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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Osteoclasts in Bone Remodeling01:31

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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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Hormones and Bone Tissue01:17

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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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Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
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The Bone Matrix01:18

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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Bone Disorders01:29

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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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Role of Vitamins in Maintaining Bone Health01:25

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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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Neuronal Control of Bone Remodeling.

Alexander Corr1,2, James Smith1,2, Paul Baldock1,3,4

  • 11 The Division of Bone Biology, Garvan Institute of Medical Research, Sydney, New South Wales, Australia.

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The brain centrally regulates bone mass through nutrient-sensing pathways in the hypothalamus. Leptin deficiency and neuropeptide pathways reveal the skeleton's endocrine role and brain-bone communication.

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Area of Science:

  • Neuroendocrinology
  • Skeletal Biology
  • Metabolic Homeostasis

Background:

  • The brain is a known regulator of peripheral tissue homeostasis.
  • Central regulation of bone mass is an emerging and dynamic research area.
  • Understanding brain-bone communication is crucial for metabolic health.

Purpose of the Study:

  • To review the current understanding of central regulation of the skeleton.
  • To explore key pathways linking the brain to bone.
  • To discuss implications in both mouse models and clinical settings.

Main Methods:

  • Examination of skeletal responses to nutrient regulatory pathways in the hypothalamus.
  • Analysis of bone phenotypes in conditions like leptin deficiency.
  • Investigating neuropeptide pathways influencing bone cell activity and energy homeostasis.

Main Results:

  • Nutrient regulatory pathways in the hypothalamus are key to central bone regulation.
  • Leptin deficiency and other pathway modulations induce significant bone phenotypes.
  • Identified central neuropeptide pathways link energy homeostasis to bone cell activity.

Conclusions:

  • The skeleton functions as an endocrine organ with complex cross-talk with other systems.
  • Neural control of bone has fundamentally shifted our understanding of skeletal relationships.
  • Brain-bone axis research offers novel insights into bone, fat, and glucose homeostasis.