansah

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Mitochondrial dysfunction has been associated with obesity and metabolic disorders. However, whether mitochondrial perturbation in a single tissue influences mitochondrial function and metabolic status of another distal tissue remains largely unknown. We analyzed the nonautonomous role of muscular mitochondrial dysfunction in Drosophila. Surprisingly, impaired muscle mitochondrial function via complex I perturbation results in simultaneous mitochondrial dysfunction in the fat body (the fly adipose tissue) and subsequent triglyceride accumulation, the major characteristic of obesity. RNA-sequencing (RNA-seq) analysis, in the context of muscle mitochondrial dysfunction, revealed that target genes of the TGF-β signaling pathway were induced in the fat body. Strikingly, expression of the TGF-β family ligand, Activin-β (Actβ), was dramatically increased in the muscles by NF-κB/Relish (Rel) signaling in response to mitochondrial perturbation, and decreasing Actβ expression in mitochondrial-perturbed muscles rescued both the fat body mitochondrial dysfunction and obesity phenotypes. Thus, perturbation of muscle mitochondrial activity regulates mitochondrial function in the fat body nonautonomously via modulation of Activin signaling.mitochondrial synchrony | Activin-β | complex I perturbation | NF-κB/Relish | lipid metabolism I ndividual organs in a multicellular organism, besides performing their respective roles, must communicate with other organs to maintain systemic homeostasis. The central nervous system (CNS) in particular integrates information regarding the status of peripheral metabolic processes via hormonal signaling and directs energy homeostasis and feeding behavior (1). In addition, metabolic changes in a peripheral organ can affect the physiology of other peripheral organs (2, 3). The skeletal muscle system, which is newly recognized as playing endocrine-related roles, produces myokines after exercise to target other metabolic organs (liver, adipose tissue, pancreas, gut, and bone) and modulates systemic energy homeostasis (4).Mitochondria are semiautonomous organelles that integrate multiple physiological signals. Growing evidence indicates that mitochondrial alterations in one organ leads to abnormalities in biological processes in distal organs through hormonal signaling (5, 6). In addition to exercise, which induces mitochondrial activity and improves muscle performance, mitochondrial perturbationassociated muscle injury is also sufficient to modulate functions of other organs and change systemic outcomes via myokine production. For example, in mammals, mitochondrial dysfunction due to disruption of autophagic function in skeletal muscles results in elevated production of muscular FGF21 that triggers browning of white adipose tissue and increases lipid mobilization (7). Further, in Drosophila, mild mitochondrial distress in adult muscles delays aging via an increase of muscular ImpL2 production and remote suppression of insulin signaling in the fat body and brain (8). Despite these examples, molecula...

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“…During disuse, mitochondrial reactive oxygen species (ROS) production leads to mitochondrial dysfunction and muscle atrophy (71). ROS can regulate NF-B and FoxO signaling, thereby leading to the activation of atrogenes (18). Decreased sympathetic stimulation of muscle may also play a role in inactivity-related muscle wasting.…”

Section: Tgf-␤mentioning

confidence: 99%

The ubiquitin proteasome system in atrophying skeletal muscle: roles and regulation

Bilodeau

Coyne

Wing

2016

American Journal of Physiology-Cell Physiology

136

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Bilodeau PA, Coyne ES, Wing SS. The ubiquitin proteasome system in atrophying skeletal muscle: roles and regulation. Am J Physiol Cell Physiol 311: C392-C403, 2016. First published August 10, 2016; doi:10.1152/ajpcell.00125.2016.-Muscle atrophy complicates many diseases as well as aging, and its presence predicts both decreased quality of life and survival. Much work has been conducted to define the molecular mechanisms involved in maintaining protein homeostasis in muscle. To date, the ubiquitin proteasome system (UPS) has been shown to play an important role in mediating muscle wasting. In this review, we have collated the enzymes in the UPS whose roles in muscle wasting have been confirmed through loss-of-function studies. We have integrated information on their mechanisms of action to create a model of how they work together to produce muscle atrophy. These enzymes are involved in promoting myofibrillar disassembly and degradation, activation of autophagy, inhibition of myogenesis as well as in modulating the signaling pathways that control these processes. Many anabolic and catabolic signaling pathways are involved in regulating these UPS genes, but none appear to coordinately regulate a large number of these genes. A number of catabolic signaling pathways appear to instead function by inhibition of the insulin/IGF-I/protein kinase B anabolic pathway. This pathway is a critical determinant of muscle mass, since it can suppress key ubiquitin ligases and autophagy, activate protein synthesis, and promote myogenesis through its downstream mediators such as forkhead box O, mammalian target of rapamycin, and GSK3␤, respectively. Although much progress has been made, a more complete inventory of the UPS genes involved in mediating muscle atrophy, their mechanisms of action, and their regulation will be useful for identifying novel therapeutic approaches to this important clinical problem.hormones; muscle atrophy SKELETAL MUSCLE SERVES TWO essential functions, a contractile function for locomotion/maintenance of posture and a metabolic function as the protein reservoir of the body. The myofibers that make up the muscle consist primarily of myofibrillar proteins. The ability of the body to maintain posture or to move arises from the precise organization of myofibrillar proteins into a contractile unit called the sarcomere. The sarcomere consists of thick filaments containing primarily myosin that can slide over thin filaments containing primarily actin. Both types of filaments contain additional regulatory proteins and are linked to the ␣-actinin-containing Z disk, the thin filaments directly so and the thick filaments via titin. Vimentin and desmin are intermediate filaments that serve to anchor sarcomeres properly at the Z disks. These myofibrillar proteins, as well as the sarcoplasmic proteins, also serve as the protein reservoir of the body. Upon fasting, once hepatic glycogen stores are depleted, muscle protein degradation must be activated to provide amino acids to the liver for gluconeogenesis. These amino a...

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Ros‐mediated activation of NF‐κB and Foxo during muscle disuse

Cited by 116 publications

References 27 publications

From physical inactivity to immobilization: Dissecting the role of oxidative stress in skeletal muscle insulin resistance and atrophy

From physical inactivity to immobilization: Dissecting the role of oxidative stress in skeletal muscle insulin resistance and atrophy

Activin signaling mediates muscle-to-adipose communication in a mitochondria dysfunction-associated obesity model

The ubiquitin proteasome system in atrophying skeletal muscle: roles and regulation

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