How does the skeletal muscle communicate with the brain in health and disease?

Endocrine mechanisms have been largely associated with metabolic control and tissue cross talk in mammals. Classically, myokines comprise a class of signaling proteins released in the bloodstream by the skeletal muscle, which mediate physiological and metabolic responses in several tissues, including the brain. Recent exciting evidence suggests that myokines (e.g. cathepsin B, FNDC5/irisin, interleukin-6) act to control brain functions, including learning, memory, and mood, and may mediate the beneficial actions of physical exercise in the brain. However, the intricate mechanisms connecting peripherally released molecules to brain function are not fully understood. Accumulating findings further indicates that impaired skeletal muscle homeostasis impacts brain metabolism and physiology. Here we review recent findings that suggest that muscle-borne signals are essential for brain physiology and discuss perspectives on how these signals vary in response to exercise or muscle diseases. Understanding the complex interactions between skeletal muscle and brain may result in more effective therapeutic strategies to expand healthspan and to prevent brain disease. This article is part of the special Issue on 'Cross Talk between Periphery and the Brain'.

Automated summary

Muscle-derived signaling proteins, known as myokines, play a crucial role in regulating brain functions including learning, memory, and mood. Impaired skeletal muscle homeostasis can impact brain metabolism and physiology, highlighting the essential role of muscle-borne signals in brain health. Understanding the complex interactions between skeletal muscle and brain may lead to more effective therapeutic strategies for extending healthspan and preventing brain disease.