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Related Concept Videos

Bone as Supporting Connective Tissue01:23

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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
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Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts—...
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The connective tissues play a significant role in arranging the muscle fibers into a hierarchical structure that forms a complete muscle. Consider a muscle like the bicep brachii, commonly called the bicep. This muscle comprises thousands of muscle fibers enclosed by a protective layer of connective tissue called the endomysium. The endomysium is primarily composed of reticular fibers, a type of thin collagen fiber. It allows the exchange of nutrients and waste products at the fiber level,...
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Introduction to the Skeletal System01:20

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The skeletal system is the central framework of the body, consisting of different connective tissues: bones, cartilage, tendons, and ligaments.
Components of the Skeletal System
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Skeletal Muscle Anatomy00:55

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Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
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Spongy Bone01:09

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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
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The human body has three types of muscle tissue: skeletal, smooth, and cardiac. Each class has unique properties that enable them to perform specific functions. However, all muscle tissues share certain properties, including elasticity, contractility, and excitability. 
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Muscle and bone, two interconnected tissues.

Camille Tagliaferri1, Yohann Wittrant2, Marie-Jeanne Davicco2

  • 1INRA, UMR 1019, Unité de Nutrition Humaine, CRNH Auvergne, Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Clermont-Ferrand, France; Lesieur, 29 quai Aulagnier, 92665 Asnières-sur-Seine cedex, France.

Ageing Research Reviews
|March 26, 2015
PubMed
Summary

The bone-muscle unit is crucial for movement and autonomy throughout life. Understanding their communication can lead to combined treatments for age-related bone loss (osteoporosis) and muscle wasting (sarcopenia).

Keywords:
BoneCrosstalkLocomotor systemMuscle

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Area of Science:

  • Biomedical Science
  • Skeletal Biology
  • Exercise Physiology

Background:

  • The concept of a "bone-muscle unit" highlights the interdependence of skeletal and muscle tissues for locomotion and autonomy.
  • Evidence from various conditions like space flight, bed rest, osteoporosis, and sarcopenia supports this integrated view.
  • Mechanical loading and physical activity are key regulators of this bone-muscle interaction.

Purpose of the Study:

  • To review the molecular crosstalk between bone and skeletal muscle.
  • To identify signaling molecules (secretomes) involved in bone-muscle communication.
  • To explore potential therapeutic strategies targeting the bone-muscle unit for age-related diseases.

Main Methods:

  • Literature review of studies investigating the bone-muscle unit.
  • Analysis of molecular signaling pathways between bone and muscle tissues.
  • Identification of secreted factors (e.g., hormones, cytokines) from muscle and bone cells.

Main Results:

  • Skeletal muscle secretes factors like insulin-like growth factor-1 (IGF-1) and interleukin-6 (IL-6) that influence bone metabolism.
  • Bone-derived factors (osteokines) such as prostaglandin E2 (PGE2), Wnt3a, osteocalcin (OCN), and sclerostin may impact muscle cells.
  • Other tissues like cartilage and adipose tissue also contribute to this regulatory loop through secreted factors.

Conclusions:

  • The bone-muscle unit is a complex system with bidirectional communication.
  • Targeting this integrated system offers promising avenues for simultaneous prevention and treatment of osteoporosis and sarcopenia.
  • Nutritional interventions and physical exercise are key strategies to maintain bone-muscle health.