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Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
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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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Related Experiment Video

Updated: Apr 3, 2026

Author Spotlight: Developing a Rat Model for Weight-Bearing Intervention to Investigate Osteonecrosis of the Femoral Head
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The myokine irisin increases cortical bone mass.

Graziana Colaianni1, Concetta Cuscito1, Teresa Mongelli1

  • 1Department of Basic Medical Science, Neuroscience and Sense Organs, University of Bari, 70124 Bari, Italy;

Proceedings of the National Academy of Sciences of the United States of America
|September 17, 2015
PubMed
Summary
This summary is machine-generated.

Physical activity may boost bone health through irisin, a myokine. Low-dose irisin increased bone mass and strength in mice by stimulating bone formation and reducing bone breakdown, suggesting a muscle-bone connection.

Keywords:
mechanical loadingosteoporosissarcopenia

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Area of Science:

  • Endocrinology
  • Bone Biology
  • Exercise Physiology

Background:

  • The mechanisms by which physical activity stimulates bone synthesis remain unclear.
  • Irisin, a myokine released during exercise, is a potential mediator of skeletal anabolism.

Purpose of the Study:

  • To investigate the anabolic effects of irisin on the skeleton.
  • To explore the molecular pathways involved in irisin-mediated bone formation.

Main Methods:

  • Young male mice were injected with recombinant irisin (r-irisin) at a low dose.
  • Cortical bone mass, strength, and cellular markers were analyzed.
  • Gene expression in white adipose tissue and bone marrow stromal cells was assessed.

Main Results:

  • Low-dose r-irisin significantly increased cortical bone mass and strength.
  • Irisin stimulated bone formation and reduced osteoclast numbers without affecting trabecular bone.
  • In vitro studies showed r-irisin directly stimulates osteogenesis via receptor-mediated pathways.

Conclusions:

  • Irisin exhibits anabolic actions on the skeleton, primarily through stimulating bone formation.
  • Irisin may be the molecular link between muscle activity and bone health.
  • Further research is warranted to explore irisin's therapeutic potential for bone diseases.