Dominic Stone
Myostatin is a growth and differentiation factor-8 (GDF-8) cytokine primarily expressed and secreted in skeletal muscles. It is a key negative regulator of skeletal muscle growth. Myostatin deficiency or inhibition leads to excessive muscle growth, also known as myostatin-related muscle hypertrophy. This condition is characterised by reduced body fat and increased muscle size and strength. However, it is important to note that myostatin inhibition does not directly increase the strength of individual muscle fibres and may even decrease muscle quality. Research into myostatin and its potential therapeutic applications, especially in treating muscle-wasting diseases, is ongoing.
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What You'll Learn
Myostatin deficiency increases muscle mass
Myostatin is a growth and differentiation factor-8 (GDF-8) cytokine that is primarily expressed and secreted in skeletal muscles. It acts as a negative regulator of muscle mass, meaning it normally restrains muscle growth, ensuring that muscles do not grow too large.
Myostatin deficiency or inhibition has been shown to increase muscle mass. In 1997, geneticists Se-Jin Lee and Alexandra McPherron discovered the gene encoding myostatin and produced a knockout strain of mice that lack the gene. These mice, subsequently named "mighty mice", had approximately twice as much muscle as normal mice. Similarly, people with mutations in both copies of the myostatin gene (inaccurately called the "Hercules gene") have significantly more muscle mass and are stronger than normal. A German boy diagnosed with this condition in 2004 was considerably stronger than his peers.
In addition to humans, naturally occurring myostatin deficiencies have been identified in some breeds of cattle, sheep, whippets, and other species. For example, Belgian Blue bovines with a mutation that inhibits myostatin production exhibit a dramatic increase in muscle mass. However, they also experience dystocia due to the unusually heavy and bulky offspring.
Research has also shown that resistance exercise training (RT) and essential amino acids (EAAs) can amplify the increase in muscle mass induced by myostatin inhibition. RT, in particular, has been found to increase muscle mass above that induced by myostatin inhibitors alone.
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Myostatin inhibitors improve athletic performance
Myostatin is a growth and differentiation factor-8 (GDF-8) cytokine that is primarily expressed and secreted in skeletal muscles. It is a negative regulator of muscle mass. Myostatin inhibitors can improve athletic performance by allowing for greater muscle growth and faster recovery, giving athletes a potential advantage. This can lead to improved strength, power, and endurance.
The link between myostatin and athletic performance has sparked ethical debates, particularly around fairness and the integrity of competition. Allowing myostatin inhibitors may give some athletes an unfair advantage, challenging the principles of fair play. This has led to concerns about the abuse of myostatin inhibitors in sports, with the World Anti-Doping Agency (WADA) specifically banning them.
Research has shown that decreasing myostatin levels or inhibiting its function can increase muscle size. Studies in mice have demonstrated that myostatin inhibition increases muscle mass but decreases muscle quality (i.e., strength relative to muscle mass). Resistance exercise training (RT) and essential amino acids (EAAs) can synergistically increase muscle mass and improve muscle quality.
Naturally modulating myostatin levels through regular resistance training, a balanced diet, and certain supplements can be a safer way to enhance muscle growth and athletic performance while mitigating potential health risks associated with myostatin inhibition, such as cardiovascular strain and joint stress.
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Myostatin mutations affect muscle strength
Myostatin is a growth and differentiation factor-8 (GDF-8) cytokine primarily expressed and secreted in skeletal muscles. It acts as a negative regulator of muscle mass. Myostatin-related muscle hypertrophy is a rare condition characterised by reduced body fat and increased muscle size.
Myostatin mutations do more than just affect muscle mass; they also have variable effects on other phenotypes for different species. For example, a Belgian Blue bovine with a mutation that inhibits myostatin production will exhibit a dramatic increase in muscle mass but will also lead to dystocia. Other species with myostatin deficiency mutations, such as humans or Whippet dogs, do not experience obstructed labour.
In humans, individuals with mutations in both copies of the myostatin gene (inaccurately called the "Hercules gene") have significantly more muscle mass and are stronger than normal. People with a mutation in one copy of the MSTN gene in each cell (heterozygotes) have increased muscle bulk to a lesser degree. In 2004, a German boy was diagnosed with a mutation in both copies of the myostatin-producing gene, making him considerably stronger than his peers. An American boy born in 2005 had a similar condition, but his body produced a normal level of functional myostatin. However, a defect in his myostatin receptors prevented his muscle cells from responding normally, and he appeared on the television show "World's Strongest Toddler".
