Muscle as an Endocrine Organ
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Muscles secrete signaling molecules (myokines) that act on distant organs to regulate metabolism, inflammation, immune response, and brain function. This endocrine role means skeletal muscle is not just for movement and posture but is a central metabolic organ influencing whole-body health.
Core Concepts
The Problem
Many people view muscles only in terms of strength and mobility, overlooking their systemic role in inflammation, metabolic health, and ageing.
The Claim
Skeletal muscle acts as an endocrine organ by releasing myokines that communicate with tissues such as adipose tissue, liver, pancreas, immune cells, and the brain, thereby influencing disease risk and overall physiological resilience.
Key Evidence
- •Experimental studies demonstrate that muscle contraction releases hundreds of myokines, including IL-6, irisin, and myostatin, with autocrine, paracrine, and endocrine effects.
- •Epidemiological studies link low muscle mass with higher risks of metabolic syndrome, cardiovascular disease, cognitive decline, and all-cause mortality.
Practical Implication
Preserving muscle mass through exercise and nutrition is not just about function but is essential for systemic metabolic health, immune competence, and healthy ageing.
Nuance & Limits
The specific myokine profiles and their exact physiological roles are still being elucidated; not all muscle-secreted factors are beneficial, and the net effect depends on the balance of signals.
Source Material
Citation Density
Gaps
- ⚠ Need for longitudinal studies mapping myokine profiles with disease outcomes in humans
- ⚠ Clinical trials testing whether myokine-based interventions can treat metabolic or neurodegenerative conditions
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