Myokine Communication Fidelity refers to the accuracy and effectiveness of the paracrine and endocrine signaling mediated by myokines, which are small peptide hormones released by contracting skeletal muscle fibers. High fidelity indicates that the myokine signal—which targets distant organs like the liver, pancreas, adipose tissue, and brain—is accurately received and translated into the intended physiological response, such as improved insulin sensitivity or reduced systemic inflammation. Maintaining this fidelity is crucial for realizing the systemic health benefits of regular physical activity.
Origin
The term originated in the field of exercise endocrinology, following the groundbreaking discovery that muscle tissue functions as an endocrine organ, coining the term ‘myokine’ (muscle-derived cytokine). The concept of fidelity was introduced to address the clinical observation that the beneficial effects of exercise can be diminished in states of chronic inflammation or metabolic dysfunction, suggesting a breakdown in the myokine-mediated cross-talk between muscle and other tissues.
Mechanism
Myokine signaling begins with muscle contraction, which triggers the expression and release of various peptides, including Interleukin-6 (IL-6), irisin, and myostatin. These myokines travel through the circulation to bind to specific receptors on target cells. For instance, irisin is hypothesized to promote the browning of white adipose tissue. Communication fidelity depends on the proper density and sensitivity of these distant receptors, as well as the absence of excessive inflammatory background noise, which can desensitize tissues to the myokines’ beneficial metabolic and anti-inflammatory signals.
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