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Myokine – Muscle Signaling Proteins Explained

Myokines are signaling proteins released by muscle tissue during physical activity. They regulate metabolism, immune function, and inflammation throughout the body.

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Things worth knowing about "Myokine"

Myokines are signaling proteins released by muscle tissue during physical activity. They regulate metabolism, immune function, and inflammation throughout the body.

What Are Myokines?

Myokines are biologically active proteins and peptides produced and secreted by skeletal muscle cells, particularly during and after physical activity. The term is derived from the Greek words mys (muscle) and kinein (to move or activate). Myokines act as signaling molecules – similar to hormones – and exert effects on various organs and tissues throughout the body. They belong to the broader family of cytokines, which are immune-relevant messenger molecules.

Production and Release

Myokines are primarily released during physical exercise, especially endurance and resistance training. The greater the intensity and regularity of muscle use, the more myokines are produced and secreted into the bloodstream. This helps explain many of the systemic health benefits associated with regular physical activity.

Key Myokines and Their Functions

Interleukin-6 (IL-6)

IL-6 is the most extensively studied myokine. During exercise, it is released in large quantities by muscle tissue and exerts anti-inflammatory effects while also regulating metabolism. It promotes fat oxidation and improves insulin sensitivity.

Irisin

Irisin is a myokine released in response to endurance exercise. It promotes the conversion of white adipose tissue into beige adipose tissue, increasing energy expenditure and improving glucose metabolism. Potential beneficial effects on brain function and bone health are also being investigated.

BDNF (Brain-derived neurotrophic factor)

BDNF is partially produced by muscle tissue and has neuroprotective properties. It supports the growth and survival of nerve cells and may play a role in the prevention of neurodegenerative diseases.

Myostatin

Myostatin is a myokine that acts as a negative regulator of muscle growth. It limits muscle mass and serves as an important control mechanism in muscle metabolism.

FGF21 (Fibroblast Growth Factor 21)

FGF21 regulates metabolism by improving insulin sensitivity and positively influencing lipid and carbohydrate metabolism.

Relevance to Health

Myokines are central to understanding why regular physical activity confers such wide-ranging health benefits. Among their effects, myokines are known to be:

Anti-inflammatory
Metabolic regulators (improved insulin and glucose control)
Cardioprotective (heart-protective)
Neuroprotective (nerve-protective)
Osteogenic (bone-strengthening)
Supportive of immune function

Physical inactivity, on the other hand, leads to reduced myokine secretion, which may contribute to chronic low-grade inflammation and metabolic dysfunction.

Clinical Significance

Research into myokines is a rapidly growing field within sports medicine and preventive medicine. Myokines are potentially relevant in the prevention and treatment of:

Type 2 diabetes
Obesity
Cardiovascular disease
Neurodegenerative conditions (e.g., Alzheimer disease)
Osteoporosis
Chronic inflammatory diseases

In the future, individual myokines may serve as therapeutic targets or as the basis for novel drug development.

References

Pedersen BK, Febbraio MA. Muscles, exercise and obesity: skeletal muscle as a secretory organ. Nature Reviews Endocrinology. 2012;8(8):457-465.
Schnyder S, Handschin C. Skeletal muscle as an endocrine organ: PGC-1alpha, myokines and exercise. Bone. 2015;80:115-125.
World Health Organization (WHO). Global recommendations on physical activity for health. Geneva: WHO Press; 2010.

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