Research in mice suggests that myostatin inhibition does not directly increase the strength of individual muscle fibres. However, myostatin inhibitors can improve athletic performance, and there is concern about potential abuse in sports. Myostatin inhibitors are specifically banned by the World Anti-Doping Agency (WADA).
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Myostatin's role in muscle wasting
Myostatin is a growth and differentiation factor-8 (GDF-8) cytokine primarily expressed and secreted in skeletal muscles. It is a negative regulator of muscle mass. Myostatin inhibitors can improve athletic performance and are, therefore, a concern for abuse in sports. Myostatin expression is decreased in physically active individuals, while obesity is linked to higher levels of myostatin.
Myostatin plays a central role in the regulation of muscle weight, and its upregulation has been observed in the pathogenesis of muscle wasting during cachexia associated with different diseases. Cachexia is a clinical condition characterised by a progressive loss of muscle mass and fat that can increase morbidity, including contributing to insulin resistance, diabetes, and obesity. Myostatin/activin binding to the receptor also reduces AKT activity and, consequently, diminishes FOXO phosphorylation. Dephosphorylated FOXO enters the nucleus to activate transcription of atrophy-specific E3 ligases, which cause muscle protein ubiquitination and degradation by the proteasome.
Myostatin is also associated with muscle wasting in heart failure. Research has shown an increase in myostatin levels in the failing heart, and myostatin produced by cardiomyocytes could stimulate muscle wasting in this context. In addition, cancers that activate NF-κB or Smads may contribute to muscle wasting by raising autophagy and the breakdown of muscle proteins. Blocking the ActRIIB signalling pathway has been shown to protect against muscle wasting in various tumour-bearing mice.
Research efforts have been dedicated to developing effective therapeutics against muscle-wasting diseases by targeting the myostatin signalling pathway. The lack of myostatin promotes the growth of skeletal muscle, and blockade of its activity has been proposed as a treatment for various muscle-wasting disorders. Studies in mice have shown that myostatin inhibition increases muscle mass but decreases muscle quality (i.e. strength relative to muscle mass). Resistance exercise training (RT) and essential amino acids (EAAs) are potent anabolic stimuli that can synergistically increase muscle mass and improve muscle quality.
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Myostatin's impact on muscle regeneration
Myostatin is a growth and differentiation factor-8 (GDF-8) cytokine primarily expressed and secreted in skeletal muscles. It is a negative regulator of muscle growth, determining both muscle fibre number and size. Myostatin is highly conserved across species, from zebrafish to humans.
Myostatin has been shown to play a role in muscle regeneration, with studies indicating improved muscle regeneration in the absence of myostatin. For example, mdx mice, which are known for their cycles of degeneration, exhibit improved muscle regeneration and decreased fibrosis when myostatin is inhibited. Similarly, studies on aged mice have shown that blocking myostatin function enhances muscle regeneration after injury and during sarcopenia. In addition, myostatin has been implicated in the regulation of satellite cell activation and the migration of myoblasts and macrophages to the site of injury.
The mechanism by which myostatin regulates muscle regeneration is not yet fully understood. However, it is known that myostatin inhibits the Wnt/β-catenin pathway, which is involved in bone formation and regeneration. Myostatin is also associated with muscle wasting, and its inhibition has been proposed as a potential treatment for muscle-wasting disorders such as muscular dystrophy.
While a lack of myostatin leads to excessive muscle growth, it is also associated with impaired force generation. This paradoxical effect suggests that the increase in muscle mass is not accompanied by a proportionate increase in muscle strength. Inhibition of myostatin can also decrease muscle quality by reducing mitochondrial biogenesis and muscle protein turnover. Therefore, while myostatin inhibition may lead to increased muscle mass, it is important to consider the potential trade-off in muscle strength and quality.
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Frequently asked questions
No, more myostatin does not increase muscles. Myostatin is a growth and differentiation factor-8 (GDF-8) cytokine primarily expressed and secreted in skeletal muscles. It acts as a negative regulator of muscle mass, limiting muscle growth and promoting protein breakdown.
Myostatin deficiency or inhibition leads to excessive muscle growth, also known as myostatin-related muscle hypertrophy. This condition is characterised by reduced body fat and increased muscle size and strength. However, it is important to note that myostatin inhibition does not directly increase the strength of individual muscle fibres and may even impair force generation.
Yes, studies into myostatin may have therapeutic applications in treating muscle-wasting diseases such as muscular dystrophy and counteracting muscle weakness. Additionally, myostatin inhibition could potentially benefit the livestock industry by increasing muscle mass in animals.
